Non‐isolated high step‐up/step‐down quadratic converter for light‐emitting diode driving

Corrêa, Douglas Rosa; Morais, Aniel Silva de; Tofoli, Fernando Lessa

doi:10.1002/cta.3035

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…More recently, the “true” quadratic SEPIC converter was introduced in Ref. 27 to provide input PFC in a LED driver, whose front‐end stage operates in DCM. The SEPIC converter has a natural voltage follower characteristic and thus a current control loop is not necessary.…”

Section: Resultsmentioning

confidence: 99%

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Non‐isolated high step‐up / step‐down DC–DC quadratic Ćuk converter

Oliveira

Ribeiro

Morais

et al. 2021

Int Trans Electr Energ Syst

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This work presents a non-isolated DC-DC quadratic Cuk topology, which results from the cascade connection of two conventional Cuk converters. Using the graft scheme and rearranging the power stage, it is possible to obtain a single-switch version of the converter with fewer components when compared with its two-switch counterpart. The converter can provide both voltage stepdown and step-up by varying the duty cycle imposed to the active switch, this being an interesting solution for applications that demand a wide conversion range. Both the current drawn from the source and supplied to the output stage are non-pulsating when the converter operates in continuous conduction mode (CCM), contributing to the reduction of electromagnetic interference (EMI) levels. Both the input voltage and output voltage present the same polarity as well. A comprehensive mathematical analysis is derived for the converter operating in step-up and step-down modes, as it is possible to obtain a consistent design procedure. A laboratory prototype is also implemented and thoroughly assessed experimentally to validate the theoretical assumptions.

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Section: Resultsmentioning

confidence: 99%

“…Only more recently, a quadratic SEPIC converter was addressed in Ref. 27 as a PFC rectifier for LED driving. On the other hand, the quadratic Ćuk and Zeta converters remain unexplored so far in the literature.…”

Section: Introductionmentioning

confidence: 99%

Non‐isolated high step‐up / step‐down DC–DC quadratic Ćuk converter

Oliveira

Ribeiro

Morais

et al. 2021

Int Trans Electr Energ Syst

Self Cite

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“…It is necessary to cascade the basic cells represented in the dashed boxes to extend the conversion ratio, as well as to maintain the N-th stage associated with the output stage in any resulting converter. A quadratic AC-DC quadratic SEPIC converter employed as an LED driver was proposed in [44], resulting in a high input power factor and high efficiency over a wide load range while considering a moderate voltage gain. It is also noteworthy that the quadratic Zeta converter shown in Figure 12b remains unexplored thus far.…”

Section: Deriving Multistage Single-switch Non-isolated Dc-dc Convertersmentioning

confidence: 99%

Review, Properties, and Synthesis of Single-Switch Non-Isolated DC-DC Converters with a Wide Conversion Range

Tofoli,

Carlos,

Morais

2024

Sensors

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The cascaded connection of power converters extends conversion ranges but requires careful consideration due to high component count and efficiency concerns, as power is processed redundantly. Furthermore, using several active switches that must be turned on simultaneously may introduce significant drive and control complexity. To overcome this limitation, single-switch quadratic DC-DC converters have been proposed in the literature as a prominent choice for various applications, such as light-emitting diode (LED) drivers. Nevertheless, the motivation behind the conception of such topologies, beyond extending the conversion ratio, remains unclear. Another unexplored issue is the possibility of obtaining single-switch versions of cascaded converters consisting of multiple stages. In this context, this work investigates the synthesis of single-switch non-isolated DC-DC converters for achieving high step-down and/or high step-up based on the graft scheme. Key issues such as the voltage gain, additional stresses on the active switches, component count, and behavior of the input current and output stage current are addressed in detail. An in-depth discussion is presented to identify potential advantages and shortcomings of the resulting structures.

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Half‐bridge secondary series resonant converter control for full voltage range

Kong,

Sun,

et al. 2024

Circuit Theory & Apps

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SummaryThis paper proposes a full‐range regulation method for half‐bridge secondary series resonant converter. With the proposed method, the resonant converter can achieve full‐range regulation within a narrow frequency range regardless of the load level. Besides, the converter can be used for the battery charger systems and programmable power supply systems. The primary‐side transistors and the secondary‐side diodes are zero‐voltage switching turned on and zero‐current switching turned off, respectively. In‐depth analysis reveals the characteristics, that is, operation principle, voltage conversion ratio, component stresses, and ZVS condition of the half‐bridge secondary series resonant converter with the proposed method. Besides, the performance comparisons among the different methods are conducted to present the merits of the proposed method. Further, the performance comparisons between the half‐bridge secondary series resonant converter and primary series resonant converter with the proposed method are executed to show their superiority with different turns ratio range of the transformer, respectively. When the turns ratio is larger than 0.5 and smaller than 1, the performance of the half‐bridge primary series resonant converter is better; when the turns ratio is equal to 1, the two configurations feature the same performance; while when the turns ratio is larger than 1, the half‐bridge secondary series resonant converter is preferable. The experimental results validate the theoretical analysis.

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Non‐isolated high step‐up/step‐down quadratic converter for light‐emitting diode driving

Cited by 8 publications

References 37 publications

Non‐isolated high step‐up / step‐down DC–DC quadratic Ćuk converter

Non‐isolated high step‐up / step‐down DC–DC quadratic Ćuk converter

Review, Properties, and Synthesis of Single-Switch Non-Isolated DC-DC Converters with a Wide Conversion Range

Half‐bridge secondary series resonant converter control for full voltage range

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