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Design Team Design Team 55
Lowering Standby Power Lowering Standby Power Consumption Via Consumption Via
Proximity DetectionProximity Detection
Kevin Harrison
Leslie Hodges
Eric Hosey
Nathan Kelly
Berna Saracoglu
• Anticipated ENERGY STAR standard– Appliances need to operate under one
watt in standby mode– Current appliances do not utilize
standby mode– Standby mode would diminish customer
experience
• Need to smoothly enter and exit an energy ethical standby mode to lower energy consumption
The The ProblemProblem
• Detection of user presence– Implement a variety of
sensors for in room and potential appliance use detection
• Low-to-mid range and High-end options– Laundry and kitchen
appliances– Cost differences– User experience
When you walk When you walk into your kitchen, into your kitchen, your kitchen turns your kitchen turns
onon
Our Our GoalGoal
• Power– Less than 1 watt in standby mode
• Size– Fit aesthetically into appliance and room
• Cost– Limitations dependant on appliance price
• Flexibility– Adapt intelligently to different environments– Current and future appliances
• Accuracy– Not interfere with appliance functionality– Not susceptible to interference
• Safety– Product used by general public
Design Design SpecificationsSpecifications
Low-to-Mid Range• Two sensors
– Passive infrared (PIR) sensor• Monitors room for user presence
– Active infrared (IR) sensor• Monitors for potential use of appliance
• Integration– In standby mode PIR will monitor room– Detection of user will turn on IR sensor– Detection of potential use will exit from
standby mode
Design Design SolutionsSolutions
High-End• Two sensors
– Passive infrared sensor• Monitors room for user presence
– Ultrasonic sensor• Capable of calculating user proximity• Information density
• Integration– In standby mode PIR will monitor room– Detection of user will turn on ultrasonic sensor– Will exit standby mode as user approaches appliance
Design Design SolutionsSolutions
IR Sensor• Very low cost• Detection up to 4 ft
– Very little span• Consumption less than 0.2
W• No false triggers
Ultrasonic Sensor• Detection up to 20 ft
– Span of appliance width• 10 mW consumption• Susceptible to false-on
triggers from air motion
Sensor Sensor SelectionSelection
PIR Sensor• Power consumption of 0.5 mW• Very low cost• Detection up to 20 ft
– 180° hemispheric detection• Resistant to false-on triggers• Ideal for both design solutions
Sensor Sensor SelectionSelection
• Expected 1 watt standard• Currently can save 35% with
refrigerator user interface
Power Power ConsumptionConsumption
• Voice commands– Physically disabled– Safety
• Voice announcements– Visually impaired– Appliance status
• LCD solution– More common in future– Proximity sensing improves power
consumption and marketability
Future of Future of ProductProduct