描述
A類放大器
純甲類放大器即末級(jí)放大管工作在甲類狀態(tài)的放大器，也叫純A類放大器。A類放大器在輸入信號(hào)的整個(gè)周期內(nèi)均有電流流過晶體管（即導(dǎo)通角為3600），這種放大器被稱為A類放大器。A類放大器的失真很小，但其效率也低，即使在理想情況下，最高效率也只能達(dá)到50%，通常只有30%~40%0在輸入信號(hào)的半個(gè)周期內(nèi)有電流流過晶體管（即導(dǎo)通角為1800），這種放大器被稱為B類放大器。由于導(dǎo)通角為1800，輸入信號(hào)的另半個(gè)周期波形被削掉，因此失真很大。
甲類功放（A類功放）輸出級(jí)中兩個(gè)（或兩組）晶體管永遠(yuǎn)處于導(dǎo)電狀態(tài)，也就是說不管有無信號(hào)輸入它們都保持傳導(dǎo)電流，并使這兩個(gè)電流等于交流電的峰值，這時(shí)交流在最大訊號(hào)情況下流入負(fù)載。當(dāng)無訊號(hào)時(shí)，兩個(gè)晶體管各流通等量的電流，因此在輸出中心點(diǎn)上沒有不平衡的電流或電壓，故無電流輸入揚(yáng)聲器。當(dāng)訊號(hào)趨向正極，線路上方的輸出晶體管容許流入較多的電流，下方的輸出晶體管則相對(duì)減少電流，由于電流開始不平衡，于是流入揚(yáng)聲器而且推動(dòng)揚(yáng)聲器發(fā)聲。簡(jiǎn)單來說，純甲類放大器永遠(yuǎn)工作在最大輸出功率狀態(tài)。
B類放大器
由于晶體管起始導(dǎo)通電壓值的存在及起始導(dǎo)通的非線性，B類放大器存在著交越失真，這在高質(zhì)量的HI-FI放大領(lǐng)域顯然是不允許的。所以，常將推挽式電路的兩個(gè)晶體管均施加少量偏置，使其導(dǎo)通角略大于1800，可避免產(chǎn)生交越失真。這種電路，導(dǎo)通角介于A類和B類之間，稱為AB類（甲乙類）放大器oAB類電路的效率要低于B類，只有60%~70%。但因其兼顧了A類與B類的優(yōu)點(diǎn)（低失真、高效率），故目前得到了廣泛的應(yīng)用。
產(chǎn)品承
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主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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