CN201256282Y - High stability output overvoltage protection circuit - Google Patents
High stability output overvoltage protection circuit Download PDFInfo
- Publication number
- CN201256282Y CN201256282Y CNU2008200960557U CN200820096055U CN201256282Y CN 201256282 Y CN201256282 Y CN 201256282Y CN U2008200960557 U CNU2008200960557 U CN U2008200960557U CN 200820096055 U CN200820096055 U CN 200820096055U CN 201256282 Y CN201256282 Y CN 201256282Y
- Authority
- CN
- China
- Prior art keywords
- output
- operational amplifier
- circuit
- protection circuit
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a high stability output over-voltage protection circuit, which comprises a voltage reference, a voltage division and sampling circuit and an operational amplifier, wherein the output end of the voltage reference is connected with the anti-phase input end of the operational amplifier, and the output end of the voltage division and sampling circuit is connected with the same phase input end of the operational amplifier. The high stability output over-voltage protection circuit further comprises a positive-feedback circuit connected between the same phase input end and the output end of the operational amplifier, wherein the positive-feedback circuit is provided with a diode and a variable potentiometer connected between the same phase input end and the output end of the operational amplifier. An output over-voltage protection circuit in the prior art has the shortcomings of big temperature difference, easy false action, limited application occasions and big power consumption. The high stability output over-voltage protection circuit can achieve wide temperature scope work, increases anti-interference capability of circuits, and can simultaneously achieve cutting and locking of high and low levels, and lowers power consumption of an integral circuit.
Description
Technical field
The utility model relates to the overvoltage protection of controller, more particularly, relates to a kind of high stability output over-voltage protection circuit.
Background technology
In the time of equipment work; if the unexpected increase of operating voltage will cause damage to equipment; usually need an overvoltage crowbar that equipment is protected; when output voltage during greater than the reference voltage set; will turn-off output and locked, there are following two big classes in the locked protection of output overvoltage relatively more commonly used now:
1, the first kind mainly is by triode, resistance, the locked circuit of output overvoltage that electric capacity is formed, with application number is 03244384.6, title is that the utility model of " voltage-stabilizing switch power source and electronic equipment with overvoltage output protection circuit " is an example, the locked circuit of output overvoltage is mainly by diode D2 and triode Q3, Q4 forms, because Q3, Q4 is triode, its parameter varies with temperature greatly, it is bigger also to be that temperature is waftd, cause under low temperature and high-temperature condition, this circuit can be locked not dead or misoperation, make circuit can not the adaptive temperature claimed range the wide and high occasion of output overvoltage required precision, the while power consumption greatly also is a shortcoming of this circuit;
2; second class mainly is by amplifier; resistance; the locked circuit of output overvoltage that electric capacity is formed; with application number is 200520036312.4; title is that the utility model of " Switching Power Supply parallel operation system and output over-voltage protection circuit thereof " is an example; the locked circuit of output overvoltage mainly is the feedback circuit that relies on diode D2 and amplifier U1 to form; output HIGH voltage goes locked; but the feedback by diode D2 is very strong; cause misoperation easily; particularly under high-temperature condition; for no reason crash when causing system's operation; and this circuit OFF end output high level, the occasion that makes some low levels turn-off is used and has been obtained restriction.
Therefore, warm big, the easy misoperation of wafing of the existence of the output over-voltage protection circuit on the prior art, the defective that applicable situation is restricted, power consumption is big.
The utility model content
The technical problems to be solved in the utility model is, at the above-mentioned temperature of prior art float greatly, easily misoperation, low level turn-off the defective unavailable, that power consumption is big, and a kind of output over-voltage protection circuit with high stability is provided.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of high stability output over-voltage protection circuit; comprise reference voltage source; pressure sampling circuit and operational amplifier; the output of described reference voltage source is connected with the inverting input of described operational amplifier; the output of described pressure sampling circuit is connected with the in-phase input end of described operational amplifier; described output over-voltage protection circuit also comprises the in-phase input end that is connected described operational amplifier and the regenerative circuit between the output, and described regenerative circuit is provided with in-phase input end and diode D5 between the output and the adjustable potentiometer R13 that is connected on described operational amplifier.
In high stability output over-voltage protection circuit described in the utility model; described reference voltage source comprises resistance R 8, R12, capacitor C 7 and a reference source chip Q7; resistance R 8 is connected between the input of power supply VCC and a reference source chip Q7; resistance R 12 is connected between the output of the inverting input of operational amplifier and a reference source chip Q7, and capacitor C 7 is connected between the output and ground of a reference source chip Q7.
In high stability output over-voltage protection circuit described in the utility model; described pressure sampling circuit comprises resistance R 10, R14 and capacitor C 8; resistance R 10 is connected between the in-phase input end of output voltage VO UT and operational amplifier, and resistance R 14 and capacitor C 8 are connected in parallel between the in-phase input end and ground of operational amplifier.
