Charge balancing current sampler for a digital motor control

Details Charge balancing current sampler for a digital motor control Charge balancing current sampler for a digital motor control

1987-08-04

1989-02-14

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345E, 318317, H02P 7285

Patent

active

048048950

ABSTRACT:
An analog current sensing circuit is controlled by a current loop microprocessor. An integrator circuit stores charge which is the integral of armature current in a motor. The output is read by the microprocessor and divided by a time value to determine an average value of current. The microprocessor generates a pulse to discharge a capacitor in the integrator circuit to the same extent it was charged by a current feedback signal. At the same time the circuit may be sensing current for the next cycle. Leftover fractions of pulses are stored as charge on the capacitor and are included in values sensed in succeeding cycles. Both a method and a circuit are disclosed.

REFERENCES:
patent: 3955130 (1976-05-01), Graf
patent: 4165476 (1979-08-01), Weiser
patent: 4361831 (1982-11-01), Grutzdiek et al.
patent: 4546424 (1985-10-01), Nolan
patent: 4549122 (1985-10-01), Berkopec et al.
patent: 4553187 (1985-11-01), Burns et al.
patent: 4684856 (1987-08-01), Kahkipuro
patent: 4716535 (1987-12-01), Yoshida et al.

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