Factors affecting the safety of inverter IGBT modules - News - Global IC Trade Starts Here.

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When an inverter encounters abnormal operating conditions, it is essential to implement shutdown or other protective measures to ensure the safety of the IGBT module as much as possible. Several factors can affect or even compromise the safety of IGBT modules. Understanding these risks helps in implementing better protection strategies and prolonging the lifespan of the components. 1. Voltage Factors: - When the power supply voltage exceeds the safe operating range of the IGBT module, it can lead to breakdown or damage. - If the voltage is too low, the IGBT may not have enough capacity to handle the load, resulting in increased current and potential motor stalling, which can endanger the module. - Fluctuations in the power supply voltage, such as when the DC loop filter capacitor loses its capacity, can cause surges or voltage spikes that threaten the IGBT's operation. - The control voltage of the IGBT is also critical. A low driving voltage can result in under-excitation, increasing internal resistance during conduction, leading to higher power consumption and temperature rise, which may ultimately damage the module. 2. Current Factors: - Overcurrent conditions, whether light or moderate, fall into the inverse time protection area, where the response time increases as the current decreases. - In severe overcurrent or short-circuit situations, immediate shutdown without delay is necessary to prevent catastrophic failure. 3. Temperature Factors: - Mild temperature rises can be managed using forced air cooling or other cooling methods. - When temperatures reach a critical level, the system should trigger a shutdown to prevent thermal damage to the IGBT. 4. Other Factors: - Issues in the drive circuit, such as a broken negative cutoff control loop, can cause unintended triggering of the IGBT, leading to damage. - Abnormalities in the control or detection circuits can also impact performance. For example, if the reference voltage in the detection circuit drifts, it may cause incorrect protection actions, reducing the effectiveness of the safety mechanisms. By addressing these factors proactively, engineers and technicians can significantly improve the reliability and longevity of IGBT modules in various applications.