阅读说明：本技术 一种保护电路 (Protective circuit ) 是由 杜伟 陈佳 郑钟鹏 林华 刘程宇 于 2020-04-24 设计创作，主要内容包括：本发明提供了一种保护电路,其包括自恢复保护电路、开关电路、保护电路供电电路、保护信号产生电路和保护电路；直流电源或直流母线V1端通过开关电路与直流电源或直流母线V2端连接,所述自恢复保护电路的一端与开关电路的一端连接,所述自恢复保护电路的一端与开关电路的另一端连接,所述开关电路与保护电路连接；所述保护电路供电电路、保护信号产生电路分别与直流电源或直流母线V1端、直流电源或直流母线V2端连接,所述保护电路供电电路、保护信号产生电路连接后与保护电路连接。采用本发明的技术方案,具有短路保护功能,当发生短路时,电路均可断开,故障消除后,电路供电可自动恢复,提高了系统的可靠性,降低维护成本。(The invention provides a protection circuit, which comprises a self-recovery protection circuit, a switch circuit, a protection circuit power supply circuit, a protection signal generation circuit and a protection circuit, wherein the self-recovery protection circuit comprises a first protection circuit, a second protection circuit and a third protection circuit; the end of the direct-current power supply or the direct-current bus V1 is connected with the end of the direct-current power supply or the direct-current bus V2 through a switch circuit, one end of the self-recovery protection circuit is connected with one end of the switch circuit, one end of the self-recovery protection circuit is connected with the other end of the switch circuit, and the switch circuit is connected with the protection circuit; the protection circuit power supply circuit and the protection signal generating circuit are respectively connected with the end of a direct current power supply or a direct current bus V1 and the end of a direct current power supply or a direct current bus V2, and the protection circuit power supply circuit and the protection signal generating circuit are connected with the protection circuit after being connected. By adopting the technical scheme of the invention, the short-circuit protection function is realized, when short circuit occurs, the circuit can be disconnected, and after the fault is eliminated, the power supply of the circuit can be automatically recovered, thereby improving the reliability of the system and reducing the maintenance cost.)

1. A protection circuit, characterized by: the self-recovery protection circuit comprises a self-recovery protection circuit, a switching circuit, a protection circuit power supply circuit, a protection signal generation circuit and a protection circuit;

the end of the direct-current power supply or the direct-current bus V1 is connected with the end of the direct-current power supply or the direct-current bus V2 through a switch circuit, one end of the self-recovery protection circuit is connected with one end of the switch circuit, one end of the self-recovery protection circuit is connected with the other end of the switch circuit, and the switch circuit is connected with the protection circuit;

the protection circuit power supply circuit and the protection signal generating circuit are respectively connected with the end of a direct current power supply or a direct current bus V1 and the end of a direct current power supply or a direct current bus V2, and the protection circuit power supply circuit and the protection signal generating circuit are connected with the protection circuit after being connected.

2. The protection circuit of claim 1, wherein: the self-recovery protection circuit comprises a self-recovery thermistor RT.

3. The protection circuit of claim 2, wherein: one end of the self-recovery thermistor RT is connected with one end of the switch circuit, and the other end of the self-recovery thermistor RT is connected with the other end of the switch circuit and the end of the direct-current power supply or the direct-current bus V2.

4. The protection circuit of claim 3, wherein: the protection circuit power supply circuit comprises a diode D2 and a resistor R2, wherein the diode D2 is connected with a common cathode/anode terminal or two cathodes/anodes, and the protection signal generating circuit comprises a diode D3 which is connected with a common anode/cathode terminal or two anodes/cathodes;

an anode/cathode end of the diode D2, an anode/cathode end of the diode D3 and the other end of the self-recovery thermistor RT, a direct current power supply or a direct current bus V2 end are connected, another anode/cathode end of the diode D2, another anode/cathode end of the diode D3 and a direct current power supply or a direct current bus V1 end are connected, a common anode/cathode end of the diode D2 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with a common anode/cathode end of the diode D3 and a protection circuit.

