CN103066820A - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN103066820A CN103066820A CN2012105484454A CN201210548445A CN103066820A CN 103066820 A CN103066820 A CN 103066820A CN 2012105484454 A CN2012105484454 A CN 2012105484454A CN 201210548445 A CN201210548445 A CN 201210548445A CN 103066820 A CN103066820 A CN 103066820A
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Abstract
The invention discloses a switching power supply which comprises a rectification filter circuit, a switching power supply controller and a high-frequency transformer. An output end of the rectification filter circuit is connected with an input end of the switching power supply controller. An output end of the switching power supply controller is connected with an input end of the high-frequency transformer. A feedback end of the high-frequency transformer is connected with the input end of the switching power supply controller. The switching power supply further comprises a low-voltage protection circuit capable of cutting off power output when input voltage is too low. An input voltage detection end of the low-voltage protection circuit is connected with the output end of the rectification filter circuit. A feedback end of the low-voltage protection circuit is connected with the high-frequency transformer. An on-off control end of the low-voltage protection circuit is connected with the switching power supply controller. The switching power supply can cut off power output when the input voltage is lower than a working range.
Description
Technical field
The present invention relates to a kind of Switching Power Supply.
Background technology
Switching Power Supply is with small-sized, light weight, in the fields such as the wide and high efficiency characteristics of input range have been widely used in and have communicated by letter, household electrical appliances, industrial instrument.Although the input voltage range of Switching Power Supply is wide, but near some remote mountain areas, industrial working, when electric loading is excessive, still can cause input voltage excessively low, be the input voltage range that input voltage is lower than Switching Power Supply, and then cause the power output of Switching Power Supply to damage not power consumption equipment.Therefore, for these reasons, demand urgently needing a kind of low-voltage protection circuit, guarantee to block power stage when input voltage is lower than working range, to overcome the above problems.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the defective of above prior art, and a kind of Switching Power Supply is provided, and this circuit can block power stage when input voltage is lower than working range.
Technical scheme of the present invention is, a kind of Switching Power Supply is provided, comprise current rectifying and wave filtering circuit, switch power controller and high frequency transformer, the output of described current rectifying and wave filtering circuit is connected with the input of switch power controller, the output of described switch power controller is connected with the input of high frequency transformer, and the feedback end of described high frequency transformer is connected with the input of switch power controller; Described Switching Power Supply comprises that also one crosses the low-voltage protection circuit that can block power stage when low at input voltage; the input voltage test side of described low-voltage protection circuit is connected with the output of current rectifying and wave filtering circuit; the feedback end of described low-voltage protection circuit is connected with high frequency transformer, and the break-make control end of described low-voltage protection circuit is connected with switch power controller.
Described low-voltage protection circuit comprises dividing potential drop and current-limiting circuit, electric power management circuit, control circuit and feedback circuit, and described dividing potential drop and current-limiting circuit are connected with electric power management circuit, control circuit, feedback circuit successively; Described dividing potential drop and current-limiting circuit also are connected with the output of current rectifying and wave filtering circuit; Described feedback circuit is connected with high frequency transformer; Described control circuit, feedback circuit also are connected with switch power controller.
Described low-voltage protection circuit also comprises a power protecting circuit for the protection of electric power management circuit, and described power protecting circuit and dividing potential drop and current-limiting circuit, electric power management circuit are connected.
Described dividing potential drop and current-limiting circuit are composed in series successively by resistance R 1, resistance R 2, resistance R 3, resistance R 4, and described resistance R 1, resistance R 4 also are connected with the output of current rectifying and wave filtering circuit.
Described electric power management circuit comprises power management chip, capacitor C 1 and resistance R 5, and an end of described capacitor C 1 is connected with earth terminal, and the other end of described capacitor C 1 is connected with Vdd pin, the resistance R 4 of power management chip; One end of described resistance R 5 is connected with the Vout pin of power management chip; The VSS pin of described power management chip is connected with earth terminal.
