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Transformer is an important common mode (CM) noise coupling path in isolated power converters. But the EMI behavior of transformer is difficult to predict because of the complicated high frequency parasitics. This paper proposes a transformer Common-mode (CM) noise coupling path modeling approach based on multiconductor transmission line (MTL) theory. The MTL model can include the complicated magnetic...
At present, Y capacitor is widely adopted inside an isolated switched mode power supply to pass EMI tests. However, to meet certain safety standard, engineers are trying to reduce the Y-cap in such equipment as cell phone and pad chargers, medical instruments, handheld and portable equipment. As we know, the removal of Y-cap offers a big challenge for the EMI design. To solve the problem, this paper...
Due to the interaction between human and the power supply equipment, more and more Switch-mode power supplies (SMPS) require lower leakage current. In the AC-DC SMPS, the leakage current is mainly caused by the Y-capacitors. It is better to remove the Y-caps in this situation. But connecting Y-caps between the primary return line terminal and the secondary return line terminal is a very common method...
Switched mode power supply (SMPS) is used in majority of portable devices and plays the central role for energy-efficient power management. Recent developments in digital VLSI allow high performance control implementation with ultrafast recovery and high power density. However, electromagnetic interference (EMI) is a major concern in SMPS, which interferes with nearby devices and input power lines...
This paper presents an improved phase leg power loop design for enhance mode lateral structure Gallium Nitride (GaN) transistors. Static characterization results of a 650V/30A GaN transistor are presented to determine the design parameters of the gate driver circuits. The control of Common Mode (CM) noise current propagation is considered during the gate driver design by optimizing the power distribution...
High frequency is the major catalyst for size reduction in the advancement of power conversion technology. It is essential to understand the EMI characteristic of high frequency converter since the EMI filter typically occupies one third of total system volume. This paper presents an insight view of CM/DM noise transformation in Flyback converter for low power adapter applications. The so-called mixed-mode...
The adoption of silicon carbide (SiC) MOSFETs in variable speed motor drives makes it possible to increase the inverter switching frequency up to several hundred kilohertz without incurring excessive inverter loss. As a result, the harmonic currents and related losses in the machine can be significantly reduced, and the dynamic performance of motor will also be improved. However, the increased switching...
Electromagnetic emissions of a 1.2kV, 120A SiC-based half-bridge switching at 100kHz that includes grounding paths and that can be extended to a 100kVA inverter and, eventually, systems of paralleled and cascaded inverters suitable for shipboard and solar farm applications is studied. This switching pole forms the basis of a test platform specifically designed to discover sensitivities to resonant...
LLC resonant converters have gained popularity in a variety of applications due to their natural ability to provide soft switching conditions. Although LLC features good efficiency, conductive losses in the output rectifier remains a barrier to achieve enhanced efficiency, specially for high output current applications. This paper introduces a new strategy referred to as Coordinate Modulation, which...
As many industries look to wide bandgap (WBG) devices to replace Si devices in power applications, their effects on the power converter need to be first understood in full. While the benefits of WBG devices are widely known, including high switching frequency operating capability, the special characteristics of these new devices have the potential to cause other issues, in particular electromagnetic...
In power electronics system, high frequency range CM noise suppression is a great challenge on the issue of conducted EMI. People may think that a perfect EMI filter with little self parasitics and mutual parasitics would suppress HF noise well. However, it will be shown that the practice story is different. In this paper, besides the parasitics in EMI filter, some other factors which increase the...
Digital high-frequency arc welding inverter is widely used in welding areas because of its many advantages such as high efficiency, small size, easy to control etc. However, with the development of high frequency of the switching, the conducted EMI generated by arc welding inverter becomes increasingly serious, especially common mode conducted EMI. Based on Digital Active EMI Filter (DAEF) controller,...
Digital Active EMI Filtering (DAEF) technique is a new direction of conductive EMI suppression technologies for switched-mode power converters. However, the conventional DAEF topology only suppresses EMI to ground on the AC (or DC) ports. It doesn't definitely aim to Common Mode (CM) or Differential Mode (DM) EMI. In this paper, a novel DAEF topology is proposed. It can flexibly suppress CM and DM...
MOSFETs built using wide band gap (WBG) materials offer numerous benefits to power electronic circuits. These benefits are quite apparent in applications requiring breakdown voltages ≥ 600V, where Silicon IGBTs are typically used due to their combination of high breakdown voltage and low conduction losses. Compared to Silicon IGBTs, WBG MOSFETs offer very short turn-ON and turn-OFF times, which reduce...
This paper explores the multi-disciplinary design challenges in building a 240 VAC, 2 kVA modular single-phase inverter with high power-density using wide-bandgap transistors. The compromise between the electrical and mechanical design is extremely important in any high-density power converter. In this work the electrical and mechanical systems were iteratively co-designed using detailed 3D thermal...
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