CN202679235U - Switch power supply device achieving low loss during short circuit protecting process - Google Patents
Switch power supply device achieving low loss during short circuit protecting process Download PDFInfo
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- CN202679235U CN202679235U CN 201220337175 CN201220337175U CN202679235U CN 202679235 U CN202679235 U CN 202679235U CN 201220337175 CN201220337175 CN 201220337175 CN 201220337175 U CN201220337175 U CN 201220337175U CN 202679235 U CN202679235 U CN 202679235U
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Abstract
The utility model provides a switch power supply device achieving low loss during a short circuit protecting process, which comprises a MOSFET tube. The second pin of the MOSFET tube is connected with the VFB-STOP end of a PWM control chip. The third pin of the MOSFET tube is connected with one end of an eighth resistor R8. The first pin of the MOSFET tube is connected with the other end of the eighth resistor R8. One end of a third capacitor C3 is connected with one end of the eighth resistor R8. The other end of the third capacitor C3 is connected with the other end of the eighth resistor R8. One end of a seventh resistor R7 is connected with the other end of the third capacitor C3. The other end of the seventh resistor R7 is connected with one end of a sixth resistor R6. The other end of the sixth resistor R6 is connected with a VCC end. The other end of the seventh resistor R7 is connected with one end of a fourth capacitor C4 the other end of which is connected with the third pin of the MOSFET tube. The switch power supply device provided in the utility model achieves power supply low-loss protection by controlling the frequency of hiccup protection. Meanwhile, the switch power supply device enables normal power supply outputs after output overcurrent and short circuit phenomena are eliminated.
Description
Technical field
The utility model relates to electronic technology field, and particularly a kind of have a Switching Power Supply that can realize low-loss, high reliability in overcurrent, short-circuit protection.
Background technology
In the prior art, a lot of Switching Power Supplies all have output overcurrent, output short circuit protection function, and protected mode is generally hiccup protections.This class protection circuit can be protected output loading equipment effectively, but because the frequency of hiccup protections is not easy control usually, causes after protection circuit is triggered, and the loss of whole supply unit is still very large.Under the guard mode of long-time lossy, the power device of supply unit may be excessive because of loss, excess Temperature and losing efficacy, and then cause supply unit to lose efficacy.
The utility model content
The utility model provides a kind of Switching Power Supply that can realize low-loss, high reliability in overcurrent, short-circuit protection that has.
To achieve these goals, the utility model provides following technical scheme:
Low-loss switching power unit during a kind of short-circuit protection, it comprises:
The 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 4th capacitor C 4, the 3rd capacitor C 3 and MOSFET(metal-oxide half field effect transistor) pipe, the 2nd pin connection PWM(pulse-width modulation of described MOSFET pipe) the VFB_STOP end of control chip, the 3rd pin of described MOSFET pipe connects an end of the 8th resistance R 8, the 1st pin of described MOSFET pipe connects the other end of described the 8th resistance R 8, one end of described the 3rd capacitor C 3 connects an end of the 8th resistance R 8, the other end of described the 3rd capacitor C 3 connects the other end of the 8th resistance R 8, one end of described the 7th resistance R 7 connects the other end of described the 3rd capacitor C 3, the other end of described the 7th resistance R 7 connects an end of the 6th resistance R 6, the other end of described the 6th resistance R 6 connects the VCC end, the other end of described the 7th resistance R 7 also connects an end of the 4th capacitor C 4, and the other end of described the 4th capacitor C 4 connects the 3rd pin of described MOSFET pipe.
Preferably, also comprise: the control utmost point of the other end connecting triode Q1 of described the 6th resistance R 6, the emitter of described triode connect the Vcc end of pwm chip.
Preferably, the base stage of described triode Q1 connects an end of the second capacitor C 2, and the other end of described the second capacitor C 2 connects the Vcc end of pwm chip.
Preferably, the base stage of described triode Q1 connects an end of the 3rd resistance R 3, the other end of described the 3rd resistance R 3 connects the Vcc end of pwm chip, one end of described the 3rd resistance R 3 also connects an end of the 4th resistance R 4, the other end of described the 4th resistance R 4 connects the negative pole of voltage stabilizing didoe U1, and the positive pole of described voltage stabilizing didoe U1 connects the 3rd pin of MOSFET pipe.
Preferably, the control end of described voltage stabilizing didoe U1 also connects an end of the first resistance R 1, the other end of described the first resistance R 1 also connects the Vcc end of pwm chip, one end of described the first resistance R 1 also connects an end of the second resistance R 2, and the other end of described the first resistance R 2 connects the 3rd pin of MOSFET pipe.
