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PIR-sensor-based lighting device with ultra-low standby power consumption

PIR-sensor-based lighting device with ultra-low standby power consumption,10.1109/IMTC.2011.5944114,Cheng-Hung Tsai,Ying-Wen Bai,Chun-An Chu,Chih-Yu C

PIR-sensor-based lighting device with ultra-low standby power consumption   (Citations: 1)
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In this paper we present a way to reduce the standby power consumption of a PIR-sensor-based lighting device. Generally although a PIR-sensor-based lighting device will turn on when motion is detected, and will turn off when the motion disappears, the device still consumes 1-3 W power when the lamp is off. In our design the device consumes 0.007 W when the light is off, and is not only easy to set up but also inexpensive. Our circuit supplies the lamp with power when motion is detected; when the motion disappears it turns the lamp off, and the electric power is shut off in order to reduce the standby power. We use an MCU which receives signals from a PIR sensor which detects any individual approaching the device. The MCU controls the SSR On/Off when used as a lighting switch for shutting off the standby power. The MCU monitoring program provides automatic detection of any individual by means of the PIR sensor. The MCU has internal modules to simplify the hardware circuit design. The circuit component count, cost and power consumption are low. The pyroelectric infrared (PIR) sensor-based lighting device is now in widespread use. This device with its built-in PIR sensor cuts the electricity when no user is near the PIR sensor. The PIR sensor turns the light on instantly when someone enters the room, and off after the individual exit. Thus a PIR-sensor-based lighting device saves one from fumbling for that light switch or leaving lights on for hours on end which is great for both energy saving, security and safety. And because the device only comes on when the PIR sensor is activated, no energy is wasted. The light is suitable for a number of locations, including the laundry room, attic, basement, pantry, closet, kitchen, path light, outdoor wall lantern, hallway, garage, bathroom and even children's rooms. But the device cannot be switched off completely without being unplugged. In this paper we define three states of the PIR-sensor-based lighting. In the standby state the lighting device is connected to a power source but does not produce light. In the active state the device's light is on when the PIR sensor is activated. The cut-off state means that the device is unplugged from its power source and does not consume any electricity. The lighting device in standby state draws power 24 hours a day. We call the power consumption, used while there is no light and the device is plugged in the power socket "standby power". This amount is typically small, but the sum of the standby power consumption of all PIR-sensor-based lighting devices within a household becomes significant (1)-(5). Though the lighting device in standby state is not performing its main function of lighting it is often performing some secondary function like sensing IR and ambient light that cannot be switched off unless the unit is unplugged. This secondary function requires not only a specific low DC voltage to operate but also a continuous power supplied by an AC/DC converter which has no power-off switch. The AC/DC converter as a power supply in the lighting device converts AC 120 V into low voltage DC for the secondary function operation (6). The AC/DC converter, which is very inefficient at low DC voltage, has a power consumption between 1 and 4 W, which is many times more than the power actually used for the secondary function. Therefore, in the long run, the PIR- sensor-based lighting device consumes much power while in the standby state. In 2000 the International Energy Agency (IEA) adopted a proposal to reduce the standby power of all electrical apparatus
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