Mune switch yemagetsi uye mamwe magetsi emagetsi system dhizaini chirongwa, vagadziri vezvirongwa vanozotarisa zvakanyanya kune akati wandei ma paramita eMOSFET, senge pa-off resistor, yakakura yekushandisa voltage, hombe kuyerera kwemagetsi. Kunyangwe chinhu ichi chirikutsoropodza, tichifunga nezvenzvimbo isina kufanira ichaita kuti dunhu rekupa magetsi risashande zvakanaka, asi kutaura zvazviri, izvi zvinongopedzwa danho rekutanga,zveMOSFET ega parasitic parameters inoonekwa sechinhu chakakosha kukanganisa dunhu rekupa magetsi.
Pakarepo kutyaira kweMOSFET nemagetsi ekupa ICs
Yakanaka MOSFET mutyairi wedunhu ane zvinotevera zvinopihwa:
(1) Panguva iyo switch yagoneswa, dhiraivha yedhiraivha inofanirwa kukwanisa kuburitsa yakakura kwazvo ikozvino, kuitira kuti MOSFET gedhi-sosi yepakati-pole inoshanda voltage inosimuka nekukurumidza kune inodiwa kukosha, kuve nechokwadi chekuti switch inogona kushandurwa. pakukurumidza uye hapazovi nepamusoro-frequency oscillations pamucheto unokwira.
(2) magetsi switch on and off period, dhiraivha yedhiraivha inogona kuona kuti MOSFET gedhi sosi yepakati-pole inoshanda voltage inochengetwa kwenguva yakareba, uye inoshanda conduction.
(3) Vhara chinguva chedhiraivha yedhiraivha, inogona kupa yakaderera impedance chiteshi cheMOSFET gedhi sosi capacitance inoshanda voltage pakati pekukurumidza kudhiraivha, kuve nechokwadi chekuti switch inogona kukurumidza kudzimwa.
(4) Kuvakwa kwakapusa uye kwakavimbika kwedhiraivha maseketi ane kushomeka uye kubvaruka.
(5) Maererano nemamiriro chaiwo kuita dziviriro.
Mune yekudzora module magetsi ekupa, inonyanya kuzivikanwa ndeye magetsi ekupa IC yakananga kutyaira MOSFET. application, inofanirwa kutarisisa kune yakakura dhiraivha kukosha kwepamusoro kwekuyerera kwesimba, MOSFET kugovera capacitance 2 main paramita. Simba IC dhiraivha kugona, MOS kugovera capacitance saizi, dhiraivha resistor kuramba kukosha kuchaisa panjodzi MOSFET simba rekuchinja chiyero. Kana kusarudzwa kweMOSFET kugovera capacitance kwakakura, simba rekupa IC mukati mekutyaira kugona harina kukwana, rinofanira kunge riri mudhiraivha yekuvandudza kugona kwekutyaira, kazhinji shandisa totem pole magetsi emagetsi ekuwedzera simba rekupa IC drive kugona. .
Nguva yekutumira: Jul-25-2024
