CN103490388B - A kind of overvoltage and under-voltage protecting circuit - Google Patents
A kind of overvoltage and under-voltage protecting circuit Download PDFInfo
- Publication number
- CN103490388B CN103490388B CN201310469788.6A CN201310469788A CN103490388B CN 103490388 B CN103490388 B CN 103490388B CN 201310469788 A CN201310469788 A CN 201310469788A CN 103490388 B CN103490388 B CN 103490388B
- Authority
- CN
- China
- Prior art keywords
- resistance
- triode
- electric capacity
- stabilizing didoe
- voltage stabilizing
- 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
Abstract
A kind of overvoltage and under-voltage protecting circuit, it comprises connection under-voltage protecting circuit in a power, overvoltage crowbar and output control circuit, under-voltage protecting circuit is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C1, electric capacity C2, voltage stabilizing didoe DZ1, voltage stabilizing didoe DZ2, triode Q1 and triode Q2 forms, overvoltage crowbar is by resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C3, electric capacity C4, voltage stabilizing didoe DZ3, voltage stabilizing didoe DZ4, voltage stabilizing didoe DZ5, triode Q3 and triode Q4 forms, output control circuit is by resistance R11, electric capacity C5, MOS transistor Q5 and diode D1 forms.Present invention employs passive device, overvoltage and under-voltage protection can not only be carried out to power supply, and consume low in energy consumption, reaction speed is fast.
Description
Technical field
The present invention relates to a kind of electronic circuit, specifically a kind of overvoltage and under-voltage protecting circuit, belong to supply voltage switch resist technology field.
Background technology
When Switching Power Supply supply power voltage lower than or higher than normal working voltage certain value time, power supply all may be caused normally to work and even to damage.In order to solve the problem, people devise overvoltage, under-voltage protecting circuit, and overvoltage conventional at present and under-voltage protecting circuit use relay to be powered by another accessory power supply to control the object that its break-make reaches protection.Relay reaction speed is slow, and needs to provide a power supply to power to relay in addition, so not only cause power consumption to increase, and the protection of accessory power supply is also a problem.
Summary of the invention
For above-mentioned deficiency, the invention provides a kind of overvoltage and under-voltage protecting circuit, it can not only carry out overvoltage, under-voltage protection to power supply, and consumes low in energy consumption.
The technical solution adopted for the present invention to solve the technical problems is: a kind of overvoltage and under-voltage protecting circuit, comprise connection under-voltage protecting circuit in a power, overvoltage crowbar and output control circuit, it is characterized in that, described under-voltage protecting circuit is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C1, electric capacity C2, voltage stabilizing didoe DZ1, voltage stabilizing didoe DZ2, triode Q1 and triode Q2 forms, described overvoltage crowbar is by resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C3, electric capacity C4, voltage stabilizing didoe DZ3, voltage stabilizing didoe DZ4, voltage stabilizing didoe DZ5, triode Q3 and triode Q4 forms, described output control circuit is by resistance R11, electric capacity C5, transistor Q5 and diode D1 forms,
Wherein, resistance R1, resistance R2, resistance R3, resistance R6, resistance R7 is connected with the positive pole of power circuit with one end of resistance R8, the other end of described resistance R1 and one end of resistance R4, one end of resistance R5, the negative pole of voltage stabilizing didoe DZ2 is connected with one end of electric capacity C2, and the positive pole of described voltage stabilizing didoe DZ2 is connected with the base stage of one end of electric capacity C1 and triode Q2, the other end of described resistance R2 and the other end of electric capacity C1, the collector electrode of triode Q2 is connected with the negative pole of voltage stabilizing didoe DZ1, the other end of described resistance R3 and the other end of resistance R4, the collector electrode of triode Q1 is connected with the grid of transistor Q5, and the base stage of described triode Q1 is connected with the positive pole of voltage stabilizing didoe DZ1, the emitter of described triode Q1 and the other end of electric capacity C2, the other end of resistance R5, the emitter of triode Q2, the source electrode of transistor Q5 is connected with one end of electric capacity C5 and ground connection, the other end of described resistance R6 and one end of resistance R9, one end of resistance R10, the negative pole of voltage stabilizing didoe DZ4 is connected with one end of electric capacity C4, and the positive pole of described voltage stabilizing didoe DZ4 is connected with the base stage of one end of electric capacity C3 and triode Q4, the other end of described resistance R7 and the other end of electric capacity C3, the collector electrode of triode Q4, the negative pole of voltage stabilizing didoe DZ3 is connected with the grid of transistor Q5, the other end of described resistance R8 and the other end of resistance R9, the collector electrode of triode Q3 is connected with the negative pole of voltage stabilizing didoe DZ5, and the base stage of described triode Q3 is connected with the positive pole of voltage stabilizing didoe DZ3, the emitter of described triode Q3 and the other end of electric capacity C4, the other end of resistance R10, the emitter of triode Q4, the positive pole of voltage stabilizing didoe DZ5 is connected with power circuit input cathode and ground connection, the other end of described electric capacity C5 is connected with the negative pole of one end of resistance R11 and diode D1, and positive pole and the power circuit output end negative pole of the drain electrode of described transistor Q5 and the other end of resistance R11 and diode D1 are connected.
