Various types of inverters you should know

What is inverter?

The inverter is a converter that transforms DC power into a fixed -frequency fixed -voltage or frequency regulating voltage regulating AC power (generally 220V, 50Hz sine wave). It consists of inverter bridge, control logic and filter circuit. Widely applicable to home appliances, such as air conditioners, refrigerators, televisions, washing machines, range hoods, fans, electric lights, etc.


Common types of inverters

1. Classification of the output waveform:

(1) square wave inverter

(2) Steel wave inverter

(3) Snuarse wave inverter

2. Classification of the frequency of AC power output:

(1) Low -frequency inverter

(2) Industrial frequency inverter

(3) Intermediate frequency inverter

(4) High -frequency inverter

3. Different categories according to their uses:

(1)Off-grid inverter

(2) On-grid inverter

4. Classification by the load source:

(1) Active inverter

(2) Specified inverter

5. Classification according to the number of output current:

(1) Single -phase inverter

(2) Three -phase inverter

(3) Multi -phase inverters

6. Classification by power current flow

(1) One -way inverter

(2) two -way inverter

7. Classification according to the nature of input current:

(1) Voltage source inverter

(2) The current source inverter

8. Classification according to different power supply:

(1) Coal power inverter

(2) Solar inverter

(3) Wind energy inverter

(4) Nuclear inverter

Application of inverters in photovoltaic systems:

In the photovoltaic grid system, the grid -connected inverter is the core part. At present, major companies’ research on grid-type inverters is mainly concentrated in the structure of energy transformation of both DC-DC and DC-AC. DC-AC is the key design of the system. The functional frame diagram and control box diagram of the solar photovoltaic grid system inverter are shown in the figure. Generally, two -level design is adopted, the previous stage is a booster, and the rear stage is a full bridge inverter. The pre -level is used for maximum power tracking, and the rear level realizes the control of the grid -connected current. The overall control is coordinated by the DSP chip.

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