Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device
Reexamination Certificate
2007-04-10
2007-04-10
Laxton, Gary L (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a transformer or inductor as the final control device
C323S224000, C323S225000, C323S266000, C323S271000, C323S284000
Reexamination Certificate
active
11153544
ABSTRACT:
A DC-DC converting apparatus including a step-up and step-down circuit stepping up/down an input voltage to generate an output voltage and a PWM control circuit. The PWM control circuit generates an error signal, first to third voltages, a first triangular wave signal varying between the first and second voltages, and a second triangular wave signal varying between the third voltage and a fourth voltage determined based on the first to third voltages. The PWM control circuit compares the error signal with the first and second triangular wave signals and causes the step-up and step-down circuit to step up/down the input voltage based on the comparison. The first to fourth voltages V1to V4satisfy V1<V4<V2<V3and V4=V3−(V2−V1). At least one of the first to third voltages is variably set to make a time in which voltage ranges of the first and second triangular wave signals overlap longer than a delay time caused by the comparison.
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Matsuo Masahiro
Nitta Shoichi
Dickstein & Shapiro LLP
Laxton Gary L
Ricoh Company, Ltd
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