Capacitor reliability for multiple-voltage power supply systems

Details Capacitor reliability for multiple-voltage power supply systems Capacitor reliability for multiple-voltage power supply systems

2006-09-26

2006-09-26

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C361S233000

Reexamination Certificate

active

07113006

ABSTRACT:
A capacitor circuit having improved reliability includes at least first and second capacitors, a first terminal of the first capacitor connecting to a first source providing a first voltage, a first terminal of the second capacitor connecting to a second source providing a second voltage, the first voltage being greater than the second voltage. The capacitor further includes a voltage comparator having a first input for receiving a voltage representative of the first voltage, a second input for receiving a third voltage provided by a third source, and an output for generating a control signal. The control signal is a function of a difference between the voltage representative of the first voltage and the third voltage. A switch is connected to second terminals of the first and second capacitors. The switch is selectively operable in one of at least a first mode and a second mode in response to the control signal, wherein in the first mode the switch is operative to connect the first and second capacitors together in parallel, and in the second mode the switch is operative to connect the first and second capacitors together in series. The first mode is indicative of the voltage representative of the first voltage being less than or about equal to the third voltage, and the second mode is indicative of the voltage representative of the first voltage being greater than the third voltage.

REFERENCES:
patent: 5461297 (1995-10-01), Crawford
patent: 5581454 (1996-12-01), Collins
patent: 5880921 (1999-03-01), Tham et al.
patent: 6143997 (2000-11-01), Feng et al.
patent: 6538907 (2003-03-01), Hoshino et al.
patent: 6559000 (2003-05-01), Kim et al.
patent: 6563235 (2003-05-01), McIntyre et al.

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