CN210954257U

CN210954257U - Current breaking device for testing instantaneous large current of direct-current power relay

Info

Publication number: CN210954257U
Application number: CN201921438459.4U
Authority: CN
Inventors: 幸宗国; 齐凡凡; 孙杰
Original assignee: 幸宗国
Current assignee: Shaghai Hansheng Power Supply System Co.,Ltd.
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-07-07
Anticipated expiration: 2029-08-30

Abstract

The utility model provides a direct current power relay instantaneous large current test outage device, direct current power supply V 'S positive pole, by survey current relay K and inductance L constitution major loop output, direct current power supply V' S negative pole is the major loop input, it has resistance R1 and resistance R2 to establish ties respectively between major loop output and the major loop input, it has outage current module S to establish ties between resistance R1 and the major loop, it constitutes resistance R1 and outage current module S and establishes ties the back and parallelly connected connection structure of resistance R2; the power-off current module S comprises a capacitor C, a first IGBT switch and a second IGBT switch, wherein the capacitor C is connected in series between a collector of the first IGBT switch and an emitter of the second IGBT switch, the emitter of the first IGBT switch and the collector of the second IGBT switch are connected to the input end of the main loop, and the emitter of the second IGBT switch is connected to the output end of the main loop.

Description

Current breaking device for testing instantaneous large current of direct-current power relay

Technical Field

The utility model belongs to the technical field of the transistor, concretely relates to instantaneous heavy current test outage device of direct current power relay.

Background

As shown in fig. 1-2, the instantaneous large current testing process of the dc relay includes setting the dc power output as the working voltage of the dc relay to be tested, setting the resistance of the resistor R2 as the resistance capable of generating the rated current of the relay, setting the resistance of the resistor R1 as the resistance capable of generating 3 times of the rated current of the dc relay K to be tested, and setting the inductor L as the resistance capable of slowly starting to reach 4 times of the rated current value within 7.5ms after the relay to be tested is switched on according to the resistances of the resistor R1 and the resistor R2. And closing the relay switch K1, closing the direct current relay to be tested, and opening the closed relay switch K1 7.5ms after the direct current relay K to be tested is closed, so that the test is completed. Because the main loop has the inductor L, the relay switch K1 is opened instantaneously, and the main loop generates surge voltage.

The traditional instantaneous current test of the direct current power relay needs to be divided into multiple sections by using a low-power direct current contactor as a loop cut-off switch to reduce current so as to reduce surge voltage generated in a loop (but the loop still has the surge voltage generated to cause a main loop current test waveform to be nonstandard) because surge voltage suppression equipment caused by instantaneous current interruption does not exist, the current reduction step is complicated, the cost of a current interruption device is high, the response time of the direct current contactor is long, and the direct current power relay to be tested is possibly damaged due to long-time overcurrent because the action response time of the direct current contactor is long.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a direct current power relay instantaneous large current test outage device to solve current direct current power relay instantaneous current test because there is not the surge voltage suppression equipment that transient current break caused, the current reduction step is loaded down with trivial details, outage stream device is with high costs and long-time electric current causes to be surveyed direct current power relay and damages the scheduling problem.

The utility model provides a following technical scheme:

an instantaneous large current test current breaking device of a direct current power relay comprises a main loop, wherein the main loop comprises a direct current power supply V, a tested direct current relay K and an inductor L which are sequentially connected in series, the positive pole of the direct current power supply V, the tested direct current relay K and the inductor L form a main loop output end, the negative pole of the direct current power supply V is a main loop input end, a resistor R1 and a resistor R2 are respectively connected in series between the main loop output end and the main loop input end, a current breaking module S is connected in series between the resistor R1 and the main loop, and a connecting structure is formed in which the resistor R1 is connected in series with the current breaking module S and then is connected with the resistor R2 in parallel; the power-off current module S comprises a capacitor C, a first IGBT switch and a second IGBT switch, wherein the capacitor C is connected between a collector electrode of the first IGBT switch and an emitter electrode of the second IGBT switch in series, the emitter electrode of the first IGBT switch and the collector electrode of the second IGBT switch are connected to the input end of the main loop, and the emitter electrode of the second IGBT switch is connected to the output end of the main loop.

Furthermore, the power failure current module S further comprises a copper bar assembly attached to the first IGBT switch and the second IGBT for heat dissipation.

Furthermore, a thermistor temperature sensing element is connected to the copper bar assembly.

