• Title, Summary, Keyword: LLC resonant controller

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Design of Control System for LLC Resonant Converter (LLC 공진형 컨버터 제어시스템 설계)

  • Kim, Eui-Hyun;Ahn, Hyun-Sik
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.17 no.1
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    • pp.129-137
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    • 2017
  • In this paper, we propose a digital controller design methodology for an LLC resonant converter which has been widely used due to the advantages of low switching loss and high efficiency. We establish a mathematical model of an LLC resonant converter using the extended describing function concept and propose a controller design method based on the Ziegler Nichols control parameter tuning criteria. The voltage controller of an LLC resonant converter is designed based on the derived small signal model and the performance of the controller is verified by MATLAB simulations. The validity and the control performance of the designed voltage controller for the LLC resonant converter is analyzed through some simulations for the case of load variations and circuit modeling errors.

Adaptive Current Control of Power LEDs Using Half-Bridge LLC Resonant Converter (Half Bridge LLC 공진 컨버터를 이용한 파워 LED의 정전류 적응제어기)

  • Kim, Yeung-Suk;Kim, Young-Tae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.4
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    • pp.48-53
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    • 2013
  • In general, the LLC resonant topology consists of three stages as; square wave generator, resonant network, and rectifier network. LLC resonant converter has the time slowly varying parameters. However, the power LEDs as the load of LLC converter can be regarded as fast time varying parameters. In this paper, the mathematical model of half-bridge resonant converter including with the power LEDs is introduced for the current controller design model. Using this controller design model, the parameter adaptive output feedback controller will be designed to control the power LEDs current. In order to show the validities of the proposed model, the parameter adaptive output feedback controller, the experimental investigation will be presented.

A Study on 120Hz Output Voltage Ripple Reduction of LLC Converter using Resonant Controller (공진 제어기를 이용한 LLC 컨버터의 출력전압 120Hz 맥동저감에 관한 연구)

  • So, Byong-Chul;Lee, Sang-Ri;Kim, Hag-Wone;Cho, Kwan-Yuhl;Hwang, Soon-Sang;Choi, Eun-Seok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.4
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    • pp.345-352
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    • 2012
  • This paper proposes a new method to reduce 120Hz output voltage ripple of LLC converter using resonant voltage controller. This method can reduce the 120Hz output voltage ripple with very high gain at this frequency by the resonant controller with previous PI voltage controller. The reason why the voltage ripple can be reduced is explained by the Bode diagram comparing with the previous PI controller. The simulation with Matlab/Simulink is carried out for this resonant controller and the simulation results show that resonant controller can reduce the 120Hz output voltage ripple. Experiments with DSP controller also carried out and the experimental results also show that the usefulness of the proposed voltage controller.

Harmonic Suppression of the Input Current in Microwave Oven Using LLC Resonant Inverter (전자레인지용 LLC 공진형 인버터의 입력전류 고조파 억제)

  • Kang, Kyelyong;Kim, Heung-Geun;Cha, Honnyong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.3
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    • pp.225-230
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    • 2018
  • This paper proposes a parametric design of an LLC resonant inverter used for a microwave oven. To improve the harmonic performance of the microwave oven, a current controller with a variable PI gain is proposed. Due to the recent strengthening of harmonics regulations, inverter control technology for microwave ovens is now required to satisfy harmonic performance. In an LLC resonant inverter, the voltage gain varies remarkably depending on the magnetron voltage, output power, and input voltage. To satisfy harmonic performance, a controller that can maintain operation in the zero-voltage switching (ZVS) region and control changes in voltage gain is required. The modified design of the LLC resonant inverter ensures ZVS operation even when the magnetron is heated. Application of the variable current controller improves harmonic control according to the instantaneous gain curve change. The validity of the proposed power control with a variable current controller is verified by experiments with a 1200 W microwave oven.

A Design of LLC Resonant Controller IC in 0.35 um 2P3M BCD Process (0.35 um 2P3M BCD 공정을 이용한 LLC 공진 제어 IC 설계)

  • Cho, Hoo-Hyun;Hong, Seong-Wha;Han, Dae-Hoon;Cheon, Jeong-In;Hur, Jeong;Lee, Kang-Yoon
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.5
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    • pp.71-79
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    • 2010
  • This paper presents a design of a LLC resonant controller IC. LLC resonant controller IC controls the voltage of the 2nd side by adjusting frequency the input frequency of the external resonant circuit. The clock generator is integrated to provide the pulse to the resonant circuit and its frequency is controlled by the external resistor. Also, the frequency of the VCO is adjusted by the feedback voltage. The protection circuits such as UVLO(Under Voltage Lock Out), brown out, fault detector are implemented for the reliable and stable operation. The HVG, and LVG drivers can provide the high current and voltage to the IGBT. The designed LLC resonant controller IC is fabricated with the 0.35 um 2P3M BCD process. The overall die size is $1400um{\times}1450um$, and supply voltage is 5V, 15V.

