I am designing an inverter for a diy project. This inverter should be transformer-less and microprocessor based. I am planning to use a DC-DC converter, but should i used a the Peak voltage or the RMS for the DC-DC output,
and how do i configure the circuit to handle the power i have in mind? How could I limit the device to....say 250W , with a 24v input, the input current would be, 10.42A, how would i ensure that the output is say, 2.1A?
Thanks
The microcontroller won't be the one "taking" the power, so it can control for 200W easily. Why only 200W? It can control for much higher powers as well, if necessary.but i am wondering if the controller will be able to handle that much power, i am considering a 120 VAC output @ 200W using PWM.
It all depend on your designed,push pull is normally used for dc-dc stage and H-bridge for the final output and the dc-dc pwm you can used 38-40khz .I have been busy for a while, but its time to continue my project.
OK, so for the DC-DC stage, i guess a full-bridge boost topology should be OK, and what would be the ideal switching device to use for the intended power range, and also the PWM frequency for the DC-DC stage?
I have been busy for a while, but its time to continue my project.
OK, so for the DC-DC stage, i guess a full-bridge boost topology should be OK, and what would be the ideal switching device to use for the intended power range, and also the PWM frequency for the DC-DC stage?
You can use the full-bridge to drive the ferrite transformer and another full-bridge at the high voltage DC side to convert the DC to 50Hz AC.
For DC-DC, you can use between 30kHz and 100kHz. You can try with 50kHz. The higher the frequency the smaller the required magnetic components, but the higher the switching losses.
For the sinusoidal PWM (SPWM), you can use a modulation frequency between 4kHz and 70kHz. The higher the frequency the smaller the required inductance and capacitance, but the higher the switching losses. I usually use 16kHz to 24kHz.
Hope this helps.
Tahmid.
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