Two-stage resonance DC-DC converter capable of automatically switching multiple modes

The invention relates to a multi-mode automatic switching two-stage resonance DCDC converter. The convertercomprises a conversion circuit and a control circuit, wherein the control circuit comprises avoltage sampling module, a PWM module, a PFM/PSM module, a control logic module and a driving module. According to the converter, three control modes of PFM, PSM and PWM are organically combined, theworking mode of the two-stage resonance DCDC converter is controlled according to the input voltage, frequency conversion, phase shift and pulse width control are sequentially adopted for the input voltage from low to high, the control method is simple, and problems that in a single control mode, the switching frequency of the converter changes widely within a wide input voltage range, and the power consumption is high are solved; and efficiency of the converter is improved. 本发明涉及一种多模式自动切换的两级谐振DC-DC转换器，包括转换电路和控制电路，所述控制电路包括电压采样模块、PWM模块、PFM/PSM模块、控制逻辑模块和驱动模块。该转换器将PFM、PSM和PWM三种控制模式进行了有机结合，根据输入电压来控制两级谐振DC-DC转换器的工作模式，输入电压由