Adaptive modulation mode switching circuit applied to high-efficiency DC-DC converter

The invention requests to protect an adaptive mode switching circuit applied to a high-efficiency DC-DC converter. The circuit mainly comprises a triangular wave generation circuit, a shielding signalgeneration circuit and a pulse width modulation circuit. And the pulse width modulation loop and the shielding signal generation circuit realize adaptive modulation mode switching. The triangular wave generation circuit is used for generating a frequency fixed triangular wave signal VRAMP and a pulse signal VCLK, wherein the VRAMP and a reference voltage VI pass through a comparator COMP1 to generate a clock signal with the same period as a PWM control square wave, and the clock signal and the VCLK pass through an RS trigger to form a pulse signal VCLK1 having the same clock rising edge withthe PWM signal. When the load is heavy, the output signal QDRIVE is the modulation signal PWM of the original control loop, and when the load is light, the shielding signal VSKIP logic becomes '1'after passing through the D tr