CN218071315U

CN218071315U - Power supply system for permanent magnet operating mechanism

Info

Publication number: CN218071315U
Application number: CN202222411099.7U
Authority: CN
Inventors: 刘俊超; 胡湘捷; 彭俊荟; 孙荣豪; 蔡芮; 任明; 王文华
Original assignee: Tonghao Changsha Rail Traffic Control Technology Co ltd; Xian Jiaotong University
Current assignee: Tonghao Changsha Rail Traffic Control Technology Co ltd; Xian Jiaotong University
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2022-12-16
Anticipated expiration: 2032-09-09

Abstract

The present disclosure discloses a power supply system for a permanent magnet actuator, comprising: a rectifier, a BOOST converter and a BUCK converter; the input end of the rectifier is externally connected with an alternating current-direct current voltage source, and the output end of the rectifier is connected with the first input end of the BOOST converter; the output end of the BOOST converter is connected with the first input end of the BUCK converter, and the output end of the BUCK converter is connected with the capacitor.

Description

Power supply system for permanent magnet operating mechanism

Technical Field

The disclosure belongs to the technical field of power electronics, and particularly relates to a power supply system for a permanent magnet operating mechanism.

Background

In the development of the country and the life of people, an electric power system plays a very important role, while a large number of power transmission and transformation equipment exist in the work of the electric power system, and a high-voltage circuit breaker is responsible for the double tasks of controlling and protecting the safe and stable operation of the electric power system. The vacuum circuit breaker of the permanent magnet operating mechanism has the remarkable advantages of small volume, light weight, simple structure, reliable operation, no maintenance, long service life and the like, and is widely applied.

The opening and closing operation of the vacuum circuit breaker can be realized only by carrying out forward and reverse electrification on the opening and closing coil in the permanent magnet operating mechanism and obtaining a large opening and closing current. However, in order to generate a very large switching-on and switching-off current in a very short time, the best scheme is to discharge by using a capacitor, wherein the capacitor can instantly bear high pulsating current output and the charging time is very short. The capacitor has a great demand on the reliability of the power supply system of the permanent magnet operating mechanism due to the special material of the capacitor. The ripple of the charging current affects the lifetime of the capacitor, and in order to increase the lifetime of the capacitor, it is necessary to reduce the ripple of the charging current as much as possible. The ultra-wide voltage variation range of the capacitor also requires that the power supply system can stably work in the ultra-wide output voltage range. Meanwhile, in order to meet the requirement of adapting to power supply of an alternating current-direct current system, the variation range of the power supply voltage is large, and a power supply system needs to charge a capacitor in an ultra-wide input voltage range.

The existing permanent magnet mechanism power supply system has the defects of low charging efficiency, poor charging stability, slow charging speed, short service life and the like, and poor overall reliability (see reference [1] forest height and plum brightness; a power supply device [ P ] Jiansu: CN201328017, 2009-10-14.[2] Wangguanshun; a permanent magnet switch operating mechanism opening and closing power supply [ P ]. Shandong: CN2387627, 2000-07-12.[3] Jinhui; a special rapid switch power supply [ P ] Anhui: CN206658156U, 2017-11-21.) for a permanent magnet operating mechanism. With the continuous development of power electronic technology, power supply systems are continuously improved. The switch power supply becomes a preferred structure of the permanent magnet operating mechanism power supply system with high efficiency, high frequency, lower output current ripple, ultra-wide input voltage range and output voltage range, the service life of the capacitor can be greatly prolonged by adopting the switch power supply technology, and the capacitor is stably charged, so that the reliability of the whole permanent magnet operating mechanism device is improved.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies in the prior art, it is an object of the present disclosure to provide a power supply system for a permanent magnet actuator, which can provide a charging current with low output current ripple while satisfying the ac/dc power supply requirement, thereby improving the reliability and the service life of the entire permanent magnet actuator.

In order to achieve the above purpose, the present disclosure provides the following technical solutions:

a power supply system for a permanent magnet actuator comprising: a rectifier, a BOOST converter and a BUCK converter; wherein the content of the first and second substances,

the input end of the rectifier is externally connected with an alternating current-direct current voltage source, and the output end of the rectifier is connected with the first input end of the BOOST converter;

the output end of the BOOST converter is connected with the first input end of the BUCK converter, and the output end of the BUCK converter is connected with the capacitor.

Preferably, the rectifier includes: the circuit comprises a rectifier bridge, a fuse and an NTC thermistor R1; wherein, the first and the second end of the pipe are connected with each other,

one end of the fuse is connected with an input end interface of the alternating current-direct current voltage source, and the other end of the fuse is connected with an AC1 pole of the rectifier bridge; one end of the NTC thermistor R1 is connected with an input end interface of an alternating current and direct current voltage source, and the other end of the NTC thermistor R1 is connected with an AC2 pole of the rectifier bridge.

