CN214474688U

CN214474688U - Voltage regulating circuit based on controllable switch

Info

Publication number: CN214474688U
Application number: CN202120972877.2U
Authority: CN
Inventors: 袁碧波
Original assignee: Zhejiang Jingneng Power Equipment Co ltd
Current assignee: Zhejiang Jingneng Power Equipment Co ltd; Jingning Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-10-22
Anticipated expiration: 2031-05-08

Abstract

The utility model discloses a voltage regulating circuit based on a controllable switch, which comprises a thyristor component, a coil, a contactor and a control component, wherein the thyristor component comprises a thyristor; the taps of the coil comprise a head end tap, a first middle tap, a second middle tap and a tail end tap which are sequentially arranged on the coil, and the anode and the cathode of the thyristor are respectively connected with the first middle tap and the second middle tap; and the gate pole and the cathode of the thyristor are respectively connected with the anode and the cathode of the control component. The control component applies voltage to a gate pole and a cathode pole of the thyristor to enable the thyristor to be conducted, so that the voltage waveform of the coil from the first middle tap to the second middle tap is adjusted, the effective voltage value of the coil is changed, the effective voltage value between the head end and the tail end of the coil is enabled, the output voltage of the tail end is adjusted, and the voltage adjusting function is achieved.

Description

Voltage regulating circuit based on controllable switch

Technical Field

The utility model relates to a vary voltage circuit technical field, concretely relates to voltage regulating circuit based on controllable switch.

Background

Currently, voltage regulation circuits have entered various fields. The alternating voltage regulation is carried out by a transformer, a traditional voltage regulator, a power electronic converter, a switch transformer and the like. The input voltage of the electric equipment is regulated by adopting a transformer mode, the input voltage can be only converted from one voltage to another voltage, the input voltage of the transformer has great influence along with the input power grid voltage and the load, the voltage is unstable, and the method is not suitable for occasions needing to continuously regulate the input voltage.

The input voltage of the electric equipment is adjusted by adopting a voltage regulator, the input voltage is adjusted by a mechanical means, the input voltage cannot be directly controlled by electricity, the use is inconvenient, the response speed of the adjustment by the mechanical means is low, and the dynamic performance is poor. The power electronic converter can realize high-performance voltage regulation, but has high cost, complex control and low reliability.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned technical problem that exists among the prior art, the utility model provides a pressure regulating circuit based on controllable switch through thyristor assembly control coil's vary voltage performance, plays the effect of pressure regulating.

The utility model discloses a voltage regulating circuit based on a controllable switch, which comprises a thyristor component, a coil, a contactor and a control component, wherein the thyristor component comprises a thyristor; the taps of the coil comprise a head end tap, a first middle tap, a second middle tap and a tail end tap which are sequentially arranged on the coil, and the anode and the cathode of the thyristor are respectively connected with the first middle tap and the second middle tap; and the gate pole and the cathode of the thyristor are respectively connected with the anode and the cathode of the control component.

Preferably, the control assembly comprises a direct-current power supply and a control switch, wherein the anode of the direct-current power supply is connected with one end of the control switch, and the other end of the control switch is connected with the gate pole of the thyristor;

and the cathode of the direct current power supply is connected with one end of the control switch.

Preferably, the control assembly comprises a controller, and an anode of a control end of the controller is connected with a gate pole of the thyristor; and the cathode of the control end of the controller is connected with the cathode of the thyristor.

Preferably, the utility model discloses still include the bypass contactor, the both ends of bypass contactor are taken a percentage with the input of coil respectively and are connected with output tap.

Preferably, the bypass contactor is connected with the controller;

the thyristor component comprises a plurality of thyristors, and the thyristors are arranged on adjacent taps.

Preferably, the coil is a transformer coil, the tail end of the transformer coil is connected with the motor, the transformer is a three-phase transformer, the three-phase transformer comprises three coils, and a first middle tap and a second middle tap of each coil are respectively connected with the anode and the cathode of the thyristor.

Preferably, the input end of the three-phase transformer is connected with a circuit breaker, and the output end of the circuit breaker is provided with a current sensor.

Preferably, the current sensor is connected to the controller.

Preferably, the controller is of the type STM32, and the coil is an autotransformer coil.

Compared with the prior art, the beneficial effects of the utility model are that: the control component applies voltage to a gate pole and a cathode pole of the thyristor to enable the thyristor to be conducted, so that the voltage waveform of the coil from the first middle tap to the second middle tap is adjusted, the effective voltage value of the coil is changed, the effective voltage value between the head end and the tail end of the coil is enabled, the output voltage of the tail end is adjusted, and the voltage adjusting function is achieved.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention;

FIG. 2 is a schematic circuit diagram of embodiment 2;

fig. 3 is a circuit diagram of embodiment 3.

The notation in the figure is:

a T coil, a P thyristor component, a C control component, a Km bypass contactor, M power utilization equipment,

DC power supply, K control switch, 11 controller, 12 current sensor and 13 breaker.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The invention is described in further detail below with reference to the accompanying drawings:

a voltage regulating circuit based on controllable switches is disclosed, as shown in fig. 1 and fig. 2, and comprises a thyristor component P, a coil T, a contactor Km and a control component C, wherein the thyristor component P comprises one or more thyristors; the taps of the coil T comprise a head end tap, a first middle tap, a second middle tap and a tail end tap which are sequentially arranged on the coil, and the anode and the cathode of the thyristor are respectively connected with the first middle tap and the second middle tap; the gate and cathode of the thyristor are connected to the anode and cathode of the control component C, respectively.

