Color temperature adjusting chip capable of being intelligently switched in case of output open circuit

Abstract

The invention provides a color temperature adjusting chip capable of being intelligently switched in the case of an output open circuit. The color temperature adjusting chip comprises a power source input pin, a clock signal input pin, namely, a CLK pin, two switch tube driving pins, an external capacitor pin, a power supply module, a Zener tube Z1, a switch detection module, a ring shift register and a driving module, wherein the power supply module is used for generating an internal power source VDD and a reset signal RST; the internal power source VDD is connected with the external capacitor pin; the Zener tube Z1 is used for clamping a voltage of the CLK pin; an input end of the switch detection module is connected with the CLK pin; an output end of the switch detection module is used for outputting a marking signal OK; the switch detection module is used for detecting whether a switch in a color temperature adjusting chip application circuit is switched on or not; the ring shift register is used for selecting whether to put an output signal S1 and an output signal S2 at high levels or not according to input of the marking signal OK indicating whether the switch is switched on or not in the color temperature adjusting chip application circuit; and the driving module is used for driving the signal S1 and the signal S2 to generate an SW1 signal and an SW2 signal correspondingly on the two switch tube driving pins. Through adoption of the color temperature adjusting chip, the defect of poor user experience effect caused by open circuit of a certain path of LED (Light Emitting Diode) lamp is overcome.

Description

technical field [0001] The invention relates to an LED drive circuit, in particular to a color temperature controller and a drive circuit. Background technique [0002] On the historical stage of lighting products, from the early incandescent lamps to the current LED lighting products, people's requirements for lighting products have gradually changed from simple lighting functions to comfortable and intelligent lighting functions. In the past ten years, various LED technologies have sprung up like mushrooms after rain, and LED color temperature technology has also developed rapidly. Among them, switch color temperature technology is more and more popular because of its low application cost, simple operation, and no need to modify the existing switch lighting system. more attention. [0003] figure 1 It is a simplified schematic diagram of the switch color temperature LED solution in the prior art, as shown in the figure, AC is the input alternating current; K1 is the wall...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a color temperature chip that can be switched intelligently when the output is open, which can solve the defect of poor user experience caused by an open circuit of a certain LED light in the color temperature solution

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