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problem in fluorescent lamp with electromagnetic ballast

m.reza

Oct 13, 2018
1
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Oct 13, 2018
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Hello
I want to control a fluorescent lamp using electromagnetic ballast with a remote control (pt2264) . I use a 333MHz wireless module and pt 2272 as a wave decoder. to make it cheaper I decide not to use any micro controller so I used two 74hc138 decoder IC and a 74ls109 latch IC. so when you press button 1 the lamp 1 is on and when press it again it turns off.

But there is a problem in its power supply.
when I use led lamps, it's fine. but when I use fluorescent lamp, sometimes goes wrong. for example when you command the light to turn on, it just blinks, relay active and after a short time( about 200ms) deactivate. when I measure the voltage of my circuit's power supply during this happens its vary from one time to another! for instance 7.7v, 3.5v ,9v and even 14v! I measured with a digital voltmeter and I guess we can see higher peak if I use an oscilloscope.

I used different switching power supplies(output: 5v) found in the market.

I upload some simple schematic may help.

could anyone help me please?

thanks.
 

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kellys_eye

Jun 25, 2010
5,126
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Jun 25, 2010
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5,126
The inductive start-up of the fluorescent lamp may be 'pulling' the supply - how are you feeding the system? Is the cable rated for the maximum in-rush current of the lamp? Does your PSU have decent filtering (input) and smoothing (output)?
 

73's de Edd

Aug 21, 2015
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Is the lamp and its ballast located close enough to the obviously unshielded electronics, for there to be an undesired electrostatic/magnetic coupling problem.
Of which, there would be none, if using LED's.
 
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