Suwanngam, Warachart
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Preferred name
Suwanngam, Warachart
Alternative Name
Suwan-Ngam, Warachart
Suwan-Ngam, W.
Main Affiliation
Email
warachart.su@kmitl.ac.th
2 results
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Item type:Publication, A PSPWM with variable frequency control for a two-output three-level series resonant inverter(2015-08-17); This research paper presents a two-output three-level series resonant inverter by using phase-shifted pulse width modulation with a variable frequency control technique. In order to achieve the boundary condition of operation under ZVS for all switches, this paper will analyze this condition which depends on operating frequency and phase-shifted angle between the gate signals of the outer switches and the inner switches. In addition, the proposed circuit was designed, built and tested. The test has two cases which include fixed frequency control and variable control method. From the experiment, the fixed frequency control cannot obtain the ZVS condition of switches for all phase-shifted angle values. On the other hand, the variable frequency control can maintain the ZVS condition for all phase-shifted angle values that is in line with the proposed concept. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Implementation of two-output three-level series-resonant inverter for induction melting application(2018-01-12); This study aims to present a two-output three-level series-resonant inverter together with an implementation and experiments for an induction melting application. A three-level circuit is applied for each branch of inverter in order to decrease the voltage stress on switching devices. A phase-shifted pulse-width modulation (PSPWM) with variable frequency control is applied for providing and maintaining a zero-voltage switching condition over a wide load range. In addition, the PSPWM could provide symmetrical output voltage and current waveforms that result in decreasing the THD<inf>v</inf> and THD<inf>i</inf> of output waveforms and harmonic losses of high-frequency transformer cores comparing to other PWM schemes. Finally, the prototype was designed, built, and tested to verify the consistency between the experimental results and theories of the proposed inverter.