CN219677184U

CN219677184U - Circuit structure for triggering permanent magnet release

Info

Publication number: CN219677184U
Application number: CN202320526354.4U
Authority: CN
Inventors: 黄堤彬; 李丹云; 李长白; 陈长发
Original assignee: Xiamen Simatesi Intelligent Electrical Co ltd
Current assignee: Xiamen Simatesi Intelligent Electrical Co ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-09-12
Anticipated expiration: 2033-03-17

Abstract

The utility model discloses a circuit structure for triggering a permanent magnetic release, which comprises the following components: the MOS field effect power tube Q1 of the switching circuit, the threshold circuit, the voltage stabilizing circuit and the filter circuit; the drain electrode of the MOS tube Q1 is connected with a tripping coil in series through a connecting terminal J1; the drain electrode of the MOS tube Q1 and the tripping coil are connected with a voltage stabilizing circuit in parallel; and the grid electrode and the source electrode of the MOS tube Q1 are connected with the voltage stabilizing circuit in parallel. The technical scheme of the utility model has the beneficial effects that: the MOS tube is voltage controlled, the control mode is convenient, the switching speed is high, the tripping device acts by controlling the conduction and interception of the MOS tube, the breaker is opened, a safe, reliable and quick control system is established, and the circuit design is simple.

Description

Circuit structure for triggering permanent magnet release

Technical Field

The utility model relates to the field of protection of power distribution networks, in particular to a circuit structure for triggering a permanent magnet release.

Background

With the development of modern industry, the requirements on the intelligence and automation of a power distribution system are continuously improved, and the life and production of people are not separated from the support of a power system, so that the power supply with good stability and high safety is necessary.

The unavoidable voltage fluctuation, flicker and the like in the power system cause power interruption, influence normal production and life, damage to electric equipment and need a breaker for ensuring safe power supply.

The trip is a device for automatically opening the circuit breaker, so that it is necessary how to implement the effective action of the trip.

In order to meet the standard requirements of the national power grid, namely when the power supply voltage is less than 30% of the rated voltage, the release cannot act; when the power supply voltage is 30% to 65% of the rated voltage, the tripping coil can act and can not act; when the power supply voltage is greater than 65% of the rated voltage, the release should trip. The circuit structure is used for solving the problem of accurate control of the tripping voltage.

Disclosure of Invention

The utility model aims to provide a circuit structure for triggering a permanent magnet mechanism release, which at least solves the problem that the release voltage of a circuit meeting the prior art does not meet the national power grid requirement.

The circuit structure comprises a switching circuit MOS tube Q1, a threshold circuit, a voltage stabilizing circuit and a tripping coil;

the drain electrode of the MOS tube Q1 is connected in series with the tripping coil through a connecting terminal J1; the drain electrode of the MOS tube Q1 and the tripping coil are connected with a voltage stabilizing circuit in parallel;

and the grid electrode and the source electrode of the MOS tube Q1 are connected with the voltage stabilizing circuit in parallel.

Further, the threshold circuit is a diode TVS1.

Further, the diode TVS1 is also connected in series with a resistor R1.

Further, the voltage stabilizing circuit is a diode TVS2.

Further, the diode TVS2 is also connected in parallel with a resistor R2.

Further, the grid electrode and the source electrode of the MOS tube Q1 are connected with the voltage conversion circuit in parallel.

Further, the voltage conversion circuit is a resistor R3.

Further, the release control circuit further comprises a filter circuit, and the filter circuit is connected with the voltage stabilizing circuit in parallel.

Further, the filter circuit is a capacitor C1.

Further, the MOS transistor Q1 is an N-channel field-power transistor.

The technical scheme of the utility model has the beneficial effects that: the MOS tube is voltage controlled, the control mode is convenient, the switching speed is high, the tripping device acts by controlling the conduction and interception of the MOS tube, the breaker is opened, a safe, reliable and quick control system is established, and the circuit design is simple.

Drawings

Fig. 1 is a circuit diagram of the quick release trigger permanent magnet release of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The quick trip disclosed in this embodiment includes: the tripping device comprises a control board and a tripping coil, wherein two ends of the tripping coil are connected with the control board, and the control board is externally connected with a power supply;

the control board is provided with a release control circuit, and the release control circuit comprises a MOS tube Q1, a threshold circuit, a voltage stabilizing circuit and a release coil;

as shown in fig. 1, the drain electrode of the MOS transistor Q1 is connected in series with the trip coil through a connection terminal J1; the drain electrode of the MOS tube Q1 and the tripping coil are connected with a voltage stabilizing circuit in parallel; and the grid electrode and the source electrode of the MOS tube Q1 are connected with the voltage stabilizing circuit in parallel.

Specifically, two ends of the tripping coil are connected with the control board through a connecting terminal J1, and the tripping coil is driven to act through the state of the MOS tube, so that the opening of the circuit breaker is realized.

According to the embodiment, the MOS tube is controlled to be conducted and cut off, so that the release is safe, reliable and fast in action, a reliable and fast control system is established, and the circuit design is simple.

Optionally, the threshold circuit is a diode TVS1.

