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A DSP-Based Current Loop Digitization Method

A technology of current loop and current loop, which is applied in the field of tracking radar servo system, can solve the problems of complex control circuit and poor versatility, and achieve the effects of reducing sensitivity, improving sampling rate, good dynamic performance and stability

Active Publication Date: 2020-04-28
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The analog current loop needs to design a special A / D sampling circuit and correction circuit, and realize the control law through the operational amplifier. The control circuit is complex and the versatility is poor, and the control effect will be affected by device performance and temperature factors.

Method used

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  • A DSP-Based Current Loop Digitization Method
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  • A DSP-Based Current Loop Digitization Method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0021] The digital difficulty of the current loop lies in the design of the digital controller. The work of the digital controller in the servo system is to input data in real time, perform real-time calculation, processing, logical judgment and storage according to the control law of the servo system, and finally output data in real time. These tasks need to be completed within a very short sampling period (generally a few ms), requiring the processor to process various signals of the servo system in real time.

[0022] The invention uses a new type of DSP chip TMS320F28335 to realize the digitalization of the current loop, and the collection of the armature current signal, the generation of the current loop error and the digital correction are all completed in the DSP.

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Abstract

The invention provides a DSP (digital signal processor)-based current loop digitization method. The method comprises the following steps: firstly establishing a digital current loop mathematical model, then sampling an armature current signal, measuring natural frequency characteristics, and finally designing a digital controller. According to the method provided by the invention, a digitized current loop controller is designed by taking a high-performance DSP as a core, the hardware design is greatly simplified, and the reliability is improved; and high-speed and real-time operational capability of the DSP creates conditions for application of complicated and effective control algorithms, and engineering application realization of an advanced control theory is facilitated.

Description

technical field [0001] The invention relates to a current loop digitization method, which is mainly used in a tracking radar servo system. Background technique [0002] Today's radar servo systems mostly use a three-loop nested control structure of current loop, speed loop, and position loop in terms of control methods. The current loop is the innermost loop and plays a central role in the servo system, and its rapidity has the most direct impact on the rapidity of the entire system. From the mathematical model of the motor, it can be known that the input current of the servo system is directly related to the output torque of the motor. The current loop makes the current quickly follow the change of the output of the outer loop regulator, so that the servo system has a large enough acceleration torque. Therefore, The quality of current control directly affects the dynamic and static response performance of the system. [0003] At present, in the radar servo system with thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/32
CPCG06F30/30G06F30/367
Inventor 李晋
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP