Step-by-step ac voltage regulation device

FIELD: electrical engineering; fast-response and high-precision ac voltage regulators.

SUBSTANCE: proposed ac voltage regulation device has input and output leads; common point; first transformer that has main winding connected between input lead and common point of device and sectionalized winding whose taps are connected to respective inputs of controlled switch; second transformer whose secondary winding is connected between input and output leads of device; controlled phase shifter interconnecting second transformer primary winding, controlled switch output, and common point; first transformer functions to step up voltage by minimum two times of its regulation range and second transformer is used to accordingly step down this voltage.

EFFECT: reduced value of handled currents.

5 cl, 2 dwg

 

The invention relates to the field of electrical engineering and can be used for voltage regulation, in particular, in precise, high-speed stabilizers AC voltage.

The closest in technical essence of the prototype is a device for speed control of AC voltage containing the input and output pins, a first transformer having a primary winding connected to the input output device and the partitioned winding decrease and/or increase voltage, the tap of which is connected to the corresponding inputs of the controllable switches of the first group of switches, managed switches of the second group of switches, the inputs of which are connected to the respective taps of the partitioned winding of the first transformer, summarizing the divider, the first and the second input of which is connected through the first and second keys, respectively, to the outputs of managed switches the first and second groups of switches, respectively, and a second transformer, one winding of which is included between the input and output pins of the device, and the other winding to the output of the adder divider (see RF patent №2188496 to the invention the Device for speed control of AC voltage on CL H 02 M 5/12, G 05 F 1/30, publ 27.08.2002,, bull. No. 24).

The disadvantage of the local device is its complexity, due to the presence of a large number of powerful switches, at least two for each tap, designed for switching currents close in value to the value of the load current. Use as switches contactless semiconductor elements, which typically require installation to the heat sink, leads to a significant increase in the overall dimensions of the device. The use of relay switches, high current switching limits the frequency characteristics of the known device, so as relays for such currents have poor temporal characteristics.

In addition, excessive switching element reduces the reliability and complicates the implementation. So the parameters of each pair of switches of the first and second groups of switches must be coordinated with the failure of one of the pair of switches all current load falls on the other switch of the pair.

Object of the invention is the improvement in overall size.

The technical result is the decrease in value of the switched currents to reduce the volume of radiators or use a faster relay switches.

This result is achieved in that in a device for controlling changes the first voltage, including input and output pins, a common point, a first transformer having a primary winding connected between the input output device and a common point and the partitioned winding, a tap which is connected to the corresponding inputs of a managed switch, a second transformer, the secondary winding of which is included between the input and output pins on the device, entered controlled phase shifter through which the primary winding of the second transformer connected to the output of a managed switch, through the first input of the phase shifter and to a common point through a second input of the phase shifter, the first transformer is made increasing the voltage is not less than 2 times the value of the control range of the voltage, and the second the transformers are made in order to decrease the voltage, respectively.

In addition:

the phase shifter is made consisting of two controlled switches, the outputs are connected to respective outputs of the phase shifter, the first input of the first switch is combined with the second input of the second switch and connected to the first input of the phase shifter and the second input of the first switch is combined with the first input of the second switch and connected to the second input of the phase shifter;

the first transformer is made in the form of autotransformer;

- upravlyaemymi includes a set of controlled switches, the number of taps of the partitioned winding of the first transformer, the outputs of which are combined and connected to the output switch, and inputs connected to respective inputs of the switch;

keys managed switch is made on the basis of the relay.

The invention is explained by using the drawings, in which figure 1 shows a structural diagram of the device with the first transformer, made in the form of autotransformer, figure 2 - structural diagram of one embodiment of the voltage regulator based on the proposed device.

A device for controlling AC voltage (Figure 1) includes the input 1 and output 2 conclusions a common point 3, the first 4 transformer, made in the form of an autotransformer, with the main 5 (primary) winding connected between the input 1 output and a common point of the 3 devices, partitioned (secondary) winding of dividing the winding into sections by taps 6, which are connected to respective inputs of a managed switch 7, the output of which is connected to the first input of vozvrashhala 8. The second input of the phase shifter 8 is connected to the common point 3, and the outputs of the phase shifter 8 is connected to the inputs of the primary winding 9 of the second transformer 10, the secondary winding 11 which is connected between input 1 and output 2 terminals on the unit. The General point is a point obseg the (zero) potential, and combined with elements of the conductive part of the device.

