Multiple frequency switching power supply and methods to operate

Details Multiple frequency switching power supply and methods to operate Multiple frequency switching power supply and methods to operate

1999-08-04

2000-10-03

Riley, Shawn

Electricity: power supply or regulation systems

Output level responsive

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

323284, G05F 144

Patent

active

061278165

ABSTRACT:
A multiple frequency switching power supply including a pulse width modulation circuit having an output, having an input and having a clock signal input. The power supply also includes a switching transistor having first and second current-carrying electrodes and a control electrode. The first current-carrying electrode is coupled to a voltage source, the control electrode is coupled to the output of the pulse width modulation circuit and the second current-carrying electrode is coupled to a power supply output configured to provide a regulated output voltage. The power supply additionally includes a voltage sensing circuit coupled to the power supply output and having an output coupled to the pulse width modulation circuit input and a switch coupled to the clock input of the pulse width modulation circuit. The switch supplies a first clock signal having a first frequency when the power supply is in a normal mode of operation and supplies a second clock signal having a second frequency more than an order of magnitude lower than the first frequency when the power supply is in a standby mode of operation.

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