In many kinds of practial electrical circuits,the jittering of the mechanical switch often makes a mistaken triggering, leading to the malfunction of the circuit.

The mechanical switch avoiding flutter circuit adopts the trigger circuit,it does not affect the switch state during the fluttering,making it stable,so that the process of switching jitter has no effect on the state.

Chaotic signals generated from"Chua s circuit"is reformed and used to modulate the switching of Buck dc/dc converter operating in random switching mode based on chaos controlling.