At present , the domestic photovoltaic power generation system (PhotoVoltaic Sys-tem, referred to as PVS) DC system mainly based, but the most common electrical load is AC load , 24v bypass inverter which makes photovoltaic DC power supply is difficult to popularize as a commodity . Meanwhile, the solar photovoltaic power generation can not batteries, and simple to maintain , while saving investment trends of PV . These must be AC power supply , so the inverter in the PVS also increasingly important. The inverter is a power conversion device converting the direct current into alternating current , the inverter technology in power electronics technology is more mature . For example : UPS power supply inverter , inverter technology inverter technology , special power of inverter technology and power regulator inverter technology, these have been in the form of the product to the market , and by the social widely recognized.
In the small-capacity , low- PVS , the more power 48v to 220v power inverter the device using a metal - oxide - semiconductor field effect transistor (MOSFET). Because at low pressure , with a low on-state voltage drop and high switching frequency, but with the MOSFET voltage increases , the on-state resistance increases . Thus, in the large-capacity , high-pressure PVS , in general, the use of insulated gate transistor (IGBT) as a power device ; in large capacity above 100kVA PVS , in general, the use of gate turn- off thyristor (GTO) as a power device . PVS inverter driver circuit in the main power switch for the gate drive . To get a good PWM pulse waveform , the drive circuit design is very important. In recent years , with the development of microelectronics and integrated circuit technology , have launched a number of multi-function -specific integrated chips , such as : HIP4801, TLP520, IR2130, EXB841 etc., which brings great convenience to the application 3000w charge function inverter circuit design [ 1 2 ] . Inverter control circuit commonly used mainly for driving circuit provides the required logic and waveforms, such as PWM, SPWM control signals.
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