CN2919641Y

CN2919641Y - DC power supply surging suppresser

Info

Publication number: CN2919641Y
Application number: CN 200620028859
Authority: CN
Inventors: 张学明
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2006-06-02
Filing date: 2006-06-02
Publication date: 2007-07-04
Anticipated expiration: 2016-06-02

Abstract

The utility model relates to a DC power surge suppressor, containing a surge voltage sampling circuit, a voltage clamp circuit, an over-voltage switching circuit, a solid-state relay and a shell. After electrifying, the sampling circuit of the surge voltage proceeds timely sampling on changes of the power supply voltage. As signal voltage exceeds the threshold value of voltage clamp circuit; when the over-voltage switch circuit conducts, and the control input end of the solid state relay closes to ''0 V'' potential, then the solid state relay ends, thereby protecting the subsystem device; after surging, the sampling voltage of the surge voltage sampling circuit is lower than the threshold value of the voltage clamp circuit, then the over-voltage switch ends and solid-state relay conducts, therefore the subsystem is in normal power supply. Due to the use of separate components connection structure to achieve the protection function in the DC Power System. The utility model has improved the anti-attack ability of the system to protect the subsystem device; after surge, the subsystem device supplies power normally and rapidly. The utility model is economic, safe and practical.

Description

DC power supply surge suppressor

Technical field

The utility model DC power supply surge suppressor belongs to power technique fields.

Background technology

For the high-current dc power supply electric power system; when a plurality of subsystems are powered; when a certain big electric current subsystem is stopped power supply suddenly; after packing up undercarriage when aircraft; will produce the power surge signal of 40V～80V on the general supply circuit; this signal duration is in the scope of 10ms～100ms; this surge voltage is quite unfavorable for the operate as normal of each subsystem; can directly puncture the electronic device of the power-supply system or the subsystem of subsystem when serious; the damage that causes subsystem to recover; the utility model power surge inhibitor; be in order to solve: when surge took place, the power surge inhibitor can play a protective role to subsystem, after surge; subsystem continues operate as normal, thereby avoids economic loss.

From the present world and home products, AC power such as AC220V 50Hz AC power protector are arranged, this series products is mainly used on the civil electric appliance; And the DC power supply protector does not form the product appearance; when industry and military upward DC power supply work; a lot of subsystems are by the impact resistance of power-supply system self; have plenty of and when surge arrives, cut off the subsystem power supply automatically; surge subsystem later can not recover operate as normal automatically; when needing to power on to subsystem once more, subsystem is operate as normal again, and certain defective is arranged.

Summary of the invention

The purpose of this utility model is in order to overcome the defective of prior art; a kind of DC power supply surge suppressor is provided; when the DC power system unloading of big current system produces surge; the power surge inhibitor is to just realizing defencive function in the subsystem of operate as normal; after the surge, recover normal power supply automatically.

The utility model DC power supply surge suppressor comprises surge voltage sample circuit, voltage clamping circuit, overpressure switch circuit, solid-state relay.Dc power anode a receives surge voltage sample circuit A1, overpressure switch circuit E1 and solid-state relay input G1 respectively; Dc power cathode b receives surge voltage sample circuit A2, overpressure switch circuit E3, solid-state relay signal ground end G3 and power supply output earth terminal d respectively; Surge voltage sample circuit output B1 is connected to voltage clamping circuit input C1; Voltage clamping circuit output D1 is connected to overpressure switch circuit input end E1; Overpressure switch circuit output end G1 is connected to solid-state relay input G2; Solid-state relay output H1 is connected to power output terminal c.

The working procedure of power surge inhibitor is that system's DC power supply directly is not connected with subsystem, but be connected with subsystem through the power surge inhibitor, after the energising, the surge voltage sample circuit is taken a sample to the variation of supply voltage in good time, when the number of winning the confidence voltage when surpassing the threshold value of voltage clamping circuit, the overpressure switch circuit turn-on, the control input end of solid-state relay is near " 0V " current potential, solid-state relay ends, and enters subsystem thereby blocked high pressure, has protected subsystem equipment; After surge, surge voltage sample circuit institute sampling voltage is lower than the threshold value of voltage clamping circuit, and overpressure switch is ended, and the solid-state relay input control signal satisfies the driving requirement, the solid-state relay conducting, and subsystem obtains normal power supply.

