Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1991-10-29
1993-05-25
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
323282, 323300, 361152, H03K 301, H03K 508, G05F 140, F02D 4120
Patent
active
052145611
ABSTRACT:
A current control circuit for controlling a current supplied to the coil 3 of an electromagnetic type actuator includes a power transistor 2 and a current detecting resistor 4 coupled in series with the coil 3. The voltage across the current detecting resistor 4 is amplified by a differential amplifier 10 and held by a capacitor 8 of a peak hold circuit 6. The input pulse signal A is smoothed by a smoothing circuit 14. A differential amplifier 18 compares the outputs C of the smoothing circuit 14 with that D of the peak hold circuit 6. The output of an OR gate 20 turns on the power transistor 2 either when the input pulse A or the output of the differential amplifier 18 is at the high level. The voltage held across the capacitor 8 is reset by the transistor 9 in response to the output of the OR gate 20. The duty factor of the power transistor 2 is automatically adjusted to compensate for the variations in the circuit characteristics.
REFERENCES:
patent: 4978865 (1990-12-01), Hartmann et al.
Krishnan Aditya
Mitsubishi Denki & Kabushiki Kaisha
Pellinen A. D.
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