Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1997-01-27
1998-08-11
Nguyen, Matthew V.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
G05F 1656
Patent
active
057931909
ABSTRACT:
As a front end power factor correction circuit in a rectifier a boost conversion topology is often used. A great problem with this topology is the rectifier diode. This diode must be of a high voltage type in a boost application and will therefore have a large reverse-recovery current before it will block the voltage. This current may cause large losses. With the solution according to the invention care will be taken to the recovery current in a more effective way than any earlier solution has obtained. The proposed circuit comprises essentially a boost circuit, where a main and first inductor L1(3) and a main and first diode D1(4) are connected in series from an input to an output and a main and first capacitor C1(5) from an output to ground. A main and first transistor M1(1) is connected from between the first inductor L1(3) and the first diode D1(4) to ground. An auxiliary and second inductor L11(6), a second diode D11(7) and a second transistor M11(2) are connected in series from between the first inductor L1(3) and the first diode D1(4) to ground. Two other diodes a third and fourth diode D12(10), D13(9) are connected in series from between the second diode D11(7) and the second transistor M11(2) to the output.
REFERENCES:
patent: 4346431 (1982-08-01), Steigerwald
patent: 5313382 (1994-05-01), Farrington
patent: 5457379 (1995-10-01), Jacobs et al.
patent: 5461302 (1995-10-01), Garcia et al.
patent: 5543704 (1996-08-01), Thoren
patent: 5550458 (1996-08-01), Farrington et al.
patent: 5633579 (1997-05-01), Kim
Sahlstrom Thomas
Thoren Christer
Nguyen Matthew V.
Telefonaktiebolaget LM Ericsson
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