D-class amplifier - dab tsi nws muaj koob meej?

Suab chav kawm ntawv D-amplifier - ib tug ntaus ntawv rau me nyuam teeb liab mus thov kom lub tswv yim ntaus ntawv, siv lub ntsiab ntawm lub tswv yim Circuit Court nrog ib tug predetermined ntim thiab lub hwj chim theem nrog tus yam tsawg kawg nkaus hwj chim dissipation thiab distortion. Cov kev siv ntawm tej amplifiers tau pib nyob rau hauv 1958, tab sis nyob rau hauv tsis ntev los no xyoo lawv tej chaw muaj ntau zog markedly. Yuav ua li cas yog li ntawd zoo amplifier D-class? Nyob rau hauv no tsab xov xwm peb yuav ua tiag teb lo lus nug no.

Nyob rau hauv ib cov pa tso zis theem amplifying ntaus ua rau semiconductor ntsiab transistors. Lawv muab ib yam tso zis tam sim no tus nqi. Muaj ntau lub suab amplifier theem muaj ib tug Class A, B thiab AB. Thaum muab piv nrog cov qhov tso zis theem siv nyob rau hauv cov chav kawm ntawv D, lub hwj chim dissipation nyob rau hauv linear theem tseem ceeb txawm nyob rau hauv lub zoo tagnrho los ua ke. Qhov no zoo tshaj muab ib tug hauv chav kawm ntawv D tseem ceeb kom zoo dua nyob rau hauv feem ntau daim ntaub ntawv vim lub me me thaum tshav kub kub dissipation, me me qhov ntev, uas tsis muaj cov khoom nqi thiab ua rau kom lub sij hawm ntawm lub lag luam ntawm lub pab kiag li lawm.

Suab amplifiers Class D muaj lub hwj chim dissipation yog qis dua lub amplifiers A, B thiab AB kawm ntawv. Daws nyob rau hauv ib tug tso zis theem ntawm lub amplifier tso zis yog kev cob cog rua, tsis zoo thiab zoo hwj chim tsheb npav, yog li tsim ib tug series ntawm pulses nrog ib tug zoo thiab ib tug tsis zoo tej zaum. D-class amplifier vim rau cov duab ntawm xws li ib tug lub teeb liab tshuam thiaj lub hwj chim dissipation, vim hais tias muaj cov tam sim no los ntawm cov zis transistors, lub peev xwm sib txawv ntau heev tsis dhau (cov transistor yog nyob rau hauv ib tug kaw lub xeev). Yog hais tias cov transistor nyob rau hauv sab nraum zoov hom thiab tam sim no kis tau los ntawm nws, ib tug me ntsis voltage dauv txij ntawd lawm. Lub instantaneous hwj chim dissipated nyob rau hauv cov ntaub ntawv no yog tsawg heev.

Txawm hais tias lub hwj huam amplifier yog ib tug hauv chav kawm ntawv D dissipates ib tug me me npaum li cas ntawm thermal zog raws li muab piv nrog linear amplifiers, muaj yog tseem muaj ib tug txaus ntshai ntawm overheating Circuit Court. Qhov no tej zaum yuav tshwm sim thaum lub ntaus ntawv ua hauj lwm rau ib ntev lub sij hawm nyob rau hauv tag nrho cov hwj chim hom. Yuav kom tiv thaiv no, nws yog tsim nyog nyob rau hauv lub D-class amplifier pab kom kub tswj Circuit Court. Lub elementary tiv thaiv circuits nyob rau hauv lub tso zis theem yog switched tawm thaum lub kub ntsuas los ntawm lub kev sensor tshaj ib tug kub pib tsis txhob tig rau kom txog thaum lub kub dauv mus rau li qub. Ntawm cov hoob kawm, nws yog tej zaum yuav siv ntau circuits rau kub tswj. Piv txwv li, xab qhov kub thiab txias, cov kev tswj Circuit Court yuav maj mam txo lub ntim, thiab yog li txo lub tshav kub, uas ua rau kub yuav tau muab khaws tsis pub dhau lub yuav tsum tau txwv. Qhov kom zoo dua ntawm xws schemes yog tias tus ntaus ntawv yuav txuas ntxiv mus ua hauj lwm thiab yuav tsis raug kaw.

D-class amplifiers muaj ib tug drawback - thaum txoj siav tus ntaus ntawv yuav tshwm sim nyob rau hauv nws clicks thiab pops, uas tej zaum yuav chim siab rau cov neeg siv. Cov nyhuv no yuav tshwm sim tau yog hais tias tus "laus" los yog cov neeg pluag installation ntawm lub modulator, thiab ib tug synchronizing tso zis theem LC-lim mob thaum lub sij hawm switching rau hauv thiab tawm ntawm lub ntaus ntawv.