Push/pull-type control signal generating circuit and method thereof

A push/pull-type control signal generating circuit connected to a primary side of a transformer via two electronic switches for controlling on/off states of said two electronic switches to convert DC power source into AC power source provided for a load, said push/pull-type control signal generating circuit comprising:

• a first AND-gate logic unit for performing an AND operation and outputting a first control signal;
• a second AND-gate logic unit for performing an AND operation and outputting a second control signal;
• a circuit protection unit connected to said first AND-gate logic unit and said second AND-gate logic unit and to a secondary side of said transformer via a feedback circuit for receiving a feedback signal;
• a function generator for generating a sawtooth signal;
• a clock generator connected to said function generator and said first AND-gate logic unit and to said second AND-gate logic unit via an inverter for generating a clock signal based on said sawtooth signal;
• a soft boot unit connected to said clock generator for receiving said clock signal and outputting a boot signal and a count signal to perform boot actions;
• a sample and hold unit connected to said feedback circuit via an error amplifier for obtaining a voltage feedback signal and outputting a voltage feedback hold signal;
• a first comparator connected to said soft boot unit and said function generator for comparing said sawtooth signal and said count signal to output a first comparison signal;
• an OR-gate logic unit connected to said soft boot unit, said first comparator, said first AND-gate logic unit and said second AND-gate logic unit for performing an OR operation to said boot signal and said first comparison signal;
• a second comparator connected to said sample and hold unit, said function generator, said first AND-gate logic unit and said second AND-gate logic unit for comparing said sawtooth signal and said voltage feedback hold signal to output a second comparison signal;
• and
• a dead time control unit connected to said function generator, said first AND-gate logic unit and said second AND-gate logic unit for receiving said sawtooth signal to output a dead time adjustment signal.