Electronic Pen Resonance Charging With Split Storage Capacitors
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Solution Overview
Problem
Electromagnetic induction type electronic pens face a trade-off between responsiveness and stable operation due to the capacitance of the storage capacitor, where increasing capacitance for energy accumulation slows response speed and decreasing it compromises stability.
Innovation Solution
Incorporating a larger capacitance third capacitor that accumulates excess energy when the rectified output voltage exceeds a predetermined value, allowing the second capacitor to have a smaller capacitance for faster response and maintaining stable operation by using the stored voltage from the third capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance of the storage capacitor is increased to accumulate more energy, then stable operation is improved, but the response speed deteriorates
Solution Approach 1:
The patent divides the single storage capacitor into two separate capacitors: a first storage capacitor connected to the rectifier circuit for fast charging and a second storage capacitor for accumulating excess energy. This segmentation allows each capacitor to have optimized capacitance values for their respective functions, resolving the contradiction between response speed and stable operation.
2Speed
If the capacitance of the storage capacitor is decreased to improve response speed, then responsiveness is improved, but stable operation deteriorates
Solution Approach 1:
By segmenting the storage capacitor function into two separate capacitors with different capacitance values, the first capacitor can be optimized for fast response (smaller capacitance) while the second capacitor ensures stable operation (larger capacitance for energy accumulation).
Solution Approach 2:
The patent introduces a charging control circuit that dynamically manages the charging process: the first storage capacitor charges quickly during initial contact, and when its voltage reaches a predetermined level, excess charging current is directed to the second storage capacitor. This dynamic control optimizes both response speed and stable operation.
3Quantity of substance
If a larger capacitance capacitor is used for energy accumulation, then energy storage capacity is improved, but the charging time increases
Solution Approach 1:
The patent segments the energy storage function into two capacitors with different roles. The first storage capacitor has smaller capacitance for fast initial charging, while the second storage capacitor has larger capacitance for accumulating excess energy. This segmentation enables the system to achieve both fast charging and large energy storage capacity.
Solution Approach 2:
The charging control circuit performs preliminary action by detecting when the first storage capacitor reaches a predetermined voltage level and then redirects excess charging current to the second storage capacitor. This preliminary control prevents the larger second capacitor from slowing down the initial charging response.
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 configuration enables the electronic pen to achieve both fast response speed and stable operation by effectively accumulating excess energy, ensuring continuous functionality even when energy received through the resonance circuit is reduced.
Implementation Method 1
an electronic pen is known which receives an electromagnetic wave from the position detecting device by a resonance circuit constituted of a coil and a capacitor
Implementation Method 2
a rectifier circuit which, in operation, rectifies an alternating-current signal received by the resonance circuit
Implementation Method 3
the parallel resonance circuit 3 performs the resonant operation
Data Source
AI summary
An electronic pen includes a coil wound around a magnetic core, a first capacitor forming a resonance circuit with the coil, a rectifier circuit which, in operation, rectifies an alternating-current signal received by the resonance circuit, the rectifier circuit including a second capacitor, a voltage detecting circuit which, in operation, detects whether a rectified output voltage across the second capacitor of the rectifier circuit exceeds a predetermined value, a third capacitor having a capacitance that is larger than a capacitance of the second capacitor, and a charge control circuit which, in operation, controls supply of a charging current to the third capacitor by the rectified output voltage. The charge control circuit in operation, causes the charging current to be fed to the third capacitor by the rectified output voltage when the voltage detection circuit detects that the rectified output voltage obtained across the second capacitor exceeds the predetermined value.