Circuit for maintaining hold-up time while reducing bulk...

Details Circuit for maintaining hold-up time while reducing bulk... Circuit for maintaining hold-up time while reducing bulk...

2006-06-13

2006-06-13

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S224000, C323S284000

Reexamination Certificate

active

07061212

ABSTRACT:
A circuit that utilizes most of the energy stored in the bulk capacitor of an AC to DC or DC to DC converter power supply by providing an intermediate converter between a first stage boost converter and a DC-DC converter. When the bulk voltage starts to fall during the hold-up time, the intermediate converter boosts the falling voltage to maintain the regulated DC input to the DC to DC converter while reducing the operating range and increasing the operating duty cycle, so as to increase efficiency, reduce peak current and voltage stresses. The circuit also reduces the size of the output filter components and reduces the size of the bulk capacitance by up to half.

REFERENCES:
patent: 6504497 (2003-01-01), Jang et al.
patent: 6512352 (2003-01-01), Qian
patent: 6734655 (2004-05-01), Javanifard et al.
patent: 6798177 (2004-09-01), Liu et al.

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