Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2007-03-27
2007-03-27
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S301000, C315S308000
Reexamination Certificate
active
10968076
ABSTRACT:
A controller for controlling a voltage applied to a load from a power source includes a square wave producing circuit for connection in the circuit with the battery and the lamp. The square wave producing circuit produces a variable duty cycle square wave for controlling application of power to the load in accordance with the duty cycle of the square wave. The square wave producing circuit has a control input for varying the duty cycle of the square wave in response to a voltage at the control input. A voltage varying circuit is connected to the power source for producing a selectively variable voltage that is fed to the control input of the square wave producing circuit for selectively adjusting the duty cycle of the square wave. A low voltage detection circuit is connected to the power source and coupled to the control input of the square wave producing circuit for automatically producing a voltage that decreases the duty cycle of the square wave when the battery voltage decreases to or below a selected level. The selected level may be set according to a value of at least one impedance within the low voltage detection circuit.
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Krieger Michael
Randolph Bruce
Shum Henry
Kaminski Jeffri A.
Kinberg Robert
Tran Thuy Vinh
Vector Products, Inc.
Venable LLP
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