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Based on two-probe inductive coupling and two-port cascade network theorem, in-circuit impedance extraction of primary of operational transformer has been discussed and validated. The importance of this approach is to overcome drawbacks in existing on-line Frequency Response Analysis (FRA) which is used to monitor impedance of the transformer winding to detect movement or deformation of transformer...
There are two commonly used 3-phase configurations in power grid applications, the 3-phase 3-wire, and 3-phase 4-wire configurations. The 3-phase 4-wire power converter systems is necessary to supply single-phase loads but at the expense of higher output harmonics and losses, as compared to 3-phase 3-wire systems. The neutral inductor is added to reduce the neutral line harmonics and a LCL+ L filter...
The performance of the electromagnetic interference (EMI) filter under the condition without the Une impedance stabilization network (LISN) are revealed and analyzed from the perspective of the common mode (CM) and differential mode (DM) impedances of the switched-mode power supply (SMPS), AC mains, and LISN. The in-circuit CM and DM impedances of the SMPS, AC mains, and LISN are extracted with an...
A method to estimate the frequency spectrum of IC power supply by measuring transient voltage on Power Distribution Network (PDN) was proposed in this work. The proposed method was validated through measurement on a testing board with three clock driver ICs. The result show good agreement between the estimated current spectrum and measured current spectrum at the major spikes.
The high power density converter (HPDC) in more electric aircraft gains more and more attention. However, HPDC is one of the main harmonics and electromagnetic influence (EMI) sources in aircraft network. To improve power density of HPDC, different levels with power converter includes 2-level, 3-level, and 5-level configurations will be investigated. Besides, two 3-phase power grids such as 3-phase...
High power density converter (HPDC) is important for more electric aircraft (MEA) applications, and high power density EMI filter is essential in HPDC systems, which suppresses EMI to meet the electromagnetic compatibility (EMC) requirement. Common mode choke (CMC) is a critical component of the EMI filter. Due to higher core loss and harsh operating temperature environment, thermal analysis of CMC...
Depending on the PCB fiber weave style, electrically long differential microstrip signal traces may introduce significant signal skew due to weave effect that deteriorates the signal quality. As closed-form expression for the effective permittivity that includes the weave effect is not readily available, full-wave method is often used to study the weave effect. As such, a novel analytical method is...
Optimized common-mode (CM) filter design requires accurate knowledge of both the noise source and the termination impedances. In this paper, an in-circuit impedance extraction method is employed to determine CM impedance of a motor drive system. The CM impedance extracted allows systematic CM filter design without a trial-and-error approach.
Based on inductive coupling approach, an on-line impedance frequency response method is proposed for early detection of defects in induction motors. Using a 4-pole induction motor as a system-under-test, the proposed method is validated experimentally through emulated inter-turn and shorted coil. Statistical indicators are also introduced for better detection of faults in the motor. As the setup has...
The reliability of power converters has become a major design concern especially for those mission-critical industrial and aerospace applications required to operate in a harsh environment. There is a need for real-time monitoring techniques that are capable of tracking health status to give an alert signal before a disastrous system failure and furthermore make the early failure prediction due to...
The weight of the LCL filter is a major contributor of the total weight of a high power converter, especially the inverter-side inductor. The design of the inverter-side inductor requires multi-domain optimization in electromagnetic design, weight reduction, and thermal management with the objective of meeting power quality standards. In this paper, the inverter-side inductor, based on Amorphous core...
Inverter-generated high-frequency common-mode voltage and resultant common-mode current cause premature motor bearing failure; hence, high-frequency simulations of induction motors exposed to common-mode voltage are presented to gain insights into the motors' common-mode behavior. In addition, electrical discharge machining, one of the mechanisms responsible for bearing degradation, is modeled by...
This paper presents the benefits of interleaving three phase voltage source converters (VSCs) to improve the power density. The output harmonics are also analyzed in frequency domain, then design and optimization of coupled inductor and output filter are given. Verifications are carried out through electrical circiut and electromagnetic's FEM simualtions. Finally, the inductor weight are compared...
A method on developing pre-layout PDN model utilizing 3D full-wave simulation was proposed in this work. The proposed method divides the PDN into different blocks and obtains the network parameters of each block using 3D full-wave simulation. The proposed method was validated with post-layout simulation. Results show that PDN impedance obtained from pre-layout PDN model developed using proposed method...
Electrically long differential signal traces may introduce significant signal skew due to weave effect that deteriorates the signal quality. As serial data link pushes towards higher data transfer rate and yet the length of the signal trace has not reduced, the weave effect will become significant. Full wave method is often used to study the weave effect, however, the computational time is expensive...
The harmonics and electromagnetic interference (EMI) generated by grid-connected power converter have to be well filtered by a passive filter to achieve electromagnetic compatibility (EMC). This paper evaluates the performance of two different winding methods of a LCL filter in a grid-connected high power density converter (HPDC) for the purpose of power quality control and EMI suppression. The foil-would...
Power quality and electromagnetic interference (EMI) control are mandatory for any grid-connected power converter. This paper describes a procedure for LCL filter design in a grid-connected high power density converter (HPDC) with the objective to meet both power quality and EMI requirements. The performance of the LCL filter is simulated and then validated experimentally.
With increasing consumer's demand and technological advancement for automotive electronic systems, it is becoming a challenge to ensure good compliance for high speed design (signal and power integrity) and electromagnetic compatibility. In this paper, the effects of high frequency switching noise from an automotive cluster coupling into a TFT display module, causing undesirable radiated emissions...
This paper presents the extraction of common mode (CM) and differential mode (DM) inductances of a common mode choke (CMC) using 3D finite element method (FEM). For optimal performance of the CMC, the effects of CM and DM currents on the magnetic core saturation are investigated. As the parasitic capacitance of a CMC is a critical parameter that affects its high frequency performance, the parasitic...
Common mode (CM) and differential mode (DM) conducted emissions without the line impedance stabilization network (LISN) is investigated from the perspective of CM and DM impedances. Using a switched-mode power supply (SMPS) as an equipment under test (EUT), the in-circuit CM and DM impedances of the actual measurement setup with and without LISN are extracted so that the deviation of conducted emission...
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