CN201307764Y - Power supply circuit with overvoltage protection function - Google Patents
Power supply circuit with overvoltage protection function Download PDFInfo
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- CN201307764Y CN201307764Y CNU2008202139112U CN200820213911U CN201307764Y CN 201307764 Y CN201307764 Y CN 201307764Y CN U2008202139112 U CNU2008202139112 U CN U2008202139112U CN 200820213911 U CN200820213911 U CN 200820213911U CN 201307764 Y CN201307764 Y CN 201307764Y
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Abstract
The utility model is applied to the field of power supply circuits, and provides a power supply circuit with overvoltage protection function, which comprises a filtering and rectifying circuit, a boosted circuit and a high-frequency conversion circuit sequentially connected with one another, the filtering and rectifying circuit is connected with the boosted circuit by a switch, the power supply circuit also includes: an input overvoltage protection circuit that is connected between the filtering and rectifying circuit and the boosted circuit and controls the on or off of the switch; and an overvoltage detection circuit that is connected with the input overvoltage protection circuit, triggers the input overvoltage protection circuit to shut off the switch when the input voltage is excessive, and triggers the input overvoltage protection circuit to turn on the switch when the input voltage is not excessive through detecting the magnitude of the input voltage. In the utility model, a main circuit of the power supply circuit will not cause internal parts of the power supply to be broken due to high voltage after the overvoltage action, and the operation can be restored automatically after eliminating the overvoltage action.
Description
Technical field
The utility model belongs to the power circuit field, relates in particular to a kind of power circuit with over-voltage protecting function.
Background technology
Switching Power Supply in use, the input voltage that input voltage may produce unusual so that equipment can not guarantee.If this thing happens, will cause the Switching Power Supply cisco unity malfunction, even can cause this power supply internal components and relevant device thereof to be damaged, severe patient also can cause accidents such as fire, blast.Therefore, it is important increasing suitable OVP (Over Voltage Protection, overvoltage protection) circuit to power supply.
Industry is when using Switching Power Supply, in order to realize the electrical source input overvoltage protection function, the overvoltage crowbar control chip that conventional method is to use voltage comparator circuit and several discrete component to constitute at present.The shortcoming of this method is often to cause Switching Power Supply still will bear high pressure at overvoltage action back main circuit to cause this power supply internal components to damage, and removes and can not resume work automatically after overvoltage is moved.
The utility model content
The purpose of this utility model is to provide a kind of power circuit with over-voltage protecting function; be intended to solve present power supply and still will bear high pressure at overvoltage action back main circuit and cause this power supply internal components to damage, remove the problem that to resume work automatically after the overvoltage/undervoltage action.
The utility model is to realize like this; a kind of power circuit with over-voltage protecting function; comprise the filter rectifier, booster circuit, the high frequency conversion circuit that connect successively, described filter rectifier is connected by a switch with described booster circuit, and described power circuit also comprises:
Be connected between described filter rectifier and the described booster circuit, control the protection circuit against input over-voltage of described switch connection or shutoff;
Be connected with described protection circuit against input over-voltage, when the input voltage overvoltage, control described protection circuit against input over-voltage described switch is turn-offed, when the input voltage overvoltage disappears, control the over-voltage detection circuit of described protection circuit against input over-voltage described switch connection.
In the utility model; between filter rectifier and booster circuit, add a protection circuit against input over-voltage; when the AC voltage that detects input has the overvoltage phenomenon; disconnect between this protection circuit against input over-voltage control filter rectifier and the booster circuit; when the AC electric voltage over press phenomenon that detects input disappears; connect between this protection circuit against input over-voltage control filter rectifier and the booster circuit; realize that power supply can not cause this power supply internal components to damage owing to bearing high pressure at overvoltage action back main circuit, and can resume work automatically after removing the overvoltage action.
Description of drawings
Fig. 1 is the structure principle chart of the power circuit with over-voltage protecting function that provides of the utility model embodiment;
Fig. 2 is a kind of specific implementation of power circuit shown in Figure 1.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Among the utility model embodiment; between filter rectifier and booster circuit, add a protection circuit against input over-voltage; when the AC voltage that detects input has the overvoltage phenomenon; disconnect between this protection circuit against input over-voltage control filter rectifier and the booster circuit; when the AC electric voltage over press phenomenon that detects input disappears, connect between this protection circuit against input over-voltage control filter rectifier and the booster circuit.
Fig. 1 shows the structural principle of the power circuit with over-voltage protecting function that the utility model embodiment provides, and for convenience of description, only shows the part relevant with present embodiment.
