CN103066820B - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN103066820B CN103066820B CN201210548445.4A CN201210548445A CN103066820B CN 103066820 B CN103066820 B CN 103066820B CN 201210548445 A CN201210548445 A CN 201210548445A CN 103066820 B CN103066820 B CN 103066820B
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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, and the wide and high efficiency feature of input range has been widely used in and has communicated, in the field such as household electrical appliances, industrial instrument.Although the input voltage range of Switching Power Supply is wide, but near some remote mountain areas, industrial working, still input voltage can be caused too low when electric loading is excessive, namely input voltage is lower than the input voltage range of Switching Power Supply, and then causes the power output of Switching Power Supply to damage power consumption equipment not.Therefore, for these reasons, urgently need a kind of low-voltage protection circuit, guarantee that input voltage can block power stage lower than during working range, to overcome the above problems.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the defect of above prior art, provides a kind of Switching Power Supply, and this circuit can block power stage at input voltage lower than during 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 also comprises one can block power stage low-voltage protection circuit when input voltage is too low; the input voltage measurement end 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 are also 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 are also connected with switch power controller.
Described low-voltage protection circuit also comprises one for the protection of the power protecting circuit 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 R1, resistance R2, resistance R3, resistance R4, and described resistance R1, resistance R4 are also connected with the output of current rectifying and wave filtering circuit.
Described electric power management circuit comprises power management chip, electric capacity C1 and resistance R5, and one end of described electric capacity C1 is connected with earth terminal, and the other end of described electric capacity C1 is connected with the Vdd pin of power management chip, resistance R4; One end of described resistance R5 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 R7, electric capacity C2 and N road ditch, and described resistance R7, electric capacity C2 are in parallel; Described resistance R7 is connected with the G pole of metal-oxide-semiconductor V1, the other end of resistance R5 with one end of electric capacity C2, and described resistance R7 is extremely all connected with earth terminal with the other end of electric capacity C2, the S of metal-oxide-semiconductor V1; The D pole 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 pole of metal-oxide-semiconductor V1, switch power controller.
Described power protecting circuit comprises resistance R6 and low-leakage current voltage stabilizing didoe D1, and one end of described resistance R6 is connected with resistance R4, and the other end of described resistance R6 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 made the work of Switching Power Supply shutdown switch power supply when input voltage is too low by this circuit, after input voltage meets scope, carry out work again, thus stablizes with can ensureing normal output power.Therefore this Switching Power Supply is applied in the environment near some remote mountain areas, industrial working, still input voltage can be caused too low when electric loading is excessive, namely input voltage is lower than the input voltage range of Switching Power Supply, in this case can the power stage of cutoff switch power supply, to avoid damaging power consumption equipment.Therefore, as can be seen from above description, the input voltage range of Switching Power Supply of the present invention is wider, and 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 sample input voltage values of dividing potential drop; when input voltage value is lower than set point; control circuit is outputed signal to by electric power management circuit; feed back to make output voltage and drag down, Switching Power Supply quits work.This circuit is owing to being real-time sampling, controlling ground in real time, and therefore sample rate is fast and protection time delay is short.
As improvement, described low-voltage protection circuit also comprises a power protecting circuit, can pressure limiting further by this circuit, with the normal work of protection power source management circuit.
As improvement; described control circuit comprises the metal-oxide-semiconductor V1 of resistance R7, electric capacity C2 and N road ditch; described protective circuit, by resistance R6 and low-leakage current voltage stabilizing didoe D1, owing to have employed above-mentioned low power dissipation electron device, therefore makes the power consumption of Switching Power Supply of the present invention lower.
Accompanying drawing explanation
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
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
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 is made up of quasi resonant control HFC0100 (without illustrating in figure) and peripheral circuit (without illustrating in figure) thereof; 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 also comprises one can block power stage low-voltage protection circuit when input voltage is too low, the input voltage measurement end of described low-voltage protection circuit is connected with the output of current rectifying and wave filtering circuit, for detecting 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, for the output voltage of sampling switch power supply, and by the supply of this voltage switch power controller, i.e. the FB pin of quasi resonant control HFC0100; The break-make control end of described low-voltage protection circuit is connected with switch power controller, for control switch power supply action whether.
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 are also 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 are also connected with switch power controller.
Described low-voltage protection circuit also comprises one for the protection of the power protecting circuit 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 R1, resistance R2, resistance R3, resistance R4, and described resistance R1, resistance R4 are also connected with the output of current rectifying and wave filtering circuit.
