Patent ID: 6995989

Claim:
A half-bridge-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 a DC power source into an AC power source provided for a load, said half-bridge-type control signal generating circuit comprising: an AND-gate logic unit for performing an AND operation and outputting a first control signal; a NAND-gate logic unit for performing a NAND operation and outputting a second control signal; a circuit protection unit connected to said AND-gate logic unit and said NAND-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 AND-gate logic unit and to said NAND-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 getting 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 AND-gate logic unit and said NAND-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 AND-gate logic unit and said NAND-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 AND-gate logic unit and said NAND-gate logic unit for receiving said sawtooth signal to output a dead time adjustment signal.