Circuit suitable for multi-path LED current-sharing control
A current control and circuit technology, which is applied in the circuit field of multi-channel LED current sharing control, can solve the problems of high cost, low efficiency and large volume of the subsequent DC/DC constant current circuit, and achieve the goal of reducing cost and volume Effect
Active Publication Date: 2013-11-06
INVENTRONICS HANGZHOU
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Problems solved by technology
But because the voltage difference between the output voltage of the constant voltage source (that is, the input voltage of each constant current source) and the LED is usually large, the efficiency of the subsequent DC / DC constant current circuit is not very high, and the volume is large and the cost is relatively high. high
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[0023] refer to figure 2 , a circuit suitable for multi-channel LED current equalization control in the present invention includes a single-output constant current source, multi-channel DC / DC current equalization circuits and a load composed of multiple LED lamps; each of the DC / DC The current sharing circuit includes a DC / DC conversion circuit, a current sharing control circuit and a PWM signal generator. The DC / DC converter can be various types of DC / DC conversion circuits such as BUCK, BOOST, BUCK-BOOST; the input of each current sharing control circuit comes from the sampling signal of the current of each sampling resistor, After being converted by their respective current sharing control circuits, they become common connecting lines, and are connected with other channels to form a current sharing bus whose voltage is Vshare; each current sampling signal and current sharing bus voltage are carried out inside the current sharing control circuit After comparison and adjust...
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The invention discloses a circuit suitable for multi-path LED current-sharing control, which comprises a single-output constant current source, multiple DC / DC sharing circuits and a load including multiple LED lamps; and each DC / DC sharing circuit comprises a DC / DC converter circuit, a current-sharing control circuit and a PWM (Pulse-Width Modulation) signal generator, wherein each DC / DC sharing circuit is provided with one LED load. The invention has the benefits that firstly, when multiple LED load voltages are close, the multiple DC / DC sharing circuits all work in the high-efficiency state; secondly, the cost and the volume of the multiple DC / DC converters can be effectively reduced; thirdly, the multiple DC / DC sharing circuits are independent from the single-output constant current source, can be independently used as the modules, and are suitable for the standard single constant-current power supply; and the constant current value of the pre-stage single constant-current source is required to be changed according to the demands of dimming, the multiple DC / DC sharing circuits still can keep each path of current automatically shared.
Description
technical field [0001] The invention relates to a circuit suitable for multi-channel LED current equalization control. Specifically, it should be a constant current drive circuit for multi-channel LEDs, which realizes constant current control of multi-channel LED loads by means of current sharing control. Background technique [0002] For the application of LED multi-channel constant current control driver, the most common solution is: constant voltage module + multi-channel non-isolated DC / DC constant current circuit (such as BUCK circuit). refer to figure 1 , The output of the constant voltage module is used as the input of multiple non-isolated DC / DC constant current circuits, and each DC / DC circuit is independently controlled by constant current, which is easy to ensure the current sharing of multiple output currents. But because the voltage difference between the output voltage of the constant voltage source (that is, the input voltage of each constant current source)...
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IPC IPC(8): H05B37/02
Inventor 葛良安华桂潮姚晓莉吴新科
Owner INVENTRONICS HANGZHOU