Preferably, the BOOST converter includes: the first power circuit comprises an MOSFET tube Q1, an inductor L1, an input capacitor C1, an output capacitor C2 and a diode D1, wherein one end of the inductor L1 is connected with the anode of the input capacitor C1, the other end of the inductor L1 is connected with the drain electrode of the MOSFET tube Q1 and the anode of the diode D1, the cathode of the diode is connected with the anode of the output capacitor C2, and the cathode of the input capacitor C1 and the cathode of the output capacitor C2 are connected with the source electrode of the MOSFET tube Q1.

Preferably, the BUCK converter includes: and the second power circuit comprises a MOSFET (metal-oxide-semiconductor field effect transistor) Q2, an inductor L2, an input capacitor C2, an output capacitor C3, diodes D2 and D3, the drain electrode of the MOSFET Q2 is connected with the anode of the input capacitor C2, the source electrode of the MOSFET Q2 is connected with the cathode of the diode D2 and one end of the inductor L2, the other end of the inductor L2 is connected with the anode of the output capacitor C3, and the cathode of the input capacitor C2 and the anode of the diode D2 are connected to the cathode of the output capacitor C3 together.

Preferably, the power supply system further includes a FLYBACK auxiliary power supply device, an input end of the FLYBACK auxiliary power supply device is connected to the rectifier, a first output end of the FLYBACK auxiliary power supply device is connected to a second input end of the BOOST converter, and a second output end of the FLYBACK auxiliary power supply device is connected to a second input end of the BUCK converter.

Preferably, the FLYBACK auxiliary power supply device includes: the FLYBACK converter is connected with a FLYBACK controller.

Preferably, the power supply system further includes an overvoltage protection device, a first output end of the overvoltage protection device is connected to a third input end of the BOOST converter, and a second output end of the overvoltage protection device is connected to a third input end of the BUCK converter.

Preferably, the overvoltage protection device includes: the input end of the operational amplifier is connected to the output ends of the BOOST converter and the BUCK converter respectively, the output end of the operational amplifier is connected to the output end of the comparator, and the output end of the comparator is connected to the BOOST-BUCK controller.

Compared with the prior art, the beneficial effect that this disclosure brought does:

1. constant capacitor charging current is realized, the capacitor charging speed is increased, the current ripple is very small, and the service life of the capacitor is prolonged;

2. the power supply system works under the high switching frequency of 200kHz, so that the volume of the whole device of the power supply system is reduced;

3. the power is taken from the input end through the auxiliary power supply, so that the self-power supply of the device is realized.

Drawings

Fig. 1 is a schematic diagram illustrating an overall structure of a power supply system for a permanent magnet actuator according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit diagram of a power supply system for a permanent magnet actuator according to another embodiment of the present disclosure.

Detailed Description

Specific embodiments of the present disclosure will be described in detail below with reference to fig. 1 to 2. While specific embodiments of the disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. The description and claims do not intend to distinguish between components that differ in noun but not in function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the disclosure, but is made for the purpose of illustrating the general principles of the disclosure and not for the purpose of limiting the scope of the disclosure. The scope of the present disclosure is to be determined by the terms of the appended claims.

For the purpose of facilitating an understanding of the embodiments of the present disclosure, the following detailed description is to be construed in conjunction with the accompanying drawings, and the various drawings are not intended to limit the embodiments of the present disclosure.

In one embodiment, as shown in fig. 1, the present disclosure provides a power supply system for a permanent magnet actuator, comprising: a rectifier, a BOOST converter and a BUCK converter; wherein the content of the first and second substances,

The above embodiments constitute a complete technical solution of the present disclosure, and the working principle of the device in this embodiment is as follows:

firstly, an interface of a power supply system device of the permanent magnet operating mechanism is connected to 220V (+ -10%) alternating current and direct current voltage, and the alternating current and direct current voltage outputs 200V-350V direct current voltage through a rectifier.

And secondly, the output end of the rectifier is connected to a Flyback converter, the voltage in the range of 200V to 350V is converted into two paths of mutually isolated 20V voltages, and the two paths of mutually isolated 20V voltages respectively supply power to the BOOST converter and the BUCK converter.

Then, the output end of the rectifier is connected to the input end of the BOOST converter, and the BOOST converter starts to work after the auxiliary power supply arrives, so that the direct-current voltage in the range of 200V to 350V is converted into the range of 280V to 350V.

Then, the output terminal of the BOOST converter is connected to the input terminal of the BUCK converter, the BUCK converter starts to operate after the auxiliary power supply comes, and the capacitor is charged to 220V from 0V with a constant current in 15s under the condition of an input voltage of 280V to 350V.