By implementing above technical scheme, have following technique effect: the Switching Power Supply that the utility model provides, by the frequency of control hiccup protections, realize power supply low-loss protection.After output overcurrent, short circuit were eliminated, power supply still can normally be exported.
Description of drawings
Fig. 1 provides the circuit theory diagrams of Switching Power Supply for the utility model.
Embodiment
In order better to understand the technical solution of the utility model, describe the embodiment that the utility model provides in detail below in conjunction with accompanying drawing.
Low-loss switching power unit when the utility model embodiment provides a kind of short-circuit protection as shown in Figure 1, comprising:
The 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 4th capacitor C 4, the 3rd capacitor C 3 and MOSFET pipe, the 2nd pin of described MOSFET pipe connects the VFB_STOP end of pwm chip, preferably, the 2nd pin of this MOSFET pipe connects the VFB_STOP end of pwm chip by the 9th resistance R 9.The 3rd pin of described MOSFET pipe connects an end of the 8th resistance R 8, the 1st pin of described MOSFET pipe connects the other end of described the 8th resistance R 8, one end of described the 3rd capacitor C 3 connects an end of the 8th resistance R 8, the other end of described the 3rd capacitor C 3 connects the other end of the 8th resistance R 8, one end of described the 7th resistance R 7 connects the other end of described the 3rd capacitor C 3, the other end of described the 7th resistance R 7 connects an end of the 6th resistance R 6, the other end of described the 6th resistance R 6 connects the VCC end, the other end of described the 7th resistance R 7 also connects an end of the 4th capacitor C 4, and the other end of described the 4th capacitor C 4 connects the 3rd pin of described MOSFET pipe.This pwm chip comprises that also the D end for ground connection, the Drive that controls for driving hold.
In other embodiments, on above-described embodiment basis, further, also comprise: the control utmost point of the other end connecting triode Q1 of described the 6th resistance R 6, the emitter of described triode connect the Vcc end of pwm chip.
In other embodiments, on above-described embodiment basis, further, the base stage of described triode Q1 connects an end of the second capacitor C 2, and the other end of described the second capacitor C 2 connects the Vcc end of pwm chip.
In other embodiments, on above-described embodiment basis, further, the base stage of described triode Q1 connects an end of the 3rd resistance R 3, the other end of described the 3rd resistance R 3 connects the Vcc end of pwm chip, one end of described the 3rd resistance R 3 also connects an end of the 4th resistance R 4, and the other end of described the 4th resistance R 4 connects the negative pole of voltage stabilizing didoe U1, and the positive pole of described voltage stabilizing didoe U1 connects the 3rd pin of MOSFET pipe.
In other embodiments, on above-described embodiment basis, further, the control end of described voltage stabilizing didoe U1 also connects an end of the first resistance R 1, the other end of described the first resistance R 1 also connects the Vcc end of pwm chip, one end of described the first resistance R 1 also connects an end of the second resistance R 2, and the other end of described the first resistance R 2 connects the 3rd pin of MOSFET pipe.
In the Switching Power Supply that above-mentioned example provides, the circuit protection of this Switching Power Supply has two process: charging process T1, and discharge process T2, T1, T2 have determined the cycle of protection.
Charging process: the first resistance R 1, the second resistance R 2 detect resistance for dividing potential drop, be used for detecting the change in voltage of VFB end, when output overcurrent, short circuit, the VFB terminal voltage rises, and exceeds set definite value Vover to the VFB terminal voltage, the voltage stabilizing didoe U1 conducting of a reference source by detecting resistance detection, there is electric current will flow through the 3rd resistance R 3, the 4th resistance R 4, and give simultaneously the second capacitor C 2 chargings, when the second capacitor C 2 both end voltage reach triode Q1 threshold voltage, control triode Q1 conducting.Give the 4th capacitor C 4,3 chargings of the 3rd capacitor C by the 6th resistance R 6, voltage reaches MoSFET pipe (model: threshold voltage 2N7002) on the 3rd capacitor C 3, the 4th capacitor C 4, the conducting of control MOSFET pipe, drag down the voltage of the VFB_STOP end of pwm chip by a current-limiting resistance, turn-off pwm chip.T2: discharge process: the VFB terminal voltage of pwm chip drops under the Vover voltage, voltage stabilizing didoe U1 turn-offs, turn-off immediately triode Q1, the 4th capacitor C 4, the 3rd capacitor C 3 will be by 8 pairs of ground wire discharges of the 8th resistance R, the voltage of the 4th capacitor C 4, the 3rd capacitor C 3 drops to below the threshold voltage of MOSFET pipe, control MOSFET pipe turn-offs, and pwm chip is reworked, and it is normal that circuit recovers.T2 in the time pwm chip be in off state, whole circuit loss is very little.By reducing the T1 time, increasing the T2 time, reduce the loop average loss with this, realize low-loss control.By the low-loss of power supply under the protected mode, promoted the reliability of Power Management Design, be conducive to the fail safe of load equipment, simultaneously low-loss is user's energy savings, has reduced the wasting of resources that equipment loss brings.
