Txoj kev los txhim kho Standby Efficiency ntawm Switching Power Supply
Txiav tawm qhov pib
Rau flyback fais fab mov, cov nti tswj tau siv los ntawm kev pabcuam winding tom qab pib, thiab qhov hluav taws xob poob thoob plaws qhov pib resistor yog txog 300V. Piv txwv tias tus nqi pib tsis kam yog 47k Ω, lub zog siv ze li ntawm 2W. Txhawm rau txhim kho standby efficiency, cov channel kuj yuav tsum raug txiav tawm tom qab pib. TOPSWITCH, ICE2DS02G muaj ib qho kev pib ua haujlwm rau sab hauv uas tuaj yeem tua cov resistor tom qab pib. Yog hais tias tus maub los tsis muaj lub siab xav pib Circuit Court, lub capacitor kuj tseem tuaj yeem txuas rau hauv series nrog cov pib resistor, thiab qhov poob tom qab pib tuaj yeem maj mam txo mus rau xoom. Qhov tsis zoo yog tias cov khoom siv hluav taws xob tsis tuaj yeem rov pib dua, thiab lub voj voog tsuas tuaj yeem rov pib dua tom qab disconnecting lub input voltage thiab tawm lub capacitor.
Txo lub moos zaus
Lub moos zaus tuaj yeem txo qis lossis maj mam txo. Lub qhovntsej thiaj tsis mob yog hais txog qhov txo qis hauv lub moos zaus ua tiav los ntawm ib qho kev qhia tshwj xeeb thaum cov lus tawm tswv yim dhau ntawm qhov pib.
Hloov ua haujlwm hom
QR → pWM: Rau kev hloov cov khoom siv hluav taws xob ua haujlwm nyob rau hauv high-frequency hom, hloov mus rau low-frequency mode thaum standby tuaj yeem txo qhov kev poob qis. Piv txwv li, rau quasi resonant hloov cov khoom siv hluav taws xob (ua haujlwm ntawm ntau zaus ntawm ntau pua kHz mus rau ob peb MHz), lawv tuaj yeem hloov mus rau qhov qis-frequency pulse width modulation control mode pWM (tens of kHz) thaum standby. Lub IRIS40xx nti txhim kho kev ua haujlwm ntawm kev ua haujlwm los ntawm kev hloov ntawm QR thiab PWM. Thaum lub hwj chim mov nyob rau hauv lub teeb load thiab standby hom, lub auxiliary winding voltage yog tsawg, Q1 yog muab tua, thiab lub resonant teeb liab tsis tau kis mus rau lub FB davhlau ya nyob twg. Qhov hluav taws xob FB tsawg dua li qhov ntsuas hluav taws xob hauv lub nti, thiab quasi resonant hom tsis tuaj yeem tshwm sim. Lub Circuit Court ces ua haujlwm nyob rau hauv qis zaus mem tes dav modulation tswj hom. 2. pWM → pFM Rau kev hloov cov khoom siv hluav taws xob ua haujlwm hauv pWM hom ntawm lub zog ntsuas hluav taws xob, kev ua haujlwm standby kuj tuaj yeem txhim kho los ntawm kev hloov mus rau pFM hom, nrog lub sijhawm tig rau thiab kho lub sijhawm tig tawm. Qhov qis dua, lub sijhawm tig tawm ntev dua, thiab qis dua qhov ua haujlwm zaus. Siv lub teeb liab standby rau nws pW/pin. Raws li kev ntsuas load, tus pin no nyob rau theem siab, thiab lub voj voog ua haujlwm hauv pWM hom. Thaum lub load qis dua ib qho chaw pib, tus pin no tau rub mus rau theem qis, thiab lub voj voog ua haujlwm hauv pFM hom. Los ntawm kev hloov ntawm pWM thiab pFM, lub zog ua haujlwm tau zoo thaum lub teeb thauj khoom thiab lub xeev standby tau txhim kho. Los ntawm kev txo lub moos zaus thiab hloov cov kev ua haujlwm, qhov kev ua haujlwm standby zaus tuaj yeem txo qis, kev ua haujlwm standby tuaj yeem txhim kho, thiab tus maub los tuaj yeem ua haujlwm tsis tu ncua. Cov zis tuaj yeem hloov kho kom zoo thoob plaws hauv tag nrho cov khoom thauj. Txawm tias thaum lub load surges los ntawm xoom mus rau tag nrho cov load, nws muaj peev xwm sai sai teb, thiab vice versa. Qhov tso zis voltage poob thiab overshoot yog ob qho tib si khaws cia nyob rau hauv qhov kev tso cai.
