• Title/Summary/Keyword: Average Current Mode

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Average Current Mode Control for LLC Series Resonant DC-to-DC Converters

  • Park, Chang Hee;Cho, Sung Ho;Jang, Jinhaeng;Pidaparthy, Syam Kumar;Ahn, Taeyoung;Choi, Byungcho
    • Journal of Power Electronics
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    • v.14 no.1
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    • pp.40-47
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    • 2014
  • An average current mode control scheme that consistently offers good dynamic performance for LLC series resonant DC-to-DC converters irrespective of the changes in the operational conditions is presented in this paper. The proposed control scheme employs current feedback from the resonant tank circuit through an integrator-type compensation amplifier to improve the dynamic performance and enhance the noise immunity and reliability of the feedback controller. Design guidelines are provided for both current feedback and voltage feedback compensation. The performance of the new control scheme is demonstrated through an experimental 150 W converter operating with 340 V to 390 V input voltage to provide a 24 V output voltage.

A Study on the Average Current-Mode Control AC/DC ZVT-Boost Converter with Active-Clamp Method (능동 클램프 방식을 이용한 AC/DC ZVT 승압형 컨버터의 평균전류모드 제어에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Kim, Pill-Soo;Lim, Nam-Hyuk;Yoon, Suk-Ho;Chang, Sung-Won
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1005-1008
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    • 2001
  • This paper presents average current-mode control AC/DC ZVT(Zero Voltage Transition) Boost Converter. This boost converter perceives feed forward signal of input and feedback signal of output for average current-mode control proposed converter employs active-clamp method for ZVT. This converter gives the good PFC(Power Factor Correction), low line current hormonic distortions and tight output voltage regulations. This converter also has a high efficiency by active-clamp method. The principle of operation, feature, and design considerations are illustrated and verified through the experiment with a 150W, 120kHz prototype converter.

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Small Signal Modeling of Current Mode Control (전류모드 제어의 소신호 모델링)

  • 정영석;강정일;최현칠;윤명중
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.4
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    • pp.338-345
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    • 1998
  • The mathematical interpretation of a practical sampler which is useful to obtain the small signal models for the peak and average current mode controls is proposed. Due to the difficulties in applying the Shannons sampling theorem to the analysis of sampling effects embedded in the current mode control, several different approaches have been reported. However, these approaches require the information of the inductor current in a discrete expression, which restricts the application of the reported method only to the peak current mode control. In this paper, the mathematical expressions of sampling effects on a current loop which can directly apply the Shannons sampling theorem are newly proposed, and applied to the modeling of the peak current mode control. By the newly derived models of a practial smapler, the models in a discrete time domain and a continuous time domain are obtained. It is expected that the derived models are useful for the control loop design of power supplies. The effectiveness of the derived models are verified through the simulation and experimental results.

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Analysis of Interleaved Boost Power Factor Corrector (Interleaved 승압형 역률보상 컨버터의 해석)

  • Heo, Tae-Won;Park, Jee-Ho;Roh, Tae-Kyun;Chung, Jae-Lyoun;Kim, Dong-Wan;Woo, Jung-In
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.51 no.4
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    • pp.186-192
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    • 2002
  • In this paper, interleaved boost power factor corrector(IBPFC) is applied as a pre-regulator in switch mode power supply. IBPFC can reduce input current ripple and effectively increase the switching frequency without increasing the switching losses, because input current is divided each 50% by two switching devices. IBPFC can be classified as three cases by duty ratio condition in continuous current mode and be carried out state space average modeling. According to the modeling, steady and transient state analysis is performed by steady elements and perturbation element. Control transfer function is derived for design of control system.

The Average Current Mode Control of Zero Current Switched Series Resonant Converter (영전류 스위칭 직렬공진형 컨버터의 평균전류모드제어)

  • Jung, Young-Seok;Moon, Gun-Woo;Youn, Myung-Joong
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.539-541
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    • 1994
  • The average current mode control of zero current switched series resonant converter is proposed. The conventional current controllers such as bang bang current controller and predictive current cantroller have some demerits like current offset and complexity. In this paper, the proposed current control technique are conventional current control techniques are comparatively studied. By the proposed control technique. the current cantroller can be simplely implemented without current offset.

