PDM and PFM hybrid control of a series-resonant inverter for corona surface treatment

A corona surface treatment based on a pulse density modulation (PDM) and pulse frequency modulation (PFM) hybrid control scheme is presented. The PDM scheme is used to regulate the output power of the inverter and the PFM scheme is used to compensate for temperature and other environmental influences on the discharge. Experimental results show that the PDM and PFM hybrid control series-resonant inverter (SRI) makes the corona discharge treatment simple and compact, thus leading to higher efficiency. The hybrid control SRI is able to realise constant frequency control and linear power adjustment and is thus becoming an ideal choice for corona discharge treatment.