Power Supply Device Wireless Communication Interference
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Solution Overview
Problem
In power supply devices controlling power to loads, the electromagnetic coupling between primary and secondary circuits for communication purposes leads to radiating electromagnetic waves that deteriorate the accuracy of analog-to-digital conversion, resulting in unstable power supply due to interference with reference potentials.
Innovation Solution
A power supply device with a first circuit connected to a power source and a second insulated circuit, featuring an adjustment unit, a detection unit, a processing unit with a conversion unit, and communication units for wireless communication, where the control unit outputs a carrier wave intermittently to allow the processing unit to operate on stored power during conversion, preventing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If wireless communication is implemented between primary and secondary circuits using high-frequency carrier waves, then communication capability is improved, but electromagnetic radiation occurs which deteriorates A/D conversion accuracy
Solution Approach 1:
The control unit outputs carrier waves periodically with specific timing: during first and third periods for communication, and stops output during the second period when the detection unit performs A/D conversion. This periodic on/off action eliminates electromagnetic interference during critical measurement intervals while maintaining communication capability during other intervals.
Solution Approach 2:
The control unit outputs carrier waves in advance during the first period before the A/D conversion period begins. This preliminary action ensures communication data is transmitted and received before the sensitive measurement phase, preventing interference while maintaining communication functionality.
2Duration of action of stationary object
If continuous carrier wave output is used for communication, then communication continuity is improved, but electromagnetic interference with reference potential increases causing unstable power supply control
Solution Approach 1:
The system uses periodic carrier wave output with defined intervals (first period for output, second period for stopping, third period for output again). This periodic action balances communication needs with measurement stability, ensuring power supply control reliability by eliminating interference during A/D conversion while maintaining communication through scheduled intervals.
3Speed
If the detection unit operates during carrier wave output, then real-time detection is improved, but electromagnetic interference deteriorates detection accuracy
Solution Approach 1:
The detection unit performs A/D conversion during the second period when the control unit stops carrier wave output. This timing coordination allows the detection unit to operate without electromagnetic interference, ensuring high detection accuracy while maintaining real-time monitoring capability through the periodic measurement cycle.
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 stabilizes the power supply to loads by minimizing electromagnetic interference, thereby enhancing the accuracy of power detection and control, ensuring consistent power delivery.
Implementation Method 1
A high-frequency signal is used in communication between the primary circuit and the secondary circuit, causing an electromagnetic wave due to the high-frequency signal to radiate to space
Implementation Method 2
a power storage unit in the first circuit and configured to store power generated in the first communication unit and caused by the carrier wave
Data Source
AI summary
A power supply device includes a first circuit and a second circuit. The first circuit includes an adjustment unit, a detection unit, a processing unit including a conversion unit, a first communication unit, and a power storage unit. The second circuit includes a second communication unit performing wireless communication with the first communication unit, and a control unit outputting a carrier wave used in the wireless communication. After outputting the carrier wave during a first period, the control unit stops output of the carrier wave during a second period. During the second period, the conversion unit operates on the power stored in the power storage unit. The control unit outputs the carrier wave during a third period after the second period. During the third period, the processing unit transmits information about a conversion result. The control unit controls the adjustment unit based on the transmitted information.