Smoothing circuit for switching power supply for reduction of no

Details Smoothing circuit for switching power supply for reduction of no Smoothing circuit for switching power supply for reduction of no

1998-10-20

2000-02-01

Riley, Shawn

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 48, 323907, 323356, H02M 114

Patent

active

060210540

ABSTRACT:
In a smoothing circuit for a switching power supply having a reactor and a capacitor, the circuit includes a resistor connected in series to the capacitor, a MOSFET connected parallel to the resistor, and a control circuit for turning the MOSFET on only when the voltage at both ends of the resistor increases or decreases to reach reference voltages. Thus, the output waveform is changed from a triangular wave to a sine wave in order to reduce the harmonic components contained in the output ripple. An output noise is reduced stably without reducing efficiency.

REFERENCES:
patent: 3849677 (1974-11-01), Stacey et al.
patent: 4247888 (1981-01-01), Angquist
patent: 4302716 (1981-11-01), Glavitsch et al.

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