PSM digital circulation controller based on FPGA (Field Programmable Gate Array) and control method thereof

Abstract

The invention relates to a PSM digital circulation controller, in particular to a PSM digital circulation controller based on an FPGA (Field Programmable Gate Array) and a control method thereof. The controller comprises an audio signal processing unit, a control unit and an M bit shift register, wherein the audio signal processing unit, the control unit and the M bit shift register are built from the FPGA, the audio signal processing unit equally divides audio signals according to the time and converts the audio signals into direct current superposed audio signals to be sent to the control unit, the output of the control unit is connected with the M bit shift register, and the control unit controls the M bit shift register according to a time sequence and a direct current superposed audio signal amount to send closing and opening signals of a control switch module of 1 or 0 according to sequences of closing and opening firstly as well as opening and closing firstly. The PSM digital circulation controller is realized by adopting the FPGA through a software, has high signal processing accuracy and is realized by using a software algorithm to replace hardware, thereby enhancing performance indexes of a launcher, miniaturizing a hardware system, enhancing the system reliability and being beneficial to upgrading and networking the system.

Description

technical field [0001] The invention relates to a PSM digital circulator, in particular to an FPGA-based PSM digital circulator and a control method thereof with functions of automatic monitoring and troubleshooting of switch modules. Background technique [0002] Improving the overall efficiency is the development trend of high-power broadcast transmitters. For transmitters with a power level above 100kW, the overall efficiency has reached about 70%, which is mainly due to the pulse step modulation (PSM) technology developed in the 1980s. The high-power broadcast transmitter amplifies the input audio signal, and performs plate modulation at the high-frequency final stage, so that the carrier amplitude changes according to the input signal, and then transmits it through the antenna. figure 1 It is the schematic diagram of the PSM transmitter. The carrier signal from the exciter is sent to the grid of the final stage electron tube, and the plate modulation voltage of the high...

AI Technical Summary

Problems solved by technology

The existing technology is implemented by analog devices. Due to the processing delay error brought by the hardware device itself, it is difficult for the loop controller to accurately meet the requirements of high-speed timing, which has become a bottleneck restricting the performance of the whole machine.

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