Multi-resonance circuit suitable for LED multi-path precise constant current driver

Abstract

The invention discloses a multi-resonance circuit suitable for an LED multi-path precise constant current driver. The multi-resonance circuit comprises a high-frequency pulse AC source, an impedance network, a resonance capacitor, a high-frequency transformer, two-path rectifying filter circuits and two-path LED loads, wherein the high-frequency resonance capacitor and the impedance network form a high-frequency resonance network which participates in the resonant transformation of a main circuit and has a blocking function, namely, balancing the voltage differences of the two-path LED loads to equalize the average current flowing through the two-path LED loads; and under an ideal condition, when the voltage drop of the two-path LED loads are completely equal, the voltages at the two endsof the resonance capacitor are zero. The multi-resonance circuit has the advantages of: 1, achievement of equalizing current among the multi-path LED loads through a primary converting circuit, low cost, no need of additional control circuits, and high reliability; 2, high precision of equalizing current, and insusceptibility to the voltage differences of the two-path LED loads; 3, high efficiency of the achievement of the equalizing current through a blocking capacitor, and little loss in the achievement of the equalizing current even if the voltage differences of the two-path LED loads are large.

Description

technical field [0001] The invention relates to a circuit capable of realizing accurate constant current driving of LEDs. Specifically, it should be a multi-component resonant circuit to realize constant current drive of two or more LED loads. Background technique [0002] For the application of LED multi-channel constant current control driver, the most commonly used solutions are: 1. Constant voltage module + multi-channel non-isolated DC / DC constant current circuit (such as BUCK circuit); 2. Voltage adjustable voltage regulator module + multi-line Sexually adjust the constant current circuit. [0003] For the first option, refer to figure 1 , the output of the constant voltage module is used as the input of multiple constant current circuits, and each constant current circuit is independently controlled by constant current, which can easily ensure the current sharing of multiple output currents. However, because the voltage of the constant voltage module and the voltag...

AI Technical Summary

Problems solved by technology

Although the circuit cost of this solution is low and the current sharing of each LED is good, short circuit is a common failure mode of LEDs. When the voltage difference of multiple LEDs is relatively large, the power consumption of the linear adjustment tube is very large, which makes the LED driver seriously heat.

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