CN110635673A

CN110635673A - Buffer circuit suitable for high-power supply charging and discharging

Info

Publication number: CN110635673A
Application number: CN201910850060.5A
Authority: CN
Inventors: 陈海军; 程何小; 叶明珠
Original assignee: 715th Research Institute of CSIC
Current assignee: 715th Research Institute of CSIC
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2019-12-31

Abstract

The invention discloses a buffer circuit suitable for charging and discharging of a high-power supply, which mainly comprises a charging circuit, a discharging circuit and a control circuit, wherein the main circuit of the charging circuit of a capacitor C consists of contactors KM1, KM2 and a resistor R, the main circuit of the discharging circuit of the capacitor C consists of a contactor KM3 and a resistor R, and the control circuit of the charging and discharging circuit of the capacitor C consists of contactor coils KM1, KM2 and KM 3; the time delay t1 of the time relay KT1 is used for controlling the action of a contactor KM1, the time delay module KM1-DT time delay t0 of the contactor KM1 is used for controlling the action of a contactor KM2, and the time delay t2 of the time relay KT2 is used for controlling the action of a contactor KM 3. The charging and discharging buffer circuit adopts a circuit framework sharing the same resistor, reduces the number of devices of the buffer circuit resistor, releases the installation space of a plurality of resistors in the independent system of the charging and discharging buffer circuit, improves the integration level through reasonable time sequence control, and reduces the cost to a certain extent.

Description

Buffer circuit suitable for high-power supply charging and discharging

Technical Field

The invention relates to the field of high-power supplies, in particular to a buffer circuit suitable for charging and discharging of a high-power supply.

Background

In a high-power energy storage power supply, the capacity of a filter capacitor is large, the output voltage of the power supply is also high, when the capacitor is directly charged and discharged, the impact current is large, an RC circuit is generally adopted to realize a buffering effect, and the charging circuit and the discharging circuit are widely used at present and adopt independent RC circuit frameworks. The power, volume and cost of the buffer resistor are high. The charging circuit and the discharging circuit share one resistor, so that the respective normal work of the circuits can be ensured, the use number of devices can be reduced to a certain degree, and the miniaturization of equipment can be realized.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a buffer circuit suitable for charging and discharging of a high-power supply.

The object of the present invention is achieved by the following technical means. A buffer circuit suitable for charging and discharging of a high-power supply mainly comprises a charging circuit, a discharging circuit and a control circuit, wherein the main circuit of the charging circuit of a capacitor C consists of contactors KM1, KM2 and a resistor R, the main circuit of the discharging circuit of the capacitor C consists of a contactor KM3 and a resistor R, the control circuit of the charging and discharging circuit of the capacitor C consists of contactor coils KM1, KM2, KM3, time relay coils KT1 and KT2, contactor normally-closed auxiliary contacts KM1, KM2 and KM3, time relay normally-open auxiliary contacts KT1 and KT2, a contactor delay module KM1-DT, a fuse FU-B and a button switch SB, and the buffer circuit adopts modularized time relays KT1, KT2 and a delay module KM1-DT for inhibiting mutual influence of actions of the contactors KM1, KM2 and KM3, so that each operation has an inherent delay of t1, t0 and t, t2, and making the contactors KM1, KM2 and KM3 in an interlocking relationship, and making the contactors KM1 and KM2 in a self-locking relationship; the time delay t1 of the time relay KT1 is used for controlling the action of a contactor KM1, the time delay module KM1-DT time delay t0 of the contactor KM1 is used for controlling the action of a contactor KM2, and the time delay t2 of the time relay KT2 is used for controlling the action of a contactor KM 3.

Furthermore, a charging circuit of the capacitor C adopts a modularized time relay KT1 and a time delay module KM1-DT for inhibiting the mutual influence of the contactors KM1 and KM2 during action, so that each operation has inherent time delay of t1 and t0 respectively; the time delay t1 of the time relay KT1 is used for controlling the action of a contactor KM1, and the time delay module KM1-DT time delay t0 of the contactor KM1 is used for controlling the action of a contactor KM 2; during charging, the contactor KM3 is in an off state, the contactor KM1 is attracted after the time delay of t1 by the time relay KT1, the contactor KM2 is attracted after the time delay of t0 by the time delay module KM1-DT of the contactor KM1, and only the contactors KM1 and KM2 are kept in an attraction state at the moment.

