Circuit arrangement for determining the polarity and magnitude o

Details Circuit arrangement for determining the polarity and magnitude o Circuit arrangement for determining the polarity and magnitude o

1982-12-14

1985-01-15

Shoop, William M.

Electric power conversion systems

Current conversion

With means to selectively provide d.c. of either polarity

318 65, 318280, 318293, H02M 702

Patent

active

044941811

ABSTRACT:
A circuit arrangement for determining the polarity and the magnitude of the load current in a reversible d-c controller includes a bridge circuit comprising two pairs of bridge arms connected to opposite terminals of the voltage supply bus. Each pair of bridge arms connected to the same side of the supply bus form a bypass circuit connected across the load. Two diagonally disposed bridge arms each contain a primary winding of a current transformer having two primary windings connected in opposite winding phase. Load current normally flows through either pair of diagonally disposed bridge arms, but during pauses in the load drive, circulates in one of the two bypass circuits. Electronic switches in each of the bridge arms are controlled so that the load current circulates in successive bypass periods in an alternating pattern in the two bypass circuits. When current flows in a bypass circuit, a phase sensitive voltage is induced in the single secondary of the current transformer. Signals from the electronic switches in one of the bypass circuits are fed via digital logic circuitry to a further electronic switch which causes an operational amplifier to invert pulses from that bypass circuit alone. A pulse train having a polarity corresponding to the polarity of the load current is thereby obtained. In a further embodiment, a sample-and-hold stage for determining the magnitude and polarity of the load current is provided.

REFERENCES:
patent: 4146827 (1979-03-01), Krohn
patent: 4301496 (1981-11-01), Schwarz
patent: 4314325 (1982-02-01), Siebert
"Elektrie" 28 (1974), pp. 368-370 by M. Schulze, et al.

Affiliated with

Also associated with

Rating

Circuit arrangement for determining the polarity and magnitude o does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit arrangement for determining the polarity and magnitude o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for determining the polarity and magnitude o will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1484514