Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-07-31
2007-07-31
Patel, Rajnikant B. (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S285000
Reexamination Certificate
active
10973257
ABSTRACT:
In a DC-DC converter of synchronous rectifying system, a control circuit of DC-DC converter capable of improving the control voltage value of output voltage at light load and enhancing the power conversion efficiency, and its control method are presented. An inverting input terminal of comparator COMP2of which non-inverting input terminal is connected to a grounding potential is connected to one terminal of choke coil L1by way of terminal (X). An output terminal (N1) of comparator COMP2is connected to a delay circuit DL, and an output terminal (N2) of delay circuit DL is connected to AND gate circuit AND1. The delay circuit DL is a circuit for delaying the transition from high level to low level of input terminal (N1). Excessive power supplied more than demanded by the load at light load is returned to choke coil L1. Elevation of output voltage VOUT due to excess power accumulated in output capacitor C1can be suppressed.
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Ito Hidenobu
Yasukouchi Katsuyuki
Arent & Fox LLP
Fujitsu Limited
Patel Rajnikant B.
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