Described control circuit comprises the metal-oxide-semiconductor V1 of resistance R 7, capacitor C 2 and N road ditch, described resistance R 7, capacitor C 2 parallel connections; The end that described resistance R 7 is connected with capacitor C is connected with the other end of the G utmost point of metal-oxide-semiconductor V1, resistance R 5, and the other end that described resistance R 7 is connected with capacitor C, the S of metal-oxide-semiconductor V1 extremely all are connected with earth terminal; The D utmost point of described metal-oxide-semiconductor V1 is connected with switch power controller, feedback circuit.
Described feedback circuit is an optical coupler E1, and the signal input part of described optical coupler E1 is connected with high frequency transformer; One contact of described optical coupler E1 signal output part is connected with earth terminal, and another contact of described optical coupler E1 signal output part is connected with the D utmost point, the switch power controller of metal-oxide-semiconductor V1.
Described power protecting circuit is by resistance R 6 and low-leakage current voltage stabilizing didoe D1, and an end of described resistance R 6 is connected with resistance R 4, and the other end of described resistance R 6 is connected with the negative electrode of diode D1, and the anode of described diode D1 is connected with earth terminal.
After adopting above structure, the present invention compared with prior art has the following advantages:
Switching Power Supply of the present invention is provided with a low-voltage protection circuit, can be so that work after meeting scope, input voltage be carried out in the work that Switching Power Supply is crossed shutdown switch power supply when low at input voltage again by this circuit, thus can guarantee that normal power output ground stablizes.Therefore this Switching Power Supply is applied near the environment some remote mountain areas, industrial working, when electric loading is excessive, still can cause input voltage excessively low, it is the input voltage range that input voltage is lower than Switching Power Supply, power stage that in this case can the cutoff switch power supply is to avoid damaging power consumption equipment.Therefore, can find out from above description that the input voltage range of Switching Power Supply of the present invention is wider, its functional reliability is higher.
As improvement; described low-voltage protection circuit comprises dividing potential drop and current-limiting circuit, electric power management circuit, control circuit and feedback circuit; by the mode of the dividing potential drop input voltage value of sampling; when input voltage value is lower than set point; output signal to control circuit by electric power management circuit; so that the output voltage feedback drags down, Switching Power Supply quits work.This circuit is owing to be that real-time sampling, in real time control ground, so sample rate are fast and the protection time-delay is short.
As improvement, described low-voltage protection circuit also comprises a power protecting circuit, by the further pressure limiting of this circuit, with the normal operation of protection power source management circuit.
As improvement; described control circuit comprises the metal-oxide-semiconductor V1 of resistance R 7, capacitor C 2 and N road ditch; described protective circuit is by resistance R 6 and low-leakage current voltage stabilizing didoe D1, owing to having adopted above-mentioned low power dissipation electron device, therefore so that the power consumption of Switching Power Supply of the present invention is lower.
Description of drawings
Fig. 1 is the circuit block diagram of Switching Power Supply of the present invention.
Fig. 2 is the circuit theory diagrams of low-voltage protection circuit.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1 and Figure 2, a kind of Switching Power Supply of the present invention, comprise current rectifying and wave filtering circuit, switch power controller and high frequency transformer, switch power controller by among the quasi-resonance controller HFC0100(figure without illustrating) and peripheral circuit (among the figure without illustrating) form; The output of described current rectifying and wave filtering circuit is connected with the input of switch power controller, and the output of described switch power controller is connected with the input of high frequency transformer, and the feedback end of described high frequency transformer is connected with the input of switch power controller.
