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Circuit TL Dimmable Fluorescent light
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Circuit TL Dimmable Fluorescent light

by blckpstv on Sun Sep 26, 2021 5:55 am

Hi I'm last minute taking over a project, and I'm struggle to find the correct circuit to dim a dimmable ballast and TL fluorescent lamp ([Philips HF-R 258 TL-D EII 220-240V][1])

The ballast has a 0-10v dim input that I'm controlling with a PWM through an opamp LM385.
The code below works with a led and makes the TL lamp go on and off. But does not really dim it.

I'm wondering how I could improve the circuit. (Add a better ADC chip? Wire it before the OPAMP?)

Or am I overlooking something and is there another reason why this doesn't work?

This is the current circuit:

[![Fritzing_1][2]][2]
[![Schematic][3]][3]


Simple test code:

//pwm from pin 5 slowly increases,
//then decreases repeatedly

//Initializing LED Pin
int led_pin = 5;
void setup() {
//Declaring LED pin as output
pinMode(led_pin, OUTPUT);
}
void loop() {
//Fading the LED
for(int i=0; i<255; i++){
analogWrite(led_pin, i);
delay(10000);
}
for(int i=255; i>0; i--){
analogWrite(led_pin, i);
delay(10000);
}
}

[1]: https://www.lighting.philips.be/prof/vo ... EU/product
[2]: https://i.stack.imgur.com/VbqvG.png
[3]: https://i.stack.imgur.com/yjsBu.png

blckpstv
 
Posts: 55
Joined: Mon Jan 06, 2014 8:06 pm

Please be positive and constructive with your questions and comments.