Contactless Power Activation Circuit for Outdoor Electronic Devices
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Solution Overview
Problem
Electronic devices used outdoors face issues with water ingress and corrosion, and existing radio wave-based power activation systems can lead to erroneous operations due to noise interference.
Innovation Solution
An information collection circuit with a detection circuit, rectification circuit, and semiconductor switches that utilize contactless power transfer and resonance circuits to activate and control the device, reducing noise interference and ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a power switch is used to turn on the power, then the device can be activated, but water may enter through the exposed power switch and corrode metal portions
Solution Approach 1:
The patent replaces the mechanical power switch with a contactless power activation system using electromagnetic induction. A coil generates an electromagnetic field that induces current in a conductor within the battery, activating the device without any exposed mechanical components. This eliminates the vulnerability to water ingress while maintaining power activation functionality.
2Ease of operation
If a receiver receives radio waves to activate power supply, then the device can be activated contactlessly, but noise from other transmitters may cause erroneous operation
Solution Approach 1:
The patent segments the power activation function into two distinct parts: a coil for generating electromagnetic field and a separate conductor within the battery for receiving the induced current. This segmentation allows the system to respond only to specific electromagnetic signals that match its resonant frequency, filtering out noise from other transmitters and preventing erroneous activation.
3Ease of operation
If radio waves are used for power activation, then contactless operation is achieved, but noise from similar radio waves may activate power supply unintentionally
Solution Approach 1:
The patent changes the parameter of electromagnetic signal interaction by using electromagnetic induction through a coil and conductor rather than radio wave reception. This approach uses localized electromagnetic field coupling with specific frequency characteristics, making the system insensitive to ambient radio wave noise while maintaining contactless activation capability.
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 solution enables reliable and noise-resistant operation of electronic devices outdoors by using semiconductor switches and resonance circuits for contactless power activation, preventing corrosion and erroneous operations.
Implementation Method 1
a rectification circuit that rectifies electromotive force generated at a coil by an external magnetic field or an external electric field
Implementation Method 2
The first semiconductor switch becomes conductive based on a DC voltage generated by the rectification circuit
Data Source
AI summary
An information collection circuit includes a control circuit, which collects information of a measurement subject from a detection circuit, and a rectification circuit, which rectifies electromotive force. A first switch, coupled between the rectification circuit and the control circuit, becomes conductive based on DC voltage generated by the rectification circuit. A second switch, coupled between the control circuit and a battery, becomes conductive based on a control signal provided from the control circuit. The second switch is non-conductive when the control circuit is inactive. The control circuit is activated by a first power voltage supplied via the first switch to control the second switch to become conductive, and is operated based on a second power voltage supplied from the battery via the conductive second switch.