High efficiency power conditioning circuit for lighting device
First Claim
1. A circuit, comprising:
- an input receiving an input voltage;
an output coupled to a control circuit, wherein the control circuit is configured to control a Light Emitting Diode (LED); and
a power conditioning circuit comprising;
charge storing circuitry configured to provide a first discharge operation to the output from a first charge storing element during a first operating stage, provide a second discharge operation to the output from a second charge storing element during a second operating stage, and operate the first charge storing element and the second charge storing element as a voltage divider during a third operating stage, wherein the voltage divider reduces the input voltage into a reduced output voltage at the output for powering and maintaining operation of the LED.
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Accused Products
Abstract
A power conditioning circuit in a light bulb efficiently converts an Alternating Current (AC) input voltage into Direct Current (DC) power for operating LEDs in the light bulb. The power conditioning circuit discharges capacitors when a voltage level of the input voltage drops below a given voltage necessary to operate the LEDs. The capacitors are then recharged when the input voltage is high enough to power the LED. The capacitors are configured to operate as voltage dividers while being charged thus reducing a peak voltage level of the output voltage used for powering the LEDs. The reduced output voltage reduces the overall amount of energy used by the light bulb and reduces the amount of heat radiated by the light bulb.
43 Citations
21 Claims
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1. A circuit, comprising:
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an input receiving an input voltage; an output coupled to a control circuit, wherein the control circuit is configured to control a Light Emitting Diode (LED); and a power conditioning circuit comprising; charge storing circuitry configured to provide a first discharge operation to the output from a first charge storing element during a first operating stage, provide a second discharge operation to the output from a second charge storing element during a second operating stage, and operate the first charge storing element and the second charge storing element as a voltage divider during a third operating stage, wherein the voltage divider reduces the input voltage into a reduced output voltage at the output for powering and maintaining operation of the LED. - View Dependent Claims (2, 4, 5, 6)
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3. A circuit, comprising:
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an input receiving a rectified input voltage; an output coupled to a control circuit, wherein the control circuit is configured to control a Light Emitting Diode (LED); and a power conditioning circuit configured to provide a first discharge operation during a first operating stage, provide a second discharge operation during a second operating stage, and operate as a voltage divider during a third operating stage, wherein the voltage divider divides the input voltage into a reduced output voltage at the output for powering the LED, the power conditioning circuit comprising; a first, a second and a third capacitor, wherein the third capacitor is configured to discharge to the output during the first operating stage, the second capacitor is configured to charge the third capacitor and discharge along with the third capacitor to the output during the second operating stage, and the first and second capacitor are configured to form a voltage divider for reducing the input voltage and be charged by the input voltage during the third operating stage. - View Dependent Claims (7, 8, 9)
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10. A light control circuit, comprising:
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a rectifier circuit configured to convert an Alternating Current (AC) voltage into a rectified input voltage; an output control circuit configured to control operation of a Light Emitting Diode (LED); a power conditioning circuit comprising; an input coupled to the rectifier circuit; an output coupled to the output control circuit and the LED; charge storing circuitry coupled between the input and the output; and a bridge circuit configured to cause the charge storing circuitry to; discharge to the output during a first operating stage, store charge from the rectified input voltage during a second operating stage, and operate as a voltage divider for reducing the rectified input voltage at the output during the second operating stage. - View Dependent Claims (21)
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11. A light control circuit, comprising:
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a rectifier circuit configured to convert an Alternating Current (AC) voltage into an rectified input voltage; an output control circuit configured to control operation of a Light Emitting Diode (LED); a power conditioning circuit comprising; an input coupled to the rectifier circuit; an output coupled to the output control circuit and the LED; a first switch having a first terminal coupled to a first end of the rectifier circuit, a second terminal coupled to the output, and a gate coupled to a second end of the rectifier circuit; and a second switch having a first terminal coupled to the second end of the rectifier circuit, a second terminal coupled to the output, and a gate coupled to the first end of the rectifier circuit. - View Dependent Claims (12, 13, 14)
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15. A light control circuit, comprising:
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a voltage input circuit configured to receive an input voltage; an output control circuit configured to control operation of a Light Emitting Diode (LED); and a power conditioning circuit comprising; the voltage input an output coupled to the output control circuit and the LED; a first capacitor; a second capacitor; and a third capacitor, wherein; the second capacitor charges the third capacitor and the second and third capacitor discharge power to the LED during a first half cycle of the input voltage; and the first capacitor and third capacitor operate as a voltage divider between the input and the output and are charged during the first half cycle of the input voltage. - View Dependent Claims (16)
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17. A method, comprising:
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receiving an input voltage; discharging a charge storage circuit to an output for operating a Light Emitting Diode (LED) during at least part of a time when a voltage level of the input voltage drops below a given voltage level for operating the LED; charging the charge storage circuit with the output voltage when the voltage level of the input voltage is high enough for operating the LED; configuring the charge storage circuit to operate as a voltage divider when being charged by the input voltage, wherein the voltage divider reduces a voltage level of the input voltage used for powering the LED while maintaining the voltage level high enough for operating the LED; and discharging a second charge storing element and a third charge storing element during a first half cycle of the input voltage and using the second charge storing element and the third charge storing element as the voltage divider during the first half cycle of the input voltage; and discharging a first charge storing element and the third charge storing element during a second half cycle of the input voltage and using the first charge storing element and the third charge storing element as a voltage divider during the second half cycle of the input voltage. - View Dependent Claims (20)
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18. A method, comprising:
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receiving an input voltage; discharging a charge storage circuit to an output for operating a Light Emitting Diode (LED) when a voltage level of the input voltage drops below a given voltage level; charging the charge storage circuit when the voltage level of the input voltage is high enough to power the LED; configuring the charge storage circuit to operate as a voltage divider when being charged by the input voltage, wherein the voltage divider reduces a voltage level of the input voltage used for powering the LED; during a first half cycle of the input voltage, discharging a second capacitor and a third capacitor to the output to power the LED when the voltage level of the input voltage drops below the given voltage level; during the first half cycle of the input voltage, charging a first capacitor and the third capacitor when the voltage level of the input voltage is high enough to power the LED; and configuring the first capacitor and the third capacitor to operate as the voltage divider while being charged by the input voltage. - View Dependent Claims (19)
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Specification