Home

Low frequency UPS technology appeared in the 70s of last century, its rectification frequency and work frequency is the same. Limited to the development of semiconductor technology, the breakdown voltage of IGBT in inverter can only achieve 600V, so the bus voltage is limited, the output voltage of the inverter can not achieve 380V; and the low frequency inverter is the full bridge circuit, the output for the three-phase line, unable to meet the demand of single-phase IT load and four wire and three-phase load, must be Δ-Y conversion. In order to solve these problems, the manufacturers add the transformer in the low frequency inverter output side to elevated the voltage and generate the central line, so that the to meet the requirements of the output voltage of the load, which is the real purpose of the low-frequency built-in transformer.

By the 90s of the last century, the third generation trench IGBT was invented, its ability to enhance the withstanding voltageto 1200V, prompting the innovation of UPS technology. The bus voltage is increased to 700V through the rectifier side high frequency boost circuit, the output voltage of the inverter can be 380V, and the output transformer is canceled. And this rectifier inverter circuit works in the high frequency (several kHz or more) and no output transformer is called high frequency intelligent UPS.

1.Industrial workshop: especially in the large electricity consumption and expensive electricity fees factories, usually the roof area is large, wide flat roof, suitable for installation of photovoltaic arrays and due to the large load, distributed solar power system can do to offset part of local consumption, online consumption, thereby saving electricity.

2.Commercial buildings: it is similar to the effect of industrial workshop, the difference is that the commercial buildings is mostly cement roof, more favorable to install photovoltaic array, but often have the aesthetic requirements of the building, in accordance with the characteristics of commercial buildings, office buildings, hotels, conference centers, resorts and other buildings, the characteristics of the loads generally showed higher in daytime, while the night is low, can better match the photovoltaic characteristics.

3.Agricultural facilities: there are a large number of usable roof in rural areas, including its own residential, vegetable greenhouses, fish ponds and so on, the countryside is often at the end of the public grid, poor power quality, the construction of distributed outdoor solar power system can guarantee the electricity and power quality.

4.Public buildings: as a unified management standard, the load and business behavior is relatively reliable, high installation enthusiasm, municipal and other public buildings is also suitable for the distributed solar power system.

5.The remote areas and islands: due to far away from power grid, remote agricultural and pastoral areas in China such as Xinjiang, Tibet, Qinghai, Inner Mongolia, Gansu, Sichuan and other provinces as well as Chinese coastal islands, there are millions of people without electricity, PV system or complementary with other energy micro grid power system is very suitable for application in these areas.

SSP3111C 1-2KVA High frequency Off-grid Solar Power Modified Sine Wave Inverter

11-13 April, KICC, Nairobi, Kenya
Hall 1, Booth NO.:B175a

At present, the efficiency of solar cell is relatively low, and can produce a small amount of electricity.Now, scientists have created a new solar hybrid inverter system that can make full use of the full spectrum solar radiation. This means that hybrid solar cells can not only convert solar energy into electrical energy, but also convert the heat into electrical energy.

The new hybrid solar panel system produces 5 times higher voltage than other hybrid solar inverter systems. In order to build a brand new hybrid solar panel, the researchers used the polymer called PEDOT, the researchers laid a dye-sensitized solar cell on the PEDOT film, PEDOT film can heat due to light. In the bottom of the PEDOT layer, scientists added thermoelectric thin films and a thermoelectric element, can convert heat into electricity.

The components that work together are 20% more efficient than a single solar cell, which generates enough power to drive LED lights and electronic displays.

SSP3119C 1-5KVA On/off Grid Hybrid Solar Inverter with Energy Storage

Pulse width modulation (PWM) is a very effective technique for the control of analog circuits based on the digital output of microprocessors, it is widely used in many fields, such as measurement, communication, power control and transformation

Pulse width modulation is an analog control mode, according to the corresponding changes in the load to the base of the transistor bias modulation or MOS tube grid, to achieve a transistor or MOS tube turn-on time of change, so as to realize the switching power supply output change. In this way, the output voltage of the power supply can be kept constant when the working condition is changed. It is a very effective technique to control the analog circuit by the digital signal of the microprocessor.

With the advantages of simple control, flexible and dynamic response, PWM control technology has become the most widely used control method of power electronics technology, and it is also the focus of research. Because of the development of science and technology, there is no boundary between disciplines, and the combination of modern control theory or the realization of non resonant wave switching technology will become one of the main development directions of the PWM control technology. According to the change of the corresponding load, the bias of the transistor base or the MOS tube grid is modulated to realize the change of the turn-on time of the transistor or the MOS tube, so as to realize the change of the output of the switching voltage stabilized power supply. In this way, the output voltage of the power supply can be kept constant when the working condition is changed. It is a very effective technique to control the analog circuit by the digital signal of the microprocessor.

SSP3111C 1-2KVA Modified Sine Wave Solar Power Inverter For Home With PWM Solar Charge Controller