The ac voltage stabilizer (options)

 

(57) Abstract:

The invention can be used to power electrical equipment, communication systems, automation and remote control, lighting networks. The technical result consists in the simplification of the power of the device, improving reliability, electromagnetic compatibility. The invention consists in that the AC voltage stabilizer, containing a transformer and a switching unit, put a current limiting resistor and parallel to it, break contact of the intermediate element, parallel to the primary winding of said transformer switched capacitor, the comparator and the control is designed in the form of two identical circuits control the outputs are connected to the auxiliary power source, the input of which is connected to the phase and zero wires, the scheme of control and management. Dan three-phase embodiment of the stabilizer, AC voltage using an additional intermediate elements and circuits and control, applied in single-phase version, as well as variants of one-way restrictions. 2 S. and 3 C.p. f-crystals, 6 ill.

the Russian equipment, communication systems, automation and remote control, lighting networks.

Known stabilizers AC voltage with nonlinear elements, which serves as a serial or parallel resonant circuit containing a saturated inductor and capacitor, also known thyristor voltage regulators that contain the keys, the comparison circuit and control [1].

However, the output voltage of such stabilizers is a distorted form, contains higher harmonics. In addition, such stabilizers have low Massabielle characteristics.

Also known stabilizers with stepped output waveform containing the power transformer, switching device, the comparison circuit and control [2] . In the main part of the power transmitted to the load as unregulated, and the portion of the adjustment by means of thyristors. In fact, such a stabilizer close to the limiter voltage. However, it distorts the shape of the output voltage due to the phase regulation during each half-cycle of the line voltage.

Also known stabilizer AC voltage containing power transformers included secondary sravnenie and management, bridge device [3]. The main disadvantages of this device are multiple transformers, nonoptimality of management, significant weight and size characteristics.

Closest to the proposed device is the stabilizer AC voltage [4], which contains a transformer, the primary winding through which a switching unit connected to the leads for connection of the input voltage and the secondary winding is connected between terminals for connecting a load, four bridge circuits, transformer control, power key, key management and decoupling capacitor, the switching unit includes two pairs of switching elements, each of breaking and closing of the switching element, the comparator and control that contains the comparison circuit and the gain stabilizer circuit control level and control level, the primary winding of the transformer is connected to the common conclusions of the pairs of switching elements, a control circuit that provides two voltage divider, two comparator, direct and inverted inputs of which is connected through a current limiting resistor to the middle points of the above-mentioned voltage dividers, the second inputs comparethem level control, the outputs of the Comparators through a third pair of limiting resistors connected to the inputs of the keys of the control level, in the output circuits of which are connected in series with the LEDs and the windings of the respective switching elements.

The main disadvantages of such stabilizer are powerful switching key, additional transformer control, significant switching currents in the process, which affects the reliability of the switching elements, and electromagnetic compatibility of the entire device as a whole, the presence of linearly-key mode.

The aim of the invention is the simplification of the power of the device, the improvement of the characteristics of its reliability, electromagnetic compatibility.

The proposed device has the following configuration options: 1st option - limit voltage "from above", i.e., increasing, or "bottom", i.e., with its lower; 2nd option - limitation of voltage "top" and "bottom", i.e., as when raising and lowering.

This objective is achieved in that the AC voltage stabilizer, containing a transformer, the primary winding whose voltage and the secondary winding is connected in the load circuit, the comparator and the control switching unit is made in the form of breaking and closing of the contacts, the primary winding of the transformer connected in parallel to the secondary directly and through normally closed contact in parallel bounding resistor between zero wire and make contact, enabled break contact of the third relay is parallel to the primary winding of said transformer switched capacitor, the comparator and the control executed in the control circuit and that controls the increase or decrease of the load voltage from a prescribed level, the input of which is connected to the output of the auxiliary source connected to the phase and zero wires, the output of the above mentioned control circuit and the control is connected to a switching relay that controls the above-mentioned breaking and closing the contacts of the switching unit, to the phase and zero wires connected to the first intermediate relay in the circuit which is normally open contact of the switching relay, a second relay in the circuit which is normally open contact of the first relay.

