Designing an Adjustable Wide Range Regulated Current Source

Beiranvand, Reza; Rashidian, Bizhan; Zolghadri, Mohammad Reza; Alavi, Seyed Mohammad Hossein

doi:10.1109/tpel.2009.2027237

Cited by 47 publications

(21 citation statements)

References 9 publications

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“…The converter output voltage is adjusted by increasing or decreasing the switching frequency. An adjustable output voltage (or current) in a wide range is introduced in [12]- [14] for the LLC resonant converter. A wide frequency variance with a large inductance ratio supplies wide input voltage and load changes.…”

Section: Zleqmentioning

confidence: 99%

Analysis of a CLL Resonant Converter With Semi-Bridgeless Active Rectifier and Hybrid Control

Asa

Colak

Czarkowski

2015

IEEE Trans. Ind. Electron.

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Section: Zleqmentioning

confidence: 99%

Analysis of a CLL Resonant Converter With Semi-Bridgeless Active Rectifier and Hybrid Control

Asa

Colak

Czarkowski

2015

IEEE Trans. Ind. Electron.

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“…The latter is more general than the first. In earlier works, this converter has been used for designing wide output range SMPSs and it has been shown that by using frequency control, this converter can handle a wide-range of regulated output voltage even when input voltage and load have large variations [16]- [18]. To attain this purpose, zero voltage switching (ZVS) operation even under the worst case conditions is one of the most important subjects that must be realized for reducing electromagnetic interference (EMI) and improving the efficiency and performance of the converter.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it can only be used for the constant output voltage applications, as can be concluded from [19]. Also, the given approaches in [16]- [18] need more investigation in order to be implemented, practically. According to the [19], the first-harmonic approximation (FHA) approach can only be used for analyzing the resonant converters near the resonant frequency.…”

Section: Introductionmentioning

confidence: 99%

“…LLC RESONANT-CONVERTER-NORMALIZED DC OUTPUT VOLTAGE LLC resonant converter can be used for wide output range SMPSs for supplying output loads which change between full load and no load [16]. This converter and its ac equivalent circuit, based on the FHA approach, have been depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The other harmonics of the switching frequency are ignored [19]. In this equivalent circuit, R o is derived as follows [5], [16]- [19], [23]:…”

Section: Introductionmentioning

confidence: 99%

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A Design Procedure for Optimizing the LLC Resonant Converter as a Wide Output Range Voltage Source

Beiranvand

Rashidian

Zolghadri

et al. 2012

IEEE Trans. Power Electron.

242

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LLC resonant converter is one of the most suitable circuit topologies that have been introduced for designing constant output voltage switched-mode power supplies. In this paper, a design procedure is introduced for using this converter as a wide output range voltage source. Unlike constant output voltage applications which need small converter inductance ratio and narrow switching frequency variations, for wide output range applications, large values of these parameters are needed simultaneously and should be optimized. Instead of minimizing the components stresses, leading to a great value of the inductance ratio, proper choice of the converter parameters resulting in a smaller inductance ratio has been done. Maximum value of the capacitor in parallel with the power MOSFETs drain-sources has been derived to realize the zero voltage switching operation in the converter inductive region. Soft switching is achieved for all power devices under all operating conditions. A prototype of the converter has been tested for different regulated output voltages (35-165 V d c ) under different loads (0-3 A d c ) and input voltages (320-370 V d c ) for using an ion implanter arc power supply, with maximum efficiency value of 94.7%. Experimental results confirm the high performance of the wide output range LLC resonant converter even under the worst case conditions. Index Terms-LLC resonant converter, switched-mode power supply (SMPS), wide output range, zero current switching (ZCS), zero voltage switching (ZVS). NOMENCLATURE a, nConverter inductance ratio and transformer turns ratio. I in N and I in max N Normalized ac input current and its maximum value. I out and I out maxOutput dc current and its maximum value. I DSM 1 and I D MOSFET drain-source and diode currents. k z Converter's input impedance ratio. V in , V in min , DC input voltage and its maximum and minimum values. and V in max V in N , V in min N , Normalized dc input voltage and its maximum and minimum values. and V in max N V out , V out min , DC output voltage and its maximum and minimum values. and V out max V out N , V out min N , Normalized dc output voltage and its maximum and minimum values. and V out max N V outFL and V outNL DC output voltage under the maximum output current and no-load conditions. V C r , V r out Resonant capacitor voltage and output ripple. V C r max , V C r max N Resonant capacitor maximum voltage and its normalized value. V DSM and V CAD Power MOSFET drain-source and power diode cathode-anode voltages. V ARR Output voltage adjustable range ratio. P out and P out max Output power and its maximum value. Q and Q max L Quality factor and its value for maximum output current and voltage. f r , f s , f s min , Resonant frequency, switching frequency, and its minimum and maximum values (in hertz).and f s max f n , f n min , Normalized switching frequency and its minimum and maximum values (dimensionless), respectively. and f n max Z in , Z in 0 , Z in∞ , Input impedance, its values at short-circuit and no-load conditions, and its normalize...

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Efficiency improvement for LLC converter based on automatic tuning of blanking time

Hwu

Guo

2019

Circuit Theory & Apps

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Summary As for the traditional LLC converter, there is a problem in efficiency at light load. In order to keep the output voltage of this converter constant at a given value at light load, the switching frequency will be increased, and hence, the efficiency would be degraded. Consequently, based on the inherent frequency modulation and from the point of view of blanking time tuning, the efficiency at light load will be further improved due to circular current reduction, and at the same time, the efficiencies under other operating conditions are also enhanced. In this paper, the strategy for automatically adjusting the blanking time is described and analyzed. Afterwards, the digital signal processor (DSP) is used as a circuit control kernel, and an experimental setup, with input voltage of 400 ± 10 V, rated output voltage of 12 V, and rated output current of 20 A, is provided to demonstrate the effectiveness of the proposed strategy.

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Designing an Adjustable Wide Range Regulated Current Source

Cited by 47 publications

References 9 publications

Analysis of a CLL Resonant Converter With Semi-Bridgeless Active Rectifier and Hybrid Control

Analysis of a CLL Resonant Converter With Semi-Bridgeless Active Rectifier and Hybrid Control

A Design Procedure for Optimizing the LLC Resonant Converter as a Wide Output Range Voltage Source

Efficiency improvement for LLC converter based on automatic tuning of blanking time

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