一种用于电流模控制的Buck电源变换器的过流保护电路
By using high-voltage MOSFET on-resistance sampling and optimizing current detection with a self-biasing circuit, the high power consumption and low accuracy problems of traditional overcurrent protection circuits are solved, achieving low-power, fast-response overcurrent protection, which is suitable for current-mode controlled Buck power converters.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHONGQING UNIV OF POSTS & TELECOMM
- Filing Date
- 2024-01-29
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional overcurrent protection circuits suffer from manufacturing errors when detecting inductor current, are greatly affected by power supply voltage and temperature, and have high power consumption, which cannot meet the high-speed and low-power requirements of modern electronic circuits.
Using the same high-voltage MOSFET on-resistance sampling method as the system-level power transistor, combined with a self-biasing circuit and a comparator circuit, power consumption is reduced and inductor current changes are responded to quickly. The detection accuracy is optimized by temperature-compensated resistor voltage divider and hysteresis structure. The low-power self-biasing circuit is designed to operate only when the lower power transistor is turned on.
It achieves low power consumption and fast response overcurrent protection under wide voltage and high frequency conditions, reduces process errors and temperature effects, and meets the high speed and low power consumption requirements of modern electronic circuits.
Smart Images
Figure CN117748420B_ABST