The second option is the AC voltage stabilizer, containing a transformer, the primary winding of which through the switching block containing the switching elements connected to the leads for connection of the input voltage, the comparator and control, characterized in that the switching unit is made in the form of two ends and two NC contacts, the primary winding of the transformer connected in parallel to the secondary through normally closed contacts, in series with which is included closing the contacts, the same conclusions which are connected, in parallel bounding resistor between zero wire and closing contacts included normally open contact of the third relay, parallel to the primary winding of uponanother control, controlling the increase or decrease of the load voltage from a prescribed level, the inputs of which are connected to the output of the auxiliary power source, the input of which is connected to the phase and zero wires, the outputs of the mentioned schemes control is connected to the first and second switching relays that control the above-mentioned breaking and closing elements of the switching block phase and zero wires connected to the first intermediate relay in the circuit which are connected in series normally open and normally closed contacts of the first and second switching relay, a second relay in the circuit which are connected in series normally open and normally closed contact of the second and first switching relay, the third intermediate relay in the circuit which is normally open contact of the second relay and in parallel enabled him contact of the first relay.

As in the first embodiment, the comparator and the control is designed in the form of two schemes of control, each of which contains two voltage divider consisting of two series-connected resistors connected to the common anode stabil ednea point of the first voltage divider through the first limiting resistor connected to the direct input of the first comparator, an inverse input of which is connected to the middle point of the first divider level, connected to the output of the auxiliary power source, the midpoint of the second voltage divider is connected via a second limiting resistor to the inverted input of the second comparator, a direct input of which is connected to the middle point of the second divider between the output of each of Comparators and its direct input is in series connected resistor and diode, determine the width of the hysteresis of the respective comparator, the output of each of the said first and second Comparators connected unit delay enable and disable containing connected in series limiting resistor and a capacitor, in parallel bounding resistor included a chain of serially connected resistor and diode, and the anode of the diode is connected to one output of the above-mentioned capacitor, the other output of which is connected to a common point, the direct inputs of the third and fourth Comparators are interconnected and connected to the middle point of the third voltage divider connected to the output of the auxiliary power source, the inverse inputs of the third and fourth Comparators connected to cockatiel and fourth Comparators connected to the trigger inputs on the second and third element 2I, included cross under the scheme RS flip-flop inverted output of the third element 2I IS NOT connected to the fourth element 2I IS NOT, the output of the fourth comparator between the potential output of the auxiliary power source connected to the node initial installation, containing the RC circuit to the midpoint of which is connected to the input of the first element 2, the output of which is connected to the cathode of the first diode, the anode of which is connected to the connection point of the second input of the trigger and the first resistor, the other terminal connected to the output of the fourth comparator, the output of the fourth element 2I-NOT connected resistive divider, the midpoint of which is connected to the input transistor, the emitter of which is connected to a common point in the circuit of the collector is connected in series connected second resistor and the light emitter of the optocoupler, the photodetector which is included in the control circuit, in series with the third and fourth limiting resistors, a control thyristor, the anode and the cathode of which is connected to the second output of the bridge circuit in the input circuit which includes a switching relay connected in circuit single-phase alternating current, the connection point of the photodetector and the fourth limiting resistor but introduced is connected to the other two phases of the network two transformers and two of the switching unit, similarly, the United first phase to phase voltage, i.e., between any phase and zero wire is connected to the fourth, fifth, sixth and seventh intermediate relay, the circuit of the fourth relay is enabled break contact of the second relay, normally open contact of the fourth relay is included in the circuit of the fifth intermediate relay, normally open contact of the fifth relay included in the circuit of the third intermediate relay, normally open contact of the first relay included in the circuit of the sixth intermediate relay, normally open contact which is included in the circuit of the seventh intermediate relay, normally open contact which is connected in parallel to the contact of the fifth relay.

