CN101582338B - A bistable permanent magnet operating mechanism control circuit - Google Patents

Abstract

The invention relates to a bistable permanent magnetism operating mechanism control circuit and belongs to the electrical equipment technical field. The control circuit comprises a capacitance C, a tripping coil, a closing coil and controlled switching tube VT1 and VT3; the invention is characterized by replacing traditional freewheel diodes by controlled switching tube VT2 and VT4. The control circuit has the advantages that firstly, the coil volume is greatly reduced so that the design of mechanism can be smaller; secondly, the response time can be decreased so that the working speed of mechanism can be improved; thirdly, the capacity or precharge pressure of the capacitance can be reduced.

Description

A bistable permanent magnet operating mechanism control circuit

technical field

The invention relates to a control circuit of a bistable permanent magnet operating mechanism, which belongs to the technical field of electric equipment.

Background technique

The bistable permanent magnet operating mechanism has been used more and more in the field of power switches, especially in vacuum circuit breakers. With the increase of high-voltage and ultra-high voltage AC transmission projects, higher requirements are put forward for the bistable permanent magnet operating mechanism. Not only requires the bistable permanent magnet operating mechanism to respond quickly, have small time dispersion, and realize synchronous opening and closing, but also requires the mechanism to be operated with a low-power power supply. At the same time, in order to adapt to the existing design of the power system switch cabinet, it is also necessary The organization is as small as possible. However, the current control circuit limits the bistable permanent magnet actuator to meet all the above requirements.

Contents of the invention

The object of the present invention is to provide a bistable permanent magnet operating mechanism control circuit with small volume, short response time and small required capacitor capacity.

The technical solution of the present invention is: a bistable permanent magnet operating mechanism control circuit, including a capacitor C, an opening coil, a closing coil, switching tubes VT1, VT3, and is characterized in that it also includes switching tubes VT2 and VT4, Among them, the collectors of the switching tubes VT1 and VT4 are respectively connected to the two ends of the capacitor C; the emitters of the two are respectively connected to the emitters of the switching tubes VT2 and VT3; the collectors of the switching tubes VT2 and VT3 are respectively connected to the switch The collectors of the tubes VT1 and VT4 are connected; the two ends of the opening coil are respectively connected to the collector and the emitter of the switching tube VT2; the two ends of the closing coil are respectively connected to the collector and the emitter of the switching tube VT4; the controllable switching tube VT2 and VT4 can use power MOSFET, IGBT and other fully controlled switches.

The above bistable permanent magnet operating mechanism control circuit is characterized in that: the switch tubes VT2 and VT4 are controllable switch tubes.

The above bistable permanent magnet operating mechanism control circuit is characterized in that: the capacitor C is a generalized energy storage power source, which can be a common electrolytic capacitor or other types of power sources such as batteries.

The beneficial effects of the present invention are: use the controllable switch tubes VT2 and VT4 to replace the freewheeling diodes used in the traditional control circuit, and through the control of VT2 and VT4, ensure that the non-working coil circuit is disconnected when the working coil circuit is turned on, so that there is no It will generate an induced current to excite the magnetic field in the opposite direction, greatly reducing the initial ampere-turns and maximum ampere-turns of the moving iron core, so it can reduce the temperature rise inside the mechanism, and because the current density of the wire has an upper limit, it is designed The volume of the coil can be reduced, so that the volume and weight of the mechanism can be reduced.

Using the controllable switch tubes VT2 and VT4 to replace the traditional freewheeling diodes can reduce the response time of the mechanism and improve the action speed for the same mechanism structure parameters and power supply parameters. Reducing the response time of the mechanism can reduce the time for the line to withstand abnormal working conditions such as short circuit, and the fast action speed can better meet the requirements of the high voltage switch for the opening speed.

Because the maximum number of ampere-turns is reduced, the capacity of the capacitor or the charging voltage of the capacitor can be reduced while meeting the requirements of the action of the mechanism. Reducing the charging voltage of the capacitor realizes the requirement of low-power power supply operation, and reducing the capacity of the capacitor can save the space occupied by the capacitor.

