Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With bootstrap circuit
Patent
1998-03-25
2000-03-28
NuTon, My-Trang
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With bootstrap circuit
G05F 110
Patent
active
060437057
ABSTRACT:
For use in a boost converter having a boost inductor coupled between an input and an output of the boost converter and an output capacitor coupled between rails of the output, an energy storage circuit for, and method of, extending a holdup time of the boost converter. In one embodiment, the energy storage circuit includes: (1) a holdup capacitor coupled to a first rail of the input, (2) a holdup switch, coupled to a second rail of the input and the holdup capacitor, capable of closing during a holdup mode to allow the holdup capacitor to discharge current into the input and (3) a voltage stabilizing circuit, coupled between the holdup capacitor and the output capacitor, that: (3a) when the boost converter is in a normal mode, provides a substantially impeded path for charge current to flow from the output capacitor to charge the holdup capacitor, and (3b) when the boost converter is in an initial phase of the holdup mode, provides a substantially unimpeded path for holdup current to flow from the holdup capacitor to the output capacitor prior to the closing of the holdup switch.
REFERENCES:
patent: 4827151 (1989-05-01), Okado
patent: 5115185 (1992-05-01), Fraidlin et al.
patent: 5258901 (1993-11-01), Fraidlin
patent: 5568041 (1996-10-01), Hesterman
Lucent Technologies - Inc.
Nuton My-Trang
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