Basic Questions and Answers for Inverters of Yacht
1. Q: What is an inverter and what does it do?
A: Simply put, an inverter is an electronic device that converts low voltage (12 or 24 volts) direct current to 220 volts alternating current. Because we usually use 220 volt AC to be converted to DC, and the inverter has the opposite effect, hence the name. We are in a “mobile” era, mobile office, mobile communication, mobile leisure, and entertainment. In the mobile state, people not only need low-voltage DC power supplied by batteries or batteries but also need 220 VAC which is indispensable in our daily environment. The inverter can meet our needs.
2. Q: According to the output waveform, how many types of inverters are there?
A: There are two main types, one is a sine wave inverter and the other is a square wave inverter. 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 in the grid. 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. At the same time, its load capacity is poor, only 40-60% of the rated load, cannot carry the inductive load (see the following for a detailed explanation). 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 will damage the load filter capacitor of the load. In view of the above shortcomings, in recent years, quasi-sine waves (or improved sine waves, modified sine waves, analog sine waves, etc.) have appeared, and the output waveform has a time from the positive maximum value to the negative maximum value. Interval, the effect is 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 summary, sine wave 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, with high efficiency, low noise, and moderate price, thus becoming the mainstream product in the market. The square wave inverter is made of a simple multi-vibrator. Its technology belongs to the level of the 1950s and will gradually withdraw from the market.
3. Q: What is the “inductive load”?
A: In layman's terms, high-power electrical products such as electric motors, compressors, relays, fluorescent lamps, etc., which are manufactured using the principle of electromagnetic induction. This type of product requires a much larger starting current (approximately 3-7 times) than the current required to maintain the normal operation. For example, a refrigerator that consumes about 150 watts of electricity during normal operation can have a starting power of more than 1000 watts. In addition, because the inductive load is connected to the power supply or disconnected from the power supply, a counter 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. , affecting the life of the inverter. Therefore, such appliances have higher requirements for power supply waveforms.
4. Q: Which electrical appliances can the quasi-sine wave inverter be used for?
A: Quasi-sinusoidal waves are also divided into several types, from square waves that are similar to square waves to rounded trapezoidal waves that are closer to sine waves. We only discuss square waves here, which is also the waveform that most commercially available high-frequency inverters can provide. These quasi-sine wave inverters can be used in notebook computers, televisions, combination audio, camcorders, digital cameras, printers, various chargers, palm power, game consoles, DVD players, mobile DVDs, home therapy devices. And so on, the inverter with large output power can also be applied to small electric heating appliances such as hair dryers, electric cups, kitchen appliances and the like. However, it is not suitable for long-term use of quasi-sine wave inverters for inductive load electrical appliances such as refrigerators and electric drills. Otherwise, it may cause damage to the inverter and related electrical products or shorten the expected service life. If inductive loads must be used, it is recommended to use a quasi-sinusoidal inverter with a large reserve power, such as the oversized peak power inverter provided on this website. Here, focus on the example of a quasi-sine wave inverter applied to a television set (traditional display type). The TV has the following three requirements for the inverter: First, when the TV is turned on, the degaussing circuit
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