5. The protection circuit of claim 4, wherein: the protection circuit comprises a voltage regulator tube Z1, a resistor R1, a resistor R3 and a triode Q3, wherein the other end of the resistor R2 is connected with the cathode/anode end of the voltage regulator tube Z1, the anode/cathode end of the voltage regulator tube Z1 is connected with the B pole of the triode Q3 and one end of the resistor R3, the E pole of the triode Q3 and the other end of the resistor R3 are grounded, and the C pole of the triode Q3 is connected with a switch circuit through the resistor R1.

6. The protection circuit of claim 5, wherein: the switch circuit comprises a single-pole double-throw relay RLY, the input end of the single-pole double-throw relay RLY is connected with a direct-current power supply or a direct-current bus V1 end, a normally closed contact of the single-pole double-throw relay RLY is connected with one end of a self-recovery thermistor RT, and a normally open contact of the single-pole double-throw relay RLY is connected with the other end of the self-recovery thermistor RT and the direct-current power supply or direct-current bus V2 end;

one end of the pull-in coil of the single-pole double-throw relay RLY is connected with the common cathode/anode end of the diode D2 and one end of the resistor R2, and the resistor R1 is connected with the other end of the pull-in coil of the single-pole double-throw relay RLY.

7. The protection circuit of claim 5, wherein: the protection circuit comprises a diode D1 with a common cathode/anode terminal or two cathode/anode terminals connected, the resistor R1 is connected with the common cathode/anode terminal of the diode D1, and the two anode/cathode terminals of the diode D1 are connected with the switch circuit.

8. The protection circuit of claim 7, wherein: the switching circuit comprises a transistor Q1, a transistor Q2, a resistor R4 and a resistor R5, wherein the S pole of the transistor Q2 is connected with the end of a direct-current power supply or a direct-current bus V1 and one end of a self-recovery thermistor RT, and the two ends of the resistor R4 are respectively connected with the S pole of the transistor Q2 and the G pole of the transistor Q2; the D pole of the transistor Q2 is connected with the D pole of the transistor Q1, the S pole of the transistor Q1 is connected with the end of a direct current power supply or a direct current bus V2 and the other end of the self-recovery thermistor RT, and the two ends of the resistor R5 are respectively connected with the S pole of the transistor Q1 and the G pole of the transistor Q1;

the G-pole of the transistor Q2 is connected to one anode/cathode terminal of the diode D1, and the other anode/cathode terminal of the diode D1 is connected to the G-pole of the transistor Q1.

9. The protection circuit of claim 5, wherein: the switch circuit comprises a transistor Q2, a resistor R4 and a diode D4, wherein the S pole of the transistor Q2 is connected with the end of a direct current power supply or a direct current bus V1 through a diode D4, the two ends of the resistor R4 are respectively connected with the S pole of the transistor Q2 and the G pole of the transistor Q2, the G pole of the transistor Q2 is connected with the resistor R1, the two ends of the self-recovery thermistor RT are respectively connected with the S pole of the transistor Q2 and the D pole of the transistor Q2, and the D pole of the transistor Q2 is connected with the end of the direct current power supply or the direct current bus V2;

the other anode/cathode terminal of the diode D2 and the other cathode/anode terminal of the diode D3 are connected to one terminal of the self-recovery thermistor RT, the diode D4, and the S terminal of the transistor Q2.

Technical Field

The invention belongs to the technical field of circuits, and particularly relates to a protection circuit.

