CN204288114U - A kind of overvoltage protection power circuit of computing machine - Google Patents
A kind of overvoltage protection power circuit of computing machine Download PDFInfo
- Publication number
- CN204288114U CN204288114U CN201420740397.3U CN201420740397U CN204288114U CN 204288114 U CN204288114 U CN 204288114U CN 201420740397 U CN201420740397 U CN 201420740397U CN 204288114 U CN204288114 U CN 204288114U
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- China
- Prior art keywords
- voltage
- electric capacity
- fuse
- transformer
- bridge rectifier
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- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of overvoltage protection power circuit of computing machine, comprise AC power, switch, transformer, bridge rectifier, first electric capacity, second electric capacity, fuse, one-way SCR, first voltage stabilizing diode, second voltage stabilizing diode, three terminal regulator, light emitting diode, resistance and triode, alternating voltage is through transformer pressure-reducing, bridge rectifier rectification, very low DC voltage is obtained after first electric capacity and the second capacitor filtering, the output terminal of three terminal regulator provides reference voltage for transistor base, when fault causes output voltage to exceed setting, ohmically pressure drop makes one-way SCR triggering and conducting, fuse blows now in circuit, stabilized voltage supply is protected because of Non voltage output.The utility model is when fault causes output voltage to exceed setting, and fuse can fuse automatically, thus reaches the object of protection power source, has the advantage that circuit structure is simple, power consumption is little, cost is low and efficiency is high simultaneously.
Description
Technical field
The utility model relates to a kind of power circuit for computer, particularly relates to a kind of overvoltage protection power circuit of computing machine.
Background technology
Power supply is that various electronic equipment must obligato ingredient, can performance quality be directly connected to the technical indicator of electronic equipment and work safely and reliably, the Switching Power Supply of computing machine is in operational process, because supply voltage is too high, power supply can be caused normally to start, or even burn, cause computing power to reduce.General overvoltage crowbar, mostly also exists circuit structure more complicated, power consumption is large, cost is high and inefficient problem.
Utility model content
The purpose of this utility model is just the overvoltage protection power circuit providing a kind of computing machine in order to solve the problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of overvoltage protection power circuit of computing machine, comprise AC power, switch, transformer, bridge rectifier, first electric capacity, second electric capacity, fuse, one-way SCR, first voltage stabilizing diode, second voltage stabilizing diode, three terminal regulator, light emitting diode, resistance and triode, the first end of described AC power is connected with the first end of described switch, second end of described switch is connected with the first end of the primary coil of described transformer, second end of described AC power is connected with the second end of the primary coil of described transformer, the first end of the secondary coil of described transformer is connected with the first voltage end of described bridge rectifier, second end of the secondary coil of described transformer is connected with the second voltage end of described bridge rectifier, the positive pole of described bridge rectifier respectively with the first end of described first electric capacity, the first end of described second electric capacity is connected with the first end of described fuse, second end of described fuse respectively with the input end of described three terminal regulator, the collector of described triode is connected with the anode of described one-way SCR, the emitter of described triode is connected with the negative pole of described second voltage stabilizing diode and the first voltage output end of described power circuit respectively, the base stage of described triode is connected with the output terminal of described three terminal regulator, the control pole of described one-way SCR is connected with the positive pole of described second voltage stabilizing diode and the first end of described resistance respectively, the negative electrode of described one-way SCR respectively with the negative pole of described bridge rectifier, second end of described first electric capacity, second end of described second electric capacity, the negative pole of described light emitting diode, second end of described resistance is connected with the second voltage output end of described power circuit, the positive pole of described light emitting diode is connected with the positive pole of described first voltage stabilizing diode, the negative pole of described first voltage stabilizing diode is connected with the earth terminal of described three terminal regulator.
In said structure, the output terminal of three terminal regulator provides reference voltage for transistor base, and when fault causes output voltage to exceed setting, ohmically pressure drop makes one-way SCR triggering and conducting, the fuse blows now in circuit.
