CN206461340U - A kind of DC over-voltage protection circuit - Google Patents

Abstract

The utility model discloses a kind of DC over-voltage protection circuit; including load RL, relay J, triode VT1, resistance R1, diode D1 and one-way SCR VS; described resistance R1 one end connects power supply VCC, load RL, relay J coils and triode VT1 colelctor electrodes respectively; load RL other ends connection grounding relay J contact J 1; relay J coil other end connecting triode VT2 colelctor electrodes; triode VT2 grounded emitters; triode VT2 base stages connect resistance R3, and the resistance R3 other ends connect ground capacity C1 and diode D3 negative poles respectively.The utility model DC over-voltage protection circuit, coordinates one-way SCR and relay as control using triode, when over-voltage fault occurs in power supply VCC, automatically cuts off load RL and powers, circuit structure is simple, and cost is low, small volume, applied widely.

Description

A kind of DC over-voltage protection circuit

Technical field

The utility model is related to a kind of protection circuit, specifically a kind of DC over-voltage protection circuit.

Background technology

With the popularization of present electrical equipment, revolutionary change is brought to industrial and agricultural production, Defence business, science and technology, The development of society is accelerated, people have stepped into Electrification Age, have also been greatly improved the quality of life of people, Increasingly it be unable to do without these electric equipments.With the development of science and technology, the precision of electric equipment is also gradually stepped up, it there occurs to overturn the heavens and cover The change on ground, but the not interfered by outside of these electric equipments how is protected, the master paid close attention into current development in science and technology Want problem.The power network of current China is popularized, and huge network system has given us many convenience.But with access power network User increase, and consumer electronics variation, also result in the unstable of line voltage, voltage fluctuated, also into Damage the principal element of electric equipment.How electrical equipment is protected when voltage change is larger, studied now into people One direction.Prior art uses single-chip microcomputer control, provides sampled signal to single-chip microcomputer by voltage sample module, realizes overvoltage Control, not only control algolithm is complicated, and price is high.

Utility model content

The purpose of this utility model is to provide a kind of DC over-voltage protection circuit, to solve to propose in above-mentioned background technology The problem of.

To achieve the above object, the utility model provides following technical scheme：

A kind of DC over-voltage protection circuit, including load RL, relay J, triode VT1, resistance R1, diode D1 and list To controllable silicon VS, described resistance R1 one end connects power supply VCC, load RL, relay J coils and triode VT1 colelctor electrodes respectively, Load RL other ends connection grounding relay J contact J-1, relay J coil other end connecting triode VT2 colelctor electrodes, three poles Pipe VT2 grounded emitters, triode VT2 base stages connection resistance R3, the resistance R3 other ends connect ground capacity C1 and two poles respectively Pipe D3 negative poles, diode D3 positive poles difference connecting triode VT1 emitter stages and resistance R4, resistance the R4 other end connection diode D2 Positive pole, diode D2 negative poles connection one-way SCR VS G poles, one-way SCR VS K poles connection ground connection light emitting diode LED1 positive poles, one-way SCR VS A poles connect resistance R2 and diode D1 negative poles, diode D1 positive poles connection resistance R1 respectively The other end, resistance R2 other end connecting triode VT1 base stages.

It is used as the utility model further scheme：The relay J contacts J-1 is normally-closed contact.

Compared with prior art, the beneficial effects of the utility model are：The utility model DC over-voltage protection circuit, is used Triode coordinates one-way SCR and relay as control, when over-voltage fault occurs in power supply VCC, automatically cuts off load RL Power supply, circuit structure is simple, and cost is low, small volume, applied widely.

Brief description of the drawings

Fig. 1 is the circuit diagram of DC over-voltage protection circuit.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belongs to the scope of the utility model protection.

Referring to Fig. 1, in the utility model embodiment, a kind of DC over-voltage protection circuit, including load RL, relay J, Triode VT1, resistance R1, diode D1 and one-way SCR VS, described resistance R1 one end connect respectively power supply VCC, load RL, Relay J coils and triode VT1 colelctor electrodes, load RL other end connection grounding relay J contact J-1, relay J coils are another One end connecting triode VT2 colelctor electrodes, triode VT2 grounded emitters, triode VT2 base stages connection resistance R3, resistance R3 is another One end connects ground capacity C1 and diode D3 negative poles, diode D3 positive poles difference connecting triode VT1 emitter stages and electricity respectively R4 is hindered, resistance R4 other ends connection diode D2 positive poles, diode D2 negative poles connection one-way SCR VS G poles are unidirectional controllable The silicon VS K poles connection ground connection positive pole of LED 1, one-way SCR VS A poles connect resistance R2 and diode D1 respectively Negative pole, the diode D1 positive poles connection resistance R1 other ends, resistance R2 other end connecting triode VT1 base stages；The relay J is touched Point J-1 is normally-closed contact.

Operation principle of the present utility model is：Referring to Fig. 1, during power supply VCC normal works, by setting resistance R1 and electricity R2 value is hindered, makes triode VT1 just at cut-off state, one-way SCR VS G poles can not obtain trigger pulse, unidirectionally may be used Silicon VS cut-offs are controlled, triode VT2 is also at cut-off state, and relay J does not work, and now loads RL normal works；As power supply VCC During generation over-voltage fault, triode VT1 conductings, one-way SCR VS conductings, LED lights, and indicates over-voltage fault, Triode VT2 conductings simultaneously, relay J coil adhesives, its normally-closed contact J-1 disconnects, and load RL is stopped, and plays over-pressed guarantor The effect of shield.

In summary, the utility model DC over-voltage protection circuit, coordinates one-way SCR and relay using triode Device is as control, when over-voltage fault occurs in power supply VCC, automatically cuts off load RL and powers, circuit structure is simple, and cost is low, body Product is small, applied widely.

Claims (2)

1. a kind of DC over-voltage protection circuit, including load RL, relay J, triode VT1, resistance R1, diode D1 and unidirectional Controllable silicon VS, it is characterised in that described resistance R1 one end connects power supply VCC, load RL, relay J coils and triode respectively VT1 colelctor electrodes, load RL other end connection grounding relay J contact J-1, relay J coil other end connecting triode VT2 collection Electrode, triode VT2 grounded emitters, triode VT2 base stages connection resistance R3, the resistance R3 other ends connect ground capacity respectively C1 and diode D3 negative poles, diode D3 positive poles difference connecting triode VT1 emitter stages and the connection of resistance R4, resistance the R4 other end Diode D2 positive poles, diode D2 negative poles connection one-way SCR VS G poles, one-way SCR VS K poles connection ground connection is luminous The positive pole of diode (LED) 1, one-way SCR VS A poles connect resistance R2 and diode D1 negative poles, the connection of diode D1 positive poles respectively The resistance R1 other ends, resistance R2 other end connecting triode VT1 base stages.

2. DC over-voltage protection circuit according to claim 1, it is characterised in that the relay J contacts J-1 is normally closed Contact.