Frequency compensation circuit-based current protection-type white LED step-up conversion system

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

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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 current protection type white LED boost conversion system based on a frequency compensation circuit

Method used

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  • Frequency compensation circuit-based current protection-type white LED step-up conversion system
  • Frequency compensation circuit-based current protection-type white LED step-up conversion system
  • Frequency compensation circuit-based current protection-type white LED step-up conversion system

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Embodiment

[0018] like figure 1 As shown, the present invention mainly consists of a processing chip U, a constant current output circuit, an inrush current limiting 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, and a capacitor Composed of C1, capacitor C2, capacitor C3, inductor L1 and inductor L2.

[0019] 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 surge current limiting 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 capa...

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Abstract

The invention discloses a frequency compensation circuit-based current protection-type white LED step-up conversion system. The frequency compensation circuit-based current protection-type 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 and a constant current output circuit, wherein the frequency compensation circuit is connected with an L pin of the processing chip U; and the constant current output circuit is connected with a VOUT pin of the processing chip U. A TPS61200 integrated chip is originally combined with a novel peripheral circuit, so that the condition that the frequency compensation circuit-based current protection-type 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; surge current generated at the power-on moment can be embedded within the permitted range; the constant current is output; and the white LEDs are prevented from being damaged by the surge current. Meanwhile, the oscillating phenomenon in the system can be eliminated; and the stability of the frequency compensation circuit-based current protection-type 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 current protection white LED boost 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 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 a constant current, and provide a current protection type white LED boost conversion system based on a freque...

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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