The utility model has the advantages that:

the invention relates to an instantaneous large current test current breaking device of a direct current power relay, wherein a current breaking module S is connected into a main loop in series to serve as a switch for cutting off the loop, when the loop current needs to be cut off, a first ICBT switch and a second IGBT switch are controlled to be disconnected, body diodes in the first IGBT switch and the second IGBT and a capacitor C form a surge voltage suppression circuit, and the loop is instantaneously disconnected while the surge voltage suppression circuit works; compare with traditional miniwatt direct current contactor has return circuit surge voltage suppression circuit simultaneously as return circuit cut-off switch, realized: the cost of the current cutting device is reduced, the response time of the cut current is fast, and the control of the cut current is convenient and reliable; during instantaneous current testing, current voltage oscillation of a main loop cannot be caused, so that the testing is completely carried out according to the testing standard of the direct-current relay; the risk that the main loop has surge voltage during testing is completely solved, and the surge voltage suppression circuit is simple and reliable.

The response time of the power-off current is fast, and the circuit works more safely and reliably.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a block diagram of a conventional DC relay instantaneous high current test system;

FIG. 2 is a current waveform diagram of a DC relay instantaneous current test;

fig. 3 is a block diagram of the instantaneous large current testing system of the dc relay of the present invention;

fig. 4 is a schematic view of the current interruption module S according to the present invention.

Detailed Description

As shown in fig. 3, an instantaneous large current test current interruption device for a dc power relay includes a main loop, where the main loop includes a dc power supply V, a dc relay K to be tested, and an inductor L, which are sequentially connected in series, an anode of the dc power supply V, the dc relay K to be tested, and the inductor L constitute a main loop output end, a cathode of the dc power supply V serves as a main loop input end, a resistor R1 and a resistor R2 are respectively connected in series between the main loop output end and the main loop input end, a current interruption module S is connected in series between the resistor R1 and the main loop, and constitutes a connection structure in which the resistor R1 is connected in series with the current interruption module S and then connected in parallel with the resistor R2;

as shown in fig. 4, the current breaking module S includes a capacitor C, a first IGBT switch and a second IGBT switch, the capacitor C is connected in series between a collector of the first IGBT switch and an emitter of the second IGBT switch, the emitter of the first IGBT switch and the collector of the second IGBT switch are connected to the main circuit input end, and the emitter of the second IGBT switch is connected to the main circuit output end.

Specifically, the power-off current module S is further arranged on the first IGBT switch and the second IGBT in a sticking mode and used for radiating the copper bar assembly, and the copper bar assembly is further connected with a thermistor temperature sensing element.

The working principle of the specific embodiment is as follows: when the loop current needs to be cut off, the first ICBT switch and the second IGBT switch are controlled to be switched off, a surge voltage suppression circuit is formed by body diodes in the first IGBT switch and the second IGBT and a capacitor C, and the loop is switched off instantaneously while the surge voltage suppression circuit works.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. 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. An instantaneous large current test current breaking device of a direct current power relay is characterized by comprising a main loop, wherein the main loop comprises a direct current power supply V, a tested direct current relay K and an inductor L which are sequentially connected in series, the positive pole of the direct current power supply V, the tested direct current relay K and the inductor L form a main loop output end, the negative pole of the direct current power supply V is a main loop input end, a resistor R1 and a resistor R2 are respectively connected in series between the main loop output end and the main loop input end, a current breaking module S is connected in series between the resistor R1 and the main loop, and the current breaking module S forms a connecting structure that the resistor R1 is connected in series with the current breaking module S and then is connected with the resistor R2 in parallel;

the power-off current module S comprises a capacitor C, a first IGBT switch and a second IGBT switch, wherein the capacitor C is connected between a collector electrode of the first IGBT switch and an emitter electrode of the second IGBT switch in series, the emitter electrode of the first IGBT switch and the collector electrode of the second IGBT switch are connected to the input end of the main loop, and the emitter electrode of the second IGBT switch is connected to the output end of the main loop.

2. The instantaneous high-current test current interruption device for the direct-current power relay according to claim 1, wherein the current interruption module S further comprises a copper bar assembly attached to the first IGBT switch and the second IGBT for heat dissipation.

3. The instantaneous large current test current interruption device for the direct current power relay as claimed in claim 2, wherein a thermistor temperature sensing element is further connected to the copper bar assembly.