Wherein, the diode TVS1 is also connected in series with a resistor R1.

Specifically, the resistor R1 is connected in series to the cathode of the diode TVS1, and the diode TVS1 is a two-way breakdown diode.

In this embodiment, the TVS1 plays a role of a threshold, and when the operating voltage is smaller than the threshold, the MOS transistor is turned off, and the resistor R1 plays a role of a current limiting protection device.

Optionally, the voltage stabilizing circuit is a diode TVS2.

Wherein, the diode TVS2 is also connected in parallel with a resistor R2.

Specifically, the diode TVS2 is a two-way breakdown diode.

In this embodiment, when the voltage increases to enable the TVS2 to break down, the TVS2 plays a role of voltage stabilization, the increased current passes through the diode without passing through the parallel device, so that the MOS transistor can be protected, and the resistor R2 can play a role of a current-limiting protection device.

Optionally, the gate and the source of the MOS transistor Q1 are connected in parallel to a voltage conversion circuit.

Wherein, the voltage conversion circuit is a resistor R3.

In this embodiment, due to the high input impedance of the gate of the MOS transistor, a little interference may cause misleading of the MOS transistor, so that an R3 resistor is connected in parallel between the gate and the source, and the input impedance is reduced.

Optionally, the release control circuit further comprises a filter circuit, and the filter circuit is connected with the voltage stabilizing circuit in parallel.

Wherein, the filter circuit is a capacitor C1.

The threshold circuit is connected in parallel with the VCC end of the power supply J2, and the voltage stabilizing circuit is connected in parallel with the DGND end of the power supply J2.

The connection terminals J1 and the power supply J2 can be connection terminals.

When in operation, the device comprises:

1. when the operating voltage at two ends of the J2 is less than 30% of the rated voltage required by the power grid, the diode TVS1 is cut off, the voltage vgs=0 between the gate and the source of the MOS transistor Q1, the drain D and the source S are not conducted, and the trip coil does not act.

2. When the operation voltage at two ends of the J2 is larger than the breakdown voltage of the TVS1 and smaller than the breakdown voltage of the TVS2, the diode TVS1 is conducted, the voltage Vgs between the grid electrode and the source electrode of the MOS tube Q1 is larger than 0, the grid voltage meets the gate valve voltage of the MOS tube, the drain electrode D is conducted with the source electrode S, and the tripping coil can act and can not act.

3. When the operating voltage at two ends of the J2 is greater than 65% of the rated voltage, the diode TVS1 is conducted, the voltage Vgs between the grid electrode and the source electrode of the MOS tube Q1 is greater than 0, the drain electrode D is conducted with the source electrode S, the tripping coil acts, and the breaker is opened.

The utility model solves the problems that the existing release is too long in action time, so that the breaker is too slow to break, the fault can not be rapidly cut off, the safety of people and electric equipment are harmed, and economic loss is caused.

The trigger circuit structure is added in the voltage coil with the electromagnet, so that when the operating power supply is lower than 30% of rated operating voltage, the release coil cannot act; when the operating power supply is greater than or equal to 65% of rated operating voltage, the iron core of the release coil cannot attract the armature, the armature is pulled upwards, the breaker is pushed to break through the transmission mechanism, rapid action is achieved, the circuit is protected, the electric equipment is protected, and accurate control of the release voltage is achieved.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present utility model after reading the present specification, and these modifications and variations do not depart from the scope of the utility model as claimed in the pending claims.

Claims

1. A circuit structure for triggering a permanent magnet release, characterized by: the circuit structure comprises a switching circuit MOS tube Q1, a threshold circuit, a voltage stabilizing circuit, a filter circuit and a tripping coil;

the drain electrode of the MOS tube Q1 is connected in series with the tripping coil through a connecting terminal J1;

the drain electrode of the MOS tube Q1 and the tripping coil are connected with a voltage stabilizing circuit in parallel; and the grid electrode and the source electrode of the MOS tube Q1 are connected with the voltage stabilizing circuit in parallel.

2. The circuit structure for triggering a permanent magnet trip according to claim 1 wherein the threshold circuit is a diode TVS1.

3. The circuit structure for triggering a permanent magnet trip according to claim 2 wherein the diode TVS1 is further connected in series with a resistor R1.

4. The circuit structure for triggering a permanent magnet trip according to claim 1 wherein the voltage stabilizing circuit is a diode TVS2.

5. The circuit configuration for triggering a permanent magnet trip according to claim 4 wherein the diode TVS2 is also connected in parallel with a resistor R2.

6. The circuit structure for triggering a permanent magnetic trip according to claim 1, wherein the gate and source of the MOS transistor Q1 are connected in parallel to a voltage conversion circuit.

7. The circuit configuration for triggering a permanent magnet release according to claim 6, wherein the voltage conversion circuit is a resistor R3.

8. The circuit configuration for triggering a permanent magnet trip unit according to claim 1, wherein the trip unit control circuit further comprises a filter circuit connected in parallel with the voltage stabilizing circuit.

9. The circuit structure for triggering a permanent magnet release according to claim 8, wherein the filter circuit is a capacitor C1.