Auto Wake-Up Circuit Using RC Timing for Auxiliary Modules
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Solution Overview
Problem
Conventional wake-up circuits in hand-held devices increase power consumption and circuit complexity, and incur additional costs and hardware volume due to the need for complex signal generation and timing correction for auxiliary modules during sleep mode.
Innovation Solution
An auto wake-up circuit comprising a main module, an auxiliary module, and a wake-up circuit module that uses a power storage device, charging unit, discharging unit, and comparing unit to generate control signals, allowing the auxiliary module to maintain operations during sleep mode while reducing costs and hardware volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wake-up circuits use base-band chip or additional watch-dog chip to generate wake-up signals for auxiliary modules during sleep mode, then the auxiliary functions can be maintained, but the power consumption increases and circuit complexity increases
Solution Approach 1:
The patent extracts the wake-up signal generation function from the base-band chip and implements it directly in the auxiliary module using a simple RC circuit. This removes the need for complex base-band chip involvement during sleep mode, reducing power consumption while maintaining auxiliary function reliability.
Solution Approach 2:
The auxiliary module generates its own wake-up signal using an internal RC circuit composed of a resistor, capacitor, and transistor. This self-service approach eliminates dependency on the base-band chip or additional watch-dog chip, reducing overall system power consumption while maintaining reliable wake-up functionality.
2Ease of operation
If base-band chip generates specific programmable hardware signals for wake-up of different auxiliary modules, then wake-up timing can be controlled, but circuit design complexity increases
Solution Approach 1:
Each auxiliary module contains its own RC circuit that automatically generates the required wake-up timing without external control. The resistor and capacitor values determine the timing, providing ease of operation through passive component selection rather than complex programmable logic.
Solution Approach 2:
The patent replaces complex programmable hardware signals with simple RC timing circuits using inexpensive passive components. This approach achieves wake-up timing control through basic electrical time constants rather than complex digital logic, significantly reducing circuit design complexity.
3Volume of moving object
If wake-up signals of RF chip are shared with auxiliary modules, then hardware volume can be reduced, but timing correction circuitry is needed which adds complexity
Solution Approach 1:
The patent extracts the timing generation function from the RF chip wake-up signal path and implements independent RC circuits in each auxiliary module. This eliminates the need for timing correction circuitry while maintaining compact hardware volume through decentralized timing generation.
4Device complexity
If watch-dog chip is added to generate wake-up signals for auxiliary modules, then wake-up signal generation is simplified, but manufacture cost increases and hardware volume increases
Solution Approach 1:
The patent replaces the expensive watch-dog chip with inexpensive passive RC components and a transistor already present in the auxiliary module. This achieves wake-up signal generation simplicity through basic electrical circuits rather than dedicated ICs, significantly reducing manufacture cost and hardware volume.
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
The auto wake-up circuit enables the electronic apparatus to maintain auxiliary functions during sleep mode, reducing manufacture costs and hardware volume, and allowing for adjustable operating duration of the auxiliary module.
Implementation Method 1
a power storage device; a charging unit, coupled to the power storage device, for charging the power storage device
Implementation Method 2
a comparing unit, coupled to the power storage device, for comparing a voltage of the power storage device with a predetermined voltage and generating the second control signal
Data Source
AI summary
The present invention relates to an electronic apparatus and an auto wake-up circuit thereof. The electronic apparatus comprises a main module for performing a main function of the electronic apparatus and generating a first control signal when the electronic apparatus enters a sleep mode; an auxiliary module, coupled to the main module, for performing an auxiliary function of the electronic apparatus and generating a second control signal; and a wake-up circuit module, coupled to the main module and the auxiliary module, for generating a third control signal based on the first control signal and the second control signal. The auxiliary module maintains the auxiliary function based on the third control signal while the electronic apparatus is in the sleep mode.