First, what is the inverter conversion efficiency of the whole machine?
The efficiency of the inverter is the conversion of the inverter DC power into AC power ratio. That is how much input of the inverter through the internal inverter, and then part of the filter output to the grid between the AC power of a ratio. However, the conversion efficiency of inverter is always less than 1. It means that the inverter circuit and related devices have a certain loss and need to consume part of the energy. So the output power will be smaller than the input power. Machine conversion efficiency Mathematical expression formula: inverter conversion efficiency = inverter output power / inverter DC input power × 100%.
Second, the inverter conversion efficiency standards
Because the inverter has a certain loss and in order to give customers greater benefits, so the national standards and enterprise standards are given a machine conversion efficiency limit, so as to regulate the inverse market and ensure the best interests of customers. This limit is not given blindly, but by a precise calculation and a large number of tests and a numerical value. For transformers with transformer conversion efficiency of not less than 94%, no transformer inverter conversion efficiency of not less than 96%. But enterprises in order to market competition, so have to improve their product conversion efficiency.
Third, how to improve the inverter conversion efficiency
Throughout the inverter main circuit for a transformer inverter, the main circuit is mainly DC filter (or DC filter circuit), IGBT (or other inverter module), reactor, transformer, AC filter (Or self-made filter circuit) and wire. So we in order to improve the conversion efficiency of the inverter, you can start from these aspects. Such as: 1. IGBT. We can reduce the IGBT loss, reduce the IGBT switching frequency, but can’t be reduced indefinitely. Because when reducing the switching frequency, the inverter out of the waveform will be worse, the power quality will be reduced, and Will increase the noise of the transformer, so only the appropriate to reduce the switching frequency of the IGBT; 2. Transformer loss. The loss of the transformer only its own copper loss and iron loss. We will reduce these two losses. the inverter Conversion efficiency will be improved. 3. Reactor loss. improve the reactor Q value, which is to reduce the reactor resistance. So there are many ways to improve the efficiency of the inverter conversion. We believe that experts in this area will have a lot more effective way to improve the efficiency of their products.