提出了一种恒流源功率开关管驱动电路。电路采用全桥结构，双电源供电，可实现主电路开关管正、负电压驱动；利用桥臂间电感电流短时间内不能突变，实现恒定电流输出；调节电感充放电时间，可提供不同等级的驱动电流，从而实现主开关管高效驱动；开关周期内电感电流断续，减少了驱动电路中开关管通态损耗。详细介绍了电路工作原理、开关逻辑实现以及电感设计，分析了驱动电路的自身损耗。在Boost电路上的测试表明，相比于传统的驱动电路，采用所述恒流源驱动电路，额定负载处效率可提升1%以上。%This study proposes a constant current source drive circuit with a full-bridge structure and dual power sources, which achieves the drive on-off with positive or negative voltage. The constant drive current is obtained by the inductance current at short circuit state. Regulating the charge and discharge time can obtain different level driving current, thus improving efficiency for power switches. The discontinued current of the inductance reduces the on-state losses of power transistors. The working principle, switching logic, and inductance's design as well as the power losses are then elaborated. The Boost circuit test shows that the circuit efficiency has increased by more than 1%with the proposed drive circuit compared to traditional drive circuit.
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