CN203368315U - Power source control circuit having stable starting performance - Google Patents
Power source control circuit having stable starting performance Download PDFInfo
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- CN203368315U CN203368315U CN 201320378762 CN201320378762U CN203368315U CN 203368315 U CN203368315 U CN 203368315U CN 201320378762 CN201320378762 CN 201320378762 CN 201320378762 U CN201320378762 U CN 201320378762U CN 203368315 U CN203368315 U CN 203368315U
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Abstract
The utility model discloses a power source control circuit having stable starting performance. The power source control circuit having stable starting performance comprises a transformer, wherein a primary winding of the transformer is connected in series with a power tube and is in coupling connection with anode and cathode direct current input ends, the power tube is controlled by a PWM control chip to start and stop, a start tube pin of the PWM control chip is connected with the anode direct current input end through the eighth resistor, the sixth capacitor is connected between the start tube pin of the PWM control chip and the cathode direct current input end, the first secondary winding of the transformer provides power for a load, one end of the second secondary winding of the transformer is connected with an anode of the second diode, the other end of the second secondary winding of the transformer is connected with the cathode direct current input end, a cathode of the second diode is connected with one end of the fourth capacitor and a power source tube pin of the PWM control chip, and the other end of the fourth capacitor is connected with the cathode direct current input end. When integral repeated fast on-off voltage input for a power source is carried out, the power source can operate normally, so reliable operation of the power source is guaranteed. The power source control circuit has advantages of simple structure, excellent performance, high reliability and low cost.
Description
Technical field
The utility model relates to power control circuit, relates in particular to the power control circuit that a kind of startability is stable.
Background technology
In contemporary society, along with the continuous progress of science and technology, also more and more higher to the requirement of power supply.The high power density of power supply, high conversion efficiency, volume microminiaturization and modularization have been the inexorable trend of social development.Present most desktop type adaptor power supplies, high-power system accessory power supply, EOC power supply all adopt the body frame structure of the flyback topological structure of technology maturation as circuit, wherein also are no lack of and are applied to the core parts of high precious OB2269C as the PWM control unit.In application, OB2269C also exists some problems in circuit is realized as main control chip needs perfect; such as need to detect the switching on and shutting down performance of power supply in power supply detects index, usually can be repeatedly fast the break-make input voltage detect mains switch machine performance with this and whether meet the demands.If adopt existing power control circuit, repeatedly fast during the break-make input voltage, the problem that OB2269C does not start easily appears at the power supply complete machine, seriously affected the overall performance of power supply.
The utility model content
The utility model is the problems referred to above that will solve prior art, proposes a kind of power control circuit that repeatedly has good startability during the break-make input voltage fast at the power supply complete machine of inverse-excitation type.
For solving the problems of the technologies described above, the technical scheme the utility model proposes is the stable power control circuit of a kind of startability of design, comprise anodal and negative pole direct-flow input end, positive pole and negative pole DC output end, transformer, power tube, pwm chip, one end of described anodal direct-flow input end connection transformer armature winding, the other end of primary winding connects power tube one end, the power tube other end connects the tenth resistance one end, another termination negative pole direct-flow input end of the tenth resistance, the control end of power tube connects pwm chip control impuls output pin by the 6th resistance, pwm chip starts pin and connects anodal direct-flow input end by the 8th resistance, and be connected the 6th electric capacity between the negative pole direct-flow input end, the lower margin of pwm chip connects the negative pole direct-flow input end, transformer the first secondary winding connects anodal and negative pole DC output end by rectification module, one end of transformer second subprime winding connects the anode of the second diode, the other end of second subprime winding connects the negative pole direct-flow input end, the negative electrode of the second diode connects an end of the 4th electric capacity and the power pin of pwm chip, the other end of the 4th electric capacity connects the negative pole direct-flow input end.
Connect RCD snubber module between the two ends of described primary winding.
Be connected the output voltage feedback module between the pulse-width adjustment pin of described anodal DC output end and pwm chip.
The frequency setting pin of described pwm chip connects the negative pole direct-flow input end by the 11 resistance.
The temperature detection pin of described pwm chip connects the negative pole direct-flow input end by thermistor.
The current sense pin of described pwm chip connects the negative pole direct-flow input end by described the tenth resistance.
Described pwm chip adopts OB2269C model control chip.
Compared with prior art, the utility model can normally start during the break-make input voltage repeatedly fast at the power supply complete machine, guarantees the reliably working of power supply; There is the advantages such as simple in structure, function admirable, reliability be high, with low cost simultaneously.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in detail, wherein:
The circuit diagram that Fig. 1 is the utility model preferred embodiment.