Preferably, described triode Q1, triode Q2, triode Q3 and triode Q4 all adopt NPN type triode.
Preferably, described transistor Q5 adopts N-type MOS transistor.
The present invention has following outstanding beneficial effect: after adopting said structure; overvoltage of the present invention and under-voltage protecting circuit have employed passive device; without the need to external power source; draw atomic little electric current from the input of power circuit namely to can be self circuit and power; it can not only carry out overvoltage and under-voltage protection to power supply, and consume low in energy consumption, reaction speed is fast.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is basic circuit diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of overvoltage of the present invention and under-voltage protecting circuit, it comprises connection under-voltage protecting circuit in a power, overvoltage crowbar and output control circuit, described under-voltage protecting circuit is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C1, electric capacity C2, voltage stabilizing didoe DZ1, voltage stabilizing didoe DZ2, NPN type triode Q1 and NPN type triode Q2 composition, described overvoltage crowbar is by resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C3, electric capacity C4, voltage stabilizing didoe DZ3, voltage stabilizing didoe DZ4, voltage stabilizing didoe DZ5, NPN type triode Q3 and NPN type triode Q4 composition, described output control circuit is by resistance R11, electric capacity C5, N-type MOS transistor Q5 and diode D1 forms,
Wherein, resistance R1, resistance R2, resistance R3, resistance R6, resistance R7 is connected with the positive pole of power circuit with one end of resistance R8, the other end of described resistance R1 and one end of resistance R4, one end of resistance R5, the negative pole of voltage stabilizing didoe DZ2 is connected with one end of electric capacity C2, the positive pole of described voltage stabilizing didoe DZ2 is connected with one end of electric capacity C1 and the base stage of NPN type triode Q2, the other end of described resistance R2 and the other end of electric capacity C1, the collector electrode of NPN type triode Q2 is connected with the negative pole of voltage stabilizing didoe DZ1, the other end of described resistance R3 and the other end of resistance R4, the collector electrode of NPN type triode Q1 is connected with the grid of N-type MOS transistor Q5, the base stage of described NPN type triode Q1 is connected with the positive pole of voltage stabilizing didoe DZ1, the emitter of described NPN type triode Q1 and the other end of electric capacity C2, the other end of resistance R5, the emitter of NPN type triode Q2, the source electrode of N-type MOS transistor Q5 is connected with one end of electric capacity C5 and ground connection, the other end of described resistance R6 and one end of resistance R9, one end of resistance R10, the negative pole of voltage stabilizing didoe DZ4 is connected with one end of electric capacity C4, the positive pole of described voltage stabilizing didoe DZ4 is connected with one end of electric capacity C3 and the base stage of NPN type triode Q4, the other end of described resistance R7 and the other end of electric capacity C3, the collector electrode of NPN type triode Q4, the negative pole of voltage stabilizing didoe DZ3 is connected with the grid of N-type MOS transistor Q5, the other end of described resistance R8 and the other end of resistance R9, the collector electrode of NPN type triode Q3 is connected with the negative pole of voltage stabilizing didoe DZ5, the base stage of described NPN type triode Q3 is connected with the positive pole of voltage stabilizing didoe DZ3, the emitter of described NPN type triode Q3 and the other end of electric capacity C4, the other end of resistance R10, the emitter of NPN type triode Q4, the positive pole of voltage stabilizing didoe DZ5 is connected with power circuit input cathode and ground connection, the other end of described electric capacity C5 is connected with the negative pole of one end of resistance R11 and diode D1, positive pole and the power circuit output end negative pole of the drain electrode of described N-type MOS transistor Q5 and the other end of resistance R11 and diode D1 are connected.
