Search

CN-224233330-U - Power supply short-circuit protection circuit and electronic equipment

CN224233330UCN 224233330 UCN224233330 UCN 224233330UCN-224233330-U

Abstract

The utility model discloses a power supply short-circuit protection circuit and electronic equipment, which comprise a first field effect tube unit, a second field effect tube unit and a unidirectional conduction unit, wherein the input end of the first field effect tube unit is used for being connected with an input power supply, the output end of the first field effect tube unit is used for being connected with a load, the polarity of the second field effect tube unit is different from that of the first field effect tube unit, the input end of the second field effect tube unit is connected with the control end of the first field effect tube unit, the output end of the second field effect tube unit is connected with a reference voltage end, the control end of the second field effect tube unit is connected with the output end of the first field effect tube unit, the input end of the unidirectional conduction unit is connected with a capacitive unit, the output end of the unidirectional conduction unit is connected with the reference voltage end through the capacitive unit, and the input end and the output end of the unidirectional conduction unit are also connected with the input power supply. The circuit has a simple structure and can realize short-circuit protection and self-recovery.

Inventors

  • Xiong Jiedong
  • CHEN CHAOQIANG
  • CHANG XIANYUN
  • ZHANG XIN
  • WEI XIANGZHEN
  • JIANG JIAHUI

Assignees

  • 珠海欧森斯传感技术有限公司

Dates

Publication Date
20260512
Application Date
20250428

Claims (10)

  1. 1. A power supply short-circuit protection circuit, comprising: The first field effect transistor unit (100) is provided with an input end and an output end, wherein the input end of the first field effect transistor unit (100) is used for being connected with an input power supply, and the output end of the first field effect transistor unit (100) is used for being connected with a load; The polarity of the second field effect transistor unit (200) is different from that of the first field effect transistor unit (100), the input end of the second field effect transistor unit (200) is connected with the control end of the first field effect transistor unit (100), the output end of the second field effect transistor unit (200) is connected with the reference voltage end, and the control end of the second field effect transistor unit (200) is connected with the output end of the first field effect transistor unit (100); The unidirectional conduction unit (300) is connected with the control end of the first field effect tube unit (100) at the input end, the output end of the unidirectional conduction unit (300) is connected with the capacitive unit (400), and is connected with the reference voltage end through the capacitive unit (400), and the input end and the output end of the unidirectional conduction unit (300) are both connected with the input power supply.
  2. 2. The power supply short-circuit protection circuit according to claim 1, wherein the first fet unit (100) employs a P-type fet.
  3. 3. The power supply short-circuit protection circuit according to claim 1 or 2, characterized in that the second fet unit (200) employs an N-type fet.
  4. 4. A power supply short-circuit protection circuit according to claim 3, characterized in that the control end of the second fet unit (200) is connected to a first current limiting resistor and is connected to the output end of the first fet unit (100) through the first current limiting resistor.
  5. 5. The power supply short-circuit protection circuit according to claim 1, wherein the unidirectional conduction unit (300) employs a diode.
  6. 6. The power supply short-circuit protection circuit according to claim 5, wherein the input end of the unidirectional conduction unit (300) is connected to a first current limiting resistor, and is connected to the input power supply through the first current limiting resistor.
  7. 7. The power supply short-circuit protection circuit according to claim 1, 5 or 6, wherein the output end of the unidirectional conduction unit (300) is connected to a second current limiting resistor, and is connected to the input power supply through the second current limiting resistor.
  8. 8. The power supply short-circuit protection circuit according to claim 1, characterized in that the capacitive unit (400) employs a single capacitor or a group of capacitors.
  9. 9. The power supply short-circuit protection circuit according to claim 1, wherein the output end of the first field effect transistor unit (100) is connected with a capacitance filter unit.
  10. 10. An electronic device comprising a power supply short-circuit protection circuit as claimed in any one of claims 1 to 9.

Description

Power supply short-circuit protection circuit and electronic equipment Technical Field The present utility model relates to the field of power protection technologies, and in particular, to a power short-circuit protection circuit and an electronic device. Background With the development of the technology level, people pay more attention to safe production, and many industries begin to adopt sensors to monitor product conditions, such as natural gas meters, dangerous gas monitoring and the like, so that abnormal conditions of the sensors cannot cause product abnormality, and therefore production safety is guaranteed. Short-circuit protection in sensor devices is an important function for preventing damage to the device, fire or other dangerous situations caused by short-circuits in the electrical circuit. Common power protection measures include fuse and efuse, and the fuse has a relatively simple working principle, and when the current exceeds the rated value, the fuse is fused to cut off the circuit, but the fuse has slower fusing response time, one-time use and poor maintainability. The efuse is more complex in principle than the fuse, has more powerful functions, and is mainly characterized by quick response, resettable, programmable, and providing OCP/OVP protection, but has relatively high cost, and because of resettable reasons, after short-circuit protection occurs, the efuse can disconnect a current path, and after the current is reduced to a programmed value, the efuse can reopen the current path, so that the efuse is in the cycle of short circuit and disconnection, and the damage to a battery and a rear-stage circuit is huge. Disclosure of utility model The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the power supply short-circuit protection circuit and the electronic equipment, which have simple circuit structure and can realize short-circuit protection and self-recovery. In one aspect, an embodiment of the present utility model provides a power supply short-circuit protection circuit, including: The first field effect transistor unit is provided with an input end and an output end, wherein the input end of the first field effect transistor unit is used for being connected with an input power supply, and the output end of the first field effect transistor unit is used for being connected with a load; The polarity of the second field effect tube unit is different from that of the first field effect tube unit, the input end of the second field effect tube unit is connected with the control end of the first field effect tube unit, the output end of the second field effect tube unit is connected with the reference voltage end, and the control end of the second field effect tube unit is connected with the output end of the first field effect tube unit; The input end of the unidirectional conduction unit is connected with the control end of the first field effect tube unit, the output end of the unidirectional conduction unit is connected with the capacitive unit and is connected with the reference voltage end through the capacitive unit, and the input end and the output end of the unidirectional conduction unit are both connected with the input power supply. According to some embodiments of the utility model, the first fet unit employs a P-type fet. According to some embodiments of the utility model, the second fet unit is an N-type fet. According to some embodiments of the utility model, the control end of the second fet unit is connected to a first current limiting resistor, and is connected to the output end of the first fet unit through the first current limiting resistor. According to some embodiments of the utility model, the unidirectional conducting unit employs a diode. According to some embodiments of the utility model, an input end of the unidirectional conduction unit is connected with a first current limiting resistor, and is connected with the input power supply through the first current limiting resistor. According to some embodiments of the utility model, the output end of the unidirectional conduction unit is connected with a second current limiting resistor, and is connected with the input power supply through the second current limiting resistor. According to some embodiments of the utility model, the capacitive unit employs a single capacitor or a group of capacitors. According to some embodiments of the utility model, an output end of the first fet unit is connected to a capacitive filter unit. On the other hand, the embodiment of the utility model provides electronic equipment, which is characterized by comprising the power supply short-circuit protection circuit. The embodiment of the utility model has at least the following beneficial effects: Under the stable working state, the first field effect tube unit and the second field effect tube unit are conducted and form an interlocking