HIGH VOLTAGE LED AND DRIVER
First Claim
Patent Images
1. An apparatus comprising:
- an LED array including a plurality of LEDs connected in a series for providing illumination; and
an LED driver for providing an operating voltage to said LED array, said LED driver including;
a rectifier circuit for rectifying an AC power source into a DC power source providing a DC source voltage;
a filter for filtering the DC source voltage;
a voltage boost circuit for boosting the DC source voltage for providing an LED drive voltage; and
an oscillating circuit for driving the voltage boost circuit at an oscillation frequency, wherein the oscillating boost circuit is self-oscillating
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Abstract
A method and apparatus for providing illumination by driving LEDs using a high-voltage driver, and more specifically a method and apparatus for using a simplified boost circuit connected to an AC mains to provide a higher voltage DC driving voltage to the LED array.
39 Citations
28 Claims
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1. An apparatus comprising:
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an LED array including a plurality of LEDs connected in a series for providing illumination; and an LED driver for providing an operating voltage to said LED array, said LED driver including; a rectifier circuit for rectifying an AC power source into a DC power source providing a DC source voltage; a filter for filtering the DC source voltage; a voltage boost circuit for boosting the DC source voltage for providing an LED drive voltage; and an oscillating circuit for driving the voltage boost circuit at an oscillation frequency, wherein the oscillating boost circuit is self-oscillating - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 28)
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11. An apparatus comprising:
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an LED array including a plurality of LEDs connected in a series for providing illumination; and an LED driver for providing an operating voltage to said LED array, said LED driver including; a rectifier circuit for rectifying an AC power source into a DC power source providing a DC source voltage having an RMS voltage value about equal to the RMS voltage value of the AC power source; a filter for filtering the DC source voltage; a voltage boost circuit for boosting the DC source voltage for providing an LED drive voltage; and an oscillating circuit for driving the voltage boost circuit at an oscillation frequency, wherein the oscillating boost circuit is self-oscillating, wherein said LED drive voltage is utilized for driving the LED array such that the voltage drop across the LED array has an RMS voltage value that is greater than the RMS voltage value of the AC power source. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 27)
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20. An apparatus comprising:
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an LED array including a plurality of LEDs connected in a series for providing illumination; and an LED driver for providing an operating voltage to said LED array, said LED driver including; a rectifier circuit for rectifying an AC power source into a DC power source providing a DC source voltage having an RMS voltage value about equal to the RMS voltage value of the AC power source; a filter for filtering the DC source voltage; a voltage boost circuit for boosting the DC source voltage for providing an LED drive voltage; an oscillating circuit for driving the voltage boost circuit at an oscillation frequency, wherein the oscillating boost circuit is self-oscillating; a bootstrap oscillator power supply for providing power to the oscillating circuit during a power-up phase; an oscillator power supply for supplying power to the oscillator after said power-up phase; a current detecting circuit for controlling a duty cycle of said boost circuit; and a current averaging circuit for filtering out voltage peaks otherwise provided in said oscillating circuit, wherein said LED drive voltage is utilized for driving the LED array such that the voltage drop across the LED array has an RMS voltage value that is greater than the RMS voltage value of the AC power source. - View Dependent Claims (21, 22, 23)
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24. The apparatus of claim 24, wherein said LED driver has a power efficiency of greater than 90%.
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25. An LED Driver for driving an LED array, said LED driver comprising:
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a rectifier circuit for rectifying an AC power source into a DC power source providing a DC source voltage having an RMS voltage value about equal to the RMS voltage value of the AC power source; a filter for filtering the DC source voltage; a voltage boost circuit for boosting the DC source voltage for providing an LED drive voltage; an oscillating circuit for driving the voltage boost circuit at an oscillation frequency, wherein the oscillating boost circuit is self-oscillating; a bootstrap oscillator power supply for providing power to the oscillating circuit during a power-up phase; an oscillator power supply for supplying power to the oscillator after said power-up phase; a current detecting circuit for controlling a duty cycle of said boost circuit; and a current averaging circuit for filtering out voltage peaks otherwise provided in said oscillating circuit, wherein said LED drive voltage is utilized such that the voltage drop across an output has an RMS voltage value that is greater than the RMS voltage value of the AC power source, and wherein a power efficiency of said LED driver is greater than 90%. - View Dependent Claims (26)
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Specification