Furthermore, a modular time relay KT2 is adopted by a discharging circuit of the capacitor C and is used for inhibiting mutual influence when the contactor KM3 acts, so that an inherent delay t2 exists in each operation, wherein the delay t2 of the time relay KT2 is used for controlling the action of the contactor KM 3; during discharging, the contactors KM1 and KM2 are both in an off state at the same time, the contactor KM3 is attracted after a time delay t2 of a time relay KT2, and only the contactor KM3 keeps in an attraction state at the moment.

Furthermore, the output ends of the charging circuit and the discharging circuit are connected in series with the fuse FU-A.

The invention has the beneficial effects that: a self-locking and interlocking control circuit of a contactor is adopted; the control time sequence of the action of the contactor of the charging and discharging slow starting circuit is analyzed, and the sharing of the resistors in the charging and discharging circuit is realized; the using number of resistors of the charging and discharging buffer circuit is reduced; the volume of the charging and discharging buffer circuit is reduced; the cost of the charging and discharging buffer circuit is reduced, and the integration level is improved.

Drawings

FIG. 1 is a schematic diagram of a general charging/discharging slow start circuit topology.

FIG. 2 is a schematic diagram of a charging/discharging slow start circuit topology according to the present invention.

Fig. 3 is a schematic diagram of charging.

Fig. 4 is a schematic discharge diagram.

Fig. 5 is a control diagram of the contactor and the time relay.

Detailed Description

The invention will be described in detail with reference to the following figures and examples:

as shown in figure 2, the buffer circuit suitable for charging and discharging of the high-power supply mainly comprises a charging circuit, a discharging circuit and a control loop, wherein the rectifying circuit part is electrically connected with the charging circuit and the discharging circuit, and the output ends of the charging circuit and the discharging circuit are connected with a fuse FU-A in series.

1. Charge timing design

A main circuit of a charging circuit of the capacitor C consists of a contactor KM1, a contactor KM2 and a resistor R, a modularized time relay KT1 and a delay module KM1-DT are designed through delay design in a strict time sequence control flow, and a control circuit is shown in detail in figure 5. The device is used for inhibiting the mutual influence of the actions of the contactors KM1 and KM2, so that each operation has inherent delay of t1 and t0 respectively. The time delay t1 of the time relay KT1 is used for controlling the action of the contactor KM1, and the time delay module KM1-DT time delay t0 of the contactor KM1 is used for controlling the action of the contactor KM 2.

During charging, the contactor KM3 is in an off state, the contactor KM1 is attracted after the time delay of t1 by the time relay KT1, the contactor KM2 is attracted after the time delay of t0 by the time delay module KM1-DT of the contactor KM1, and only the contactors KM1 and KM2 are kept in an attraction state at the moment. See fig. 3 for details: the contactors KM1, KM2 and KM3 are interlocked, and the contactors KM1 and KM2 are self-locked.

2. Discharge timing design

A main circuit of a discharging circuit of the capacitor C consists of a contactor KM3 and a resistor R, a modularized time relay KT2 is designed by delay design in a strict time sequence control flow, and the detailed control circuit is shown in FIG. 5. The device is used for inhibiting the mutual influence of the action of the contactor KM3, so that each operation has an inherent delay time of t 2. The time delay t2 of the time relay KT2 is used for controlling the action of the contactor KM 3.

During discharging, the contactors KM1 and KM2 are both in an off state at the same time, the contactor KM3 is attracted after a time delay t2 of a time relay KT2, and only the contactor KM3 keeps in an attraction state at the moment. See fig. 4 for details: the contactors KM1, KM2 and KM3 are interlocked, and the contactors KM1 and KM2 are self-locked.

