A sine wave inverter is a kind of common inverter. Sine wave inverter is a power electronic device that can convert DC (direct current) electric energy (such as power batteries, storage batteries) into AC (alternating current). The sine wave inverter outputs pure sine wave current, it is compared with a modified wave inverter. Inverter and AC-DC converter are opposite processes. AC-DC converters or power adapters rectify will convert current into direct current, while inverters will have the opposite effect. So it is get the name.
As we all know, there are two kinds of electricity: one is direct current (DC), such as electricity from batteries and mobile phone chargers, and its waveform is a straight line; the other is alternating current (AC), which is 220V/110V for household use. The alternate means that its amplitude is periodic, with positive and negative changes. Sine wave is like a wave, rising and falling. Generally, the waveform of alternating current changes according to a sine function, so it is called a sine wave. The function of the sine wave inverter is to convert direct current (linear) into alternating current (sine wave).
Basic Structure of Sine Wave Inverter
The sine wave inverter converts DC power into AC power by controlling the on and off actions of semiconductor power switching devices (such as SCR, GTO, GTR, IGBT and power MOSFET, etc.). The circuit that controls the turn-on and turn-off of the power switch is the control circuit of the inverter. It outputs a certain voltage pulse to make the power switch in the power conversion circuit turn on and off according to a certain rule. At this time, output of the power main circuit is a specific harmonic combination, which will obtain the waveform through the filter circuit. The basic structure of sine wave inverter is shown on the following diagram.
Working Principle of Sine Wave Inverter
The function of a pure sine wave power inverter is to convert direct current into alternating current. It is composed of an inverter bridge, SPWM wave module, drive module and filter circuit. The SPWM inverter circuit is the key to pure sine wave generation. SPWM wave module generation has always been a research hotspot. SPWM is Sinusoidal Pulse Width Modulation, that is, a pulse waveform with a variable duty cycle and the PWM control technology is based on this conclusion. Perform control to the turn-on and turn-off of the semiconductor switching device, so that the output terminal will get a series of pulses with equal amplitude but unequal width. The desired waveform equivalently will be obtained by performing pulse width modulation. If the duty cycle of the pulse series is arranged according to the sine law, the output voltage can obtain a sine waveform after being filtered, and at the same time, the harmonic components in the load current are reduced. This is called sine wave pulse width modulation.
Applications of Sine Wave Inverter
- New energy utilization
New energy indicates to solar energy in a broad sense, including wind energy, water potential energy, chemical energy, etc. 
New energy sources such as solar and wind energy will become the main energy sources. Using photovoltaic cells made of semiconductor materials, these new energy sources are converted into various kinds of electrical energy through certain scientific and technological means. Sine wave power inverter technology is one of the key technologies.
A sine wave inverter is a crucial component in the efficient utilization of new energy sources. Unlike traditional inverters, which often produce a modified sine wave, a pure sine wave inverter generates a smooth and consistent AC power output. This is essential for the operation of sensitive electronics and appliances, which require a stable and clean power supply to function correctly and avoid damage.
The implementation of pure sine inverters in renewable energy systems, such as solar and wind power installations, significantly enhances their performance and reliability. These inverters convert the DC power generated by solar panels or wind turbines into AC power that can be used by household appliances or fed into the electrical grid. The pure sine wave output ensures that the energy harnessed from renewable sources is utilized efficiently and effectively, maximizing the overall energy yield.
Furthermore, the use of sine wave inverters supports the broader adoption of new energy technologies by ensuring compatibility with existing electrical infrastructure. By providing a high-quality power output that mimics the electricity supplied by the grid, these inverters facilitate the seamless integration of renewable energy systems into homes and businesses. This not only promotes energy independence but also contributes to the reduction of greenhouse gas emissions, supporting global efforts to combat climate change.
- Eliminate harmonic pollution from electric supply
Effective management of harmonic pollution can not only improve the operation quality of electrical equipment and energy conservation, but also can affect the safety of civil power. By converting the main power to the city power standard after rectification using modern inverter technology, the harmonic pollution of the city power can be purified and the safety of electrical equipment and users can be protected. The sine wave inverter is an important part of the small wind power generation system, which is responsible for converting direct current into alternating current to supply power to the load.
In addition, the use of pure sine power inverters contributes to a more stable and reliable power grid. By minimizing the introduction of harmonics into the electrical system, these inverters reduce the likelihood of power quality issues, such as voltage fluctuations and electrical noise. This not only protects individual devices but also supports the broader goal of maintaining a robust and efficient electrical infrastructure.
- Other applications
Sine wave power inverters are also widely used in many other fields, such as AC motor variable speed regulation, motor braking regenerative energy feedback, uninterruptible power supply system, induction heating, arc welding power supply, variable frequency power supply, etc.
Sine wave inverters play a crucial role in ensuring the reliable and efficient operation of electronic devices and appliances by providing a clean and stable AC power supply. Whether for renewable energy systems, backup power supplies, or off-grid living, the benefits of using a sine wave inverter are clear. By understanding the different parts of inverters and their applications, individuals and businesses can make informed decisions to meet their specific power needs and ensure the longevity and performance of their electrical devices. At the same time, Inverter Online Shop will also give corresponding suggestions to help you better choose the right sine wave inverter.
