Serguei Moisseev

Tapped-inductor filter assisted soft-switching PWM DC-DC power converter

A novel high-frequency transformer linked full-bridge type soft-switching phase-shift pulsewidth modulated (PWM) controlled dc-dc power converter is presented, which can be used as a power conditioner for small-scale photovoltaic and fuel cell power generation systems as well as isolated boost dc-dc power converter for automotive ac power supply. In these applications with low-voltage large-current sources, the full-bridge circuit is the most attractive topology due to the possibility of using low-voltage high-performance metal-oxide-semiconductor field-effect transistor (MOSFET) and achieving high efficiency of the dc-dc power converter. A tapped-inductor filter including the freewheeling diode is newly implemented in the output stage of the full-bridge phase-shift PWM dc-dc converter to achieve soft-switching operation for the wide load variation range. Moreover, in the proposed converter circuit, the circulating current is effectively minimized without using additional resonant circuit and auxiliary power switching devices. The practical effectiveness of the proposed soft-switching dc-dc power converter was verified in laboratory level experiment with 1 kW 100 kHz breadboard setup using power MOSFETs. Actual efficiency of 94-97% was obtained for the wide duty cycle and load variation ranges.

Full bridge soft-switching phase-shifted PWM DC-DC converter using tapped inductor filter

In this paper, a novel high frequency transformer linked full-bridge type soft-switching phase-shift PWM control scheme DC-DC power converter is presented. A tapped inductor filter is implemented in the proposed soft-switching converter topology to achieve wide load variation range soft-switching PWM constant frequency operation of the DC-DC converter, to minimize circulating current. The presented converter operates with ZVS for leading bridge leg active power switches due to lossless snubber capacitors, and ZCS for lagging bridge leg active power switches with the aid of the high frequency transformer parasitic leakage inductance component and tapped inductor filter. The effectiveness of the proposed soft-switching DC-DC converter is verified in experiment with 2 kW 100 kHz breadboard setup using IGBTs. Actual efficiency of 94% is obtained for the wide load variation range.

Pulse width and pulse frequency modulation pattern controlled ZVS inverter type AC-DC power converter with lowered utility AC grid side harmonic current components for magnetron drive

The grid voltage of commercial utility power source in Japan and USA is 100 V, but in China and European countries, it is 200 V. In recent years, in Japan, 200 V output single-phase three-wire power systems have begun to be used for high power applications. In 100 V utility AC power applications and systems, an active voltage clamped quasi-resonant inverter circuit topology using IGBTs has been effectively used so far for the consumer microwave oven. In this paper, the authors present a half bridge type voltage-clamped high-frequency inverter type AC-DC power converter using which is designed for consumer magnetron drives used in consumer microwave ovens on 200 V utility AC power systems. This zero voltage soft switching inverter can use the same power rated switching semiconductor devices and three-winding high frequency transformer as those of the active voltage clamped quasi-resonant inverter using the IGBTs that has already been used for 100 V utility AC power sources. The operating performances of the voltage source single ended push pull type inverter are evaluated and discussed for a consumer microwave oven. The harmonic line current components in the utility AC power side of the AC-DC power converter operating at ZVS-PWM strategy were reduced and improved upon the basis of sine wave like pulse frequency modulation and sine wave like pulse width modulation for the utility AC voltage source.

Boost transformer linked full bridge soft-commutation DC-DC power converter with secondary-side phase-shifted PWM rectifier switches

This paper presents a novel circuit topology of a voltage source type zero voltage soft-switching full bridge inverter DC-DC power converter with an isolated high-frequency transformer link this power converter incorporates zero-current soft-switching (ZCS) mode phase-shifted PWM active power switches in series with diode into two diode arms of full-bridge rectifier or center-tapped rectifier in transformer secondary-side. This isolated DC-DC power converter circuit can achieve ZVS/ZVT transition commutation for non-controlled active power switches in the primary side of transformer and ZCS/ZCT transition commutation for phase-shifted PWM active power switches in the secondary side of transformer, which can operate under wide load variations from a light load to a heavy load as well as a condition of PWM voltage regulation strategy.

Transformer parasitic parameters and lossless inductive snubber assisted zero current soft switching DC-DC converter for high power magnetron drive

This paper presents a novel prototype of a high-frequency transformer parasitic parameter and a lossless inductive snubber assisted series-resonant ZCS-PFM DC-DC power converter, which is designed for high power magnetron. When a conventional series-resonant PFM DC-DC converter is designed for magnetron drive, it is very difficult to implement zero current soft switching commutation due to the influence of the magnetizing current through a high-frequency transformer. In order to implement soft switching commutation, the new topology that can actively utilize the magnetizing current is proposed and discussed on the basis of simulation and experimental results.

