Design Problem: Isolated Filament Current Source 0-5A 5V Maximum

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Shyam Guru Join Date: Aug 2006 Location: AM-51, Deen Dayal Nagar, Gwalior, Madhya Pradesh, MP 474001, India Posts: 3418 Good Answers: 32	Design Problem: Isolated Filament Current Source 0-5A 5V Maximum 07/20/2010 10:57 PM
	This problem is for designers in open. This is a design problem for engineers and can be tried out in open discussion. I am looking for general purpose 5kV Isolated from Ground or common potential, a Filament Current Source 0-5A 5V DC or average maximum voltage to the filament and Peak voltage not exceeding 7.5V else filament may blow off. All types of circuit trace links are welcome. Please give clear details such that these can be experimented and verified by engineering students. I don't mind purchasing few such developed good power supplies. Target price must not exceed $250. To start with one can take 12V 5A DC source to power the circuit and 0-5V control input for 0-5A output and 0-5V monitoring output for the current to load. All inputs and measurement voltages are to be isolated from output current source to filament by 5kV. __________________ Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
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stevem Guru Join Date: Sep 2007 Location: Defreestville, NY Posts: 1072 Good Answers: 87	#1 Re: Design Problem: Isolated Filament Current Source 0-5A 5V Maximum 07/20/2010 11:45 PM
	Faced with a similar problem I designed a lead-acid battery powered current source controlled with a fiber optic link. Our experiment only lasted a couple hours at a time so this may not work for you but it was an inexpensive solution. __________________ Charlie don't surf.
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Shyam Guru Join Date: Aug 2006 Location: AM-51, Deen Dayal Nagar, Gwalior, Madhya Pradesh, MP 474001, India Posts: 3418 Good Answers: 32	#2 In reply to #1 Re: Design Problem: Isolated Filament Current Source 0-5A 5V Maximum 07/21/2010 2:07 AM
	Good idea. However in this case I need precision control and monitoring and fiber optic link is not a bad idea at all. Some kind of optic link sure to be used and perhaps opto isolators will be OK for 5kV. I do have some opto isolators for 16kV isolation. __________________ Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
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drbobwoolery Power-User Join Date: Feb 2010 Location: Vallejo, CA Posts: 127 Good Answers: 8	#3 Re: Design Problem: Isolated Filament Current Source 0-5A 5V Maximum 07/26/2010 11:09 AM
	One of the filament transformers used in X-ray generators plus a 110 V variac would have 70 kV isolation if oil immersed. Oil would probably not be needed for 5 kV. I am looking at two I removed a few years ago. You are welcome to them. contact info in my profiled website.
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