Device for the correction of the power factor in power...

Details Device for the correction of the power factor in power... Device for the correction of the power factor in power...

2005-09-20

2005-09-20

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

For reactive power control

Using converter

C323S222000, C323S285000

Reexamination Certificate

active

06946819

ABSTRACT:
A device for the correction of the power factor in power supply units with forced switching operating in transition mode is described. The device comprises a converter and a control device coupled to said converter so as to obtain from an alternating network input voltage a regulated output voltage on the output terminal. The converter comprises a power transistor and the control device comprises a pilot circuit suitable for determining the period of switched-on time and the period of switched-off time of said power transistor and control means coupled to said pilot circuits and with said converter and which are capable of prolonging said period of switched-on time of the power transistor at the instants of time in which the alternating network voltage substantially assumes the value zero.

REFERENCES:
patent: 5349284 (1994-09-01), Whittle
patent: 5614810 (1997-03-01), Nostwick et al.
patent: 5867379 (1999-02-01), Maksimovic et al.
patent: 5949229 (1999-09-01), Choi et al.
patent: 6222746 (2001-04-01), Kim
patent: 6657417 (2003-12-01), Hwang
Siemens Semiconductor Group—Power Factor Controller TDA 4817, Online, May 1995 XP002234890.

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