Power circuit comprises filter rectifier 11, booster circuit 13, the high frequency conversion circuit 14 that connects successively; filter rectifier 11 is connected by switch 12 with booster circuit 13; over-voltage detection circuit 15 is connected with protection circuit against input over-voltage 16; detect to detect whether overvoltage of input voltage; when the input voltage overvoltage; over-voltage detection circuit 15 control protection circuit against input over-voltage 16 turn-off switch 12; when the input voltage overvoltage disappeared, over-voltage detection circuit 15 control protection circuit against input over-voltage 16 were connected switch 12.
Fig. 2 is a kind of specific implementation of power circuit shown in Figure 1, and wherein switch 12 is the switch of a relay, and this relay places protection circuit against input over-voltage.
With reference to Fig. 2; this power circuit comprises input detecting circuit 21; filter rectifier 22; protection circuit against input over-voltage 23; accessory power supply 24; over-voltage detection circuit 25; booster circuit 26; high frequency conversion circuit 27; current rectifying and wave filtering circuit 28 and control circuit 29; input detecting circuit 22 receives the AC voltage of input; be used to detect the input voltage size to trigger over-voltage detection circuit 25 control relay break-makes; filter rectifier 22 is connected with the output of input detecting circuit 21; with the AC voltage commutation of input is dc voltage; the anode of the first diode D1 in the output of filter rectifier 22 and the protection circuit against input over-voltage 23 is connected; the negative electrode of the first diode D1 is connected with first capacitor C 1; the other end of first capacitor C 1 is by second capacitor C, 2 ground connection; the first diode D1; first capacitor C 1; second capacitor C 2 has constituted the halfwave rectifier filter circuit; wherein first capacitor C, 1 two ends are parallel with first resistance R 1; the effect that second capacitor C, 2 two ends are parallel with second resistance R, 2, the first resistance R 1 and second resistance R 2 is to make C1; the equilibrium of C2 capacitance partial pressure.
The output of filter rectifier 22 is connected with the input 26 of booster circuit by the switch of a relay simultaneously, the output of booster circuit 26 connects the anode of the second diode D2, and the negative electrode of the second diode D2 is connected to the junction of the first diode D1 and first capacitor C 1.The output of booster circuit 26 connects the input of high frequency conversion circuit 27 simultaneously, and the output of high frequency varying circuit 27 is connected with the output of current rectifying and wave filtering circuit 28, finally by current rectifying and wave filtering circuit 28 to the load output dc voltage.
The negative electrode of the first diode D1 is connected with the input of accessory power supply 24; the output of accessory power supply 24 is connected with first end 1 of power switch pipe Q1; second end 2 of power switch pipe Q1 is connected with an end of the coil of relay; the other end ground connection of the coil of relay; the coil voltage of considering relay can not suddenly change and may be breakdown in outage moment, be parallel with at the relay two ends sustained diode 3 with outage moment with coil shorted on both ends and then protection relay.The control end 3 of power switch pipe Q1 is connected with its first end 1 by the 3rd resistance R 3, the input of over-voltage detection circuit 25 is connected with the output of accessory power supply 24, and the output of over-voltage detection circuit 25 is connected with the control end 3 of power switch pipe Q1 by the 4th resistance R 4.In the present embodiment, power switch pipe Q1 adopts a positive-negative-positive triode to realize, first end 1 is the emitter of positive-negative-positive triode, second end 2 is the collector electrode of positive-negative-positive triode, control end 3 is the base stage of positive-negative-positive triode, when should be appreciated that concrete enforcement, power switch pipe Q1 can also adopt NPN type triode or metal-oxide-semiconductor to realize.
For making dc voltage keep stable to load output, between the feedback end of the output of current rectifying and wave filtering circuit 28 and high frequency conversion circuit 27, also be connected with a control circuit 29, detect in real time with dc voltage, and feed back to high frequency conversion circuit 27 and adjust current rectifying and wave filtering circuit 28 output.Control circuit 29 comprises area circuit 291, comparison circuit 292, reference power circuit 293, pulse-width modulation circuit 294 and oscillating circuit 295, the input of sample circuit 291 is connected with the output of current rectifying and wave filtering circuit 28, the output of sample circuit 291 is connected with the first input end of comparison circuit 292, reference power circuit 293 is connected with second input of comparison circuit 292, the output of comparison circuit 292 is connected with the input of pulse-width modulation circuit 294, the clock signal terminal of pulse-width modulation circuit 294 is connected with oscillating circuit 295, and the output of pulse-width modulation circuit 294 is connected with the feedback end of high frequency conversion circuit 27.When sample circuit 291 detects the DC output voltage of filter rectifier 28 when unusual, to comparison circuit 292 outputs one sampling voltage, comparison circuit 292 with the reference power supply of this sampling voltage and reference power circuit 293 relatively after, produce a difference voltage and export pulse-width modulation circuit 294 to, pulse-width modulation circuit 294 is exported a pulse-width signal according to this interpolation voltage signal to high frequency conversion circuit 27, frequency to the output voltage of pulse-width modulation circuit 294 is adjusted, and keeps stable so that finally export the dc voltage of load to.
