Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-08-28
1991-09-10
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
361 18, 361 92, 361173, 361189, 361160, 307270, H03K 500
Patent
active
050476629
ABSTRACT:
A driver circuit for driving from the same output node (6) an inductive relay (34) and a non-inductive lamp (30) having a transistor (16) for driving the relay and second transistor (18) for driving the lamp and a third transistor (90) having its current electrodes coupled between the control electrodes of the first and second transistors for sensing an inductively-induced voltage at the output node when the first transistor means is disabled to cease driving the relay and for enabling the first transistor in response thereto to dissipate the inductively-induced voltage at the output node so as to protect the second transistor. Alternative couplings of the third transistor to the second transistor are also disclosed.
REFERENCES:
patent: 3648145 (1972-03-01), Meyer et al.
patent: 3809963 (1974-07-01), Hutchinson
patent: 3860855 (1975-01-01), Caswell
patent: 4570198 (1986-02-01), Storti et al.
patent: 4578734 (1986-03-01), Delbosse
patent: 4896244 (1990-07-01), Kaling
patent: 4945358 (1990-07-01), Wrzesinski
patent: 4947283 (1990-08-01), Kono
Cunningham T.
Miller Stanley D.
Motorola Inc.
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