| 摘要 |
PROBLEM TO BE SOLVED: To provide a resonance drive circuit which can prevent a main switch element from being switched erroneously, which is caused by unnecessary oscillation of the main switch input capacity voltage of a main switch element. SOLUTION: Switch elements SW3, SW4 are provided. The switch element SW3 switches on when energy is charged in the main switch input capacitor Ciss and the voltage of the main switch input capacitor Ciss reaches the switch-on drive voltage (input power source Vin voltage) of the main switch element Q1 , and fixes input capacitor voltage at input power source voltage for switch-on period up to the switch-on period completion of the main switch element Q1 . The switch element SW4 switches on when the charged energy of the main switch input capacitor Ciss is discharged and input capacitor voltage drops to 0V, and fixes the input capacitor voltage at 0V for switch-on period up to the switch-off period completion of the a main switch element Q1 . |