Embodiment
The utility model has disclosed the power control circuit that a kind of startability is stable, comprise anodal and negative pole direct-flow input end, positive pole and negative pole DC output end, transformer, power tube Q1, pwm chip U1, one end of described anodal direct-flow input end connection transformer armature winding, the other end of primary winding connects power tube one end, the power tube other end connects the tenth resistance R 10 1 ends, another termination negative pole direct-flow input end of the tenth resistance, the control end of power tube connects pwm chip control impuls output pin by the 6th resistance R 6, pwm chip starts pin and connects anodal direct-flow input end by the 8th resistance R 8, and be connected the 6th capacitor C 6 between the negative pole direct-flow input end, the lower margin of pwm chip connects the negative pole direct-flow input end, transformer the first secondary winding connects anodal and negative pole DC output end by rectification module, one end of transformer second subprime winding connects the anode of the second diode D2, the other end of second subprime winding connects the negative pole direct-flow input end, the negative electrode of the second diode connects an end of the 4th capacitor C 4 and the power pin of pwm chip, the other end of the 4th electric capacity connects the negative pole direct-flow input end.
Referring to Fig. 1, during work, DC power supply is by anodal direct-flow input end VIN+ and negative pole direct-flow input end VIN-input dc power, input voltage DC+ receives pwm chip by the 8th resistance R 8 and starts pin (the 3rd pin of U1), chip internal is started to charging, through the chip internal circuit conversion, give the external capacitor C4 charging of pwm chip power pin (the 7th pin of U1), after the C4 both end voltage progressively rises to the starter gate valve threshold voltage of chip U1, chip U1 starts startup work.The now control impuls output pin of pwm chip (the 8th pin of U1) output driving pulse, through resistance R 6 driving power pipe Q1 work (in preferred embodiment, power tube adopts field effect transistor).The input voltage positive pole is got back to the input voltage negative pole after primary winding T1A, power tube Q1, power resistor R10, completes the prime power conversion.Pwm chip starts between pin and negative pole direct-flow input end VIN-and is connected the 6th electric capacity, input current is played to the effect of accumulation of energy, at the power supply complete machine repeatedly fast in break-make input voltage situation, can normally start pwm chip, normal output, overcome and had the defect that can not normally start in such cases now, reached the purpose that promotes the power supply product performance.
In preferred embodiment, connect RCD snubber module between the two ends of described primary winding.Referring to Fig. 1, RCD snubber module comprises the first resistance R 1, the second capacitor C 2 and the 3rd diode D3.
In preferred embodiment, between the pulse-width adjustment pin of described anodal DC output end and pwm chip, be connected the output voltage feedback module.Referring to Fig. 1, the output voltage feedback module comprises that the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 9th resistance R the 9, the 12 resistance R 12, the 5th capacitor C 5, reference voltage chip U2, light lotus root OT1 form, transformer T1 is when prime power is changed, to produce induced voltage according to mutual inductance characteristic transformer the first secondary winding T1B of self, through diode D1 rectification, after electrochemical capacitor C3 filtering energy storage, by anodal DC output end VOUT+ and negative pole DC output end VOUT-output.Power resistor R2, for the output dummy load, guarantees the output stability of power supply when zero load.Resistance R 4, R5, R3, R12, R9, C5, U2, formed output and gathered feedback network, after output voltage is gathered to computing, feed back to the pulse-width adjustment pin (the 2nd pin of U1) of pwm chip by light lotus root OT1, complete the purpose that FEEDBACK CONTROL reaches regulated output voltage.
In preferred embodiment, the frequency setting pin of described pwm chip (the 4th pin of U1) connects the negative pole direct-flow input end by the 11 resistance R 11, realizes the setting of operating frequency by the size that changes resistance R 11.
In preferred embodiment, the temperature detection pin of described pwm chip (the 5th pin of U1) connects the negative pole direct-flow input end by thermistor RT1.NTC thermistor RT1 resistance corresponding after working temperature rises reduces, and U1 the 5th pin voltage starts to reduce, and when being reduced to the overheat protector threshold voltage, U1 turn-offs the 8th pin output driving pulse, and now prime power conversion stops.When operating ambient temperature reduces, the resistance of NTC thermistor RT1 starts to increase gradually, U1 the 5th pin voltage bottom out, and when voltage reaches overheat protector recovery threshold voltage, U1 the 8th pin recovers driving pulse, and the prime power change-over circuit recovers normal operation.
In preferred embodiment, the current sense pin of described pwm chip (the 6th pin of U1) connects the negative pole direct-flow input end by described the tenth resistance R 10.The 6th pin of U1 by the voltage on detection power resistance R 10 judge the prime power change-over circuit whether overcurrent, cross merit.When elementary circuit for power conversion the increase of output power; the electric current of power resistor R10 of flowing through also can increase, and the voltage on power resistor R10 also increases, when the voltage on power resistor R10 reaches the protective valve threshold voltage of U1; U1 the 8th pin turn-offs driving pulse, and the prime power change-over circuit quits work.When the lower voltage on power resistor R10 is following to threshold values, U1 the 8th pin recovers the output driving pulse, and the prime power circuit recovers normal operation.
