一种DCDC转换器中可灵活适配多种功率管的过流保护电路
By designing a current control circuit and a comparison and judgment circuit, and adjusting the bias current Ibias, the problem that the overcurrent protection circuit in the DC-DC converter cannot be adapted to different types of power transistors is solved, and precise protection for different types of power transistors is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA KEY SYST & INTEGRATED CIRCUIT
- Filing Date
- 2023-12-21
- Publication Date
- 2026-07-17
AI Technical Summary
The overcurrent protection circuits in existing DC-DC converters cannot flexibly adapt to different types of power transistors, resulting in insufficient protection performance.
By designing a current control circuit and a comparison and judgment circuit, and using the bias current Ibias for adjustment, power transistor switches with different internal resistances are matched. The circuit includes a first cascode current mirror, a feedback branch, a basic current mirror, a second cascode current mirror, an adjustment branch, and a bias circuit, thereby achieving precise current regulation.
It achieves flexible adaptation of overcurrent protection circuits in DC-DC converters, adapting to different types of power transistors, and improving the adaptability and accuracy of protection performance.
Smart Images
Figure CN117748418B_ABST