Electricity: power supply or regulation systems – Remote sensing
Reexamination Certificate
2006-09-05
2006-09-05
Gray, David M. (Department: 2838)
Electricity: power supply or regulation systems
Remote sensing
C323S909000, C318S376000, C318S800000, C318S803000
Reexamination Certificate
active
07102333
ABSTRACT:
A method and an apparatus for controlling the mains bridge of a four-quadrant PWM frequency converter provided with a DC intermediate circuit when the power is flowing in the direction towards the supply network, said frequency converter being provided with an AC inductor (9) to be connected to an alternating voltage source (UU, UV, UW), a controlled mains bridge (10), a DC intermediate circuit (14) and a controlled load bridge (11) for feeding a variable-frequency alternating voltage (US, UR, UT) into a load (12), and said mains bridge being provided with controlled semiconductor switches (V1–V6) and shunt diodes (D1–D6), and wherein the mains bridge (10) is mainly controlled in such manner that the controlled semiconductor switch in the upper branch of the phase having the highest supply voltage instantaneous value and the controlled semiconductor switch in the lower branch of the phase having the lowest supply voltage instantaneous value are conducting. The control of the mains bridge semiconductor switch to be conducting next is advanced by a time sufficient to cause the current of the conducting phase to turn from negative to positive before commutation.
REFERENCES:
patent: 4447868 (1984-05-01), Turnbull
patent: 4449176 (1984-05-01), Turnbull
patent: 4928052 (1990-05-01), Fujioka et al.
patent: 5256949 (1993-10-01), Reichard et al.
patent: 5491392 (1996-02-01), Harada et al.
patent: 5621627 (1997-04-01), Krawchuk et al.
patent: 6166513 (2000-12-01), Hammond
patent: 606501 (1993-07-01), None
patent: 108819 (2002-03-01), None
patent: 62-104481 (1987-05-01), None
patent: 6-327291 (1994-11-01), None
Behm Harry
Gray David M.
Vacon Oyj
LandOfFree
Control of the mains bridge of a frequency converter to... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control of the mains bridge of a frequency converter to..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control of the mains bridge of a frequency converter to... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3554978