The phase shifter 8 is made consisting of two managed switches 12 and 13, the outputs are connected to first and second outputs of the phase shifter, respectively, the first input switch 12 and the second input of the switch 13 are United and connected to the first input of the phase shifter 8, and the second input switch 12 and the first input of the switch 13 are United and connected to the second input of the phase shifter 8.

Switch 7 includes a set of managed keys 14 by the number of taps of the partitioned winding of the transformer 4, the outputs of which are combined and connected to the output of the switch 7, and the inputs to the respective inputs of the switch 7.

The input 15 of the control switches 12 and 13 of the phase shifter 8 and the control inputs 16 keys 13 of the switch 7 are used to supply a control action on the switches and keys.

To the output device connected to the load 17.

The transformer 4 and the transformer 10 is made increase and decrease voltage, respectively, with a conversion ratio of ensuring conversion of the voltage signal is not less than 2-fold relative to the control range of the voltage value of the regulated output.

The voltage regulator (Figure 2) using the proposed device to regulate the AC voltage includes a voltage input is 1 and the output pins, the first 4 and the second 10 transformers switch 7, the phase shifter 8, the decoder 18, and a reversible counter 19, the Comparators 20 and 21 of the upper and lower levels, respectively, and the measuring body 22.

A device for controlling AC voltage is as follows.

The input AC voltage is applied between the pin 1 and the total point 3. The applied voltage from pin 1 is input to the main 5 (primary) winding of the first transformer 4. The transformer 4 is increase the voltage regulation range not less than two times, i.e. between the extreme conclusions partitioned (secondary) winding of the transformer 4, namely, between the upper output (tap) and the common point of the device is formed by a voltage whose value is not less than 2 times higher than the value of the control range. On the taps 6 partitioned winding of the first transformer 4 is formed by the series of values of the alternating voltage the magnitude of which is between the value of at least twice the value of the control range, the highest output (tap) partitioned winding, and zero in the extreme lower output, combined with the common point, the partitioned winding, with a step defined regulatory objectives. Thus, if the voltage regulator is in the range from 145 In do, i.e. the control range is 125, then in the extreme conclusions of the partitioned winding, in every possible allowable input voltages, there should be a voltage not less than 250 C. When the transformation preserves the power of the converted current, so the currents are then switched by the switch 7, is reduced by the same factor, how many times increases the tension.

The switch 7 is controlled so that at any time its output is connected only with one tap of the partitioned winding, i.e. a partition of a partitioned winding is not bridged, and the inputs of the phase shifter 8 is energized only with one tap. The switches 12 and 13 of the phase shifter 8 is controlled so that its first and second outputs is formed depending on the control action, or direct voltage obtained at the output of the switch 7, or its opposite in sign to the voltage. That is, the phase shifter 8 provides discrete phase switching voltage (current)applied to the primary winding 9 of the second transformer 10 that allows you to either sum the currents induced in the secondary winding of the transformer 10 with load currents, or deduct them from the load current.

The transformer 10 is a decrease voltage not less than twice, so that increased regulatory in the custody of, formed at the output of the partitioned winding, converted into nominal regulating alternating voltage in the secondary winding 11, which, depending on the state of the phase shifter 8, is added or subtracted from the input voltage supplied to the output 2 of the device. If you have power at the voltage conversion in the first and second transformers switching of increased regulatory creates the required voltage change in the voltage on the output device.

In the set mode, the voltage output of the tap partitioned winding is fed through the switch 7 and the phase shifter 8 to the primary winding of the second transformer, creating the desired change in output voltage. To change the output voltage, which is provided, in the regulatory process, in moments of transition switched current through zero, served the appropriate control action (for example, in the form of a digital signal or code) on the control inputs of the switch 7. This opens closed before and closes the other corresponding to the job, the key switch 7, by changing the regulating voltage. The result is changed and the output voltage of the device. To change the voltage in the opposite direction, also at the moment of transition of the switching current through zero, is control the abuser impact on the control inputs of the phase shifter 8, changing the direction of current flow in the primary winding of the second transformer and as a result of changing the output voltage of the device at the load 17.

