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intelboard
Apprentece

19 Posts
Posted - May 30 2007 :  12:02:04 PM  Show Profile  Visit intelboard's Homepage  Reply with Quote
Is their any method to step-up AC voltage without a transformer ? (Please Reply soon)
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - May 30 2007 :  7:49:27 PM  Show Profile  Reply with Quote
A 555 oscillator can drive a voltage doubler. tripler or quadrupler to increase the voltage but the current is reduced.
An ICL7660 IC doubles the voltage or makes a negative voltage but its output current is pretty low.
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intelboard
Apprentece

19 Posts
Posted - May 31 2007 :  09:19:53 AM  Show Profile  Visit intelboard's Homepage  Reply with Quote
Can any transistor do that thing without decreasing the current
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - May 31 2007 :  10:34:38 AM  Show Profile  Reply with Quote
Make a transistor oscillator then add a voltage multiplier circuit to it.
Power out must equal power in so if the voltage is doubled then the current output is halved.
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intelboard
Apprentece

19 Posts
Posted - May 31 2007 :  11:21:48 AM  Show Profile  Visit intelboard's Homepage  Reply with Quote
Can you show me the schematic of both the circuit - with 555 osc and transistor.
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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Jun 01 2007 :  09:18:49 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
quote:
Originally posted by intelboard

Can you show me the schematic of both the circuit - with 555 osc and transistor.


Please create another topic and discuss the circuit there. This topic is for discussion of the 12V to 120V inverter and related circuits only.
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intelboard
Apprentece

19 Posts
Posted - Jun 01 2007 :  11:01:13 AM  Show Profile  Visit intelboard's Homepage  Reply with Quote
This circuit is also related to 12v to 230v inverter only.
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tim
Mad Scientist

198 Posts
Posted - Jul 04 2007 :  3:40:56 PM  Show Profile  Reply with Quote
is there some kind of formula as to putting mosfet transistors together to run either an inverter or a dc motor controller, i mean the control for the gates on the mosfets.
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Jul 04 2007 :  4:10:04 PM  Show Profile  Reply with Quote
Most Mosfets turn on when their gate is 10V or a little more higher than their source voltage. They turn off when their gate voltage is the same as their source voltage.
For a low frequency square-wave inverter two Mosfets can be driven by a CD4047 Cmos oscillator.
For high frequency pulse-width-modulation for motor speed control then a Mosfet driver IC should be used to quickly charge and discharge the high gate capacitance of the Mosfets, and to provide dead-time so that one Mosfet is off when the other turns on.
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mansoorkkl
Apprentece

India
5 Posts
Posted - Jul 22 2007 :  09:08:17 AM  Show Profile  Reply with Quote
[quote]Originally posted by essien

pls i want a circuit diagram for a 2000 W inverter[12vdc to 230/240vac]
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mansoorkkl
Apprentece

India
5 Posts
Posted - Jul 22 2007 :  09:21:37 AM  Show Profile  Reply with Quote

pls give me a simple low cost circuit diagram for a 2000 W inverter
[12vdc to 220/230/240vac]
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Jul 22 2007 :  09:22:34 AM  Show Profile  Reply with Quote
A 2000W square-wave inverter will dissipate about 400W of heat.
It will draw 200A continuously from a 12V battery at full load which will cause it to explode.
You will need many output transistors, a huge and expensive custom-made transformer and a bus full of car batteries that will take a week to charge.
Rediculous.

Some 2000W inverters operate from 48VDC then four car batteries in series last a few hours.
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mansoorkkl
Apprentece

India
5 Posts
Posted - Jul 22 2007 :  09:28:19 AM  Show Profile  Reply with Quote

pls give me a simple low cost circuit diagram for a 1000 W inverter
[12vdc to 220/230/240vac]
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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Jul 22 2007 :  10:09:00 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
quote:
Originally posted by mansoorkkl


pls give me a simple low cost circuit diagram for a 1000 W inverter
[12vdc to 220/230/240vac]


Please actually read the topic before you post. This has been covered several times.

There will be no low cost circuit. Designing a 1KW inverter is nontrivial. The drive silicone will be very expensive and the transformer very large.
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tim
Mad Scientist

198 Posts
Posted - Jul 25 2007 :  2:57:27 PM  Show Profile  Reply with Quote
well there is 12,000 watt inverters on ebay for 600.00 all you got to do is get a few 8-D batterys and there you go.
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