Patent ID: 7447047

Claim:
A post regulation control circuit of a power supply, comprising: a trigger circuit, coupled to a secondary inductor of the secondary side of a transformer of said power supply; a ramp generator, coupled to said trigger circuit; a first comparator, having a positive input terminal coupled to said ramp generator; a feedback regulation controller, coupled to a negative input terminal of said first comparator and a second output terminal of said power supply, for sending a feedback voltage signal to said negative input terminal; a SR flip-flop, having a R input terminal coupled to a first output terminal of said first comparator and a S input terminal coupled to said trigger circuit; a first delay circuit, coupled to a positive Q output terminal of said SR flip-flop; a second delay circuit, coupled to an opposite Q output terminal of said SR flip-flop; a first inductor, coupled to a first output terminal of said power supply; a second inductor, coupled to said second output terminal; a first power switch, coupled to a first output driver, said first inductor and said second inductor; and a second power switch, coupled to a second output driver, said first power switch, said second inductor and a reference ground; wherein, said trigger circuit detects a voltage waveform at a leading edge or between a leading edge and a trailing edge that is inputted by said secondary inductor, and triggers a pulse signal to reset a voltage of said ramp generator, such that the voltage of said ramp generator is discharged to a first positive voltage and then recharged to a second positive voltage, and further produces a continuous ramp voltage, and after said first comparator compares said feedback voltage signal and said continuous ramp voltage, the output of said first comparator and said pulse signal are inputted into said R input terminal and said S input terminal of said SR flip-flop to produce a power conduction signal and a flywheel conduction signal, and after said power conduction signal is delayed by said first delay circuit, said power conduction signal is inputted to said first output driver to control and electrically conduct said first power switch, such that the power of said power supply is sent to said second output terminal and stored in said second inductor, and when said power conduction signal is cut off, said first power switch is disconnected, and after said flywheel conduction signal is delayed by said second delay circuit, said flywheel conduction signal is inputted to said second output driver to control and electrically conduct said second power switch, such that the power of said second inductor is stored and sent to said second output terminal.