Plural output switching regulator with phase comparison and...

Details Plural output switching regulator with phase comparison and... Plural output switching regulator with phase comparison and...

2007-09-11

2007-09-11

Riley, Shawn (Department: 2838)

Electrical transmission or interconnection systems

Plural load circuit systems

Control of current or power

C307S039000

Reexamination Certificate

active

11369003

ABSTRACT:
Disclosed are a control circuit and control method for a comparator-controlled type DC-DC converter that can prevent the generation of audible noise due to the difference between relevant switching frequencies and prevent the increase in the input power source ripple voltage. A phase comparator FC outputs a compared-result signal CONT in correspondence with the phase difference between an output signal FP2and a delay signal FR1. A delay circuit DLY2performs a feedback control for adjusting the amount of retardation time in correspondence with the compared-result signal CONT. And, the delay circuit DLY2outputs a delay signal FR2after the passage of a prescribed amount of retardation time from the time when the falling edge of an output signal SQB2has been input. At a time t16that is after the passage of a prescribed amount of time, there is obtained a time delay DT2bthat causes the period TT1of the delay signal FR1and the period TT2bof the output signal FP2to coincide with each other and that makes zero the phase difference between the delay signal FR1and the output signal FP2.

REFERENCES:
patent: 4430576 (1984-02-01), Fowler
patent: 2005-012868 (2005-01-01), None
patent: 2005-518775 (2005-06-01), None

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