In Fig. 1-6 depict a diagram of the proposed device. In Fig. 1-4, 6 is the first variant of Fig. 3, 4-6 second option. The first option is a stabilizer, voltage-limiting "on top" or "bottom" and "top" and "bottom". The term "above" means that the line voltage is increased and a decrease in the load, the concept of "bottom - voltage decreased and the increase of the load; the "bottom" and "top" - the work comes within the specified range given the device, structural diagram of which is shown in Fig. 1 and Fig. 2. In Fig. 1 the secondary winding of the transformer 1 is connected in series with the load, the switching unit includes a normally closed contact 4 and the normally open contact 5, the same conclusions primary and secondary windings of the transformer 1 are interconnected and connected to the phase wire, the latter findings mentioned windings are connected through the normally closed contact 4, the point of connection of NC contact 4 and the primary winding of the transformer 1, shunted by a capacitor 1', connected to one of the conclusions closing of the contact 5, the second terminal of which is connected to the connection point of the limiting resistor 19 and closing of the contact 20 of the second intermediate relay 13, second, the conclusions of which are interconnected and connected to the ground wire.

In Fig. 2 the secondary winding of the transformer 1 is connected in series with the load, connected to the same conclusions through the break contact 2, which forms together with NC contact 3 of the switching unit, to the primary winding shunted by a capacitor 1', transformer 1, the second findings of the primary and secondary windings of said transformer 1 are connected, one living contact 2, the other end to the connection point of the limiting resistor 19 and closing of the contact 20 of the second intermediate relay 13, the latter findings are interconnected and connected to the ground wire.

In Fig. 1, 2 the first switching relay 6 (7) connected respectively to the phase voltage in series with the outputs of the control circuit and control 8 (9), the input control circuit and control 8 (9) connected to the output of the auxiliary power source 10, the input of which is connected to the phase voltage of the network, the first (11, 12) and the second relay is connected to the phase voltage, in series with the element 11 included the break contact 14 of the switching relay 6 and closing the switching contact 15 of the relay 7, similarly connected in series with the element 12 NC pin 16 of the switching relay 6 and a locking pin 17 of the switching relay 7, in series in the circuit of the second relay 13 is connected in parallel trailing contacts 18 and 18' of the elements 11 and 12.

In Fig. 3 presents a diagram of the control that determines the amount of increase or decrease voltage and its control, resulting in turning on or off switching elements (contactile two schemes control for single-phase stabilizers and three devices comparison and control for three-phase stabilizers. The Zener diode 24 connected cathode to the potential output of the auxiliary power source 10, together with the resistors 25, 26, 27, 28, connected in series (25 and 26) and (27 and 28) in two parallel branches, form two voltage divider: the first of the elements 24, 25, 26, the second of the elements 24, 27, 28, and the first divider is initiated by top-level, second - bottom. Divisors of resistors 29, 30 and 31, 32 are first and second divisors level, i.e., the reference voltage dividers, resistors 30 and 31 connected to one output potential to the internal bus stabilized source, the second pins to the resistors 29 and 32, the other terminals of which are connected to a common point.

Midpoints of the first and second voltage dividers connected respectively through limiting resistors 33 and 34 to the direct input of the first comparator 35 and the inverted input of the second comparator 36, an inverse input of the first comparator is connected to the middle point of the first divider level, direct input of the second comparator to the midpoint of the second divider level between the outputs of the first and second Comparators and their direct inputs connected respectively two chains of serially connected resistor and diode, Stour 39 and diode 40. These circuits determine the width of the hysteresis Comparators 35, 36, the output of each of the Comparators is connected to the delay circuit to enable and disable the next two Comparators, the first delay circuit includes series-connected RC circuit of resistor 41 and capacitor 42 in parallel to the resistor 41 included a chain of serially connected resistor 43 and diode 44.

