Current sensing circuit for motor controls

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

G - Physics

01

R

318/108, 324/65

G01R 31/00 (2006.01) G01R 19/00 (2006.01) H02M 7/525 (2006.01)

Patent

CA 1196382

CURRENT SENSING CIRCUIT FOR MOTOR CONTROLS Abstract of the Disclosure 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 pro- duces 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.

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