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Basic knowledge of inverters

  • 263
  • Jimmy at
  • June 25, 2018

Q: What is a inverter and what does it do?

A: Generally, an inverter is an electronic device that converts a low-voltage (dc 12V/24V/48V) dc direct current into a 220-volt ac current. Because we usually use a 220-volt ac rectifier as a direct current, the inverter works the opposite way, that’s why it calls that name. We are in a "mobile" era, mobile office, mobile communication, mobile leisure and entertainment. In a state of movement, people not only need to be supplied by batteries or battery low voltage direct current (dc), at the same time more in need of our indispensable in the daily environment 220 v alternating current (ac), inverter can meet the demand of our this.


Q: What is "emotional load"?

Answer: Popularly say, use electromagnetism induction principle to make namely the high-power electric appliance product, if motor, compressor, relay, fluorescent lamp etc. Such products require a much larger starting current (about 3-7 times) at startup than is required to maintain normal operation. For example, a refrigerator that consumes about 150 watts of electricity during normal operation can have a starting power of more than 1,000 watts. In addition, due to the perceptual load, at the moment of switching power supply or disconnect the power supply will produce "potential voltage", this is far greater than the peak voltage inverter can withstand voltage, it is easy to cause the inverter instantaneous overload, affect the service life of the inverter. Therefore, this kind of electrical appliances to power supply waveform requirements are high.


Q: What appliances can quasi-sine wave inverters 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 are only talking about square waves, which are the waveforms that most of the high frequency inverters currently on the market can provide. Such quasi sine wave inverter can be used in notebook computers, television sets, combined audio, video camera, digital camera, printer, all kinds of charger, PDA, game consoles, DVD, mobile DVD, household therapeutic apparatus, etc., the output power of the larger inverter can also be used in small electric appliances such as electric hair dryer, electric mug, kitchen appliances and so on. However, it is not suitable to use square wave inverter for long time for inductive load electrical appliances such as refrigerators and drills. Otherwise, it may damage the inverter and related electrical products or shorten the expected service life. If it is necessary to use inductive load, it is recommended to use pure sine wave inverter with large reserve power and super-large peak power inverter. Here, the pure sine wave inverter is used in television (traditional display). TV sets have the following three requirements for inverters: first, the demagnetization circuit has a great demand for electric energy in an instant when the TV is starting up, so the peak power of the inverter is very high. A 25-inch digital color TV, for example, USES about 80 watts of power at normal operating conditions, compared with 1,450 watts at the moment it starts up. Second, because the TV's field frequency is equal to the ac power grid frequency, the inverter must output ac power at an accurate frequency. Third, the inverter should not interfere with the television. Even can meet the above three conditions, the television when using quasi sinusoidal alternating current (ac), there will still be a few fixed picture interference lines, colour will be slight slant green (using old television, partial color more serious), but the other.


Q: What is the efficiency of a inverter?

A: The inverter itself consumes some power when it works, so its input power is greater than its output power. The efficiency of the inverter is the ratio of the input power to the output power of the inverter. If a inverter inputs 100 watts of direct current and 90 watts of ac, its efficiency is 90 percent.


Q: What is the continuous output power? What is peak output power?

Answer: Some use motor electrical appliances or tools, such as refrigerators, washing machines, electric drill, the current starting moment takes a lot to push, once started, it takes only a small current to maintain its normal operation. Therefore, for the inverter, there is the concept of continuous output power and peak output power. The continuous output power is the rated output power. The general peak output power is two times of the rated output power. It must be emphasized that the starting current of some electric appliances, such as air conditioners and refrigerators, is 3-7 times that of the normal working current. Therefore, only the inverter that can meet the peak starting power of the electric appliance can work normally.


Q:How to select inverter products?

A: The vehicle inverter is a power product that works in the environment of large current and high frequency. Its potential failure rate is quite high. Therefore, consumers must be cautious when buying. First, choose from the output waveform of the inverter, preferably not lower than the square wave. Secondly, the inverter should have complete circuit protection function. Third, the manufacturer should have good after - sales service commitment; Fourth, circuits and products have been tested for some time.


Q: Difference between inverter and transformer:

A: Inverter, it must be something of an inverter device then call, it has a direct difference between transformer, that is to say, it can realize dc input, output and communication, the working principle is like switching power supply, but the oscillation frequency within a certain range, such as if the frequency of 50 hz, the output of ac 50 hz. An inverter is a device that can change its frequency.

Transformer generally refers to a specific frequency equipment, such as power frequency transformer, is the transformer, we usually see their input and output must be within a certain range, such as 40 to 60 hz range can work.


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