A Novel Driving Scheme for Synchronous Rectifiers in <i>LLC</i> Resonant Converters

Fu, Dianbo; Liu, Ya; Lee, F.C.; Xu, Ming

doi:10.1109/tpel.2009.2012500

Cited by 277 publications

(81 citation statements)

References 24 publications

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“…The conduction loss, turn-off switching loss, power consumption of the control circuit, inductor loss, and transformer loss degrade the power efficiency of the LLC resonant converter [15], [16]. Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%

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

Kim¹,

Kim²,

Lee³

2012

Journal of Power Electronics

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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 μm Bipolar-CMOS-DMOS (BCD) technology, and the die size is 2.5 mm × 2.5 mm. 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.

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Section: Measurement Resultsmentioning

confidence: 99%

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

Kim¹,

Kim²,

Lee³

2012

Journal of Power Electronics

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“…Thus, it is very difficult to design a ZVS three-level converter with a wide range of load conditions. Recently, resonant converters [14]- [16] have received a lot of attention due to their essential advantages in terms of a high conversion efficiency and a wide ZVS range of the load condition. If the switching frequency is less than the series resonant frequency, the rectifier diodes at the secondary side are operated under zero current switching (ZCS) and the power switches are operated under ZVS turn-on.…”

Section: Introductionmentioning

confidence: 99%

A ZVS Resonant Converter with Balanced Flying Capacitors

Lin¹,

Chen²

2015

Journal of Power Electronics

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This paper presents a new resonant converter to achieve the soft switching of power devices. Two full-bridge converters are connected in series to clamp the voltage stress of power switches at V in /2. Thus, power MOSFETs with a 500V voltage rating can be used for 800V input voltage applications. Two flying capacitors are connected on the AC side of the two full-bridge converters to automatically balance the two split input capacitor voltages in every switching cycle. Two resonant tanks are used in the proposed converter to share the load current and to reduce the current stress of the passive and active components. If the switching frequency is less than the series resonant frequency of the resonant tanks, the power MOSFETs can be turned on under zero voltage switching, and the rectifier diodes can be turned off under zero current switching. The switching losses on the power MOSFETs are reduced and the reverse recovery loss is improved. Experiments with a 1.5kW prototype are provided to demonstrate the performance of the proposed converter.

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“…However, the ZVS condition of active switches is related to the load condition and input voltage so that it is difficult to implement ZVS turn-on for all switches over the entire load range. In order to extend the ZVS condition over the whole load range, resonant converters [18][19][20][21][22] have been proposed to achieve ZVS turn-on over the wide load range and input voltage variation. However, the ripple current at the output capacitor in resonant converter is higher than the output ripple current in the conventional half-bridge or full-bridge PWM converter.…”

Section: Introductionmentioning

confidence: 99%

Analysis of an Interleaved Resonant Converter for High Voltage and High Current Applications

Lin¹,

Chen²

2014

Journal of Electrical Engineering and Technology

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-This paper presents an interleaved resonant converter to reduce the voltage stress of power MOSFETs and achieve high circuit efficiency. Two half-bridge converters are connected in series at high voltage side to limit MOSFETs at V in /2 voltage stress. Flying capacitor is used between two series half-bridge converters to balance two input capacitor voltages in each switching cycle. Variable switching frequency scheme is used to control the output voltage. The resonant circuit is operated at the inductive load. Thus, the input current of the resonant circuit is lagging to the fundamental input voltage. Power MOSFETs can be turn on under zero voltage switching. Two resonant circuits are connected in parallel to reduce the current stress of transformer windings and rectifier diodes at low voltage side. Interleaved pulse-width modulation is adopted to decrease the output ripple current. Finally, experiments are presented to demonstrate the performance of the proposed converter.

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A Novel Driving Scheme for Synchronous Rectifiers in LLC Resonant Converters

Cited by 277 publications

References 24 publications

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

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

A ZVS Resonant Converter with Balanced Flying Capacitors

Analysis of an Interleaved Resonant Converter for High Voltage and High Current Applications

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