Infrared Receiver Circuit Power Saving Wake Up
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Solution Overview
Problem
Custom infrared receivers face challenges in waking up electronic devices from power-saving mode while independently and correctly receiving infrared transmission data without a header in the IR signal, which complicates power consumption reduction efforts.
Innovation Solution
A data-receiving circuit and method that omits the header in IR signals, using a first and second register, a decoder, and control circuit to capture and compare control data and endpoint data, generating signals to wake up electronic devices from power-saving mode by matching target values and bit counts, allowing for successful IR signal reception and device activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the infrared receiver operates in power-saving mode to reduce power consumption, then power consumption is reduced, but the ability to independently and correctly receive infrared transmission data without a header deteriorates
Solution Approach 1:
The patent divides the data reception process into multiple stages using separate registers: a first register for storing target values, a second register for storing lengths, and a data register for storing received control data. This segmentation allows the system to independently verify data integrity through comparison operations while in power-saving mode, resolving the contradiction between low power consumption and reliable data reception.
Solution Approach 2:
The patent performs preliminary actions by pre-storing target values and length information in registers before entering power-saving mode. When an infrared signal is received, the system can immediately compare the received data against these pre-prepared reference values without needing to process a header, enabling reliable wake-up from power-saving mode while maintaining low power consumption.
2Device complexity
If the header is omitted in the IR signal to simplify the reception process, then the reception complexity is reduced, but the reliability of wake-up signal detection deteriorates
Solution Approach 1:
The patent implements feedback mechanisms through comparison circuits that compare received control data against target values stored in the first register. This feedback loop verifies data integrity even without a header, ensuring reliable wake-up signal detection while maintaining simplified signal processing. The system can confirm successful reception through the comparison results and endpoint data validation.
3Speed
If the data register is not emptied after receiving IR signal, then the reception speed is maintained, but the ability to receive subsequent IR signals deteriorates
Solution Approach 1:
The patent implements periodic action by automatically emptying the data register based on endpoint data detection. This periodic clearing operation ensures the data register is ready for subsequent infrared signals while maintaining high reception speed. The emptying action is triggered periodically when endpoint data is detected, creating a rhythmic reception pattern that balances speed and readiness for future signals.
Data Source
AI summary
A data-receiving circuit adapted to an electronic device is provided herein. The electronic device receives a power-saving signal to operate in a power-saving mode. The data-receiving circuit includes a first register, a second register, a decoder, a data register, and a control circuit. The first register is configured to store a target value. The second register is configured to store the length of the target value. The decoder captures control data and endpoint data from an IR signal. The data register is configured to store the control data. The control circuit empties out the data register according to the power-saving signal and the endpoint signal.