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Pulse frequency based on FPGA technology

In Electronic Infomation Category: P | on April 26,2011

Abstract: In order for motion control system for precise control of the pulse to reduce the accumulated error, the need for pulse points, frequency and LM2931MX-5.0 datasheet and synthetic processing. Describes the general implementation of various forms of crossover method are given in the Alteras FPGA CyclONe II Series EP2C8Q208C8 models implemented on the chip circuit diagram and LM2931MX-5.0 price and test results, verify the correctness and LM2931MX-5.0 suppliers and feasibility of the design. Because of the design parameters of the method used, it has extensive application value.

1 Overview

Motion control systems often need to synchronize the axis linkage, electronic gear technology can precisely control problems to solve and eliminate errors, it has broad application prospects. Electronic gear control technology: Simply put, the motion control system is the pulse frequency control signals such as zoom in or out any proportion, and to ensure accuracy, so that the system can carry a wider range of control, the future will be more convenient extension , the main carrier of various stepper and servo motor.

From the above analysis we can see in the motion control system to good use electronic gear technology, the inevitable use to pulse points, frequency and synthesis, ie, frequency synthesis, frequency synthesis is one or more high-precision and high stability of the reference frequency pulse to add, subtract, multiply and divide arithmetic to generate the same degree of accuracy and stability of one or more frequency signal technology. The technology has been in modern communication systems have extensive and important applications and research to its applications in motion control system is a good explore and try.

2 pulse frequency implementations

Points, frequency doubling technology has two types of implementations, the use of phase-locked loop methods and hardware plus software algorithm using the method. PLL method has wide range of applications, technology is the most mature technology can facilitate the realization of phase-locked loop clock hours, frequency, and its main advantages is to simplify the clock design can improve the efficiency of the device per unit area, and has programmable duty cycle function, the programmer can control the clock positive and negative edge position, so that data can be positive or negative edge of the clock transmission, increasing the systems accuracy. But can not provide phase-locked loop circuit or need to try less expensive resources for the occasion, the use of FPGA for electronic circuit design, simulation and hardware verification, hardware will need to use additional software algorithm approach to the points, frequency, and this A major discussion points, multiplier methods. We can also be understood as the frequency division ratio greater than 1, so easy to express, in this paper points, collectively referred to as frequency multiplier.

If the duty cycle and pulse interval requirements are not very high, pulse synthesis techniques can be used to produce the desired pulse. Such as a clock reference source for the fi = 1024hz, with 10-bit counter to generate pulses of different frequencies, some of which required extraction for overlay, can constitute a range of 0 to 1023pp s clock pulse output continuously adjustable fo . Theory formula is as follows:

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