LED driving circuit and secondary side controller thereof

A light-emitting diode and secondary-side control technology, which is applied to semiconductor devices of light-emitting elements, circuit layout, lamp circuit layout, etc., can solve problems affecting the accuracy of dimming control, increase, and increase the cost of light-emitting diode drive circuits, etc., to achieve Avoid excessive voltage stress or inaccurate dimming control, cost simplification, and reduce electromagnetic interference
CN101489335AInactive Publication Date: 2009-07-22NIKO SEMICON
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
NIKO SEMICON
Publication Date
2009-07-22
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A light emitting diode driving circuit of the invention and a secondary side controller control the output voltage to a first driving voltage or a second driving voltage. When the output voltage is in the first driving voltage, the light emitting diode module can be in a stable light emitting state. When the output voltage is in the second driving voltage, the output voltage is approximately in the threshold voltage (larger than zero voltage) of light emitting diode module so that the light emitting diode module hardly radiates. Thus the variation of voltage applied to the light emitting diode module is less than the present voltage variation in light modulation process, thereby avoiding the problem of overlarge voltage stress or inaccurate light modulation control of light emitting diodein prior art.
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Description

technical field

[0001] The present invention relates to a light-emitting diode driving circuit with dimming function and its secondary side controller, especially to a light-emitting diode driving voltage that can be controlled between a first driving voltage and a second driving voltage during the dimming process. LED driver circuit and its secondary side controller. Background technique

[0002] Such as figure 1 Shown is the existing step-down (Buck) light-emitting diode drive circuit. When the transistor switch Q2 is turned on (TURN ON), the power supply V4 provides current to flow through the transistor switch Q2 to charge and store the inductor L1 and the capacitor C4 and at the same time provide energy to the LEDs D2 and D5 to make them emit light. When the transistor switch Q2 is turned off (TURN OFF), the inductor L1 and the capacitor C4 release energy to make the light emitting diodes D2 and D5 continue to emit light. The current flowing through the LEDs D2 and D...

Claims

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