• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.129-131
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• 2006

This paper presents a new ZVS-PWM high frequency inverter. The ZVS operation is achieved in the whole load range by using a simple auxiliary reverse blocking switch in parallel with series resonant capacitor. The operating principle and the operating characteristics of the new high frequency circuit treated here are illustrated and evaluated on the basis of simulation results. It was examined that the complete soft switching operation can be achieved even for low power setting ranges by introducing the high frequency dual duty cycle control scheme. In the proposed high frequency inverter treated here, the dual mode pulse modulation control strategy of the asymmetrical PWM in the higher power setting ranges and the lower power setting ones, the output power of this high frequency inverter could introduce in order to extend soft switching operation ranges. Dual duty cycle is used to provide a wide range of output power regulation that is important in many high frequency inverter applications. It is more suitable for induction heating applications the operation and control principle of the proposed high frequency inverter are described and verified through simulated results.

• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.271-279
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• 2015

Induction cooking application with multiple loads need high power inverters and appropriate control techniques. This paper proposes an inverter configuration with buck-boost converter for multiple load induction cooking application with independent control of each load. It uses one half-bridge for each load. For a given dc supply of $V_{DC}$, one more $V_{DC}$ is derived using buck-boost converter giving $2V_{DC}$ as the input to each half-bridge inverter. Series resonant loads are connected between the centre point of $2V_{DC}$ and each half-bridge. The output voltage across each load is like that of a full-bridge inverter. In the proposed configuration, half of the output power is supplied to each load directly from the source and remaining half of the output power is supplied to each load through buck-boost converter. With buck-boost converter, each half-bridge inverter output power is increased to a full-bridge inverter output power level. Each half-bridge is operated with constant and same switching frequency with asymmetrical duty cycle (ADC) control technique. By ADC, output power of each load is independently controlled. This configuration also offers reduced component count. The proposed inverter configuration is simulated and experimentally verified with two loads. Simulation and experimental results are in good agreement. This configuration can be extended to multiple loads.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2017년도 추계학술대회
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• pp.111-112
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• 2017

This paper presents a novel three-port converter for the OnBoard Charger of Electric Vehicles by using an impedance control network. The proposed concept is suitable for charging a main battery and an auxiliary battery of an electric vehicle at the same time due to its power handling capability of the converter without additional switches. The power flow is managed by the phase angle (${\Theta}$) between the ports whereas voltage at each port is controlled by the asymmetric duty cycle and the phase shift (${\Phi}$) between the inverter lags controlled by the impedance control network. The proposed system has a capability of achieving zero voltage switching (ZVS) and zero current switching (ZCS) at all the switches over the wide range of input voltage, output voltage and output power. The feasibility of the proposed system is verified by the PSIM simulation.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.173-174
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• 2012

본 논문에서는 전기자동차용 부하 직렬 공진형 컨버터(Series-loaded Resonant Converter, SRC)타입의 탑재형 충전기 (On-Board Charger, OBC)의 추가 회로 없이 경부하 효율을 향상시키기 위한 스위칭 방법들을 비교 분석한다. 시스템에 적용할 스위칭 제어 방법은 Asymmetrical Duty Cycle Control (ADC)과 Asymmetrical Voltage-Cancellation Control (AVC) 방법이다. 각 제어 방법을 기존의 3.3kW SRC-OBC의 적용하여 경부하 영역에서의 효율을 확인하고 각 제어 방법의 타당성을 검증한다.

• 전력전자학회논문지
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• 제14권3호
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• pp.235-242
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• 2009

본 논문에서는 새로운 비대칭 PWM 제어 방식의 양방향 하프브리지 컨버터를 제안한다. 제안한 컨버터는 구조가 간단하고 넓은 듀티 범위를 가지므로 연료전지와 같은 넓은 전압변동을 가지는 응용에 적합하다. 제안한 비대칭 PWM 방식은 기존의 위상각제어 방식에 비해 스위치 및 변압기의 동작전류를 큰 폭으로 낮추었고 ZVZCS와 동기 정류 방식을 적용하여 높은 효율과 전력밀도를 가질 수 있다. 기존 컨버터와의 비교 분석을 수행하였으며 실험을 통해 본 방식의 타당성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.23-24
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• 2012

본 논문에서는 전기자동차용 탑재형 충전기회로 (On-Board Charger, OBC) 에 사용되는 부하 직렬 공진형 컨버터 (Series loaded Resonant DC-DC Converter, SRC) 의 정전압 제어를 위해 기존에 듀티를 고정하고 주파수만을 제어하던 방법에 듀티도 같이 제어하는 비대칭 듀티 제어 방법 (Asymmetrical Duty Cycle Control) 을 적용하였다. 적용한 SRC-OBC의 등가화 모델의 수식적 분석을 통해 제안한 회로의 동작영역을 도출하여 결과로 얻어진 동작영역에서 제안한 회로의 부하에 따른 효율을 기존 주파수 제어 방법과 비교 분석을 통하여 적용한 제어 방법의 타당성을 검증한다.

• Journal of Power Electronics
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• 제6권2호
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• pp.95-103
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• 2006

In this paper, a novel prototype of auxiliary switched capacitor assisted voltage source soft switching PWM Single-Ended Push Pull (SEPP) series capacitor compensated load resonant inverter with two auxiliary edge resonant lossless inductor snubbers is proposed and discussed for small scale consumer high-frequency induction heating (IH) appliances. The operation principle of this inverter is described by using switching mode equivalent circuits. The newly developed multi resonant high-frequency inverter using trench gate IGBTs can regulate its output AC power via constant frequency edge-resonant associated soft switching commutation by using an asymmetrical PWM control or duty cycle control scheme. The brand-new consumer IH products which use the newly proposed edge-resonant soft switching PWM-SEPP type series load resonant high-frequency inverters are evaluated using power regulation characteristics, actual efficiency vs. duty cycle and input power vs. actual efficiency characteristics. Their operating performance compared with some conventional soft switching high-frequency inverters for IH appliances is discussed on the basis of simulation and experimental results. The practical effectiveness of the newly proposed soft switching PWM SEPP series load resonant inverter is verified from an application point of view as being suitable for consumer high-frequency IH appliances.

• 전력전자학회논문지
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• 제8권1호
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• pp.64-69
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• 2003

전류모드 제어시 전류루프에는 표본화 효과에 의해 저주파 모델로는 예측하기 어려운 고주파 성분이 존재한다. 본 논문에서는 영전압 스위칭 하프 브리지 컨버터의 정상상태에서의 출력전압 관계식을 구한다 또 이를 바탕으로 전류모드로 제어할 때 전류루프에 존재하는 표본화 효과를 고려하여 저주파 소신호 모델이 예측하기 어려운 고주파 성분의 특성을 표본화 이득을 통하여 더욱 정확히 예측할 수 있는 방법을 제시한다.

• Journal of Power Electronics
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• 제7권2호
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• pp.124-131
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• 2007

In this paper, a novel type of auxiliary switched capacitor assisted edge resonant soft switching PWM resonant DC-DC converter with two simple auxiliary commutation lossless inductor snubbers is presented. The operation principle of this converter is described using the switching mode equivalent circuits. This newly developed multi resonant DC-DC converter can regulate its DC output AC power under a principle of constant frequency edge-resonant soft switching commutation by an asymmetrical PWM duty cycle control scheme. The high frequency power regulation and actual power characteristics of the proposed soft switching PWM resonant DC-DC converter are evaluated and discussed. The operating performances of the newly proposed soft switching inverter are represented based on simulation results from an applications point of view.