A kind of led driving device and its analog dimming circuit, analog dimming method

Abstract

The invention discloses an LED driving device, its analog dimming circuit, and an analog dimming method, wherein the analog dimming circuit of the LED driving device includes a pre-bias module, a debias module and a constant current source module; The pre-bias module performs voltage translation processing on the analog dimming signal, and the debiasing module performs voltage translation processing on the analog dimming signal after voltage translation processing, so that it is in the analog dimming voltage domain; the constant current source module according to After the secondary voltage translation processing, the analog dimming signal outputs the LED control current. By performing secondary voltage translation processing on the analog dimming signal, the voltage relationship between the two translation processes is adjusted so that it is in the analog dimming voltage domain, and 0 %~100% dimming range, broaden the dimming range of LED.

Description

technical field [0001] The invention relates to the technical field of LED lighting, in particular to an LED driving device, an analog dimming circuit, and an analog dimming method. Background technique [0002] In the field of LED analog dimming, such as figure 1 As shown, it is a traditional dimming device. After the DC voltage input signal VALG passes through the voltage follower, it is output to the non-inverting input terminal of the constant current source circuit to control the output current of the constant current source circuit. When the DC voltage input signal VALG is close to 0V, the DC gain of the voltage follower and the constant current source circuit decreases sharply, resulting in a very large error in the constant current output. With the above dimming circuit, the dimming range can only be 5% to 100%, and the dimming range of 0% to 100% cannot be realized, thus affecting the user experience of end customers. [0003] Thereby prior art still needs to impr...

AI Technical Summary

Problems solved by technology

When the DC voltage input signal VALG is close to 0V, the DC gain of the voltage follower and constant current source circuit decreases sharply, resulting in a very large error in the constant current output

With the above dimming circuit, the dimming range can only be 5%~100%, and the dimming range of 0%~100% cannot be realized, thus affecting the user experience of end customers

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