Patent ID: 8824168
Filing Date: 2014-09-02
Classification: H02M,Y02B

Abstract:
1. A method for dynamically adjusting delay parameters applied to a full bridge phase shifted power supply with synchronous rectification and current doubler that has a transformer with a primary side and a secondary side, a phase shifted full bridge converter connected with the primary side of the transformer and having a top switch and a bottom switch on a leading leg and a top switch and a bottom switch on a lagging leg switched in pairs, a synchronous rectification and current doubler circuit connected with the secondary side of the transformer and having two rectification switches, and a controller switching the top switch and the bottom switch on the leading leg, the top switch and the bottom switch on the lagging leg, and the rectification switches, and the controller embedded with a delay parameter adjusting process, the method comprising steps of: providing multiple combinations of delay parameters, wherein each combination of delay parameters has a first delay parameter and a second delay parameter and the combinations of delay parameters correspond to a range of a load, the first delay parameter represents a time ahead of a rising edge of a driving signal of the top switch on the leading leg, the second delay parameter represents a time behind a falling edge of the driving signal of the top switch on the leading leg, and a corresponding driving signal of the rectification switches is generated by adjusting the rising edge and the falling edge of the driving signal of the top switch on the leading leg according to the first delay parameter and the second delay parameter; determining a present load of the power supply selected from the range of the load; selecting a corresponding combination of delay parameters according to the present load to drive the rectification switches of the synchronous rectification and current doubler circuit with the driving signal of the rectification switches adjusted according to the selected combination of delay parameters; determining if the present load of the power supply is varied; and when the present load of the power supply is varied, resuming the step of selecting a corresponding combination of delay parameters.