Practical design issues for PFC circuits

Noon, J.P.; Dalal, D.

doi:10.1109/apec.1997.581433

Cited by 40 publications

(6 citation statements)

References 4 publications

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“…Since the magnitude of the ω m component is much smaller than that of the 2ω m component or the dc components, (19) and (21) can be approximated as Combining (22), (24), (32), and (33), and imposing the steadystate condition, we get…”

Section: B Fourier Series Expansionmentioning

confidence: 99%

Line-Frequency Instability of PFC Power Supplies

Chu

Tse

Wong

2009

IEEE Trans. Power Electron.

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Typically, a power-factor-correction (PFC) power supply consists of two stages, one responsible for PFC and the other for voltage regulation. In this paper, we propose to use a constant power sink to represent the voltage regulating stage, resulting in an analytically tractable model that is able to predict the period-doubled oscillations at line frequency that are not detectable by other conventional models. Using a generalized averaging approach, we investigate the low-frequency dynamics and derive closed-form stability conditions that accurately locate the stability boundaries on selected parameter planes. The model can be conveniently used to evaluate the performance of PFC power supplies, such as harmonic distortion and power factor. Experimental results are presented to verify the model.

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Section: B Fourier Series Expansionmentioning

confidence: 99%

Line-Frequency Instability of PFC Power Supplies

Chu

Tse

Wong

2009

IEEE Trans. Power Electron.

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“…Finally, the input capacitance C i must filter the inductor current ripple both for grid compliance reasons and for reducing the current stress on the input diode bridge. A large capacitance value translates in a higher filtering ability; however it reduces the input power factor by increasing the phase shift between grid voltage and grid current, and it leads to noticeable distortion around the current zero-crossings [38,39]. An upper filter capacitance limit is thus given by…”

Section: Structure and Operationmentioning

confidence: 99%

Full Digital Control of an All-Si On-Board Charger Operating in Discontinuous Conduction Mode

et al. 2021

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This paper deals with the design, tuning and implementation of a digital controller for an all-Si electric vehicle (EV) on-board battery charger operated in discontinuous conduction mode (DCM). This charger consists of two cascaded conversion stages: a front-end power factor corrector (PFC) with two interleaved legs and an isolated phase-shifted full bridge DC/DC converter. Both stages operate in DCM over the complete battery charging power range, allowing lower inductance values for both the PFC and the DC/DC filtering elements. Moreover, DCM operation ensures a large reduction of the reverse-recovery losses in the power diodes, enabling the adoption of relatively cheap Si devices. The main goal of the work is to address the well-known DCM control challenges, leveraging a novel control strategy for both converter stages. This control scheme counteracts the DCM system non-linearities with a proper feed-forward contribution and an open-loop gain adjustment, ensuring consistent dynamical performance over the complete operating range. The designed controllers are tuned analytically, taking into account the delay components related to the digital implementation. Finally, the proposed control strategy is implemented on a single general purpose microcontroller unit (MCU) and its performance is experimentally validated on a 3.3 kW battery charger prototype.

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“…As the phase current of the rectifier is forced to zero during t demag , the sensor concept causes current distortions in the input current i N . Since several other effects, such as cusp distortion [30] or discontinuous-mode (DCM) of operation of the boost inductor [31], already generate zero crossing distortions, the distortions caused by the proposed sensor concept are not significant. In Fig.…”

Section: Principle Of Operationmentioning

confidence: 99%

Wideband Current Transducer for Measuring AC Signals With Limited DC Offset

Hartmann

Biela

Ertl

et al. 2009

IEEE Trans. Power Electron.

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In many applications, a current measurement that can measure ac currents with dc offset is required. This is not possible using conventional current transformers (CTs) due to the core saturation because of the dc offset. In this paper, a new sensor concept is presented, which consists of a wideband CT and a demagnetizing circuit. The sensor concept is capable of measuring ac currents with dc offset, which have periodic zero crossings, as given in power-factor-corrected (PFC) circuits. Using the demagnetization circuit, the core is actively reset during the zero crossing intervals. The operation principle and design equations are discussed in detail in this paper. For validating the presented concept, three sensors have been built using different core materials, and measurements of the transfer functions as well as operation in a PFC system are presented. A bandwidth from dc up to 20 MHz has been achieved.

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Practical design issues for PFC circuits

Cited by 40 publications

References 4 publications

Line-Frequency Instability of PFC Power Supplies

Line-Frequency Instability of PFC Power Supplies

Full Digital Control of an All-Si On-Board Charger Operating in Discontinuous Conduction Mode

Wideband Current Transducer for Measuring AC Signals With Limited DC Offset

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