Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Flashers
Patent
1980-01-11
1981-10-06
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Flashers
307 41, 315193, 315207, 315322, 340 83, H05B 3906
Patent
active
042937957
ABSTRACT:
A solid state flasher relay of the type for switching an AC or a DC voltage across first and second loads interconnected at a common junction. More specifically, a solid state flasher relay is disclosed wherein shunting transistors are selectively controlled so that an AC or a DC voltage applied across two input lines connected to the first and second loads can be either shunted from the first input line to the common junction thereby providing the voltage across the second load, or shunted from the second input line to the common junction thereby applying the voltage across a first load. Shunting is effected by biasing four shunting transistors so that two of the shunting transistors connected between one input line and the common junction line will not conduct, while one of the other two shunting transistors connected across the other input line and the common junction line will conduct, the specific shunting transistor chosen to conduct being determined by the polarity of the voltage applied across the two input lines. This is effected by choosing each of the shunting transistors as either an npn or pnp type and controlling them so that one selectively conducts in accordance with the instanteous input voltage polarity. In addition, the flasher relay disclosed provides a means for effecting this control while at the same time isolating the two input lines and common junction lines from any grounds associated with the flasher relay.
REFERENCES:
patent: 3631392 (1971-12-01), Zelina
patent: 3925704 (1975-12-01), Camic
patent: 3963202 (1976-06-01), Hopkins
WC Solid State (EOR) Flashing Relay, Western-Cullen Division of Federal Sign & Signal Corp., Chicago, Ill., Aug. 1976.
Solid State Grade Crossing Flasher Model 210A, Harmon Electronics Division of Harmon Industries, Inc., May 1975.
La Roche Eugene R.
Southern Pacific Transportation Company
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