CN105048404A - Power supply overvoltage protection method based on triode latch circuit - Google Patents
Power supply overvoltage protection method based on triode latch circuit Download PDFInfo
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- CN105048404A CN105048404A CN201510407106.8A CN201510407106A CN105048404A CN 105048404 A CN105048404 A CN 105048404A CN 201510407106 A CN201510407106 A CN 201510407106A CN 105048404 A CN105048404 A CN 105048404A
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Abstract
The invention discloses a power supply overvoltage protection method based on a triode latch circuit. The power supply overvoltage protection method connects the latch circuit with power supply pins of a power supply chip to lower power supply voltage of the chip when an overvoltage fault occurs, so as to turn off a power supply, wherein the latch circuit is composed of two triodes and two resistors. By adjusting resistance values of the resistors, whether to latch the latch circuit or not is controlled, and when the overvoltage fault occurs to the power supply, that protection is performed in a self-lock protection mode or an auto-restart mode is determined. Compared with the prior art, the power supply overvoltage protection method based on the triode latch circuit provides reliable protection when the overvoltage fault occurs, selects the overvoltage protection mode by adjusting device parameters, and is convenient and flexible and good in versatility in various protection designs of electronic circuits.
Description
Technical field
The present invention relates to power circuit over-voltage protection technology field, specifically a kind of power supply overvoltage protection method based on triode latch cicuit.
Background technology
Overvoltage protection is a pith in the defencive function of power circuit.The overvoltage protection of general power supply chip is self-locking type, and when magnitude of voltage reaches over-voltage protection point, protective circuit action, closes chip, only at failture evacuation and when again re-powering startup, chip just can be resumed work, i.e. self-locking type overvoltage protection.Another kind is autoboot type overvoltage protection, and namely after overvoltage occurs, protective circuit can restart after the power cutoff circuit a bit of time, if overvoltage fault is not removed, power supply can make repeated attempts and restart.The overvoltage protection of these a two kinds of patterns generally tool one in a power, once chip selection completes or circuit design complete after just fixing, and option and installment can not be carried out according to the actual needs in application.
Disclosed patent application document: the patent No. is " CN01130045.0 ", patent name is " a kind of insulated gate bipolar transistor IGBT drive protection circuit ", this document disclose one " insulated gate bipolar transistor IGBT drive protection circuit, it mainly comprises: power supply, insulated gate bipolar transistor IGBT, about one bridge drive signal circuit, optocoupler U501, a switch triode control circuit, a drive singal amplifying circuit, IGBT collector emitter voltage Vce detects and regulates protective circuit, this Vce detects and regulates protective circuit to comprise short-circuit protection circuit, fault latch circuit and fault soft breaking circuit, described Vce detects and regulates protective circuit when detecting that the collector emitter voltage Vce of insulated gate bipolar transistor IGBT is abnormal, control amplifying circuit by short-circuit protection circuit the grid voltage of described insulated gate bipolar transistor IGBT turned down to be less than its thresholding low voltage value, end to make described insulated gate bipolar transistor IGBT, and realize closed latch by fault latch circuit, ensure reliably block described insulated gate bipolar transistor IGBT before CPU receives fault-signal and blocks drive singal ".
The patent No. is " CN200710069762.7 ", and patent name is " a kind of compound level signal comparing latch unit ", this document discloses one " level signal comparing latch unit.The latch that technical problem to be solved is to provide should have can independent detection monitoring and protection multichannel varying level signal, good reliability, cost feature low, applied widely.Technical scheme is: a kind of compound level signal comparing latch unit, comprise the comparator that several outputs are connected, the first input end of each comparator is all as independent signal input, second input of each comparator is each self-corresponding reference level input, and the output of these comparators accesses common return through electric capacity C1 after being connected; This latch is also provided with triode Q1, its base stage connects the output of comparator, emitter connecting circuit voltage, collector electrode connects first input end and the output signal end of one of them comparator respectively, second input of this comparator by after a signal relief circuit as ring off signal input, circuit voltage also accesses the output of each comparator by resistance R4 ".
Circuit disclosed in above-mentioned open file, all exist circuit design complete after just fixing, and the problem of option and installment can not be carried out according to the actual needs in application, the flexibility of power protection is restricted.
Summary of the invention
Technical assignment of the present invention is to provide a kind of power supply overvoltage protection method based on triode latch cicuit.
Technical assignment of the present invention realizes in the following manner, the latch cicuit that this power supply overvoltage protection method forms mainly through two triodes and two resistance, this latch cicuit is connected with the energization pins of power supply chip, drags down chip power supply voltage, powered-down when overvoltage fault occurs; Whether control the latch of latch cicuit by adjusting resistance resistance, determine that power supply is when overvoltage fault occurs, and is protect with self-locking type protected mode, or protects with autoboot pattern.
Two described triodes are respectively PNP type triode and NPN type triode.
