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About Stropower
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Solution
Dynamics & Transients of EV High Voltage Power Network
Dynamics & Transients of EV High Voltage Power Network
Background for HVEE (High Voltage Electrical and Electronic Components in EV & xEV High Voltage Power Network)
Electrical transients and dynamics in the network can cause electromagnetic interference, which may affect the normal operation of other electronic devices in the vehicle and external equipment. Therefore, when formulating the standard, it is necessary to consider how to limit electromagnetic interference to ensure the EMC of the entire vehicle system.
The high - voltage power network in EVs operates under harsh conditions, and components need to withstand various electrical stresses. The standard aims to ensure the reliability and durability of components through relevant tests, so as to ensure the safe and stable operation of the high - voltage power network during the entire life cycle of the vehicle.
There are many standards such as LV123, VW80300 and ISO 21498 for HVEE related tests, although ISO 21498 - 2 does not cover electrical safety (which is addressed by other standards such as ISO 6469 and ISO 17409), the electrical tests specified in the standard are closely related to safety. Abnormal electrical dynamics and transients may pose safety risks such as overheating, fire, or electric shock. Therefore, the standard indirectly contributes to improving the safety of EV high - voltage power networks by ensuring the proper electrical performance of components.
Test Conditions
* DC Supply Voltage Variation within Operational Range: Tests are conducted to evaluate the ability of components to withstand normal voltage fluctuations within the specified operating voltage range.
* Generated Voltage Slope and Immunity to Voltage Slope: Examine the voltage slope generated by the system and the ability of components to resist voltage slope changes to ensure that components can operate normally under different voltage change rates.
* Generated Voltage Ripple and Immunity to Voltage Ripple: The ripple characteristics of the generated voltage are tested, and the ability of components to resist voltage ripple is evaluated. Voltage ripple may cause additional losses and heating in components, affecting their performance and life.
* Overvoltage and Under Voltage: Components are subjected to overvoltage and under - voltage tests to verify their ability to withstand abnormal voltage conditions without damage or malfunction.
* Voltage Offset: Tests are carried out to assess the impact of voltage offset on component performance.
* Generated Load Dump Voltage and Immunity to Load Dump Voltage: The load dump voltage generated during the operation of the high - voltage power network is simulated, and the ability of components to resist load dump voltage is tested. Load dump transients can produce high - voltage pulses, which may damage components.
High Voltage Power Network of EVs & xEVs
- Schematic example of the actual HV loop in vehicle. (There might be differences between systems and HV units)
- Voltage Dynamics & Transients exist because of different operation loads such as MCU PMU AC PTC Pumps ... etc.
- Main Standards in place for HVEE tests (exampled with voltage ripple)
- Example of Ripple Test
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