The beneficial effects of the utility model are:
The utility model is a kind of overvoltage protection power circuit of computing machine; when fault causes output voltage to exceed setting; fuse can fuse automatically, thus reaches the object of protection power source, has the advantage that circuit structure is simple, power consumption is little, cost is low and efficiency is high simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the overvoltage protection power circuit of a kind of computing machine of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the overvoltage protection power circuit of a kind of computing machine of the utility model, comprise AC power AC, switch S, transformer T, bridge rectifier BR, first electric capacity C1, second electric capacity C2, fuse FU, unidirectional controllable silicon S CR, first voltage stabilizing diode DW1, second voltage stabilizing diode DW2, three terminal regulator IC, LED, resistance R and triode VT, the first end of AC power AC is connected with the first end of switch S, second end of switch S is connected with the first end of the primary coil of transformer T, second end of AC power AC is connected with the second end of the primary coil of transformer T, the first end of the secondary coil of transformer T is connected with first voltage end of bridge rectifier BR, second end of the secondary coil of transformer T is connected with second voltage end of bridge rectifier BR, the positive pole of bridge rectifier BR respectively with the first end of the first electric capacity C1, the first end of the second electric capacity C2 is connected with the first end of fuse FU, second end of fuse FU respectively with the input end of three terminal regulator IC, the collector of triode VT is connected with the anode of unidirectional controllable silicon S CR, the emitter of triode VT is connected with the negative pole of the second voltage stabilizing diode DW2 and the first voltage output end of power circuit respectively, the base stage of triode VT is connected with the output terminal of three terminal regulator IC, the control pole of unidirectional controllable silicon S CR is connected with the positive pole of the second voltage stabilizing diode DW2 and the first end of resistance R respectively, the negative electrode of unidirectional controllable silicon S CR respectively with the negative pole of bridge rectifier BR, second end of the first electric capacity C1, second end of the second electric capacity C2, the negative pole of LED, second end of resistance R is connected with the second voltage output end of power circuit, the positive pole of LED is connected with the positive pole of the first voltage stabilizing diode DW1, the negative pole of the first voltage stabilizing diode DW1 is connected with the earth terminal of three terminal regulator IC.
The model of three terminal regulator IC is LM7805.Alternating voltage is through transformer T step-down; bridge rectifier BR rectification; very low DC voltage is obtained after first electric capacity C1 and the second electric capacity C2 filtering; the output terminal of three terminal regulator IC provides reference voltage for triode VT base stage; when fault causes output voltage to exceed setting; pressure drop on resistance R makes unidirectional controllable silicon S CR triggering and conducting, and the fuse FU now in circuit fuses, and stabilized voltage supply is protected because of Non voltage output.
Claims (1)
1. the overvoltage protection power circuit of a computing machine, it is characterized in that: comprise AC power, switch, transformer, bridge rectifier, first electric capacity, second electric capacity, fuse, one-way SCR, first voltage stabilizing diode, second voltage stabilizing diode, three terminal regulator, light emitting diode, resistance and triode, the first end of described AC power is connected with the first end of described switch, second end of described switch is connected with the first end of the primary coil of described transformer, second end of described AC power is connected with the second end of the primary coil of described transformer, the first end of the secondary coil of described transformer is connected with the first voltage end of described bridge rectifier, second end of the secondary coil of described transformer is connected with the second voltage end of described bridge rectifier, the positive pole of described bridge rectifier respectively with the first end of described first electric capacity, the first end of described second electric capacity is connected with the first end of described fuse, second end of described fuse respectively with the input end of described three terminal regulator, the collector of described triode is connected with the anode of described one-way SCR, the emitter of described triode is connected with the negative pole of described second voltage stabilizing diode and the first voltage output end of described power circuit respectively, the base stage of described triode is connected with the output terminal of described three terminal regulator, the control pole of described one-way SCR is connected with the positive pole of described second voltage stabilizing diode and the first end of described resistance respectively, the negative electrode of described one-way SCR respectively with the negative pole of described bridge rectifier, second end of described first electric capacity, second end of described second electric capacity, the negative pole of described light emitting diode, second end of described resistance is connected with the second voltage output end of described power circuit, the positive pole of described light emitting diode is connected with the positive pole of described first voltage stabilizing diode, the negative pole of described first voltage stabilizing diode is connected with the earth terminal of described three terminal regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740397.3U CN204288114U (en) | 2014-12-01 | 2014-12-01 | A kind of overvoltage protection power circuit of computing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740397.3U CN204288114U (en) | 2014-12-01 | 2014-12-01 | A kind of overvoltage protection power circuit of computing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204288114U true CN204288114U (en) | 2015-04-22 |
Family
ID=52871251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420740397.3U Expired - Fee Related CN204288114U (en) | 2014-12-01 | 2014-12-01 | A kind of overvoltage protection power circuit of computing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204288114U (en) |
-
2014
- 2014-12-01 CN CN201420740397.3U patent/CN204288114U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20151201 |
|
| EXPY | Termination of patent right or utility model |