SimYog Webinar on Designing for CISPR-25 in Simulation

Overview

As electronics become increasingly central to modern vehicles, EMC compliance has grown into one of the most demanding challenges in automotive development. Lighting systems — often overlooked compared to powertrain or ADAS — are a significant source of EMI, and failures discovered late in the design cycle can result in costly lab revisits, BOM changes, and program delays.

In this webinar, SimYog demonstrates how simulation can be used to front-load EMC analysis for automotive lighting, specifically focusing on boost converter-based LED drivers tested to CISPR 25 conducted emission limits. Through a detailed walkthrough of the modeling methodology, component sensitivity studies, and a live demonstration in Compliance-Scope®, the session shows how engineers can gain reliable EMC insight well before a PCB prototype is available.

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Key Topics Covered

• The automotive EMC challenge: why lighting systems are a growing EMC concern
• How EMC fits into the automotive V-cycle and the shift toward pre-compliance simulation
• Modeling boost converter LED drivers for CISPR 25 conducted emissions: source, transfer function, and system response
• 3D full-wave EM modeling of PCB, housing, and cables using the Method of Moments solver
• Datasheet-based IC models for boost converter switching behavior
• Impact of input EMI filter choices: differential capacitors, common mode chokes, and Cy capacitors
• Load cable length effects on radiated resonance and emission peaks
• Common mode vs. differential mode diagnosis to isolate root causes
• Role of housing ground connections and Cy caps in system resonance
• PWM source parameter variations (rise time) and their effect on spectral energy and emissions
• BOM optimization: using simulation to safely reduce component values without risking compliance
• Live demonstration of the full Compliance-Scope® CE setup workflow

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Who Should Watch

• EMC/EMI Engineers at Tier-1 automotive suppliers
• PCB and Hardware Designers working on automotive lighting systems
• Power Electronics Engineers designing LED driver circuits
• Automotive Validation and Compliance Teams
• OEM engineers evaluating system-level EMC risk

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What You'll Learn

• How to model a complete CISPR 25 conducted emission setup — including PCB, housing, LISN, and load cables — in Compliance-Scope®
• Why load-side cable length matters for conducted emission results and how to predict its impact in simulation
• How to separate common mode and differential mode contributions to diagnose emission failures
• How changing PWM switching characteristics interacts with system transfer function to produce different emission profiles
• How to use what-if simulation studies to optimize filter components and make smarter BOM decisions before hardware is built

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