The photovoltaic inverter is a very important device in the photovoltaic system. Its main function is to convert the direct current from photovoltaic modules into alternating current. In addition, the inverter is also responsible for detecting the operating status of components, power grids, and cables, and communicating with the outside world. , system security housekeeper and other important functions. It takes more than two years to produce a brand-new inverter, and a lot of manpower and material resources need to be invested in R&D and testing in the early stage.
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The switching process of the IGBT is mainly controlled by the gate voltage VGE. Since there is a parasitic capacitance between the gate and the emitter, the turn-on and turn-off of the IGBT is equivalent to charging and discharging the CGE. It is assumed that the initial state of the IGBT is an off state, that is, VGE is a negative pressure VGC-, and the output of the latter stage is a resistive inductive load with a freewheeling diode. So how much do you know about the definition of IGBT switching time? details as follows.
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Capacitance is a physical quantity that characterizes the ability of a capacitor to hold charge. The amount of electricity required to increase the potential difference between the two plates of a capacitor by 1 volt is called the capacitance of the capacitor. The symbol for capacitance is C. Capacitors are one of the most widely used electronic components in electronic equipment, and are widely used in DC blocking, coupling, bypassing, filtering, tuning circuits, energy conversion, control circuits, etc. Use C to represent the capacitance, and the capacitance units are farad (F), microfarad (uF), picofarad (pF), 1F=10*6uF=10*12pF
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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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