Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1997-04-14
1999-03-30
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361156, 361155, 361166, 361167, 361195, 307141, 307139, H01H 4700
Patent
active
058896457
ABSTRACT:
An arrangement for driving actuator coils for two or more driven devices employs a microprocessor or similar controller and an actuator driver circuit. The actuator driver circuit controls two or more relay actuator coils from a single microprocessor output terminal. This output terminal can provide a high, low, or pulse output signal. An amplifier switching device, such as a transistor, whose base is coupled to the output terminal of the microprocessor, drives the first relay actuator coil as its load. A rectifying diode is connected to one end of a capacitor and thence through a negative resistance device to a second relay actuator coil or other driven device. The coil impedances are selected so that the second coil has a significantly higher impedance than the first coil. When output pulses appear at the microprocessor output terminal, the transistor switch pulses on and off, and thus energizes the first coil. Flyback voltage pulses pass through the rectifier diode to charge up the capacitor until its voltage exceeds the threshold voltage of the negative resistance device. Then current flows to energize the second relay actuator coil. By selecting the appropriate pulse rate, the microprocessor can energize either or both actuator coils.
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Kadah Andrew S.
Nguyen Andrew M.
Gaffin Jeffrey A.
Huynh Kim N.
International Controls and Measurement Corp
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