Moreover, the anode of the diode is connected to the connection point between the resistor 41 and capacitor 42, the other output of which is connected to a common point. Similarly combines the elements of the second delay circuit that contains a resistor 45, a capacitor 46, resistor 47 and diode 48, the connection point of the elements 42 and 44 are connected to the inverted input of the third comparator 49, the connection point of the elements 46 and 48 to the inverted input of the fourth comparator 50, the direct inputs of these Comparators are interconnected and connected to the middle point of the third divider level containing serially connected resistors 51 and 52, free pins which are connected respectively to the potential bus internal stable source and a common point, stable internal source, for example, contains parametric stabilizer on the Zener diode 53 with Cartago comparator 50 is connected to the node initial installation, containing the capacitor 57, a resistor 58, forming a RC-circuit, the connection point of the above-mentioned capacitor and resistor connected to the first circuit 2I-NOT 59 (based on Schmidt trigger), the output of which is connected to the cathode of the diode 60, the anode of which is connected to one terminal of the resistor 61, the other output of which is connected to the output of the fourth comparator, the output of the third comparator 49 and the connection point of the elements 60 and 61 are connected to the inputs of the trigger, for example, two elements 2I-NOT - the second and third circuits 62 and 63 United under the scheme RS-flip-flop, i.e., cross-feedback, the output of the third circuit 2I IS NOT connected to the fourth 64 (inverter), the output of which is connected to the resistive divider resistors 65 and 66, the midpoint of which is connected to the input of the transistor 67, and free of the resistor 66 to the common point of the emitter of the above-mentioned key is connected to a common point, and a collector connected in series through the light emitter thyristor optocoupler 68 and collector resistor 69 to potential output stable internal source to the cathode of the Zener diode 53.

The photodetector triac optocoupler in series with the resistors 70 and 71 is connected to the power outputs of the Executive alimentado thyristor 72, the connection point between the resistor 71 and the photodetector triac photo coupler 68 is connected to the control electrode of the element 72, the anode and cathode of each connected to the output of the second bridge circuit 73, the entrance of which is included in the circuit of AC voltage from the switching relay 6 (7). Instead of elements 2I-NOT RS-trigger inverters can be built on other elements, but in this case, the more complicated the device, as it increases the number of blocks of the IC.

Auxiliary power supply 10 includes, for example, the transformer 21, bridge rectifier 22 and a smoothing filter 23. The node 10 may be made without transformer 21 (Fig. 4), using instead quenching (capacitor, resistor, or directly straightening network with RC smoothing filter. This embodiment is possible because of the relatively low current consumption circuits and control 8, 9 (Fig. 3).

In Fig. 5 shows a diagram of the device, limiting the "top" and "bottom". It contains a transformer 1, the secondary winding of which is connected in series with the load, the switching unit containing the power switching elements 2, 3, 4, 5, 2, 4 - NC (normally closed) and 3, 5 - no (normally open), per and 4, consistently with NC elements (each of them) included closing the switching elements 3 and 5, the same conclusions which are interconnected, i.e., items 2-5 form a pattern in which between the points of connection elements 2, 3 and item 4, 5 includes the primary winding of the transformer 1, parallel to which the switched capacitor 1', and between the same terminals of the elements 2 and 4 on the secondary winding of the transformer 1, the same conclusions switching elements 3, 5 are interconnected. The connection elements 6-18 with their connections described in Fig. 1, 2.

In Fig. 5, the first switching relay 6 and the second switching relay 7 is connected respectively to the phase voltage in series with the outputs of the first and second circuits and control 8 and 9, the inputs of the circuits and control 8 and 9 connected to the output of the auxiliary power source 10, the input of which is connected to the phase voltage of the network.

First, second and third intermediate relays 11, 12, 13 connected to the phase voltage, in series with the element 11 included the break contact 14 of the first switching relay 6 and the normally open contact 15 of the second switching relay 7, similarly, the switch is, I can pay tithing switching relay, consistently in the circuit of the third intermediate relay 13 is connected in parallel trailing contacts 18 and 18' of the elements 11 and 12.

In parallel bounding resistor 19 connected between the zero wire and the connection point of the elements 3 and 5, enabled make contact 20 of the third intermediate relay 13, the latter findings are interconnected and connected to the ground wire.

