Načrtovanje elektronskega vezja za baterijsko napajan kuhinjski mešalnik

TANŠEK, TADEJ (author), Jankovec, Marko (mentor)

V diplomski nalogi je predstavljeno načrtovanje vezij za delovanje prenosne polnilne baterijske mešalne naprave (blender − električni mešalnik). V začetnem delu naloge pregledamo zgodovino razvoja Li-ion baterij, lastnosti tehnologije in z njo povezane omejitve. Pri polnjenju Li-ion baterij je zelo pomembno omejevanje toka in napetosti, ki morata biti pravilno izvedena, da ne pride do poškodb ali uničenja baterij. Celotni sistem mešalnika sestavlja pet sklopov: zunanji stikalni napajalnik, vezje tokovno napetostnega regulatorja, vezje za uravnoteženje polnjenja ter krmiljenje motorja, baterija in krtačni motor. Osrednji del naloge predstavljata načrtovanje in izvedba vezja tokovno napetostnega regulatorja in vezja za uravnoteženje polnjenja ter krmiljenje motorja. Kot najbolj ustrezno rešitev za izvedbo tokovno napetostnega regulatorja smo izbrali integrirano rešitev MAX1737. MAX1737 je cenovno ugodno in visoko učinkovito namensko integrirano vezje za polnjenje Li-ion baterij. Vezje za uravnoteženje polnjenja in krmiljenje motorja smo izvedli v pasivni izvedbi ob podpori mikrokrmilnika ATmega16. Ob polnjenju izvajamo meritve napetosti posameznih celic in z uporabo premostitvenih mostičev upočasnjujemo polnjenje bolj napolnjenih celic ter tako poskrbimo za uravnoteženje celotne baterije.

• Language: Slovenian
• Keywords: Li-ion baterije, Li-ion polnilec, Li-ion polnjenje, uravnotežen polnilec, stikalno omejevanje toka, stikalno omejevanje napetosti, MAX1737, baterijski kuhinjski mešalnik
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-84766
• Publication date in RUL: 02.09.2016

Secondary language

• Language: English
• Title: Design of an electronic circuit for a battery-powered kitchen blender

Abstract

This thesis focuses on development of electronic printed circuit boards for a battery-powered kitchen blender. In the beginning we review the Li-ion technology, its specifications and electrical characteristics. We take a close look at charging voltage and charging current limitations. This limitations need to be closely observed and monitored to provide stable and safe operation of Li-ion cells. The system of portable battery powered kitchen blender could be divided into five segments: external switch-mode power supply, printed circuit board of current and voltage limiter, printed circuit board of battery balancer and motor driver, blender’s main motor. The major challenge of this thesis represent the development of printed circuit board of current and voltage limiter and printed circuit board of battery balancer and motor driver. For development of voltage and current limiter we used readily available solution MAX1737. MAX1737 is price adequate and represents high efficiency solution for charging Li-ion batteries. Battery balancer and motor driver is realized with usage of ATmega16 microcontroller, which is sensing the voltage of every single cell. In event of cell overvoltage in regarding to average cell voltage of battery, the part of the charging current is redirected through cell bypass. Use of bypass provides slower charging of individual cells end enables battery balancing.

• Keywords: Li-ion battery, Li-ion charger, Li-ion charging, battery balancer, switch-mode current limiting, switch-mode voltage limiting, MAX1737, battery powered kitchen blender