1. Ha re lokisa phepelo ea motlakase skrineng sa pontšo ea LED, re lokela ho qala ka ho sebelisa multimeter ho bona hore na ho na le potoloho e khuts'oane ea sesebediswa se seng le se seng sa motlakase, joalo ka borokho bo lokisang matla, switch tube, high-frequency high-power rectifier tube. , le hore na mohanyetsi oa matla a phahameng a hatellang matla a ho phahama a chesoa.Joale, re hloka ho bona hore na khanyetso ea boema-kepe bo bong le bo bong ba tlhahiso e fosahetse.Haeba lisebelisoa tse ka holimo li senyehile, re lokela ho li nkela sebaka ka tse ncha.

2. Ka mor'a ho qeta liteko tse ka holimo, haeba phepelo ea motlakase e buletsoe 'me e ntse e sa khone ho sebetsa hantle, re lokela ho leka module ea motlakase (PFC) le karolo ea pulse width modulation (PWM), hlahloba lintlha tse nepahetseng, le ho itloaetsa. mesebetsi ea pinana ka 'ngoe ea li-module tsa PFC le PWM le maemo a hlokahalang bakeng sa ts'ebetso ea bona e tloaelehileng.

3. Bakeng sa phepelo ea motlakase e nang le potoloho ea PFC, hoa hlokahala ho lekanya hore na motlakase lipheletsong tse peli tsa capacitor ea filthara ke hoo e ka bang 380VDC.Haeba ho na le voltage e ka bang 380VDC, e bontša hore module ea PFC e sebetsa ka mokhoa o tloaelehileng.Joale, hoa hlokahala ho bona boemo bo sebetsang ba mojule oa PWM, ho lekanya terminal ea motlakase ea VC, terminal voltage output VR, ho qala le ho laola Vstart/Vcontrol terminal voltage, le ho sebelisa 220VAC/220VAC isolation transformer ho fana ka matla ho led skrineng sa pontšo, Sebelisa oscilloscope ho bona hore na waveform ea PWM module CT e fella fatše ke Sawtooth wave wave kapa triangle wave e nang le linearity e ntle.Mohlala, pheletso ea TL494 CT ke leqhubu la Sawtooth, 'me pheletso ea FA5310 CT ke leqhubu la kgutlotharo.Na waveform ea tlhahiso V0 ke lets'oao le moqotetsane la pulse.

4. Ts'ebetsong ea tlhokomelo ea phepelo ea matla a skrine ea pontšo ea LED, lisebelisoa tse ngata tsa lisebelisoa tsa lisebelisoa tsa motlakase li sebelisa UC38×& Times;Boholo ba likarolo tsa 8-pin PWM letotong ha li sebetse ka lebaka la tšenyo ea ho qala ho hanyetsa matla kapa ho fokotseha ha ts'ebetso ea chip.Ha ho se na VC ka mor'a hore potoloho ea R e robehe, karolo ea PWM e ke ke ea sebetsa 'me e hloka ho nkeloa sebaka ke sehanyetsi se nang le matla a ho hanyetsa matla a tšoanang le a pele.Ha nako ea ho qala ea karolo ea PWM e eketseha, boleng ba R bo ka fokotsoa ho fihlela karolo ea PWM e ka sebetsa ka mokhoa o tloaelehileng.Ha ho lokisoa phepelo ea motlakase ea GE DR, mojule oa PWM e ne e le UC3843, 'me ha ho na lintho tse ling tse sa tloaelehang tse ileng tsa fumanoa.Ka mor'a ho hokahanya mochine oa 220K ho R (220K), karolo ea PWM e ile ea sebetsa 'me motlakase oa tlhahiso o ne o tloaelehile.Ka linako tse ling, ka lebaka la liphoso tsa potoloho ea peripheral, motlakase oa 5V qetellong ea VR ke 0V, 'me karolo ea PWM ha e sebetse.Ha ho lokisoa matla a khamera ea Kodak 8900, boemo bona bo kopana.Potoloho e kantle e hokahaneng le pheletso ea VR e khaotsoe, 'me VR e fetoha ho tloha ho 0V ho ea ho 5V.Karolo ea PWM e sebetsa ka mokhoa o tloaelehileng mme motlakase oa tlhahiso o tloaelehile.

5. Ha ho se na motlakase o pota-potileng 380VDC ho capacitor ea ho hloekisa, e bontša hore potoloho ea PFC ha e sebetse hantle.Lithakhisa tsa bohlokoa tsa mojule oa PFC ke pinana ea ho kenya matla VC, pini ea ho qala Vstart/control, CT le RT pin, le V0 pin.Ha u lokisa khamera ea Fuji 3000, leka hore ha ho na motlakase oa 380VDC ho capacitor ea filthara ka boto e le 'ngoe.VC, Vstart/control, CT le RT waveforms hammoho le V0 waveforms li tloaelehile.Ha ho na V0 waveform sebakeng sa G pole ea sebaka sa ho lekanya matla a switch switch.Kaha FA5331 (PFC) ke karolo ea patch, kamora nako e telele ea ts'ebeliso ea mochini, ho na le solder e fosahetseng lipakeng tsa V0 le boto, mme lets'oao la V0 ha le romelloe ho G pole ea Field-effect transistor. .Weld the V0 end to the soldier joint on board, 'me u sebelise multimeter ho lekanya 380VDC voltage ea filthara capacitor.Ha Vstart / control terminal e le maemong a tlase a matla mme PFC e sa khone ho sebetsa, hoa hlokahala ho bona lipotoloho tse amanang le periphery qetellong ea eona.