Stylus Power Saving via Capacitor-Boost Converter Control
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Solution Overview
Problem
Active styluses face significant energy consumption issues due to the continuous operation of boost converter circuits even when not emitting signals, leading to delayed switching from power-saving mode to operational mode, which affects user experience.
Innovation Solution
Incorporating a control circuit that enables and disables the boost converter circuit based on voltage levels, using a capacitor to supply power when voltage is sufficient, and disconnecting the boost converter when voltage exceeds a certain threshold, allowing the capacitor to directly power the load circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the boost converter circuit continues to operate without load to maintain readiness, then the stylus can switch faster to operational mode, but the energy consumption increases significantly
Solution Approach 1:
The capacitor is pre-charged to a voltage higher than the battery voltage while the boost converter is off. When the stylus needs to operate, the capacitor immediately supplies power through the switch circuit, eliminating the need for the boost converter to be continuously on. This preliminary charging action enables fast switching without continuous energy consumption.
Solution Approach 2:
The capacitor acts as an intermediary energy storage device between the battery and the load circuit. It decouples the battery from the load, allowing the boost converter to be turned off during power-saving mode while the capacitor maintains the necessary voltage for rapid startup when needed.
2Use of energy by moving object
If the switch circuit is placed between the battery and boost converter circuit to turn off the boost converter, then the energy consumption is reduced, but the voltage from the battery takes a long time to be pulled up to higher voltage
Solution Approach 1:
The capacitor is pre-charged to a voltage higher than the battery voltage before power-saving mode. When the stylus needs to operate, this pre-charged capacitor immediately supplies power through the switch circuit, eliminating the voltage pull-up delay that would otherwise occur when turning on the boost converter.
Solution Approach 2:
The system alternates between charging the capacitor when the boost converter is on and using the capacitor when it is off. This periodic charging and discharging allows the capacitor to be ready for immediate use without requiring the boost converter to remain continuously on.
3Use of energy by moving object
If the capacitor voltage is used to directly power the load circuit when sufficient, then the energy consumption is reduced, but the system complexity increases due to voltage level management
Solution Approach 1:
The control circuit continuously monitors the capacitor voltage level and automatically switches between battery-powered boost converter mode and capacitor-powered direct supply mode. This feedback mechanism manages the voltage level transitions automatically, reducing the perceived complexity for the user while maintaining energy efficiency.
Solution Approach 2:
The system automatically manages its own power supply transitions without external intervention. The control circuit detects when the capacitor has sufficient charge and autonomously switches to capacitor-powered mode, and when the capacitor needs recharging, it switches back to boost converter mode, making the voltage management self-regulating.
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 solution enables faster switching between power-saving and operational modes while reducing energy consumption, thereby extending battery life and improving user experience by minimizing delays in stylus operation.
Implementation Method 1
a capacitor, coupled to the second end of the switch circuit, for storing and discharging electric power for solely supplying the load circuit
Implementation Method 2
a boost converter circuit, coupled to the battery, for increasing voltage of direct current outputted from the battery
Data Source
AI summary
The present invention provides a circuit system for saving power, including: a battery for supplying power; a boost converter circuit, coupled to the battery, for increasing voltage of direct current outputted from the battery; a switch circuit including a first end and a second end, the first end coupled to the boost converter circuit; a load circuit, coupled to the second end; a capacitor, coupled to the second end, for storing and discharging electric power for solely supplying the load circuit; and a control circuit, coupled to the boost converter circuit and the switch circuit, for implementing the following steps: if the voltage of the second end is less than a first voltage, enabling the boost converter circuit and having the switch circuit connect the first and the second ends; and if the voltage of the second end is larger than a second voltage, disabling the boost converter circuit and having the switch circuit disconnect the first and the second ends, wherein the second voltage is larger than the first voltage.