Described Switching Power Supply comprises that also one crosses the low-voltage protection circuit that can block power stage when low at input voltage, the input voltage test side of described low-voltage protection circuit is connected with the output of current rectifying and wave filtering circuit, for detection of the input voltage of the output of current rectifying and wave filtering circuit; The feedback end of described low-voltage protection circuit is connected with high frequency transformer, is used for the output voltage of sampling switch power supply, and this voltage is supplied with switch power controller, i.e. the FB pin of quasi-resonance controller HFC0100; The break-make control end of described low-voltage protection circuit is connected with switch power controller, whether is used for the action of control switch power supply.
Described low-voltage protection circuit comprises dividing potential drop and current-limiting circuit, electric power management circuit, control circuit and feedback circuit, and described dividing potential drop and current-limiting circuit are connected with electric power management circuit, control circuit, feedback circuit successively; Described dividing potential drop and current-limiting circuit also are connected with the output of current rectifying and wave filtering circuit, and namely the both positive and negative polarity of dividing potential drop and current-limiting circuit is connected with the both positive and negative polarity of the output of current rectifying and wave filtering circuit respectively; Described feedback circuit is connected with high frequency transformer; Described control circuit, feedback circuit also are connected with switch power controller.
Described low-voltage protection circuit also comprises a power protecting circuit for the protection of electric power management circuit, and described power protecting circuit and dividing potential drop and current-limiting circuit, electric power management circuit are connected.
Described dividing potential drop and current-limiting circuit are composed in series successively by resistance R 1, resistance R 2, resistance R 3, resistance R 4, and described resistance R 1, resistance R 4 also are connected with the output of current rectifying and wave filtering circuit.
Described electric power management circuit comprises power management chip, capacitor C 1 and resistance R 5, and an end of described capacitor C 1 is connected with earth terminal, and the other end of described capacitor C 1 is connected with Vdd pin, the resistance R 4 of power management chip; One end of described resistance R 5 is connected with the Vout pin of power management chip; The VSS pin of described power management chip is connected with earth terminal.
Described control circuit comprises the metal-oxide-semiconductor V1 of resistance R 7, capacitor C 2 and N road ditch, described resistance R 7, capacitor C 2 parallel connections; The end that described resistance R 7 is connected with capacitor C is connected with the other end of the G utmost point of metal-oxide-semiconductor V1, resistance R 5, and the other end that described resistance R 7 is connected with capacitor C, the S of metal-oxide-semiconductor V1 extremely all are connected with earth terminal; The D utmost point of described metal-oxide-semiconductor V1 is connected with switch power controller, feedback circuit.
Described feedback circuit is an optical coupler E1, and the signal input part of described optical coupler E1 (1,2 pin) is connected with high frequency transformer; One contact of described optical coupler E1 signal output part (3 pin) is connected with earth terminal, and another contact of described optical coupler E1 signal output part (4 pin) is connected with the D utmost point of metal-oxide-semiconductor V1, the FB pin of switch power controller.
Described power protecting circuit is by resistance R 6 and low-leakage current voltage stabilizing didoe D1, and an end of described resistance R 6 is connected with resistance R 4, and the other end of described resistance R 6 is connected with the negative electrode of diode D1, and the anode of described diode D1 is connected with earth terminal.
During work, come the sense switch power input voltage by power management chip IMP810T, control the feedback that optocoupler EL817 output feeds back by N road ditch metal-oxide-semiconductor 2N2007 and control.Dividing potential drop and current-limiting circuit to the alternating current of Switching Power Supply input after over commutation obtains direct current Uin, by four large resistance R 1, R2, R3, R4 carries out dividing potential drop and current limliting.Protective circuit is passed through current-limiting resistance R6 and voltage stabilizing didoe D1 pressure limiting, the limit pressure limiting of high voltage above power management chip N1 of avoiding working; Electric power management circuit: power management chip N1 input is by detecting the voltage that is obtained by dividing potential drop and current-limiting circuit and protective circuit, and this input voltage is lower than particular value, and Vout will have a high level reset signal to produce (normal condition is for being higher than particular value).Feedback circuit: be switch power source output voltage process optocoupler feedback signal.Control circuit: transistor V1 is N road ditch voltage-type transistor, detects the output voltage of electric power management circuit, comes the feedback output voltage voltage of feedback control circuit.When the output high level, transistor V1 conducting drags down feedback voltage, Switching Power Supply quit work (normal condition is low level, does not affect feedback voltage).
