High-Efficiency Low-EMI Buck Converter Using Multistep PWL and PVT Insensitive Oscillator

Huang, Hong-Yi; Villaruz, Harreez M.; Mapula, Nieva M.

doi:10.1109/tpel.2022.3149414

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…the test case and the clock frequency. These values are calculated using the relation (11) and the measured waveforms for all the considered clock frequencies and configurations of the spreadspectrum controller. The results show a general trend that increasing the clock frequency reduces the duty cycle error for all controller configurations.…”

Section: Fpga Prototype Verificationmentioning

confidence: 99%

“…The spread-spectrum technique, a highly effective method for reducing the electromagnetic interferences produced by switching converters, has been gaining traction in recent years. This method is utilized in a wide array of switching devices, including on-chip power supplies [8], audio amplifiers [9] and [10], and power converters [11]. Although frequently employed in commercial products, it has been noted [12] that the parameters of the spread-spectrum technique often remain unoptimized for their specific applications.…”

Section: Introductionmentioning

confidence: 99%

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Clock Frequency Optimization of a Compensated Spread-Spectrum Controller in Buck Converters

Kundrata,

Baric

2024

IEEE Access

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This research investigates the spread-spectrum technique's impact on buck converters, with a focus on electromagnetic emissions and output voltage ripple. The ripple, attributed to constant delay time in the PWM generator, induces changes in the duty cycle as the switching frequency varies due to the spread-spectrum technique. To alleviate this, a time delay compensation mechanism recalculated at each switching frequency change is proposed. To address duty cycle inaccuracies from integer calculations in a digital core, a remainder accumulator in time delay calculation is introduced. A numerical model parametrized by the controller's clock frequency and spread-spectrum resolution examines duty cycle error, ripple, and EMI peak reduction. Findings indicate that the proposed compensator and accumulator reduce duty cycle error while maintaining comparable ripple and achieving similar EMI peak reduction. EMI peak reduction plateaus at higher clock frequencies, suggesting an optimal clock frequency. Experimental results from an FPGA prototype corroborate the model and simulations, showing substantial duty cycle error reduction, comparable ripple, and maximized EMI peak reduction. The study thus illustrates the spreadspectrum technique's potential in buck converters, providing an optimal configuration for EMI reduction and minimizing duty cycle error and ripple.INDEX TERMS DC-DC converter, digital design, duty cycle ripple, EMI, spread-spectrum

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Section: Fpga Prototype Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clock Frequency Optimization of a Compensated Spread-Spectrum Controller in Buck Converters

Kundrata,

Baric

2024

IEEE Access

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“…Electromagnetic interference (EMI) is an inherent phenomenon in the world of electrical pulsed power technologies and goes along with the recent technological progress regarding their associated monitoring devices [1,2]. Pulsed power (PP) generators more and more often feature solid-state devices and, more specifically, wide-bandgap semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Analytical and 3D Numerical Study of Multilayer Shielding Effectiveness for Board Level Shielding Optimization

et al. 2022

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The strong development of solid-state power sources offers numerous benefits (such as higher operating frequencies and reduced switching times and power losses), but contributes inherently to the extended range of electromagnetic interferences (EMI). As these systems are associated with a set of embedded monitoring devices using low amplitude signals, it becomes necessary to consider new critical cases of electromagnetic (EM) immunity correlated to such environments. The most common solution against aggressive radiated EMI is the metallic enclosure, which brings a strong shielding effectiveness (SE), but is it always the best compromise? Our study in this paper is focused on the SE of multilayer designs and is therefore intended to optimize the enclosures’ compactness for board level shielding (BLS) on printed circuit boards (PCB). First, results are presented, based on metallic multilayer shielding theory and parametric numerical studies in the intentional electromagnetic interferences (IEMI) frequency range, from 0.2 to 5 GHz. Then, a complete 3D EM co-simulation model using the microwave and design modules of CST Studio Suite (which includes the subject, the EMI radiating source, and the multilayer shielding) is proposed, with emphasis on the pertinent choices regarding layers width and their arrangement for compact EM shielding and immunity optimization.

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Buck Converter with Variable Output Voltage for Dynamic Voltage Scaling (DVS) Applications

Villaruz,

Huang,

Mapula

et al. 2023

2023 22nd International Symposium on Communications and Information Technologies (ISCIT)

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High-Efficiency Low-EMI Buck Converter Using Multistep PWL and PVT Insensitive Oscillator

Cited by 5 publications

References 15 publications

Clock Frequency Optimization of a Compensated Spread-Spectrum Controller in Buck Converters

Clock Frequency Optimization of a Compensated Spread-Spectrum Controller in Buck Converters

Analytical and 3D Numerical Study of Multilayer Shielding Effectiveness for Board Level Shielding Optimization

Buck Converter with Variable Output Voltage for Dynamic Voltage Scaling (DVS) Applications

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