Resonant conversion device with extended holding time and operation method thereof

The invention discloses a resonance conversion device with prolonged holding time and an operation method thereof. The resonance conversion device comprises a resonance conversion unit, a time delay unit and a control unit. The resonance conversion unit comprises a primary side, a voltage transformation unit and a secondary side, and the time delay unit comprises a coil and a bridge arm group. Andwhen the switching frequency of the primary side is smaller than the critical frequency, the control unit controls the bridge arm group to be switched on or off, so that the output voltage of the resonant conversion device is higher than the preset voltage within the maintaining time. 本发明公开了一种具有延长维持时间的谐振转换装置及其操作方法，谐振转换装置包括：谐振转换单元、延时单元及控制单元。谐振转换单元包括初级侧、变压单元及次级侧，且延时单元包括线圈与桥臂组。当初级侧的切换频率小于临界频率时，控制单元控制桥臂组切换导通或不导通，使谐振转换装置的输出电压在维持时间内高于预定电压。