| By the development in decades in China, the original relay protection testing instrument, which has the same hardware and software level, has occupied the Chinese market. As the development of technology, the"Green Tech"has become the theme of the technology development. It is ineluctable that using switch power supply and switch amplifier to take place of linear power supply and linear amplifier as the circuit of the relay protection testing instrument.After a deep research of a mass of China and foreign papers, this passage had finished a systemic research of the relay protection testing instrument worked on"switch power supply and switch amplifier"work-mode and the digital control system. Finally, through a long-term research, we had decided to use a method called the multi-target control which is based on the ambipolar SPWM control and the PI adjustment. And the passage illuminated the working principle of the multi-target control tech clearly which is used in the area of low and medium power switch amplifier.According to the requirements of the theory research and the actual application, this passage designed the current-mode switch power amplifier experiment platform which is based on the DSP chip TMS320F2808 processor. By finishing the designs of the main circuit, the control circuit and other circuits, it supplied a hardware basis to achieving the control strategy.At the same time, we finished the design of the software and the construction of hardware, and finish the debug of the software and hardware. By measured the output wave-forms of the different input signals, we verified that the current-mode switch power amplifier based on the control strategy this passage provided can get a correct and stable current output. |
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