Protection circuit, circuit board and electronic equipment thereof
By designing a protection circuit including a sampling and comparison unit and a field effect tube, the problem of damage to the USB interface under a high-voltage power supply is solved, and high-voltage protection of the USB interface is realized to ensure the safe operation of the circuit.
CN222301409UActive Publication Date: 2025-01-03广东金莱特智能科技有限公司
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Patent Information
- Application Number
- CN202420903515.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-28
AI Technical Summary
Technical Problem
The existing USB interface is prone to damage when connected to a high-voltage power supply, and lacks effective high-voltage protection measures.
Method used
A protection circuit is designed, including an internal power supply module, a sampling and comparison unit, a first switching module and a second switching module. Using devices such as field effect tubes and sampling diodes, the first switching module is turned on when the input voltage is too high. 第二开关模块的场效应管截止断开,防止高压电压供电,实现保护。
Benefits of technology
It effectively avoids damage to the USB interface caused by high-voltage power supply, ensuring the safe operation of the circuit under high-voltage conditions.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN222301409U_ABST
Abstract
The embodiment of the utility model provides a novel protection circuit, a circuit board and an electronic device thereof, the novel protection circuit comprises an internal power supply module, a first switch module and a second switch module, the first switch module comprises a sampling comparison unit and a first switch, the second switch module comprises a field effect transistor, and the first switch module is combined with the second switch module. The sampling comparison unit of the first switch module samples the input voltage in real time, and when the input voltage is too large, the first switch is switched on, so that the field effect transistor of the second switch module is cut off, the input voltage cannot supply power to the subsequent load, and the circuit protection effect is achieved.
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