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Frequency compensation circuit-based white LED step-up conversion system

A frequency compensation, boost conversion technology, applied in the field of white LED boost conversion system, can solve the problem of inability to output constant current, and achieve the effect of eliminating oscillation, improving stability, and avoiding 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 a frequency compensation circuit

Method used

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  • Frequency compensation circuit-based white LED step-up conversion system
  • Frequency compensation circuit-based white LED step-up 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, a frequency compensation 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, and a capacitor C3 is composed of inductor L1 and inductor L2.

[0016] Wherein, the constant current output circuit is connected to the VAUX pin of the processing chip U. The frequency compensation circuit is connected with the L 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 res...

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Abstract

The invention discloses a frequency compensation circuit-based white LED step-up conversion system. The frequency compensation circuit-based white LED step-up conversion system is characterized by mainly comprising a processing chip U, a diode D1, a field effect tube MOS, a frequency compensation circuit, a constant current output circuit, an inductor L1 and the like, wherein the frequency compensation circuit is connected with an L pin of the processing chip U; 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 frequency compensation circuit-based 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; a plurality of white LEDs are consistent in brightness; the oscillating phenomenon in the system can be eliminated; and the stability of the frequency compensation circuit-based white LED step-up conversion system is greatly improved.

Description

technical field [0001] The invention relates to the field of temperature control, in particular to a white light LED step-up conversion system based on a frequency compensation 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 a constant current, and provide a white LED boost conversion system based on a frequency compensation circuit. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08G09G3/34H05B44/00
CPCG09G3/3406H05B45/37
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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