Inductive measuring arrangement for determining the position of

Details Inductive measuring arrangement for determining the position of Inductive measuring arrangement for determining the position of

1984-04-23

1987-03-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324 59, G01B 714, G01R 2726

Patent

active

046493417

ABSTRACT:
An arrangement for determining the position of a core within a coil improves a voltage across the coil upon generation of an initiating voltage pulse. The initiating voltage pulse can originate from a microprocessor or other electrical timing logic circuit. The charging current in the coil is developed from this initiated time until either a predetermined current level is reached in one embodiment or a predetermined time duration is reached in another embodiment. A microprocessor or other electrical measuring circuit measures either the time duration to reach the predetermined current level or the discharge time following current charging for the predetermined time duration. A microprocessor or other electrical logic circuit derives the core position from the measured time to reach the predetermined current level or the measured discharge time following current charging for the predetermined time duration. A switching element interrupts the charging of the coil before the current can reach a peak level, such timing measurement thereby occurring during the approximately linear portion of the inductive current charging curve.

REFERENCES:
patent: 2937369 (1960-05-01), Newbold et al.
patent: 3197701 (1965-07-01), Sangl et al.
patent: 3886447 (1975-05-01), Tanaka
patent: 4339953 (1982-07-01), Iwasaki
patent: 4384251 (1983-05-01), Schelling et al.

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