Junesang Lee

Altair Engineering.

This paper presents an equivalent circuit model of a LIPB (Li-Ion Polymer battery) for Hybrid Electric Vehicles (HEVs). The proposed equivalent circuit can be used to predict the charging/discharging characteristics in time domain as well as the impedance characteristic analysis in frequency domain. Based on these features, a one-cell model is esta...

This paper analyzes EM(Electromagnetic) characteristic in the high voltage connector for the hybrid electric vehicle. The connector bridges the electrical components and helps transferring electrical power and signal through it. The necessity of the high voltage and current connector development is emphasized because the hybrid electric vehicle rec...

In this paper, a modeling method for predicting the conducted emission with a current probe method is presented for a motor-drive braking system. The proposed model considers the motor driving circuit components and the measurement environment. The models of motor driving circuit component include PWM inverter circuits, 3-phase motor, PCB, heatsink...

This paper proposes a novel electrical characterization approach for a high-performance package system using an improved Partial Element Equivalent Circuit (PEEC). As the effect of interconnects becomes a pivotal factor for the performance of high-speed electronic systems, there is a great demand for an accurate equivalent model for interconnects....

This article presents an efficient model for reducing the radiated emission from digital printed circuit boards (PCBs). The presented method is based on electromagnetic (EM) simulation combined with an automation script. A given product with a PCB, especially in the automotive domain, tends to have a multi-variant model based on the main PCB design...

This material is a presentation titled "An EMI Reduction Modeling Approach of PCB & Shielding Enclosures Using Lua-based Automation" presented at DesignCon 2023, Santa Clara, CA. This work demonstrates the feasibility of reducing the radiated emission of the PCB system at the simulation level. Data show that the relative change in radiated EMI can...

In this article, we aim to present an introduction to the analysis techniques for conducted emission and radiated emission using Altair's products. Altair Engineering offers a comprehensive range of analysis software and solutions for CAE. They possess extensive expertise and provide solutions in various domains, including structural, fluid, collis...

This paper proposes a methodology to evaluate the signal integrity of PCB's signal waveforms using deep learning. The presented method includes the convolutional neural network (CNN) model which can classify automatically the result utilizing images of the high-speed signal waveform measured in the memory circuit. The conventional method is necessa...

This article proposes an efficient model to reduce the conducted emission in a motor-driven autonomous emergency braking system. Many X/Y decoupling capacitors have been employed in this system to repress the switching noises, which is a very important consideration for the reliability/safety of the system. However, the locations of the decoupling...

This presentation covers an efficient model to reduce the conducted emission in a motor-driven autonomous emergency braking system.

This paper presents a methodology of reducing conducted emission in a motor-drive braking system using binary particle swarm optimization (BPSO) algorithm-based simulation. The proposed model includes an equivalent circuit that is combined with EM simulation and the whole model has been implemented in ANSYS Simplorer. The location of X/Y decaps in...

This paper presents a methodology with which to construct an equivalent simulation model of closed-loop BCI testing for a vehicle component. The proposed model comprehensively takes the transfer impedance of the test configuration into account. The methodology used in this paper relies on circuit modeling and EM modeling as well. The BCI test probe...

In this paper, a model for a prediction of conducted emission from vehicular PMSM-drive braking system is presented. The proposed model is based on the high-frequency circuit model combined with EM simulation. The parameter for high-frequency circuit modeling is derived from the measurement as well as 3D EM simulation based on FEM. To establish mea...

This presentation covers a model for a prediction of conducted emission from vehicular PMSM-drive braking system.

In this paper, an integrated circuit model in view of motor drive system level is proposed for analyzing conducted emission (CE) that is effective in the frequency range of 100kHz ~ 30MHz. The high-frequency parameter in the model is extracted from measurement and 3-dimensional numerical simulation. The results are matched well between the proposed...

In the EV/HEV motor driving system, one of the most important elements that should be taken into account would be a battery that drives the whole system, because the rest of the circuit elements except battery have been relatively well established in the power electronics area. Because of the high frequency power harmonic noises inherent in the cir...

In this paper, we propose a design method that the crosstalk of probe connector pins satisfy the limitation of -30 dB. The parameters(inductance and capacitance) were extracted in the grid-structured probe connector pin system, and it is shown that the new parameters are easily calculated with increasing ground pin numbers using the previously calc...

In order to present that the electromagnetic compatibility standards following the frequency goes up which is based automotive electronics, in this paper, a hybrid/electric vehicle battery which reflects the frequency of the equivalent circuit model is introduced. By using this circuit modeling, the impedance characteristics can be analysed and an...

This paper presents an algorithm applied to measure scattering parameters of a Multiport device with a 2-port Vector Network Analyzer (VNA). By employing the conversion of Scattering matrix with different reference impedances at ports, data obtained from 2-port configuration measurements can be synthesized to build the full scattering matrix of thi...

This paper builds a printed circuit board to calculate the radiated emissions due to the common-mode and differential-mode currents. The calculated results agree with the measured values. Based on the calculated values, it is shown clearly that the common-mode radiations are the dominator of the radiated emissions from the device. The radiated emis...

This paper presents a novel model for the complete signal paths of a 484 pins Fine-Pitch Ball Grid Array (FBGA) package with parameters extracted from an improved Partial Element Equivalent Circuit (PEEC) method. The exact structure of coupled bonding wires with non-orthogonal elements, vias including nearby ground island, and package traces having...

The conventional vertical probe has the thin and long signal path that makes transfer characteristic of probe worse because of the S-shaped structure. So we propose the new vertical probe structure that has branch springs in the S-shaped probe. It makes closed loop when the probe mechanically connects to the electrode on a wafer. We fabricated the...

In this paper, we propose a new EBG structure that the two unit cells are connected by the bridge line in signal transmission plane. The SSN of the power plane is reduced effectively by via holes and bridge lines connecting the unit cells. The superior signal transfer characteristic is shown between the signal lines in the signal transmission plane...

his paper is a study on the analysis of EM (Electro-Magnetic) characteristics of a high-voltage vehicle connector, which plays a role in transmitting power and signals to the converter. Since the hybrid electric vehicle (HEV) uses a high voltage from 14V to 600V and a large current of 80A or more, the need for the development of a high-voltage/high...