CN211089113U - Power supply overvoltage protection circuit - Google Patents
Power supply overvoltage protection circuit Download PDFInfo
- Publication number
- CN211089113U CN211089113U CN201921869129.0U CN201921869129U CN211089113U CN 211089113 U CN211089113 U CN 211089113U CN 201921869129 U CN201921869129 U CN 201921869129U CN 211089113 U CN211089113 U CN 211089113U
- Authority
- CN
- China
- Prior art keywords
- power supply
- control chip
- triode
- supply control
- 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
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000015556 catabolic process Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Landscapes
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
本实用新型公开了一种电源过压保护电路，包括稳压二极管、NPN型的三极管、电阻、电容和电源控制芯片；所述稳压二极管的阴极接电源电压，且所述稳压二极管的击穿电压大于所述电源电压的额定值；所述稳压二极管的阳极通过所述电阻连接至所述三极管的基极；所述三极管的发射极与基极分别连接所述电容的两端，且所述三极管的发射极接地；所述三极管的集电极连接至所述电源控制芯片的一个引脚，且所述电源电压连接至所述电源控制芯片的另一个引脚；所述电源控制芯片用于为外部电路供电，且所述电源控制芯片与所述三极管的集电极连接的引脚处的电压低于预设值时，所述电源控制芯片停止为外部电路供电。
The utility model discloses a power supply overvoltage protection circuit, which comprises a zener diode, an NPN type triode, a resistor, a capacitor and a power supply control chip; the cathode of the zener diode is connected to the power supply voltage; The breakdown voltage is greater than the rated value of the power supply voltage; the anode of the Zener diode is connected to the base of the triode through the resistor; the emitter and the base of the triode are respectively connected to both ends of the capacitor, and The emitter of the triode is grounded; the collector of the triode is connected to one pin of the power supply control chip, and the power supply voltage is connected to another pin of the power supply control chip; the power supply control chip uses When supplying power to an external circuit and the voltage at the pin connecting the power supply control chip and the collector of the triode is lower than a preset value, the power supply control chip stops supplying power to the external circuit.
Description
技术领域technical field
本实用新型涉及电源保护电路技术领域，具体涉及一种电源过压保护电路。The utility model relates to the technical field of power supply protection circuits, in particular to a power supply overvoltage protection circuit.
背景技术Background technique
电路中若发生故障，可能会造成电源输出的电压飙升，从而对电路结构造成严重损害。因此，设计电源过压保护电路是很有必要的。目前现有的电源过压保护电路存在稳定性差，适用性低，成本高等问题。If a fault occurs in the circuit, it may cause the voltage of the power supply output to surge, thereby causing serious damage to the circuit structure. Therefore, it is necessary to design a power supply overvoltage protection circuit. At present, the existing power supply overvoltage protection circuit has the problems of poor stability, low applicability and high cost.
实用新型内容Utility model content
为了解决上述技术问题，本实用新型的提供了一种电源过压保护电路，包括稳压二极管、NPN型的三极管、电阻、电容和电源控制芯片；In order to solve the above-mentioned technical problems, the utility model provides a power supply overvoltage protection circuit, which includes a zener diode, an NPN transistor, a resistor, a capacitor and a power supply control chip;
所述稳压二极管的阴极接电源电压，且所述稳压二极管的击穿电压大于所述电源电压的额定值；The cathode of the Zener diode is connected to the power supply voltage, and the breakdown voltage of the Zener diode is greater than the rated value of the power supply voltage;
所述稳压二极管的阳极通过所述电阻连接至所述三极管的基极；The anode of the Zener diode is connected to the base of the triode through the resistor;
所述三极管的发射极与基极分别连接所述电容的两端，且所述三极管的发射极接地；The emitter and base of the triode are respectively connected to two ends of the capacitor, and the emitter of the triode is grounded;
所述三极管的集电极连接至所述电源控制芯片的一个引脚，且所述电源电压连接至所述电源控制芯片的另一个引脚；The collector of the triode is connected to one pin of the power supply control chip, and the power supply voltage is connected to another pin of the power supply control chip;
所述电源控制芯片用于为外部电路供电，且所述电源控制芯片与所述三极管的集电极连接的引脚处的电压低于预设值时，所述电源控制芯片停止为外部电路供电。The power supply control chip is used to supply power to an external circuit, and when the voltage at the pin connecting the power supply control chip and the collector of the triode is lower than a preset value, the power supply control chip stops supplying power to the external circuit.
