Patent ID: 7006364
Filing Date: 2006-02-28
Classification: H02M,Y02B

Abstract:
1. A driving circuit for a switch-bridge of a DC-DC converter, said switch-bridge comprising a main switch connected in series with an active switch operating in complementary to said main switch, comprising: an input terminal receiving an input of a PWM signal; a first output terminal connected to said main switch for outputting a low-side driving signal; a second output terminal connected to said active switch for outputting a high-side driving signal; a first branch having a voltage level shifting capacitor and a first buffer connected in series between said input terminal and said second output terminal; and a second branch having a delay circuit and a second buffer connected in series between said input terminal and said first output terminal; wherein when said input of said PWM signal drops from a high level to a low level, said input of PWM signal is transmitted to said second buffer through said delay circuit for turning off said main switch and then triggering said first buffer to turn on said active switch, and when said input of PWM signal turns from said low level to said high level, said voltage level shifting capacitor transmits said input of PWM signal to said first buffer for turning off said active switch and then triggering said second buffer to turn on said main switch with a short time delay.