Dome light
First Claim
1. An electrical circuit comprising:
- a plurality of light-emitting diodes;
a bulb; and
a switch with only two modes, said modes consisting of on and off;
wherein the circuit is configured to cycle through three states in response to a change in the switch'"'"'s modes, in the following order;
the plurality of light-emitting diodes off and the bulb off, the plurality of light-emitting diodes on and the bulb off, the plurality of light-emitting diodes off and the bulb off, the plurality of light-emitting diodes off and the bulb on, and the plurality of light-emitting diodes off and the bulb off.
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Accused Products
Abstract
A dome light is disclosed which utilizes a rotating knob with ‘on’ and ‘off’ positions to toggle between having either a halogen bulb on or a plurality of red LEDs on, or both off. Dual D-type flip-flops toggle the dome light between states in response the changes of the knob between the ‘on’ and ‘off’ positions. The plurality of red LEDs utilize at least one current regulator to maintain a constant level of illumination. When the halogen bulb is on, further rotation of the knob varies a potentiometer which controls the duty cycle created by a pulse width modulator. The pulse width modulator causes the halogen bulb to be on for portions of each cycle; the longer the ‘on’ time during each cycle, the greater the apparent intensity of illumination by the halogen bulb.
13 Citations
20 Claims
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1. An electrical circuit comprising:
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a plurality of light-emitting diodes; a bulb; and a switch with only two modes, said modes consisting of on and off; wherein the circuit is configured to cycle through three states in response to a change in the switch'"'"'s modes, in the following order;
the plurality of light-emitting diodes off and the bulb off, the plurality of light-emitting diodes on and the bulb off, the plurality of light-emitting diodes off and the bulb off, the plurality of light-emitting diodes off and the bulb on, and the plurality of light-emitting diodes off and the bulb off. - View Dependent Claims (2, 3, 4)
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5. An electrical circuit comprising:
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a halogen bulb; and a pulse width modulation regulator; wherein an apparent illumination intensity of the halogen bulb is controlled by a width of pulses generated by the pulse width modulation regulator; wherein the pulse width modulation regulator is configured to generate a square wave from a DC input, convert said square wave into a triangular waveform, and convert said triangular waveform into a variable pulse width waveform. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A circuit comprising:
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a halogen bulb; and a pulse width modulator; wherein the pulse width modulator is configured to convert a DC input into an AC output with a frequency greater than sixteen hertz; wherein the pulse width modulator is further configured to control a duration that the halogen bulb is on within each cycle. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification