Power Saving Mode Control for Electronic Apparatus
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Solution Overview
Problem
Existing electronic apparatuses face challenges in reducing power consumption without compromising functionality, especially in modes with different power consumption levels, as upgrading the wake-up function section increases power consumption, and stopping it reduces functionality.
Innovation Solution
An electronic apparatus with a processor operating in normal and power-saving modes, a control section issuing power-saving mode control commands, and a power source managing integrated circuit adjusting supply electric power and voltage accordingly, allowing for selective power management and voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wake-up function section operates with upgraded functionality, then the wake-up function is improved, but the power consumption is increased
Solution Approach 1:
The power supply system is segmented into multiple independent power source outputs, allowing selective powering of the wake-up function section independent from other circuits. This enables the wake-up function to operate with full capability while other non-essential circuits remain powered down, resolving the contradiction between maintaining wake-up functionality and reducing overall power consumption.
2Use of energy by moving object
If circuits other than wake-up function section stop in standby mode, then the power consumption is reduced, but the functionality is reduced
Solution Approach 1:
The system dynamically adjusts power supply to different circuit sections based on operational mode. In standby mode, the power source managing integrated circuit selectively maintains power to the wake-up function section while cutting power to other circuits. This dynamic power management preserves essential wake-up functionality while minimizing power consumption, avoiding the need to completely stop all non-processor circuits.
3Use of energy by moving object
If voltage of digital circuit is reduced, then the power consumption is reduced, but the leakage current occupies increased portion of consumption current
Solution Approach 1:
The wake-up function section is extracted as a separate power domain with independent power supply control. By taking out this critical function from the general digital circuit power management, the system can apply different power management strategies: full voltage to the wake-up section to minimize leakage current ratio, and reduced voltage or complete power cutoff to other circuits to minimize overall power consumption.
Data Source
AI summary
It is desirable to reduce power consumption without reducing a function in an electronic apparatus operating in a plurality of modes different in power consumption from one another.A processor operates in a normal mode, in which power consumption is higher, of two modes different in power consumption from each other, and stops operation in a power saving mode, in which the power consumption is lower, of the two modes. A control section outputs a power saving mode control command instructing an increase or decrease of a supply electric power to a digital circuit different from the processor in the power saving mode. A power source managing integrated circuit increases or decreases the supply electric power to the digital circuit in accordance with the power saving mode control command, and outputs the increased or decreased supply electric power.