AC Voltage multiplier - Electronic Circuits Projects Diagrams Free

thone · 24th July 2003, 04:58 PM

Dear all,
Anyone help me please. How can I multiply VAC six time? I try voltage doubler but the output is VDC. I want VAC as an output. My input is +-12VAC. My circuit doesn't consume much current (about 80mA). I don't want to use transformer since it makes my circuit bigger.

Thank you

Sebi · 24th July 2003, 05:20 PM

Without transformer can't do this...

**mechie** · 24th July 2003, 05:34 PM

Can't you use a normal (DC) multiplier and chop the output to give a sort of square wave?

thone · 24th July 2003, 05:45 PM

you mean, use V multiplier and the chop it by FET or TR? if I do this, is power loss higher than using Tranformer? Thank you for ur help

**kinjalgp** · 24th July 2003, 07:45 PM

Certainly not. Effeciency will be better than transformer since no copper or iron losses are present. Also you are not wasting any power but allowing only required power to be delivered to load using electronic switch.

stevez · 24th July 2003, 07:58 PM

My general understanding of transformers is that they are reasonably efficient. I do not want to insult you but have to ask if you realize that power in equals power out minus any inefficiency. In a system that is at or near 100% efficiency the multiplication of the voltage by 6 will result in a current of 1/6 the input current. 80 ma/6 = 13.3 ma. If you've considered that then the next question would be - how efficient does the "transformer" have to be if a normal transformer is not sufficient?

**kinjalgp** · 25th July 2003, 06:48 AM

To my knowledge iron-core transformers are 80-85% effecient while switching circuits are upto 96% effecient.

I didn't mention that transformers are higly ineffecient but comparably switching circuit has better effeciency than transformer.

Jaw174 · 27th July 2003, 03:44 PM

if its only pulling 80 Ma, then use an itty bitty audio transformer. just look inside a disposable flash camera, they haev transformers that step up the voltage to 300 volts.. very simple... what is the final voltage u desire, and for what purpose?

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24th July 2003, 04:58 PM	(permalink)
thone	AC Voltage multiplier Dear all, Anyone help me please. How can I multiply VAC six time? I try voltage doubler but the output is VDC. I want VAC as an output. My input is +-12VAC. My circuit doesn't consume much current (about 80mA). I don't want to use transformer since it makes my circuit bigger. Thank you

24th July 2003, 05:20 PM	(permalink)
Sebi	Without transformer can't do this...

24th July 2003, 05:34 PM	(permalink)
mechie	AC multiplier ? Can't you use a normal (DC) multiplier and chop the output to give a sort of square wave? __________________ I need a memory upgrade ... My head is full !

24th July 2003, 05:45 PM	(permalink)
thone	you mean, use V multiplier and the chop it by FET or TR? if I do this, is power loss higher than using Tranformer? Thank you for ur help

24th July 2003, 07:45 PM	(permalink)
kinjalgp	Certainly not. Effeciency will be better than transformer since no copper or iron losses are present. Also you are not wasting any power but allowing only required power to be delivered to load using electronic switch. __________________ "There is no way to peace, peace is the way!"

24th July 2003, 07:58 PM	(permalink)
stevez	My general understanding of transformers is that they are reasonably efficient. I do not want to insult you but have to ask if you realize that power in equals power out minus any inefficiency. In a system that is at or near 100% efficiency the multiplication of the voltage by 6 will result in a current of 1/6 the input current. 80 ma/6 = 13.3 ma. If you've considered that then the next question would be - how efficient does the "transformer" have to be if a normal transformer is not sufficient? __________________ stevez

25th July 2003, 06:48 AM	(permalink)
kinjalgp	To my knowledge iron-core transformers are 80-85% effecient while switching circuits are upto 96% effecient. I didn't mention that transformers are higly ineffecient but comparably switching circuit has better effeciency than transformer. __________________ "There is no way to peace, peace is the way!"

27th July 2003, 03:44 PM	(permalink)
Jaw174	if its only pulling 80 Ma, then use an itty bitty audio transformer. just look inside a disposable flash camera, they haev transformers that step up the voltage to 300 volts.. very simple... what is the final voltage u desire, and for what purpose? __________________ Do no meddel in the affairs of dragons, for you are tasty and go good with ketchup.