Wireless Power Overvoltage Protection via Resonant Circuit State Switching
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Solution Overview
Problem
Wireless power transfer systems face challenges in protecting circuit components from overvoltage conditions due to communication failures or component malfunctions, which can lead to voltage runaway and potential damage.
Innovation Solution
A wireless power transfer overvoltage protection system is introduced, featuring a resonant receiving circuit with an inductor, resonant capacitor, and a switching device controlled by a module that switches between states to prevent overvoltage by short-circuiting the inductor when preset conditions are met, using relays or semiconductor devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the resonant receiving circuit operates in resonant mode to enable wireless power transfer, then power transfer efficiency is improved, but the risk of overvoltage damage to circuit components increases when communication fails or components malfunction
Solution Approach 1:
The patent applies preliminary anti-action by proactively introducing a protection circuit and control module before overvoltage conditions can cause damage. The control module continuously monitors system state and preemptively activates the protection circuit when communication failure or component malfunction is detected, preventing voltage runaway before it occurs. This resolves the contradiction by maintaining resonant operation for efficient power transfer while having preventive measures ready to counteract the overvoltage hazard.
Solution Approach 2:
The patent uses an intermediary protection circuit positioned between the resonant receiving circuit and the load. This intermediary component includes a switching device that can isolate or short-circuit the resonant receiving circuit when overvoltage conditions are detected. The intermediary acts as a buffer that allows the resonant circuit to operate efficiently while protecting downstream components from voltage damage, thus resolving the contradiction between power transfer efficiency and overvoltage risk.
2Reliability
If a protection circuit is added to prevent overvoltage damage, then component safety is improved, but system complexity increases
Solution Approach 1:
The patent merges the protection function with existing system components by integrating the control module into the wireless power transfer system's existing control architecture. The protection circuit shares the resonant receiving circuit components (inductor, capacitor, switching device) with the power transfer function, eliminating the need for completely separate protection hardware. This merging approach improves component safety while minimizing the increase in system complexity.
Solution Approach 2:
The control module serves multiple functions: it manages the normal operation of the resonant receiving circuit for power transfer, monitors communication status between transmitter and receiver, detects component malfunctions, and activates protection mode when needed. By making the control module universal and multi-functional, the patent improves reliability through comprehensive monitoring and protection while avoiding the need for additional dedicated protection components, thus limiting the increase in system complexity.
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 effectively limits voltage across circuit components, preventing damage and ensuring safe operation by dynamically managing the resonant circuit's state during charging, thereby protecting the system from overvoltage conditions.
Implementation Method 1
the receiving circuit will resonant based on a tuned resonant frequency
Implementation Method 2
energy is transferred from the transmitting circuit, which also has a coil via induction
Implementation Method 3
a first switching device...connected between the first end and the second end of the inductor...in which the first end and the second end of the inductor are electrically coupled to each other through the first switching device
Data Source
AI summary
A wireless power transfer overvoltage protection system is provided. The system includes a resonant receiving circuit. The resonant receiving circuit includes an inductor, a resonant capacitor and a first switching device. The first switching device is connected the ends of the inductor. The first switching device has a first state in which the ends of the inductor are electrically coupled to each other through the first switching device, and a second state in which the inductor and resonant capacitor are capable of resonating. The system further includes a control module configured to control the first switching device to switching between the first state and the second state when the resonant receiving circuit is charging a load and a preset condition is satisfied and otherwise, the first switching device is maintained in the first state.