Diagram of three-phase AC voltage stabilizer is shown in Fig. 6. In parentheses next to the designations of switching elements for phase A bear designations for phases B and C. the Advantage of this three-phase stabilizer is that, as in single-phase version, used only two schemes and control 8, 9. Items 11-17 similarly connected to single-phase circuits of Fig.4 and Fig. 5. Additionally, in single-phase circuit connected to the fourth intermediate relay 74, in a circuit which includes normally open contact 75 of the second intermediate relay, normally open contact 76 of the fourth intermediate relay included in the circuit of the fifth intermediate relay 77, normally open contact 78 fifth intermediate relay 77 is included in the circuit of the third intermediate relay 13.

Closing contact 79 of the first promezhutkah intermediate relay 82, normally open contact 83 which is connected in parallel to a contact 78, all intermediate relays (74, 77, 80, 82) are included in the above-mentioned single-phase circuit a, B or C. Power node for phases B and C is similar to the phase A (the elements 1, 1', 2, 3, 4, 5, 19, 20). In parentheses in Fig. 6 selected switching elements, no and NC, respectively, for phases B and C: 2 (84, 85), 3 (86, 87), 4 (88, 89), 5 (90, 91), 20 (92, 93), that means the following: in phase B instead of the switching element 2 has a switching element 84, and in the phase C - 85, etc.

When this switching element 84 is controlled by the sixth intermediate relay 80, the switching element 85 is operated by the seventh switching element 82, the switching element 86 is controlled by the sixth intermediate relay 80, the switching element 87 - seventh intermediate relay 82, the switching elements 88 and 90 are controlled by the fourth intermediate relay 74, the switching elements 89 and 91 - fifth intermediate element 77, 92, 93 third intermediate relays.

The device depicted in Fig.1 and Fig.2, are similar to Fig. 5. When the switch contacts 4 and 5, i.e. in the limit from above leads to a negative (subtractive) EMF, and switching pins 2 and 3, i.e. at the limit "from below" - to presence polioe in Fig.5, works as follows.

In the initial state, the position of the switching elements is 2-5, as shown in Fig. 5, i.e., the switching elements 2 and 4 are closed, and 3 and 5 are open. The primary and secondary windings of the transformer 1 are connected in parallel, their inductive resistance is quite low, and the supply voltage and the load is almost the same. The unit 9 controls the reduction of the load voltage, operates at lower node 8 controls the voltage at the load (carries out the work on improvement).

If the voltage is less than the set level for the switching element 7, it is disconnected from the single-phase network, his contact in the circuit of the second intermediate switch 12 is open. In this case, fairly practical equality voltage and load.

If you increase the voltage by more established level of node 9 through node 7 switching relay 7 is activated, while working elements 12 (i.e., switch contacts 4 and 5), 13 (i.e., includes the member 13, closing the contact 20).

The voltage at the load will be equal to the difference voltage and the EMF induced in a winding of the transformer 1. If the circuit voltage is decreased, the scheme in the NTA 6, that will include the elements 11 and 13 (switch contacts 2, 3) and the voltage at the load will be equal to the network plus the EMF induced in the secondary winding of the transformer 1. With increasing voltage the circuit will return to its original state. Levels of actuation and release of the elements 6 and 7 are determined by the total instability of the stabilizer. Control circuit and control 8 (9) (Fig.3) works as follows.

When enabled, the stabilizer is the charge of the capacitor 57, the input element 59 and the resistor 58, the level of the log. "1", the output element 59 the level of the log. "0". The trigger on the elements 62 and 63 is set in this state, when the output of the element 63 the level of the log. "1", and the output element 64 - log. "0", in this mode the switch on the transistor 67 is closed. Over time, defined by the elements 57, 58, closes the diode 60. Variable resistors 25 and 27 is set to the specified level enable and disable (variable resistors 37 and 39) of the switching unit. If you increase the input voltage is above the reference at the output of the comparator 35, a signal will appear log. "1", through resistor 41 is the charge of the capacitor 42. The chain of elements 43 and 44 serve to rapidly discharge capacitor 42.

