Current-resonant switching power supply

Details Current-resonant switching power supply Current-resonant switching power supply

1999-03-11

2000-10-10

Nguyen, Matthew

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363132, H02M 3335, H02M 75387

Patent

active

061308250

ABSTRACT:
In a switching power supply, primary-side MOS transistors are alternately turned on, so that a resonant current flows into the primary winding of a transformer and an alternate power is transferred to the secondary side. The alternate voltage generated at the secondary winding is applied by the voltage generated at the wound-up secondary winding to the gates of secondary-side MOS transistors such that they are turned on respectively in periods when the polarity of the voltage is positive. Rectified currents flow into a capacitor through a choke coil to perform synchronous rectification. If the voltage of a smoothing capacitor becomes higher than the alternate output voltage when the transformer is inverted, reverse currents flow into the secondary-side MOS transistors. With the counterelectromotive force of the choke coil, the reverse currents flowing when the transformer is inverted are suppressed, and the efficiency of the switching power supply is prevented from decreasing.

REFERENCES:
patent: 5132888 (1992-07-01), Lo et al.
patent: 5481449 (1996-01-01), Kheraluwala et al.
patent: 5541827 (1996-07-01), Allfather
patent: 5663877 (1997-09-01), Dittli et al.
L. Xiao, et al., "Soft Switched PWM DC/DC Converter with Synchronous Rectifiers", Intelec, International Telecommunications Energy Conference, U.S., New York, IEEE, vol. Conf. 18, Apr. 1996, pp. 476-484

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