Circuit arrangement for determining the load current in a revers

Details Circuit arrangement for determining the load current in a revers Circuit arrangement for determining the load current in a revers

1982-12-14

1985-01-08

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

318341, 363124, H02M 7537

Patent

active

044930151

ABSTRACT:
In a reversible d-c controller, a current transformer having two primary windings as current measuring sensors is provided for determining the load current. The primary windings are connected with opposite winding sense into two diagonally disposed bridge arms of a controller bridge circuit. The secondary winding of the current transformer is coupled through a full wave rectifier and across a load resistor to the input of a sample-and-hold stage which is provided with an electronic sampling switch and at the output of which a signal proportional to the actual value of the load current is present. The bridge circuit comprises 4 bridge arms, each bridge arm having an electronic switch and a reverse biased diode shunted across the switch. Each pair of bridge arms connected to the same side of the power supply buss and coupled across the load form a bypass circuit. In order to evaluate the load current, the sampling switch is closed for a predetermined time whenever the load current circulates in a bypass circuit.

REFERENCES:
patent: 3806787 (1974-04-01), Erler
Leonov et al., "Reversible Transistor Converter for Controlling a DC Motor", Inst. & Exp. Tech. (USA) vol. 21, No. 5, PT. 2, pp. 1354-1357, (Sep.-Oct. 1978).
"Elektrie" 28, (1974), pp. 368-370, by M. Schulze, et al.

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