Yuav Ua Li Cas Xaiv Zaj Duab Xis Capacitors Rau Wireless Charging Applications: Core Parameters, Materials, and Selection Guide
Oct 31, 2025| 
I. Kev Ua Tau Zoo rau Cov Zaj Duab Xis Capacitor hauv Wireless Charging
Zaj duab xis capacitors ua cov khoom tseem ceeb hauv wireless charging modules rau kev lim dej, lub zog cia, thiab cov hluav taws xob resonant vim lawv qhov zoo xws li qis sib npaug series tsis kam (ESR), siab tus kheej - kho cov khoom, thiab txuas lub neej ntev (txog 100,000 teev). Raws li lub koom haum Electronic Components Industry Association (ECIA) 2022 technical specifications, wireless charging applications yuav tsum ua qhov tseem ceeb hauv qab no:
1. Core Electrical Parameters
Rated Voltage: Yuav tsum ua kom haum 20% margin tshaj qhov kev khiav hauj lwm voltage. Piv txwv li, 500V qauv yuav tsum raug xaiv rau qhov chaw ua haujlwm 400V txhawm rau tiv thaiv overvoltage tawg.
Capacitance kam rau ua: Muaj- cov khoom qib feem ntau yog li ntawm ± 5% txog ± 10%. Rau cov wireless charging modules, ± 5% siab- qauv raug pom zoo kom ua kom muaj kev ruaj ntseg zoo.
Dissipation Factor (tanδ): Cov khoom lag luam hwm yuav tsum nthuav tawm<0.1%@1kHz to minimize energy loss during high-frequency operation and enhance charging efficiency.
Kub Coefficient: Polyester zaj duab xis (PET) yog +200ppm / degree, polypropylene (PP) yog -250ppm / degree. Xaiv cov ntaub ntawv sib piv lub wireless charging ntaus ntawv qhov kub thiab txias (feem ntau -20℃rau +85℃).
2. Mechanical thiab Environmental Properties
Lub miniaturization ntawm wireless charging pab kiag li lawm yuav tsum tau capacitors nrog compact qhov ntev (inch kam rau ua Tsawg dua los yog sib npaug rau ± 0.5mm). Lawv kuj yuav tsum tau tiv thaiv kev ntxhov siab (khoov lub kaum sab xis <3 degree) thiab pom cov av noo rhiab heev (cia ib puag ncig cov av noo <65% RH) kom hloov mus rau qhov nyuaj siv cov xwm txheej ntawm cov khoom siv nqa tau.
II. Kev xaiv cov khoom siv Dielectric
Cov khoom siv dielectric ntawm zaj duab xis capacitors ncaj qha cuam tshuam rau lawv qhov siab - zaus ua haujlwm thiab kev ntseeg tau. Cov ntaub ntawv tseem ceeb tam sim no hauv qhov chaw them nyiaj wireless suav nrog:
| Hom khoom | Cov yam ntxwv thiab qhov zoo | Siv tau Scenarios | Cov Khoom Muag Khoom |
| Polypropylene (PP) | Tsawg siab - zaus poob, siab rwb thaiv tsev tsis kam | Fast charging devices (>15W), resonant circuits | CBB21 Series (piv txwv li, 154J100V rau lub xov tooj ntawm tes wireless charging) |
| Polyester (PET) | Zoo kub stability, kuj tsis tshua muaj nqi | Tsawg- cov khoom siv fais fab (<10W), minimal ambient temperature fluctuations | General - lub hom phiaj zaj duab xis capacitors rau cov neeg siv khoom siv hluav taws xob |
| Polyphenylene sulfide (PPS) | High-temperature resistance (>125 degree), muaj zog tshuaj stability | Hauv - tsheb wireless charging, industrial- qib khoom siv |
Cov qauv tshwj xeeb rau lub tsheb tshiab OBCs |
Cov ntaub ntawv Source: Shanghai Gongpin 2025 Zaj duab xis Capacitor Daim Ntawv Thov Dawb
Kev pom zoo kev lag luam: Wireless charging modules feem ntau ua haujlwm ntawm zaus ntawm 100kHz thiab 200kHz. Cov khoom siv polypropylene (PP) tau dhau los ua qhov kev xaiv tseem ceeb vim nws qhov siab - zaus poob qis dua 0.05%. Cov khoom siv nqa tau yooj yim xws li cov xov tooj smartphones tau nce siab rau kev siv tshuab PP zaj duab xis, siv aluminium-zinc composite coatings los txhim kho tus kheej- kho muaj peev xwm.
