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Yes just regular house service. I think that's what you are calling 2 phase.
I just want the inverter to run, for example a standard water heater for a home.
you no need a tapped transformer for that, an 12v-0v-12v to 230v transformer will do the job. check the transformer ratings, colis used and core used it will effect the output.
my first 100W inveretr i used 12-0-12v to 230v transformer with out any PWM and give good result above 200v @100W load
please check your transformer,battery connector,s , and power cables
When you really want sine wave output, you first have to build a 12V to 350..400V isolated converter. This high voltage feeds a full bridge (H-bridge) stage that is PWM modulated with above 20kHz.
A simple LC filter (with small ferrite core) removes the above 20 kHz switching frequency.
This H-bridge approach also can handle inductive loads as the inductive kick is fed back to the DC bus voltage. From a practical point of view, forget filtering a square wave output to get a sine wave output.
Depending on the availability of components, you may consider IGBT's for the H-bridge (check whether there is freewheel diode in it, if not you need 4 fast recovery diodes also).
Hi,
The 20khz ( 20,000Hz ) is required to generate your battery boost from 12v dc to 350 - 400v dc bus. This reduces stress on your Fets or Igbts as the case may be.
Added after 5 minutes:
Hi,
The 20khz ( 20,000Hz ) is required to generate your battery boost from 12v dc to 350 - 400v dc bus. This reduces stress on your Fets or Igbts as the case may be.
Thanks for the reply fidelis,i am not using dc to dc converter or boost converter to step 12v to 340v i am simply talking about the pwm of the carrier freq,it used to be 10ths of khz for generating pure sine wave.
When you really want sine wave output, you first have to build a 12V to 350..400V isolated converter. This high voltage feeds a full bridge (H-bridge) stage that is PWM modulated with above 20kHz.
A simple LC filter (with small ferrite core) removes the above 20 kHz switching frequency.
This H-bridge approach also can handle inductive loads as the inductive kick is fed back to the DC bus voltage. From a practical point of view, forget filtering a square wave output to get a sine wave output.
Depending on the availability of components, you may consider IGBT's for the H-bridge (check whether there is freewheel diode in it, if not you need 4 fast recovery diodes also).
Hi, this inverter is a puresine wave, therefore a pic ic or micro controlers are used,because a refrence sinewave is used to compare with the carrier freq which is 10ths of kHz,so any where the refrence and control signal intersect the output toggle from lo to hi so you expect number of pulses with diffrent duty cyle,digital ic can't not do this work easily.
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