Lwm yam Excitation Switching Power Supply Circuit
1) Fais fab hloov Circuit Court
Cov khoom tseem ceeb ntawm lub zog hloov hluav taws xob yog lub hwj chim module VIPer12A, hloov transformer T, rectifier VD3, VD4, lim capacitors C4, C3.
300V voltage los ntawm R1 tam sim no limiting, thiab ces lim los ntawm C1, los ntawm lub T thawj winding P1 ntxiv rau lub IC1 (VIPer12A) fais fab mov davhlau ya nyob twg ⑤ ~ ⑧ ko taw, qhov voltage tsis tsuas yog ntxiv rau lub switching raj D ncej nws fais fab mov, tab sis kuj los ntawm high-voltage tam sim no qhov chaw ntawm ④ ko taw ntawm sab nraud lim capacitor C2 them. Thaum lub voltage tsim ntawm ob sab ntawm C2 mus txog 14.5V, IC1 nyob rau hauv lub 60kHz mem tes dav modulator thiab lwm yam circuits pib ua hauj lwm, lub excitation mem tes generated los ntawm lub Circuit Court ua rau lub switching raj ua hauj lwm nyob rau hauv lub switching xeev. Tom qab hloov lub raj, lub 300V voltage ntawm ob kawg ntawm C1 ua ib lub voj voog los ntawm P1 winding thiab lub raj hloov mus rau hauv av, kom lub P1 generates ib tug upward zoo thiab downward tsis zoo electromotive quab yuam, thiab lub P2 thiab P3 windings. yog induced kom muaj ib tug downward zoo thiab upward tsis zoo electromotive quab yuam, thiab lub zog yog khaws cia nyob rau hauv lub sab hauv ntawm lub T vim hais tias ntawm lub reverse bias cutoff ntawm VD1 thiab VD2. Tom qab lub raj hloov pauv raug txiav tawm, lub peev xwm hluav taws xob ntawm txhua qhov winding ntawm T yog inverted, yog li cov mem tes voltage tso tawm los ntawm P2 winding yog rectified los ntawm VD1 thiab lim los ntawm C3 los tsim txog 18V, thiab ib txoj kev los ntawm VD2 los hloov qhov pib- up circuit muab lub zog rau kev tswj ib feem ntawm IC1, thiab lwm txoj hauv kev muab lub zog rau lub hwj chim raj tsav tsheb, kiv cua lub cev muaj zog, oscillator thiab lwm yam circuits. cov pulse voltage tso zis los ntawm P3 winding yog rectified los ntawm VD3 thiab lim los ntawm C4 los tsim txog 8V, thiab tom qab ntawd dhau los ntawm VD3 thiab C4 los tsim txog 8V, thiab tom qab ntawd dhau los ntawm VD3 thiab C4 los tsim txog 8V. P3 winding tso zis pulse voltage los ntawm VD3 rectifier, C4 lim los tsim 8V los yog li ntawd, thiab tom qab ntawd los ntawm R4 tam sim no limiting, C5 filtering, rau 5V regulator IC2 fais fab mov, uas tswj cov zis 5V voltage. 5V voltage lim los ntawm C6 microprocessor, kev ua haujlwm ntawm cov zaub, qhov taw qhia thiab lwm yam khoom siv hluav taws xob.
2) Voltage regulator tswj Circuit Court
Cov khoom tseem ceeb ntawm qhov hluav taws xob tswj hluav taws xob tswj Circuit Court yog lub zog module VIPer12A, voltage regulator VZ, hloov transformer T, rectifier VD1, lim capacitor C3.
Thaum qhov hluav taws xob hluav taws xob nce los yog lub nra hnyav tshwm sim los ntawm kev hloov hluav taws xob tso zis hluav taws xob nce, qhov hluav taws xob nce siab ntawm ob qho kawg ntawm C3 kom VZ tawg conduction degree muaj zog, qhov yuam kev voltage muab los ntawm R2 rau IC1 ③ ko taw nce, thiab yog ua tiav los ntawm cov khoom siv hluav taws xob sab hauv ntawm IC1 kom lub sijhawm hloov cov raj xa hluav taws xob luv luv, lub zog khaws cia hauv T txo qis, thiab cov zis hluav taws xob ntawm lub zog hloov hluav taws xob txo qis rau tus nqi qub. Conversely, tus txheej txheem tswj voltage regulator yog thim rov qab. Yog li ntawd, kev tswj ntawm lub Circuit Court tuaj yeem ua kom ntseeg tau tias qhov tso zis hluav taws xob ntawm lub zog hloov hluav taws xob tsis cuam tshuam los ntawm kev siv hluav taws xob thiab kev thauj khoom, thiab paub txog kev tswj hwm kev tswj hwm.
3) Kev tiv thaiv undervoltage
Thaum VD2 lossis C2 tawg kom qhov hluav taws xob siab tshaj 14.5V tsis tuaj yeem tsim los ntawm ob qho kawg ntawm C2 thaum lub sijhawm hloov pauv, lub Circuit Court hauv IC1 tsis tuaj yeem pib; Yog tias VD1, VD2 qhib lossis T abnormally muab qhov hluav taws xob qis dua 8V rau ob qho kawg ntawm C2, qhov hluav taws xob tiv thaiv hluav taws xob hauv IC1 yog ua haujlwm, uas tsis txhob hloov cov raj raug puas vim qhov tsis txaus siab. Tsis tas li ntawd, dhau-voltage, dhau-tam sim no thiab dhau-kub tiv thaiv circuits kuj muaj nyob rau hauv IC1.
