CN203119452U

CN203119452U - A DC power output protection circuit

Info

Publication number: CN203119452U
Application number: CN 201320031543
Authority: CN
Inventors: 张炳岩; 刘泉生; 杨静波; 王燕玲; 原超
Original assignee: HEFEI TONGZHI ELECTRICAL CONTROL TECHNOLOGY Co Ltd; 63963 TROOPS PLA
Current assignee: 63963 Troops,PLA; HEFEI TONGZHI ELECTRICAL CONTROL TECHNOLOGY CO., LTD.
Priority date: 2013-01-21
Filing date: 2013-01-21
Publication date: 2013-08-07
Anticipated expiration: 2023-01-21

Abstract

The utility model relates to electromechanical control technical field and especially relates to a DC power output protection circuit. An output protection circuit is arranged between a DC power supply and an execution circuit. The arrangement of the output protection circuit resolves problems of instant impact current and incapable immediate disconnection and guarantees the reliability of DC power output.

Description

The DC power supply output protection circuit

Technical field

The utility model relates to the Electromechanical Control technical field, particularly a kind of DC power supply output protection circuit.

Background technology

In the electrical system, when DC power supply was powered to executive circuit, for guaranteeing the stability of DC power supply, common way was to be parallel with large bulk capacitance at input.Though the stability that electric capacity has guaranteed DC power supply is set, also can produces following problem:

DC power supply rigidly connects when leading to, and can cause the electric capacity charging, produces the moment impact electric current, can cause the components and parts in the executive circuit to damage because of big electric current; When DC power supply was turn-offed, because the existence of electric capacity, can cause controlling power supply can't disconnect immediately.So all can influence the reliability of DC power supply.

The utility model content

The purpose of this utility model is to provide a kind of DC power supply output protection circuit, increases the output reliability of DC power supply.

For reaching above effect, the technical solution adopted in the utility model is: a kind of DC power supply output protection circuit is provided with output protection circuit between DC power supply and executive circuit.

Compared with prior art, there is following technique effect in the utility model:

The setting of output protection circuit, the problem that solve the moment impact electric current, can't turn-off has immediately guaranteed the reliability that DC power supply is exported.

Description of drawings

Fig. 1 is principle schematic of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model;

Fig. 3 is K switch 1 attracting state circuit theory diagrams among Fig. 2;

Fig. 4 is K switch 1 off-state circuit theory diagrams among Fig. 2.

Embodiment

Below in conjunction with Fig. 1 to Fig. 4, the utility model done being described in further detail:

Consult Fig. 1, Fig. 2; a kind of DC power supply output protection circuit; 30 of DC power supply 10 and executive circuits are provided with output protection circuit 20; the output head anode of DC power supply 10 is as the input anode of output protection circuit 20; be the Vin shown in Fig. 2; the input anode of executive circuit 30 is as the output head anode of output protection circuit 20, i.e. Vout shown in Fig. 2.In the present embodiment; described output protection circuit 20 comprises relay J 1; the tip side 1 of described relay J 1; 2 respectively with the output head anode of DC power supply 10; the input anode of executive circuit 30 links to each other; line Bao Yiduan 3 ends of relay J 1 link to each other with the positive pole of electrochemical capacitor C1; the line bag other end 4 of relay J 1 and the minus earth of electrochemical capacitor C1; resistance R 3 with after light-emitting diode H1 connects again with electrochemical capacitor C2; the C3 parallel connection; electrochemical capacitor C2; the positive pole of C3; one end of resistance R 3 links to each other and links to each other with the tip side 2 of relay J 1; electrochemical capacitor C2; the negative pole of C3; the negative pole of light-emitting diode H1 links to each other and ground connection; the tip side 2 of relay J 1; line bag end 3 is respectively by resistance R 2; the A of R1 and double-point double-throw switch K1; A ' end links to each other; the B of double-point double-throw switch K1; B ' end links to each other the C of double-point double-throw switch K1 with the tip side 1 of relay J 1; C ' holds ground connection.The residing position of double-point double-throw switch K1 shown in Fig. 2 is off-state.

Below the principle of this circuit is narrated:

Consult Fig. 3, during double-point double-throw switch K1 adhesive, its A, A ' end link to each other with B, B ' end, DC power supply 10 is by 1 pair of electrochemical capacitor C1 charging of resistance R, by the electrochemical capacitor C2 of R2, C3 charging, back relay J1 adhesive is communicated with DC power supply 10 and executive circuit 30, light-emitting diode H1 is bright, plays indicative function.As the electrochemical capacitor C1 of Vin, C2, when C3 charges, by the metering function of resistance R 1 and R2, reduce the moment impact electric current of circuit.

Consult Fig. 4, when double-point double-throw switch K1 disconnected, its A, A ' end linked to each other with C, C ' end, and electrochemical capacitor C1 is connected to ground connection discharge by resistance R 1, and when guaranteeing that switch disconnects, relay J 1 disconnects fast, cuts off being connected of DC power supply 10 and executive circuit 30.Electrochemical capacitor C2, C3 discharge by resistance R 2 ground connection simultaneously, output protection circuit 20 no-output voltages when guaranteeing double-point double-throw switch K1 disconnection, and indicator light extinguishes fast simultaneously.

Claims

1. a DC power supply output protection circuit is characterized in that: be provided with output protection circuit (20) between DC power supply (10) and executive circuit (30).

2. DC power supply output protection circuit as claimed in claim 1; it is characterized in that: described output protection circuit (20) comprises relay J 1; the tip side 1 of described relay J 1; 2 respectively with the output head anode of DC power supply (10); the input anode of executive circuit (30) links to each other; the line Bao Yiduan 3 of relay J 1 links to each other with the positive pole of electrochemical capacitor C1; the line bag other end 4 of relay J 1 and the minus earth of electrochemical capacitor C1; resistance R 3 with after light-emitting diode H1 connects again with electrochemical capacitor C2; the C3 parallel connection; electrochemical capacitor C2; the positive pole of C3; one end of resistance R 3 links to each other and links to each other with the tip side 2 of relay J 1; electrochemical capacitor C2; the negative pole of C3; the negative pole of light-emitting diode H1 links to each other and ground connection; the tip side 2 of relay J 1; line bag end 3 is respectively by resistance R 2; the A of R1 and double-point double-throw switch K1; A ' end links to each other; the B of double-point double-throw switch K1; B ' end links to each other the C of double-point double-throw switch K1 with the tip side 1 of relay J 1; C ' holds ground connection.