Optocoupler Cov yam ntxwv ua haujlwm

1. Siab hom kev tsis lees paub piv

Nyob rau hauv lub optocoupler, txij li thaum lub coupling capacitance ntawm lub teeb-emitting raj thiab lub teeb receiver yog heev me me (nyob rau hauv 2pF), lub hom-hom input voltage muaj me ntsis cuam tshuam rau cov zis tam sim no los ntawm inter-electrode coupling capacitance, yog li qhov ntau. -mode rejection ratio yog siab heev.

2. Cov yam ntxwv tso zis

The output characteristic of the photocoupler refers to the relationship between the bias voltage VCE applied to the phototransistor and the output current IC under a certain luminous current IF. When IF=0, the light-emitting diode does not emit light. The electrode output current is called dark current, which is generally very small. When IF>0, nyob rau hauv ib qho IF, qhov sib txuas IC yog qhov tseem ceeb tsis cuam tshuam rau VCE. Kev hloov pauv ntawm IC thiab IF muaj kev sib raug zoo, thiab cov yam ntxwv ntawm cov khoom siv photocoupler ntsuas los ntawm cov khoom siv hluav taws xob semiconductor cov duab kos duab zoo ib yam li cov yam ntxwv ntawm cov khoom siv hluav taws xob zoo tib yam.

3. Lub photocoupler tuaj yeem siv los ua cov kab sib txuas

Muab qhov tsis ncaj ncees tam sim no ntawm lub teeb-emitting diode, thiab tom qab ntawd ob peb lub teeb liab voltage rau lub teeb-emitting diode los ntawm ib tug resistor, thiaj li hais tias tus phototransistor tau txais ib tug optical teeb liab uas nce los yog txo nyob rau hauv bias tam sim no, thiab nws cov zis tam sim no yuav ua raws. lub teeb liab input. Qhov voltage hloov linearly. Lub photocoupler tseem tuaj yeem ua haujlwm hauv lub xeev hloov thiab xa cov teeb liab mem tes. Thaum xa cov paib pulse, muaj qee lub sijhawm ncua sijhawm ntawm cov teeb liab tawm tswv yim thiab cov teeb liab tso tawm, thiab lub sijhawm tawm tswv yim thiab cov zis ncua sij hawm ntawm optocouplers nrog cov qauv sib txawv sib txawv heev.