Description of drawings

Fig. 1 is a schematic diagram of a control circuit of a bistable permanent magnet operating mechanism according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a mechanism body controlled by a control circuit of a bistable permanent magnet operating mechanism according to an embodiment of the present invention.

Detailed ways

In the description of the marks in Fig. 2, the moving guide rod 1, the end cover 2, the moving iron core 3, the opening coil 4, the permanent magnet 5, the magnetic yoke 6, and the closing coil 7.

Referring to Fig. 1, a kind of bistable permanent magnet operating mechanism control circuit comprises capacitor C, opening coil (i.e. L1), closing coil (i.e. L2), switching tubes VT1, VT3, and is characterized in that: it also includes switch The tubes VT2 and VT4, wherein, the collectors of the switching tubes VT1 and VT4 are respectively connected to the two ends of the capacitor C; and the emitters of the two are respectively connected to the emitters of the switching tubes VT2 and VT3; the switching tubes VT2 and VT3 The collectors are respectively connected to the collectors of the switching tubes VT1 and VT4; the two ends of the opening coil are respectively connected to the collector and the emitter of the switching tube VT2; the two ends of the closing coil are respectively connected to the collector and the emitter of the switching tube VT4 ; The controllable switch tubes VT2 and VT4 can be fully controlled switches such as power MOSFETs and IGBTs. The capacitor C is precharged by an external circuit to provide excitation energy for the mechanism; the switch tubes VT1, VT2, VT3, and VT4 are controllable switches that control the on and off of the circuit.

The above bistable permanent magnet operating mechanism control circuit is characterized in that: the switch tubes VT2 and VT4 are controllable switch tubes.

The above bistable permanent magnet operating mechanism control circuit is characterized in that: the capacitor C is a generalized energy storage power source, which can be a common electrolytic capacitor or other types of power sources such as batteries.

Referring to Fig. 1, Fig. 2, the control mode of the bistable permanent magnet operating mechanism control circuit of the embodiment of the present invention is as follows:

For the position state in Figure 2, the moving iron core 3 is in the closing position. If the opening operation is performed, a trigger signal must be added to the switch tube VT1 to make it conduct, and at the same time, VT2, VT3, and VT4 are all in the cut-off state. C supplies power to the opening coil 4 through the switch tube VT1, and drives the moving iron core 3 to move upward. When the movement is in place, the switch tube VT1 is turned off, the switch tube VT2 is turned on, and the opening coil 4 continues to flow through the switch tube VT2 circuit.

When the moving iron core 3 is in the opening position, if the closing operation is performed, a trigger signal needs to be added to the switch tube VT3 to make it conduct, and at the same time, the switch tubes VT1, VT2, and VT4 are all in the cut-off state, and the capacitor C passes through the switch tube VT3 Power is supplied to the closing coil 7 to drive the moving iron core 3 to move downward. When the movement is in place, the switch tube VT3 is turned off, the switch tube VT4 is turned on, and the closing coil 7 continues to flow through the circuit of the switch tube VT4.

Claims (5)

1. A bistable permanent magnet operating mechanism control circuit, comprising capacitor C, opening coil, closing coil and switching tube VT1, VT3, is characterized in that: Also includes switch tubes VT2 and VT4; Wherein, the collectors of the switching tubes VT1 and VT4 are respectively connected to both ends of the capacitor C, and the emitters of the two are respectively connected to the emitters of the switching tubes VT2 and VT3; The collectors of the switching tubes VT2 and VT3 are respectively connected to the collectors of the switching tubes VT1 and VT4; The two ends of the opening coil are respectively connected to the collector and emitter of the switching tube VT2; Both ends of the closing coil are respectively connected to the collector and emitter of the switching tube VT4. 2. The bistable permanent magnet operating mechanism control circuit according to claim 1, characterized in that: said switch tubes VT2 and VT4 are controllable switch tubes. 3. The bistable permanent magnet operating mechanism control circuit according to claim 1, characterized in that: said capacitor C is a generalized energy storage power supply. 4. The bistable permanent magnet operating mechanism control circuit according to claim 1, characterized in that: said capacitor C is an electrolytic capacitor. 5. The bistable permanent magnet operating mechanism control circuit according to claim 1, characterized in that: the capacitor C is replaced by a storage battery.

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