Double-Phase High-Efficiency, Wide Load Range High- Voltage/Low-Voltage &lt;italic&gt;LLC&lt;/italic&gt; DC/DC Converter for Electric/Hybrid Vehicles

Yang, Gang; Dubus, Patrick; Sadarnac, Daniel

doi:10.1109/tpel.2014.2328554

Cited by 94 publications

(23 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If we assume that the first term on the right-hand side of (8) is much larger than the sum of the second and third term, A o_app1 can be approximated as 2 3…”

Section: Proposed Voltage Controlled Oscillatormentioning

confidence: 99%

Adaptive Voltage Controlled Oscillator for Improved Dynamic Performance in LLC Resonant Converter

Kang

Kim

Cho

2015

IEEE Trans. on Ind. Applicat.

View full text Add to dashboard Cite

IEEE Transactions on Industry Applications(a) (b) Fig. 1. Over wide operating conditions, the variation of (a) switching frequency, (b) frequency response of frequency-to-output voltage transfer function.Abstract --This paper proposes an adaptive voltage controlled oscillator (VCO) to improve the dynamic performance in LLC resonant converters. The proposed adaptive VCO is designed to have frequency-dependent small-signal gains so that the variation of low frequency magnitude in frequency response of LLC resonant converter is effectively adjusted. As a result, an enhanced dynamic performance is obtained over wide operating ranges. Through approximated derivation, the proposed adaptive VCO has a simple formula and does not require any additional sensing circuits. Furthermore, it is robust to variation of circuit parameters. Dynamic performance enhancement was verified by experimental results with a 144-W laboratory prototype half-bridge LLC resonant converter.Index Terms--LLC resonant converter, voltage controlled oscillator (VCO), adaptive gain, dynamic performance.

show abstract

“…If we assume that the first term on the right-hand side of (8) is much larger than the sum of the second and third term, A o_app1 can be approximated as 2 3…”

Section: Proposed Voltage Controlled Oscillatormentioning

confidence: 99%

Adaptive Voltage Controlled Oscillator for Improved Dynamic Performance in LLC Resonant Converter

Kang

Kim

Cho

2015

IEEE Trans. on Ind. Applicat.

View full text Add to dashboard Cite

show abstract

“…Recently, the LLC resonant converters find ever increasing applications to more sophisticated and bigger energy conversion systems, primarily due to the high efficiency of the converter. The LLC resonant converters are used as a battery charger [4][5][6] for energy storage systems, a bidirectional converter for dc power distribution systems [7], a line level controller for solar power systems [8], and a DC-to-DC converter for electric vehicles [9].…”

Section: Introductionmentioning

confidence: 99%

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

Jang¹,

Pidaparthy

Choi

2015

Energies

View full text Add to dashboard Cite

Conventional voltage mode control only offers limited performance for LLC series resonant DC-to-DC converters experiencing wide variations in operational conditions. When the existing voltage mode control is employed, the closed-loop performance of the converter is directly affected by unavoidable changes in power stage dynamics. Thus, a specific control design optimized at one particular operating point could become unacceptable when the operational condition is varied. This paper presents a new current mode control scheme which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current of the resonant tank network to overcome the limitation of the existing voltage mode control. The superiority of the proposed current mode control over the conventional voltage mode control is verified using an experimental 150 W LLC series resonant DC-to-DC converter.

show abstract

“…(Z rp = L p /C p ) Q rs : Series resonant loaded quality factor (Q rs = Z rs /R ac ) λ rs : Series / ant-resonant characteristics impedances ratio (λ rs = Z rs /Z rp ) λ rm : LLC / anti-resonant characteristics impedances ratio (λ rm = Z rm /Z rp ) I. INTRODUCTION An asymmetrical half-bridge LLC resonant dc-dc converter has been gaining the popularity in a variety of switching power supplies encompassing from a small power ICT equipment, LED lighting, battery chargers for electric vehicles, to a dc micro-grid power distribution system due to a soft-switching operation over the wide range of load power; zero voltage soft-switching (ZVS) of active switches and zero current softswitching (ZCS) of rectifier diodes [1]- [11]. The wide range of soft switching operation in the LLC converter is attractive for a full-bridge dc-dc converter topology as well, while a typical phase-shift pulse-width-modulation (PS-PWM) fullbridge circuit topology suffers from a severely-limited range of soft switching for load power variations.…”

mentioning

confidence: 99%

A Sensitivity-Improved PFM <italic>LLC</italic> Resonant Full-Bridge DC–DC Converter With <italic> LC</italic> Antiresonant Circuitry

Mishima

Mizutani

Nakaoka

2017

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

An LLC resonant circuit-based full-bridge dc-dc converter with an LC anti-resonant tank for improving the performance of pulse-frequency-modulation (PFM) is proposed in this paper. The proposed resonant dc-dc converter, named as LLC-LC converter can extend a voltage regulation area below the unity gain with a smaller frequency variation of PFM by the effect of the anti-resonant tank. This advantageous property contributes for protecting over-current in the case of the short-circuit load condition as well as the start-up interval in the designed band of switching frequency. The circuit topology and operating principle of the proposed converter is described, after which the design procedure of the operating frequency and circuit parameters is presented. The performances on the soft switching and the steady-state PFM characteristics of the LLC-LC converter are evaluated under the open-loop control in experiment of a 2.5 kW prototype, and its actual efficiency is compared with a LLC converter prototype. For revealing the effectiveness of the LLC-LC resonant circuitry, voltages and currents of the series and anti-resonant tanks are analyzed respectively with state-plane trajectories based on calculation and experiment, whereby the power and energy of each resonant tank are demonstrated. Finally, the feasibility of the proposed converter is evaluated from the practical point of view. Keywords-LLC resonant converter, anti-resonant tank, LLC-LC resonant converter, pulse frequency modulation (PFM), over-current protection (OCP), buck and boost voltage regulations, zero voltage soft-switching (ZVS), zero current soft-switching (ZCS). Nomenclature f s : Switching frequency ω s : Angular switching frequency (ω s = 2πf s) M : Input / output voltage conversion ratio (M = V o /V in) a : High-frequency transformer windings turns ratio (a = N 1 /N 2) f rs : Series resonant frequency (f rs = 1/(2π √ L s C s)) f rm : LLC resonant frequency (f rm = 1/(2π (L s + L m)C s)) F rs : Switching frequency normalized to series resonant frequency (F rs = f s /f rs)

show abstract

Double-Phase High-Efficiency, Wide Load Range High- Voltage/Low-Voltage <italic>LLC</italic> DC/DC Converter for Electric/Hybrid Vehicles

Cited by 94 publications

References 19 publications

Adaptive Voltage Controlled Oscillator for Improved Dynamic Performance in LLC Resonant Converter

Adaptive Voltage Controlled Oscillator for Improved Dynamic Performance in LLC Resonant Converter

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

A Sensitivity-Improved PFM <italic>LLC</italic> Resonant Full-Bridge DC–DC Converter With <italic> LC</italic> Antiresonant Circuitry

Contact Info

Product

Resources

About