Control circuit for an electromechanical device

Details Control circuit for an electromechanical device Control circuit for an electromechanical device

1998-03-02

1999-07-27

Gaffin, Jeffrey

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361153, 123478, H01H 4728

Patent

active

059301031

ABSTRACT:
A circuit for controlling current flow (I.sub.COIL) through a coil of an electromechanical device (101) uses a first timer (118) to measure the pulse width of a first drive pulse (22) and to store a proportional first value at an output (121). A second timer (124) receives the first value and generates a second value less than the first value to represent a time interval shorter than the pulse width of the first drive pulse. The second timer initiates the time interval with a second drive pulse (24) and provides a sampling signal (V.sub.SAMPLE) as the time interval terminates to sense an average current flow through the coil before the second drive pulse terminates.

REFERENCES:
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patent: 4347544 (1982-08-01), Ohba
patent: 4381481 (1983-04-01), Kuppers et al.
patent: 4393845 (1983-07-01), Seitz
patent: 4402299 (1983-09-01), Nakao et al.
patent: 4545257 (1985-10-01), Tomita
patent: 5126647 (1992-06-01), Blackburn et al.
patent: 5689162 (1997-11-01), Li
patent: 5764039 (1998-06-01), Choi et al.

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