Unique control schemes extend battery life in portable equipment

Author

Vargha, Doug

Author_Institution

Maxim Integrated Products, Sunnyvale, CA, USA

fYear

1993

fDate

28-30 Sep 1993

Firstpage

396

Lastpage

406

Abstract

New power conversion chipsets allow the newest generation of portable equipment to achieve smaller size, lower weight, and longer battery life, while still maintaining low cost. These new ICs provide high efficiency over a wide range of loads, have low-power standby modes and load management capabilities, and require only a small amount of board area. This paper describes some of these new ICs and their applications circuits. It presents a dual 3.3 V/5 V-output supply that is efficient over three decades of load currents. It discusses an integrated high-efficiency, cold cathode fluorescent tube (CCFT) backlight and LCD backplane power source. Also presented are intelligent battery chargers, embedded control for PCMCIA card slots, and minimum-power EIA232 transceivers with receivers active in shutdown

Keywords

PWM power convertors; battery chargers; computer power supplies; fluorescent lamps; liquid crystal displays; portable computers; portable instruments; rectifying circuits; secondary cells; 3.3 V; 5 V; LCD backplane power source; PCMCIA card slots; PWM power converters; battery life extension; cold cathode fluorescent tube backlight; control schemes; dual 3.3 V/5 V-output supply; embedded control; flash memory; high efficiency; intelligent battery chargers; load management capabilities; low-power standby modes; minimum-power EIA232 transceivers; portable equipment; power conversion chipsets; Backplanes; Batteries; Cathodes; Circuits; Costs; Fluorescence; Load management; Power conversion; Power generation; Transceivers;

fLanguage

English

Publisher

ieee

Conference_Titel

WESCON/'93. Conference Record,

Conference_Location

San Francisco, CA

ISSN

1095-791X

Print_ISBN

0-7803-9970-6

Type

conf

DOI

10.1109/WESCON.1993.488468

Filename

488468