Capacitive Stylus Power Saving via Dynamic Voltage Regulation
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Solution Overview
Problem
Capacitive styluses consume excessive electrical energy due to continuous operation at high voltages and speeds, which is unnecessary for all operations, leading to inefficient power usage.
Innovation Solution
A capacitive stylus with a power saving apparatus that includes a controller, switch circuit, and power circuit, which regulates or converts voltage from a power source to either a higher or lower voltage based on operational requirements, using GPIO signals to control the power circuit and supply the necessary voltage to the controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitive stylus operates continuously at high voltages and speeds, then the detection and output operations can be maintained, but the electrical energy consumption increases excessively
Solution Approach 1:
The patent applies dynamics by making the operating voltage of the microcontroller variable rather than fixed. The power circuit dynamically adjusts the voltage based on operational needs - switching between first voltage (higher) for detection operations and second voltage (lower) for other operations. This dynamic voltage adjustment maintains reliable detection when needed while reducing power consumption during non-detection phases.
Solution Approach 2:
The patent changes the voltage parameter of the microcontroller based on operational requirements. The controller outputs first signals to regulate voltage to the first voltage level when detection is required, and second signals to regulate voltage to the second voltage level when detection is not required. This parameter change resolves the contradiction by adapting the voltage level to the current operational state.
2Productivity
If the microcontroller operates at higher voltages and speeds continuously, then processing speed and detection accuracy are maintained, but unnecessary electrical power is consumed
Solution Approach 1:
The patent implements periodic action by alternating between high-voltage operation modes and low-voltage operation modes. The power circuit receives periodic control signals from the controller, switching between first voltage and second voltage based on whether detection operations are currently required. This periodic voltage adjustment maintains processing speed when needed while conserving energy during intervals when detection is not required.
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 capacitive stylus effectively reduces electrical power consumption by operating at lower voltages and speeds when higher voltages are not necessary, thereby conserving energy while maintaining functionality.
Implementation Method 1
The switch circuit controls the power circuit to regulate or convert a voltage from a power source to a first voltage or a second voltage according to the first signal or the second signal
Data Source
AI summary
A capacitive stylus with a power saving apparatus is disclosed. The capacitive stylus uses a controller to output signals to control a power circuit to regulate or convert a voltage from a power source to different working voltages for the controller so as to save electrical power of the capacitive stylus.