Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1991-11-04
1993-06-22
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361152, 361195, H01H 4732
Patent
active
052220117
ABSTRACT:
Load driver circuit (10) has first and second comparators (Cphd 1, C.sub.2) which receive a load current signal (V.sub.s) indicative of current flowing through a load (11). The comparators provide, as output signals, set on and set off signals (at 21, 23) in response to comparing the load current signal (V.sub.s) with first and second thresholds (T.sub.1, T.sub.2). Driver circuitry (27, 43, 12) receives the set on and set off signals and provides a current control signal (at 18) for controlling load current. Preferably, disabling circuitry (30-34) disables the comparators (C.sub.1, C.sub.2) after and in response to the comparators providing their respective output signals (at 21, 23). Also, preferably enabling circuitry (40-42) enables the comparators (C.sub.1, C.sub.2) in response to comparing a sensed voltage (at 17), indicative of voltage at an output terminal of a switching device (12) that controls load current, with respect to a predetermined voltage (2.5 volts). The selective enabling/disabling of the Comparators (C.sub.1 , C.sub.2) results in minimizing the possible effect of noise with respect to controlling load current since undesired false or repetitive outputs of the comparators are minimized.
REFERENCES:
patent: 4300508 (1981-11-01), Streit et al.
patent: 4680667 (1987-07-01), Petrie
patent: 4729056 (1988-03-01), Edwards et al.
patent: 4736267 (1988-04-01), Karlmann et al.
patent: 4763222 (1988-08-01), Heaston et al.
patent: 4764840 (1988-08-01), Petrie et al.
patent: 4930040 (1990-05-01), Binarsch et al.
Gaffin Jeffrey A.
Melamed Phillip H.
Motorola Inc.
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