Hidekazu Yamashita

Induction-heated cooking appliance using new quasi-resonant ZVS-PWM inverter with power factor correction

This paper presents a new prototype of a voltage-fed quasi-load resonant inverter with a constant-frequency variable-power (CFVP) regulation scheme, which is developed for the next-generation high-frequency high-power induction-heated (IH) cooking appliances in household applications. This application-specific high-frequency single-ended push-pull inverter using new-generation specially designed insulated gate bipolar transistors (IGBTs) can efficiently operate under a principle of zero-voltage switching pulsewidth modulation (ZVS-PWM) strategy. This low-cost soft-switching inverter using reverse-conducting and reverse-blocking IGBTs is more suitable for multiple-burner-type induction-heating cooking appliances. The operating principle and unique features of a new resonant ZVS-PWM inverter circuit topology is originally described, together with its steady-state power regulation characteristics, which are illustrated on the basis of its computer-aided simulation and experimental results. The ZVS operation condition on power regulation, loss analysis of new IGBTs incorporated into this inverter, and its active filtering performance are discussed for IH cooking appliances.

A novel type induction-heating single-ended resonant inverter using new bipolar Darlington-Transistor

Demonstrated is a novel type of single-ended resonant inverter using a new Bipolar Darlington-Transistor that operates efficiently in the frequency range of 20kHz to about 50kHz. The inverter implementation for an induction-heating range includes a unique power control strategy. The analysis and performance evaluations for circuit design are carried out herein.

High frequency soft switching inverter for fluid-heating appliance using induction eddy current-based involuted type heat exchanger

This paper presents a high efficiency and high performance continuous fluid-heating appliance in the pipeline system using soft switching high frequency inverter which is base on the electromagnetic induction heating processing. Its operating performance as a hot water producer is evaluated and discussed on the basis of experimental and simulation results.

Direct high frequency soft switching inverter type AC-DC power converter with boost function for consumer magnetron drive

The oscillation voltage (Ebm) is an important parameter of the characteristic constant of a high power microwave generator. When Ebm could be made high, it serves so as to improve the power conversion efficiency of a magnetron. Thus, the newly developed magnetron with 7% higher oscillation cut-off voltage than the present conventional one is manufactured by Matsushita Electric Industrial Co.Ltd, In addition to this, the utility AC power line current reduced harmonic type direct inverter AC-DC power converter suitable and acceptable for driving this magnetron is proposed in this paper. This direct high frequency inverter type soft switching PWM AC-DC converter has the voltage-boost function based on active clamp scheme with soft switching pulse modulation strategy topology. This paper describes a novel type active clamp AC-DC power converter circuit defined as direct high frequency inverter and the switching operation of this power converter is described and discussed on the basis of simulation and experimental results. The operating characteristics of this soft switching direct high frequency inverter type AC-DC power converter using IGBTs that incorporates the harmonic current improvement as well as power factor correction are evaluated and discussed from a practical point of view as compared with the conventional AC-DC power converter.The oscillation voltage (Ebm) is an important parameter of the characteristic constant of a high power microwave generator. When Ebm could be made high, it serves to improve the power conversion efficiency of a magnetron. The newly developed magnetron has 7% higher oscillation cut-off voltage than the present conventional one and is manufactured by Matsushita Electric Industrial Co.Ltd. In addition to this, the utility AC power line current reduced harmonic type direct inverter AC-DC power converter suitable and acceptable for driving this magnetron is proposed in this paper. This direct high frequency inverter type soft switching PWM AC-DC converter has the voltage-boost function based on active clamp scheme with soft switching pulse modulation strategy topology. This paper describes a novel type active clamp AC-DC power converter circuit defined as direct high frequency inverter and the switching operation of this power converter is described and discussed on the basis of simulation and experimental results. The operating characteristics of this soft switching direct high frequency inverter type AC-DC power converter using IGBTs that incorporates the harmonic current improvement as well as power factor correction are evaluated and discussed from a practical point of view as compared with the conventional AC-DC power converter.

Hierarchical proximity effect correction for e-beam direct writing of 64-Mbit DRAM

A high-speed proximity effect correction system with two-level cell hierarchy processing has been developed to realize an accuracy-assuring electron beam (EB) direct-writing for high density VLSI. The system has two distinct advantages. First, a new hierarchial zoning algorithm is introduced to realize a data compaction for the total pattern transactions. Zone data or assemblies or patterns to be proximity-corrected are created by the zoning procedure. Frame region is associated with each zone in order to incorporate the effect of back-scattered electrons into the zone data. Second, a fast iterative technique is introduced for the proximity effect correction calculation based on a dos modulation method. A double Gaussian proximity function is used for describing the electron scattering. The present correction system was applied to 64 Mbit DRAM pattern with a 0.4 micrometers design rule. The total correction processing for the layer with maximum data volume was completed within four hours in CPU time. The patterns after delineation and development were successfully obtained by combining the present proximity effect correction with tri-layer resist process.

Load resonant and quasiresonant hybrid mode ZVS-PWM high frequency inverter for induction heated foam metal fluid heater

This paper presents a novel prototype of phase shift ZVS-PWM controlled high frequency load resonant inverter with loss less capacitor snubbers in addition to active resonant snubber for electromagnetic induction fluid heating appliances. The operating principle and unique features of this soft switching high frequency inverter circuit are described herein. The constant frequency phase shift ZVS-PWM controlled voltage source type high frequency load resonant inverter employing IGBTs is proposed for series capacitor compensated load, which is capable of achieving stable and efficient zero voltage soft commutation over a widely specified power regulation range from full power to low power. The steady state operating performance of this high frequency inverter is evaluated and discussed on the basis of simulation and experimental results for newly developed induction heated dual-pack heater of compact moving fluid heating appliance in the pipeline.