CLC constant-current network-type LED self-current-sharing circuit and control method therefor

A self-current-sharing, network-type technology, applied in electric lamp circuit arrangement, electric light source, lighting device, etc., can solve the problems of difficulty in improving the efficiency of LED drivers, low voltage utilization rate, and increased reactive power circulating current, etc., to improve the utilization of voltage. efficiency and converter efficiency, reducing device stress, and reducing the number of devices

Active Publication Date: 2014-09-24
SOUTHEAST UNIV
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Problems solved by technology

However, the large capacitive reactance of the series capacitor makes there is a phase difference between the input voltage and current, the reactive

Method used

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  • CLC constant-current network-type LED self-current-sharing circuit and control method therefor
  • CLC constant-current network-type LED self-current-sharing circuit and control method therefor
  • CLC constant-current network-type LED self-current-sharing circuit and control method therefor

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Embodiment Construction

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings of the description: the LED self-balancing circuit of the CLC constant current network structure includes a full-bridge inverter circuit 1, an LC resonance branch 2 that presents capacitive impedance at the resonant frequency point, and a transformation ratio 1:n high-frequency transformer 3, N only current sharing capacitor C B1 、C B2 ,...,C BN A current sharing capacitor unit 4 and N LED output modules 5 are formed. The LC resonance branch 2 presenting capacitive impedance at the resonance frequency point, the high frequency transformer 3 and the current sharing capacitor unit 4 form a CLC constant current network structure. The full-bridge inverter circuit 1 includes: a power switch tube Q 1 , Q 3 The bridge arm (the midpoint of the bridge arm is A), Q 2 , Q 4 The composed bridge arm (the midpoint of the bridge arm is B). There is a primary excitation induc...

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Abstract

The invention relates to a CLC constant-current network-type LED self-current-sharing circuit and a control method therefor, and the circuit and method are suitable for an illumination occasion where an LED light source serves as a load. The self-current-sharing circuit comprises a full-bridge inverter circuit, a CLC constant current network, and an LED output module, wherein the CLC constant current network consists of an LC resonance branch circuit which presents capacitive impedance at a resonant frequency point, a high-frequency transformer, and a current-sharing capacitor unit. A switching device of the full-bridge inverter circuit works at a CLC resonant frequency position, can achieve a constant output current and the purification of an input impedance, guarantees that a primary-side output current of the transformer is independent of the characteristics of a load, avoids a reactive loop current, reduces the device stress, and improves the voltage utilization rate and the efficiency of the transformer. Seeing that the self-current-sharing circuit works at the resonant frequency position, the impact from LED non-linear impedance characteristic on an output current is avoided, and a method of fixed frequency control is proposes for achieving the constant-current output of the circuit.

Description

technical field [0001] The invention relates to a CLC constant-current network type LED self-equalizing circuit and a control method thereof, which are suitable for lighting occasions with LED light sources as loads. Background technique [0002] With the development of semiconductor light emitting diode (Light-emitting-diode, LED) technology, LED lighting has been widely used. LED is a current-mode device, and the output light characteristics and volt-ampere electrical characteristics are affected by the current. In order to ensure the output of visible light with sufficient brightness and uniform light color, each LED branch needs to flow the same current. [0003] In order to realize LED branch current sharing, currently existing solutions can be divided into two categories: active current sharing and passive current sharing. Among them, the active current sharing technology achieves current sharing by performing closed-loop feedback control on each LED branch. The curr...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 曲小慧唐亚鹏黄少聪
Owner SOUTHEAST UNIV
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