Practical performance evaluations on an improved circuit topology of active three-phase PFC power converter

This paper presents an operating principle in steady state and unique features of a new prototype topology of a utility interactive three-phase active PFC power converter circuit. Its harmonic components of utility-gridside line current and PFC performances are evaluated and discussed on the basis of the experimental and simulation results as compared with the other conventional types of three-phase PFC converters.

Tapped inductor filter-assisted soft-switching PWM DC-DC power converter with high frequency transformer link for automotive AC power supply

This paper presents a novel voltage source full-bridge type soft-switching phase-shift PWM controlled DC-DC power converter with a high frequency transformer link, which can operate under ZVS transition of leading bridge leg and ZCS transition of lagging bridge leg. This power converter can be used as power conditioner for small-scale solar photovoltaic cell and fuel cell power generation systems and isolated step-up DC-DC power converter for automotive AC power supply. The full-bridge circuit topology with a high frequency step-up transformer makes possible to apply low voltage high performance MOSFETs in order to achieve high efficiency processing of the DC-DC power conversion. The tapped inductor filter including a freewheeling diode is implemented in the output stage of the proposed soft-switching DC-DC power converter to perform soft-switching phase-shift PWM high frequency operation for wide load variation ranges. Moreover, in the proposed DC-DC power converter circuit, the circulating currents are effectively minimized without adding active auxiliary quasi-resonant snubber circuit with power switching devices. The practical effectiveness of the proposed soft-switching DC-DC power converter is verified on the basis of experimental setup.

Duplex two switch forward transformers linked soft-switching high frequency PWM DC-DC converter with tapped inductor filters

This paper presents a novel circuit topology of a duplex two-switch forward transformer type zero-voltage and zero-current soft switching (ZVZCS) high frequency DC-DC power converter with PWM control scheme. Based on the conventional paralleled two-switch forward transformer link hard switching converter this circuit configuration does not include complex auxiliary resonant circuit except for an output side tapped-inductor smoothing filter. This new DC-DC converter has advantages as wide soft-switching operation range under broad load variations and PWM regulations, lowered level of the idle and circulating currents through circuit components, small ripple output voltage. The basic operating principle of the converter is illustrated by equivalent circuit for each mode with detailed explanation. Moreover, the feasible practical effectiveness of the proposed soft-switching DC-DC power converter realized on the 500 W 100 kHz breadboard setup is verified and evaluated on basis of simulation and experimental results.

Feasibility study of high frequency step-up transformer linked soft-switching PWM DC-DC converter with tapped inductor filter

This paper presents a novel high frequency transformer linked full-bridge type soft-switching phase-shift PWM control DC-DC power converter, which can be used as DC power conditioner for small-scale fuel cell power generation system as well as isolated step-up DC-DC power converter for automotive AC power supply. Using full-bridge soft-switching PWM DC-DC converter topology makes possible to use low voltage high performance MOSFETs to achieve high efficiency of the DC power conditioner. The tapped inductor filter is implemented in the proposed soft-switching converter circuit topology to achieve soft-switching PWM constant high frequency operation for the wide load variation range, to minimize circulating and idling currents without using additional resonant circuit and auxiliary power switching devices. The practical effectiveness of the proposed soft-switching DC-DC power converter is verified in the laboratory level experiment with 1 kW 100 kHz breadboard setup using power MOSFETs. Actual efficiency 94-96% of the proposed DC-DC converter is obtained for the wide load range.

Practical Design Considerations for High-Frequency Soft-Switching PWM DC-DC Power Converter with Tapped Inductor Filter

In this paper, practical design considerations for the novel prototype of the high frequency transformer link full-bridge type soft-switching phase-shift PWM controlled DC-DC power converter with ZVS and ZCS bridge legs using tapped inductor filter are presented. The proposed tapped inductor filter assisted phase-shift PWM DC-DC converter can achieve constant frequency soft-switching operation under conditions of the wide load range and input voltage variations and to minimize circulating current, which occurs due to presence of the leakage inductance of the high frequency transformer. The optimum practical design of the tapped inductor turns ratio is significant to effectively reduce circulating current and achieve high efficiency of the DC-DC power conversion under 100kHz high frequency operation. The 1kW-100kHz with 36V input DC source and 100V output side breadboard circuit using the power MOSFETS is built and tested. The actual efficiency 97% is obtained at maximum. キ ー ワー ド: フル ブ リッジDC-DCコ ンバ ー タ, 高周 波 絶縁 トラン ス, 位相 シフ トPWM制 御, ソフ トス イ ッチ ン グ, タ ップ付 イ ン ダク タ形 フ ィル タ, 車 載用AC電 源