III. Plaub- Cov txheej txheem xaiv cov kauj ruam thiab cov piv txwv zoo
Raws li Shanghai Gongpin txoj kev lag luam dav dav, kev xaiv ntawm wireless charging film capacitors tuaj yeem ua raws li cov txheej txheem txheem no:
1. Txheeb xyuas cov yam ntxwv ua haujlwm ntawm Circuit Court
Voltage Waveform: Sib txawv ntawm DC (piv txwv li, standby circuits), AC (xws li, resonant circuits), lossis pulsed (xws li, ceev them hom) kev siv.
Ripple Current Calculation: Siv cov mis Irms=√(I₁² + I₂² + … + In²) los xam tag nrho cov ripple tam sim no, kom ntseeg tau tias lub capacitor qhov ntsuas ripple tam sim no tshaj tus nqi tiag tiag los ntawm yam tsawg 30%.
2. Match cov khoom siv dielectric
High-frequency scenarios (xws li, them ceev tshaj 15W): Ua ntej PP cov ntaub ntawv, xws li tus qauv CBB22-105J(250V) nrog tanδ <0.08% @ 100kHz.
High - qhov kub thiab txias (piv txwv li, automotive wireless charging): Xaiv cov ntaub ntawv PPS nrog rau qhov kub thiab txias mus txog 150 degree.
3. Loj thiab Mounting Verification
Rau TWS earbud wireless charging rooj, qhov chaw sab hauv feem ntau txwv txoj kab uas hla ntawm lub capacitor rau<8mm and height to <5mm. Select ultra-thin metallized film capacitors (e.g., 184J100V smartband-specific models with 2.5mm thickness).
4. Kev ntsuam xyuas kev ntseeg siab
Rwb thaiv tsev tsis kam: Yuav tsum tshaj 10GΩ (@500V DC) kom tsis txhob muaj kev pheej hmoo ntawm kev tawg.
Solder compatibility: Kev ceev soldering kub yuav tsum tau tswj hauv qab 350℃rau<3 seconds to prevent pin oxidation.
IV. Technology Trends thiab Market Dynamics
Kev lag luam kev tshawb fawb qhia tias wireless charging film capacitors yog hloov mus rau ntau zaus (ua haujlwm zaus> 1MHz), ultra-thin profiles (dielectric txheej thickness <2μm), thiab kev sib xyaw. Shanghai Gongpin npaj yuav tso nano-coated PP capacitors nyob rau hauv 2024, npaj kom txo ESR los ntawm 30% thiab ncua lifespan los ntawm 50%, ua tau raws li qhov xav tau ntawm tom ntej - tiam 65W wireless ceev- cov khoom siv.
Los ntawm kev xav txog kev lag luam, kev mob siab rau wireless charging zaj duab xis capacitors tam sim no tsim cov koob -raws li cov khoom lag luam matrix npog ntau qib zog:
Tsawg- cov khoom siv fais fab (3W–10W): CBB21 series (154J–474J/100V)
Nruab nrab-rau- siab- cov khoom siv fais fab (15W–65W): CBB22 series (105J–225J/250V)
Automotive-grade devices (>100W): PPS dielectric siab-voltage qauv (piv txwv li, 630V-2kV withstand voltage ratings)
Xaus
Xaiv zaj duab xis capacitors yuav tsum ntsuas hluav taws xob kev ua tau zoo, cov khoom siv, thiab daim ntawv thov scenarios. Los ntawm kev ua raws li plaub-txoj kev txheej txheem-"kev lees paub qhov ntsuas, cov khoom sib txuam, kev kuaj xyuas qhov ntev, thiab kev ntsuas kev ntseeg tau"- qhov ruaj khov thiab kev ua haujlwm ntawm cov khoom siv wireless charging tuaj yeem txhim kho tau zoo. Raws li kev lag luam tau nce mus rau ntau zaus thiab kev ua haujlwm me me, polypropylene zaj duab xis capacitors nrog qhov poob qis thiab siab -kub tsis kam yuav tshwm sim raws li cov thev naus laus zis thev naus laus zis, muab kev txhawb nqa tseem ceeb rau kev siv dav dav ntawm wireless charging.