When the charge of the capacitor 42 V log. "0", which puts the trigger on the elements 62, 63 in such a state that the output of the circuit 64 appears the level of the log. "1", including the key transistor 67, current flows through the light emitter thyristor optocoupler 68 contains its photothyristor (photodetector), turns on the thyristor 72 and, then, the element 6 (or 7) acting on the power switching elements 2-5.

While the concept of "intermediate element" and "relay", "switching element" and "switching of the relay, respectively, are identical and equivalent. Relay, for example, can be Electromechanical, electronic, as well as their contacts.

When the lower voltage comparator 35 is returned to its original state, through the elements 43 and 44 discharges the capacitor 42, which leads to the initial state and the comparator 49. At an even greater reduction in voltage trigger Comparators 36 and 50 are similar to the above, the trigger on the elements 62 and 63 of the switches is closed the key transistor 67, item 6 (7) turns off switching of the switching unit.

Three phase voltage stabilizer (Fig. 6) works as follows. Assuming that node 8 controls the reduction of the load voltage, and the node 9 controls the zoom is CT 15 in the circuit of the first intermediate element 11 is open, the position of the switching elements 2-5 corresponds shown in Fig. 1 (as well as the position of the closing pin 20), mains voltage and load is about the same. If you increase the voltage by more established to enable element 7 through this element actuates the first intermediate relay 11, and then the fourth intermediate relay 74, the fifth intermediate relay 77, normally open contact 20 bypasses a current limiting resistor 19, similar to the switches in the other two phases contacts, the fourth control relay 80, the fifth intermediate relay 77, closed contacts 92 and 93.

The voltage at the load will be equal to the difference voltage and the EMF induced in the windings of the low voltage (LV), i.e., the secondary windings of the transformers 1, included in each phase. If the circuit voltage is decreased, the circuit will return to its original state, i.e., the mains voltage and the load will be approximately equal.

If the voltage becomes less than the level specified for element 6, it works and will be included in the second intermediate relay 14, the sixth intermediate relay 80, the seventh intermediate relays 82 and the third intermediate relay 13, the corresponding contacts, managed KJV what about the secondary winding (LV) transformers 1 of each phase.

With increasing voltage the circuit will return to its original state. Depending on the threshold and hysteresis in each level is calculated using one or another factor of stabilization of the stabilizer.

A current limiting resistor 19 in conjunction with the element 20 greatly improves the operation mode of the switching elements 2-5, increases longevity, improves the mode of operation of the above elements as voltage and current. To "soften" the transition process is and the capacitor 1'. In addition, in the absence of the above-mentioned capacitor and a limiting resistor EMF winding high-voltage (HV), i.e. the primary winding in saturation of the transformer is pronounced sawtoothed nature and may exceed the current value several times (when the network 220 / 380V can reach 1 - 1,2 kV).

The authors tested layout 1 kW, 10 kW and 50 kW with an estimated total instability of output voltage 5% and 10%. For e-node Fig.3 was used operational amplifiers 1401 UDB as Comparators, type IC-1561 TLL (or LA7), type thyristor optocoupler SO-G (or B, In two sequentially), type thyristor COA. For the variant of the transformer 1 NN - 12V, BH - 220, i.e., K= 18 the earticlewas 99,45%. Using the proposed device power saving 10% to 20%.

Thus, the proposed two variants of the stabilizer, AC voltage, limiting the value of "top" and "top" and "bottom"; the "bottom" and "top" and "bottom". Suggested devices have several advantages compared with the known stabilizers AC voltage. The above data confirm the possibility of implementation of the present invention. At the same time, offer options of AC voltage stabilizers are working on any kind of load without distortion of the voltage curve. Switching occurs without interrupting the current and the currents To less than the current load.

Sources of information

1. Power supply CEA. The Handbook. Edited, S. of Naivelt. M.: Radio and communication, 1986, S. 254, Fig. 7.4.

2. Power supply CEA. The Handbook. Edited, S. of Naivelt. M. : Radio and communication, 1986, S. 264, Fig.7.9.

3. Auth. mon. USSR N 534742, G 05 F 1/30. The stabilizer AC voltage. / M. B. Lozin, V. C. Petrov, O. H. the Seyfullin and other Publ. 1976, bull. N 41.

