LED stepless color temperature adjustment solution GP9101

zjqmyron

LED stepless color temperature adjustment solution GP9101 [Copy link]

 

LED stepless color temperature adjustment solution GP9101, everyone is welcome to discuss!

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2020-1-19 09:28 上传

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dcexpert

What are the advantages of this solution compared to the single-chip dimming lamp chip with touch function?

qwqwqw2088

How high can the PWM frequency be? It can be used for dimming.

But there are probably many flickering problems

zjqmyron

qwqwqw2088 posted on 2020-1-21 12:06 How high can the frequency of PWM be? It can be used for dimming, but there are probably many flicker problems

Different customers have different requirements for color temperature adjustment. I generally recommend 20KHz, no flicker.

zjqmyron

dcexpert published on 2020-1-19 13:42 Compared with the single-chip dimming lamp chip with touch function, what are the advantages of this solution?

Are there any models that we can compare? Ours has stepless color temperature adjustment and is the best solution we have seen so far.

PowerAnts

Do you know why the advertising law prohibits words like "best" and "optimal"? This is a deceptive act! You can list the advantages one by one, and then give them: good, few, simple, relatively cheap, etc. If it's just the cost and light efficiency, TL431+LM358 will beat you in seconds.

伟林电源

I guess the internal circuit is just as mentioned above. I suggest you change to a 23-6 package, at least you can save some packaging costs.

PowerAnts

Weilin Power posted on 2020-2-2 12:45 It is estimated that the internal circuit is the same as what the above said. I suggest you change to a 23-6 package, at least you can save some packaging costs.

The OP's device has a voltage-controlled PWM generator + 2 complementary pulse outputs. The color temperature is adjusted by adjusting the duty cycle of the two outputs.

People who understand LED lighting should know a common sense: the luminous efficiency of LED decreases as the current increases. Obviously, 100mA, 0.5 duty cycle is not as high as the linear 50mA luminous efficiency. If you want to compete with the original poster's device, the linear solution can even do without TL431, because the original poster's potentiometer is powered by 5V, so I can also use 5V

zjqmyron

PowerAnts posted on 2020-2-2 17:08 The device of the OP has a voltage-controlled PWM generator + 2 complementary pulse outputs. The color temperature is adjusted by adjusting the duty cycle of the two outputs. Understand LED lighting...

The main function of this device is to achieve stepless color temperature adjustment. I am not sure how the TL431+358 solution adjusts the color temperature. As for the light effect you mentioned, our chip does not limit your current size. When the total current and power are determined, there is no such thing as light effect, because adjusting the color temperature does not change the overall current, but only distributes it using complementary PWM.

PowerAnts

zjqmyron posted on 2020-2-11 10:54 The main function of this device is to achieve stepless color temperature adjustment. I am not sure how the TL431+358 solution adjusts the color temperature. As for the light effect you mentioned, we...

No matter how high the resolution of PWM is, it is still discrete, but the step value is relatively small and can be regarded as "stepless". If you don't know how to dim the 358, it means that your company is not good at analog circuits. As for the light effect, I have reminded you above. You can study it yourself. If you don't believe it, use an integrating sphere to test and compare, and you will find how ignorant it is to say that "there is no such thing as light effect".

PowerAnts

When it comes to promoting technology, you need to have data to compare your products, but it is not as good as the consumer market. When selling sanitary napkins on TV, you only need to use a few adjectives.

zjqmyron

PowerAnts published on 2020-2-11 11:10 No matter how high the resolution of PWM is, it is still discrete, but the step value is relatively small and can be regarded as "stepless". I don't know how to dim the 358, which means your company...

Maybe what you said is very powerful, but why do you start by saying that people are ignorant? Please be kind with your words. The coronavirus is ruthless, but people are kind.

I am talking about color temperature adjustment, not light adjustment, because complementary PWM is a popular method, at least for my customers. I am not sure about your TL431+358 solution, so please advise.

I won't explain to you about stepless, because stepless doesn't make much sense in conventional lighting, but I can tell you that ours is truly stepless, and can adjust to any color temperature value. If you are interested, I can also explain to you that this technology comes from our unique ADC technology.

PowerAnts

zjqmyron posted on 2020-2-11 11:37 PowerAnts posted on 2020-2-11 11:10 No matter how high the resolution of PWM is, it is still discrete, but the step value is relatively small and can be regarded as "stepless" ...

If you are not "ignorant", how can you set the color temperature of the synthesized light instead of dimming the single LED?

As for the issue of light efficiency, look at the current-luminous flux curve analysis of LED. This requires an IQ of 100. People with an IQ of 90 cannot understand it by themselves. They need others to explain it to them two or three times before they suddenly wake up.

zjqmyron

PowerAnts posted on 2020-2-11 11:47 If you are not "ignorant", how to set the color temperature of the composite light instead of dimming the single LED? For the light effect, look at the LED current-light...

Haha, okay, I'll just accept your ignorance for now. There's no point in saying more.

I am waiting for you to give me a TL431+358 color temperature adjustment circuit to beat my circuit. If you can't provide it, it's better to keep this "ignorance" to yourself.

PowerAnts

zjqmyron posted on 2020-2-11 11:53 Haha, okay, I'll accept your "ignorance" for now. There's no point in talking too much. I'll wait for you to give me the TL431+358 color temperature adjustment circuit to kill me in seconds...

Since you are so eager to learn, I can definitely satisfy your curiosity in all the posts about this chip on the Internet!

You better believe that I will never talk too much about something I am not sure about.