And finally, starting the overvoltage protection device to work when the auxiliary power supply arrives, detecting the BOOST output voltage and the BUCK output voltage, protecting the output voltage of each port, and turning off the work of each control chip when overvoltage occurs, thereby ensuring the reliable operation of the power supply system device.

In another embodiment, as shown in fig. 2, the rectifier includes: the circuit comprises a rectifier bridge, a fuse and an NTC thermistor R1; wherein, the first and the second end of the pipe are connected with each other,

one end of the fuse is connected with an input end interface of an alternating current and direct current voltage source, and the other end of the fuse is connected with an AC1 pole of the rectifier bridge; one end of the NTC thermistor R1 is connected with an input end interface of an alternating current-direct current voltage source, and the other end of the NTC thermistor R1 is connected with an AC2 pole of a rectifier bridge.

In this embodiment, the rectifier can rectify the ac input voltage into the dc voltage for output, and the dc input voltage can be directly output, the output voltage range is large, 200-340V, the fuse separates the whole device from the power supply by breaking when the input current is large, the safety of the device is protected, and the NTC thermistor can reduce the surge current at the moment of power-on, thereby protecting the components in the power supply system.

In another embodiment, as shown in fig. 2, the BOOST converter includes: the first power circuit comprises a MOSFET (metal-oxide-semiconductor field effect transistor) tube Q1, an inductor L1, an input capacitor C1, an output capacitor C2 and a diode D1, wherein one end of the inductor L1 is connected with the anode of the input capacitor C1, the other end of the inductor L1 is connected with the drain electrode of the MOSFET tube Q1 and the anode of the diode D1, the cathode of the diode is connected with the anode of the output capacitor C2, and the cathode of the input capacitor C1 and the cathode of the output capacitor C2 are connected with the source electrode of the MOSFET tube Q1. In addition, the BOOST converter adopts a control chip LM5022MM as a first control circuit, and controls the first power circuit through a peak current mode.

In this embodiment, the BOOST converter operates at a high switching frequency of 200kHz, reduces the size of an inductor, converts a large voltage range output by the rectifier into a small range, and has an input voltage sampling device, when the input voltage is higher than 280V, the control chip is not started, the input voltage is directly output to the output voltage, and when the input voltage is lower than 280V, the control chip is started to increase the input voltage to 310V, so that the voltage range from 200V to 340V is converted into the small range from 280V to 340V, and is all higher than the capacitor voltage 220V, which is convenient for the BUCK converter to operate, and has a soft start function, and the surge current during starting is suppressed.

In another embodiment, as shown in fig. 2, the BUCK converter includes: and the second power circuit comprises a MOSFET (metal-oxide-semiconductor field effect transistor) tube Q2, an inductor L2, an input capacitor C2, an output capacitor C3, diodes D2 and D3, the drain electrode of the MOSFET tube Q2 is connected with the anode of the input capacitor C2, the source electrode of the MOSFET tube Q2 is connected with the cathode of the diode D2 and one end of the inductor L2, the other end of the inductor L2 is connected with the anode of the output capacitor C3, and the cathode of the input capacitor C2 and the anode of the diode D2 are connected to the cathode of the output capacitor C3 together. In addition, the BUCK converter employs the control chip LM5022MM as a second control circuit, and controls the second power circuit by a peak current mode.

In the embodiment, the BUCK converter device works at a high switching frequency of 200kHz, so that the size of an inductor and ripple of charging current are reduced, constant-current charging is performed on a capacitor load under the voltage of 280V to 340V output by the BOOST converter, the capacitor voltage is charged from 0V to 220V within 15s by using smaller current ripple, and the service life of a capacitor is prolonged. A10-ohm resistor is connected in series on the output side, so that current-limiting protection is performed when a load is short-circuited or the voltage of a capacitor is small, and the problem of the minimum duty ratio of an analog control chip is solved. Meanwhile, the circuit is provided with an input voltage sampling circuit, and is started when the input voltage is higher than 240V, so that the constant-on state when the input voltage is small and the output voltage is small is avoided.

In another embodiment, as shown in fig. 2, the power supply system further includes a FLYBACK auxiliary power supply device, an input end of the FLYBACK auxiliary power supply device is connected to the rectifier, a first output end of the FLYBACK auxiliary power supply device is connected to a second input end of the BOOST converter, and a second output end of the FLYBACK auxiliary power supply device is connected to a second input end of the BUCK converter.

In this embodiment, the auxiliary power supply device for the FLYBACK includes a FLYBACK converter, and the FLYBACK converter is connected with a FLYBACK controller. The FLYBACK converter comprises a MOSFET Q3, a transformer T1, rectifier diodes D6 and D7, an input capacitor C5, output capacitors C7 and C8 and an RCD buffer (composed of a resistor R2, an input capacitor C6 and a diode D5); the two interfaces on the primary side of the transformer are respectively connected to the anode of an input capacitor C5 and the drain of a MOSFET (metal oxide semiconductor field effect transistor) Q3, the two interfaces on the secondary side of the transformer are respectively connected to the anodes of rectifier diodes D6 and D7 and the cathodes of output capacitors C7 and C8, the source of the MOSFET Q3 is connected to the cathode of the input capacitor C5, the cathodes of the rectifier diodes D6 and D7 are connected to the anodes of the output capacitors C7 and C8, and the RCD buffer is connected to the two ends of the primary side of the transformer.

