Little knowledge about inverters - one
1. What is an inverter and what does it do?
Simply put, an inverter is an electronic device that converts low voltage (12, 24, 48 volts, etc.) direct current into 220 volts alternating current. In daily life, 220 volt AC is usually rectified into DC power. The inverter has the opposite effect, so it is called “inverter”. We are in a "mobile" era, mobile office, mobile communication, mobile leisure mobile entertainment. In the mobile life, not only the low-voltage DC power supplied by the battery or battery, but also the 220-volt AC that is indispensable in the daily environment, the inverter is enough for us.
2. According to the output waveform, the inverter is divided into several categories?
There are two main types, sine wave inverters and square wave inverters. The sine wave inverter outputs an even better sinusoidal alternating current than the grid we use every day because it does not have electromagnetic pollution. The square wave inverter outputs a square wave alternating current of poor quality, and its positive maximum value to negative maximum value are generated at the same time, which causes severe instability effects on the load and the inverter itself. In particular, the load capacity is poor, only 40-60% of the rated load, and can not carry inductive load. If the load is too large, the third harmonic component contained in the square wave current will increase the capacitive current flowing into the load, and in severe cases, damage the load filter capacitor of the load. In response to these shortcomings, there are quasi-sinusoidal waves, also called modified sine waves, modified sine waves, and analog sine wave inverters. The output waveform has a time interval from the positive maximum value to the negative maximum value. Improved, but the waveform of the quasi-sine wave is still composed of polylines, which belongs to the square wave category and has poor continuity. In general, sinusoidal inverters provide high quality AC power that can drive any kind of load, but with high technical requirements and cost. The quasi-sinusoidal inverter can meet most of our electricity demand, high efficiency, low noise and low price. It is the mainstream product in the market.
3. What is an "inductive load"?
Simply put, high-power electrical products made by electromagnetic induction, such as electric motors, compressors, relays, fluorescent lamps, etc. This type of product requires a much larger starting current (approximately 3-7 times) than the current required to maintain normal operation. For example, a refrigerator that consumes about 100 watts of electricity during normal operation can have a starting power of more than 900 watts. Since the inductive load is connected to the power supply or disconnected from the power supply, a back electromotive voltage is generated. The peak value of this voltage is much larger than the voltage that the inverter can withstand, which easily causes the inverter to be overloaded instantaneously. The life of the inverter. Therefore, such electrical appliances have higher requirements on the power supply waveform.
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