Digital assistant current sensor for PWM DC-DC converter with segmented output stage

Author

Ping Luo ; Jianluo Chen ; Ming Luo ; Yi-Kun Mo

Author_Institution

State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

2

fYear

2013

fDate

15-17 Nov. 2013

Firstpage

358

Lastpage

361

Abstract

A digital assistant sensor in PWM converter with segmented output stage is proposed in this paper. The output stage is segmented according to the load current, especially segmented in light loads condition. Conversional current sensor in a power integrated converter is not accurate enough for the light loads. A segmented current sensor (SCS) allying a time digital converter (TDC) is proposed to sensor the load current at light load condition in discontinuous current mode (DCM) in this paper. The SCS detects the load current in continuous current mode (CCM). Hence, refined segmented output stage can be obtained for optimized efficiency. The structure of the proposed digital assistant current sensor is described in this paper. And the PWM converter with the adaptive segmented output stage is designed and simulated in a 0.13μm standard CMOS process. The simulation results show that the maximum efficiency improvement of the proposed converter reaches 8% compared to converter without segment.

Keywords

CMOS integrated circuits; DC-DC power convertors; PWM power convertors; electric current measurement; electric sensing devices; time-digital conversion; PWM DC-DC converter; digital assistant current sensor; discontinuous current mode; light loads condition; load current; maximum efficiency improvement; power integrated converter; refined segmented output stage; segmented current sensor; size 0.13 mum; standard CMOS process; time digital converter; Delays; Logic gates; MOSFET; Pulse width modulation; Pulse width modulation converters; Simulation; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems (ICCCAS), 2013 International Conference on

Conference_Location

Chengdu

Print_ISBN

978-1-4799-3050-0

Type

conf

DOI

10.1109/ICCCAS.2013.6765356

Filename

6765356