Described electric power management circuit comprises power management chip, electric capacity C1 and resistance R5, and one end of described electric capacity C1 is connected with earth terminal, and the other end of described electric capacity C1 is connected with the Vdd pin of power management chip, resistance R4; One end of described resistance R5 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 R7, electric capacity C2 and N road ditch, and described resistance R7, electric capacity C2 are in parallel; Described resistance R7 is connected with the G pole of metal-oxide-semiconductor V1, the other end of resistance R5 with one end of electric capacity C2, and described resistance R7 is extremely all connected with earth terminal with the other end of electric capacity C2, the S of metal-oxide-semiconductor V1; The D pole 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 (1,2 pin) of described optical coupler E1 is connected with high frequency transformer; One contact (3 pin) of described optical coupler E1 signal output part is connected with earth terminal, and another contact (4 pin) of described optical coupler E1 signal output part is connected with the D pole of metal-oxide-semiconductor V1, the FB pin of switch power controller.
Described power protecting circuit comprises resistance R6 and low-leakage current voltage stabilizing didoe D1, and one end of described resistance R6 is connected with resistance R4, and the other end of described resistance R6 is connected with the negative electrode of diode D1, and the anode of described diode D1 is connected with earth terminal.
During work, carry out sense switch power input voltage by power management chip IMP810T, control by N road ditch metal-oxide-semiconductor 2N2007 the feedback that optocoupler EL817 output feedack returns and control.Dividing potential drop and current-limiting circuit obtain after direct current Uin to the alternating current that Switching Power Supply inputs through over commutation, and by four large resistance R1, R2, R3, R4 carry out dividing potential drop and current limliting.Protective circuit, by current-limiting resistance R6 and voltage stabilizing didoe D1 pressure limiting, avoids nominal operating high voltage to exceed the limit pressure limiting of power management chip N1; Electric power management circuit: power management chip N1 input is by detecting the voltage obtained by dividing potential drop and current-limiting circuit and protective circuit; this input voltage is lower than particular value, and Vout will have a high level reset signal to produce (normal condition is higher than particular value).Feedback circuit: for switch power source output voltage is through opto-coupled feedback signal.Control circuit: transistor V1 is N road ditch voltage-type transistor, detects the output voltage of electric power management circuit, carrys out the fed-back output voltage voltage of feedback control circuit.When output high level, transistor V1 conducting, drags down feedback voltage, and Switching Power Supply quits 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 power management chip voltage amplitude threshold values is the antiposition voltage management chip of 3.08V, and V1 is the metal-oxide-semiconductor 2N2007 of N road ditch.
Below only just most preferred embodiment of the present invention is described, 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 change done in the protection range of independent claims of the present invention is all in protection scope of the present invention.
Claims (3)
1. a 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 also comprises one can block power stage low-voltage protection circuit when input voltage is too low, the input voltage measurement end 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 are also 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 are also connected with switch power controller; Described low-voltage protection circuit also comprises one for the protection of the power protecting circuit 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 R1, resistance R2, resistance R3, resistance R4, and described resistance R1, resistance R4 are also connected with the output of current rectifying and wave filtering circuit; Described electric power management circuit comprises power management chip, electric capacity C1 and resistance R5, and one end of described electric capacity C1 is connected with earth terminal, and the other end of described electric capacity C1 is connected with the Vdd pin of power management chip, resistance R4; One end of described resistance R5 is connected with the Vout pin of power management chip; The VSS pin of described power management chip is connected with earth terminal; Described power protecting circuit comprises resistance R6 and low-leakage current voltage stabilizing didoe D1, and one end of described resistance R6 is connected with resistance R4, and the other end of described resistance R6 is connected with the negative electrode of diode D1, and the anode of described diode D1 is connected with earth terminal.
2. Switching Power Supply according to claim 1, is characterized in that: described control circuit comprises the metal-oxide-semiconductor V1 of resistance R7, electric capacity C2 and N road ditch, and described resistance R7, electric capacity C2 are in parallel; Described resistance R7 is connected with the G pole of metal-oxide-semiconductor V1, the other end of resistance R5 with one end of electric capacity C2, and described resistance R7 is extremely all connected with earth terminal with the other end of electric capacity C2, the S of metal-oxide-semiconductor V1; The D pole of described metal-oxide-semiconductor V1 is connected with switch power controller, feedback circuit.
3. Switching Power Supply according to claim 2, 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 pole of metal-oxide-semiconductor V1, switch power controller.
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 CN103066820A (en) | 2013-04-24 |
| CN103066820B true CN103066820B (en) | 2015-02-11 |
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| CN201210548445.4A Active CN103066820B (en) | 2012-12-17 | 2012-12-17 | Switching power supply |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| 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 |
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| 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)
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| 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 |
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| 电源监控器IMP809/810及其应用;李学海;《今日电子》;20010930(第09期);第17-18页 * |
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| CN103066820A (en) | 2013-04-24 |
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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. |