The first transformer can provide galvanic isolation of input and output devices, or to be made in the form of autotransformer.

The voltage regulator is made on the basis of the proposed device for speed control of AC voltage, operates as follows.

In the set mode, when the output of the stabilizer is present nominal (specified) voltage, which is between the maximum and minimum values of the reference voltages of the Comparators 20 and 21, respectively, the digital code generated at the output of the reversible counter 19 and converted by a decoder 18 provides the status of the key elements of the switch 7 and the phase shifter 8 corresponding to the nominal voltage at the output.

When changing the output voltage, for example due to a change in load resistance, it is immediately determined by measuring body 22 and at some point it may be above the maximum or below the minimum reference voltages that will change the state of the Comparators 20 or 21, respectively. Reversible counter will begin to change the value of the digits of the first output code in the direction of increase or decrease depending on the state of the Comparators. The modified digital code output of the counter 19 via the decoder 18 will help change the status of key elements of the switch 7 and the phase shifter 8, providing a decrease or increase the output voltage, respectively, until the moment when the output voltage close to the nominal and will be within the specified maximum and minimum reference voltages, respectively.

Due to the reduction in the proposed device the magnitude of the switched currents at least 2 times, it has become possible to reduce the size requirements of the radiators used contactless semiconductor elements such as transistors, thyristors or triacs, which allowed to reduce the weight and size parameters of the device as a whole.

At the same time a reduction in the switched currents allowed to use as a switching element and keys fast types of relay switches, which could not be used because of the need to commute large value of currents. For example, if the regulated load current of the device is 24 And when the control range of the voltage 125, the proposed device is sufficient to provide switching current values of all 12 And under voltage 250 C. as a key switch in this case, you can IP altoviti, for example, relay type 835 firm Song CHUAN, allowing to obtain acceptable performance characteristics switching time - no more than 5 MS, while the mechanical life of the device is quite acceptable, and is 107. Use of the relay leads to lower mass and size parameters by excluding radiators, since the relay there is no forward voltage drop and the need in the radiator is missing. Using the conversion factors of the first transformer, corresponding to greater than 2 times the increase in voltage, relative to the value range of the regulation voltage, allows you to translate the process of commutation in the region even lower currents, which, in turn, allows the use of more high-speed relay switches for a given load current.

Introduction the phase shifter provides the ability to use the same section of the first transformer and the key switch to the same value but different in sign regulating voltage, i.e. to reduce the number of keys in two times in comparison with the prototype.

The use of the proposed device allows also to reduce the weight and size parameters of transformers, due to the fact that the winding corresponding to the switched currents, wound wire of much smaller cross section.

Thus, proposed is my device provides reduced weight and size characteristics of the device compared to the prototype due to the transfer process switching in the range of lower currents and consequently reducing the volume of used radiators for contactless semiconductor switching element or exclusion of radiators in the case of high-speed relays.

1. A device for controlling AC voltage, comprising input and output pins, a common point, a first transformer having a primary winding connected between the input output device and a common point and the partitioned winding, a tap which is connected to the corresponding inputs of a managed switch, a second transformer, the secondary winding of which is included between the input and output pins on the device, characterized in that it introduced a controlled phase shifter through which the primary winding of the second transformer connected to the output of a managed switch through the first input of the phase shifter and to a common point via the second input of the phase shifter, the first transformer is made increasing the voltage is not less than 2 times the value of the control range of the voltage, and the second transformer are made in order to decrease the voltage, respectively.

2. The device according to claim 1, characterized in that the phase shifter is made consisting of two controlled switches, the outputs are connected to respective outputs of the phase shifter, the first input of the first switch is combined with the second input of the second switch and p is dglucan to the first input of the phase shifter, and the second input of the first switch is combined with the first input of the second switch and connected to the second input of the phase shifter.

3. Device according to any one of claim 1 or 2, characterized in that the first transformer is made in the form of an autotransformer.

