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48-to-5/12 V Dual Output DC/DC Converter for High Efficiency and Small Form Factor in Electric Bike Applications
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- Authors
- Dong Yun Jung, Hyun Gyu Jang, Minki Kim, Junbo Park, Hyun Soo Lee, Chi Hoon Jun, Sang Choon Ko, Seok-Ho Son, Jong Mun Park
- Issue Date
- 2017-12
- Citation
- Electrical Design of Advanced Packaging and Systems Symposium (EDAPS) 2017, pp.2151-1233
- Language
- English
- Type
- Conference Paper
- Project Code
- 17HB3400, Development of 48V-to-5V/12V Dual Output Converter for Electric Bike with High Efficiency and Miniature Form Factor, Jung Dong Yun
- Abstract
- We propose a dual output dc/dc converter for high efficiency and small form factor in electric bike applications. To implement a converter with single input of 48 V and dual output of 5 V and 12 V, we propose the system architecture combined with a 48-to-12 V converter and a 12-to-5 V converter on single PCB. The input of the 12-to-5 V is connected to the output of the 48-to-12 V converter to obtain stable 5 V without regard to the battery voltage. For high efficiency, both converters use synchronous topologies. For small form factor, the switching frequencies of the converters are fixed to 300 kHz and 1 MHz, respectively. To minimize undesirable PCB noise, several resistors are added and signal paths are designed shortly. The proposed dual output converter was implemented to 45 mm × 42 mm size. When the input voltage of 48 V is supplied, the measure efficiency is 87.5 % under a full-load condition of 3.1 A at 5 V output and 2 A at 12 V output.
- KSP Keywords
- 2 mm, 48 V, Battery voltage, DC-DC Converters, Full-load, Input voltage, Load conditions, Single-input, System architecture, dual output converter, electric bike