Pulse width modulated servo clutch driver

Details Pulse width modulated servo clutch driver Pulse width modulated servo clutch driver

2008-09-30

2008-09-30

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

Reexamination Certificate

active

11324216

ABSTRACT:
Disclosed is a system and method for controlling a clutch associated with a solenoid using a pulse width modulated (PWM) signal, which keeps the current through the coil constant over a wide temperature range and fluctuations in line voltage. The system may include a voltage source, a switch (such as a FET), a current sensor, and a processor. The system controls the clutch by sampling the voltage source, sampling the current measured by the current sensor, and computing a duty cycle, which is then used to generate a PWM control signal.

REFERENCES:
patent: 4922160 (1990-05-01), Ogawa
patent: 5053960 (1991-10-01), Brekkestran et al.
patent: 5375575 (1994-12-01), Ohishi et al.
patent: 2005/0211936 (2005-09-01), Tabor et al.
patent: 2004300952 (2003-03-01), None

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