In high stability output over-voltage protection circuit described in the utility model, described output over-voltage protection circuit also comprises the high-low level change-over circuit between the Enable Pin EN of the output that is connected described operational amplifier and controller.
In high stability output over-voltage protection circuit described in the utility model; described high-low level change-over circuit comprises resistance R 11, capacitor C 6 and transistor Q4; resistance R 11 is connected between the grid of the output of operational amplifier and transistor Q4; capacitor C 6 is connected between the grid and source electrode of transistor Q4; the drain electrode of transistor Q4 connects the Enable Pin EN of controller, source ground.
Implement high stability output over-voltage protection circuit of the present utility model; has following beneficial effect: by in regenerative circuit, increasing an adjustable potentiometer and increasing a high-low level change-over circuit at the output of operational amplifier; can realize wide temperature range work (40 degree are to+85 degree); the antijamming capability of intensifier circuit; can realize simultaneously that high and low level is turn-offed and power consumption locked and the reduction entire circuit; so improved the reliability of complete machine; reduced the failure rate of complete machine; protect late-class circuit, made the utility model can be applicable to some high-end occasions.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram of the utility model high stability output over-voltage protection circuit.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect 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.
As shown in Figure 1; high stability output over-voltage protection circuit of the present utility model comprises reference voltage source 1, pressure sampling circuit 2 and operational amplifier 3; the output of reference voltage source 1 is connected with the inverting input of operational amplifier 3, and the output of pressure sampling circuit 2 is connected with the in-phase input end of operational amplifier 3.According to the utility model; shown output over-voltage protection circuit also comprises in-phase input end and the regenerative circuit between the output 4 that is connected operational amplifier 3, and regenerative circuit 4 is provided with in-phase input end and diode D5 between the output and the adjustable potentiometer R13 that is connected on operational amplifier 3.In addition, output over-voltage protection circuit of the present utility model also comprises the high-low level change-over circuit 5 between the Enable Pin EN of the output that is connected operational amplifier 3 and controller (not shown).
Reference voltage source 1 provides a reference voltage to be input to the inverting input of operational amplifier 3, and pressure sampling circuit 2 is then taken a sample to output voltage, and then is input to the in-phase input end of operational amplifier 3.When the voltage of pressure sampling circuit 2 sampling during greater than reference voltage, operational amplifier 3 is given high-low level change-over circuit 5 by high level of output, thereby makes the Enable Pin EN of controller be changed to low level, thereby turn-offs output.Simultaneously, regenerative circuit 4 feedback output voltages continue the retentive control device and turn-off no-output to operational amplifier 3, promptly form a locked circuit.
Reference voltage source 1 comprises resistance R 8, R12, capacitor C 7 and a reference source chip Q7, resistance R 8 is connected between the input of power supply VCC and a reference source chip Q7, resistance R 12 is connected between the output of the inverting input of operational amplifier 3 and a reference source chip Q7, and capacitor C 7 is connected between the output and ground of a reference source chip Q7.Pressure sampling circuit 2 comprises resistance R 10, R14 and capacitor C 8, and resistance R 10 is connected between the in-phase input end of output voltage VO UT and operational amplifier 3, and resistance R 14 and capacitor C 8 are connected in parallel between the in-phase input end and ground of operational amplifier 3.High-low level change-over circuit 5 comprises resistance R 11, capacitor C 6 and transistor Q4, resistance R 11 is connected between the grid of the output of operational amplifier 3 and transistor Q4, capacitor C 6 is connected between the grid and source electrode of transistor Q4, the drain electrode of transistor Q4 connects the Enable Pin EN of controller, source ground.
A reference source chip Q7 shown in the figure includes but not limited to a reference source chip shown in the figure, for example, when Q7 selected for use model to be a reference source chip of TL431, the reference voltage that obtains was 2.5V, when Q7 selected a reference source chip of model TL432 for use, the reference voltage that obtains was 1.25V.In addition, the transistor Q4 in the change-over circuit of high-low level shown in the figure 4 includes but not limited to transistor, and it can be triode and similar switching device, if consider the then preferred triode of production cost.
Resistance R 8 and a reference source chip Q7 form a reference voltage source, and resistance R 12 and capacitor C 7 are respectively amplifier input resistance and filter capacitor.U1A is an operational amplifier, and the input current of its requirement is minimum, so resistance R 8 values can be very big, the power that this part reference power supply consumes is in the milliwatt level.For avoiding a reference source chip Q7 to be subjected to ectocine, in its two ends parallel connection a capacitor C 7, can suppress to disturb, improve stability.
