Current Detection and Control of Synchronous Rectifier in High-Frequency <i>LLC</i> Resonant Converter

Wang, Kangping; Guo, Wei; Wei, Jiwen; Wu, Jianpeng; Wang, Laili; Yang, Xu

doi:10.1109/tpel.2021.3119770

Cited by 19 publications

(11 citation statements)

References 9 publications

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“…where X s is the equivalent inductive reactance of the resonant tank composed of L s , L p , and C s , given by (10); n is the harmonic order; I s is the amplitude of the input current calculated from (11); and α is the phase angle of the input current obtained from (12).…”

Section: Equivalent Modelmentioning

confidence: 99%

“…9 When galvanic isolation is a mandatory requirement, isolated resonant converters are interesting choices owing to the high-frequency operation associated with reduced switching losses, resulting in high efficiency and increased power density. 10 The phase-shift full-bridge converter associated with a resonant tank is one of the most popular isolated topologies for general-purpose applications. A bidirectional single-phase resonant full-bridge converter is presented in Hou and Emadi 11 for onboard battery chargers, employing a current-doubler circuit in the secondary side to obtain a high load current.…”

Section: Introductionmentioning

confidence: 99%

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Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

Santos

Henn

Oliveira

et al. 2023

Circuit Theory & Apps

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SummaryDC microgrids rely strongly on bidirectional dc‐dc converters responsible for managing the power flow among distinct loads and renewable energy sources like fuel cells and batteries. In this context, this work presents a three‐phase inductor‐inductor‐capacitor (LLC) resonant dc‐dc converter with high‐frequency isolation and bidirectional power flow capability, employing phase‐shift control and frequency modulation. The resonant tank takes advantage of using the leakage inductance and the magnetizing inductance of the high‐frequency transformer (HFT), which allows for improving power density. The active switches operate with a fixed duty ratio of 50% so that the converter can always achieve zero‐voltage switching (ZVS). The mathematical analysis is carried out based on a single‐phase representation of the converter, which considers only the fundamental components. A dynamic model is derived using the gyrator theory, which allows representing the converter as a frequency‐controlled current source to regulate the output voltage. In addition, the power flow direction is determined from the estimation of an ideal phase‐shift angle for each frequency aiming to control the output power. An experimental prototype is implemented and thoroughly assessed to demonstrate that the introduced topology is feasible for dc microgrids and other applications that require bidirectional power flow.

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Section: Equivalent Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

Santos

Henn

Oliveira

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…The system impedance angle φ 1 is very sensitive to the disturbance of the detuning rate μ and is greatly affected by the change of the equivalent load Re. Analysis of equation (18) shows that, again, due to the large component ωL1 (Re+R2), the sensitivity of the secondary current I2 to the detuning rate μ perturbation is high, and the change of equivalent resistance Re also has a large effect on I2. Fig.…”

Section: B Single-sided Detuning Designmentioning

confidence: 99%

“…[10][11][12] The overall efficiency of an MCR-WPT system largely depends on the losses that incur in converters and coupling coils. In case of the former, many studies have been reported in relation to the development of converter topologies [13,14] , soft-switching technology [15 -17] and synchronous rectification technology [18] . In case of the latter, studies focus on the optimization of the coil structure [19,20] and the impedance matching method to maintain efficient operation of the resonator in response to dynamic changes in load and mutual inductance.…”

Section: Introductionmentioning

confidence: 99%

An Optimal Load Indirect Matching Method without Parameter Identification and System Efficiency Optimization

Qiu

Sun

Rong

et al. 2022

Preprint

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In order to achieve efficient operation of WPT systems, the conventional direct impedance matching method that requires mutual inductance and load identification is often used, which makes the system complicated. In this paper, an indirect impedance matching method without parameter identification is proposed, especially for systems with large coupling factor and load variations. This method is based on the characteristic that the optimal voltage gain of the resonator is only related to its inherent parameters, and impedance matching can be achieved by controlling the voltage gain in real time. To further improve the efficiency of the system, a single-sided detuning design method is used to achieve soft switching of the inverter. Based on the optimal voltage gain expression derived by using both the indirect impedance matching method and the single-sided detuning design method, a compound control strategy for a series-series-compensated topology with dual-side power control is proposed to improve efficiency and stabilize the output voltage. A hardware prototype is built and a peak DC-to-DC efficiency with the optimal output resistance at about 28.9Ω is 91.58%. When the output resistance is 100Ω, the efficiency improved by 7% after using the proposed strategy.

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“…In literature, the researches on MCR-WPT system mostly focus on analyzing the characterization of this system, especially the efficiency characterization [14][15][16] .The overall efficiency of an MCR-WPT system largely depends on the losses that incur in converters and coupling coils. In case of the former, many studies have been reported in relation to the development of converter topologies 17,18 , soft-switching technology [19][20][21] and synchronous rectification technology 22 . In case of the latter, studies focus on the optimization of the coil structure 23,24 and the impedance matching method to maintain efficient operation of the resonator in response to dynamic changes in load and mutual inductance.…”

mentioning

confidence: 99%

An optimal load indirect matching method without parameter identification and system efficiency optimization

Qiu

Sun

Rong

et al. 2023

Sci Rep

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In some wireless charging applications where the coil spacing varies in real time, such as UAV, electric boat and tram, etc., the traditional direct impedance matching method is difficult to identify the mutual inductance timely and accurately, thus affecting the efficiency optimization effect of the system. In this paper, an indirect impedance matching method without parameter identification is proposed, this method is based on the characteristic that the optimal voltage gain of the resonator is only related to its inherent parameters, and impedance matching can be achieved by controlling the voltage gain in real time. To further improve the efficiency of the system, a single-sided detuning design method is used to achieve soft switching of the inverter. Based on the optimal voltage gain expression derived by using both the indirect impedance matching method and the single-sided detuning design method, a compound control strategy for a series-series-compensated topology with dual-side power control is proposed to improve efficiency and stabilize the output voltage. A hardware prototype is built and a peak DC-to-DC efficiency with the optimal output resistance RL at about 28.9 Ω is 91.58%. When the output resistance RL is 100 Ω, the efficiency improved by 7% after using the proposed strategy.

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Current Detection and Control of Synchronous Rectifier in High-Frequency LLC Resonant Converter

Cited by 19 publications

References 9 publications

Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

Three‐phase bidirectional isolated LLC resonant DC‐DC converter for DC microgrid applications

An Optimal Load Indirect Matching Method without Parameter Identification and System Efficiency Optimization

An optimal load indirect matching method without parameter identification and system efficiency optimization

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