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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Braking unit, the full name of "inverter-specific energy consumption braking unit", or "inverter-specific energy feedback unit", is mainly used to control the occasions where the mechanical load is relatively heavy and the braking speed is required to be very fast. The regenerative electric energy generated by the motor is consumed by the braking resistor, or the regenerative electric energy is fed back to the power supply. The main functions, advantages and action process of the braking unit are briefly introduced below.
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The working state of MOS in the controller circuit: turn-on process (transition process from turn-off to turn-on), turn-on state, turn-off process (transition process from turn-on to turn-off), turn-off state, and the main loss of MOS also corresponds to this. Several states, switching losses (turn-on and conduction), conduction losses, turn-off losses, and avalanche energy losses. As long as these losses are controlled within the tolerance specification of the MOS, the MOSwill work normally, and if it exceeds the tolerance range, damage will occur.
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When doing power supply design or driving circuits, it is inevitable to use MOS tubes. There are many types of MOS tubes and many functions. For the use of power supply or drive, of course, its switching function is used. Regardless of N-type or P-type MOS tube, its working principle is essentially the same.
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