Single-phase AC-AC AC chopper voltage regulator

　　I. Overview:

　　Traditionally, AC voltage conversion is realized by electromagnetic induction of transformer. When the input voltage of transformer changes, its output voltage also changes accordingly. Some electrical equipment also needs to use AC regulator to stabilize voltage. In some cases, the load voltage also needs to be able to adjust. At this time, adjustable transformers such as autotransformers should be used. These are commonly used methods. However, with the development of modern society and the gradual exhaustion of earth resources, in order to achieve the sustainable development of human society, the traditional transformer using a large number of precious metals such as copper and iron will gradually withdraw from the historical stage, and the AC/AC converter composed of power electronic components will replace it.

　　In the past, the bi-directional thyristor phase control method was used to regulate the step-down voltage at constant frequency. Because the thyristor is a semi-control element, such regulation will cause great voltage distortion, produce harmonics, consume reactive power and power factor variation, so it is only used in some devices with small power.

　　In order to realize AC/AC voltage conversion, in recent years, people have widely used full-controlled power electronic switches for chopper (PWM) control.

　　This product will realize AC/AC direct conversion chopper voltage regulation through one-cycle control. It can implement boost and buck regulation. It has wide practicability. The input current and output voltage waveforms are very close to sinusoidal shape. There is almost no harmonic pollution and load voltage distortion. The main circuit topology is simple, easy to achieve long life, small size, light weight, high. Effectiveness, simplicity.