After overvoltage of the present invention and under-voltage protecting circuit are connected on the rectifier of Switching Power Supply, before filter capacitor, comprise the late-class circuit of filter capacitor in order to protection.Under-voltage protection mechanism of the present invention is; if through rectifier export voltage lower than set point time; the collector potential of NPN type triode Q2 rises; be raised to the time marquis making NPN type triode Q1 conducting; circuit state overturns, and NPN type triode Q1 is saturated, the grid potential of N-type MOS transistor Q5 is moved to very low; N-type MOS transistor Q5 disconnects, and late-class circuit can not get power supply.This circuit is similar to Schmidt circuit, has certain return difference, and therefore NPN type triode Q1 only can be operated in two states, and one is saturation condition, and two is complete off states, doing so avoids N-type MOS transistor Q5 and is operated in the loss that non-switch state causes.Similar, the mechanism of overvoltage crowbar of the present invention is, when the voltage exported through rectifier is higher than set point, the state of circuit overturns, and the collector potential of NPN type triode Q4 is dragged down, thus turns off N-type MOS transistor Q5, reaches the object of protection.
The above is the preferred embodiment of the present invention, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also regarded as protection scope of the present invention.
Claims (3)
1. an overvoltage and under-voltage protecting circuit, comprise connection under-voltage protecting circuit in a power, overvoltage crowbar and output control circuit, it is characterized in that, described under-voltage protecting circuit is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C1, electric capacity C2, voltage stabilizing didoe DZ1, voltage stabilizing didoe DZ2, triode Q1 and triode Q2 forms, described overvoltage crowbar is by resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C3, electric capacity C4, voltage stabilizing didoe DZ3, voltage stabilizing didoe DZ4, voltage stabilizing didoe DZ5, triode Q3 and triode Q4 forms, described output control circuit is by resistance R11, electric capacity C5, transistor Q5 and diode D1 forms,
Wherein, resistance R1, resistance R2, resistance R3, resistance R6, resistance R7 is connected with the positive pole of power circuit with one end of resistance R8, the other end of described resistance R1 and one end of resistance R4, one end of resistance R5, the negative pole of voltage stabilizing didoe DZ2 is connected with one end of electric capacity C2, and the positive pole of described voltage stabilizing didoe DZ2 is connected with the base stage of one end of electric capacity C1 and triode Q2, the other end of described resistance R2 and the other end of electric capacity C1, the collector electrode of triode Q2 is connected with the negative pole of voltage stabilizing didoe DZ1, the other end of described resistance R3 and the other end of resistance R4, the collector electrode of triode Q1 is connected with the grid of transistor Q5, and the base stage of described triode Q1 is connected with the positive pole of voltage stabilizing didoe DZ1, the emitter of described triode Q1 and the other end of electric capacity C2, the other end of resistance R5, the emitter of triode Q2, the source electrode of transistor Q5 is connected with one end of electric capacity C5 and ground connection, the other end of described resistance R6 and one end of resistance R9, one end of resistance R10, the negative pole of voltage stabilizing didoe DZ4 is connected with one end of electric capacity C4, and the positive pole of described voltage stabilizing didoe DZ4 is connected with the base stage of one end of electric capacity C3 and triode Q4, the other end of described resistance R7 and the other end of electric capacity C3, the collector electrode of triode Q4, the negative pole of voltage stabilizing didoe DZ3 is connected with the grid of transistor Q5, the other end of described resistance R8 and the other end of resistance R9, the collector electrode of triode Q3 is connected with the negative pole of voltage stabilizing didoe DZ5, and the base stage of described triode Q3 is connected with the positive pole of voltage stabilizing didoe DZ3, the emitter of described triode Q3 and the other end of electric capacity C4, the other end of resistance R10, the emitter of triode Q4, the positive pole of voltage stabilizing didoe DZ5 is connected with power circuit input cathode and ground connection, the other end of described electric capacity C5 is connected with the negative pole of one end of resistance R11 and diode D1, and positive pole and the power circuit output end negative pole of the drain electrode of described transistor Q5 and the other end of resistance R11 and diode D1 are connected.
2. a kind of overvoltage according to claim 1 and under-voltage protecting circuit, is characterized in that, described triode Q1, triode Q2, triode Q3 and triode Q4 all adopt NPN type triode.
