White LED step-up conversion system

A technology of step-up conversion and white light, applied in the field of temperature control, can solve problems such as unable to output constant current, achieve consistent brightness and avoid brightness changes

Inactive Publication Date: 2016-09-28
成都特普瑞斯节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the existing boost conversion system cannot output a constant current, and to provide a white LED boost conversion system

Method used

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  • White LED step-up conversion system

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Embodiment

[0012] Such as figure 1 As shown, the present invention is mainly composed of a processing chip U, a constant current output circuit, a diode D1, a field effect transistor MOS, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, and an inductor L1 And inductance L2 composition.

[0013] Wherein, the constant current output circuit is connected to the VAUX pin of the processing chip U. One end of the inductor L1 is connected to the N pole of the diode D1, and the other end thereof is connected to the drain of the field effect transistor MOS after passing through the resistor R5. The anode of the capacitor C2 is connected to the N pole of the diode D1, and its cathode is connected to the connection point of the inductor L1 and the resistor R5 after passing through the resistor R2. The resistor R3 is connected in series between the VAUX pin of the processing chip U and the gate of the field effect transistor...

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PUM

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Abstract

The invention discloses a white LED step-up conversion system. The white LED step-up conversion system is characterized by mainly comprising a processing chip U, a diode D1, a field effect tube MOS, a constant current output circuit, an inductor L1 and the like, wherein the constant current output circuit is connected with a VOUT pin of the processing chip U; and one end of the inductor L1 is connected with an N electrode of the diode D1 and the other end passes through a resistor R5 and then is connected with a drain of the field effect tube MOS. A TPS61200 integrated chip is originally combined with a novel peripheral circuit, so that the condition that the white LED step-up conversion system can output constant current is ensured; constant current driving is provided for white LEDs; brightness changes of the white LEDs caused by a voltage change are avoided; and different white LEDs are consistent in brightness.

Description

technical field [0001] The invention relates to the field of temperature control, in particular to a white light LED boost conversion system. Background technique [0002] Currently, color LCD displays are widely used in portable products, and white LEDs are used as backlights. In order to make white LEDs work, a boost conversion system is now usually used to power white LEDs. However, the existing boost conversion system cannot output constant current, that is, it cannot provide constant current drive for white LEDs, resulting in changes in the brightness of white LEDs when the power supply voltage changes, or brightness mismatch among multiple white LEDs . Contents of the invention [0003] The purpose of the present invention is to overcome the defect that the existing boost conversion system cannot output constant current, and provide a white LED boost conversion system. [0004] The object of the present invention is achieved through the following technical solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 不公告发明人
Owner 成都特普瑞斯节能环保科技有限公司
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