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Vol. 17, Special Issue, December 2012, pp. 199-207


Selected papers from the 4th International Conference on Intelligent & Advanced Systems (ICIAS' 2012),

12-14 June 2012, Malaysia, Kuala Lumpur




Power Management for USB2.0 5 V Supply Using Load Resistive and Switch Capacitive Detection Approach
Tan Thiam Loong, Dr. Anwar Hasni bin Abu Hassan

School of Electrical and Electronics Engineering, University Sains Malaysia (USM)

Penang, Malaysia.

Tel.: +60176990235, E-mail: thiamlong@hotmail.com, anwar@eng.usm.my

Digital Sensors and Sensor Sysstems


Abstract: This paper deals with two proposed power management circuitries for USB 5V supply are demonstrated by using the current sense amplifier and mosfet switches architecture. There are some power losses in switched-mode power supply (SMPS) when supplying 5 V to the USB port in board level design. The total amount of losses in reference board for 5 V SMPS is measured which consumes 21 mW. Two proposed detection circuitries which are load resistive and switch capacitive are used to save the power losses in SMPS. The simulation results for the power consumption of load resistive approach consume 2 mW whereas for switch capacitive approach consumes 7.5 mW when the 5 V SMPS is switched off.  The load resistive and switch capacitive approaches will save total amount of 19 mW and 13.5 mW respectively in reference board. The load resistive approach has been implemented using breadboard and printed circuit board (PCB) and the total power saving is 18.5 mW.


Keywords: SMPS, USB2.0



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