Photovoltaic transformer (pvt) is a key component in the photovoltaic system. it not only plays the role of isolating dc and ac, but also protects the solar cells. In practical applications, there are many types of photovoltaic transformers: single-phase and three-phase; There are parallel connection and series connection; There are also AC-DC-AC and so on. Now let's learn about photovoltaic transformers!

1. Single-phase photovoltaic transformer Single-phase photovoltaic transformer is composed of three-phase rectifier, three-phase inverter and filter inductor. The rectifier is a semi-controlled device composed of three groups of bridge-type fully controlled silicon, whose function is to convert DC power from the sun into AC power with adjustable frequency and output it to the inverter module; The inverter module converts the input AC power into a DC power supply with stable voltage for the load.

2. Three-phase photovoltaic power station Three-phase co-direction series-excited photovoltaic power station mainly consists of three identical parallel thyristors to form a unit of three-phase co-direction series-excited power electronic converter (referred to as "spwm controller"). The characteristic of the converter is to use the method of multi-channel current control to change the working state of each unit to complete the power distribution task. Fig. 2 Single-phase series excitation power electronic converter.

3. Three-phase parallel thyristor inverter circuit generally uses semiconductor devices such as igbt or ipm to achieve high-power and small volume integration and reduce loss [3]. Because these devices have the advantages of fast switching speed, high efficiency and no noise, they are widely used in various fields [4-6]. At present, the most widely used is the sic series chip. Soc transistor is an insulated gate bipolar transistor (thinfet), which has the characteristics of high operating temperature (105 ° C) and strong impact resistance. Therefore, it is widely used in various power conversion devices.

Shenzhen YLZ Technology Co., Ltd. specializes in the production of various photovoltaic transformers.