Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1995-06-07
1997-04-15
Martin, David S.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361160, 361167, 307 38, 307 39, 323271, 323272, 123490, H01H 4732
Patent
active
056216041
ABSTRACT:
This invention relates to driving solenoid and motor loads while providing the means for fast turn on and fast turn off. Many applications including automotive fuel injector drivers, Anti-Skid Braking (ABS) solenoid and motor drivers, and other electro-mechanical motion control require the ability to quickly turn on or off a number of devices. The invention utilizes a bridge architecture to drive the loads and to turn on and off individual devices. The invention employs a diode and a switch for each device controlled plus a single master diode and a single master switch. The invention thereby reduces the number of components needed to control N devices to 2*N+2 from prior art half bridge circuit 4*N. Novel techniques and algorithms are used to multiplex the single master switch and control multiple inductive devices. The system provides redundant control and error checking means to preclude single point failure mechanisms.
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Ganjoo Peter
Martin David S.
Millers David T.
Siliconix Inc.
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