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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In power semiconductor devices, MOSFETs play an important role in various power conversions, especially high-frequency power conversions, with high speed, low switching loss, and low driving loss. In the low-voltage field, MOSFET has no competitors, but as the withstand voltage of MOS increases, the on-resistance increases with the power of 2.4-2.6, and its growth rate makes MOSFET manufacturers and users have to reduce it by dozens of times. Rated current to compromise the contradiction between rated current, on-resistance and cost. Even so, the on-voltage drop generated by the on-resistance of the high-voltage MOSFET at the rated junction temperature is still high. The rated junction temperature and rated current of the MOSFET with a withstand voltage of more than 500V have a high on-voltage, with a withstand voltage of 800V. The above turn-on voltage is surprisingly high, and the turn-on loss accounts for 2/3-4/5 of the total MOSFET loss, which greatly limits the application.
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Inverters are widely used in various industries, mainly because of their energy-saving and frequency conversion speed regulation functions in equipment and working conditions systems. So from what aspects does the inverter protect the motor? Let's move on.
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