CN202651746U - Power supply over-voltage protection circuit - Google Patents
Power supply over-voltage protection circuit Download PDFInfo
- Publication number
- CN202651746U CN202651746U CN 201220229551 CN201220229551U CN202651746U CN 202651746 U CN202651746 U CN 202651746U CN 201220229551 CN201220229551 CN 201220229551 CN 201220229551 U CN201220229551 U CN 201220229551U CN 202651746 U CN202651746 U CN 202651746U
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supply
- low
- protection circuit
- loop
- 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 - Lifetime
Links
- 230000008878 coupling Effects 0.000 claims description 18
- 238000010168 coupling process Methods 0.000 claims description 18
- 238000005859 coupling reaction Methods 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 230000008034 disappearance Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001077 hypotensive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Abstract
The utility model provides a power supply over-voltage protection circuit with a self-recovery function, having the advantages of having few components, being low in cost and having high-low voltage isolation. The power supply over-voltage protection circuit comprises a high-voltage loop, a low-voltage loop, a photo coupled isolator and an audion, wherein the high-voltage loop is connected with a power supply input voltage; the low-voltage loop is connected with a control chip for components inside the power supply; the high-voltage is successively connected with a voltage-regulator diode, resistances, a base-collector electrode of the audion and an light-emitting diode of the photo coupled isolator in series; a base-emitting electrode of the audion is connected with the ground of the high-voltage loop through the resistances; and the low-voltage loop is connected with the control chip end for components inside the power supply, the photoreceptive end of the photo coupled isolator, and the ground of the low-voltage loop in series. For the power supply over-voltage protection circuit, the photo coupled isolator is used for low-high voltage separation, and the audion automatically controls breakover of the low-voltage loop when the over voltage fault occurs, thus realizing a function for reducing the voltage; and the control chip starts the over voltage protection function according to the reduction of the voltage of the port; and when the over voltage fault disappears, the voltage of the control chip end is restored to the original set value, thus realizing the self-restore function.
Description
Technical field
The utility model relates to automobile mounted power technique fields, a kind of power supply over-voltage protection circuit of specific design.
Background technology
At present, along with the development of new-energy automobile industry, the application of vehicle power is more and more extensive, and its status and importance highlight day by day, and then also there is more and stricter requirement itself performance, reliability and fail safe aspect of vehicle power.Vehicle power is because its importance to car load, and the protection of overvoltage fault is also had high request.
Summary of the invention
The purpose of this utility model is that a kind of components and parts of proposition are few, and cost is low, and high-low pressure is isolated, and has the power supply over-voltage protection circuit of self-recovering function.
According to the power supply over-voltage protection circuit that the utility model proposes, key is to comprise the high tension loop that is connected with power input voltage, low tension loop, optical coupling isolator and the triode that is connected with power supply internal component control chip, described high tension loop is connected by the base stage-collector electrode of voltage stabilizing didoe, resistance, triode and the light-emitting diode of optical coupling isolator successively, and the base-emitter of described triode connects the ground of high tension loop by resistance; Described low tension loop is by the ground series connection of power supply internal component control chip end, optical coupling isolator light-receiving end and low tension loop.
The utility model utilizes optical coupling isolator to do the high-low pressure separation; and high tension loop uses triode as switching tube; triode is according to the light-emitting diode conducting of change in voltage automatic control light coupling isolator when the overvoltage fault occurs; the simultaneously conducting of optical coupling isolator light-receiving end this moment; thereby make the power supply internal component control chip end of low tension loop and the ground conducting of low tension loop; realize hypotensive effect, control chip starts over-voltage protection function according to the lower voltage of this port.After having served as the voltage failure disappearance, during namely switching tube shutoff of triode, the control chip terminal voltage is returned to the original start value, thereby has realized the self-recovering function after the overvoltage trouble shooting.
Further, described triode is large power triode, uses in the high tension loop being suitable for.
