Razvoj stikalnega napajalnika za ogrevalne svečke dizelskih motorjev

RAKUŠČEK, TILEN (author), Jankovec, Marko (mentor)

Cilj magistrskega dela je razvoj, testiranje in izdelava stikalnega napajalnika za ogrevalne svečke dizelskih motorjev. Napajalnik uporablja vir električne napetosti v vozilu in skrbi za pravilno napajanje štirih ogrevalnih svečk za dizelske motorje Hidria PSG, ki so nameščene v blok motorja. Svečke napaja na ukaz računalnika v vozilu in mu pošilja povratne informacije o stanju napajanja. Najprej smo preučili zgradbo in delovanje ogrevalne svečke za dizelske motorje s senzorjem tlaka Hidria PSG. Z dobljenimi rezultati in z upoštevanjem želja naročnika je bil izdelan seznam načrtovalskih zahtev za namenski stikalni napajalnik. Napajalnik mora delovati pri vhodnih napetostih med 16 V in 32 V. Vsak izmed dveh izhodov napaja dve ogrevalni svečki Hidria PSG s konstantno izhodno napetostjo 4,4 V in največjim tokom 15 A. Izhodi napajalnika so aktivni samo kadar je na priključku ST pravokotni signal s frekvenco 32 Hz med 0 V in 7 V ter 50 % delovnim ciklom, ki ga ustvari računalnik v vozilu. Če se oba izhoda nahajata v 10 % območju nastavljene izhodne napetosti, je signal diagnostike v visokem stanju. V primeru prevelikega toka na katerem izmed izhodov, krmilnik izhod izklopi. Drugi izhod v takem primeru ostane aktiven, diagnostika na nizkem potencialu. Ohišje in razpoložljivi priključki napajalnika so že vnaprej določeni. Preiskani so bili namenski krmilniki na tržišču. Uporabljen je bil krmilnik MAX17559 s tokovnim načinom krmiljenja, ker je bilo ocenjeno, da je najbolj primeren za takšen idelek. V programu Altium Designer je bila načrtovana shema upoštevajoč načrtovalske zahteve, v programu EE - Sim SE je bila izvedena simulacija delovanja. Izbrane so bile vse potrebne komponente za sestavo napajalnika. Izdelano je bilo tiskano vezje, ki smo ga vstavili v ohišje. Testirano je bilo delovanje napajalnika in dodatnih funkcij, opravljene so bile tudi meritve sevalnih emisij. Rezultat je razvit in izdelan A vzorec stikalnega napajalnika za ogrevalne svečke dizelskih motorjev Hidria PSG, ki je bil poslan kupcu v potrditev funkcionalnosti izdelka.

• Language: Slovenian
• Keywords: stikalni napajalnik, tokovna regulacija, ogrevalne svečke, Hidria PSG
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2018
• PID: 20.500.12556/RUL-103741
• Publication date in RUL: 24.09.2018

Secondary language

• Language: English
• Title: Development of a switch-mode power supply for the diesel engine glow plugs

Abstract

Purpose of this master’s thesis is a development, testing and production of a switch-mode power supply for the diesel engine glow plugs. The device uses source of the electrical power in the vehicle and correctly supplies the energy to the four glow plugs for diesel engines Hidria PSG, located in the motor block. Computer in the vehicle gives the signal when the supply of the glow plugs is needed, device gives a feedback to the computer about the supply status. At first, construction and operational characteristics of glow plug for diesel engines with pressure sensor Hidria PSG were investigated. Using the results and considering the customer’s wishes, a list of design requirements for switch-mode power supply was made. The power supply has to operate at input voltages from 16 V to 32 V. Each of the two outputs powers two glow plugs Hidria PSG with a constant voltage of 4,4 V and maximum current of 15 A. Outputs are active only when a 32 Hz square signal with 7 V amplitude and 50 % duty cycle is generated by the computer in the vehicle, connected to the ST connector. Diagnostics signal is high if both output voltages are in 10 % range of the pre-set voltage. If an overcurrent is detected, controller switches the output off. In this case the second output is still active, diagnostic signal is low. Housing of the product and the connectors were defined before. After the research of available controllers, decision to use MAX17559 with current mode control was made because it was recognized as the most suitable for this product. Having in mind the design requirements the schematics in Altium Designer and behaviour simulation in EE – Sim SE simulator was done. All the components needed for the switch-mode power supply were chosen. Printed circuit board was made and housed. Behaviour, additional functions and radiated emissions of power supply were tested. The result is developed and produced A prototype of switch-mode power supply for the diesel engine glow plugs Hidria PSG, which was sent to the buyer to confirm the functionality of the product.

• Keywords: switch-mode power supply, current mode control, glow plugs, Hidria PSG