基于电流信号的桥式无源逆变电路中互锁保护电路的设计

Design of Interlock Protection Circuits in Bridge Type Passive Inverter Circuit Which Basic on Current Signal

介绍了全桥逆变电路的工作方式。讨论分析了绝缘栅双极晶体管IGBT(Insulated-Gate Bipolar Transistor)在实际无源逆变电路中可能存在的直通现象,提出了除用软件实现死区和延时之外的解决方法。通过电流传感器和组合逻辑电路实现桥臂上IGBT的互锁功能,在硬件上实现防直通的策略。给出了详细的电路,对正常工作和短路故障时的原理进行了分析。该设计弥补了软件方法的不稳定性,提高了电路的可靠性和安全性。

The working mode of full bridge inverter circuit is introduced. After discussing the disadvantage of short-through of IGBT （ Insulated-Gate Bipolar Transistor） in actual passive inverter circuit, beside the solution of dead-zone and delay in hardware, a new methord was offered. It totally realized the founction of interlock by current sensor and logic circuits, to achieve the method of anti-short-through. Detailed circuit, analysis of normal operation and short trouble are given. The design compensats for the instability of software methods to great improved circuit reliability and security.