自适应可调延时控制的双耦合电感软开关零电压转换逆变器

Two Coupled Inductor Soft-Switching Zero Voltage Transition Inverter Controlled by Adaptive Variable Timing

提出了一种基于电压过零检测电路的可调延时控制方法,应用到新型双耦合电感软开关ZVT逆变器中,实现了零电压开关的自适应控制。通过实时检测主开关的电压过零点,自适应地调节辅助开关与主开关之间的延时时间,使主开关零电压开通恰好发生在器件电压降至零的时刻。与固定延时时间方法相比,该法确保当负载由轻载到额定变化时都能实现零电压软开关,使逆变器高效运行。零电压检测、开关控制逻辑与驱动电路一起完全通过硬件实现,无需DSP干预,控制软件移植性好。仿真和实验结果相符合,证明了本文所提方法的有效性和实用性。

A variable timing control method based on voltage zero crossing detection is proposed in this paper, and is applied to the new type two coupled inductor soft-switching zero voltage transition(ZVT) inverter to realize the adaptive control of zero-voltage switching. Through real-time voltage zero crossing detection of the main switch, the delay time between auxiliary switch and main switch can be adjusted adaptively, and then the main switch turns on right after voltage drops to zero. Compared with the fixed timing control method, zero-voltage soft-switching can always be realized by the proposed method, and high-efficient operation of the inverter also can be ensured when its load changes from light to heavy. Instead of DSP software control, zero voltage detection, switches control logic, together with the gate driving circuit, can be designed and built totally by hardware, and therefore the control software is of better portability. Feasibility and effectiveness of the proposed method in this paper are verified by simulation and experimental results.