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Multipath LED constant current drive circuit suitable for non-isolated converter

A constant current drive and conversion circuit technology, applied in the direction of DC power input conversion to DC power output, lamp circuit layout, instruments, etc., can solve the problems of high cost, complex circuit, low reliability, etc., and achieve low cost and simple circuit , High reliability effect

Active Publication Date: 2010-05-12
INVENTRONICS HANGZHOU
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the application of non-isolated converter LED multi-channel constant current control driver, the most common solution is to use multiple independently controlled non-isolated DC/DC constant current circuits (such as BUCK circuits), refer to figure 1 , ea

Method used

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  • Multipath LED constant current drive circuit suitable for non-isolated converter
  • Multipath LED constant current drive circuit suitable for non-isolated converter
  • Multipath LED constant current drive circuit suitable for non-isolated converter

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Example Embodiment

[0032] refer to figure 2 , a multi-channel LED constant current drive circuit suitable for non-isolated converters, in the case of two LED loads, it is characterized in that: the input of the DC / AC conversion circuit is a DC voltage Vdc, and the The current equalizing transformer includes two windings W1 and W2, one output terminal of the DC / AC conversion circuit is connected to the end of the winding W1 with the same name and the end of the winding W2 with the same name, and the end of the winding W1 with the same name and the DC / AC conversion circuit The other output end of the winding W2 is used as the input end of the rectification filter circuit 1, the end of the same name of the winding W2 and the other output end of the DC / AC conversion circuit are used as the input end of the rectification filter circuit 2, and the rectification filter circuit 1 and 2 are respectively connected to two circuits LED load.

[0033] exist figure 2 In the circuit shown, the DC / AC invert...

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Abstract

The invention discloses a multipath LED constant current drive circuit suitable for a non-isolated converter, which comprises a DC/AC converting circuit, a current-equalizing transformer, rectifier filter circuits and LED loads. The multipath LED constant current drive circuit is characterized in that the DC/AC converting circuit converts the input direct voltage into alternating voltage, and the alternating voltage is input to the current-equalizing transformer; the current-equalizing transformer performs balancing control on each path of current; and after passing through each rectifier filter circuit, the current is output to each LED load respectively. The multipath LED constant current drive circuit has the advantages that: 1, the current-equalizing transformer realizes the equalization of a plurality of paths of LED load current, and the cost is low; 2, the current equalization control is realized by the current-equalizing transformer automatically without additional control circuits, and the circuit is simple and has high reliability; and 3, the current-equalizing transformer has a high efficiency to achieve the current equalization, and even the voltage difference of two paths of LEDs is large, the consumption for realizing the current equalization is small.

Description

technical field [0001] The invention relates to a multi-channel LED constant current drive circuit suitable for a non-isolated converter, specifically a circuit for realizing load current balancing of multiple LEDs in a non-isolated converter through a current equalizing transformer. Background technique [0002] For the application of non-isolated converter LED multi-channel constant current control driver, the most common solution is to use multiple independently controlled non-isolated DC / DC constant current circuits (such as BUCK circuits), refer to figure 1 , each DC / DC circuit is independently controlled by constant current, it is easy to ensure the current sharing of multiple output currents, but since each LED is driven by an independent converter and control circuit, the circuit is complex, costly and reliable Sex is low. Contents of the invention [0003] Aiming at the problems existing in the prior art, the invention proposes a multi-output LED constant current...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M3/24
Inventor 葛良安姚晓莉华桂潮
Owner INVENTRONICS HANGZHOU
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