Overcurrent and Overvoltage Protection Circuit for Wireless Power Supply
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Solution Overview
Problem
The existing wireless power supply systems for household appliances, such as electric pressure cookers, face challenges in protecting against overcurrent and overvoltage, which can lead to system instability and safety issues due to the lack of effective protection circuits.
Innovation Solution
An overcurrent and overvoltage protection circuit is introduced for electromagnetic induction type wireless power supply systems, comprising a current detecting unit, voltage detecting unit, and a main control unit that adjusts transmission power or stops resonance operations when detection values exceed preset limits, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power supply is implemented through alternating current inverter system, then wireless connection advantage is achieved, but overcurrent and overvoltage risks increase
Solution Approach 1:
The patent implements preliminary protection by detecting overcurrent and overvoltage conditions before they cause damage. The control unit continuously monitors current and voltage parameters during wireless power transmission, and preemptively adjusts or stops power transmission when threshold values are approached, preventing harmful effects before they occur.
Solution Approach 2:
The patent establishes a feedback mechanism where the control unit receives real-time information about current and voltage states from the wireless power supply system. Based on this feedback, the control unit dynamically adjusts the power transmission parameters or terminates transmission when overcurrent or overvoltage conditions are detected, creating a closed-loop control system that maintains safety.
2Reliability
If protection circuit is added to wireless power supply system, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control unit in the patent serves multiple functions: it controls the alternating current inverter for wireless power transmission, detects current and voltage parameters, determines whether overcurrent or overvoltage conditions exist, and adjusts or stops power transmission accordingly. By integrating these diverse functions into a single control unit, the patent avoids the need for separate dedicated protection circuits, thereby maintaining system reliability while minimizing the increase in device 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
The solution effectively prevents overvoltage and overcurrent conditions, enhancing the safety and reliability of wireless power supply systems in household appliances like electric pressure cookers by automatically adjusting power transmission or halting resonance when limits are exceeded.
Implementation Method 1
The wireless power supply end includes a resonant transmitting unit, a driving unit driving the resonant transmitting unit to perform a resonance operation
Implementation Method 2
a resonant transmitting unit, a driving unit driving the resonant transmitting unit to perform a resonance operation
Implementation Method 3
a current detecting unit, which is connected to the resonant transmitting unit, and outputs a current detection value by detecting a resonance current of the resonant transmitting unit
Implementation Method 4
a voltage detecting unit which is connected to the resonant transmitting unit, and outputs a voltage detection value by detecting a resonance voltage of the resonant transmitting unit
Data Source
AI summary
Provided are an overcurrent and overvoltage protection circuit, an electromagnetic induction type wireless power supply system and a cooking appliance. The overcurrent and overvoltage protection circuit includes a current detecting unit that outputs a current detection value by detecting a resonance current of a resonant transmitting unit a voltage detecting unit that outputs a voltage detection value by detecting a resonance voltage of the resonant transmitting unit and a main control unit including a current detecting end and a voltage detecting end, and the current detecting end is connected to an output end of the current detecting unit, the voltage detecting end is connected to an output end of the voltage detecting unit, and when the current detection value exceeds a preset current limit and/or the voltage detection value exceeds a preset voltage limit.