The FLYBACK auxiliary power supply device works at a high switching frequency of 100kHz, the size of a transformer is reduced, two paths of 20V voltages are output by taking power from the output voltage of the rectifier bridge, and power is supplied to a control circuit, a sampling circuit and a driving circuit of a BOOST converter and a BUCK converter respectively, so that the self-powered function is achieved.

In another embodiment, as shown in fig. 2, the power supply system further comprises an overvoltage protection device.

In this embodiment, the overvoltage protection device includes: the input end of the operational amplifier is connected to the output ends of the BOOST converter and the BUCK converter respectively, the output end of the operational amplifier is connected to the output end of the comparator, and the output end of the comparator is connected to the BOOST-BUCK controller.

In this embodiment, the overvoltage protection device detects the capacitor load voltage, and turns off the BUCK converter control chip when the voltage is higher than 240V, so as to perform overvoltage protection on the capacitor. The BOOST output voltage is detected, and the BOOST converter control chip is closed when the voltage is higher than 350V, so that overvoltage protection of components of the device is realized. The overvoltage protection device improves the reliability of the power supply system.

The foregoing description of the present disclosure has been presented with specific examples to aid understanding thereof, and is not intended to limit the present disclosure. Any partial modification or replacement within the technical scope disclosed in the present disclosure by a person skilled in the art should be included in the scope of the present disclosure.

Claims

1. A power supply system for a permanent magnet actuator comprising: a rectifier, a BOOST converter and a BUCK converter; wherein the content of the first and second substances,

2. The power supply system of claim 1, wherein the rectifier comprises: the circuit comprises a rectifier bridge, a fuse and an NTC thermistor R1; wherein the content of the first and second substances,

one end of the fuse is connected with an input end interface of the alternating current-direct current voltage source, and the other end of the fuse is connected with an AC1 pole of the rectifier bridge; one end of the NTC thermistor R1 is connected with an input end interface of an alternating current-direct current voltage source, and the other end of the NTC thermistor R1 is connected with an AC2 pole of a rectifier bridge.

3. The power supply system of claim 1, wherein the BOOST converter comprises: the first power circuit comprises an MOSFET tube Q1, an inductor L1, an input capacitor C1, an output capacitor C2 and a diode D1, wherein one end of the inductor L1 is connected with the anode of the input capacitor C1, the other end of the inductor L1 is connected with the drain electrode of the MOSFET tube Q1 and the anode of the diode D1, the cathode of the diode is connected with the anode of the output capacitor C2, and the cathode of the input capacitor C1 and the cathode of the output capacitor C2 are connected with the source electrode of the MOSFET tube Q1.

4. The power supply system of claim 1, wherein the BUCK converter comprises: and the second power circuit comprises a MOSFET (metal-oxide-semiconductor field effect transistor) tube Q2, an inductor L2, an input capacitor C2, an output capacitor C3, diodes D2 and D3, the drain electrode of the MOSFET tube Q2 is connected with the anode of the input capacitor C2, the source electrode of the MOSFET tube Q2 is connected with the cathode of the diode D2 and one end of the inductor L2, the other end of the inductor L2 is connected with the anode of the output capacitor C3, and the cathode of the input capacitor C2 and the anode of the diode D2 are connected to the cathode of the output capacitor C3 together.

5. The power supply system of claim 1, further comprising a FLYBACK auxiliary power supply device, wherein an input terminal of the FLYBACK auxiliary power supply device is connected to the rectifier, a first output terminal of the FLYBACK auxiliary power supply device is connected to a second input terminal of the BOOST converter, and a second output terminal of the FLYBACK auxiliary power supply device is connected to a second input terminal of the BUCK converter.

6. The power supply system of claim 5, wherein the FLYBACK auxiliary power supply means comprises: the FLYBACK converter is connected with a FLYBACK controller.

7. The power supply system of claim 1, further comprising an overvoltage protection device, a first output of the overvoltage protection device being connected to the third input of the BOOST converter, and a second output of the overvoltage protection device being connected to the third input of the BUCK converter.

8. The power supply system of claim 7, wherein the over-voltage protection device comprises: the input end of the operational amplifier is connected to the output ends of the BOOST converter and the BUCK converter respectively, the output end of the operational amplifier is connected to the output end of the comparator, and the output end of the comparator is connected to the BOOST-BUCK controller.