Motion Sensor Activation Circuit for Wireless Handheld Devices
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Solution Overview
Problem
Current wireless handheld mobile communication devices face inefficiencies in power management due to continuous power consumption by sensors for detecting re-activation signals, leading to unnecessary microprocessor re-activations and significant power drainage, especially from false positive interrupt requests.
Innovation Solution
A system comprising a motion sensor circuit, an input device, and a monitoring circuit that selectively activates the device to a higher power state only upon notable movement and a valid input signal, using a timing window and threshold filtering to minimize false activations and conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are continually powered to detect re-activation signals, then the device can respond to user actions, but power consumption increases and battery life decreases
Solution Approach 1:
The patent segments the sensor system into two distinct components: a low-power motion sensor that operates continuously to detect device movement, and a higher-power input device sensor that is activated only when motion is detected. This segmentation allows the system to maintain re-activation detection capability while significantly reducing overall power consumption by keeping only the essential low-power sensor active during sleep mode.
Solution Approach 2:
The patent implements preliminary action by having the low-power motion sensor detect device movement before activating the higher-power input device sensor. This preliminary detection ensures that the system is ready to respond to user actions while avoiding the continuous operation of power-intensive components, thus resolving the contradiction between reliable detection and power consumption.
2Ease of operation
If the microprocessor is fully re-activated upon IRQ signal, then the device can process user inputs, but unnecessary re-activations cause significant power drainage
Solution Approach 1:
The patent applies preliminary action by using the low-power motion sensor to detect device movement before activating the input device sensor and generating an IRQ signal. This ensures that the microprocessor is only fully re-activated when there is actual user intent, preventing unnecessary re-activations and associated power drainage while maintaining ease of operation for legitimate user inputs.
Solution Approach 2:
The patent introduces the motion sensor as an intermediary between the input device sensor and the microprocessor. This intermediary layer filters out spurious signals by requiring both motion detection and input device activation before triggering a microprocessor re-activation, thus reducing unnecessary energy loss while preserving proper user input processing.
3Adaptability or versatility
If false positive IRQ signals are generated, then the device may respond to unintended movements, but unnecessary microprocessor re-activations occur
Solution Approach 1:
The patent segments the detection process into two independent stages: motion detection by the low-power sensor, and input device activation by the higher-power sensor. This segmentation allows the system to maintain adaptability by responding to legitimate user actions while improving reliability by requiring both conditions to be met, thereby filtering out false positives that would trigger unnecessary microprocessor re-activations.
Solution Approach 2:
The motion sensor serves as an intermediary that validates whether device movement has occurred before allowing the input device sensor to trigger an IRQ signal. This intermediary layer significantly reduces false positive rates by ensuring that only movements accompanied by actual input device activation will cause microprocessor re-activation, thus improving reliability while preserving the device's ability to respond to intended user actions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces unnecessary re-activations of the microprocessor, thereby enhancing power management by ensuring that the device only transitions to a higher power state when intended by the user, thus conserving battery life and reducing power consumption.
Implementation Method 1
a motion sensor circuit...detects a notable movement of the device
Data Source
AI summary
The invention provides a system and method for activating an electronic device from a low power state. In the system, an activation circuit for an electronic device is provided. The circuit comprises: a motion sensor circuit; an input device; and a monitoring circuit connected to the input device. The monitoring circuit provides power to the input device when the motion sensor circuit detects a notable movement of the device and selectively generates an activation signal used to activate the electronic device to a higher power state in response to receiving a notable signal received from the input device.