1. Kana tichigadzirisa magetsi emagetsi e LED, tinoda kutanga tashandisa multimeter kuti tione kana pane kuparara kwechikamu chiduku mumagetsi ega ega, zvakadai sebhiriji rekugadzirisa magetsi, shandura chubhu, high-frequency high-power rectifier tube. , uye kana iyo-yepamusoro-simba resistor inodzvanya surge ikozvino inopiswa kunze.Zvadaro, isu tinoda kuona kana kuramba kwega rega rega voltage port hakuna kunaka.Kana midziyo iri pamusoro yakakuvadzwa, tinofanira kuitsiva nemitsva.

2. Mushure mekupedza bvunzo dziri pamusoro, kana magetsi akabatidzwa uye asisakwanise kushanda nemazvo, tinoda kuyedza iyo power factor module (PFC) uye pulse wide modulation component (PWM), ongorora ruzivo rwakakodzera, uye tijairane nayo. mabasa epini yega yega yePFC nePWM module uye mamiriro anodiwa ekushanda kwavo kwakajairika.

3. Nekuda kwemagetsi emagetsi nePFC circuit, zvakakosha kuyera kana magetsi ari kumativi ose efirita capacitor anenge 380VDC.Kana paine voltage ingangoita 380VDC, inoratidza kuti iyo PFC module iri kushanda zvakajairika.Zvadaro, zvakakosha kuona mamiriro ekushanda kwePWM module, kuyera simba rayo rekuisa terminal VC, referensi voltage inobuda terminal VR, kutanga nekudzora Vstart/Vcontrol terminal voltage, uye shandisa 220VAC/220VAC yekuzviparadzanisa transformer kupa simba kune inotungamira. ratidza skrini, Shandisa oscilloscope kuona kana waveform yePWM module CT inopera kusvika pasi iSawtooth wave wave kana triangle wave ine mutsara wakanaka.Semuyenzaniso, TL494 CT end is Sawtooth wave wave, uye FA5310 CT magumo igonyo remafungu.Iyo waveform yekubuda V0 yakarairwa yakamanikana pulse chiratidzo.

4. Muchiito chekuchengetedza che LED kuratidza chidzitiro chemagetsi magetsi, akawanda ma LED emagetsi emagetsi emagetsi anoshandisa UC38 × & Times;Zvizhinji zve8-pini PWM zvikamu munhevedzano hazvishande nekuda kwekukuvadzwa kwekupokana kwekutanga kwesimba rekupa kana kuderera kwechip performance.Kana pasina VC mushure mekunge R dunhu raputswa, chikamu chePWM hachigone kushanda uye chinoda kutsiviwa neanopikisa ane simba rimwechete rekudzivirira kukosha seyekutanga.Kana iyo yekutanga ikozvino yePWM chikamu ichiwedzera, iyo R kukosha inogona kuderedzwa kusvika iyo PWM chikamu chave kushanda zvakajairika.Pakugadzirisa magetsi eGE DR, iyo PWM module yaive UC3843, uye hapana zvimwe zvisizvo zvakaonekwa.Mushure mekubatanidza 220K resistor kuR (220K), chikamu chePWM chakashanda uye simba rekubuda raive rakajairika.Dzimwe nguva, nekuda kwekukanganisa kwedunhu, iyo 5V voltage paVR yekupedzisira ndeye 0V, uye chikamu chePWM hachishande.Pakugadzirisa simba rekushandisa kwekhamera yeKodak 8900, mamiriro ezvinhu aya akasangana.Dunhu rekunze rakabatana kumagumo eVR rakabviswa, uye VR inoshanduka kubva pa0V kuenda ku5V.Chikamu chePWM chinoshanda zvakajairwa uye kubuda kwemagetsi kwakajairwa.

5. Kana pasina mhepo inopoteredza 380VDC pane yekusefa capacitor, inoratidza kuti PFC yedunhu haisi kushanda zvakanaka.Mapini ekuona akakosha ePCC module ndiyo pini yekupinza yemagetsi VC, pini yekutanga Vstart/control, CT uye RT pini, uye V0 pini.Paunenge uchigadzirisa kamera yeFuji 3000, edza kuti hapana 380VDC voltage pane sefa capacitor pane rimwe bhodhi.VC, Vstart/control, CT uye RT waveforms pamwe neV0 waveforms zvakajairika.Iko hakuna V0 waveform paG danda reyeyero yemunda mhedzisiro simba switch chubhu.Sezvo FA5331 (PFC) iri chigamba chinhu, mushure menguva refu yekushandiswa kwemuchina, pane kushaikwa kwekutengesa pakati peV0 yekupedzisira nebhodhi, uye V0 chiratidzo hachina kutumirwa kuG pole yeMunda-effect transistor. .Weld the V0 end kune solder joint pabhodhi, uye shandisa multimeter kuyera 380VDC voltage ye filtering capacitor.Kana iyo Vstart/control terminal iri padanho remagetsi rakaderera uye iyo PFC isingakwanise kushanda, zvinodikanwa kuti uone maseketi akakodzera akabatana kune periphery pamagumo ayo.