FPGA (field programmable gate array) based system and method for measuring speed of fan

A fan and speed measurement technology, applied in pump testing, liquid variable capacity machinery, machines/engines, etc., can solve problems such as many equipment and poor speed measurement accuracy
CN102392816AActive Publication Date: 2012-03-28DAWNING INFORMATION IND BEIJING +1
3 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
DAWNING INFORMATION IND BEIJING
Publication Date
2012-03-28

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention provides an FPGA (field programmable gate array) based method for measuring the speed of a fan. The FPGA is internally provided with the following functional modules: a synchronization module (1), a counting module (2), a sampling module (3), a calculating module (4), a system clock module (5) and a timer module (6), wherein 250MHz clock is supplied to all the modules by the system clock module (5). Compared with the prior art, the FPGA based method for measuring the speed of the fan has the beneficial effects: according to the technical scheme, basically no additional device is added to an FPGA board card with the fan and only a signal of the fan needs to be input through an OC (open collector) gate; according to the scheme, few resources are occupied in the FPGA, thereby achieving a very practical added value function of a board card system; and an accurate result of the rotating speed of the fan can be considered as a reference for judging if a working temperature of the board card is abnormal.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical direction of fan speed measurement in the field of system signal detection, and provides a system and method for using FPGA to measure fan speed. Background technique

[0002] On PC systems or board systems, fans have become an essential cooling device. Existing patents on fan speed detection generally focus on detecting the quality of fans during the trial production stage. This patent is only aimed at the speed detection of fans with good quality after normal power-on in the workplace, and is used for system monitoring. Most of the commonly used fans are PWM fans, where PWM stands for Pulse Width Modulation (Pulse Width Modulation), fan speed is usually measured according to the percentage of pulse width (duty cycle), and some other PWM fans also have some Ways, such as using a signal generator to generate a PWM wave with a certain frequency and duty cycle required, and then using a tachometer to compare and me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More