Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1992-12-22
1994-09-13
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361152, 361187, 323222, 323282, 323225, H03K 301, H03K 508, F02D 4120, G05F 140
Patent
active
053474198
ABSTRACT:
A solenoid driver applies an actuation current to a solenoid for a predetermined period and a lower holding current thereafter. A switching device pulses the applied current within upper and lower limits to maintain the actuation and holding current amplitudes, the pulses being integrated by solenoid inductance into a substantially steady-state current. A multiprocessing unit determines the amplitudes of solenoid current. A signal representative of desired current amplitudes is compared with a signal representative of measured solenoid current, and a signal representative of the difference therebetween is used to control the switching device. Voltage developed across a resistor in series with the solenoid is input to a differential amplifier having connected to its output a peak detector that mimics the decay rate of current in the solenoid, the signal representative of measured solenoid current being obtained from the peak detector. Power dissipation by the solenoid driver is minimal, and the latter is capable of withstanding a continuous short to a source of electric current. The output of the peak detector is monitored by the microprocessing unit for the detection and logging of faults.
REFERENCES:
patent: 4155112 (1979-05-01), Miller et al.
patent: 5028861 (1991-07-01), Pace et al.
patent: 5120143 (1992-06-01), Fujiwara et al.
patent: 5179496 (1993-01-01), Mimura
patent: 5202813 (1993-04-01), Uota et al.
patent: 5214561 (1993-05-01), Morita
Caron LaVerne A.
Handley Edward F.
Kuo W. Paul
Lane E. James
Eaton Corporation
Krishnan Aditya
Pellinen A. D.
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