Chii chinonzi EMI Electromagnetic Interference

Chii chinonzi EMI Electromagnetic Interference
Background
Electromagnetic interference (EMI) inotsanangurwa zvakanyanya sekukanganisa kwemagetsi kana magineti kunosvibisa kana kukanganisa kutendeseka kwechiratidzo kana zvikamu uye mabasa emidziyo yemagetsi.Electromagnetic interference, kusanganisira redhiyo frequency interference, inowanzowira muzvikamu zviviri zvakafara.Narrowband emissions kazhinji inogadzirwa nevanhu uye inoganhurwa kunzvimbo diki yeredhiyo.Hum kubva kumatambo emagetsi muenzaniso wakanaka wekubuda kwenarrowband.Dzinoenderera mberi kana kuti pano neapo.Broadband radiation inogona kugadzirwa nevanhu kana yakasikwa.Vanowanzo kukanganisa nzvimbo dzakafara dze electromagnetic spectrum.Zviitiko zvake zvepamwe chete zvinongoitika zvega, zvisingaite, kana zvinoenderera.Zvese kubva pakurohwa nemheni kusvika kumakomputa zvinoburitsa mwaranzi webroadband.
EMI source
Iko kukanganiswa kwemagetsi kunoitwa neEMI mafirita kunogona kuuya nenzira dzakawanda dzakasiyana.Mukati memidziyo yemagetsi, kupindira kunogona kuitika nekuda kweiyo impedance, reverse currents mutambo dzinobatanidza.Inogonawo kukonzerwa nekuchinja kwevoltage mumakondakita.EMI inogadzirwa kunze nesimba remuchadenga senge solar flare, magetsi kana tambo dzenhare, midziyo, uye tambo dzemagetsi.Yakawanda yeEMI inogadzirwa pamwe netambo dzemagetsi uye inotumirwa kumidziyo.EMI mafirita midziyo kana mamodule emukati akagadzirirwa kuderedza kana kubvisa aya marudzi ekukanganisa.
EMI sefa
Pasina kunyura mune yakaomesesa sainzi, yakawanda electromagnetic kupindira iri mune yakakwirira frequency renji.Izvi zvinoreva kuti pakuyera chiratidzo senge sine wave, nguva dzinenge dzave pedyo.EMI mafirita ane zvikamu zviviri, capacitor uye inductor, anoshanda pamwechete kudzvanyirira aya masaini.Macapacitors anodzvanya mafungu akananga uye anopfuura anochinjika mafungu umo kuwanda kwemagetsi kukanganiswa kwemagetsi kunounzwa muchishandiso.Inductor inenge idiki magineti emagetsi anochengeta simba mundima yemagineti kana ikozvino inopfuura nemairi, ichideredza voltage yese.Macapacitors anoshandiswa muEMI mafirita, anonzi shunt capacitors, chengetedza yakakwira frequency currents mukati meimwe siyana kure nedunhu kana chikamu.A shunt capacitor inodyisa yakakwira frequency ikozvino / kupindira kune inductor yakaiswa munhevedzano.Sezvo ikozvino inopfuura nemuinductor yega yega, simba rose kana voltage inodonha.Nenzira yakanaka, inductors inoderedza kupindira kune zero.Izvi zvinodaidzwa zvakare kuti pfupi kusvika pasi.EMI mafirita anoshandiswa mumhando dzakasiyana siyana dzekushandisa.Zvinowanikwa mumidziyo yemurabhoritari, midziyo yeredhiyo, makomputa, midziyo yekurapa, uye zvechiuto.
Dzidza nezve yedu EMI/EMC kusefa mhinduro

Macapacitors anodzvanya mafungu akananga uye anopfuura anochinjika mafungu umo kuwanda kwemagetsi kukanganiswa kwemagetsi kunounzwa muchishandiso.An inductor chinhu chidiki chemagetsi chemagetsi chinochengeta simba mundima yemagineti kana ikozvino yapfuura nemairi, zvichikonzera kudonha kwemagetsi.Macapacitors anoshandiswa muEMI mafirita, anonzi shunt capacitors, chengetedza yakakwira frequency currents mukati meimwe siyana kure nedunhu kana chikamu.A shunt capacitor inodyisa yakakwira frequency ikozvino / kupindira kune inductor yakaiswa munhevedzano.Sezvo ikozvino inopfuura nemuinductor yega yega, simba rose kana voltage inodonha.Nenzira yakanaka, inductors inoderedza kupindira kune zero.Izvi zvinodaidzwa zvakare kuti pfupi kusvika pasi.EMI mafirita anoshandiswa mumhando dzakasiyana siyana dzekushandisa.
Dzidza zvakawanda nezveDOREXSEMI mafirita pano.