Current sensing circuit for motor controls

Details Current sensing circuit for motor controls Current sensing circuit for motor controls

1982-09-08

1984-07-24

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318729, H02P 540

Patent

active

044619871

ABSTRACT:
A current sensing circuit includes an impedance network having a capacitor which produces a voltage proportional to the steady-state component of current and an inductance which produces a voltage proportional to the transient component. The capacitor voltage modulates a carrier signal which conveys the steady-state component through an isolation transformer to a demodulator. The transient component is conveyed through a second isolation transformer and is summed with the demodulated steady-state component.

REFERENCES:
patent: 4322671 (1982-03-01), Kawada et al.
patent: 4333046 (1982-06-01), Lee
patent: 4400657 (1983-08-01), Nola
patent: 4404511 (1983-09-01), Nola

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