A Dual-Output Integrated LLC Resonant Controller and LED Driver IC with PLL-Based Automatic Duty Control

  • Kim, HongJin;Kim, SoYoung;Lee, Kang-Yoon
    • Journal of Power Electronics
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    • v.12 no.6
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    • pp.886-894
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    • 2012
  • This paper presents a secondary-side, dual-mode feedback LLC resonant controller IC with dynamic PWM dimming for LED backlight units. In order to reduce the cost, master and slave outputs can be generated simultaneously with a single LLC resonant core based on dual-mode feedback topologies. Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) schemes are used for the master stage and slave stage, respectively. In order to guarantee the correct dual feedback operation, Phased-Locked Loop (PLL)-based automatic duty control circuit is proposed in this paper. The chip is fabricated using $0.35{\mu}m$ Bipolar-CMOS-DMOS (BCD) technology, and the die size is $2.5mm{\times}2.5mm$. The frequency of the gate driver (GDA/GDB) in the clock generator ranges from 50 to 425 kHz. The current consumption of the LLC resonant controller IC is 40 mA for a 100 kHz operation frequency using a 15 V supply. The duty ratio of the slave stage can be controlled from 40% to 60% independent of the frequency of the master stage.

PWM/PFM Dual Mode SMPS Controller IC for Active Forward Clamp and LLC Resonant Converters

  • Cheon, Jeong-In;Ha, Chang-Woo
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.7 no.2
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    • pp.94-97
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    • 2007
  • The desin and implementation of a CMOS analog integrated circuit that provides dual-mode modulations, PWM for active clamp reset converter and PFM for LLC resonant converter, is described. The proposed controller is capable of implementing programmable soft start and current-mode control with compensating ramp for PWM and frequency shifting soft start for PFM. Also it provides delay time for both modes. PWM mode is implemented by active clamp reset converter and PFM mode is implemented by LLC resonant convereter, respectively. The chip is fabricated using the 0.6um high voltage CMOS process.

A Wide Frequency Range LLC Resonant Controller IC with a Phase-Domain Resonance Deviation Prevention Circuit for LED Backlight Units

  • Park, YoungJun;Kim, Hongjin;Chun, Joo-Young;Lee, JooYoung;Pu, YoungGun;Lee, Kang-Yoon
    • Journal of Power Electronics
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    • v.15 no.4
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    • pp.861-875
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    • 2015
  • This paper presents a wide frequency range LLC resonant controller IC for LED backlight units. In this paper a new phase-domain resonance deviation prevention circuit (RDPC), which covers a wide frequency and input voltage range, is proposed. In addition, a wide range gate clock generator and an automatic dead time generator are proposed. The chip is fabricated using 0.35 μm BCD technology. The die size is 2 x 2 mm2. The frequency of the clock generator ranges from 38 kHz to 400 kHz, and the dead time ranges from 300 ns to 2 μs. The current consumption of the LLC resonant controller IC is 4 mA for a 100 kHz operation frequency using a supply voltage of 15 V.

Digital Power Control of LLC Resonant Inverter for Microwave Oven (전자레인지용 LLC 공진형 인버터의 디지털 출력 제어)

  • Kang, Kyelyong;Kim, Heung-Geun;Cha, Honnyong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.5
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    • pp.457-462
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    • 2017
  • This paper proposes a digital power control of the LLC resonant half-bridge inverter for high power microwave oven application. Conventional half-bridge inverter for driving a microwave oven uses a hardware-based power control method which varies the frequency according to the AC source voltage. In this case, it is difficult to control the output power according to the variation of the load status of magnetron. The proposed power control consists of an instantaneous current generator and a current controller. Instantaneous current generator makes an instantaneous current reference from power command using input voltage information. Current controller controls input current which has an information of status of magnetron. The proposed power control does not require any compensation algorithm for the change of the load status of the magnetron and change of input voltage. The validity of the proposed method for the control of the change of input voltage and frequency is verified by both simulation and experiment.

A High Efficiency Controller IC for LLC Resonant Converter in 0.35 μm BCD

  • Hong, Seong-Wha;Kim, Hong-Jin;Park, Hyung-Gu;Park, Joon-Sung;Pu, Young-Gun;Lee, Kang-Yoon
    • Journal of Power Electronics
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    • v.11 no.3
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    • pp.271-278
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    • 2011
  • This paper presents a LLC resonant controller IC for secondary side control without external active devices to achieve low profile and low cost LED back light units. A gate driving transformer is adopted to isolate the primary side and the secondary side instead of an opto-coupler. A new integrated dimming circuitry is proposed to improve the dynamic current control characteristic and the current density of a LED for the brightness modulation of a large screen LCD. A dual-slope clock generator is proposed to overcome the frequency error due to the under shoot in conventional approaches. This chip is fabricated using 0.35 ${\mu}m$ BCD technology and the die size is $2{\times}2\;mm^2$. The frequency range of the clock generator is from 50 kHz to 500 kHz and the range of the dead time is from 50 ns to 2.2 ${\mu}s$. The efficiency of the LED driving circuit is 97 % and the current consumption is 40 mA for a 100 kHz operation frequency from a 15 V supply voltage.