Current regulator circuit

Details Current regulator circuit Current regulator circuit

1982-08-09

1984-06-12

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

318341, 318599, 318601, G05B 1128, H02P 516

Patent

active

044545738

ABSTRACT:
A digital current regulator circuit, especially useful for a DC motor, is described which is fed directly, i.e., without power transformers, from the AC mains, via power transistors (T1-T4) that are controlled by pulse modulation and which can work in four-quadrant operation. An A/D converter (12) generates from samples of the motor current, an actual-value signal in the form of a multi-bit parallel binary code; and a binary comparator (20) compares the actual-value code with a theoretical-value code and generates binary error signals if the actual value is greater or less than the theoretical value. To provide DC-isolation of the power transistors and associated circuitry from the control circuitry that generates the error signals, the parallel bits of the actual-value code are transmitted to the control circuitry through an opto-electronic coupler (14). Other opto-electronic couplers (16, 30) can be provided to transmit other control signals.

REFERENCES:
patent: 4066945 (1978-01-01), Korte, Jr.
patent: 4223255 (1980-09-01), Goldman et al.
patent: 4223258 (1980-09-01), Lacy
patent: 4242621 (1980-12-01), Spaulding
patent: 4259626 (1981-03-01), Nomura et al.
patent: 4388570 (1983-06-01), Sangree
M. Schulze et al., "Transistor-Gleichstromsteller fuer reaktionsschnelle Antriebe Kleiner Leistung", Elektrie 28, (1974), H.7, pp. 368-370.
M. Julliere et al., "An `H`-type Switching Mode Power Supply for D.C. Servo Motors", International Journal of Electronics, vol. 46, No. 5, pp. 507-512.
U. Claussen et al., "Motorregelung mit Mikrorechner", Regelungstech-nische Praxis, 1978, Heft 12, pp. 355-359.

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