Domestic high frequency transformation of small and medium-sized power inverter power supply problems analysis
1. Reliable
At present the problems existing in the medium and small power inverter power supply high frequency transformation mainly is low reliability. We have researched for many years, production and using instruction tells affecting the service life of high frequency transformation of small ad medium-sized power inverter power supply mainly factors list as electrolytic capacitor, photoelectric coupler and magnetic materials.
2. Efficiency
To improve the efficiency of the inverter power supply, it is necessary to reduce the loss. Loss of inverter power supply is usually divided into two categories: conduction loss and switch loss. To reduce these losses, it must be implemented on the power switch tube zero voltage or zero current switching, which adopts the structure resonance type transformation.
Photovoltaic (pv) system in medium and small power inverter development
Along with the development of the resonant switching power supply, resonance transformation thought also to be used in the inverter power supply system, which constitutes the resonance type high efficiency inverter power supply. The inverter power supply is adopted in DC/DC transform zero voltage or zero current switching technologies,can basically eliminate switch loss , even when the switch frequency after more than 1 MHZ, the efficiency of the power supply will not decrease obviousely. Experimental results showing that under the same working frequency, resonant type transformation of loss than non-resonant type transformation by 30% ~ 40%. At present, the work frequency of the resonant dc can up to 500 KHZ to 1 MHZ.
In addition, it is important to note that pv systems in the study of small and medium-sized power inverter power supply are developing in the direction of modular, adopting the combination of different modules that can constitute a different voltage, waveform transformation system.
There is no doubt that the photovoltaic (pv) systemin medium and small power inverter power supply using high frequency conversion circuit structure. On some technical details, also will use the inverter power supply is different from the other occasions, such as except the pursuit of high reliability, high efficiency, still should according to the characteristics of the photovoltaic industry, make combined control, inverter effectively, namely photovoltaic inverter power supply in design. should have overvoltage, undervoltage, short circuit and overheating, polarity reverse etc protection function.the above solutions not only reduce the cost of the system, but also improve the reliability of the system.
There is no doubt that the photovoltaic (pv) systemin medium and small power inverter power supply using high frequency conversion circuit structure. On some technical details, also will use the inverter power supply is different from the other occasions, such as except the pursuit of high reliability, high efficiency, still should according to the characteristics of the photovoltaic industry, make combined control, inverter effectively, namely photovoltaic inverter power supply in design. should have overvoltage, undervoltage, short circuit and overheating, polarity reverse etc protection function.the above solutions not only reduce the cost of the system, but also improve the reliability of the system.