최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0821769 (2010-06-23) |
등록번호 | US-8421366 (2013-04-16) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 20 인용 특허 : 654 |
Disclosed herein is an illumination device including light-emitting diodes, an alternating current input, a full-wave rectifier coupled to the alternating current input and configured to produce a rectified voltage output and a power converter, the power converter having a switching element electric
Disclosed herein is an illumination device including light-emitting diodes, an alternating current input, a full-wave rectifier coupled to the alternating current input and configured to produce a rectified voltage output and a power converter, the power converter having a switching element electrically coupled to the rectified voltage output of the full-wave rectifier. An improvement of the illumination device includes a feedback circuit configured to determine an average current across the light-emitting diodes and to invert a signal representing the average current to provide a switching signal to the switching element such that, for a range of operating points, increasing a current drawn into the power converter will decrease LED power and decreasing the current drawn into the power converter will increase LED power.
1. In an illumination device including light-emitting diodes, an alternating current input, a full-wave rectifier coupled to the alternating current input and configured to produce a rectified voltage output and a power converter, the power converter having a switching element electrically coupled t
1. In an illumination device including light-emitting diodes, an alternating current input, a full-wave rectifier coupled to the alternating current input and configured to produce a rectified voltage output and a power converter, the power converter having a switching element electrically coupled to the rectified voltage output of the full-wave rectifier, an improvement comprising: a feedback circuit configured to determine an average current across the light-emitting diodes and to invert a signal representing the average current to provide a switching signal to the switching element such that, for a range of operating points, increasing a current drawn into the power converter will decrease LED power and decreasing the current drawn into the power converter will increase LED power. 2. The device of claim 1 wherein the alternating current input comprises a ballast for a fluorescent bulb. 3. The device of claim 2, further comprising: protection circuitry electrically coupled between the ballast and the full-wave rectifier. 4. The device of claim 1, wherein the light-emitting diodes are coupled to the rectified voltage output of the full-wave rectifier and the single switching element is a low-side switch electrically coupled between the light-emitting diodes and a sense resistor. 5. The device of claim 4, further comprising: an inductor in series with the light-emitting diodes and located between the light-emitting diodes and a connection point of the low-side switch and the light-emitting diodes. 6. The device of claim 5, further comprising: a diode in series with the inductor and the light-emitting diodes and electrically coupled to the rectified voltage output, a diode located between the connection point and the rectified voltage output. 7. The device of claim 4 wherein the current sensed by the sense resistor is a peak current occurring when the low-side switch is closed. 8. The device of claim 1 wherein the feedback circuit is configured to calculate the average current from the peak current obtained from at least one of a sense resistor and the emitted light output. 9. The device of claim 1 wherein the feedback circuit comprises a pulse width modulator and a control system for the pulse width modulator, the control system including an input coupled to the rectified voltage output and a second input coupled to a sense resistor. 10. The device of claim 1 wherein the single switching element is a high-side switch connected between the rectified output voltage and the light-emitting diodes. 11. The device of claim 10, further comprising: an inductor connected in series with the light-emitting diodes at a connection point between the light-emitting diodes and the high-side switch; and wherein a sense resistor is connected in series with the inductor and the light-emitting diodes and is coupled to ground. 12. The device of claim 11, further comprising: a diode connected to a connection point between the high-side switch and the inductor such that the recirculation diode is reverse-biased when the high-side switch is closed; and wherein the recirculation diode is in parallel with the light-emitting diodes. 13. The device of claim 11 wherein the feedback circuit comprises a pulse width modulator and a control system for the pulse width modulator, the control system including a first input coupled to the rectified voltage output and a second input coupled to a sense resistor. 14. The device of claim 1, further comprising: a remote signal receiver configured to receive a remote signal indicating a desired brightness level for the light-emitting diodes; anda dimming circuit responsive to the remote signal receiver and configured to provide a control signal to the feedback circuit indicating the desired brightness level. 15. The device of claim 14, wherein the remote signal receiver comprises one of an infrared receiver and a radio frequency antenna. 16. The device of claim 1, wherein feedback circuit is configured to output a duty cycle with a value greater than the duty cycle used to achieve a maximum value of current through the light-emitting diodes. 17. A method of controlling a feedback circuit for an illumination device having at least one LED and a power converter with a switching element; determining an average current across the at least one LED;inverting a signal representing the average current such that, for a range of operating points, increasing a current drawn into the power converter will decrease LED power and decreasing the current drawn into the power converter will increase LED power; andproviding the switching signal to the switching element.
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