4. The device according to any one of claims 1 and 2 or 3, characterized in that the controlled switch includes a set of managed keys on the number of taps of the partitioned winding of the first transformer, the outputs of which are combined and connected to the output switch, and inputs connected to respective inputs of the switch.

5. Device according to any one of claims 1 to 3 or 4, characterized in that the keys managed switch is made on the basis of the relay.



 

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FIELD: electrical engineering; fast-response and high-precision ac voltage regulators.

SUBSTANCE: proposed ac voltage regulation device has input and output leads; common point; first transformer that has main winding connected between input lead and common point of device and sectionalized winding whose taps are connected to respective inputs of controlled switch; second transformer whose secondary winding is connected between input and output leads of device; controlled phase shifter interconnecting second transformer primary winding, controlled switch output, and common point; first transformer functions to step up voltage by minimum two times of its regulation range and second transformer is used to accordingly step down this voltage.

EFFECT: reduced value of handled currents.

5 cl, 2 dwg

FIELD: electrical engineering; variable-voltage regulating devices.

SUBSTANCE: proposed variable-voltage stepping regulator whose output voltage is much higher (by 1.5 times or more) than input value is designed to maintain output voltage within desired (usually as short as, for instance, ±1%) with input voltage varying within much wider range (±10%) has input and output leads, main step-down or step-up transformer or autotransformer, tap changer of this transformer primary winding, and booster transformer whose primary winding is connected through its one lead to tap changer and secondary winding is connected to first input lead; one of main-transformer primary winding leads is connected to second input lead; tap changer functions to connect booster transformer primary winding to entire primary winding of main transformer or to its part; booster transformer primary winding is inserted between first input lead and primary winding of main transformer; second lead of booster-transformer primary winding is also connected to tap changer whose switching algorithm implies connection of booster-transformer primary winding to entire main-transformer primary winding and to its part both in phase and in phase opposition with respect to input voltage, as well as its shorting out.

EFFECT: simplified design, reduced mass, size, and cost, enlarged functional capabilities of regulator.

1 cl, 2 dwg

FIELD: physics.

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EFFECT: improved adjustment regularity of industrial power network with distorted voltage type.

5 dwg

Voltage regulator // 2346318

FIELD: electricity.

SUBSTANCE: voltage regulator model proposed is an invention referring to the sphere of electrical engineering. Device contains input and output terminals, a sensor of input main voltage and a transformer, the latter's primary coil connected to the first diagonal of a bridge circuit composed of four normally open adjustable alternating current switches; the transformer secondary coil is serially connected to the load circuit with an adjustable alternating current switch connected parallel to it. The control alternating current switches are controlled via three-position comparator units. There are time delay elements inserted in the "more" and "less" control output signals circuit of the three-position comparator unit that enable synchronisation of the transformer primary coil connection and secondary coil bridging with the upper and the lower voltage setup units connected to the "Higher Voltage" and the "Lower Voltage" outputs of the three-position comparator unit accordingly.

EFFECT: simplification of design combined with extension of functional capabilities, minimisation of weight and overall dimensions, rejection of noise generated by the device and maintenance of the consumer end voltage harmonicity under major supply voltage fluctuations.

1 dwg

FIELD: electricity.

SUBSTANCE: improved efficiency of method implementation is achieved due to multi-phase system balancing against specified phase, or phase with load current close to mean current, or less loaded phase defined as reference phase. By the method, balancing is implemented by generation of pre-formed currents by means of additional power source in each of remaining (n-1) phases, so that in each balanced (n-1) phase of the main n-phase network, the geometrical sum of currents generated in balanced phase and with load current is equal modulo to current in reference phase, and angle formed by the current of reference phase and total current of balanced phase following the reference phase at forward sequence of phases, as well as between total currents of neighbouring (n-1) balanced phases is equal to electrical degrees.

EFFECT: improved efficiency of multi-phase system balancing due to increased response and simplified implementation, extended application sphere, improved economy.

1 dwg

FIELD: electricity.

SUBSTANCE: invention may be used to control or stabilise voltage of power and converting transformers, in particular for supply of individual loads in networks with unstable parametres. It is proposed to control voltage alternately in zones of current and voltage match and non-match. Besides voltage should be reduced first in zones of current and voltage signs match by increasing switching angle and second in zones of current and voltage signs non-match by reducing switching angle, and pressure increase shall be executed in reverse order.

