Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1991-02-06
1993-01-12
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
323351, F16D 2700
Patent
active
051794969
ABSTRACT:
An excitation current control device for an automotive electromagnetic clutch includes a first and a second transistor 8 and 13 and a current detector resistor 14, coupled in series with the electromagnetic clutch. The first transistor is PWM controlled to control the amount of excitation current through the electromagnetic clutch. The second transistor turns off the excitation current in response to the disconnection signal for the electromagnetic clutch. The current detector amplifier 6 includes, in addition to an operational amplifier 61 and an input and a feedback resistor 63 and 62, an offset resistor 64 for offsetting the base current of the second transistor and the current flowing through a reverse excitation resistor 12 and the detector resistor 14. Alternatively, the offset correction for base current is effected by a software calculation.
REFERENCES:
patent: 4520282 (1985-05-01), Watanabe et al.
patent: 4535276 (1985-08-01), Yokobori
patent: 5038247 (1991-08-01), Kelley et al.
patent: 5072165 (1991-12-01), Mimura
patent: 5083273 (1992-01-01), Nishiwaki et al.
patent: 5094333 (1992-03-01), Mimura
Mitsubishi Denki K. K.
Osborn David
Pellinen A. D.
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