Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1989-04-17
1991-08-06
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361152, H01H 4732
Patent
active
050382470
ABSTRACT:
A control for an inductive load switches current on and off to regulate about a command value, a decaying recirculation current flowing through the load during the switch off periods. The current is sensed during the switch on periods and charges a capacitor to provide a simulation signal representing the motor current. The capacitor is allowed to discharge through a resistor during the switch off periods at the rate of the decaying recirculation current. The simulation signal is compared to the command value to control the switching. The simulation signal is sensed during a command value of zero current to determine offset errors for calibration purposes.
REFERENCES:
patent: 4536818 (1985-08-01), Nielsen
patent: 4612597 (1986-09-01), Hamren
patent: 4720762 (1988-01-01), Estes
Hach Larry R.
Kelley Gerard F.
Tallant, II James C.
Conkey Howard N.
Delco Electronics Corporation
Pellinen A. D.
Schultz Christopher S.
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