【摘要】 负载谐振桥式逆变器中功率MOS管工作在软开关状态,开关频率的提高,要求门极驱动电路具有充电电流大、开关速度快、驱动损耗小的特点。文章通过对传统门极驱动电路和现存的谐振驱动电路分析比较后,提出了适合高频谐振逆变器中功率MOS管的谐振电流型驱动电路,并分析了其工作过程。理论分析与实验结果表明:此驱动电路中功率MOS管的充放电电流近似为恒流,减少了开关时间;电感电流不连续,降低了驱动电路的通态损耗;二极管钳位电路,为功率MOS管门极关断提供反压,进一步缩短了功率MOS管关断时间;电感存储能量回馈给供电电源,提高了驱动栅压,降低了功率MOS管的导通电阻等优点。更多还原

【Abstract】 Power MOSFET operations in softing switching in the load resonant bridge inverter,as the switching frequency is up to MHz,the gate driver is needed to meet the requirements of higer driver current,faster switching,lower speed,less driver loss.After the analysis and comparison to the conventional gate driver and the existing resonant one,the paper presents a new discontinuous current source gate driver for power MOSFET in the HF resonant bridge inverter,and the work processing of the new driver was addressed in detail.The principle analysis and experimental results verify that the values of charging and discharging of power MOSFET are almost constant,significant reduction of the switching transition time and switching loss.The inductance current is discontinuous,decrease the conduction loss;to use anti-diodes path to create a negative gate voltage during turn-off transition,further reduced switching time and the turn-off loss;the stored energy in the inductor is returned to the drive voltage source.The benefit of the gate energy recovery capability is that higher gate drive voltage can be used to further reduce the conduction loss.更多还原