Wireless Power Transfer Overvoltage Decoupling Circuit
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Solution Overview
Problem
Wireless power transfer systems face challenges in protecting components from sudden increases in output voltage, which can lead to component failure and damage due to variations in electric load, especially with delays in voltage regulation in contactless power transfer systems.
Innovation Solution
A wireless power transfer system incorporating a switching unit that decouples the electric load from the contactless power transfer unit if the second DC voltage exceeds a threshold value, using a controller and switches to regulate and protect the system from overvoltage, and includes a feedback loop for timely voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the switching frequency of the power converter is changed to regulate the output voltage, then the output voltage control is improved, but the response time is delayed causing voltage to exceed threshold before regulation can occur
Solution Approach 1:
The switching unit is configured to detect when the output voltage approaches the threshold value and proactively decouple the electric load before the voltage actually exceeds the threshold. This preliminary action prevents overvoltage from occurring in the first place, eliminating the need for corrective regulation after voltage excursion.
Solution Approach 2:
The switching unit applies a counter-action by decoupling the electric load when voltage approaches the threshold, preventing the harmful effect of overvoltage before it can damage components. This anticipatory protection counteracts the potential voltage surge that would otherwise occur with load disconnection.
2Adaptability or versatility
If the electric load is disconnected or varied, then the output voltage may suddenly increase to very high values, but this leads to component failure and damage
Solution Approach 1:
The switching unit detects when the output voltage approaches the threshold value and proactively decouples the electric load before the voltage actually exceeds the threshold. This preliminary action prevents overvoltage from occurring in the first place, eliminating the need for corrective regulation after voltage excursion.
Solution Approach 2:
The system continuously monitors the output voltage and uses this feedback signal to control the switching unit. When the voltage approaches the threshold, the feedback mechanism triggers the switching unit to decouple the load, creating a closed-loop protection system that responds dynamically to voltage conditions.
3Weight of moving object
If contactless power transfer is used, then the system becomes lighter and less bulky compared to contact-based systems, but the output voltage cannot be regulated in real-time leading to overvoltage risks
Solution Approach 1:
The switching unit acts as an intermediary protection mechanism between the contactless power transfer unit and the electric load. It monitors voltage conditions and selectively decouples the load when overvoltage is detected, providing protection without interfering with the contactless power transfer operation during normal conditions.
Solution Approach 2:
The system continuously monitors the output voltage and uses this feedback signal to control the switching unit. When the voltage approaches the threshold, the feedback mechanism triggers the switching unit to decouple the load, creating a closed-loop protection system that responds dynamically to voltage conditions.
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 system effectively prevents second DC voltage from exceeding critical values, protecting components from damage and ensuring stable operation even with changes in electric load, by employing a switching unit to decouple the load when voltage thresholds are exceeded.
Implementation Method 1
a contactless power transfer unit communicatively coupled to the first converting unit and configured to receive the input power having the AC voltage from the first converting unit and transmit the input power having the AC voltage
Implementation Method 2
a first converting unit configured to convert a first DC voltage of an input power to an AC voltage
Implementation Method 3
a second converting unit communicatively coupled to the contactless power transfer unit and configured to receive the input power having the AC voltage from the contactless power transfer unit, convert the AC voltage of the input power to a second DC voltage
Data Source
AI summary
A wireless power transfer system is disclosed. The wireless power transfer system includes a first converting unit configured to convert a first DC voltage of an input power to an AC voltage. Further, the wireless power transfer system includes a contactless power transfer unit configured to transmit the input power having the AC voltage. Also, the wireless power transfer system includes a second converting unit configured to convert the AC voltage to a second DC voltage and transmit the input power having the second DC voltage to an electric load. Additionally, the wireless power transfer system includes a switching unit configured to decouple the electric load from the contactless power transfer unit if the second DC voltage across the electric load is greater than a first threshold value.