Background

In ac and dc power supply equipment, power section modularization is becoming a mainstream. In the modular device, a mutual redundancy design of the auxiliary power supply is often adopted, and in the design, when the auxiliary power supply of the module is normal, the auxiliary power supply of the module needs to supply power to the direct current bus, and when the auxiliary power supply of the module fails, the auxiliary power supply of the module needs to take power from the direct current bus. Therefore, the reliability of the direct current bus directly affects the reliability of the whole system, so that the direct current power supply circuit with the short-circuit protection function is necessary, and in the prior art, the direct current bus with the short-circuit protection function has low reliability, cannot be automatically recovered after the fault is eliminated, and has high maintenance cost.

Disclosure of Invention

In view of the above technical problems, the present invention discloses a protection circuit having a short-circuit protection function and higher reliability.

In contrast, the technical scheme adopted by the invention is as follows:

a protection circuit comprises a self-recovery protection circuit, a switch circuit, a protection circuit power supply circuit, a protection signal generation circuit and a protection circuit; the end of the direct-current power supply or the direct-current bus V1 is connected with the end of the direct-current power supply or the direct-current bus V2 through a switch circuit, one end of the self-recovery protection circuit is connected with one end of the switch circuit, one end of the self-recovery protection circuit is connected with the other end of the switch circuit, and the switch circuit is connected with the protection circuit;

the protection circuit power supply circuit and the protection signal generating circuit are respectively connected with the end of a direct current power supply or a direct current bus V1 and the end of a direct current power supply or a direct current bus V2, and the protection circuit power supply circuit and the protection signal generating circuit are connected with the protection circuit after being connected.

Wherein, V1 and V2 are DC power supplies or DC buses. By adopting the technical scheme, various unidirectional/bidirectional short-circuit protection can be realized as required, and when the short-circuit fault is eliminated, the power supply of the circuit can be automatically recovered, so that the reliability of the system is improved, and the use is more convenient.

As a further improvement of the present invention, the self-recovery protection circuit includes a self-recovery thermistor RT.

As a further improvement of the present invention, one end of the self-recovery thermistor RT is connected to one end of the switching circuit, and the other end of the self-recovery thermistor RT is connected to the other end of the switching circuit, the dc power supply, or the dc bus V2.

As a further improvement of the invention, the protection circuit power supply circuit comprises a diode D2 and a resistor R2 which are connected with a common cathode/anode terminal or two cathodes/anodes, and the protection signal generating circuit comprises a diode D3 which is connected with a common anode/cathode terminal or two anodes/cathodes;

an anode/cathode end of the diode D2, an anode/cathode end of the diode D3 and the other end of the self-recovery thermistor RT, a direct current power supply or a direct current bus V2 end are connected, another anode/cathode end of the diode D2, another anode/cathode end of the diode D3 and a direct current power supply or a direct current bus V1 end are connected, a common anode/cathode end of the diode D2 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with a common anode/cathode end of the diode D3 and a protection circuit.

As a further improvement of the invention, the protection circuit comprises a voltage regulator tube Z1, a resistor R1, a resistor R3 and a triode Q3, wherein the other end of the resistor R2 is connected with the cathode/anode end of the voltage regulator tube Z1, the anode/cathode end of the voltage regulator tube Z1 is connected with the B electrode of the triode Q3 and one end of the resistor R3, the E electrode of the triode Q3 and the other end of the resistor R3 are grounded, and the C electrode of the triode Q3 is connected with the switch circuit through the resistor R1.

As a further improvement of the invention, the switch circuit comprises a single-pole double-throw relay RLY, the input end of the single-pole double-throw relay RLY is connected with a direct-current power supply or a direct-current bus V1 end, the normally closed contact of the single-pole double-throw relay RLY is connected with one end of the self-recovery thermistor RT, and the normally open contact of the single-pole double-throw relay RLY is connected with the other end of the self-recovery thermistor RT, the direct-current power supply or a direct-current bus V2 end;

one end of the pull-in coil of the single-pole double-throw relay RLY is connected with the common cathode/anode end of the diode D2 and one end of the resistor R2, and the resistor R1 is connected with the other end of the pull-in coil of the single-pole double-throw relay RLY.

