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Author Topic: HID Electronic Ballast Dimming  (Read 2340 times)
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SANEMB
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« on: November 20, 2009, 10:42:54 10:42 »

Hi Guys,

I have freezed out the design for 250W HID Electronic Ballast for HID Lamps ( MH/HPS Lamps).

So now I want to have dimming functionality in the above design. How it can be achieved.

Can anyone help me on this.

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solutions
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« Reply #1 on: November 21, 2009, 10:22:36 10:22 »

PWM
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SANEMB
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« Reply #2 on: November 21, 2009, 11:46:57 11:46 »

HID Ballast design topology consists

a. EMI Filter
b. Bridge Rectifier
c. Boost PFC Stage
d. Buck Stage
e. Full Bridge o/p Stage
f. Ignition Stage

Now where I need to use the PWM for Dimming and How it can be done.

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j0k3r
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« Reply #3 on: November 22, 2009, 11:40:40 11:40 »

Perhaps on your Full Bridge o/p Stage.
But is a dark shoot, without the schematic, or more details.
If you give more details, maybe we can help more.

Like "Solutions" says the pwm is the best thing.

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solutions
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« Reply #4 on: November 23, 2009, 07:32:53 07:32 »

Agree. 

Either that or in the buck stage, as the switcher is already there, though the control loop for the buck could be a problem if PWM dim was not contemplated...again, agree.... we need to see the schematic.
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abcsantosh
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« Reply #5 on: November 23, 2009, 01:42:12 13:42 »

Hi look for microchip application note AN809. It explains the basic theory for ballast dimming.

     Digitally Addressable DALI Dimming Ballast App

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011968

or look here

http://www.irf.com/technical-info/refdesigns/lightingkits.html
« Last Edit: November 23, 2009, 01:48:23 13:48 by abcsantosh » Logged
tAhm1D
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« Reply #6 on: November 23, 2009, 06:47:41 18:47 »

Hi,
If you post the schematic, it will  not be difficult to help you.
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