Resistance R 10 and R14 have formed a pressure sampling circuit 2, and it is used for output voltage VO UT is taken a sample, and then the reference voltage of delivering to U1 and providing with reference voltage source 1 compares.If output voltage is than reference voltage height, operational amplifier U1A then exports high level to high-low level change-over circuit 5, thereby makes the Enable Pin EN of controller be changed to low level, and then turn-offs output.Simultaneously, the regenerative circuit 4 that resistance R 13, diode D5 form, feedback output voltage continue to keep being output as high level, thereby the retentive control device turn-off no-output, has so formed a locked circuit to operational amplifier U1A.
R13 is an adjustable potentiometer, can regulate the intensity of feedback.If R13 is 0, feedback signal is very strong, causes interference signal that circuit is exerted an influence easily like this.After adding R13, can regulate feedback intensity, thus noise immunity that can regulating circuit.
Resistance R 11, capacitor C 6 and transistor Q4 form high-low level change-over circuit 4, thereby realize low level shutoff controller.Need high level if controller turn-offs, then directly give controller by resistance R 11 output high level.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; any modification of being done within every spirit of the present utility model and the principle, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1; a kind of high stability output over-voltage protection circuit; comprise reference voltage source (1); pressure sampling circuit (2) and operational amplifier (3); the output of described reference voltage source (1) is connected with the inverting input of described operational amplifier (3); the output of described pressure sampling circuit (2) is connected with the in-phase input end of described operational amplifier (3); it is characterized in that; described output over-voltage protection circuit also comprises in-phase input end and the regenerative circuit between the output (4) that is connected described operational amplifier (3), and described regenerative circuit (4) is provided with in-phase input end and diode D5 between the output and the adjustable potentiometer R13 that is connected on described operational amplifier (3).
2, high stability output over-voltage protection circuit according to claim 1; it is characterized in that; described reference voltage source (1) comprises resistance R 8, R12, capacitor C 7 and a reference source chip Q7; resistance R 8 is connected between the input of power supply VCC and a reference source chip Q7; resistance R 12 is connected between the output of the inverting input of operational amplifier (3) and a reference source chip Q7, and capacitor C 7 is connected between the output and ground of a reference source chip Q7.
3, high stability output over-voltage protection circuit according to claim 1; it is characterized in that; described pressure sampling circuit (2) comprises resistance R 10, R14 and capacitor C 8; resistance R 10 is connected between the in-phase input end of output voltage VO UT and operational amplifier (3), and resistance R 14 and capacitor C 8 are connected in parallel between the in-phase input end and ground of operational amplifier (3).
4, high stability output over-voltage protection circuit according to claim 1; it is characterized in that described output over-voltage protection circuit also comprises the high-low level change-over circuit (5) between the Enable Pin EN of the output that is connected described operational amplifier (3) and controller.
5, high stability output over-voltage protection circuit according to claim 4; it is characterized in that; described high-low level change-over circuit (5) comprises resistance R 11, capacitor C 6 and transistor Q4; resistance R 11 is connected between the grid of the output of operational amplifier (3) and transistor Q4; capacitor C 6 is connected between the grid and source electrode of transistor Q4; the drain electrode of transistor Q4 connects the Enable Pin EN of controller, source ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200960557U CN201256282Y (en) | 2008-08-01 | 2008-08-01 | High stability output overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200960557U CN201256282Y (en) | 2008-08-01 | 2008-08-01 | High stability output overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201256282Y true CN201256282Y (en) | 2009-06-10 |
Family
ID=40739609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200960557U Expired - Fee Related CN201256282Y (en) | 2008-08-01 | 2008-08-01 | High stability output overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201256282Y (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983720A (en) * | 2012-11-30 | 2013-03-20 | 西安智海电力科技有限公司 | Safe output-current-limiting automatic polarity identification directional power switching circuit |
| CN104426124A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and lamp with overvoltage protection function |
| CN104717774A (en) * | 2013-12-16 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Lamp over-voltage protection circuit and lighting equipment |
| CN106644114A (en) * | 2017-01-06 | 2017-05-10 | 四川埃姆克伺服科技有限公司 | Temperature sensor signal processing circuit |
| CN107658941A (en) * | 2017-10-26 | 2018-02-02 | 国网江苏省电力公司南京供电公司 | A kind of charging device of vehicle-based generator set direct current operative power source |