Among Fig. 1, DC power supply is by a, b input, and c, d export; When on system power supply a, the b surge voltage being arranged, solid-state relay ends, c, d no-output; Thereby realized defencive function.After surge, the solid-state relay conducting, c, d normally export.

The utility model has the advantages that:, make the utility model be supported in DC power system and realize defencive function owing to adopt the structure of separating component overlap joint.

The utility model has been filled up a blank, is applicable to a lot of occasions of using DC power system in industry, the military affairs.Improve the impact resistance of system, protected subsystem equipment; After surge,, the rapid normal power supply of subsystem.Economy, safety, practicality.

Description of drawings:

Fig. 1 is a structural representation of the present utility model, also is Figure of abstract.

Fig. 2 is a scheme of installation of the present utility model,

Fig. 3 is physical circuit figure of the present utility model,

Embodiment

Embodiment of the present utility model is as depicted in figs. 1 and 2: be surge voltage sample circuit 1, voltage clamping circuit 2, overpressure switch circuit 3, solid-state relay 4, casing 5 among Fig. 1.

For example: we have tried out the power surge inhibitor in the direct current 28V power-supply system on drone, have solved this problem.Circuit diagram is realized defencive function as shown in Figure 3 when circuit diagram is set supply voltage above 35V.

Aircraft power supply by a (+28V); b () input; R1 (11K Ω); R2 (11K Ω) and three resistance of R3 (5.1K Ω) are taken a sample from power supply; the voltage of R3 is sampling voltage; when sampling voltage surpasses the base stage point pressure sum of clamp voltage stabilizing didoe D1 (6.2V) and overpressure switch transistor (BD681); this moment, surge voltage appearred in power supply; the triode conducting; series resistance R4 (1K Ω); voltage on the R6 among R5 (1K Ω) and the R6 (1K Ω) is 0V; solid-state relay JD (D1D20) ends; the surge power supply is cut off; c; the d no-output has realized defencive function.After surge, triode ends, and relay J D provides drive signal by R4, R5, R6, the relay conducting, and c, d have normal power source output.R1 and R2 series connection and R4 and R5 are connected on and consider the function assignment problem here, avoid resistance overheated.Set in the circuit diagram when surge voltage surpasses 35V and realize defencive function,,, can adjust the reference value of protection voltage by adjusting the proportionate relationship of R3 and R1, R2 according to actual conditions.

Claims

1, DC power supply surge suppressor is characterized in that this DC power supply surge suppressor comprises surge voltage sample circuit (1), voltage clamping circuit (2), overpressure switch circuit (3), solid-state relay (4), casing (5);

The static annexation of each several part: dc power anode a receives the A1 of surge voltage sample circuit (1), the E1 of overpressure switch circuit (3) and the input G1 of solid-state relay (4) respectively; Dc power cathode b receives the A2 of surge voltage sample circuit (1), E3, solid-state relay (4) signal ground end G3 and the power supply output earth terminal d of overpressure switch circuit (3) respectively; Surge voltage sample circuit output B1 is connected to the input C1 of voltage clamping circuit (2); Voltage clamping circuit output D1 is connected to overpressure switch circuit input end E1; Overpressure switch circuit output end G1 is connected to solid-state relay input G2; Solid-state relay output H1 is connected to power output terminal c;

Dynamic annexation: DC power supply is by a, b input, and c, d export, and when on system power supply a, the b surge voltage being arranged, solid-state relay ends, c, d no-output, thus realized defencive function; After surge, the solid-state relay conducting, c, d normally export.

2, according to the described DC power supply surge suppressor of claim 1, it is characterized in that,, can adjust the predetermined reference value of protection voltage by adjusting the proportionate relationship of R3 and R1, R2 according to actual conditions.

3, according to the described DC power supply surge suppressor of claim 1, it is characterized in that in circuit design, avoiding the overheated consideration function of resistance assignment problem, in circuit design, take R1 and R2 series connection and R4 and R5 series connection.