All Posts

In this test, we decided to take a different approach and evaluate a SEPIC converter that anyone can easily buy from Amazon or AliExpress. The idea was simple: instead of a carefully designed lab prototype, we wanted to see how a typical off-the-shelf module behaves in a real EMC environment. The converter was tested against the CISPR 25 standard, which is considered one of the stricter EMC standards, especially for automotive applications. In practice, many electronic device

First, the measurement setup for evaluating common-mode and differential-mode currents is defined - Common-mode current is measured using a current probe clamped around both the positive and negative conductors simultaneously. Differential-mode current is evaluated by measuring each conductor individually (positive and negative). This is the measurement setup used for current testing. CISPR 25 Class 5 limits were applied to assess the feasibility of optimizing the device and

A recurring observation during EMC validation is straightforward: if conducted emissions fail, radiated emissions will also fail in most cases. The root cause is identical — excessive high-frequency current loops and poor control of switching node parasitic. This case focuses on a SEPIC-based charger that failed conducted emission limits per CISPR 11. Figure 1: Schematic 1. Hot Loop Analysis of the DC/DC Stage The dominant emission source in a SEPIC converter is the high di/d

When we approach the task of analyzing EMC redesign case studies, it is essential to maintain a clear and methodical perspective. Electromagnetic compatibility (EMC) is a critical aspect in the development of industrial and automotive electronics, where ensuring devices operate without mutual interference is paramount. By carefully examining case studies, we can extract valuable lessons that help improve design processes, reduce time to market, and ensure compliance with stri