Constant frequency control of LLC resonant converter using switched capacitor

Chung, Se-Kyo; Kang, Byunggu; Kim, M. S.

doi:10.1049/el.2013.2725

Cited by 32 publications

(9 citation statements)

References 4 publications

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“…The conduction loss of synchronous rectifier can be calculated as: (12) where I s_rms can be expressed as [35] (13) When operating at its resonant frequency, the SR of LLC resonant converter exhibits ZCS; hence, the switching loss of SR is neglected.…”

Section: ) Losses Of the Synchronous Rectifier (Sr) S1 And S2mentioning

confidence: 99%

“…Generally, the optimal performance of an LLC resonant converter occurs when the switching frequency equals the resonant frequency [11]- [16]. However, this is difficult to achieve without adding mechanisms such as changes to the resonant tank parameters [12], [13] or modulation of the LLC resonant converter input voltage [14]- [16]. In addition, the LLC resonant converter relies on a frequency control mechanism to achieve voltage regulation.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive DC-Link Voltage Control of LLC Resonant Converter

2018

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Section: ) Losses Of the Synchronous Rectifier (Sr) S1 And S2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive DC-Link Voltage Control of LLC Resonant Converter

2018

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“…Since the equivalent capacitance of SCC is proportional to the charge amount Q during a cycle [27], the derivation of equivalent capacitance is given as (1)…”

Section: Scc Operational Cycle Analysismentioning

confidence: 99%

Precise current sharing control for multi‐channel LED driver based on switch‐controlled capacitor

Liu

Sun

Zeng

2017

IET Power Electronics

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A switch-controlled capacitor (SCC)-based driver circuit is proposed for current sharing of multi-channel lightemitting diode (LED). The proposed circuit includes a transformer primary side and several secondary sides. Each secondary side as an independent unit includes an SCC module, a resonant inductor and an H-bridge to power twochannel LEDs. Two output channels within a capacitor unit achieve current sharing due to charging or discharging balance of SCC module. Since the current in each capacitor unit can be regulated independently, the proposed topology is accommodated with more units. The current sharing among different capacitor units can be realised by the adjustment of SCC module; therefore, the dimming also can be accomplished for multi-channel LEDs. The operating cycles of SCC module, the working mode and simplified equivalent circuit are analysed in detail. The relations of LED current versus the equivalent capacitance are examined. The performance is evaluated by four-channel prototype with input voltage of 48 V and rated power of 20 W. The output current is regulated from 180 to 350 mA per LED channel. The experimental results further prove that the proposed topology can effectively achieve current sharing of two LED channels, current sharing of four-channel LED and independent dimming.

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“…To solve the above‐mentioned problems, many different approaches have been proposed. Generally, the existing solutions can be categorised into the following three groups: (i) accurate design methodologies [10–13]; (ii) hybrid modulation strategies [14–20]; (iii) modifications on traditional LLC topology [21–25] or topology morphing control strategy [26–29].…”

Section: Introductionmentioning

confidence: 99%