Be that the positive-negative-positive triode is the operation principle that example is described the power circuit with over-voltage protecting function that the utility model embodiment provides with power switch pipe Q1 below.
AC voltage just often (as 85-299VAC) when input, AC voltage is earlier after filter rectifier 22 and by the first diode D1, first capacitor C 1, after the halfwave rectifier filter circuit rectifying and wave-filtering that second capacitor C 2 constitutes, accessory power supply 24 gets electric work, the output output low level signal of over-voltage detection circuit 25, power switch pipe Q1 conducting this moment, thereby relay coil has electric current to pass through, relay switch is connected, thereby filter rectifier 22 and booster circuit 26 form path, booster circuit 26 is started working, cause the second diode D2 positively biased and the first diode D1 is anti-inclined to one side, this moment, the power supply of node HV1 was stable, thereby power circuit can be to the normal output dc voltage of load.
When the AC electric voltage over press of importing is unusual (as 310VAC); input detecting circuit 22 is exported high level after detecting overvoltage; trigger over-voltage detection circuit 25 output high level; therefore node VB is a high level; cause power switch pipe Q1 to turn-off, thereby relay turn-offs, booster circuit 26 does not have input; power supply stops to power to the load, and realizes that circuit input overvoltage detects defencive function.
When overvoltage disappeared, over-voltage detection circuit 25 is output low level again, power switch pipe Q1 conducting once more, and relay restarts, and power up powers to the load.
Among the utility model embodiment, between filter rectifier and booster circuit, add a protection circuit against input over-voltage, when the AC voltage that detects input has the overvoltage phenomenon, disconnect between this protection circuit against input over-voltage control filter rectifier and the booster circuit, when the AC electric voltage over press phenomenon that detects input disappears, connect between this protection circuit against input over-voltage control filter rectifier and the booster circuit, realize that power supply can not cause this power supply internal components to damage owing to bearing high pressure at overvoltage action back main circuit, and can resume work automatically after removing the overvoltage action; And the use of control circuit also helps to guarantee to the stable dc voltage of load output.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1, a kind of power circuit with over-voltage protecting function; comprise the filter rectifier, booster circuit, the high frequency conversion circuit that connect successively; it is characterized in that described filter rectifier is connected by a switch with described booster circuit, described power circuit also comprises:
Be connected between described filter rectifier and the described booster circuit, control the protection circuit against input over-voltage of described switch connection or shutoff;
Be connected with described protection circuit against input over-voltage, when the input voltage overvoltage, control described protection circuit against input over-voltage described switch is turn-offed, when the input voltage overvoltage disappears, control the over-voltage detection circuit of described protection circuit against input over-voltage described switch connection.
2, the power circuit with over-voltage protecting function as claimed in claim 1 is characterized in that, described power circuit also comprises an accessory power supply, and the output of described accessory power supply is connected with the input of described over-voltage detection circuit;
Described switch is the switch of a relay; Described relay places among the described protection circuit against input over-voltage; Described protection circuit against input over-voltage comprises:
First diode, its anode is connected with described filter rectifier output, and its negative electrode is connected with the input of described accessory power supply;
First electric capacity, the one end is connected with the negative electrode of described first diode, and two ends are parallel with first resistance;
Second electric capacity, the one end is connected with the other end of described first electric capacity, its other end ground connection, two ends are parallel with second resistance;
Second diode, its anode is connected with the output of described booster circuit, and its negative electrode is connected with an end of described first electric capacity;
Power switch pipe, its first end is connected with the output of described accessory power supply, its second end is connected with an end of the coil of described relay, its control end is connected with the output of described over-voltage detection circuit, described over-voltage detection circuit is by detecting the size of input voltage, when the input voltage overvoltage, control described power switch pipe and turn-off, when the input voltage overvoltage disappears, control described power switch pipe conducting; The other end ground connection of the coil of described relay.