The control component C applies voltage to a gate pole and a cathode pole of the thyristor to enable the thyristor to be conducted, so that the voltage waveform of the part from the first middle tap to the second middle tap of the coil T is adjusted, the effective voltage value of the part is changed, the effective voltage value between the head end and the tail end of the coil T is enabled, the output voltage of the tail end is adjusted, and the voltage regulating effect is achieved.

The thyristor is a PNPN four-layer three-terminal device and has three PN junctions in total. When the gate pole bears the positive voltage, the thyristor is conducted; after the thyristor is conducted, the gate pole loses the effect; with the thyristor on, the thyristor turns off when the main loop voltage (or current) decreases to approximately zero.

In one specific embodiment, the thyristor assembly comprises a plurality of thyristors, the thyristors are arranged on adjacent taps, effective voltages of the adjacent taps are controlled through different thyristors, the voltage-adjustable range is improved, namely the conduction rate of the thyristors is controlled, and the voltage at the tail end is adjusted.

Example 1

As shown in fig. 1, the control component includes a DC power supply DC and a control switch K, an anode of the DC power supply DC is connected to one end of the control switch K, and the other end of the control switch K is connected to a gate of the thyristor; the cathode of the direct current power supply is connected with one end of the control switch K. When the control switch K is closed, the direct current power supply applies forward voltage to the gate pole, and the thyristor is conducted under the condition that the head end of the coil T has an input power supply. At this time, the control switch K is closed, and the switch of the thyristor is not influenced. The control switch may thus be a time delay switch.

Example 2

The control component C comprises a controller 11, wherein the anode of the control end of the controller 11 is connected with the gate pole of the thyristor; the cathode of the control terminal of the controller 11 is connected to the cathode of the thyristor.

The control end of the controller applies voltage to the gate pole and the cathode of the thyristor, so that the gate pole receives forward voltage and the thyristor is conducted. The controller may employ an STM32 controller, but is not limited thereto.

The coil may further include a contactor Km at both ends thereof, and when the contactor Km is closed, the voltage or current between the anode and the cathode of the thyristor is made zero, thereby disconnecting the thyristor.

The control end of the contactor Km can be connected with a controller, and the switch of the contactor Km is controlled through the controller.

When voltage is applied to the head end of the coil, the controller controls the conduction of one or more thyristors, the effective voltage of the tail end of the coil is adjusted, the voltage of the tail end is gradually changed from low to high, and finally the contactor Km is closed to enable the voltage of the tail end to return to normal, so that the soft start effect is achieved. And simultaneously, the controller stops applying the voltage to the gate pole of the thyristor, so that the thyristor is disconnected. Wherein the electric equipment M is connected with the tail end of the coil T. The controller can adjust the conduction of the thyristors to carry out multi-pole voltage regulation.

Example 3

As shown in fig. 3, in the voltage regulation of the three-phase power, the coil T is a transformer coil, the tail end of the transformer coil is connected with the motor, the transformer is a three-phase transformer, the three-phase transformer includes three coils, and a first center tap and a second center tap of each coil are respectively connected with the anode and the cathode of the thyristor.

The voltage of the electric equipment M is regulated by controlling the pressure of each coil of the three-phase transformer separately.

The input end of the three-phase transformer is connected with a circuit breaker 13, the output end of the circuit breaker 13 is provided with a current sensor 12, the current sensor 12 is used for detecting the current of three-phase electricity, and the controller 11 is connected with the current sensor 12.

Wherein the coil may be a self-coupled coil.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A voltage regulating circuit based on a controllable switch is characterized by comprising a thyristor component, a coil, a contactor and a control component, wherein the thyristor component comprises a thyristor;

the taps of the coil comprise a head end tap, a first middle tap, a second middle tap and a tail end tap which are sequentially arranged on the coil,

the anode and the cathode of the thyristor are respectively connected with the first middle tap and the second middle tap;

and the gate pole and the cathode of the thyristor are respectively connected with the anode and the cathode of the control component.

2. The voltage regulating circuit according to claim 1, wherein the control component comprises a direct current power supply and a control switch, an anode of the direct current power supply is connected with one end of the control switch, and the other end of the control switch is connected with a gate pole of the thyristor;

3. The voltage regulating circuit of claim 1, wherein the control component comprises a controller, wherein an anode of a control terminal of the controller is connected with a gate of a thyristor; and the cathode of the control end of the controller is connected with the cathode of the thyristor.

4. The voltage regulating circuit according to claim 3, further comprising a bypass contactor, wherein two ends of the bypass contactor are respectively connected to an input end tap and an output end tap of the coil.

5. The voltage regulation circuit of claim 4, wherein the bypass contactor is connected to the controller;

6. The voltage regulating circuit according to claim 5, wherein the coil is a transformer coil, the tail end of the transformer coil is connected to the motor, the transformer is a three-phase transformer, the three-phase transformer comprises three coils, and a first intermediate tap and a second intermediate tap of each coil are respectively connected to the anode and the cathode of the thyristor.

7. The voltage regulating circuit according to claim 6, wherein a circuit breaker is connected to an input end of the three-phase transformer, and a current sensor is provided at an output end of the circuit breaker.

8. The voltage regulator circuit according to claim 7, wherein the current sensor is connected to the controller.

9. The voltage regulator circuit of claim 5, wherein the controller is of the type STM32, and the coil is a self-coupled coil.