US2GA Discrete Semiconductor Products

Rectification has been a staple of electrical engineering since the invention of the diode more than a century ago. But with the development of semiconductor technology in recent years, not only single-phase but also more complex three-phase rectification systems have been used in power systems. Among them, US2GA, a type of three-phase rectification system, has been widely adopted due to its advantages.

Introduction to US2GA

US2GA is an abbreviation for Unidirectional (Half)–Sinusoidal (Sinusoidal) Rectification System. It is a type of voltage regulator that can convert three-phase AC power into unidirectional current with sine waveform. It is composed of a maximum of four (two are commonly used) power semiconductor bridge converter and two capacitors. It has the following characteristics.

• It can form a stable unidirectional sine wave current without calculating the phase shift of the AC power source and the calculation of the firing angle of the three-phase diode bridges.
• It can reduce the input current harmonic distortion of the bridge and does not need capacitor harmonic filters.
• It has low losses and strong overload capacity.
• It does not need to continuously adjust the output voltage, and can make full use of the three-phase source. Voltage imbalance can also be allowed.

Working Principle of US2GA

US2GA is composed of two diode bridges and two capacitors connected in series. At any time, one of the two bridges is turned on, and the other is turned off. Therefore, the two bridges are alternately enabled and disabled. The two capacitors are kept charged to a desired voltage by the two diode bridges, thereby effectively suppressing the harmonic currents, and the two power semiconductor bridges form a voltage regulator.

Application Fields of US2GA

US2GA can be widely used in power industry, automotive industry, electric vehicle industry, and mechanical industry.

• It is widely used in automotive industry, because it is able to provide the electric drive component with the stable power, and that is the reason why it has an increasingly important role in the electric vehicles.
• In electrical engineering, US2GA can be used as a power regulator. In the power system, US2GA can adjust the voltage, convert voltages and harmonics, stabilize and regulate the voltage of the transmission line, as well as charge and discharge electric energy storage systems. Electric energy storage technologies, such as ultra-capacitance, can provide more application fields for US2GA.
• In the mechanical industry, US2GA can be used to process the signal of a DC shunt machine, and form the device of vector control, etc.

Conclusion

US2GA belongs to a rectifier, and it is an abbreviation for Unidirectional (Half)–Sinusoidal Rectification System. It has the advantages of low power loss and strong overload capacity. It can be widely used in the automotive industry, electric storage, and mechanical industry for power regulation.