EFFECT: expanded range of control in case of active-inductive, active-capacitance and recuperative loads, and in idle running of transformer.

3 dwg

FIELD: electricity.

SUBSTANCE: diagram transmits the amplified resonant power generated in winding of common transformer, when subsequent or parallel resonance of common electric power supply has been formed, to the load through common transformer. Diagram includes the following: electric power supply to generate and supply voltage or current; power amplifier to generate amplified resonant power by using voltage or current; and power transmission module to transmit the amplified resonant power to load by using the transformer.

EFFECT: improving the quantity of electric power supplied to the load.

4 cl, 15 dwg, 3 tbl

FIELD: electricity.

SUBSTANCE: form of consumed current may also differ from current consumed by load, which makes it possible to use the method not only for control of value and correction of AC voltage form, but also for correction of load capacity coefficient. Device to realise method of AC voltage control includes noise-suppression capacitor (C1), integrating throttle (L), commutator K for two positions, noise-suppression capacitors (C2, C3) and autotransformer with sectional winding (AT), besides, input voltage is sent to one output of integrating throttle and noise-suppression capacitor (C1), the second output of integrating throttle is connected to input of commutator (K), output (1) AT (winding start) is connected to common wire of device and point of connection of noise-suppression capacitors (C1-C3), output of section (2), which determines minimum input voltage, is connected to the first output of commutator (K) and the second output of noise-suppression capacitor (C2), output of section (3), which determines maximum input voltage, is connected to the second output of commutator (K) and the second output of noise-suppression capacitor (C3), and output voltage is taken from output (4) AT.

EFFECT: provides for smooth control in wide range of input voltage variation with the possibility to correct form of input voltage with device simplification.

3 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: grid-controlled inverter of single-phase alternating current includes transformer having primary winding connected to supply voltage source; secondary winding made in the form of three in-series connected sections with outputs from each of them, and four chains, each of which includes pair of in-series connected controlled valves parallel connected to each other and anode inverter buses. Extreme points of chains are connected by means of those buses to in-series connected smoothing coil, generator and ballast resistor, and middle points are connected to the appropriate outputs of sections of secondary transformer winding. In order to achieve the effect, non-controlled valve - diode, which is connected through cathode to anode bus, and through anode to cathode bus of inverter, is also introduced. Use of invention allows increasing power factor in nominal mode in all control zones from 0.7 to 0.84. Besides, average value of rectified voltage of inverter increases per each half-period in control zones 1, 2, 3, 4, and thus, electric energy flow of generator to mains increases by 15%.

EFFECT: improving power factor in nominal mode in control zones 2, 3, 4 owing to decreasing margin angle δ, which is specified by decrease of commutating angle of large circuit γ, at maintaining voltage regulation in those zones in wide range, and in the first zone due to decrease of margin angle δ, which is specified by decrease of commutating angle γ.

6 dwg

FIELD: electricity.

SUBSTANCE: in the method to supply to electrotechnical appliances with application of an AC voltage generator by means of voltage transfer from the generator to the low-voltage winding of a high-frequency transformer, electric energy to the low-voltage winding of the high-frequency transformer is sent via a unit from two high-frequency generators via a unit of capacitors serially connected with generators with a differences of frequencies Δ=f1-2, where f1 - frequency of the first generator, f2 - frequency of the second generator, f1. makes 1-100 kHz, and Δ=0.01-0.1f1, and a part of electric energy from the high-voltage winding is sent via a unit of the feedback voltage converter to generators supplying their low-voltage winding. In the device for supply of electrotechnical appliances comprising a source of AC voltage with a controlled frequency, a high-frequency transformer, the device comprises two high-frequency generators, outputs of which via capacitors are connected in series with the low-voltage winding of the high-frequency transformer and has an additional fifth capacitor, which is connected in parallel with the low-voltage winding, the high-voltage winding of the high-frequency transformer is connected with an electrotechnical appliance and via the voltage converter is connected with inputs of two high-frequency generators.

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2 cl, 1 dwg

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