Electrostatic Induction Generator Using Ceramic Electret for High-Temperature PCB Mounting
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Solution Overview
Problem
Conventional electrostatic induction generators using electret films face challenges with low heat resistance, making them unsuitable for mounting on printed boards due to reflow soldering temperatures, and require an external power supply for charge retention.
Innovation Solution
The design incorporates a pair of first electrodes and vibrating electrodes with opposite charges, and a second electrode for electrical connection, utilizing a three-layer structure with glass substrates and silicon vibrating substrates to generate power without an external power supply, using Au/Cr layers and insulating films for charge induction and collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electret film made of resin material is used to retain charges, then the generator can operate without an external power supply, but the heat resistance becomes too low to withstand reflow soldering temperatures
Solution Approach 1:
The invention changes the material parameter from resin-based electret film to ceramic-based electret material, which fundamentally alters the heat resistance property while maintaining the charge retention capability. This parameter change enables the generator to withstand reflow soldering temperatures of 250°C or higher.
Solution Approach 2:
The invention uses a composite structure where a ceramic electret material is integrated with electrode patterns on a substrate. This composite approach combines the charge retention properties of electret materials with the thermal stability of ceramic materials, resolving the contradiction between operational autonomy and heat resistance.
2Reliability
If voltage difference is applied to forcibly retain charges between electrodes, then charge retention is achieved, but an external electric power supply device is required
Solution Approach 1:
The ceramic electret material possesses inherent piezoelectric properties that enable it to generate and retain electrical charges autonomously through mechanical stress or polarization during manufacturing. This self-charging capability eliminates the need for external power supply devices while ensuring reliable charge retention for extended periods.
Solution Approach 2:
The invention replaces the mechanical/electrical system of external power supply with a materials-based solution using piezoelectric ceramic electret material. The material's intrinsic physical properties substitute for the need for external electrical equipment, simplifying the overall system while maintaining charge retention reliability.
3Ease of manufacture
If a simple electret film structure is used, then manufacturing is easier, but the generator cannot be mounted on printed boards due to low heat resistance
Solution Approach 1:
By changing the material composition from resin to ceramic, the invention fundamentally alters the thermal parameter, enabling the generator to withstand reflow soldering temperatures required for printed board mounting while maintaining ease of manufacture through standardized electrode pattern formation processes.
Solution Approach 2:
The composite structure of ceramic electret material with metal electrode layers creates a device that is both manufacturable using standard PCB techniques and adaptable for mounting on printed boards. The ceramic substrate provides thermal stability for soldering while the layered structure allows for straightforward fabrication.
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 allows for self-sustaining power generation without an external power supply and enables mounting on printed boards due to the high heat resistance of the electrode materials, effectively addressing the limitations of electret film-based generators.
Implementation Method 1
an electrostatic induction generator performing power generation with a vibration energy resulting from converting, into an electric energy, an energy having worked by applying charges to an electrode having a variable capacity to activate Coulomb attraction between opposed electrodes with the charges and vibrating a vibrator against the Coulomb attraction
Implementation Method 2
activating Coulomb attraction between opposed electrodes with the charges
Implementation Method 3
An electrostatic induction generator using an electret film capable of retaining quasi-permanent electrical charge
Data Source
AI summary
An electrostatic induction generator requiring no electric power supply device and capable of being mounted on a printed board is obtained. This electrostatic induction generator includes a pair of first electrodes capable of storing charges, a pair of vibrating electrodes capable of vibrating in a first direction and a second direction different from the first direction, and charged with opposite charges due to charges stored in the pair of first electrodes respectively, and a second electrode for electrically connecting the pair of vibrating electrodes to each other in a case where the pair of vibrating electrodes are at prescribed positions.