The power supply overvoltage protection circuit of this described power supply overvoltage protection method specifically connects as follows:
The base stage of PNP type triode is connected with the collector electrode of NPN type triode, and the emitter of PNP type triode is connected with the energization pins VDD of power supply chip, and the collector electrode of PNP type triode is connected with the base stage of NPN type triode; One end of resistance R1 is connected with the emitter of PNP type triode, and the other end is connected with the base stage of PNP type triode; One end of resistance R2 is connected with the collector electrode of PNP type triode, and the other end is connected with the emitter of NPN type triode; The emitter of NPN type triode is connected with the energization pins GND of power supply chip; One end of electric capacity C1 is connected with the emitter of PNP type triode and resistance R3, and the other end is connected with the emitter of NPN type triode.
A kind of power supply overvoltage protection method based on triode latch cicuit of the present invention compared to the prior art; not only can carry out reliably protecting to overvoltage fault; and overvoltage protection mode can be selected by adjustment device parameters wherein; circuit design is simple, with low cost, have good flexibility, and has good versatility in the various design protection of electronic circuit.It can be triggered by high level, also can be triggered by low level, can latch on triggering, also can not latch, and specifically can arrange according to actual needs.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of power supply overvoltage protection circuit figure of the power supply overvoltage protection method based on triode latch cicuit.
Accompanying drawing 2 is a kind of schematic diagram of triode latch cicuit of the power supply overvoltage protection method based on triode latch cicuit.
Embodiment
Embodiment 1:
This power supply overvoltage protection method is mainly through the latch cicuit of a PNP type triode, NPN type triode, a resistance R1 and resistance R2 composition, this latch cicuit is connected with energization pins VDD, the energization pins GND of power supply chip, chip power supply voltage is dragged down, powered-down when overvoltage fault occurs; Whether control the latch of latch cicuit by adjusting resistance resistance, determine that power supply is when overvoltage fault occurs, and is protect with self-locking type protected mode, or protects with autoboot pattern.
The power supply overvoltage protection circuit of this described power supply overvoltage protection method specifically connects as follows:
The base stage of PNP type triode is connected with the collector electrode of NPN type triode, and the emitter of PNP type triode is connected with the energization pins VDD of power supply chip, and the collector electrode of PNP type triode is connected with the base stage of NPN type triode; One end of resistance R1 is connected with the emitter of PNP type triode, and the other end is connected with the base stage of PNP type triode; One end of resistance R2 is connected with the collector electrode of PNP type triode, and the other end is connected with the emitter of NPN type triode; The emitter of NPN type triode is connected with the energization pins GND of power supply chip; One end of electric capacity C1 is connected with the emitter of PNP type triode and resistance R3, and the other end is connected with the emitter of NPN type triode.
During power initiation, supply power voltage Vin is charged to electric capacity C1 by resistance R3, and when electric capacity C1 voltage is enough high, power supply chip is just started working.When overpressure situation occurs, overvoltage protection triggering signal can open latch cicuit, and electric capacity C1 is discharged over the ground by latch cicuit, and when electric capacity C1 voltage is lower than under-voltage of chip power supply, power supply chip quits work, interrupt output, completes protection.Resistance R3>>R1 & R2, determine the electric current flowing through latch cicuit when latch cicuit is opened, resistance R1 and resistance R2 then determines the size that latch cicuit opens the base emitter voltage of rear PNP type triode and NPN type triode.If resistance R1 and resistance R2 resistance larger; the voltage then flowing through resistance two ends during certain electric current is higher; higher than the conducting voltage of PNP type triode and NPN type triode; like this, after overvoltage protection triggering signal is cancelled, latch cicuit still can be held open; power supply keeps closed condition; now must interrupt Vin to power and re-start and power on, power supply could start again, and this is just for power supply provides the over-voltage protecting function of self-locking type.If resistance R1 and resistance R2 resistance less; so the voltage at its two ends will be not enough to the conducting maintaining PNP type triode and NPN type triode; after triggering signal disappears; latch cicuit will be closed; Vin charges to electric capacity C1 again; power supply will start again, and this overvoltage protection mechanism is autoboot type overvoltage protection.
Foregoing circuit, as long as the size regulating wherein resistance, just can carry out unrestricted choice to the protected mode of power supply overvoltage protection easily.
By embodiment above, described those skilled in the art can be easy to realize the present invention.But should be appreciated that the present invention is not limited to above-mentioned several embodiments.On the basis of disclosed execution mode, described those skilled in the art can the different technical characteristic of combination in any, thus realizes different technical schemes.
Claims (3)
1. the power supply overvoltage protection method based on triode latch cicuit, it is characterized in that, the latch cicuit that this power supply overvoltage protection method forms mainly through two triodes and two resistance, this latch cicuit is connected with the energization pins of power supply chip, chip power supply voltage is dragged down, powered-down when overvoltage fault occurs; Whether control the latch of latch cicuit by adjusting resistance resistance, determine that power supply is when overvoltage fault occurs, and is protect with self-locking type protected mode, or protects with autoboot pattern.
