Electric test equipment Ripple Emulator™

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The inverter required in electric powertrains causes a ripple on the entire DC-bus due to the switching of the transistors. This ripple can negatively affect the lifetime of a battery or alter the inner resistance and therefore also the battery’s efficiency. The ripple also influences other DC bus components such as a second inverter, an onboard charger, or heating/cooling units. It can cause the component to either cease functioning entirely or depart from their stable operating point. We have designed the new AVL Ripple Generator™ to support HV component testing and to investigate immunity to voltage ripple Why You Need a Ripple Generator The emulated currents on a testbed and the signals measured in a real vehicle are different, mostly due to the high dynamic background noise (aka ripple) of the inverters. Depending on the noise level, the lifetime of the battery may be affected, or a component may fail from its stable operation. This is why OEMs come up with specific testing standards like LV123, a testing directive, defined by European OEMs, focusing on the electrical characteristics of HV components in electric vehicles. Our AVL Ripple Generator also fulfills other standards like: LV124, LV148, VW80300, VW80303, ISO 16750, MBN11123 and ISO 21498. An Effective and Automated Test Setup The AVL Ripple Generator™ was designed to add mid-frequency AC currents with up to 250 kHz to an existing DC bus. Additionally, the AVL E-STORAGE BTE™ DC supply features an internal ripple emulator to cover the low-frequency range.