可逆三相桥式整流电路输出电流换向过零检测系统及方法
By constructing a bridge arm voltage sampling circuit and control system in a reversible three-phase bridge rectifier circuit, and combining it with an FPGA and a main controller, a fast and reliable zero-current detection judgment is achieved. This solves the problems of low sensitivity and complex hardware circuits in existing zero-current detection technologies, and reduces the failure rate and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN RES INST OF ELECTRIC SCI
- Filing Date
- 2022-12-27
- Publication Date
- 2026-07-17
AI Technical Summary
In existing technologies, zero-current detection circuits have low sensitivity in AC-AC frequency conversion systems, complex hardware circuit implementation, and high failure rate, making it difficult to meet control requirements.
A reversible three-phase bridge rectifier circuit output current commutation zero-crossing detection system is adopted, including a bridge arm voltage sampling circuit and a control system. The system uses an FPGA and a main controller for zero current detection. Through bridge arm voltage detection, bridge arm trigger pulse detection and zero current comprehensive logic judgment, the system can quickly and accurately judge the zero current signal.
This reduces the zero-current detection time to 2ms, lowers the probability of failure, saves hardware circuit costs, and improves the reliability and stability of the system.
Smart Images
Figure CN116165425B_ABST