More than a kind of Switching Power Supply that the utility model embodiment is provided be described in detail, for one of ordinary skill in the art, thought according to the utility model embodiment, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (5)
1. low-loss switching power unit during a short-circuit protection is characterized in that, comprising:
The 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 4th capacitor C 4, the 3rd capacitor C 3 and MOSFET pipe, the 2nd pin of described MOSFET pipe connects the VFB_STOP end of pwm chip, the 3rd pin of described MOSFET pipe connects an end of the 8th resistance R 8, the 1st pin of described MOSFET pipe connects the other end of described the 8th resistance R 8, one end of described the 3rd capacitor C 3 connects an end of the 8th resistance R 8, the other end of described the 3rd capacitor C 3 connects the other end of the 8th resistance R 8, one end of described the 7th resistance R 7 connects the other end of described the 3rd capacitor C 3, the other end of described the 7th resistance R 7 connects an end of the 6th resistance R 6, the other end of described the 6th resistance R 6 connects the VCC end, the other end of described the 7th resistance R 7 also connects an end of the 4th capacitor C 4, and the other end of described the 4th capacitor C 4 connects the 3rd pin of described MOSFET pipe.
2. low-loss switching power unit during short-circuit protection as claimed in claim 1 is characterized in that also comprise: the control utmost point of the other end connecting triode Q1 of described the 6th resistance R 6, the emitter of described triode connect the Vcc end of pwm chip.
3. low-loss switching power unit during short-circuit protection as claimed in claim 2 is characterized in that the base stage of described triode Q1 connects an end of the second capacitor C 2, and the other end of described the second capacitor C 2 connects the Vcc end of pwm chip.
4. low-loss switching power unit during short-circuit protection as claimed in claim 3; it is characterized in that; the base stage of described triode Q1 connects an end of the 3rd resistance R 3; the other end of described the 3rd resistance R 3 connects the Vcc end of pwm chip; one end of described the 3rd resistance R 3 also connects an end of the 4th resistance R 4; the other end of described the 4th resistance R 4 connects the negative pole of voltage stabilizing didoe U1, and the positive pole of described voltage stabilizing didoe U1 connects the 3rd pin of MOSFET pipe.
5. low-loss switching power unit during short-circuit protection as claimed in claim 4; it is characterized in that; the control end of described voltage stabilizing didoe U1 also connects an end of the first resistance R 1; the other end of described the first resistance R 1 also connects the Vcc end of pwm chip; one end of described the first resistance R 1 also connects an end of the second resistance R 2, and the other end of described the first resistance R 2 connects the 3rd pin of MOSFET pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220337175 CN202679235U (en) | 2012-07-12 | 2012-07-12 | Switch power supply device achieving low loss during short circuit protecting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220337175 CN202679235U (en) | 2012-07-12 | 2012-07-12 | Switch power supply device achieving low loss during short circuit protecting process |
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| Publication Number | Publication Date |
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| CN202679235U true CN202679235U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220337175 Expired - Lifetime CN202679235U (en) | 2012-07-12 | 2012-07-12 | Switch power supply device achieving low loss during short circuit protecting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377950A (en) * | 2014-11-05 | 2015-02-25 | 深圳市汇川技术股份有限公司 | Starting circuit of power supply control chip |
| CN106033880A (en) * | 2015-03-09 | 2016-10-19 | 何曙光 | Hiccup type protection circuits for DC power supply |
-
2012
- 2012-07-12 CN CN 201220337175 patent/CN202679235U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377950A (en) * | 2014-11-05 | 2015-02-25 | 深圳市汇川技术股份有限公司 | Starting circuit of power supply control chip |
| CN104377950B (en) * | 2014-11-05 | 2017-02-15 | 深圳市汇川技术股份有限公司 | Starting circuit of power supply control chip |
| CN106033880A (en) * | 2015-03-09 | 2016-10-19 | 何曙光 | Hiccup type protection circuits for DC power supply |
| CN106033880B (en) * | 2015-03-09 | 2019-01-22 | 广东泓睿科技有限公司 | DC power supply hiccup formula protects circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Gao Qi Inventor after: Luo Zhiping Inventor after: Liu Kuan Inventor before: Gao Qi |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: GAO QI TO: GAO QI LUO ZHIPING LIU KUAN |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130116 |
|
| CX01 | Expiry of patent term |