Based PWM AC Voltage Regulator Circuit

AC-AC voltage conversion, which is one of the most important part of power conversion, can be used in many areas, such as industrial heating, street lighting, energy saving, induction motor soft start, plays more and more important role in the power system design, application and manufacturing and so on. Transformer and thyristor phase control voltage regulator are always used for AC-AC voltage transformation nowadays. However, the transformers and phase control voltage regulator are hardly to apply in factory, because of the transformer's large volume, high costs and difficult to maintenance, and the regulator's large harmonic and low power factor. Furthermore, the inverter used for AC-AC voltage conversion is presented by some researchers, but the circles of inverter need twice conversion, AC-DC-AC, which result in the conversion inefficient, high costs. This shows that it is meaningful to do some research in the new AC-AC voltage conversion topology and the new circle control strategy.A new AC-AC voltage conversion topology used IGBT as one of the most major components, and the affection of AC voltage regulator circuit from one-cycle control and the PI control are described in this paper. In the first step, the voltage conversion mode and the working principle of SCR AC-AC converter, AC-DC-AC converter and high-frequency AC-AC converter are reviewed here. And the circuit system drived by complementary switch is designed and used in experimental. In the second step, to analyze the dynamic model and parameter selection of circuit based on a bilateral electronic switch control, and to design the one-phase AC voltage regulator circuit and three-phase AC Cuk circuit are described. Simulation results show that the AC voltage regulator voltage control strategy presented this paper are valid. In the third step, the principles of one-cycle control and PI control are analyzed. The simulation results of Buck AC voltage regulation circuit designed in this paper, according to the upper theory, show that both control strategies can be stable for the output of voltage regulation circuit, the response of Buck circuit under one-cycle control is faster than the PI control, comparing the two control methods. In the last step, low power prototype (input:AC 19.3V, output:AC 9V) is made in this subject. The experimental results of the prototype show that AC voltage regulation circuit based on one-cycle control is easier to implement, more stable output voltage than that circuit based on PI control. Moreover, the new AC-AC voltage regulator circuit given by this paper, is lower costs and harmonic contents, more reliable and easier to control, comparing with traditional AC-AC voltage converter.