CN205050070U - Computer power supply circuit - Google Patents
Computer power supply circuit Download PDFInfo
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- CN205050070U CN205050070U CN201520708877.6U CN201520708877U CN205050070U CN 205050070 U CN205050070 U CN 205050070U CN 201520708877 U CN201520708877 U CN 201520708877U CN 205050070 U CN205050070 U CN 205050070U
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Abstract
The utility model discloses a computer power supply circuit, including resistance R1, resistance R10, chip U2, transformer T and controllable accurate steady voltage source U1, resistance R10 connects electric capacity C7, transformer T coil L2, power VCC and resistance R1 respectively, and the resistance R1 other end is connecting resistance R2, resistance R6 and controllable accurate steady voltage source U1's the R utmost point respectively. The utility model discloses utilize voltage and controllable accurate steady voltage source TL431 that the intrinsic reference voltage source of UC3842 chip provided, use controllable accurate steady voltage source TL431 to be benchmark and error magnification simultaneously, utilize the intrinsic reference voltage source in the inside of UC3842 chip for protection circuit provide voltage, the safety and stability, diode VD2 and diode VD3 in addition, can be worth to safely because of the spike voltage clamper that the leakage inductance produced with transformer T coil, the stability of circuit has been promoted, whole circuit structure is simple, and small in size, low cost and stable performance.
Description
Technical field
The utility model relates to a kind of power circuit, specifically a kind of computer power supply power circuit.
Background technology
Along with the development of electronic technology, the life of people and too busy to get away computing machine, and computing machine is as a kind of sophisticated electronics, its in-line power is even more important safely, on the basis of miniaturization, how to make power supply keep safety and stability, be the research emphasis of each large computer vendors.
Utility model content
The purpose of this utility model is the computer power supply power circuit based on UC3842 providing a kind of circuit structure simple, with low cost, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of computer power supply power circuit, comprise resistance R1, resistance R10, chip U2, transformer T and controllable accurate source of stable pressure U1, described resistance R10 connects electric capacity C7 respectively, transformer T coil L2, power supply VCC and resistance R1, the resistance R1 other end is contact resistance R2 respectively, the R pole of resistance R6 and controllable accurate source of stable pressure U1, the resistance R2 other end connects the electric capacity C2 other end respectively, the A pole of controllable accurate source of stable pressure U1, electric capacity C5, electric capacity C4, chip U2 pin 5 and resistance RS ground connection, the resistance R6 other end is contact resistance R5 and triode VT1 collector respectively, triode VT1 base stage is contact resistance R4 and resistance R3 respectively, the resistance R3 other end connects the K pole of controllable accurate source of stable pressure U1, the described resistance R4 other end is connecting triode VT1 emitter respectively, resistance R9 and chip U2 pin 8, chip U2 pin 4 is the contact resistance R9 other end and the electric capacity C5 other end respectively, chip U2 pin 3 connects the electric capacity C4 other end and the resistance R5 other end respectively, described chip U2 pin 6 is by the G pole of resistance R7 connecting valve pipe VT2, D pole contact resistance R11 and the transformer T coil L2 other end respectively of switching tube VT2, the resistance R11 other end connects the electric capacity C7 other end, the described resistance R10 other end connects direct earth capacitance C1 respectively, diode VD1 negative pole and chip U2 pin 7, diode VD1 positive pole connects grounded inductor L1, described chip U2 pin 2 connects chip U2 pin 1 by electric capacity C3, described transformer T coil L3 one end connects electric capacity C6 respectively, diode VD2 positive pole and output terminals A, the transformer T coil L3 other end connects the electric capacity C6 other end respectively, diode VD3 positive pole and output terminal B, the S pole of described resistance RS other end connecting valve pipe VT2, described diode VD2 negative pole connects diode VD3 negative pole, described chip U2 model is UC3842.
As further program of the utility model: described controllable accurate source of stable pressure U1 model is TL431.
As the utility model further scheme: described diode VD3 is voltage stabilizing diode.
Compared with prior art, the beneficial effects of the utility model are: the voltage that the utility model utilizes the intrinsic reference voltage source of UC3842 chip to provide and controllable accurate source of stable pressure TL431, use controllable accurate source of stable pressure TL431 is double does benchmark and error amplification, the intrinsic reference voltage source in the inside of UC3842 chip is utilized to provide voltage for protection circuit, safety and stability, diode VD2 and diode VD3 in addition, the peak voltage clamper that transformer T coil can be produced because of leakage inductance is to safety value, improve the stability of circuit, whole circuit structure is simple, volume is little, with low cost and stable performance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of computer power supply power circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of computer power supply power circuit, comprise resistance R1, resistance R10, chip U2, transformer T and controllable accurate source of stable pressure U1, described resistance R10 connects electric capacity C7 respectively, transformer T coil L2, power supply VCC and resistance R1, the resistance R1 other end is contact resistance R2 respectively, the R pole of resistance R6 and controllable accurate source of stable pressure U1, the resistance R2 other end connects the electric capacity C2 other end respectively, the A pole of controllable accurate source of stable pressure U1, electric capacity C5, electric capacity C4, chip U2 pin 5 and resistance RS ground connection, the resistance R6 other end is contact resistance R5 and triode VT1 collector respectively, triode VT1 base stage is contact resistance R4 and resistance R3 respectively, the resistance R3 other end connects the K pole of controllable accurate source of stable pressure U1, the described resistance R4 other end is connecting triode VT1 emitter respectively, resistance R9 and chip U2 pin 8, chip U2 pin 4 is the contact resistance R9 other end and the electric capacity C5 other end respectively, chip U2 pin 3 connects the electric capacity C4 other end and the resistance R5 other end respectively, described chip U2 pin 6 is by the G pole of resistance R7 connecting valve pipe VT2, D pole contact resistance R11 and the transformer T coil L2 other end respectively of switching tube VT2, the resistance R11 other end connects the electric capacity C7 other end, the described resistance R10 other end connects direct earth capacitance C1 respectively, diode VD1 negative pole and chip U2 pin 7, diode VD1 positive pole connects grounded inductor L1, described chip U2 pin 2 connects chip U2 pin 1 by electric capacity C3, described transformer T coil L3 one end connects electric capacity C6 respectively, diode VD2 positive pole and output terminals A, the transformer T coil L3 other end connects the electric capacity C6 other end respectively, diode VD3 positive pole and output terminal B, the S pole of described resistance RS other end connecting valve pipe VT2, described diode VD2 negative pole connects diode VD3 negative pole, described chip U2 model is UC3842.
