A D-class audio amplifier yog ib qho cuab yeej tsim los tsim cov teeb liab siv rau cov tswv yim ntawm lub cuab yeej siv cov khoom siv hluav taws xob, nrog lub ntim thiab lub zog, nrog rau qhov tsawg kawg nkaus ntawm lub zog dissipation thiab distortion. Kev siv cov amplifiers tau pib hauv xyoo 1958, tab sis tsis ntev los no lawv cov koob meej tau nce ntxiv. Vim li cas D-class amplifier thiaj li zoo? Hauv tsab xov xwm no, peb yuav sim teb lo lus nug no.
Hauv cov khoom siv ua kom nrov nrov, cov theem tso zis yog tsim los ntawm cov khoom siv semiconductor-transistors. Lawv muab tus nqi tsim nyog ntawm cov zis tam sim no. Ntau lub tshuab suab muaj chav kawm A, B, thiab AB amplifier theem. Piv nrog rau theem tso zis tau siv nyob rau hauv chav kawm D, lub zog dissipation nyob rau hauv cov theem linear yog qhov tseem ceeb txawm tias thaum sib dhos zoo kawg nkaus. Qhov xwm txheej no muab chav kawm D nrog rau qhov zoo dua hauvCov ntawv thov feem ntau, vim yog qhov tsim hluav taws xob tsawg, qhov loj me me, cov khoom siv qis, thiab lub neej ntev ntawm lub cuab yeej.
Class D audio amplifiers muaj lub zog qis dua li chav kawm A, B thiab AB amplifiers. Cov yuam sij nyob rau hauv cov zis theem ntawm xws li ib tug amplifier txuas cov zis, tsis zoo thiab zoo zog rails, yog li tsim ib tug series ntawm pulses nrog ib tug zoo thiab tsis zoo lub peev xwm. Vim lub teeb liab zoo li no, D-class amplifier txo qis lub zog dissipated, vim hais tias nyob rau hauv lub xub ntiag ntawm ib tug muaj peev xwm sib txawv, tam sim no xyaum tsis dhau los ntawm cov zis transistors (lub transistor nyob rau hauv lub kaw lub xeev). Yog hais tias lub transistor nyob rau hauv qhib hom thiab tam sim no ntws los ntawm nws, ib tug negligible voltage tee hla nws. Lub zog tam sim no dissipation nyob rau hauv cov ntaub ntawv no tsawg heev.
Txawm hais tias qhov tseeb tias chav kawm D lub zog amplifier dissipates ib qho me me ntawm thermal zog piv rau linear amplifiers, tseem muaj qhov txaus ntshai ntawm overheating Circuit Court. Qhov no tuaj yeem tshwm sim thaum lub cuab yeej khiav ntawm lub zog tag nrho ntev. Txhawm rau tiv thaiv cov txheej txheem no, nws yog ib qho tsim nyog yuav tsum suav nrog ntsuas kub tswj Circuit Court hauv D-class amplifier. Hauv cov hluav taws xob tiv thaiv theem pib, cov theem tso tawm tau raug muab tua thaum nws qhov kub thiab txias, ntsuas los ntawm lub ntsuas hluav taws xob, tshaj qhov ntsuas kub thiab yuav tsis tig mus txog thaum qhov kub thiab txias poob mus rau qhov qub. Tau kawg, nws muaj peev xwm siv ntau cov tswv yim rau kev tswj qhov kub thiab txias. Piv txwv li,los ntawm kev ntsuas qhov kub thiab txias, cov tswj Circuit Court tuaj yeem maj mam txo qhov ntim, yog li txo cov cua sov dissipation, vim li ntawd, qhov kub thiab txias yuav khaws cia nyob rau hauv qhov yuav tsum tau txwv. Qhov zoo ntawm cov tswv yim zoo li no yog tias lub cuab yeej yuav ua haujlwm txuas ntxiv thiab yuav tsis tua.
D-chav amplifiers muaj qhov tsis zoo - thaum lub cuab yeej qhib thiab kaw, nyem thiab pops tshwm sim hauv nws, uas tuaj yeem cuam tshuam cov neeg siv. Cov nyhuv no tuaj yeem tshwm sim nyob rau hauv rooj plaub ntawm "kev laus" lossis kev teeb tsa ntawm lub tshuab ua haujlwm tsis zoo, nrog rau kev sib koom ua ke ntawm cov zis theem nrog lub xeev ntawm LC lim thaum tig lub cuab yeej rau thiab tawm.
