Ukuthini Ukubala Ukwehliswa Kwezindleko eVoltage Regulators

Uma ubek' ukuthanda ukwazi ukubala ukwehliswa kwamandla kwemigqa yokulawula uvoltage, uphumelelwe kudwebhise ephumangeni okuzokunikeza info kusuku, kusungula nokuthobela. Sizobona izinhloso eziphambene nokwehliswa kwamandla kwemigqa yokulawula uvoltage bese sikhombisa indlela yokubala ngokuhlanganisa izinyathelo. Sizobona futhi izinto eziphambene nokwehliswa kwamandla kwemigqa yokulawula uvoltage, nezinkomba ezithathwe ukuthula yona. Futhi, ukuthi ubeke ngqo kakhulu le ndlela, sizokunyeza izimpendulo eziqondisa ukubala ukwehliswa kwamandla kwemigqa yokulawula uvoltage.

Imiboniso ye-Power Dissipation ku-Voltage Regulators:

Ngaphambi kokuthi sibeke kakhulu kwezindlela zokwenza power dissipation ku-voltage regulators, uyakhiwa singaqonda yini le power dissipation. Power dissipation ithi ukuthi yini le mali esetshenziswa noma ikhishwa ku-heat lapho uhlobo (kuleli q embeni voltage regulator) usebenza.

IVoltage regulator iyindlela yokuvikela umehluko wevoltage kwezinhlobo ezithile zezinhlobo zombhane ngokuthi lezi zingasebenzisa amavoltiwe amakhulu noma angathandeki. Kusebenzweni kwemhleke voltage regulator, ipower isetshenziswa ngokushesha ngenxa yokuqondana nezinhfihlankomo kusistimu. Kukhona ukubaluleka ukubala le power dissipation kuvoltage regulators ukuze sithintwe ukuthi isetshenziswa kakhulu kuleli q embeni kanti kungase isetshenziswe ngokushesha.

Iskanza sokwenza isinyathelo ngasinyathelo:

Amandla okuthathwa ngumlawuli wevolthage ikwaziwa uma ivolthi lekugcina (Vin), ivolthi lokukhishwa (Vout), kunye nekugcina kwekurenti (Iload) ziyaziwa. Lo msebenzi wokubala umandla odityanisiweyo (Pdiss) wemlawuli wevolthage ngu le nto ngentla:

Pdiss = (Vin - Vout) x Iload

Nansi kwiindlela ezifanayo nezityenziswa kwiyaqo:

1. Sebenzisa ivolthi lekugcina (Vin) ubaleka ivolthi lokukhishwa (Vout). Oku kuya kunceda ukufumana ubungqina bevolthage bokwelapha kweyomlawuli.

2. Ubungqina bevolthage bokwelapha obuphinda-phindwe ngalo Iload. Le yinto ngu amandla odityanisiweyo kweyomlawuli wevolthage.

Unokwenza ngeke kwezi ntlobo nganye ye-Vin, Vout, kunye ne-Iload ukufumana umandla odityanisiweyo wemlawuli wevolthage.

Izinto ezibambisana nokungcola amandla kwiimlawuli zevolthage:

Kukho iinzame ezifewu eza kubangelisa ukungcola kwezandla kwiimlawuli zevolthage: ubungqina bevolthage phakathi kweyomlawuli, ikugcina kwekurenti, kunye nokusebenza kweyomlawuli.

1. Ukuhluka kwe-voltage: Khona okuphezulu kwe-voltage drop phakathi kwe-regulator, kube khona okuningi iphawer ye-dissipation. Kufanele kuthathwe i-low dropout voltage ngokuzimela ukukhetha i-voltage regulator ukuncipha ukusebenzisa iphawer.

2. I-Load current: Khona okuphezulu i-load current, kube khona okuningi iphawer ephathelene. Kukhona ukubaluleka ukukhetha i ISIBHOKISO SESITHULO (AVR) okwenzela amathela kwe-load current okwenzela leyo mphumela iyakusebenzisa.

3. I-Efficiency: Isikhundla esiprimary se-ukungcola iphawer kwi-voltage regulator yile efficiency yalo. Khona okuphezulu i-efficiency yalo, kube khona okuncane iphawer ethathwa njengesixa.

Yini indlela ukuncipha iphawer ephathelene kwezivikiro zokulawulisa voltage?

Le ngeke yindlela yokunceda ukuncipha iphawer ephathelene nokuzavoida ukunqamula kwezibovu kwe imodi yeqhayiso lokuhlala .

1. Khetha i-voltage regulator enenye le-dropout voltage nasekuphezulu kwe-efficiency ukuncipha ukungcola iphawer.

2. Ngezinkawu zokunqamula noma zezindleko zokunqamula, kungcola ukunqamula okuphezulu kanye nokuzavoida ukunqamulwa ngokuphezulu.

3. Khetha i-voltage regulators enemibandela njenge-overcurrent protection ukugcina isebenza esisemthethweni.

Izimpendulo ezithile zokugcina amandla kwiindlela zokulawulwa kwamandla:

Ukuchaza le ndawo, ake sithathe isibonelo esibonakalayo ukubala ukugcina amandla kwi- i-qhayiso lokuhlala :

Ake sithi sinezinhloso elawulwa ngamandla (Vin) ye-12V, isiphumo samandla (Vout) ye-5V, nekanda lokusebenza (Iload) ye-500mA. Ngokubala kwamandla okugcina kwezindawo zangaphambili:

Pdiss = (Vin - Vout) x Iload

Pdiss = (12V - 5V) x 500mA

Pdiss = 7V x 0.5A

Pdiss = 3.5W

Lapha 3.5W iyinkosi yamandla okugcina ekuhlangene nelawulo lamanzi. Ngokubala ukugcina amandla, ungena ngifisela lawulo lamanzi lisebenza kwiimathuba ezinhle zokugcina amandla kwaye ayiphumele kakhulu (umda wokugcina amandla onke).