Further, described triode is a kind of among DA87,3DAl51,3DAl52,3DA88,3DAg3,3DA30,3DAl4,3DA41,3DAl, 3DA2, the 3DA3.
Further, described optical coupling isolator is the linear optical coupling isolator, plays better high-low pressure isolation effect.
Description of drawings
Fig. 1 is circuit structure diagram of the present utility model.
Embodiment
The below contrasts accompanying drawing, by the description to embodiment, the effect of the mutual alignment between the shape of embodiment of the present utility model such as related each member, structure, the each several part and annexation, each several part and operation principle etc. are described in further detail.
Power supply over-voltage protection circuit of the present utility model comprises the high tension loop that is connected with power input voltage, the low tension loop, optical coupling isolator and the triode that are connected with power supply internal component control chip, high tension loop is connected by the base stage-collector electrode of voltage stabilizing didoe, resistance, triode and the light-emitting diode of optical coupling isolator successively, and the base-emitter of triode connects the ground of high tension loop by resistance; Low tension loop is by the ground series connection of power supply internal component control chip end, optical coupling isolator light-receiving end and low tension loop.
Such as Fig. 1, Uin is power input voltage among the figure, is 45V-200V in the utility model example, but is not limited to this voltage range in the practical application, and the loop is called high tension loop.The power module internal component current supply circuit that the utility model example will be connected with power supply internal component control chip is called low tension loop, such as 12V, 5V system etc.D1 is voltage stabilizing didoe, and U1 is optical coupling isolator, and Q1 is triode.Input voltage Uin connects 5 pin of D1 and 1 pin of U1,6 pin of D1 are connected to 7 pin of Q1 by resistance, and 2 pin of U1 connect 8 pin of Q1 by resistance, and 3 pin of U1 connect control chip, 4 pin of U1 connect the ground of low tension loop, and 9 pin of Q1 are connected to the ground of high tension loop by resistance.
Operation principle of the present utility model is: when having served as voltage failure and not occuring, the Q1 cut-off does not have electric current to flow through U1 between 1 pin of U1 and 2 pin and does not work, 3 pin of U1 and the cut-off of 4 pin, this moment, 3 pin level were identical with control chip end level, and general control die terminals original levels is set to high level.When having served as the voltage failure generation, Q1 conducting, 1 pin of U1 and 2 pin conductings; U1 work, at this moment 3 pin and the 4 pin conductings of U1,3 pin that are about to U1 link to each other with low tension loop ground; thereby realize the control chip terminal voltage is dragged down, control chip starts over-voltage protection function according to the conversion of this high-low level.Thereby well solved the high-low pressure isolating problem by the transmission that realizes the overvoltage fault message with the U1 optical coupling isolator.After having served as the voltage failure disappearance, Q1 reenters cut-off state, and U1 quits work, 3 pin of U1 and the cut-off of 4 pin, and the control chip terminal voltage is returned to the original start value, thereby has realized the self-recovering function after the overvoltage trouble shooting.
Claims (4)
1. power supply over-voltage protection circuit, it is characterized in that comprising the high tension loop that is connected with power input voltage, low tension loop, optical coupling isolator and the triode that is connected with power supply internal component control chip, described high tension loop is connected by the base stage-collector electrode of voltage stabilizing didoe, resistance, triode and the light-emitting diode of optical coupling isolator successively, and the base-emitter of described triode connects the ground of high tension loop by resistance; Described low tension loop is by the ground series connection of power supply internal component control chip end, optical coupling isolator light-receiving end and low tension loop.
2. power supply over-voltage protection circuit according to claim 1 is characterized in that described triode is large power triode.
3. power supply over-voltage protection circuit according to claim 1 is characterized in that described triode is a kind of among DA87,3DAl51,3DAl52,3DA88,3DAg3,3DA30,3DAl4,3DA41,3DAl, 3DA2, the 3DA3.
