Constant voltage output AC phase dimmable LED driver

A dimmer, dimming technology, applied in advanced power conversion. It can solve the problem that the wiring does not provide a fixed real-time connection

Active Publication Date: 2018-07-27
GRE ALPHA ELECTRONICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in retrofit installations, the wiring typically does not provide a fixed live connection at the desired location because it is not necessary for an incandescent lighting dimming circuit to have a fixed live connection
[0003] Furthermore, currently available AC phase dimmable converters that can operate without a fixed real-time input can only operate in constant current mode operation, which is only applicable to LED lighting systems operating with constant current sources

Method used

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  • Constant voltage output AC phase dimmable LED driver
  • Constant voltage output AC phase dimmable LED driver
  • Constant voltage output AC phase dimmable LED driver

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Embodiment Construction

[0013] The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding Background of the Invention or the following Detailed Description. The intent of this embodiment is to present an advanced power converter designed for dimmable LED lighting. This embodiment is specifically aimed at LED lighting applications.

[0014] This embodiment includes an LED driver that provides a constant voltage output rectangular waveform with a duty cycle that varies from 0% to 100%. The LED driver is designed to drive one or more back-end current regulation stages to supply a chopped constant current to the LED load. The second regulation stage can be located in the integrated LED panel or "light engine", so that the LED light output is controlled by a constant voltage converter. It may be possible according to this ...

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Abstract

A method and circuit for dimmable light emitting diode (LED) applications are provided. The circuit includes digital processing circuitry and a DC output chopper. The digital processing circuitry produces a pulse width modulated (PWM) signal in response to one or more of voltage, frequency, dimmer type and phase angle requirements determined from a voltage and a phase position of a received inputsignal. The DC output chopper is coupled to the digital processing circuitry and operates in response to the PWM signal to generate a chopped DC output duty cycle voltage signal from a DC output signal derived from the input signal to provide linear dimming for a LED load.

Description

technical field [0001] The present invention relates generally to light emitting diode (LED) lighting systems, and more particularly to advanced power conversion for dimmable LED lighting applications. Background technique [0002] Current constant voltage output alternating current (AC) phase light emitting diode (LED) lighting system dimmable converters require a dimming live (hot) input connection, a neutral connection, and a ground connection in addition to a fixed live (hot) input connection. However, in retrofit installations, the wiring typically does not provide a fixed live connection at the desired location because it is not necessary for an incandescent lighting dimming circuit to have a fixed live connection. [0003] Furthermore, currently available AC phase dimmable converters that can operate without a fixed real-time input can only operate in constant current mode operation, which is only applicable to LED lighting systems operating with constant current sour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10H05B45/3725H05B45/355Y02B20/30
Inventor 方骏耀
Owner GRE ALPHA ELECTRONICS
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