Doimiy tok manbaiga kirish 220V tarmoq kuchlanishidir. Oddiy sharoitlarda kerakli shahar kuchlanishining qiymati tarmoq kuchlanishining samarali qiymatidan juda farq qiladi. Shuning uchun AC kuchlanishini qayta ishlashdan oldin quvvat transformatori orqali kuchlanishni kamaytirish kerak. Transformatorning ikkilamchi kuchlanishining rms qiymati keyingi kontaktlarning zanglashiga olib keladigan ehtiyojlariga bog'liq. Amalda transformatorlardan foydalanmaslik mumkin, ammo boshqa usullardan foydalanish mumkin.
Transformatorning ikkilamchi tomonidagi kuchlanish rektifikator zanjiri orqali doimiy kuchlanishga aylanadi, ya'ni sinus to'lqinli kuchlanish bir yo'nalishli pulsatsiyalanuvchi kuchlanishga aylanadi. Rektifikatsiya qilingan kuchlanish katta AC komponentini o'z ichiga olganligi sababli, u yuk pallasining normal ishlashiga ta'sir qiladi va uni to'g'ridan-to'g'ri ishlatish mumkin emas. Kuchlanishning dalgalanishini kamaytirish uchun chiqish kuchlanishini tekislash uchun uni filtrlash pallasida (kondensator) filtrlash kerak. Ideal holda, barcha AC komponentlarini filtrlash pallasining chiqish kuchlanishi faqat doimiy kuchlanish bo'lishi uchun filtrlash kerak. Biroq, filtr sxemasi passiv sxema bo'lganligi sababli, filtr effekti yukga ulangandan keyin ta'sir qiladi. Yuqori barqarorlikni talab qilmaydigan elektron sxemalar uchun to'g'rilangan va filtrlangan doimiy kuchlanish quvvat manbai sifatida ishlatilishi mumkin.
Although the AC voltage becomes a DC voltage with a small AC component after rectification and filtering, when the grid voltage fluctuates or the load changes, its average value will also change. The function of the voltage regulator circuit is to make the output DC voltage basically free from the influence of grid voltage fluctuations and load changes, so as to obtain sufficiently high stability 1
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