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Analysis of a full-bridge inverter for induction heating using asymmetrical phase-shift control under ZVS and NON-ZVS operation
(2007-12-01)
Yongyuth, N.
;
Viriya, P.
;
Matsuse, K.
This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS switching conditions in a high-frequency full-bridge inverter for induction heating, using the principle of asymmetrical phase-shift control over a wide control range both in positive and negative directions. A variety of modes of circuit operation with the voltage and current equations during phase-shift power control under the operating conditions of ZVS and NON-ZVS are analyzed as a first step and the output voltage and current waveforms are obtained by MATLAB program. These waveforms will be analyzed by Fourier analysis which can lead further to the calculation of ac output power P<inf>o</inf>, dc input power P<inf>d</inf>, and hence the conversion efficiency η of the full-bridge inverter. The analysis results shows that the control ranges of ac output power P<inf>o</inf> and dc input power P<inf>d</inf> are limited by the occurrence of NON-ZVS operating condition, which changes according to the switching frequency f<inf>s</inf>. © 2007 IEEE.
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Analysis of a half-bridge inverter for a small-size induction cooker using positive-negative phase-shift control under ZVS and NON-ZVS operation
(2007-12-01)
Achara, P.
;
Viriya, P.
;
Matsuse, K.
This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS conditions in a high-frequency half-bridge inverter for a small-size and low-voltage induction cooker, using the principle of positivenegative phase-shift control over a wide control range both in positive and negative directions. A variety of modes of circuit operation with the voltage and current equations during phase-shift power control under the operating conditions of ZVS and NON-ZVS are analyzed as a first step and the output voltage and current waveforms are obtained by MATLAB program. These waveforms will be analyzed by Fourier analysis which can lead further to the calculation of ac output power P<inf>0</inf>, dc input power P<inf>d</inf>, and hence the conversion efficiency η of the half-bridge inverter. The analysis results shows that the control ranges of ac output power P<inf>0</inf> and dc input power P<inf>d</inf> are limited by the occurrence of NON-ZVS operating condition, which changes according to the switching frequency f<inf>s</inf>. © 2007 IEEE.
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Analysis of transition mode from phase shift to zero-phase shift under ZVS and NON-ZVS operation for induction heating inverter
(2007-10-01)
Viriya, P.
;
Yongyuth, N.
;
Matsuse, K.
This paper proposes an analysis of transition mode from phase shift to zero-phase shift under ZVS and NON-ZVS operation for a series resonant inverter with the load of induction heating. A number of circuit operation during transition mode from phase shift to zero-phase shift under ZVS and NON-ZVS conditions are first analyzed. Various voltage and current equations of the operating circuits are then obtained and used for calculation of the waveforms by the aid of MATLAB program. The calculated waveforms make possible the consideration of some important circuit parameters that are used to determine ZVS or NON-ZVS conditions. The theoretical results and proposed method are also verified by experimental ones, using a prototype test set in our laboratory. © 2007 IEEE.
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Analysis of high-frequency induction cooker with variable frequency power control
(2002-01-01)
Viriya, P.
;
Sittichok, S.
;
Matsuse, K.
This paper presents an analysis of a high frequency induction cooker, using a half-bridge series resonant inverter. The circuit operation is first analyzed, using the Thevenin short-open circuit method, in order to develop an equivalent circuit of simple RLC series connection. Then, by this simplified circuit, voltage and current equations with their spectra can be easily obtained and consequently leading to the calculation of various electrical quantities, which are also verified by experiment, using a prototype cooker of 2 kW 30 kHz with variable power and variable frequency. This cooker also shows that at the same power level of 1.5 kW, its boiling performance is faster than that of the conventional one, 5 and 10 minutes, respectively.
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CHARACTERISTICS OF A NEW PWM-CONTROLLED GTO THREE-PHASE CONVERTER.
(1985-12-01)
Viriya, P.
;
Kubota, H.
;
Matsuse, K.
The characteristics of a new PWM-controlled GTO three-phase converter are described. An auxiliary circuit consisting of GTO thyristors was newly developed to treat the commutating energy generated in ac source leakage reactance during circuit commutation to maintain high efficiency. Various characteristics of the auxiliary circuit, snubber capacitor and the new converter circuit are investigated. The harmonic distribution curves from this PWM-Controlled method over a wide control range of modulation factor are calculated and compared with conventional ones. The new converter has high efficiency and low harmonic content. An auxiliary capacitor makes the snubber capacitor smaller and its voltage is used to limit voltage spikes generated in the ac source by controlling the conducting state of the GTO's in the auxiliary circuit.
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