4. according to claim 1 and 2 or 3 described power supply over-voltage protection circuit, it is characterized in that described optical coupling isolator is the linear optical coupling isolator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229551 CN202651746U (en) | 2012-05-22 | 2012-05-22 | Power supply over-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220229551 CN202651746U (en) | 2012-05-22 | 2012-05-22 | Power supply over-voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202651746U true CN202651746U (en) | 2013-01-02 |
Family
ID=47420791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220229551 Expired - Lifetime CN202651746U (en) | 2012-05-22 | 2012-05-22 | Power supply over-voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202651746U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103446697A (en) * | 2013-07-23 | 2013-12-18 | 闽南师范大学 | Linkage fault detection device for point type fire detector |
| CN104466897A (en) * | 2013-09-23 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and lamp |
-
2012
- 2012-05-22 CN CN 201220229551 patent/CN202651746U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103446697A (en) * | 2013-07-23 | 2013-12-18 | 闽南师范大学 | Linkage fault detection device for point type fire detector |
| CN103446697B (en) * | 2013-07-23 | 2015-09-30 | 闽南师范大学 | A kind of linkage fault detection device for point type fire detector |
| CN104466897A (en) * | 2013-09-23 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and lamp |
| CN104466897B (en) * | 2013-09-23 | 2018-10-26 | 深圳市海洋王照明工程有限公司 | A kind of overvoltage crowbar and lamps and lanterns |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104753044A (en) | Topological structure of hybrid all-solid state high-voltage DC breaker | |
| CN103024973B (en) | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof | |
| CN202651746U (en) | Power supply over-voltage protection circuit | |
| CN203553913U (en) | Main controller overvoltage protection circuit and large-screen splicing system | |
| CN102148500A (en) | Unique lightning protection circuit of LED (light-emitting diode) power supply | |
| CN204068198U (en) | A kind of over under-voltage protection circuit of automatic support different electrical power system | |
| CN204215965U (en) | A kind of drive circuit of magnetic latching relay | |
| CN203859489U (en) | Current limiting protection circuit | |
| CN103412505B (en) | Remote switch controls and observation circuit | |
| CN205160489U (en) | Contactless electronic relay's safety protection circuit | |
| CN104242233A (en) | Overvoltage-undervoltage protecting circuit automatically supporting different power systems | |
| CN203535635U (en) | RS232 communication circuit | |
| CN202889312U (en) | Low power consumption low-voltage control relay with optical isolator | |
| CN202172398U (en) | Output circuit of two-wire system 4-20mA current loop | |
| CN201594506U (en) | Relay socket with built-in circuit | |
| CN204794065U (en) | Electric leakage circuit breaker thunderbolt surge protection circuit | |
| CN202487497U (en) | Isolation drive circuit of direct current contactor | |
| CN106997220B (en) | Delayed power circuit | |
| CN204347106U (en) | A kind of voltage sample buffer circuit | |
| CN202817719U (en) | Multifunctional power supply protection circuit | |
| CN204314464U (en) | Peculiar to vessel, Vehicular comprehensive Beidou satellite navigation Integrated Receiver | |
| CN103441656A (en) | IGBT driving circuit with undersaturated protection function | |
| CN103856171A (en) | Single proportion plug-type amplifier | |
| CN203983945U (en) | A kind of overvoltage protective system of automobile wire harness referral machine | |
| CN203761362U (en) | Bidirectional interface circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SAIC CHERY AUTOMOBILE CO., LTD. Effective date: 20150716 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150716 Address after: 241000 Yijiang, Anhui Province, Jin Hua Road, No. 226, South Road, No. Patentee after: New-energy automobile Technology Co., Ltd. of Cherry Address before: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Patentee before: Saic Chery Automobile Co., Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Patentee after: Chery New Energy Automobile Co.,Ltd. Address before: 241000 No. 226 Hua Jin South Road, Yijiang District, Anhui, Wuhu Patentee before: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130102 |