What are the common types of inverters

1、 Classification by input source:

1. Voltage source inverter: The input of the inverter is a constant DC voltage source.

2. Current source inverter: The input of the inverter is a constant DC current source.

2、 Classified by output phase:

1. Single phase inverter: Converts DC input to single-phase output. The output voltage and current of a single-phase inverter are only one phase, and its nominal frequency is 50Hz or 60Hz.

2. Three phase inverter: converts direct current into three-phase power supply. A three-phase power supply provides three intersecting and uniformly separated alternating currents. All three waves generated at the output end have the same amplitude and frequency.

3、 Classified by commutation technology:

1. Line commutation: The line voltage of the AC circuit of the inverter can be obtained through the device, and when the current in the SCR experiences a zero characteristic, the device is turned off.

2. Forced commutation: In this type of commutation, the power supply will not have zero points. Therefore, some external resources are needed to rectify the equipment.

4、 Classified by connection method:

1. Series inverter: composed of a pair of thyristors and RLC circuits. A thyristor is connected in parallel with the RLC circuit, and a thyristor is connected in series with the DC power supply and RLC circuit. The load is directly connected in series with the DC power supply with the help of thyristors.

2. Parallel inverter: composed of two thyristors, a capacitor, a center tap transformer, and an inductor. Thyristors are used to provide a path for current flow, while inductors are used to keep the current source constant. The conduction and turn off of these thyristors are controlled by commutating capacitors connected between them. In working condition, capacitors are connected in parallel with the load through transformers.

3. Half bridge inverter: requires two electronic switches to operate. The switch can be MOSFET, IJBT, BJT, or thyristor.

4. Full bridge inverter: A single-phase full bridge inverter has four controlled switches used to control the direction of current flow in the load. This bridge has 4 feedback diodes that can feedback the energy stored in the load back to the power supply.

5. Three phase bridge inverter: Industrial and other heavy loads require a three-phase power supply.

5、 Classified by operating mode:

1. Off grid inverter: Off grid inverter can provide power to the load on its own without being affected by the power grid or other power sources.

2. Grid connected inverter: Grid connected inverter can provide AC power to AC loads from storage devices and additional power to the grid.

3. Bimodal inverter: Bimodal inverter can work as both grid connected and off grid inverters.

6、 Classification by output waveform:

1. Square wave inverter: The simplest inverter that converts direct current into alternating current, but the output waveform is not a pure sine wave, only having a square wave at the output end.

2. Quasi sine wave inverter: abbreviated as a corrected sine wave inverter with stepped sine waves.

3. Pure sine wave inverter: Pure sine wave inverter converts DC to almost pure sine AC, and the output waveform is much smoother than square wave and quasi sine wave inverters.

7、 Classified by the number of output levels:

1. Two level inverter: A two-level inverter has two output levels, with alternating positive and negative output voltages and alternating at the basic frequency.

2. Multilevel inverter: Multilevel inverter converts DC signals into multi-level stepped waveforms, and the output waveform of multi-level inverter is not directly positive negative alternating, but multi-level alternating.

8、 Inverters can be classified according to different standards in the following common ways:

According to the frequency of AC power output by inverters, they can be divided into power frequency inverters, intermediate frequency inverters, and high-frequency inverters.

According to the number of phases output by the inverter, it can be divided into single-phase inverter, three-phase inverter, and multiphase inverter.

According to the direction of the output energy of the inverter, it can be divided into active inverters and passive inverters.

According to the form of the inverter main circuit, it can be divided into single ended inverters, push-pull inverters, half bridge inverters, and full bridge inverters.

According to the types of main switching devices in inverters, they can be divided into thyristor inverters, transistor inverters, field-effect inverters, and insulated gate bipolar transistor (IGBT) inverters.

According to DC power sources, they can be divided into voltage source inverters (VSI) and current source inverters (CSI).

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 control method of inverters, they can be divided into frequency modulation (PFM) inverters and pulse width modulation (PWM) inverters.

According to the working mode of the inverter switching circuit, it can be divided into resonant inverters, fixed frequency hard switching inverters, and fixed frequency soft switching inverters.

According to the inverter commutation method, it can be divided into load commutation inverters and self commutation inverters.

In addition, there are other classification methods, such as whether the inverter input and output are isolated, which can be divided into isolated inverters and non isolated inverters; According to the number of output levels of inverters, they can be divided into two-level inverters and multi-level inverters.