In preferred embodiment, pwm chip adopts OB2269C model control chip.
Above embodiment is only for illustrating, non-providing constraints.Anyly do not break away from the application's spirit and category, and the equivalent modifications that it is carried out or change all should be contained among the application's claim scope.
Claims (7)
1. the power control circuit that startability is stable, comprise anodal and negative pole direct-flow input end, positive pole and negative pole DC output end, transformer, power tube (Q1), pwm chip (U1), it is characterized in that: an end of described anodal direct-flow input end connection transformer armature winding, the other end of primary winding connects power tube one end, the power tube other end connects the tenth resistance (R10) end, another termination negative pole direct-flow input end of the tenth resistance, the control end of power tube connects pwm chip control impuls output pin by the 6th resistance (R6), pwm chip starts pin and connects anodal direct-flow input end by the 8th resistance (R8), and be connected the 6th electric capacity (C6) between the negative pole direct-flow input end, the lower margin of pwm chip connects the negative pole direct-flow input end, transformer the first secondary winding connects anodal and negative pole DC output end by rectification module, one end of transformer second subprime winding connects the anode of the second diode (D2), the other end of second subprime winding connects the negative pole direct-flow input end, the negative electrode of the second diode connects an end of the 4th electric capacity (C4) and the power pin of pwm chip, the other end of the 4th electric capacity connects the negative pole direct-flow input end.
2. power control circuit as claimed in claim 1, is characterized in that: connect RCD snubber module between the two ends of described primary winding.
3. power control circuit as claimed in claim 1 is characterized in that: between the pulse-width adjustment pin of described anodal DC output end and pwm chip, be connected the output voltage feedback module.
4. power control circuit as claimed in claim 1, it is characterized in that: the frequency setting pin of described pwm chip connects the negative pole direct-flow input end by the 11 resistance (R11).
5. power control circuit as claimed in claim 1, it is characterized in that: the temperature detection pin of described pwm chip connects the negative pole direct-flow input end by thermistor (RT1).
6. power control circuit as claimed in claim 1, it is characterized in that: the current sense pin of described pwm chip connects the negative pole direct-flow input end by described the tenth resistance (R10).
7. power control circuit as described as claim 1 to 6 any one, is characterized in that: described pwm chip employing OB2269C model control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320378762 CN203368315U (en) | 2013-06-28 | 2013-06-28 | Power source control circuit having stable starting performance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320378762 CN203368315U (en) | 2013-06-28 | 2013-06-28 | Power source control circuit having stable starting performance |
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| CN203368315U true CN203368315U (en) | 2013-12-25 |
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| CN 201320378762 Expired - Fee Related CN203368315U (en) | 2013-06-28 | 2013-06-28 | Power source control circuit having stable starting performance |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501063B (en) * | 2014-12-18 | 2018-07-24 | 江苏新力科技实业有限公司 | A kind of mine flameproof and intrinsic safety type LED emergency lights by lithium battery power supply |
| CN110422073A (en) * | 2019-08-16 | 2019-11-08 | 平湖新纳通信技术有限公司 | Intelligent charging detection device and method thereof |
| CN114374313A (en) * | 2022-01-27 | 2022-04-19 | 青岛易来智能科技股份有限公司 | Starting circuit and control method thereof |
| CN118920411A (en) * | 2024-07-25 | 2024-11-08 | 广东尚研电子科技股份有限公司 | Projector switching power supply circuit with protection function |
-
2013
- 2013-06-28 CN CN 201320378762 patent/CN203368315U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501063B (en) * | 2014-12-18 | 2018-07-24 | 江苏新力科技实业有限公司 | A kind of mine flameproof and intrinsic safety type LED emergency lights by lithium battery power supply |
| CN110422073A (en) * | 2019-08-16 | 2019-11-08 | 平湖新纳通信技术有限公司 | Intelligent charging detection device and method thereof |
| CN114374313A (en) * | 2022-01-27 | 2022-04-19 | 青岛易来智能科技股份有限公司 | Starting circuit and control method thereof |
| CN118920411A (en) * | 2024-07-25 | 2024-11-08 | 广东尚研电子科技股份有限公司 | Projector switching power supply circuit with protection function |
| CN118920411B (en) * | 2024-07-25 | 2025-11-11 | 广东尚研电子科技股份有限公司 | Projector switching power supply circuit with protection function |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN JINGFUYUAN TECH. CO., LTD. Free format text: FORMER NAME: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park 12 Building 1, 2, 5 floor Patentee after: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. Address before: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park 12 Building 1, 2, 5 floor Patentee before: Shenzhen Jingfuyuan Tech Co., Ltd. |
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| 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: 20131225 Termination date: 20160628 |