A single-switch LCL-resonant isolated DC-DC converter

The control of the quadratic boost converter with unknown load resistance and where only the output voltage is used for feedback purposes is addressed. In the existing voltage-mode controlled converter system, there exists a performance 'trade-off' between the transient responses after the onset of a reference input and a load disturbance due to the usage of the traditional proportional-integral control scheme. To overcome these problems, a modified voltage-mode controller is proposed. The proposed controller uses a normalised integral action in which the derivative of the integrand is bounded by a user-defined constant. The approximate stability analysis of the resultant voltage-mode controlled quadratic boost converter system is carried out to gain some insight into its closed-loop behaviour. Some simulation and experimental results comparing the performance of the proposed controller with that of the existing controller are also provided to show the improvements obtained using the proposed controller.

“…The integrand is bounded as is shown in the following. For simplicity, the symbol of n is used to represent (9), that is…”

Section: Proposed Control Lawmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modified voltage‐mode controller for the quadratic boost converter with improved output performance

Jiang

Chincholkar

Chan

2018

“…An interleaved isolated high voltage gain step-up converter is proposed in [25], which employs a series resonant tank in the secondary winding to achieve ZVS in power switches and ZCS in rectifier diodes. A single-switch isolated DC-DC converter based on the LCL resonant circuit is proposed in [26]. The converter achieves soft switching (ZCS); however, it utilises extra components to achieve the ZCS operation and suffers from a high voltage spike and severe ringing across the switch.…”

Section: Introductionmentioning

confidence: 99%

Analysis and experimental verification of a single‐switch high‐voltage gain ZCS DC–DC converter

Hassan

Xiao

2019

This study proposes and analyses the integration of soft-switching technique with a single switch, non-isolated, coupled inductor DC-DC converter to achieve high efficiency and high step-up conversion ratio. The topology optimally integrates the coupled inductor and soft-switching technique using a parallel LC resonant tank circuit to maintain zero-current switching (ZCS) for on/off switching. The leakage inductance of the coupled inductor alleviates the reverse-recovery issue of diodes, and diodes can operate under ZCS condition. Moreover, the converter operates in a lower frequency range due to high step-up voltage gain. The principle of operation and steady-state analyses of the proposed converter are presented. A prototype validates the theoretical analysis and demonstrates a higher peak efficiency of 96.43% than the corresponding hard-switched converter.

“…Recently, except for LLC resonant converter, considerable research has been focused on isolated resonant converter for highefficiency DC/DC conversion [27][28][29][30][31][32]. A majority of the proposed converters are actually multi-element resonant converters, such as LCL resonant converter [27] and LCC resonant converter [28], which utilise the parasitic parameter of the switch, diode, transformer and even printed circuit board (PCB) layer. Ren et al [29] proposed a 10 MHz isolated class-Φ 2 resonant converter, which utilises parasitic elements as the resonant elements to achieve ZVS operation.…”

Section: Introductionmentioning

confidence: 99%

MHz zero‐voltage‐switched isolated resonant converter for wide‐output‐voltage application

Jin

2017

This study proposes a MHz isolated resonant converter, which achieves buck-boost DC/DC conversion, zero-voltage switching and the resonant components absorb the parasitic parameters. The DC analysis method and MATLAB computational algorithm are proposed for acquiring the specific circuit characteristics, including the voltage conversion ratio, the rms value of switch current and peak voltage of the semiconductors. The active power and apparent power are also analysed to provide design basis of optimising efficiency. The proposed converter shows greater advantages on voltage stress, current stress and efficiency over traditional isolated Sepic multi-resonant converter. A wide-output-voltage prototype based on the proposed converter was built in the lab and the experimental results verify the theoretical analysis well.