4. RF patent N 2100837, G 05 F 1/30, M 02 M 5/12. The stabilizer AC voltage. / L. Z. F. the ATOR, the primary winding of which through the switching block containing the switching elements connected to the leads for connection of the input voltage and the secondary winding is connected in the load circuit, the comparator and control, characterized in that the switching unit is made in the form of breaking and closing of the contacts, the primary winding of the transformer connected in parallel to the secondary directly and through normally closed contact in parallel bounding resistor between zero wire and make contact, enabled break contact of the third relay is parallel to the primary winding of said transformer switched capacitor, the comparator and the control is designed in the form of a scheme of control and management, controlling the increase or decrease of the load voltage from a prescribed level, the input of which is connected to the output of the auxiliary source connected to the phase and zero wire, the output of the above-mentioned control circuit and the control is connected to a switching relay that controls the above-mentioned breaking and closing the contacts of the switching unit, to the phase and zero wire connected to the first intermediate relay, nahoditsya normally open contact of the first relay.

2. The device under item 1, characterized in that the comparator and the control is designed in the form of two schemes of control, each of which contains two voltage divider consisting of two series-connected resistors connected to the common anode of the Zener diode, the cathode of which is connected to the potential output of the auxiliary power source, the midpoint of the first voltage divider through the first limiting resistor connected to the direct input of the first comparator inverted input of which is connected to the middle point of the first divider level, connected to the output of the auxiliary power source, the midpoint of the second voltage divider is connected via a second limiting resistor to the inverted input of the second comparator, a direct input of which is connected to the middle point of the second divider between the output of each of Comparators and its direct input is in series connected resistor and diode, determine the width of the hysteresis of the respective comparator, the output of each of the said first and second Comparators connected unit delay enable and disable containing successively United restrictive Registrar and diode, moreover, the anode of the diode is connected to one output of the above-mentioned capacitor, the other output of which is connected to a common point, the direct inputs of the third and fourth Comparators are interconnected and connected to the middle point of the third voltage divider connected to the output of the auxiliary power source, the inverse inputs of the third and fourth Comparators are connected to the connection point of the anodes of diodes and capacitors of the respective nodes of the delay enable and disable the outputs of the third and fourth Comparators connected to the trigger inputs on the second and third elements 2I - NOT included cross under the scheme RS-flip-flop, inverted output of the third element 2I IS NOT connected to the fourth element 2I IS NOT, the output of the fourth comparator between the potential output of the auxiliary power source connected to the node initial installation, containing the RC circuit to the midpoint of which is connected to the input of the first element 2, the output of which is connected to the cathode of the first diode, the anode of which is connected to the connection point of the second input of the trigger and the first resistor, the other terminal connected to the output of the fourth comparator, the output of the fourth element 2I - NOT connected resistive divider, with the ETUI collector connected in series connected second resistor and the light emitter optocoupler, the photodetector which is in series with the third and fourth limiting resistors connected to the power outputs of the control thyristor, the anode and the cathode of which is connected to the second output of the bridge circuit in the input circuit which includes a switching relay connected in circuit single-phase alternating current, the connection point of the photodetector and the fourth limiting resistor connected to the control electrode of the above-mentioned thyristor.

3. The AC voltage stabilizer, containing a transformer, the primary winding of which through the switching block containing the switching elements connected to the leads for connection of the input voltage, the comparator and control, characterized in that the switching unit is made in the form of two ends and two NC contacts, the primary winding of the transformer connected in parallel to the secondary through normally closed contacts, in series with which is included closing the contacts, the same conclusions which are connected, in parallel bounding resistor between zero wire and closing contacts included normally open contact of the third relay, parallel pervi the form of two identical circuits and control, controlling the increase or decrease of the load voltage from a prescribed level, the inputs of which are connected to the output of the auxiliary power source, the input of which is connected to the phase and zero wire, the outputs of the mentioned schemes control is connected to the first and second switching relays that control the above-mentioned breaking and closing elements of the switching block phase and zero wire connected to the first intermediate relay in the circuit which are connected in series normally open and normally closed contacts of the first and second switching relay, a second relay in the circuit which are connected in series normally open and normally closed contacts of the second and first switching relay, the third intermediate relay in the circuit which is normally open contact of the second relay and in parallel enabled him contact of the first relay.