Controllable accurate source of stable pressure U1 model is TL431.
Diode VD3 is voltage stabilizing diode.
Principle of work of the present utility model is: resistance R1 ~ R6, chip U1 and triode VT1 form protection circuit against input over-voltage, when input voltage exceedes setting value, triode VT1 conducting makes the voltage of the pin 3 of chip U2 more than 1V, output driving pulse is blocked, the voltage that switching tube VT2 is born is only input voltage, switching tube VT2 is protected, the current/voltage that the electric current flowing through switching tube VT2 is set up on sample resistance RS is input to the pin 3 of chip U2, can limit by switch tube VT2 peak point current, thus realize output overcurrent or short-circuit protection; Controllable accurate source of stable pressure U1 and triode VT1 forms reference source and error amplifier, when input voltage increase gradually make the voltage of divider resistance R2 be greater than 2.5V time, controllable accurate source of stable pressure U1 and triode VT1 conducting, pin 3 voltage of chip U2 will be greater than 1V, the electric circuit inspection comparer of its inside exports high level, output driving pulse is blocked, when input voltage is in normal operating voltage range, voltage on divider resistance R2 is less than 2.5V, controllable accurate source of stable pressure U1 and triode VT1 not conducting, chip U2 is just in normal operating conditions.After protection circuit action, in order to prevent the vibration causing power supply due to the fluctuation of input power, in input protection circuit, introduce the resistance R6 preventing from vibrating.
Claims (3)
1. a computer power supply power circuit, comprise resistance R1, resistance R10, chip U2, transformer T and controllable accurate source of stable pressure U1, it is characterized in that, described resistance R10 connects electric capacity C7 respectively, transformer T coil L2, power supply VCC and resistance R1, the resistance R1 other end is contact resistance R2 respectively, the R pole of resistance R6 and controllable accurate source of stable pressure U1, the resistance R2 other end connects the electric capacity C2 other end respectively, the A pole of controllable accurate source of stable pressure U1, electric capacity C5, electric capacity C4, chip U2 pin 5 and resistance RS ground connection, the resistance R6 other end is contact resistance R5 and triode VT1 collector respectively, triode VT1 base stage is contact resistance R4 and resistance R3 respectively, the resistance R3 other end connects the K pole of controllable accurate source of stable pressure U1, the described resistance R4 other end is connecting triode VT1 emitter respectively, resistance R9 and chip U2 pin 8, chip U2 pin 4 is the contact resistance R9 other end and the electric capacity C5 other end respectively, chip U2 pin 3 connects the electric capacity C4 other end and the resistance R5 other end respectively, described chip U2 pin 6 is by the G pole of resistance R7 connecting valve pipe VT2, D pole contact resistance R11 and the transformer T coil L2 other end respectively of switching tube VT2, the resistance R11 other end connects the electric capacity C7 other end, the described resistance R10 other end connects direct earth capacitance C1 respectively, diode VD1 negative pole and chip U2 pin 7, diode VD1 positive pole connects grounded inductor L1, described chip U2 pin 2 connects chip U2 pin 1 by electric capacity C3, described transformer T coil L3 one end connects electric capacity C6 respectively, diode VD2 positive pole and output terminals A, the transformer T coil L3 other end connects the electric capacity C6 other end respectively, diode VD3 positive pole and output terminal B, the S pole of described resistance RS other end connecting valve pipe VT2, described diode VD2 negative pole connects diode VD3 negative pole, described chip U2 model is UC3842.
2. computer power supply power circuit according to claim 1, is characterized in that, described controllable accurate source of stable pressure U1 model is TL431.
3. computer power supply power circuit according to claim 1, is characterized in that, described diode VD3 is voltage stabilizing diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520708877.6U CN205050070U (en) | 2015-09-14 | 2015-09-14 | Computer power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520708877.6U CN205050070U (en) | 2015-09-14 | 2015-09-14 | Computer power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205050070U true CN205050070U (en) | 2016-02-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520708877.6U Expired - Fee Related CN205050070U (en) | 2015-09-14 | 2015-09-14 | Computer power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205050070U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106445058A (en) * | 2016-12-27 | 2017-02-22 | 郑州诚合信息技术有限公司 | Computer internal power detecting module |
-
2015
- 2015-09-14 CN CN201520708877.6U patent/CN205050070U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106445058A (en) * | 2016-12-27 | 2017-02-22 | 郑州诚合信息技术有限公司 | Computer internal power detecting module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160224 Termination date: 20160914 |