Non-isolated bus converters with voltage divider topology

Details Non-isolated bus converters with voltage divider topology Non-isolated bus converters with voltage divider topology

2007-03-27

2010-06-29

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

C323S282000

Reexamination Certificate

active

07746041

ABSTRACT:
A voltage converter having four switches Q1, Q2, Q3, Q4, connected in series and operated in pairs in a complementary fashion. An input voltage is provided across the four switches. A middle capacitor is connected in parallel with two middle switches Q2, Q3. Voltage output is provided across switches Q3and Q4(i.e. at a midpoint of the four switches). Series-connected output capacitors can be connected in parallel with the set of four switches. The middle capacitor alone or in combination with parallel connected capacitors, when connected to the input voltage or output terminals functions as a capacitive voltage divider for voltage conversion and/or regulation with extremely high efficiency and which can provide either step-down or step-up function. Also, an output inductor can be provided as a perfecting feature to further increase efficiency. Alternatively, two of the four switches can be replaced with rectifying diodes. Alternatively, the voltage converter has two or more sets of four switches connected in parallel. The two sets can be connected by resistor-capacitor ladder, or an inductor-capacitor ladder for charge/voltage sharing to reduce voltage ripple.

REFERENCES:
patent: 6058031 (2000-05-01), Lyons et al.
patent: 6366062 (2002-04-01), Baretich et al.
patent: 6696823 (2004-02-01), Ledenev et al.
patent: 7323829 (2008-01-01), Moyer et al.
patent: 2006/0197491 (2006-09-01), Nojima

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