Switched noise filter circuit for a DC-DC converter

Details Switched noise filter circuit for a DC-DC converter Switched noise filter circuit for a DC-DC converter

2005-10-25

2005-10-25

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S284000

Reexamination Certificate

active

06958594

ABSTRACT:
A switched noise filter circuit for DC-DC converters which use the instantaneous output voltage to establish the converter's duty ratio. The converter cycles the switching element on and off for time intervals Tonand Toff, respectively. A switching control circuit includes a filter capacitance connected between the feedback node and ground, and a comparator which compares a feedback voltage Vfbwith a fixed voltage Vref; at least one of Tonand Toffis a “modulated” interval which is terminated when Vfbcrosses Vrefdue to the discharge of the filter capacitance. A switched noise filter circuit applies an offset voltage to Vfbduring at least one of Ton, and Toff, with the offset voltage disconnected from Vfbby the beginning of the modulated interval or shortly thereafter. When the offset voltage is properly applied, the effect of extraneous electromagnetic noise coupled into Vfbis reduced.

REFERENCES:
patent: 5747976 (1998-05-01), Wong et al.
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patent: 5912552 (1999-06-01), Tateishi
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patent: 2002/0060559 (2002-05-01), Umemoto
patent: 2005/0017702 (2005-01-01), Kernahan et al.

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