Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
2007-04-17
2007-04-17
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
C361S153000
Reexamination Certificate
active
10527291
ABSTRACT:
A method for regulating the current through an electromagnetic actuator. The actuator, a first switch and a current-measuring circuit form a series circuit. A free-wheeling diode is parallel-connected to the actuator. The first switch is closed and opened by a control and a pulse generator using a PWM signal (PWM=pulse width modulation) in such a way that the current flowing through the actuator and measured by the current-measuring circuit is regulated to a setpoint value (SW). The time duration of one on and off switching cycle of the PWM signal is altered, and a so-called dither function in the form of a low-frequency oscillation is superimposed on the PWM signal.
REFERENCES:
patent: 5432693 (1995-07-01), Anderson
patent: 5914850 (1999-06-01), Johansson
patent: 5924703 (1999-07-01), Ichimaru
patent: 6687555 (2004-02-01), Honda et al.
patent: 199 41 488 (2001-03-01), None
Fackler Rupert
Gussmann Bernd
Klein Christian
Kuehn Willi
Mueller-Vogt Ingo
Jackson Stephen W.
Kenyon & Kenyon LLP
Patel Dharti H.
Robert & Bosch GmbH
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