在一些实施例中，所述电源电压的额定值为12V。In some embodiments, the supply voltage is rated at 12V.
在一些实施例中，所述电源控制芯片为UC3843B芯片。In some embodiments, the power control chip is a UC3843B chip.
与现有技术相比，本实用新型的优点是：本实用新型提供的电源过压保护电路，当电源电压正常时，稳压二极管不导通，三极管也不导通，电源控制芯片正常工作，为外部电路供电；当电源电压过高时，稳压二极管被击穿，使三极管导通，因三极管的发射机接地，造成电源控制芯片与三极管连接的引脚电压下降，从而使电源控制芯片停止为外部电路供电，实现了过压保护。该电源过压保护电路稳定性高、适用性强，且制造成本低。Compared with the prior art, the advantages of the present utility model are: the power supply overvoltage protection circuit provided by the present utility model, when the power supply voltage is normal, the zener diode is not conducting, the triode is not conducting, and the power supply control chip works normally, Power supply for external circuits; when the power supply voltage is too high, the Zener diode is broken down, making the triode turn on. Because the transmitter of the triode is grounded, the voltage of the pin connecting the power control chip and the triode drops, so that the power control chip stops. Provides power for external circuits and realizes overvoltage protection. The power supply overvoltage protection circuit has high stability, strong applicability and low manufacturing cost.
附图说明Description of drawings
通过下文中参照附图对本实用新型所作的描述，本实用新型的其它目的和优点将显而易见，并可帮助对本实用新型有全面的理解。Other objects and advantages of the present invention will be apparent from the following description of the present invention with reference to the accompanying drawings, and may help a comprehensive understanding of the present invention.
图1为本实用新型提供的电源过压保护电路的原理示意图。FIG. 1 is a schematic diagram of the principle of a power supply overvoltage protection circuit provided by the present invention.
具体实施方式Detailed ways
为使本实用新型的目的、技术方案和优点更加清楚，下面将对本实用新型的技术方案进行清楚、完整地描述。显然，所描述的实施例是本实用新型的一部分实施例，而不是全部的实施例。基于所描述的本实用新型的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本实用新型保护的范围。In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be described clearly and completely below. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
除非另外定义，本实用新型使用的技术术语或者科学术语应当为本实用新型所属领域内具有一般技能的人士所理解的通常意义。Unless otherwise defined, technical or scientific terms used in the present invention shall have the ordinary meanings understood by those with ordinary skill in the art to which the present invention belongs.
参照图1，为本实用新型提供的一种电源过压保护电路，包括稳压二极管D、NPN型三极管Q、电阻R、电容C和电源控制芯片U。具体地，稳压二极管D的阴极接电源电压V，且稳压二极管D的击穿电压大于电源电压的额定值；稳压二极管D的阳极通过电阻R连接至三极管Q的基极；三极管Q的发射极与基极分别连接电容C的两端，且三极管Q的发射极接地；三极管Q的集电极连接至电源控制芯片U的一个引脚，且电源电压连接至电源控制芯片U的另一个引脚；电源控制芯片U用于为外部电路供电，且电源控制芯片U与三极管Q的集电极连接的引脚处的电压低于预设值时，电源控制芯片U停止为外部电路供电。Referring to FIG. 1 , a power supply overvoltage protection circuit provided by the utility model includes a zener diode D, an NPN transistor Q, a resistor R, a capacitor C and a power supply control chip U. Specifically, the cathode of the Zener diode D is connected to the power supply voltage V, and the breakdown voltage of the Zener diode D is greater than the rated value of the power supply voltage; the anode of the Zener diode D is connected to the base of the transistor Q through the resistor R; The emitter and the base are respectively connected to the two ends of the capacitor C, and the emitter of the transistor Q is grounded; the collector of the transistor Q is connected to a pin of the power control chip U, and the power supply voltage is connected to another lead of the power control chip U. pin; the power supply control chip U is used to supply power to the external circuit, and when the voltage at the pin where the power supply control chip U is connected to the collector of the transistor Q is lower than the preset value, the power supply control chip U stops supplying power to the external circuit.
