Onduleur pur SINUS MLI ► Variateur de fréquence & convertisseur 24 Vcc ► 230 Vac [démo]

Raccourcis:
4:52 ► Variations de vitesse sur pompe à moteur synchrone
9:38 ► Explications techniques
11:44 ► Tension brute en sortie d'onduleur
16:35 ► Tension après filtrage
18:25 ► Introduction conversion "12V / 230 V"
19:50 ► Essais de charges sous 230 V

Site:https://sites.google.com/site/iodurev...

Ceci est une version très différente et fortement amélioré de ce qui a été présenté il y a plusieurs mois sur:
   • Onduleur MLI SINUS "homemade" ► Variateur ...  


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Demonstration of an homemade pure sine wave inverter with variable frequency.
400 pulses are used every time for rebuild one sinusoïde period of low frequency.
This montage uses a microcontroller to provide a pwm signal with a variable duty cycle.
The differents duty cycle used are calculated from the equation of a sinusoïdal signal.
A full bridge with specifics mosfets drivers are employed to go from the PWM signal to the "power".

A synchronous buck converter is used previous the inverter stage to provides the DC BUS voltage. The DC BUS has a variable value according of the output frequency of the inverter to ensure the working of constant V/f.

After filtering of the output voltage with a low pass filter we get a sinusoïdal voltage.
The filtering is easy because we have a 400 factor between the utile frequency (16 to 60 Hz) and the switching of mosfets in the full bridge.