Electricity: motive power systems – Induction motor systems
Patent
1994-10-12
1995-07-25
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
318811, H02P 700
Patent
active
054365457
ABSTRACT:
A system for accurately measuring current drawn intermittently by an inductive load over a time interval T including a first and a second time subinterval during which the load is in state S1 and state S2 respectively and drawing current and a third time subinterval during which the load is in state S3, an idle state, and drawing substantially zero current is provided. In a preferred embodiment, the current measuring system includes a pilot current detection circuit having a pulse width modulator which generates a 1/2T.sub.1 timing signal representing the average amplitude of the current drawn by the load while in states S1 and S2. A correction circuit generates a logic signal that indicates the time of transition of the inductive load from state S2 to state S3 and from state S3 to state S1. The logic signal is used to clock a first sample and hold circuit to provide a scaling factor utilized to correct the average load current. Thereafter, the average load current and the scaling factor are combined in a multiplier to provide a scaled average load current to control the inductive load.
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Bahr Allen A.
Larson Tony R.
International Business Machines - Corporation
Wysocki Jonathan
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