Inverter, also known as inverter power supply, is a power conversion device that can convert 12V or 24V direct current into 240V, 50Hz alternating current or other types of alternating current. The AC power it outputs can be used for all kinds of equipment, which can meet the needs of users in mobile power supply places or areas without electricity to the greatest extent. With an inverter, direct current (battery, switching power supply, fuel cell, etc.) can be converted into alternating current to provide stable and reliable power supply for electrical appliances, such as notebook computers, mobile phones, digital cameras, and various instruments. The inverter can also be used in conjunction with the generator, which can effectively save fuel and reduce noise. In the field of wind energy and solar energy, inverters are even more essential. Small inverters can also provide AC power in the field using cars, ships, and portable power supplies. The working principle of the inverter The inverter is composed of three parts: inverter circuit, logic control circuit and filter circuit, mainly including input interface, voltage start circuit, MOS switch tube, PWM controller, DC conversion circuit, feedback circuit, LC Oscillation and output circuit, load and other parts. The control circuit controls the operation of the entire system, the inverter circuit completes the function of converting from direct current to alternating current, and the filter circuit is used to filter out unwanted signals. The work of the inverter circuit can also be refined as follows: first, the oscillation circuit converts the DC power into AC power; second, the coil boost converts the irregular AC power into a square wave AC power; finally, the rectification turns the AC power into a sine wave AC power through a square wave .
Classification of Inverters
- According to the frequency of AC power output by the inverter, it can be divided into power frequency inverter, intermediate frequency inverter and high frequency inverter.
- According to the number of phases output by the inverter, it can be divided into single-phase inverter, three-phase inverter and multi-phase inverter.
- According to the direction of the output power of the inverter, it can be divided into active inverter and passive inverter. 4. According to the form of the main circuit of the inverter, it can be divided into single-ended inverter, push-pull inverter, half-bridge inverter and full-bridge inverter.
- According to the type of inverter main switching device, it can be divided into thyristor inverter, transistor inverter, field effect inverter and insulated gate bipolar transistor inverter. 6. According to the DC power supply, it can be divided into voltage source inverter and current source inverter.
- According to the waveform of inverter output voltage or current, it can be divided into sine wave output inverter and non-sine wave output inverter.
- According to the inverter control mode, it can be divided into frequency modulation inverter and pulse width modulation inverter.
- According to the working mode of the inverter switching circuit, it can be divided into resonant inverter, fixed frequency hard switching inverter and fixed frequency soft switching inverter.
- According to the inverter commutation mode, it can be divided into load commutated inverter and self-commutated inverter.