Pure sine wave inverter and modified sine wave inverter are two common types of inverters, which differ in output current waveform and electrical performance. The following is a detailed introduction to the differences between these two inverters.
Pure sine wave inverter
A pure sine wave inverter refers to an inverter whose output current waveform is completely in line with the sine wave. It can convert the power of a DC power source (such as a battery or solar cell) into AC power, providing stable AC power for home, commercial and industrial equipment. The output current waveform of a pure sine wave inverter is of high quality, and it can achieve low harmonic distortion when interfacing with the grid power supply.
Pure sine wave inverters have the following characteristics
Good output waveform quality: The output voltage waveform quality of a pure sine wave inverter is very high, almost comparable to that of a mains power supply. This is very important for some equipment that has high requirements for power quality (such as high-precision instruments, frequency converters, motors, etc.).
Stable electrical performance: A pure sine wave inverter can provide stable output voltage and frequency, with low voltage fluctuations and frequency errors. This makes pure sine wave inverters very suitable for devices and systems that require high power stability.
Wide range of applications: The output waveform of pure sine wave inverters can meet the power supply requirements of most electronic devices and can be used in various occasions such as home, commercial and industrial applications.
Modified sine wave inverter
The modified sine wave inverter is an inverter with an output current waveform close to a sine wave, but compared with the pure sine wave inverter, its current waveform has a certain distortion. The modified sine wave inverter achieves waveform control by controlling the conduction and cutoff time of switching elements such as thyristors and transistors.
The modified sine wave inverter has the following characteristics
The output waveform is more distorted: The output waveform of the modified sine wave inverter is more distorted than that of the pure sine wave inverter. Generally, the waveform of the modified sine wave inverter contains more harmonic components, which may cause interference to some induction motors, audio equipment, inverters, etc.
Relatively low efficiency: Due to manufacturing costs and technical limitations, modified sine wave inverters are generally less efficient. Their conversion efficiency is usually between 80% and 90%, which is slightly lower than that of pure sine wave inverters.
Limited scope of application: Due to the large distortion of the output waveform of the modified sine wave inverter, its scope of application is relatively narrow. Generally, this inverter is suitable for some relatively low-requirement devices, such as TVs, computers, lamps, etc.
In summary, there is a clear difference between pure sine wave inverters and modified sine wave inverters. The output waveform of the pure sine wave inverter is of high quality, stable electrical performance, and has a wide range of applications, which can meet the power supply requirements of most devices. However, the output waveform of the modified sine wave inverter is of poor quality, relatively low efficiency, and limited scope of application. Therefore, when choosing an inverter, it is necessary to choose according to the specific application requirements and equipment requirements.
