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Power Saving Architecture for Point of Sale Terminal

IP.com Disclosure Number: IPCOM000115156D
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Kirk, CR: AUTHOR [+2]

Abstract

The Environmental Protection Agency (EPA) has initiated a voluntary program, Energy Star, aimed at increasing the energy efficiency of computer products. In order for a product to be certified with the Energy Star logo, a system unit must consume less than 30 watts input power during an idle state of operation. The Point of Sale (POS) terminal is required to provide a fully functioning Ethernet communication port while operating in an Energy Star idle state. Since the typical input power consumption of a fully functioning POS terminal is greater than 250 watts our problem is to find an efficient method for lowering the power consumption while maintaining the required idle state functions.

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Power Saving Architecture for Point of Sale Terminal

      The Environmental Protection Agency (EPA) has initiated a
voluntary program, Energy Star, aimed at increasing the energy
efficiency of computer products.  In order for a product to be
certified with the Energy Star logo, a system unit must consume less
than 30 watts input power during an idle state of operation.  The
Point of Sale (POS) terminal is required to provide a fully
functioning Ethernet communication port while operating in an Energy
Star idle state.  Since the typical input power consumption of a
fully functioning POS terminal is greater than 250 watts our problem
is to find an efficient method for lowering the power consumption
while maintaining the required idle state functions.

      A system power architecture is developed such that the system
can switch off power to all of the devices external to the system
unit.  These devices include; keyboards, printer, scanners, displays,
cashdrawers, CRT, etc..  None of these devices are necessary for
maintaining the systems ability to communicate via an Ethernet port.
Power to the system motherboard and the adapter cards is maintained
during the Energy Star idle state.  The segregation and distribution
point of the switched and unswitched output power is maintained
within the power supply.  Therefore, the system unit planar card can
maintain a common chip set as other products in this same family of
POS terminals.

      The Figure shows a block diagram representation of the system
power architecture.  The ON/IDLE control signal is...