SYSTEM AND METHOD FOR DIMMABLE CONSTANT POWER LIGHT DRIVER
First Claim
1. An apparatus for supplying power to a luminous load, comprising:
- a sample and hold (S/H) circuit adapted to temporarily generate a first voltage for a defined time interval, wherein the first voltage is based on an input voltage;
a modulator adapted to generate a drive signal including a parameter modulated by the first voltage;
a switching device adapted to turn on and off based on the drive signal;
a transformer adapted to develop a second voltage in response to current produced in a first winding of the transformer in response to the switching device being turned on and off; and
an output circuit adapted to generate a third voltage across the luminous load based on the second voltage.
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Accused Products
Abstract
An apparatus is disclosed that is capable of delivering substantially constant power to a luminous load with variation in the input voltage and the environment temperature. The apparatus may be further adapted to vary the power supplied to the luminous load based on changes in the input voltage produced by a phase control dimmer or external device. Additionally, if the input voltage is changed due to a user controlling a dimmer device to control the brightness of the luminous load, the apparatus is able to control the power delivered to the load in response to the dimmer device. Additionally, the apparatus is adapted to allow the luminous output light intensity to be controlled by changes in a remote control voltage source or variable resister and draws near unity power factor power from the AC input throughout the dimming range when not used with phase control dimmer. The remote control or variable resistor can operate simultaneously with a dimmer to achieve multiple controls for the light output.
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Citations
21 Claims
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1. An apparatus for supplying power to a luminous load, comprising:
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a sample and hold (S/H) circuit adapted to temporarily generate a first voltage for a defined time interval, wherein the first voltage is based on an input voltage; a modulator adapted to generate a drive signal including a parameter modulated by the first voltage; a switching device adapted to turn on and off based on the drive signal; a transformer adapted to develop a second voltage in response to current produced in a first winding of the transformer in response to the switching device being turned on and off; and an output circuit adapted to generate a third voltage across the luminous load based on the second voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification