Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Electrically operated switch controlling the signal circuit
Patent
1989-12-01
1991-06-18
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Electrically operated switch controlling the signal circuit
324121, 324133, 340654, 340664, G08B 2100
Patent
active
050251953
ABSTRACT:
A circuit arrangement includes a lamp filament (1) as a load and a resistor (2) in series with the filament. For detecting the current through the load, the source of a MOSFET (6) is connected with the end of the resistor remote from the filament, the drain of the MOSFET being connected with the other end of the resistor via the primary winding of a step-up transformer (7) and a further resistor (8), a diode (9) being connected between the source and the drain of the MOSFET. If the MOSFET is turned on by an appropriate voltage at an input (11) connected to its gate, the voltage across the secondary winding of the transformer is substantially proportional to the value of the current through the filament.
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Dinh Son
LaRoche Eugene R.
Westinghouse Brake and Signal Holdings Limited
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