3. Contactor and time relay control design

The control loop of the charging and discharging circuit of the capacitor C consists of contactor coils KM1, KM2 and KM3, time relay coils KT1 and KT2, contactor normally closed auxiliary contacts KM1, KM2 and KM3, time relay normally open auxiliary contacts KT1 and KT2, a contactor delay module KM1-DT, a fuse FU-B and a button switch SB (note: 1 normally open contact and 1 normally closed contact), and the control loop is shown in detail in FIG. 5. Through the time delay design in the strict time sequence control flow, modular time relays KT1 and KT2 and a time delay module KM1-DT are designed and used for inhibiting mutual influence of the contactors KM1, KM2 and KM3 during action, so that one inherent time delay is respectively t1, t0 and t2 in each operation. The time delay t1 of the time relay KT1 is used for controlling the action of a contactor KM1, the time delay module KM1-DT time delay t0 of the contactor KM1 is used for controlling the action of a contactor KM2, and the time delay t2 of the time relay KT2 is used for controlling the action of a contactor KM 3.

Test results

Under the condition of a laboratory, the circuit is tested, and a modularized time relay and a time delay module are designed through time delay design in a strict time sequence control flow. The contactors KM1, KM2 and KM3 adopt interlocking and self-locking control relation, so that a circuit framework of a resistor shared by charging and discharging circuits is realized, the use number of devices is greatly reduced, the equipment volume is reduced, and the cost is reduced to a certain extent. The circuit is suitable for a high-power energy storage power supply, and the effect is more obvious when the power supply power is larger.

It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.

Claims

1. The utility model provides a buffer circuit suitable for high-power supply charge-discharge which characterized in that: the charging circuit main loop of the capacitor C consists of contactors KM1, KM2 and a resistor R, the discharging circuit main loop of the capacitor C consists of a contactor KM3 and a resistor R, the control loop of the charging circuit and the discharging circuit of the capacitor C consists of contactor coils KM1, KM2 and KM3, time relay coils KT1 and KT2, contactor normally closed auxiliary contacts KM1, KM2 and KM3, time relay normally open auxiliary contacts KT1 and KT2, contactor delay modules KM 1-6959-DT, fuses FU-B and a button switch SB, and the modularized time relays KT2 and KT2 and the delay modules KM1-DT are adopted for inhibiting the mutual influence during the actions of the contactors KM1, KM2 and KM3, so that one inherent delay time is respectively t1 and t0 in each operation and the contactors KM 0 and KM 0 are in an interlocking relationship, the contactor KM1 and KM2 are in a self-locking relationship; the time delay t1 of the time relay KT1 is used for controlling the action of a contactor KM1, the time delay module KM1-DT time delay t0 of the contactor KM1 is used for controlling the action of a contactor KM2, and the time delay t2 of the time relay KT2 is used for controlling the action of a contactor KM 3.

2. The snubber circuit suitable for charging and discharging a high power supply according to claim 1, wherein: the charging circuit of the capacitor C adopts a modularized time relay KT1 and a time delay module KM1-DT for inhibiting the mutual influence of the contactors KM1 and KM2 during action, so that each operation has inherent time delay of t1 and t0 respectively; the time delay t1 of the time relay KT1 is used for controlling the action of a contactor KM1, and the time delay module KM1-DT time delay t0 of the contactor KM1 is used for controlling the action of a contactor KM 2; during charging, the contactor KM3 is in an off state, the contactor KM1 is attracted after the time delay of t1 by the time relay KT1, the contactor KM2 is attracted after the time delay of t0 by the time delay module KM1-DT of the contactor KM1, and only the contactors KM1 and KM2 are kept in an attraction state at the moment.

3. The snubber circuit suitable for charging and discharging a high power supply according to claim 1, wherein: a discharging circuit of the capacitor C adopts a modularized time relay KT2 and is used for inhibiting the mutual influence when the contactor KM3 acts, so that an inherent delay t2 exists in each operation, wherein the delay t2 of the time relay KT2 is used for controlling the action of the contactor KM 3; during discharging, the contactors KM1 and KM2 are both in an off state at the same time, the contactor KM3 is attracted after a time delay t2 of a time relay KT2, and only the contactor KM3 keeps in an attraction state at the moment.

4. The snubber circuit suitable for charging and discharging a high power supply according to claim 1, wherein: the output ends of the charging circuit and the discharging circuit are connected in series with a fuse FU-A.