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Overvoltage protection circuit based white light LED voltage-boosting conversion system

An overvoltage protection circuit and boost conversion technology, applied in the field of temperature control, can solve problems such as inability to output a constant current, achieve the effect of 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 based on an overvoltage protection circuit

Method used

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  • Overvoltage protection circuit based white light LED voltage-boosting conversion system
  • Overvoltage protection circuit based white light LED voltage-boosting conversion system

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Embodiment

[0015] Such as figure 1 As shown, the present invention is mainly composed of a processing chip U, a constant current output circuit, an overvoltage protection 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, and a capacitor C2. The capacitor C3 is composed of the inductor L1 and the inductor L2.

[0016] 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 overvoltage protection circuit is connected in series between the connection point of the resistor R5 and the inductor L1 and the constant current output circuit. The anode of the capacitor C2 is connected to the N pole of the diode D1, and its cathode is connected to the connection poi...

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Abstract

The invention discloses an overvoltage protection circuit based white light LED voltage-boosting conversion system. The white light LED voltage-boosting conversion system is characterized by mainly comprising a processing chip U, a diode D1, a filed effect transistor MOS, a constant-current output circuit, an inductor L1 and the like, wherein the constant-current output circuit is connected with the VOUT pin of the processing chip U; and one end of the inductor L1 is connected with the N pole of the diode D1 while the other end of the inductor L1 passes through a resistor R5 and then is connected with the drain electrode of the filed effect transistor MOS. According to the white light LED voltage-boosting conversion system, the combination of a TPS61200 integrated chip and a novel peripheral circuit is originally and creatively adopted, so that it is ensured that the white light LED voltage-boosting conversion system can output the constant current so as to supply constant-current driving to the white light LED, avoid the luminance changes of the white light LED caused by voltage changes, and enable the luminance of the multiple white light LEDs to be consistent; and in addition, the white light LED voltage-boosting conversion system can be disconnected automatically under an overvoltage state, so that damage to the white light LED by the overvoltage is prevented.

Description

technical field [0001] The invention relates to the field of temperature control, in particular to a white LED boost conversion system based on an overvoltage protection circuit. 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 a constant current, that is, it cannot provide constant current drive to the white LED, which causes the brightness of the white LED to change when the battery voltage changes, or the brightness of multiple white LEDs does not match. . 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 based on an overvoltage protection circuit. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50H05B45/37Y02B20/30
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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