Dab tsi yog thermocouple signal processing li PWM yoj

1. Thermocouple teeb liab ua raws li PWM yoj
Thermocouples feem ntau yog siv cov ntsuas kub ntsuas uas tsim cov cim hluav taws xob me me los ntawm kev ntsuas qhov kub ntawm qhov sib txawv ntawm cov hlau sib txawv. Hauv ntau daim ntawv thov, peb yuav tsum ua cov txheej txheem thermocouple teeb liab rau hauv pulse width modulation (PWM) nthwv dej kom ua tiav qhov ntsuas kub hauv kev tswj hwm.
Yog li, yuav ua li cas thiaj ua tau cov teeb liab thermocouple rau hauv PWM nthwv dej?
2. Cov kauj ruam rau kev ua cov cim thermocouple rau hauv PWM nthwv dej
Teeb liab txias
Ua ntej, peb yuav tsum tau kho cov teeb liab thermocouple kom hloov mus rau cov tiam tom ntej ntawm PWM nthwv dej. Thermocouple signals feem ntau me me thiab muaj qee qhov amplitude, offset, thiab suab nrov. Yog li ntawd, peb yuav tsum ua cov txheej txheem xws li amplification, filtering, thiab denoising. Amplification tuaj yeem ua tiav los ntawm amplifiers, filtering tuaj yeem ua tiav los ntawm cov lim dej qis, thiab kev denoising tuaj yeem ua tiav los ntawm cov teeb liab ua cov algorithms.
Analog-rau-digital conversion
Thermocouple teeb liab yog lub teeb liab analog, thaum PWM nthwv dej yog lub teeb liab digital. Yog li ntawd, peb yuav tsum tau hloov cov teeb liab analog rau hauv daim ntawv digital los ntawm kev hloov pauv analog-rau-digital. Feem ntau siv analog-rau-digital converters muaj xws li successive approximation (SAR) converters, integral (Sigma Delta) converters, thiab lwm yam. Tsim nyog converters yuav xaiv tau raws li tej kev xav tau.
PWM wave generation
Tom qab lub teeb liab thermocouple dhau los ntawm kev hloov pauv hloov pauv mus rau digital, peb tuaj yeem pib tsim PWM nthwv dej. PWM nthwv dej yog lub teeb liab uas oscillates ntawm lub sijhawm ruaj khov, thiab nws lub voj voog ua haujlwm tuaj yeem hloov kho raws li cov txiaj ntsig ntawm kev hloov pauv-rau-digital. Cov txheej txheem PWM yoj tsim muaj xws li cov txheej txheem txee, txoj kev sib piv, thiab txoj hauv kev sib xyaw ua ke. Xaiv ib txoj hauv kev tsim nyog los tsim PWM nthwv dej raws li cov ntawv thov tshwj xeeb thiab cov cai.
PWM wave output
Tom qab ntawd, peb yuav tso tawm qhov tsim PWM nthwv dej rau qhov kev tswj hwm kom ua tiav qhov ntsuas kub. Lub luag hauj lwm voj voog ntawm PWM tsis yog ncaj qha proportional rau qhov loj ntawm lub thermocouple teeb liab, xav txog qhov ntsuas kub tam sim no. Lub kaw lus tswj tau tuaj yeem kho cov xwm txheej ua haujlwm ntawm cov tswj xws li cua sov thiab cua txias raws li lub luag haujlwm ntawm PWM nthwv dej, yog li ua tiav qhov ntsuas kub.
Kev ua cov thev naus laus zis thev naus laus zis rau hauv PWM tsis tuaj yeem ua tiav qhov ntsuas kub. Cov kauj ruam tseem ceeb hauv kev ua cov cim thermocouple thiab tsim PWM nthwv dej suav nrog cov teeb liab txias, analog-to-digital conversion, PWM nthwv dej tiam, thiab PWM yoj tawm. Los ntawm cov kauj ruam no, peb tuaj yeem hloov pauv cov teeb liab thermocouple rau hauv digital PWM nthwv dej, yog li ua tiav qhov ntsuas kub hauv kev tswj hwm.