In the present embodiment, D1 is the 5.1V voltage stabilizing didoe of leakage current 10uA, and the power management chip voltage threshold values that resets is the antiposition voltage management chip of 3.08V, and V1 is the metal-oxide-semiconductor 2N2007 of N road ditch.
Below only be described with regard to most preferred embodiment of the present invention, but can not be interpreted as it is limitations on claims.The present invention is not limited only to above embodiment, and its concrete structure allows to change.In every case the various variations of doing in the protection range of independent claims of the present invention are all in protection scope of the present invention.
Claims (8)
1. Switching Power Supply, comprise current rectifying and wave filtering circuit, switch power controller and high frequency transformer, the output of described current rectifying and wave filtering circuit is connected with the input of switch power controller, the output of described switch power controller is connected with the input of high frequency transformer, and the feedback end of described high frequency transformer is connected with the input of switch power controller; It is characterized in that: described Switching Power Supply comprises that also one crosses the low-voltage protection circuit that can block power stage when low at input voltage; the input voltage test side of described low-voltage protection circuit is connected with the output of current rectifying and wave filtering circuit; the feedback end of described low-voltage protection circuit is connected with high frequency transformer, and the break-make control end of described low-voltage protection circuit is connected with switch power controller.
2. Switching Power Supply according to claim 1, it is characterized in that: described low-voltage protection circuit comprises dividing potential drop and current-limiting circuit, electric power management circuit, control circuit and feedback circuit, and described dividing potential drop and current-limiting circuit are connected with electric power management circuit, control circuit, feedback circuit successively; Described dividing potential drop and current-limiting circuit also are connected with the output of current rectifying and wave filtering circuit; Described feedback circuit is connected with high frequency transformer; Described control circuit, feedback circuit also are connected with switch power controller.
3. Switching Power Supply according to claim 2, it is characterized in that: described low-voltage protection circuit also comprises a power protecting circuit for the protection of electric power management circuit, described power protecting circuit and dividing potential drop and current-limiting circuit, electric power management circuit are connected.
4. Switching Power Supply according to claim 2, it is characterized in that: described dividing potential drop and current-limiting circuit are composed in series successively by resistance R 1, resistance R 2, resistance R 3, resistance R 4, and described resistance R 1, resistance R 4 also are connected with the output of current rectifying and wave filtering circuit.
5. according to claim 2 or 4 described Switching Power Supplies, it is characterized in that: described electric power management circuit comprises power management chip, capacitor C 1 and resistance R 5, one end of described capacitor C 1 is connected with earth terminal, and the other end of described capacitor C 1 is connected with Vdd pin, the resistance R 4 of power management chip; One end of described resistance R 5 is connected with the Vout pin of power management chip; The VSS pin of described power management chip is connected with earth terminal.
6. according to claim 2 or 5 described Switching Power Supplies, it is characterized in that: described control circuit comprises the metal-oxide-semiconductor V1 of resistance R 7, capacitor C 2 and N road ditch, described resistance R 7, capacitor C 2 parallel connections; The end that described resistance R 7 is connected with capacitor C is connected with the other end of the G utmost point of metal-oxide-semiconductor V1, resistance R 5, and the other end that described resistance R 7 is connected with capacitor C, the S of metal-oxide-semiconductor V1 extremely all are connected with earth terminal; The D utmost point of described metal-oxide-semiconductor V1 is connected with switch power controller, feedback circuit.
