EV DC-DC Converter Testing

In the rapidly evolving Electric Vehicle (EV) industry, ensuring the performance, safety, and reliability of DC-DC converters is crucial. These converters play a vital role in managing power distribution within the vehicle by transforming high-voltage battery power into lower-voltage power needed for auxiliary systems. This document introduces the EV2020B, a highly integrated solution tailored to testing needs, covering efficiency, line regulation, and load regulation testing.

Efficiency Testing: The efficiency test measures the performance of the DC-DC converter by comparing input and output power. This test is essential to determine how effectively the converter transforms the input power into usable output power. The EV2020B utilizes the Keysight RP7900 Series Regenerative Power System (RPS), which are bi-directional DC power supplies capable of acting as both a source and a sink. The RPS provides high measurement accuracy, reducing the need for additional instruments and simplifying the test setup. The efficiency test setup involves connecting the Device Under Test (DUT) to two RPS units, one acting as a source and the other as a sink, ensuring precise power measurement.

Line and Load Regulation Testing: Line regulation and load regulation tests are equally important as they assess the DC-DC converter's ability to maintain a stable output voltage despite fluctuations in input voltage or current. These tests are crucial for the reliability of components such as motors, battery management systems, and auxiliary electronics, which depend on consistent output voltage. The EV2020B employs a similar setup to the efficiency test, leveraging the built-in Digital Multimeter (DMM) of the RPS for accurate measurements. These tests simulate real-world scenarios where input voltage may vary due to factors like temperature changes, load variations, switching transients, or electromagnetic interference.

Standardized Test System: The EV2020B offers a standardized test system with a wide power coverage ranging from 5kW to 120kW. It supports automated testing using PathWave Test Executive software, including KS8400B PathWave Test Automation and KS8328B PathWave Test Executive for Manufacturing. This automation enhances testing efficiency and consistency, ensuring compliance with industry standards.

Ease of Use and Safety: Designed for ease of use, the EV2020B features accessible instrumentation via power switches rated up to 1000V and touch-safe. These switches are customizable to meet user needs, offering high voltage panels, low voltage panels, general-purpose I/O panels, and AC power panels. Safety and reliability are paramount, with built-in fixture interlock mechanisms to inhibit high voltage output during unexpected interruptions, protecting manufacturing personnel from hazardous voltages.

Regenerative Power Supplies: The document also highlights the regenerative power supplies available for integration into the EV2020B. The RP7900 Series Regenerative Power System is central to the solution, capable of bidirectional source/sink operation and returning over 85% of sink power back to the grid, reducing heat generation. Various models of regenerative power supplies are available to suit specific testing requirements, ensuring flexibility and adaptability for different manufacturers.

Robust Software Solutions: Additionally, the EV2020B is supported by robust software solutions from Keysight Technologies, including PathWave Test Executive for Manufacturing (PTEM). PTEM enhances user experience in developing automated test programs, reducing the need for users to maintain or develop test platforms. Paired with EV2010 test case libraries, PTEM further reduces development time, leveraging Keysight's expertise to accelerate market entry.

Conclusion: In summary, the EV2020B is designed to help manufacturers accelerate development and time to market for their products. Its integrated solution allows for greater standardization across global manufacturing, reducing the need for large inventories of spares and ensuring repeatability in performance and deployment.