Conducted EMI Mitigation Schemes in Isolated Switching-Mode Power Supply Without the Need of a Y-Capacitor

Bai, Yongjiang; Yang, Xu; Zhang, Dan; Li, Xinlei; Chen, Wenjie; Hu, Weihao

doi:10.1109/tpel.2016.2579679

Cited by 42 publications

(16 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, ac three-phase mains is connected to the mid-points of each winding of a three-phase machine (IM or PM) through an electromagnetic interference (EMI) filter and other protection devices. The main function of the EMI filter is to reduce highfrequency electromagnetic noise [54]. No additional components are required.…”

Section: B Fast Three-phase Chargingmentioning

confidence: 99%

A Review of Integrated On-Board EV Battery Chargers: Advanced Topologies, Recent Developments and Optimal Selection of FSCW Slot/Pole Combination

et al. 2020

View full text Add to dashboard Cite

Integrated on-board battery chargers (OBCs) have been recently introduced as an optimal/elegant solution to increase electric vehicle (EV) market penetration as well as minimize overall EV cost. Unlike conventional off-board and on-board battery chargers, integrated OBCs exploit the existing propulsion equipment for battery charging without extra bulky components and/or dedicated infrastructure. OBCs are broadly categorized into three-phase and single-phase types with unidirectional or bidirectional power flow. This paper starts with surveying the main topologies introduced in the recent literature employing either induction or permanent magnet motors to realize fully integrated slow (single-phase) and fast (threephase) on-board EV battery charging systems, with emphasis on topologies that entail no or minimum hardware reconfiguration. Although, permanent magnet (PM) motors with conventional double-layer distributed winding layouts have been deployed in most commercial EV motors, the non-overlapped fractional slot concentrated winding (FSCW) has been the prevailing choice in the most recent permanent magnet motor designs due to its outstanding operational merits. Hence, a thorough investigation of the impact different FSCW stator winding designs have on machine performance under the charging process is presented in this paper. To this end, the induced magnet losses, which represent a challenging demerit of the FSCW, have been used to compare different topologies under both propulsion and charging operation modes. Based on the introduced comparative study, the optimal slot/pole combinations that correspond to the best compromise under both operational modes have been highlighted. INDEX TERMS Integrated chargers, on-board battery chargers (OBCs), multiphase machines, fractional slot concentrated winding (FSCW), battery charging, optimal slot/pole combinations, reviews. MOHAMED Y. METWLY received the B.Sc. degree in electrical engineering from Alexandria University, Alexandria, Egypt, in 2018. He is currently a Researcher with Smart-CI, Alexandria University. His current research interests include battery chargers, electric vehicles, and renewable energy systems. MAHMOUD S. ABDEL-MAJEED received the B.Sc. degree in electrical engineering from Alexandria University, Alexandria, Egypt, in 2019. He is currently a Researcher with Smart-CI, Alexandria University. His current research interests include battery chargers, automotive, smart grid, and power electronics.

show abstract

Section: B Fast Three-phase Chargingmentioning

confidence: 99%

A Review of Integrated On-Board EV Battery Chargers: Advanced Topologies, Recent Developments and Optimal Selection of FSCW Slot/Pole Combination

et al. 2020

View full text Add to dashboard Cite

show abstract

“…When the MOSFET is off and the diode is on, the C z capacitor appears across the primary of the transformer. The approximate transfer functions (20) for the equivalent circuit are shown in Fig. 14. The transfer function has a resonant frequency given as follows:…”

Section: Calculation Of Balancing Capacitor (C Z )mentioning

confidence: 99%

“…If a person comes in contact with the equipment having defective ground, the leakage current will flow through the person to the earth. There are limits set by international standards [20] for allowable leakage current. The

C_{z}

C_{m 1}

, and

C_{m 2}

are balancing capacitors used in a flyback converter to eliminate the Y capacitor.…”

Section: Mitigation Of CM Conducted Emimentioning

confidence: 99%

Mitigation of CM conducted EMI in flyback converter using balancing capacitors

Manjunath

Sudheer

2020

IET power electron.

View full text Add to dashboard Cite

The offline Switched Mode Power Supply (SMPS) draw non-sinusoidal line current from the utility power supply, thereby introducing unwanted harmonics and also generate significant electromagnetic interference (EMI). Power factor correction (PFC) converters can be used to improve the power factor. But they also generate EMI in both Differential Mode (DM) and Common Mode (CM). In this paper, the EMI generated by the flyback PFC converter is addressed. A lumped circuit model for CM conducted EMI generated in a flyback converter, including the HF transformer's parasitics and the components, is considered. The parasitics of the HF transformer are calculated and measured experimentally. Using them, the resonant frequencies of the flyback converter are calculated for validation. A technique for determining the required balancing capacitor to mitigate CM conducted EMI is presented. A novel technique by splitting this balancing capacitor with their mid-point grounded for further reduction of this EMI is presented. This technique can eliminate the C y capacitors of the EMI line filter connected between line/neutral to the ground. Hence for the same amount of CM conducted EMI mitigation, the size and the cost of EMI line filters are reduced. Theoretical analysis, simulation results, and experimental verifications are presented.

show abstract

“…For the previous CM noise reduction techniques, like shielding technique [6], introducing anti-phases displacement current, and balance winding technique [11] are proposed in view of the transformer design. Then these techniques can only reduce the CM current flowing through the transformer.…”

Section: CM Noise Reduction Techniquementioning

confidence: 99%

Evaluation Method of Flyback Converter Behaviors on Common-Mode Noise

Chen

2019

IEEE Access

View full text Add to dashboard Cite

Common-mode (CM) conduction electromagnetic interference (EMI) is a challenge for switched-mode power supply (SMPS) designers. A flyback converter is a traditional topology used in low-power isolated applications. The size and cost of EMI filters are important considerations for higher power density and lower cost of SMPS design. In most cases, the CM current is generated by voltage pulsation (dv/dt) assigned on the primary winding and the secondary winding. The CM current conduction paths can be mainly categorized into two categories. One is the interwinding parasitic capacitance of the transformer, and the other is the parasitic capacitance between the semiconductor switches and the protective ground. This paper proposed an evaluation method to measure the equivalent CM noise capacitance of the two main CM current conduction paths, respectively. Then, this paper proposed a CM noise cancellation scheme based on the transformer winding design combining the measurement technique and the FEM simulation tool. Planar transformers with PCB windings also have advantages in low profile, good heat dissipation, and good stray parameter consistency. Based on these considerations, an 18-W adapter is designed and tested to verify the effectiveness of the proposed evaluation method and the design scheme. INDEX TERMS Common-mode (CM), flyback, EMI, planar transformer, equivalent capacitance.

show abstract

Conducted EMI Mitigation Schemes in Isolated Switching-Mode Power Supply Without the Need of a Y-Capacitor

Cited by 42 publications

References 25 publications

A Review of Integrated On-Board EV Battery Chargers: Advanced Topologies, Recent Developments and Optimal Selection of FSCW Slot/Pole Combination

A Review of Integrated On-Board EV Battery Chargers: Advanced Topologies, Recent Developments and Optimal Selection of FSCW Slot/Pole Combination

Mitigation of CM conducted EMI in flyback converter using balancing capacitors

Evaluation Method of Flyback Converter Behaviors on Common-Mode Noise

Contact Info

Product

Resources

About