As a further improvement of the present invention, the protection circuit includes a diode D1 connected to a common cathode/anode terminal or two cathode/anode terminals, the resistor R1 is connected to the common cathode/anode terminal of the diode D1, and the two anode/cathode terminals of the diode D1 are connected to the switching circuit.

As a further improvement of the present invention, the switch circuit includes a transistor Q1, a transistor Q2, a resistor R4 and a resistor R5, the S-pole of the transistor Q2 is connected to the dc power supply or dc bus V1 end and one end of the self-recovery thermistor RT, and the two ends of the resistor R4 are respectively connected to the S-pole of the transistor Q2 and the G-pole of the transistor Q2; the D pole of the transistor Q2 is connected with the D pole of the transistor Q1, the S pole of the transistor Q1 is connected with the end of a direct current power supply or a direct current bus V2 and the other end of the self-recovery thermistor RT, and the two ends of the resistor R5 are respectively connected with the S pole of the transistor Q1 and the G pole of the transistor Q1;

the G-pole of the transistor Q2 is connected to one anode/cathode terminal of the diode D1, and the other anode/cathode terminal of the diode D1 is connected to the G-pole of the transistor Q1.

As a further improvement of the present invention, the switch circuit includes a transistor Q2, a resistor R4, and a diode D4, wherein the S-pole of the transistor Q2 is connected to the dc power supply or dc bus V1 through the diode D4, the two ends of the resistor R4 are connected to the S-pole of the transistor Q2 and the G-pole of the transistor Q2, respectively, the G-pole of the transistor Q2 is connected to the resistor R1, the two ends of the self-recovery thermistor RT are connected to the S-pole of the transistor Q2 and the D-pole of the transistor Q2, respectively, and the D-pole of the transistor Q2 is connected to the dc power supply or dc bus V2;

the other anode/cathode terminal of the diode D2 and the other cathode/anode terminal of the diode D3 are connected to one terminal of the self-recovery thermistor RT, the diode D4, and the S terminal of the transistor Q2.

Compared with the prior art, the invention has the beneficial effects that:

by adopting the technical scheme of the invention, the direct current bus has high reliability and a short-circuit protection function, when a direct current power supply or the direct current bus is short-circuited, the circuit can be disconnected, and when the short-circuit fault is eliminated, the power supply of the circuit can be automatically recovered, thereby improving the reliability of the system and reducing the maintenance cost.

Drawings

Fig. 1 is a circuit diagram of a protection circuit according to embodiment 1 of the present invention.

Fig. 2 is a circuit diagram of a protection circuit according to embodiment 2 of the present invention.

Fig. 3 is a circuit diagram of a protection circuit according to embodiment 3 of the present invention.

Fig. 4 is a circuit diagram of a protection circuit according to embodiment 4 of the present invention.

Fig. 5 is a circuit diagram of a protection circuit according to embodiment 5 of the present invention.

Fig. 6 is a circuit diagram of a protection circuit according to embodiment 6 of the present invention.

Detailed Description

Preferred embodiments of the present invention are described in further detail below.

A protection circuit comprises a self-recovery protection circuit, a switch circuit, a protection circuit power supply circuit, a protection signal generation circuit and a protection circuit; the end of the direct-current power supply or the direct-current bus V1 is connected with the end of the direct-current power supply or the direct-current bus V2 through a switch circuit, one end of the self-recovery protection circuit is connected with one end of the switch circuit, one end of the self-recovery protection circuit is connected with the other end of the switch circuit, and the switch circuit is connected with the protection circuit; the protection circuit power supply circuit and the protection signal generating circuit are respectively connected with the end of a direct current power supply or a direct current bus V1 and the end of a direct current power supply or a direct current bus V2, and the protection circuit power supply circuit and the protection signal generating circuit are connected with the protection circuit after being connected. The following description is given with reference to preferred embodiments.