The Design Of High-power Chopper Compensation For AC Voltage Regulator

With the development of High-tech, AC voltage regulator is widely used in space technology and military technology, medical equipment, communication engineering, and a large laboratory. Electrical equipment not only on the quality of the supply of AC voltage regulator increasingly demanding, but also for the output power requirements are also increasing. Due to the traditional AC voltage regulator the presence of severe mechanical wear, working life is short, the output low accuracy, slow speed of dynamic response, weak anti-interference ability, and the load capacity is weak. It can't meet the needs of high precision electrical equipment. For the deficiency of AC voltage regulator, this paper designed a new data acquisition method base on high-power chopper compensating AC regulator.Given the accuracy of data acquisition system have a big impact on AC voltage regulator and dynamic performance. In the case sought to maximize system performance, According to the principle of equivalent area PWM control technology, we have devised a new method of data collection, This method is that the input signal to go through the conditioning circuit, and the fixed frequency triangular wave, then convert into a pulse signal PWM, while the microprocessor through a gating the timer measuring PWM pulse number of high level, so as to rapidly and accurately calculate the input signal values.In order to increase the output power, this paper USES the staggered parallel Buck technology, the microprocessor output two complementary PWM pulse signal, it controls two way communication Buck chopper circuit work under alternating sequential, then current through the switch tube that is only half of the total output current, on the basis of the switch tube type, it expanding the total output current, and improved the ability to load.This design through the data acquisition module of input voltage, output voltage, input current collection, after processing by microprocessor STM32F205 calculation, adjusting the duty cycle of the PWM pulse signal to change the size of the offset voltage, while controlling the bridge bidirectional thyristor switching sequence change compensation voltage direction, to achieve positive and negative output voltage compensation, adjust and stabilize the output voltage. AC voltage regulator also communicates with PC by the RS-485 bus, It can not only be managed remotely, you can monitor the operational status of the AC voltage regulator, Enabling digital management of AC voltage regulator.The design of the AC voltage regulator with high voltage stabilizing precision, strong anti-interference ability, dynamic response speed, big output power. Finally, the experiment was carried out on the prototype testing, from test data, the ac voltage regulator runs stably, and reached the expected design goal.