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Driving circuit of light emitting diodes having bypass circuit, and driving method thereof

A technology of light-emitting diodes and driving circuits, which is applied in the direction of electric light sources, electric lamp circuit layout, light sources, etc., and can solve the problems of the performance reduction of the previous stage conversion circuit and the reduction of the number of series-connected light-emitting diodes, etc.

Inactive Publication Date: 2012-10-17
CYNTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adjusting the drive voltage supplied by the power supply circuit using the previous stage conversion circuit will cause the efficiency of the previous stage conversion circuit to decrease
Therefore, for circuit designers, it is not the best choice to reduce the number of LEDs connected in series and to adjust the driving voltage supplied by the power supply circuit by the previous conversion circuit.

Method used

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  • Driving circuit of light emitting diodes having bypass circuit, and driving method thereof
  • Driving circuit of light emitting diodes having bypass circuit, and driving method thereof
  • Driving circuit of light emitting diodes having bypass circuit, and driving method thereof

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Embodiment Construction

[0040] Please refer to image 3 , image 3 It is a schematic diagram illustrating an LED driving circuit 300 with a bypass circuit according to an embodiment of the present invention. The driving circuit 300 includes a power supply circuit 302 , a bypass circuit 304 and a temperature monitoring circuit 306 . The power supply circuit 302 is used to provide a driving voltage Vo to a string of LEDs 308, wherein the string of LEDs 308 includes a plurality of LEDs connected in series, and the power supply circuit 302 is a step-down converter, such as a buck converter, or The power supply circuit 302 can be a step-up / step-down converter, such as Buck-Boost converter, Cuk converter, Sepic converter, Zeta converter, flyback converter (Flyback), Forward converter, push-pull converter Converter (Push-Pull), Half-Bridge Converter (Half-Bridge) or Full-Bridge Converter (Full-Bridge). However, the present invention is not limited to the driving voltage Vo being only supplied to a string...

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PUM

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Abstract

The invention provides a driving circuit of light emitting diodes and a driving method thereof. The driving circuit of light emitting diodes includes a power supply circuit, at least one bypass circuit, and a temperature control circuit. The power supply circuit is used for providing a driving voltage to at least one series of light emitting diodes. Each bypass circuit of the at least one bypass circuit is used for being turned on when an ambient temperature is lower than a predetermined temperature. The temperature control circuit is coupled to the at least one bypass circuit for detecting the ambient temperature, and sending a control signal to the at least one bypass circuit when the ambient temperature is lower than the predetermined temperature. Therefore, the driving voltage can still drive the at least one series of light emitting diodes when the ambient temperature is lower than the predetermined temperature.

Description

technical field [0001] The invention relates to a driving circuit of a light emitting diode and a driving method thereof, in particular to a driving circuit of a light emitting diode with a bypass circuit and a driving method thereof. Background technique [0002] In the lighting circuit application, usually the driving voltage supplied by the power supply circuit is close to the voltage across a string of LEDs, so as to reduce the loss of the lighting circuit. However, when the LEDs operate in a low-temperature environment, since the forward voltage of the LEDs is inversely proportional to the temperature, it may happen that the driving voltage supplied by the power supply circuit is lower than the voltage across a string of LEDs, causing the lighting circuit to fail to operate normally. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram illustrating that the forward voltage of a light-emitting diode is inversely proportional to the temperature. Such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCH05B37/02H05B45/18H05B45/48
Inventor 王伟政吕保儒吕俊弦李正人
Owner CYNTEC