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Posts posted by grateful

  1. Thanks audioguru  :)

    Now i have increase the PWM frequency to 19kHz.  But my inverter design at the output there is a bit different.

    I use ADC to convert a single phase sinewave with peak amplitude of 5V to PWM signals.

    Then, the PWM is used to switch or chop the 220Vdc.

    The output that i obtain now is a PWM with amplitude of 220Vdc for positive half cycle and the negative half cycle (in accordance with the ADC signal).

    Then, my question is how to design the low pass filter circuit (using RC circuit which is easier to control than LC) which able to smoothen this high voltage PWM signals switching at 19kHz?

    So, how can i  design a RC low pass fiter that able to withstand high power(100W) and high frequency. Then, finally output a perfect 220Vac at 50Hz? ???

  2. Hi there everyone :)

    I have constructed the H-bridge circuits which is control by PWM, the frequency of PWM is about 4900Hz.

    Therefore, a single phase PWM sinewave at 220Vrms is generated.

    Then, my questions are how can i filter this 220Vrms PWM sinewave into a perfect sinewave?

    Should I choose LC or RC low pass filter?

    which type of high frequency with high voltage that should i choose for inductor and capacitor component in order to set the cutoff frequency at 50Hz? ???

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