220v inverters Independent inverter operating characteristics of the PVS

( 1 ) Reliability

PVS from the previous operation , the inverter is one of the main factors affecting the reliability of the system . Since independence inverter typically work in remote areas , if there 3000w charge function inverter‍ are problems maintenance inconvenient , so the first requirement is independent inverter must be safe and reliable operation .

( 2 ) Rated output capacity

In the stand-alone inverter, rated output capacity is also a very important reference factor , which indicates the load capacity of the inverter power . High values ??of rated output capacity inverter can bring more electricity load. In this particular note is that when the inverter is not purely resistive load, the load capacity of the inverter rated output capacity will be less than the value it gives .

( 3 ) inverter efficiency

Inverter improve the level of efficiency of the system and reduce the effective cost of electricity generation capacity has an important impact. Due to the current cost of solar cells is still relatively high, but there will not be much reduced in recent years , so for standalone inverters require high efficiency , Car power inverters‍  especially when low-load power , still has high efficiency, low the load is independent of the load in higher demand dedicated PVS inverters inverter is relatively common .

( 4 ) starting performance

General inductive loads , such as motors, refrigerators, air conditioners , washing machines, high-power water pumps, etc. , at the start , the power may be 5 to 6 times the rated power. Therefore, typically inductive load starting , the inverter will withstand large transient power surges . The inverter should ensure reliable starting at rated load , high-performance inverters can be done repeatedly without damaging the starter full load power solar power inverter‍ devices . Small inverters for their own safety , and sometimes requires the use of soft- start or limit start .

220 volt inverter Select the inverter power devices

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.

220 volt power inverters Multi series inverter

Multi series inverter for electric car has many advantages . Type series arrangement greatly increases the output voltage vector , enhances the flexibility to control and improve the accuracy DC AC power inverter‍ of control ; while reducing the fluctuation of the motor neutral point voltage . Inverter bypass charging characteristics can be improved flexibility and regenerative braking control .

With the growing concern for the urban environment , the development of electric cars got a rare opportunity. In urban traffic , the electric bus due to the large carrier , comprehensive benefits , become the object of priorities. Electric buses were powered by a three-phase AC motor, because the motor power, three-phase inverter device needs to withstand effects of high voltage and high current stress , high dv / dt and severe electromagnetic radiation , and the need for good cooling.

The use of multi- series structure of power inverter is a single device reduces voltage stress , reducing the device's requirements; reduce the dv / dt value , reducing the electromagnetic 24 volt power inverters‍ radiation , heating devices are greatly reduced ; due to output increase the level of species , the control performance is better.

Multi series inverter suitable for high-power electric vehicle drive system. Using multiple tandem structure , a plurality of batteries connected in series can reduce the risk that will reduce the switching device and reducing the stress of electromagnetic radiation. But the number of batteries needed increased 2 -fold.

Multiple tandem structure of the output voltage vector species greatly increased, thus increasing the flexibility of the control and improve the accuracy of control ; motor while reducing the fluctuation of the neutral point voltage . In order to maintain the balance of each set of battery power , the need to ensure a 24v bypass inverter‍ consistent runtime battery discharge time. Through the bypass mode , the flexibility to charge the battery pack , regenerative braking torque can be controlled.