Due to the inconsistency of the parameters of the parallel IGBTs and the asymmetry of the circuit layout, it will inevitably lead to uneven current distribution of the device, and in severe cases, the device will fail or even damage the main circuit. Therefore, the focus of IGBT parallel connection is to consider how to ensure current sharing through design. At present, some existing IGBT parallel current sharing measures include: derating method, gate resistance matching method, emitter resistance feedback method, and external inductance balancing method.
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IGBT is the CPU of power electronic device and plays a pivotal role in power electronic conversion and control. In the inverter, the IGBT module is more important. However, IGBT modules often explode.
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The reliability of a power device refers to the ability of the device to complete the specified function under specified conditions, usually expressed in terms of service life. Since semiconductor devices are mainly used to realize the switching of current, which will generate large power loss, the thermal management of power electronic systems has become the top priority in the design. In the working process of power electronic devices, the first thing to deal with is thermal problems, which include steady-state temperature, temperature cycling, temperature gradient, and matching of packaging materials at operating temperature.
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Semiconductor discrete devices are the basic components of electronic circuits and are indispensable and important components in various electronic product lines. Discrete devices can be widely used in various electronic products, and their downstream application markets can be slightly divided as follows: household appliances, power supplies and chargers, green lighting, networking and communications, automotive electronics, smart meters and instruments, etc. The following will analyze the demand for semiconductor discrete device products from the downstream application market.
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The frequency converter often encounters various problems during debugging and use, among which the overvoltage phenomenon is the most common. After the overvoltage occurs, in order to prevent the internal circuit from being damaged, the overvoltage protection function of the inverter will act to make the inverter stop running, causing the equipment to fail to work normally.
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The overcurrent fault of the inverter can be divided into short circuit, light load, heavy load, acceleration, deceleration, and constant speed overcurrent. To analyze the reasons for the overcurrent fault of the inverter, two aspects should be considered: one is the external cause; the other is the inverter its own reasons. The three common types of overcurrent faults in frequency converters are as follows.
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