3, the power circuit with over-voltage protecting function as claimed in claim 2 is characterized in that, described power switch pipe is a positive-negative-positive triode, and its first end is an emitter, and its second end is a collector electrode, and its control end is a base stage; Be connected with the 3rd resistance between its emitter and the base stage.
4, as claim 2 or 3 described power circuits, it is characterized in that the two ends of the coil of described relay are connected with the 3rd triode with over-voltage protecting function.
5, the power circuit with over-voltage protecting function as claimed in claim 1 is characterized in that, described power circuit also comprises:
Be connected with the input of described filter rectifier, detect the input detecting circuit of the AC voltage of input, when the input voltage overvoltage, trigger described over-voltage detection circuit output control signal, described switch is turn-offed to control described protection circuit against input over-voltage; When disappearing, the input voltage overvoltage triggers described over-voltage detection circuit output control signal, to control described protection circuit against input over-voltage with described switch connection.
6, the power circuit with over-voltage protecting function as claimed in claim 1 is characterized in that, described power circuit also comprises:
Be connected in the output of described high frequency conversion circuit and the current rectifying and wave filtering circuit between the load.
7, the power circuit with over-voltage protecting function as claimed in claim 6 is characterized in that, described power circuit also comprises:
Be connected in the control circuit between the feedback end of the output of described current rectifying and wave filtering circuit and described high frequency conversion circuit, the dc voltage of described current rectifying and wave filtering circuit output is detected in real time, and feed back to described high frequency conversion circuit and adjust.
8, the power circuit with over-voltage protecting function as claimed in claim 7 is characterized in that, described control circuit comprises:
Sample circuit, its input is connected with the output of described current rectifying and wave filtering circuit;
Reference power circuit;
Comparison circuit, its first input end is connected with the output of described sample circuit, and second input is connected with described reference power circuit output;
Oscillating circuit;
Pulse-width modulation circuit, its clock signal terminal is connected with described oscillating circuit, and input is connected with described comparison circuit output, and output is connected with described high frequency conversion circuit feedback end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202139112U CN201307764Y (en) | 2008-11-26 | 2008-11-26 | Power supply circuit with overvoltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202139112U CN201307764Y (en) | 2008-11-26 | 2008-11-26 | Power supply circuit with overvoltage protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201307764Y true CN201307764Y (en) | 2009-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202139112U Expired - Fee Related CN201307764Y (en) | 2008-11-26 | 2008-11-26 | Power supply circuit with overvoltage protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201307764Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064532A (en) * | 2011-01-12 | 2011-05-18 | 深圳茂硕电源科技股份有限公司 | Overvoltage protection circuit of input follower type |
| CN102332704A (en) * | 2011-09-26 | 2012-01-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | Switching power supply input undervoltage or overvoltage protection circuit |
| CN103474965A (en) * | 2013-08-27 | 2013-12-25 | 崧顺电子（深圳）有限公司 | Low-cost alternating-current input overvoltage protection circuit and switching power supply |
| CN110022076A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | A kind of rectification power circuit |
| CN112803756A (en) * | 2021-01-06 | 2021-05-14 | 成都国能龙源科技有限公司 | Output voltage overvoltage protection module incapable of automatic recovery |
-
2008
- 2008-11-26 CN CNU2008202139112U patent/CN201307764Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064532A (en) * | 2011-01-12 | 2011-05-18 | 深圳茂硕电源科技股份有限公司 | Overvoltage protection circuit of input follower type |
| CN102064532B (en) * | 2011-01-12 | 2013-07-03 | 茂硕电源科技股份有限公司 | Overvoltage protection circuit of input follower type |
| CN102332704A (en) * | 2011-09-26 | 2012-01-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | Switching power supply input undervoltage or overvoltage protection circuit |
| CN102332704B (en) * | 2011-09-26 | 2013-12-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Switching power supply input undervoltage or overvoltage protection circuit |
| CN103474965A (en) * | 2013-08-27 | 2013-12-25 | 崧顺电子（深圳）有限公司 | Low-cost alternating-current input overvoltage protection circuit and switching power supply |
| CN110022076A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | A kind of rectification power circuit |
| CN112803756A (en) * | 2021-01-06 | 2021-05-14 | 成都国能龙源科技有限公司 | Output voltage overvoltage protection module incapable of automatic recovery |
| CN112803756B (en) * | 2021-01-06 | 2022-06-10 | 成都国能龙源科技有限公司 | Output voltage overvoltage protection module incapable of automatic recovery |
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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 |
Granted publication date: 20090909 Termination date: 20141126 |
|
| EXPY | Termination of patent right or utility model |