The MOSFET of the inverter works in the switching state, and the current flowing through the tube is very large, if the tube selection is not suitable, the driving voltage fluctuation is not large, or the heat dissipation of the circuit is not good, it can cause the FET to heat up.
1. The selection of the MOSFET is not suitable The MOSFET in the inverter works in the switching state, and its drain current is generally required to be as large as possible and the on-resistance is as small as possible, so as to reduce the full voltage drop of the tube, thereby reducing the tube consumption and calorific value. Consult the MOSFET manual, we will find that the higher the withstand voltage value of the FET, the greater its on-resistance, and those tubes with large drain current and low withstand voltage value, their on-resistance is generally below tens of milliohms.
2. The driving voltage fluctuation of the driving circuit is not large The FET is a voltage control device, if you want to reduce the tube consumption and reduce the calorific value, the fluctuation of the driving voltage of the gate of the FET should be large enough, and the edge of the driving pulse should be steep, so that the tube voltage drop can be reduced and the tube consumption can be reduced.
3. The heat dissipation of the MOSFET is not good Due to the large consumption of the MOSFET of the inverter, it is generally required to have an external heat sink with a large enough area when working, and the external heat sink and the heat sink of the FET itself should be closely touched (generally required to apply thermal grease), if the external heat sink is small or the touch with the heat sink of the FET itself is not close, it can cause the tube to heat up.
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Features and benefits of fiber optic sensors
Fiber optic sensors have the advantages of extremely high sensitivity and accuracy, good inherent safety, anti-electromagnetic interference, high dielectric strength, corrosion resistance, integration of sensing and transmission, and compatibility with digital communication systems.
High sensitivity
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Regulating transformer three-phase unbalance method
1. Pay attention to the reasonable distribution of three-phase load
In the distribution of three-phase loads, power operators should carefully collect and record the relevant data in the practical operation, so as to be able to guess the status of the electricity load to a certain extent.
Secondly, to be able to ...
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Introduction to sensor design tips – ifm
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How to use load cells and amplifiers – ifm
1. Wiring according to wiring requirements
2. Connect the specified size DC power supply to the transmitter.
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ifm pressure sensors are prone to problems
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ifm multifunction analogue displays
Contact display for easy reading and intuitive operation
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● Contact display and clear text for intuitive operation
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Correct use of the high-temperature pressure sensor method – ifm
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Definition...
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