As we all know, silicon wafer is the basic material for manufacturing semiconductor devices and chips, and plays a pivotal role in the industry. It can be said that silicon is the most important and widely used semiconductor material today.
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The field effect tube of the inverter works in the on-off state, and the current flowing through the tube is very large. If the tube selection is not appropriate, the driving voltage amplitude is not large enough, or the heat dissipation of the circuit is not good, the field effect tube may heat up.
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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. When analyzing 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.
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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.
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According to the equivalent circuit diagram of the IGBT, if a positive driving voltage is applied between the gate G and the emitter E of the IGBT, the MOSFET is turned on, so that the collector C and the base of the PNP transistor are in a low resistance state, which makes the The transistor is turned on; if the voltage between the gate and the emitter of the IGBT is 0V, the MOS is turned off, and the supply of the base current of the PNP transistor is cut off, so that the transistor is turned off. IGBT, like MOSFET, is also a voltage-controlled device. A DC voltage of more than ten V is applied between its gate G and emitter E. Only the leakage current at the uA level flows, and basically no power is consumed.
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It is often encountered that the MOSFET on the power supply board cannot work normally. First of all, it is necessary to correctly test to determine whether the MOSFET fails. Then the key is to find the reason behind the failure and avoid making the same mistake again. This article has sorted out several common causes of MOSFET failure. and specific measures on how to avoid failure.
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