| CN107769675A (en) * | 2017-10-18 | 2018-03-06 | 天津市三源电力设备制造有限公司 | A kind of discharging circuit of direct current generator |
| CN108270199A (en) * | 2018-03-28 | 2018-07-10 | 广州金升阳科技有限公司 | A kind of output overvoltage protection circuit |
| CN108539977A (en) * | 2018-05-14 | 2018-09-14 | 武汉华星光电半导体显示技术有限公司 | Protect circuit and display panel |
| CN110445395A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Wide-voltage range direct current input switch power supply |
| US10778004B2 (en) | 2018-05-14 | 2020-09-15 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Protection circuit and display panel |
| CN111722663A (en) * | 2020-07-06 | 2020-09-29 | 深圳市汇业达通讯技术有限公司 | Self-locking overvoltage protection circuit |
| CN112711285A (en) * | 2020-12-22 | 2021-04-27 | 深圳市艾尔曼医疗电子仪器有限公司 | Programmable high-voltage reference unit circuit and high-voltage reference source |
-
2008
- 2008-08-01 CN CNU2008200960557U patent/CN201256282Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983720A (en) * | 2012-11-30 | 2013-03-20 | 西安智海电力科技有限公司 | Safe output-current-limiting automatic polarity identification directional power switching circuit |
| CN102983720B (en) * | 2012-11-30 | 2015-01-21 | 西安智海电力科技有限公司 | Safe output-current-limiting automatic polarity identification directional power switching circuit |
| CN104426124A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and lamp with overvoltage protection function |
| CN104717774A (en) * | 2013-12-16 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Lamp over-voltage protection circuit and lighting equipment |
| CN106644114A (en) * | 2017-01-06 | 2017-05-10 | 四川埃姆克伺服科技有限公司 | Temperature sensor signal processing circuit |
| CN107769675A (en) * | 2017-10-18 | 2018-03-06 | 天津市三源电力设备制造有限公司 | A kind of discharging circuit of direct current generator |
| CN107658941A (en) * | 2017-10-26 | 2018-02-02 | 国网江苏省电力公司南京供电公司 | A kind of charging device of vehicle-based generator set direct current operative power source |
| CN108270199A (en) * | 2018-03-28 | 2018-07-10 | 广州金升阳科技有限公司 | A kind of output overvoltage protection circuit |
| CN108270199B (en) * | 2018-03-28 | 2023-12-12 | 广州金升阳科技有限公司 | Output overvoltage protection circuit |
| CN108539977A (en) * | 2018-05-14 | 2018-09-14 | 武汉华星光电半导体显示技术有限公司 | Protect circuit and display panel |
| US10778004B2 (en) | 2018-05-14 | 2020-09-15 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Protection circuit and display panel |
| CN110445395A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Wide-voltage range direct current input switch power supply |
| CN111722663A (en) * | 2020-07-06 | 2020-09-29 | 深圳市汇业达通讯技术有限公司 | Self-locking overvoltage protection circuit |
| CN112711285A (en) * | 2020-12-22 | 2021-04-27 | 深圳市艾尔曼医疗电子仪器有限公司 | Programmable high-voltage reference unit circuit and high-voltage reference source |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201256282Y (en) | High stability output overvoltage protection circuit | |
| CN204156500U (en) | Overcurrent-overvoltage protecting circuit | |
| CN203674696U (en) | Short circuit protection circuit | |
| CN201523211U (en) | Power circuit of finished electric automobile controller | |
| CN103885382B (en) | PLC output circuit with overcurrent protection | |
| CN105610129B (en) | Over voltage protects control circuit | |
| CN204361658U (en) | A kind of under-voltage protecting circuit | |
| CN204258271U (en) | A kind of under-voltage protective switch of the short circuit supply unit | |
| CN103441471B (en) | A kind of three tunnels export the current foldback circuit of DC/DC converter | |
| CN112769093B (en) | Current-limiting control circuit, chip and power supply | |
| CN201038731Y (en) | Overvoltage protection circuit | |
| CN201349125Y (en) | Short-circuit protection circuit for voltage stabilizer | |
| CN201656951U (en) | Insulated gate bipolar translator drive circuit | |
| CN204190483U (en) | Power supply switch circuit | |
| CN207283384U (en) | A kind of feedback regulation control circuit and Switching Power Supply | |
| CN101763134A (en) | Parallel voltage stabilizing circuit | |
| CN109613968A (en) | Power supply redundant output circuit with short-circuit protection | |
| CN203800576U (en) | Protection circuit of overcurrent and under current for MOS transistor output | |
| CN207652017U (en) | A kind of input undervoltage power-down protection circuit | |
| CN113690845B (en) | Power output protection control device | |
| CN202978910U (en) | Digital satellite receiver and LNB power supply control circuit thereof | |
| CN209497253U (en) | A kind of undervoltage lockout circuit and switching power source chip | |
| CN210640811U (en) | Switching power supply circuit capable of detecting current | |
| CN208298052U (en) | A kind of novel slew rate enhancing circuit, low pressure difference linear voltage regulator | |
| CN209608555U (en) | DC power supply with binary channel overvoltage protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: EVOC INTELLIGENT TECHNOLOGY CO., LTD. Assignor: Evoc Intelligent Technology Co., Ltd. Contract record no.: 2012610000049 Denomination of utility model: High stability output overvoltage protection circuit Granted publication date: 20090610 License type: Exclusive License Record date: 20120425 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090610 Termination date: 20130801 |