4. The device according to p. 3, characterized in that the comparator and the control contains two schemes of control, each of which contains two voltage divider consisting of two series-connected resistors connected to the anode common with the Oia, the midpoint of the first voltage divider through the first limiting resistor connected to the direct input of the first comparator inverted input of which is connected to the middle point of the first divider level, connected to the output of the auxiliary power source, the midpoint of the second voltage divider is connected via a second limiting resistor to the inverted input of the second comparator, a direct input of which is connected to the middle point of the second divider between the output of each of Comparators and its direct input is in series connected resistor and diode, determine the width of the hysteresis of the respective comparator, the output of each of the said first and second Comparators connected unit delay on and off, containing connected in series limiting resistor and capacitor in parallel bounding resistor included a chain of serially connected resistor and diode, and the anode of the diode is connected to one output of the above-mentioned capacitor, the other output of which is connected to a common point, noninverting inputs of the third and fourth Comparators are interconnected and connected to the middle point of the third divider acomparative connected to the connection point of the anodes of diodes and capacitors of the respective nodes of the delay on and off, the outputs of the third and fourth Comparators connected to the trigger inputs on the second and third elements 2I - NOT included cross under the scheme RS flip-flop inverted output of the third element 2I IS NOT connected to the fourth element 2I IS NOT, the output of the fourth comparator between the potential output of the auxiliary power source connected to the node initial installation, containing the RC circuit to the midpoint of which is connected to the input of the first element 2, the output of which is connected to the cathode of the first diode, the anode of which is connected to the connection point of the second input of the trigger and the first resistor, connected to the other output to the output of the fourth comparator, the output of the fourth element 2I IS NOT connected to the resistive divider, the midpoint of which is connected to the input transistor, the emitter of which is connected to a common point in the circuit of the collector is connected in series connected second resistor and the light emitter of the optocoupler, the photodetector which is in series with the third and fourth limiting resistors connected to the power outputs of the control thyristor, the anode and the cathode of which is connected to the second output of the bridge circuit in the input circuit which includes a switching relay, connect the Stora is connected to the control electrode of the above-mentioned thyristor.

5. Device according to any one of paragraphs.3 to 4, characterized in that additionally connected to the other two phases of the network two transformers and two of the switching unit, connected similarly to the first phase to phase voltage, i.e., between any phase and zero wire is connected to the fourth, fifth, sixth and seventh intermediate relay, the circuit of the fourth relay is enabled break contact of the second relay, normally open contact of the fourth relay is included in the circuit of the fifth intermediate relay, normally open contact of the fifth relay included in the circuit of the third intermediate relay, normally open contact of the first relay included in the circuit of the sixth intermediate relays, normally open contact which is included in the circuit of the seventh intermediate relay, normally open contact which is connected in parallel to the contact of the fifth relay.

 

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SUBSTANCE: device in each between grid and load has secondary winding of transformer, while said winding consists of two semi-windings, average point of which is connected to appropriate phase of grid, and remaining outputs are connected to load through fully controlled two-direction keys, and primary winding consisting of two semi-windings and two fully controlled one-direction keys form up two-clock high-frequency inverter and rectifier, while operation of said keys in secondary windings is synchronized with operation of said keys in primary winding in such a way that in case of fall of grid phase voltage below given level voltage of secondary winding was added to grid voltage and respectively vice versa, and value of increase was determined by displacement between operation of said keys in primary winding and keys in secondary windings.

EFFECT: lower weight, lesser dimensions.

3 dwg

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