Device for speed control of ac voltage

 

(57) Abstract:

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. A device for controlling AC voltage includes 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 connected to the output of the summing resistor. The proposed device allows to increase the reliability of the device by IP is it fast relay switches or to use the device - controller at higher frequency controlled AC voltage that is a technical result. 4 C.p. f-crystals, 3 ill.

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.

A device for speed control of AC voltage (discrete Executive body of the AC voltage regulators), containing the input and output pins, the transformer having a primary winding connected to the input pin, and the partitioned winding decrease and/or increase voltage, the tap of which is connected to the corresponding inputs of managed switches whose outputs are combined and connected to the output (see Milovzorov VP Discrete stabilizers and conditioners voltage. M.: Energoatomizdat, 1986, S. 14, Fig. 1.6).

A disadvantage of the known device is its low reliability, due to the fact that managed switches, due to the finite time of switching, especially at high values of the switched currents and voltages, when it is necessary to use powerful commutat and low instantaneous values of current, and perform switching at high instantaneous values of current. The result is a burning and sticking of the working relay contacts, normally used as switches, which leads to abnormal modes of regulation and failure of the device as a whole.

The objective of the invention is to improve the reliability of the device.

The technical result is to reduce the load on the managed switch and increase their life span.

This result is achieved in that in a device for controlling AC voltage, comprising 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, entered operated 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 W is denim and output pins on the device, and the other winding connected to the output of summing divider.

In addition:

the first transformer is made in the form of autotransformer;

- summarizing the divider is made in the form of autotransformer;

- managed switches made on the basis of the relay;

the first and second keys made on the basis of contactless semiconductor elements.

The invention is illustrated with drawings, where Fig.1 shows a structural diagram of the device of Fig.2 - summing divider, made in the form of autotransformer of Fig.3 is an embodiment of a group of switches.

A device for controlling AC voltage (Fig.1) includes input 1 and output 2 conclusions, the first 3 transformer with 4 main winding connected to the input 1 to the output device, the partitioned winding 5 of lowering and/or raising the voltage taps 6, which are connected to the inputs of managed switches 7 of the first group of 8 switches, the outputs of which are combined, managed switches 9 of the second group of 10 switches, the inputs of which are connected to the taps 6 partitioned winding of the first transformer, and outputs the United summarizing the divider 11, the first and W is the Torah 10 groups of switches, respectively, and the second transformer 14, one of the windings 15 which is connected between input 1 and output 2 terminals on the unit, and the other winding 16 of the transformer 14 is connected to the output of the adder divider 11.

A device for controlling AC voltage is as follows. Input voltage pin 1 is input to the primary winding 4 of the first transformer 3. On the 6 taps of the winding 5 is formed by the series of values of the alternating voltage. One or two values from a formed on the taps 6 are fed through the keys 12 and 13 to the inputs of adder divider 11, the output of which is formed by the average value between the voltages corresponding to the respective taps. The switches 7 and 9 are the keys, or two or more input switches (Fig.3), which are connected and controlled in such a way that at any point in time to the outputs of the respective group of 8 or 10 are connected to only one of the taps, i.e., the winding section 5 is not bridged, and the first and second summing inputs of the divider 11 is served or two values from adjacent taps (during switching voltage), or one value with the same tap. From the output of summing divider 11 AC voltage is supplied to the coil 16 transformtest with an input voltage supplied to the output 2 of the device.

In the set mode, the first and second summing inputs of the divider 11 is connected to the same tap. To change the output voltage, and process of regulation, the device enters the mode switching, which served the appropriate control action (for example, in the form of a digital signal or code) on the control inputs of the switches 7 or 9. However before changing the control code is opened corresponding to the given group of key switches 12 or 13. Unlocking is carried out on a half-cycle of alternating voltage, i.e., for network frequency AC 50 Hz key 12 or 13 will remain open for 10 MS from the passage of current through zero until the next transition. During this time, is the status of managed switches corresponding group of switches in accordance with the Manager changed the code so that the toggle switch is in open circuit, which greatly facilitates the operation mode switches. Then in the same way there is a change in the other group of switches.

When performing a summation of the divider in the form of an autotransformer (Fig.2) on the exhaust mid-point of the last forms the first and second summing inputs of the divider, the voltage at the output UOwill be equal to UO= (UWH+UWH)/2.

The maximum voltage between the inputs of the adder divider 11 is limited by the difference between the voltages of the neighboring taps and switching circuit of the first and second inputs of the adder divider occurs sequentially in time. Thus, the maximum change in output voltage during switching is possible only within half the difference of the voltage between the taps.

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

Using as keys 12 and 13 of contactless semiconductor elements such as transistors, thyristors or triacs, provides an operational shutdown of the desired circuit on a given half-cycle of the sinusoidal oscillations of the regulated voltage.

The proposed device allows to increase the reliability of the device by eliminating the adverse effects from toggle switches under load, allows the use of less high-speed relays-switches or to use the device controller when blencogo voltage, including 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, characterized in that it introduced operated 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.

2. The device according to p. 1, wherein the first transformer is made in the form of an autotransformer.

3. Device according to any one of p. 1 or 2, characterized in that summarizes the divider is made in the form of an autotransformer.

4. Device according to any one of paragraphs.1, 2, or 3, characterized in that the controllable switches is performed on cos the us-based contactless semiconductor elements.

 

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FIELD: electric engineering.

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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