Transformer Isolation Transformer Inverter

Product Brief:

Isolation transformers are typically designed at the output end of the inverter in inverter power supplies, which can enhance the performance of the inverter and improve the power supply quality at the load end. Generally, the output isolator of an inverter has the following four major advantages:

Filter out harmonics at the load end to improve power supply quality

The isolation transformer itself has inductive characteristics. The output isolation transformer can filter out a large amount of low-order harmonics at the load end, reduce high-frequency interference, and significantly attenuate high-order harmonics. The adoption of power isolation transformers can effectively suppress the noise interference that intruded into the AC power supply, eliminate the interference, and improve the electromagnetic compatibility of the equipment.

2) Reduce zero-ground voltage and optimize the power supply network at the end of the power source

Installing an isolation transformer on the inverter output can isolate the electrical connection between the input and output, thereby effectively reducing the zero-ground voltage of the output. As the secondary winding of the isolation transformer adopts the Y-type connection method, a new neutral wire is generated after the neutral point is grounded, thereby achieving the purpose of reducing the zero-ground voltage. In fact, the minicomputers of HP, IBM and SUN all have extremely high requirements for zero-ground voltage to ensure precise computing power and highly reliable data processing and transmission capabilities. Installing isolation transformers can completely solve the problem that technicians cannot debug due to the high zero-ground voltage.

3) "Pass AC and block DC", protecting the load in case of a fault

Modern inverter power supplies adopt high-frequency design for the AC/DC conversion part, which improves the input power factor (above 0.98) and the input voltage range. The high-frequency design of the DC/AC inverter part reduces the volume of the output filter inductor and increases the power density. As there is no output isolation transformer, once the IGBT of the inverter bridge arm is short-circuited due to breakdown, the high DC voltage of the BUS bus will be applied to the load, which will endanger the safety of the load. The output isolation transformer has the ability to "pass AC and block DC", which can solve such problems and ensure the safe operation of the load when a fault occurs.

4) Enhance overload and short-circuit protection capabilities and isolate safe loads

Due to its own characteristics, the isolation transformer is the most stable component in the inverter. During the normal operation of the inverter, if it encounters a large short-circuit current, the transformer will generate a reverse electromotive force, delaying the impact damage of the short-circuit current on the load and the inverter, thereby protecting the load and the main unit.