具体地，电源电压的额定值例如可以为12V；二极管D的击穿电压例如可以为15V；电容C为滤波电容；电源控制芯片可采用UC3843B芯片。Specifically, the rated value of the power supply voltage can be, for example, 12V; the breakdown voltage of the diode D can be, for example, 15V; the capacitor C is a filter capacitor; and the power control chip can be a UC3843B chip.
本实用新型提供的电源过压保护电路，当电源电压正常时，稳压二极管D不导通，三极管Q也不导通，此时电源控制芯片U正常工作，为外部电路供电；当电源电压过高时，稳压二极管D被击穿，使三极管Q导通，因三极管Q的发射极接地，造成电源控制芯片U与三极管Q的发射极连接的引脚电压下降，从而使电源控制芯片U停止为外部电路供电，实现了过压保护。该电源过压保护电路稳定性高、适用性强，且制造成本低。In the power supply overvoltage protection circuit provided by the utility model, when the power supply voltage is normal, the zener diode D is not conducting, and the transistor Q is also not conducting. At this time, the power supply control chip U works normally and supplies power to the external circuit; When it is high, the Zener diode D is broken down, so that the transistor Q is turned on. Because the emitter of the transistor Q is grounded, the voltage of the pin connecting the power control chip U and the emitter of the transistor Q drops, so that the power control chip U stops. Provides power for external circuits and realizes overvoltage protection. The power supply overvoltage protection circuit has high stability, strong applicability and low manufacturing cost.
以上所述的具体实施例，对本实用新型的目的、技术方案和有益效果进行了进一步详细说明，应理解的是，以上所述仅为本实用新型的具体实施例而已，并不用于限制本实用新型，凡在本实用新型的精神和原则之内，所做的任何修改、等同替换、改进等，均应包括在本实用新型的保护范围之内。The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921869129.0U CN211089113U (en) | 2019-11-01 | 2019-11-01 | Power supply overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921869129.0U CN211089113U (en) | 2019-11-01 | 2019-11-01 | Power supply overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211089113U true CN211089113U (en) | 2020-07-24 |
Family
ID=71623546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921869129.0U Expired - Fee Related CN211089113U (en) | 2019-11-01 | 2019-11-01 | Power supply overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211089113U (en) |
-
2019
- 2019-11-01 CN CN201921869129.0U patent/CN211089113U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020191618A1 (en) | Anti-backflow circuit, power supply and anti-backflow method | |
| CN204515579U (en) | A kind of overvoltage crowbar | |
| CN204424894U (en) | A kind of DC power supply input protection circuit | |
| CN211089113U (en) | Power supply overvoltage protection circuit | |
| CN104052267B (en) | Multi-voltage transformation circuit | |
| CN216699484U (en) | Overvoltage protection circuit and device | |
| CN204376717U (en) | Dummy load control circuit and inverse-excitation type switch power-supply circuit | |
| CN210380222U (en) | Anti-oscillation overvoltage protection circuit | |
| CN205726196U (en) | A kind of terrestrial broadcasting Set Top Box TUNER power supply circuits | |
| CN102368813A (en) | Voltage-stabilizing circuit | |
| CN206640308U (en) | A vehicle power supply protection circuit | |
| CN103683215A (en) | Short-circuit protection circuit of electronic switch | |
| CN207884494U (en) | A kind of positive-negative power generation circuit suitable for IGBT drivings | |
| CN209150713U (en) | A kind of signal output apparatus and device | |
| CN219086799U (en) | Transient surge voltage suppression circuit and power supply system | |
| CN205862296U (en) | A single-chip microcomputer under-voltage reset circuit | |
| CN218897166U (en) | DC power supply surge protection circuit | |
| CN221009806U (en) | Protection circuit for preventing high-voltage power input | |
| CN221929318U (en) | Circuit for realizing short circuit and overcurrent protection of discrete device | |
| CN204464939U (en) | An electronic self-recovery insurance circuit | |
| CN205356289U (en) | Time delay automatic shutdown security circuit | |
| CN204794034U (en) | Input undervoltage protection circuit | |
| CN217240326U (en) | Anti-reverse wiring, electronic equipment and vehicles | |
| CN210578471U (en) | Overvoltage protection circuit | |
| CN204558367U (en) | A kind ofly drive stable control relay circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200724 Termination date: 20211101 |