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

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 thealternating 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...

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 , 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 Low sex

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