Kev tu cov txheej txheem rau zaus converter switching fais fab mov
1. Xyuas seb lub rectifier Circuit Court D1-D4 puas lawm los yog lub capacitor ntawm lub qhib Circuit Court lim Circuit Court puas lawm, seb qhov sib npaug resistors R1 thiab R2 zoo li qub, thiab seb cov kauj ruam-down resistor R3 puas los yog lub tus nqi kuj nce thiab ua tsis tau (kuaj nyob rau hauv lub hwj chim tawm).
2. Tshawb xyuas lub be thiab ce junctions ntawm lub hloov raj rau kev puas tsuaj thiab luv luv Circuit Court, thiab ntsuas seb txhua qhov winding ntawm lub hloov pauv hloov tau luv luv los txiav txim siab qhov zoo ntawm lub raj hloov pauv thiab hloov pauv hloov pauv (kuaj hauv qab hluav taws xob tawm).
3. Tshawb xyuas cov kev hloov kho thiab kev lim dej ntawm cov khoom tso tawm thib ob winding, thiab tsom mus rau kev kuaj xyuas seb lub lim dej capacitor puas bulging los yog puas tsuaj kom tshem tawm qhov muaj peev xwm ntawm qhov luv luv hauv Circuit Court thib ob.
4. Xyuas seb qhov nqus hluav taws xob D5, R11, thiab C9 puas zoo li qub (kuaj nyob rau hauv hluav taws xob hluav taws xob).
5. Tom qab paub tseeb tias cov khoom siv saum toj no yog qhov qub, peb tuaj yeem tshem tawm lub hwj chim hloov hluav taws xob los ntawm lub tshuab hloov zaus thiab ua qhov ntsuas hluav taws xob sib cais ntawm nws. Maj mam kho qhov voltage regulator rau qhov ntsuas hluav taws xob ntawm lub zog hloov hluav taws xob. Lub sijhawm no, koj yuav tsum tuaj yeem hnov lub suab squeaking thaum lub transformer pib vibrating. Yog tias koj tsis hnov lub suab vibration, siv multimeter los xyuas seb puas muaj DC voltage ntawm ib ncig ntawm 12V-16V ntawm qhov zoo thiab qhov tsis zoo ntawm UC3844 fais fab mov.
6. Tom qab paub tseeb tias qhov hluav taws xob ntawm qhov hluav taws xob kawg ntawm UC3844 yog qhov qub, ib qho oscilloscope tuaj yeem siv los xyuas seb puas muaj PWM nthwv dej tso tawm los ntawm tus pin 6 ntawm UC3844 mus rau qhov kawg ntawm qhov hloov raj (nyob ntawm tus qauv tsim Circuit Court. , qhov zaus ntawm PWM yoj yog feem ntau ntawm 20KHZ thiab 100KHZ).
7. Yog tias tsis muaj PWM nthwv dej tawm, hloov cov khoom siv sijhawm C5, R8, C6, lossis UC3844. Tom qab kev daws teeb meem cov kauj ruam saum toj no, lub zog hloov hluav taws xob yuav tsum muaj peev xwm ua haujlwm tau zoo. Hauv kev hloov pauv zaus, muaj ntau hom kev hloov hluav taws xob, tab sis cov ntsiab lus tseem ceeb yog tib yam. Piv txwv li, txhua lub PWM tswj nti muaj lub hwj huam mov davhlau ya nyob twg, lub sij hawm tivthaiv RC network, thiab qhov chaw nres nkoj rau tso tawm PWM nthwv dej. Tsuav peb nkag siab txog lawv cov qauv kev ua haujlwm thiab ua raws li qee txoj hauv kev thiab cov kauj ruam, peb tuaj yeem tshem tawm qhov tsis raug.