7. according to claim 2 or 6 described Switching Power Supplies, it is characterized in that: described feedback circuit is an optical coupler E1, and the signal input part of described optical coupler E1 is connected with high frequency transformer; One contact of described optical coupler E1 signal output part is connected with earth terminal, and another contact of described optical coupler E1 signal output part is connected with the D utmost point, the switch power controller of metal-oxide-semiconductor V1.
8. Switching Power Supply according to claim 3; it is characterized in that: described power protecting circuit is by resistance R 6 and low-leakage current voltage stabilizing didoe D1; one end of described resistance R 6 is connected with resistance R 4; the other end of described resistance R 6 is connected with the negative electrode of diode D1, and the anode of described diode D1 is connected with earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210548445.4A CN103066820B (en) | 2012-12-17 | 2012-12-17 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210548445.4A CN103066820B (en) | 2012-12-17 | 2012-12-17 | Switching power supply |
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| Publication Number | Publication Date |
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| CN103066820A true CN103066820A (en) | 2013-04-24 |
| CN103066820B CN103066820B (en) | 2015-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210548445.4A Active CN103066820B (en) | 2012-12-17 | 2012-12-17 | Switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061091A (en) * | 2016-08-17 | 2016-10-26 | 衢州昀睿工业设计有限公司 | Control circuit for switching power supply |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201247946Y (en) * | 2008-07-30 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Under-voltage protection circuit and switch power circuit |
| CN101958527A (en) * | 2010-10-16 | 2011-01-26 | 深圳茂硕电源科技股份有限公司 | Boost type LED constant flow source under-voltage protection circuit |
| CN102231509A (en) * | 2011-06-21 | 2011-11-02 | 西安电子科技大学 | Undervoltage latch circuit capable of preventing error turning |
| CN202206124U (en) * | 2011-08-26 | 2012-04-25 | 深圳茂硕电子科技有限公司 | Power supply adopting simple and practical input undervoltage protection circuit |
| CN203071810U (en) * | 2012-12-17 | 2013-07-17 | 宁波新尚智能电气有限公司 | Switching power supply |
-
2012
- 2012-12-17 CN CN201210548445.4A patent/CN103066820B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201247946Y (en) * | 2008-07-30 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Under-voltage protection circuit and switch power circuit |
| CN101958527A (en) * | 2010-10-16 | 2011-01-26 | 深圳茂硕电源科技股份有限公司 | Boost type LED constant flow source under-voltage protection circuit |
| CN102231509A (en) * | 2011-06-21 | 2011-11-02 | 西安电子科技大学 | Undervoltage latch circuit capable of preventing error turning |
| CN202206124U (en) * | 2011-08-26 | 2012-04-25 | 深圳茂硕电子科技有限公司 | Power supply adopting simple and practical input undervoltage protection circuit |
| CN203071810U (en) * | 2012-12-17 | 2013-07-17 | 宁波新尚智能电气有限公司 | Switching power supply |
Non-Patent Citations (1)
| Title |
|---|
| 李学海: "电源监控器IMP809/810及其应用", 《今日电子》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061091A (en) * | 2016-08-17 | 2016-10-26 | 衢州昀睿工业设计有限公司 | Control circuit for switching power supply |
| CN106061091B (en) * | 2016-08-17 | 2018-05-15 | 衢州昀睿工业设计有限公司 | A kind of control circuit of Switching Power Supply |
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| Publication number | Publication date |
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| CN103066820B (en) | 2015-02-11 |
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Owner name: NINGBO SANXING INTELLIGENT ELECTRIC CO., LTD. Free format text: FORMER NAME: NINGBO XINSHANG INTELLIGENT ELECTRIC CO., LTD. |
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Address after: 315034 Ningbo, Jiangbei District, Zhejiang City, the town of Maple Bay Road, No. 16 Patentee after: Ningbo Samsung intelligent electric company limited Address before: 315200, Ningbo, Jiangbei District, Zhejiang province Miao City wonderful mountain thoroughbred field Patentee before: Ningbo Xinshang Intelligent Electronics Co., Ltd. |