Time division multiplexing LED dimming device, circuit and dimming method thereof

Abstract

The invention discloses a time division multiplexing LED dimming device, circuit and dimming method, the dimming circuit comprises a control module, a voltage generation module, multiple paths of maintenance module and a light emitting module, and the light emitting module comprises a plurality of LED lamp strings and a constant current source unit; the control module converts the multiple paths of dimming data into voltage selection signals according to a preset period and outputs the voltage selection signals to the voltage generation module, so that the voltage generation module selects dimming voltage and outputs the dimming voltage to the multiple paths of maintaining modules; the control module further outputs multiple paths of control signals corresponding to the dimming voltage tothe multiple paths of maintenance modules according to a preset period; and the multiple paths of the maintenance modules select a conductive path according to the control signals to output the dimming voltage to the corresponding constant current source unit to control the brightness of each LED lamp string, so that the brightness adjustment of the multi-path LED lamp strings is realized througha simple circuit structure, and the problems of sudden current change, conduction radiation and stroboflash are also avoided.

Description

technical field [0001] The invention relates to the technical field of LEDs, in particular to a time-division multiplexing LED dimming device, a circuit and a dimming method thereof. Background technique [0002] In LED dimming applications, high-power dimming generally uses a single chip to drive a single LED light string to achieve dimming, and multi-channel dimming requires the use of multiple driver chips; in low-power dimming applications, such as ball The RGBW four-way dimming of bulb lamps or filament lamps is not suitable for such applications due to their small size, and the method of using a single chip to drive a single LED light string is bulky and expensive. However, in existing applications where a single chip drives multiple LED light strings to achieve dimming, PWM dimming signals are generally used to control the turn-on or turn-off time of the MOS tubes below the LED light strings to achieve dimming. This method is accompanied by current A sudden change wi...

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Problems solved by technology

[0004] In view of the deficiencies of the prior art above, the purpose of the present invention is to provide a time-division multiplexing LED dimming device, circuit and dimming method thereof, which can effectively solve the problem of excessive conduction radiation existing in existing LED dimming methods. and strobe problem

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