Battery Charger Power Saving System Using Wake-Up Signal Threshold
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Solution Overview
Problem
Rechargeable batteries in electronic devices continue to supply power during transportation, leading to unnecessary power consumption when the devices are not in use, resulting in inefficient energy usage.
Innovation Solution
A power saving system that includes a first transistor, a counter, and an operation management circuit, which receives a wake-up signal to determine if the working period is longer than a time threshold, automatically turning off electronic components and switching between power saving and normal operation modes to conserve battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery continues to supply power to the electronic product during transportation, then the electronic product remains ready for use, but unnecessary power consumption occurs
Solution Approach 1:
The power saving system dynamically switches between power saving mode and normal operation mode based on the wake-up signal duration. The system transitions from a static power supply state to a dynamic state where power delivery is conditional upon the length of the wake-up signal, allowing optimization between readiness and energy conservation
Solution Approach 2:
The system changes the power consumption parameter by detecting the duration of the wake-up signal. When the signal duration exceeds a threshold, the system transitions from high power consumption (normal operation) to low power consumption (power saving) state, effectively controlling battery power usage based on operational parameters
2Reliability
If the wake-up signal duration is not properly detected, then the system cannot distinguish between temporary fluctuations and genuine power-on requests, but the system complexity increases
Solution Approach 1:
The counter circuit serves as an intermediary component that objectively measures the wake-up signal duration and provides a clear threshold-based output. This intermediary mechanism simplifies the overall control logic by converting the complex task of signal duration evaluation into a straightforward counting and comparison operation
Solution Approach 2:
The power saving system performs self-diagnosis by automatically detecting the wake-up signal duration and making autonomous decisions about power mode switching. The system uses its own internal resources (counter, operation management circuit) to evaluate external signals and regulate its power consumption without requiring external intervention or complex external control circuits
Data Source
AI summary
A power saving system of a battery charger is provided. A control terminal of a first transistor receives a wake-up signal. A counter is connected to a first terminal of the first transistor. The counter determines whether or not a working period of the wake-up signal from the first transistor is larger than a time threshold to output a counting signal. When the counting signal indicates that the working period of the wake-up signal is not larger than the time threshold, the counter and electronic components of an electronic device are turned off, thereby saving power of a battery. When the counting signal indicates that the working period of the wake-up signal is larger than the time threshold, the electronic device is switched from a power saving mode to a normal operation mode. In the normal operation mode, the battery can supply power to the electronic device.