3. a kind of overvoltage according to claim 1 and under-voltage protecting circuit, is characterized in that, described transistor Q5 adopts N-type MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310469788.6A CN103490388B (en) | 2013-10-10 | 2013-10-10 | A kind of overvoltage and under-voltage protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310469788.6A CN103490388B (en) | 2013-10-10 | 2013-10-10 | A kind of overvoltage and under-voltage protecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103490388A CN103490388A (en) | 2014-01-01 |
| CN103490388B true CN103490388B (en) | 2016-01-13 |
Family
ID=49830422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310469788.6A Expired - Fee Related CN103490388B (en) | 2013-10-10 | 2013-10-10 | A kind of overvoltage and under-voltage protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103490388B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119488A (en) * | 2015-10-09 | 2015-12-02 | 四川特伦特科技股份有限公司 | Multi-power-source CPCI (compact peripheral component interconnect) backplane |
| CN105634263A (en) * | 2016-04-12 | 2016-06-01 | 上海斐讯数据通信技术有限公司 | Protection circuit self-adaptive to input voltage |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2058470U (en) * | 1989-12-12 | 1990-06-20 | 广东专利技术开发公司 | Electric voltage and current combined protection type fully automatic air conditioner protector |
| CN101106263A (en) * | 2006-07-14 | 2008-01-16 | 吴本林 | Secure protector for power |
| CN201490685U (en) * | 2009-07-24 | 2010-05-26 | 深圳市中兴移动通信有限公司 | Multifunction power protection circuit |
| CN203562766U (en) * | 2013-10-10 | 2014-04-23 | 济南沃尔电子有限公司 | Over-voltage and under-voltage protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122813B (en) * | 2010-01-11 | 2015-11-25 | 日隆电子股份有限公司 | The switch embedded integrated circuit of protection battery and method |
-
2013
- 2013-10-10 CN CN201310469788.6A patent/CN103490388B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2058470U (en) * | 1989-12-12 | 1990-06-20 | 广东专利技术开发公司 | Electric voltage and current combined protection type fully automatic air conditioner protector |
| CN101106263A (en) * | 2006-07-14 | 2008-01-16 | 吴本林 | Secure protector for power |
| CN201490685U (en) * | 2009-07-24 | 2010-05-26 | 深圳市中兴移动通信有限公司 | Multifunction power protection circuit |
| CN203562766U (en) * | 2013-10-10 | 2014-04-23 | 济南沃尔电子有限公司 | Over-voltage and under-voltage protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103490388A (en) | 2014-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103474954B (en) | A kind of overvoltage based on three end adjustable shunt reference sources and under-voltage protecting circuit | |
| CN204804501U (en) | Electronic lock drive protection circuit | |
| CN103280765A (en) | Overvoltage protection circuit | |
| CN103683263A (en) | Circuit for preventing reverse plug in of direct current power supply and lamp | |
| CN212210475U (en) | Overcurrent and overvoltage self-locking protection circuit | |
| CN207117156U (en) | A kind of voltage protection circuit | |
| CN204068678U (en) | A kind of Switching Power Supply output over-voltage protection and thermal-shutdown circuit | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN203562766U (en) | Over-voltage and under-voltage protection circuit | |
| CN101651332B (en) | Power protection circuit preventing controlled silicon effect | |
| CN103490388B (en) | A kind of overvoltage and under-voltage protecting circuit | |
| CN203368003U (en) | Dual protection device for Boost circuit | |
| CN203193500U (en) | Switching power supply and charging loop thereof | |
| CN204180331U (en) | A kind of protective circuit of LED power | |
| CN204030963U (en) | A kind of washing machine stand-by circuit of super low-power consumption | |
| CN102969704A (en) | Pre-charging circuit | |
| CN203562754U (en) | Over-voltage and under-voltage protective circuit based on three-end adjustable shunt reference source | |
| CN203104307U (en) | Controllable common ground power supply circuit | |
| CN202797902U (en) | Short circuit protection circuit used for booster circuit | |
| CN204230891U (en) | A kind of anti-reverse power connection circuit | |
| CN203071813U (en) | Super-wide range switching power supply input control device | |
| CN202652057U (en) | Supply circuit for quick start of integrated circuit | |
| CN108288850B (en) | Voltage conversion input/output low-end conduction protection circuit | |
| CN205921529U (en) | Protection circuit and electronic product | |
| CN107425590B (en) | Solar power supply switching circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20160113 Termination date: 20161010 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |