Abstract: Regarding to the chaos stability control, the mechanism of stability control caused by ramp compensation in buck, boost, and buck-boost converters is studied. The corresponding discrete map models are built, and the circuit stability criterions and the slope expressions of compensating ramp are achieved. With their bifurcation diagram, Lyapunov exponent spectrum, and time-domain waveform, the performance of switching converter circuit by utilizing compensating ramp current (or voltage) are given. The research results indicate that the ramp compensation technique can effectively improve stability of switched DC-DC converter.