Patent of solar direct-drive refrigerator

You're talking about a photovoltaic direct-drive inverter centrifuge! This centrifuge has a large initial investment, and it is used in large shopping malls, buildings and hotels, not for home use. However, the household one will be listed soon, which is called photovoltaic enthalpy-increasing double-machine parallel connection and multi-connection. In fact, the principle is very simple, that is, the solar cell array is arranged on the roof, and the solar cell converts light energy into electric energy through photoelectric effect, and then the electric energy directly enters the IGBT inverter after voltage stabilization and filtering, and finally drives the compressor to work.

This centrifuge has two disadvantages:

1. The price of solar cells is still relatively high, and the initial investment is huge.

2. The service life of solar cells is only about 15 years, and the conversion efficiency is not high.

Technical breakthrough of Gree photovoltaic centrifuge:

1. The complete power management technology can directly connect the solar cell with the inverter in parallel, and the high-precision control is difficult, especially the running current of the compressor is about 600A, which puts high demands on the heat dissipation design and the voltage resistance selection of each component.

2. When the sun suddenly darkens or is blocked by clouds, it is also a big difficulty to start the standby power supply system in time to compensate.

3. When the generated electric energy is too much, it is also a big difficulty to feed it back to the power grid in time and accurately synchronize with the frequency and phase angle of the power grid.

4. The inverter it uses should support AC/DC, DC/AC and DC/DC at the same time, which is a great test for the design of inverter rectifier and inverter module.

In fact, this product is difficult to sell. Although Gree has used it and a few customers have ordered it, it is still a niche after all. It's a concept product! Gree wants to show off how NB his technology is. I will make all the future products. How can you compare with me and prove that you have mastered the core technology