Photovoltaic inverter Generally, the process of converting AC electrical energy...
The structure and main components of the inverter
The structure and main components of the inverter can be divided into two parts: hardware and software.
Structure and composition
The inverter is generally composed of a booster circuit and an inverter bridge circuit. The boost circuit raises the DC voltage of the solar cell to the output control voltage required by the inverter, while the inverter bridge circuit converts the boosted DC to the AC voltage of the common frequency. The inverter bridge circuit is composed of inverter bridge, control logic and filter circuit, and the key electronic component is IGBT.
Function of each circuit
In addition to the main inverter circuit, a complete inverter circuit also includes:
Input circuit: The main inverter circuit provides a stable DC voltage to ensure its normal operation.
Output circuit: the AC output of the main inverter circuit is corrected and adjusted to meet the specified quality standards.
Control circuit: the main inverter circuit provides control pulse, regulate the inverter switch on and off, in order to achieve the inverter function.
Auxiliary circuit: provides a suitable DC voltage for the control circuit and includes various detection circuits.
Protection circuit: provides over voltage, under voltage, over current, short circuit, overheating and other protection functions.
Main inverter circuit: Circuit composed of semiconductor switching devices for the conversion of electrical energy.
Hardware components
The hardware equipment of the energy storage inverter includes MPPT unit, inverter unit, charge and discharge unit, power control unit and energy management unit. These hardware units are mainly composed of various electronic components, which are mounted on the printed circuit board (PCB) by means of patch according to the circuit design diagram.
Includes DC-DC conversion circuit and PV voltage and current sampling circuit.
Includes microcontrol unit (MCU), digital signal processor (DSP) and its peripheral circuit.
Includes bidirectional DC-AC conversion circuit and output LC filter circuit.
Composed of bidirectional DC-DC circuit and output EMI circuit.
The main hardware components include power semiconductor devices (such as IGBTs, MOSFETs, power diodes), capacitors (electrolytic capacitors, filter capacitors, safety capacitors), resistors and magnetic devices (such as power inductors).
Software composition
The software part of the energy storage inverter is composed of a number of embedded software, which is stored in the MCU chip by burning. The control module and MPPT unit together form the basic structure of the energy storage inverter. Embedded software includes:
The above content describes the basic structure, components and functions of the inverter in detail, which provides a comprehensive basis for the understanding and application of the inverter.
Home energy storage product series
A lithium battery pack for home energy storage systems, which is compatible with solar panels and the sun The inverter can work together with the power grid to power household appliances, and it can also be used as a For off grid systems.
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