Jani-Jan Posted April 22, 2007 Report Share Posted April 22, 2007 hi to all and very pleased to see this forumi have many question but its firsti want to ask can i generate a high current 230 with voltage double method?i want to run a pc with it please guide me...here a little clue what i am going to ask. Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 22, 2007 Report Share Posted April 22, 2007 A voltage doubler circuit with capacitors and rectifiers is for very low current loads. A transformer is much more efficient for a power inverter. Quote Link to comment Share on other sites More sharing options...
esp1 Posted April 22, 2007 Report Share Posted April 22, 2007 hi,You say that you want to power a PC from the output?This will mean, if you are using a standard 'desktop' PC it will have to be 230Vac at 50/60HZ.Its possible to buy a +12Vdc to Mains invertor, rated at say 300Watts, that will drive a PC.The circuits you have posted are for doubling, with a Vdc output. Quote Link to comment Share on other sites More sharing options...
Jani-Jan Posted April 22, 2007 Author Report Share Posted April 22, 2007 thanks for answer me siractually i want to make a simple and good inverter.if i use 10000uf then?so i have a idea so i ask now all clear.one thing more to ask...here in my country i see many inverter 12v dc to 220v acits built here localy . battry charging system i dont know how to make same transformer charge the battrey, i dont know how?if any solution there i need... Quote Link to comment Share on other sites More sharing options...
Jani-Jan Posted April 22, 2007 Author Report Share Posted April 22, 2007 hi,You say that you want to power a PC from the output?This will mean, if you are using a standard 'desktop' PC it will have to be 230Vac at 50/60HZ.Its possible to buy a +12Vdc to Mains invertor, rated at say 300Watts, that will drive a PC.The circuits you have posted are for doubling, with a Vdc output.thanks for attend medear as i know computer's power supply can be run by dc :)its tested by meu can oprate tv dvd all which are switch mode power supply with out transformer.becaue ac direct to convert dc inside. now think on it again.br Quote Link to comment Share on other sites More sharing options...
Omni Posted May 22, 2007 Report Share Posted May 22, 2007 I agree with audioguru, a non-transformer method for an inverter is basically for lower current devices.Although, i provided a link below that will convert 12VDC- 230VAC (300W) i am skeptical as to the longevity of the inverter along with what may occur in the event of a sag...http://www.tantronics.co.uk/acatalog/DC_to_AC_Power_Inverters.htmlCircuit below:http://www.aaroncake.net/circuits/inverter.aspFinal note:Use precaution with the above circuit and read the directions provided with the project! :o Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 22, 2007 Report Share Posted May 22, 2007 The author's forum nas hundreds of complaints about this lousy inverter:1) Its capacitors are backwards so they blow up!2) The transistors have an absolute max reverse emitter-base voltage rating of only 7V but when this circuit supplies them with 12V then the emitter-base junctions have avalanche breakdown which creates a very high current in the capacitors and wastes the little amount of power available.3) The base current of the transistors is way too low. The output power is at a reduced voltage and is only about 25W.The text says to use more powerful transistors or a more powerful transformer for more power output. They won't make any difference. Quote Link to comment Share on other sites More sharing options...
Omni Posted May 24, 2007 Report Share Posted May 24, 2007 The author's forum nas hundreds of complaints about this lousy inverter:1) Its capacitors are backwards so they blow up!2) The transistors have an absolute max reverse emitter-base voltage rating of only 7V but when this circuit supplies them with 12V then the emitter-base junctions have avalanche breakdown which creates a very high current in the capacitors and wastes the little amount of power available.3) The base current of the transistors is way too low. The output power is at a reduced voltage and is only about 25W.The text says to use more powerful transistors or a more powerful transformer for more power output. They won't make any difference. Final note:Use precaution with the above circuit and read the directions provided with the project! I agree the circuit requires a bit of changes but to a certain extent it may provide some information.Truthfully, i would purchase a manufactured inverter for safety along with warranty etc... Quote Link to comment Share on other sites More sharing options...
chromei386 Posted April 15, 2010 Report Share Posted April 15, 2010 I picked up a 400W 12v to 240v inverter from Kmart (Aust.) for $30 AUD. It has a fan and a bunch of MOSFETs along with the usual transformers & capacitors. It works well and if it breaks down I refund it. I couldn't buy the parts separately and build one myself for that price. It's clean enough to run a PC from... Quote Link to comment Share on other sites More sharing options...
Guest lerx2010 Posted May 2, 2011 Report Share Posted May 2, 2011 hi!!! audioguro, i need some help of yours, i want to build an in inverter from 5vdc to 45vac can u help me. plsease :) Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 2, 2011 Report Share Posted May 2, 2011 hi!!! audioguro, i need some help of yours, i want to build an in inverter from 5vdc to 45vac can u help me. plsease :)Since you provided no details about how much power and what waveform are required then I don't think you know anything about an inverter circuit.Why only 45VAC? Quote Link to comment Share on other sites More sharing options...
Guest alyna Posted July 24, 2012 Report Share Posted July 24, 2012 The circuit diagram of a very simple voltage doubler using NE555 timer is shown here. Here IC NE555 is wired as an astable mutivibrator operating at around 9KHz. The base of the two transistors (Q1 and Q2) is shorted and output of the astable multivibrator (pin 3) is connected to it. When the output of astable multivibrator is low, Q1 will be OFF and Q2 will be ON. The negative terminal of the capacitor C3 will be shorted to ground through T2 and it will be charged to the input supply voltage. When the output of the astable multi vibrator is high, transistor Q1 will be ON and transistor Q2 will be OFF. The capacitor C4 will be charged to the voltage across capacitor C3 plus the input supply voltage (that is double the input voltage). This is how the circuit works.This voltage doubler circuit can deliver only up to 50mA output current and above that current limit the output voltage will be dramatically reduced. The actual output voltage will be around 19V for a 12V DC input and also the output voltage will be a bit unstable. Anyway, for low current applications this circuit is well enough. Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 25, 2012 Report Share Posted July 25, 2012 The circuit diagram of a very simple voltage doubler using NE555 timer is shown here.You forgot to attach the schematic.I show it with transistors that do not do much and with the 555 without added transistors. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted July 26, 2012 Report Share Posted July 26, 2012 Capacitors are good power transmission components. But electrolytic capacitors, which have the most capacitance, are low voltage. You can combine numerous electrolytic capacitors and achieve a very high current. The NE555 timer can be used or another IC or circuit. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted July 26, 2012 Report Share Posted July 26, 2012 You can combine numerous electrolytic capacitors and achieve a very high current. The NE555 timer can be used or another IC or circuit.No you can't achieve a very high current. Regardless of the capacitors used, the 555's maximum output current is 200mA, which limits the maximum current from the circuit to 100mA, at which point there will be a large voltage drop. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted July 27, 2012 Report Share Posted July 27, 2012 You can't mean a high current voltage multiplier can't be designed from an oscillator. Many high power oscillators use low power oscillators which again get power gain. You can't use electrolytic capacitors because their voltage rating is too low. The inverter designed using a voltage multiplier will have the AC composite and the NE555 timer will need to be decoupled so that the other voltage mutiplier can produce the negative cycle. The two circuits can be switched on and off at 60Hz. Quote Link to comment Share on other sites More sharing options...
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