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Modeling of a Converter Utilizing Current Mode Control (전류모드제어 방식을 이용하는 컨버터의 모델링)

  • 정영석;이준영;강정일;윤명중
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.275-278
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    • 1998
  • The mathematical interpretation of a practical sampler which is useful to obtain the small signal models for the peak and average current mode controls is proposed. Due to the difficulties in applying the Shannon's sampling theorem to the analysis of sampling effects embedded in the current mode control, several different approaches have been reported. However, these approaches require the information of the inductor current in a discrete expression, which restricts the application of the reported method only to the peak current mode control. In this paper, the mathematical expressions of sampling effects on a current loop which can directly apply the Shannon's sampling theorem are newly proposed, and applied to the modeling of the peak current mode control. By the newly derived models of a practical sampler, the models in a discrete time domain and a continuous time domain are obtained. It is expected that the derived models are useful for the control loop design of power supplies. The effectiveness of the derived models are verified through the simulation and experimental results.

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Digital Control of a Power Factor Correction Boost Rectifier Using Diode Current Sensing Technique

  • Shin, Jong-Won;Hyeon, Byeong-Cheol;Cho, Bo-Hyung
    • Journal of Power Electronics
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    • v.9 no.6
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    • pp.903-910
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    • 2009
  • In this paper, a digital average current mode control using diode current sensing technique is proposed. Although the conventional inductor current sensing technique is widely used, the sensed signal of the current is negative. As a result, it requires an additional circuit to be applied to general digital controller ICs. The proposed diode current sensing method not only minimizes the peripheral circuit around the digital IC but also consumes less power to sense current information than the inductor current sensing method. The feasibility of the proposed technique is verified by experiments using a 500W power factor correction (PFC) boost rectifier.

Modeling and Design of Average Current Mode Control (평균전류모드제어를 이용하는 컨버터의 모델링 및 설계)

  • Jung Young-Seok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.4
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    • pp.347-355
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    • 2005
  • In this paper, a new continuous~time small signal model of an average current mode control is proposed. Sampling effect Is considered to obtain the proposed small signal model. By the proposed model, the high frequency response characteristics of current loop gain might be predicted accurately compared to previous models. And this leads the prediction of inductor current response of the proposed model to be accurate compared to others. In order to show the usefulness of the proposed model, prediction results of the proposed model are compared to those of the circuit level simulator, PSIM and experiment.

Discontinuous Conduction Mode Current Control using a Current Gain Feedforward Compensation for Boost Converter (전류게인 전향보상기법을 이용한 부스트 컨버터의 불연속전도 모드 전류제어)

  • Lee, Seung-Goo;Kim, Young-Roc;Cha, Han-Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.11
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    • pp.2049-2055
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    • 2011
  • In this paper a new current control method is proposed for the discontinuous conduction mode of boost converter. The proposed method using a current gain feedforward compensation adjusts a measured inductor current value and then, calculated an average current precisely in the discontinuous conduction mode as well as continuous conduction mode. By applying the proposed method, the current measurement error is significantly reduced to 2% regardless of the operating points. The proposed method is analyzed and its performance is investigated in simulation. To verify the feasibility of the proposed scheme, a 10kW 3-phase interleaved boost converter was built and experimental results are matched to the simulation results.

Sliding Mode Control for Current Distribution Control in Paralleled Positive Output Elementary Super Lift Luo Converters

  • Kumar, Kuppan Ramash;Jeevananthan, Seenithangam
    • Journal of Power Electronics
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    • v.11 no.5
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    • pp.639-654
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    • 2011
  • This paper presents a Current Distribution Control design for Paralleled Positive Output Elementary Super Lift Luo Converters (PPOESLLCs) operated in Continuous Conduction Mode using a Sliding Mode Controller (SMC). Manipulating the higher current requirement of the load through the paralleling of POESLLCs, results in a current inequality. This is mainly due to dissimilarities in the power semiconductor switches and circuit components used in POESLLCs, which may lead to converter failures. In order to balance the proper load current sharing and the load voltage regulation of PPOESLLCs, a SMC is developed. The SMC is designed for the inherently variable-structured of POESLLCs by using the state-space average based model. The static and dynamic performance of the developed controller with PPOESLLCs is validated for its robustness to perform over a wide range of operating conditions through both a laboratory prototype and MatLab/Simulink models, which are compared with a Proportional-Integral (PI) controller. Theoretical analysis, simulation and experimental results are presented to demonstrate the feasibility of the developed SMC along with the complete design procedure.