What is the working principle of On-Grid Solar Inverters?

As a special inverter, the On-Grid Solar Inverter is usually used in applications where solar panels or small wind generators are connected to the grid. So, what is the working principle of the On-Grid Solar Inverter? In order to better understand the working principle of grid-connected solar energy, let's take a look.

The On-Grid Solar Inverter must design a boost circuit

On-Grid Solar Inverter s generally have three types of circuits

The On-Grid Solar Inverter must design a boost circuit

The On-Grid Solar Inverter converts DC power into AC power. If the DC voltage is low, it is boosted by an AC transformer to obtain a standard AC voltage and frequency. For large-capacity On-Grid Solar Inverters, due to the high DC bus voltage, the AC output generally does not require a transformer to boost the voltage to reach 220V. In medium and small-capacity On-Grid Solar Inverters, the DC voltage is relatively low., Such as 12V, 24V, it is necessary to design a boost circuit.

On-Grid Solar Inverter s generally have three types of circuits

Medium and small-capacity On-Grid Solar Inverters generally include push-pull inverter circuits, full-bridge inverter circuits, and high-frequency boost inverter circuits. The push-pull circuit of On-Grid Solar Inverters will neutralize the boost transformer. The plug is connected to the positive power supply, the two power tubes work alternately, and the On-Grid Solar Inverter is used to output AC power. Because the power photovoltaic On-Grid Solar Inverter is connected to the common ground, the driving and control circuit is simple, and the transformer It has a certain leakage inductance and can limit the short-circuit current, thus improving the reliability of the circuit. So the shortcomings of On-Grid Solar Inverters are low transformer utilization and poor ability to drive inductive loads.

The full-bridge inverter circuit of the On-Grid Solar Inverter overcomes the shortcomings of the push-pull circuit. The power transistor adjusts the output pulse width, and the effective value of the output AC voltage of the On-Grid Solar Inverter changes accordingly Because the circuit has a freewheeling loop, even for inductive loads, the output voltage waveform will not be distorted. The disadvantage of this circuit is that the power transistors of the upper and lower bridge arms do not share the ground, so the grid-connected solar inverter must use a special drive circuit or an isolated power supply. In addition, in order to prevent the common conduction of the upper and lower bridge arms, a circuit must be designed to be turned off and then turned on, that is, a dead time must be set, and the circuit structure is more complicated.

In order to produce more and better On-Grid Solar Inverters, Shenzhen sunray power Co., Ltd. applies the working principle of On-Grid Solar Inverters very well. It also conducts a large number of On-Grid Solar Inverter tests before leaving the factory to promote the company is well developed. If you are interested in On-Grid Solar Inverters, you can contact us. Our website is https://www.sunrayups.com/.