2. a kind of power supply overvoltage protection method based on triode latch cicuit according to claim 1, is characterized in that, two described triodes are respectively PNP type triode and NPN type triode.
3. a kind of power supply overvoltage protection method based on triode latch cicuit according to claim 1 and 2, it is characterized in that, the power supply overvoltage protection circuit of this described power supply overvoltage protection method specifically connects as follows:
The base stage of PNP type triode is connected with the collector electrode of NPN type triode, and the emitter of PNP type triode is connected with the energization pins VDD of power supply chip, and the collector electrode of PNP type triode is connected with the base stage of NPN type triode; One end of resistance R1 is connected with the emitter of PNP type triode, and the other end is connected with the base stage of PNP type triode; One end of resistance R2 is connected with the collector electrode of PNP type triode, and the other end is connected with the emitter of NPN type triode; The emitter of NPN type triode is connected with the energization pins GND of power supply chip; One end of electric capacity C1 is connected with the emitter of PNP type triode and resistance R3, and the other end is connected with the emitter of NPN type triode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510407106.8A CN105048404A (en) | 2015-07-13 | 2015-07-13 | Power supply overvoltage protection method based on triode latch circuit |
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| CN201510407106.8A CN105048404A (en) | 2015-07-13 | 2015-07-13 | Power supply overvoltage protection method based on triode latch circuit |
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| CN105048404A true CN105048404A (en) | 2015-11-11 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385249A (en) * | 2016-08-26 | 2017-02-08 | 王文杰 | PWM control signal self-locking protection circuit of electric automobile motor controller |
| CN106484022A (en) * | 2016-10-31 | 2017-03-08 | 广州视源电子科技股份有限公司 | Mainboard overvoltage protection method and system |
| CN106655130A (en) * | 2016-10-19 | 2017-05-10 | 成都尚智恒达科技有限公司 | Protective circuit for elevator calling panel |
| CN107054251A (en) * | 2016-12-20 | 2017-08-18 | 乐视汽车（北京）有限公司 | A kind of latch cicuit and vehicle control system |
| CN108399904A (en) * | 2018-04-27 | 2018-08-14 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal panel drive circuit |
| CN110518546A (en) * | 2019-09-19 | 2019-11-29 | 山东超越数控电子股份有限公司 | A kind of self-locking power supply overvoltage protection circuit and implementation method based on triode |
| CN111044573A (en) * | 2019-11-28 | 2020-04-21 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2039170A (en) * | 1979-01-05 | 1980-07-30 | Paris & Du Rhone | Overvoltage protection device |
| CN104701809A (en) * | 2015-03-30 | 2015-06-10 | 珠海绿金能控科技有限公司 | LED constant-voltage power supply with self-locking protecting circuit |
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2015
- 2015-07-13 CN CN201510407106.8A patent/CN105048404A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2039170A (en) * | 1979-01-05 | 1980-07-30 | Paris & Du Rhone | Overvoltage protection device |
| CN104701809A (en) * | 2015-03-30 | 2015-06-10 | 珠海绿金能控科技有限公司 | LED constant-voltage power supply with self-locking protecting circuit |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385249A (en) * | 2016-08-26 | 2017-02-08 | 王文杰 | PWM control signal self-locking protection circuit of electric automobile motor controller |
| CN106655130A (en) * | 2016-10-19 | 2017-05-10 | 成都尚智恒达科技有限公司 | Protective circuit for elevator calling panel |
| CN106655130B (en) * | 2016-10-19 | 2019-07-12 | 江苏伯爵电梯股份有限公司 | A kind of protection circuit for elevator call panel |
| CN106484022A (en) * | 2016-10-31 | 2017-03-08 | 广州视源电子科技股份有限公司 | Mainboard overvoltage protection method and system |
| CN107054251A (en) * | 2016-12-20 | 2017-08-18 | 乐视汽车（北京）有限公司 | A kind of latch cicuit and vehicle control system |
| CN107054251B (en) * | 2016-12-20 | 2023-06-30 | 法法汽车(中国)有限公司 | Latch circuit and vehicle control system |
| CN108399904A (en) * | 2018-04-27 | 2018-08-14 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal panel drive circuit |
| CN108399904B (en) * | 2018-04-27 | 2020-02-18 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal panel driving circuit |
| US11087704B2 (en) * | 2018-04-27 | 2021-08-10 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Liquid crystal panel driving circuit and liquid crystal panel |
| CN110518546A (en) * | 2019-09-19 | 2019-11-29 | 山东超越数控电子股份有限公司 | A kind of self-locking power supply overvoltage protection circuit and implementation method based on triode |
| CN111044573A (en) * | 2019-11-28 | 2020-04-21 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
| CN111044573B (en) * | 2019-11-28 | 2022-04-08 | 浙江大华技术股份有限公司 | Fault detection circuit and method for gas sensor |
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