Wireless Charging Protection Circuit for Double-Voltage Startup
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Solution Overview
Problem
The double-voltage startup mode in wireless charging systems can cause the input voltage of the receiving terminal to be pulled up to a very high level when the terminal is quickly picked up or put down, risking damage to the terminal.
Innovation Solution
A self-adaptive protection circuit that includes clamping circuits, resistors, switching transistors, a Schmitt trigger, and a NOT gate, which detects the input voltage and sends a signal to the double-voltage logic control module to exit the double-voltage mode, thereby protecting the receiving terminal from over-high input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the receiving terminal is quickly picked up and put down during double-voltage startup, then the startup speed is improved, but the input voltage is pulled up to a very high level causing damage risk
Solution Approach 1:
The patent introduces a protection circuit as an intermediary between the double-voltage startup mechanism and the receiving terminal. This circuit includes voltage detection components that monitor the input voltage level and trigger a shutdown signal when over-voltage is detected, thereby mediating the harmful effect of rapid pickup on the terminal
Solution Approach 2:
The protection circuit implements a feedback mechanism by continuously detecting the input voltage level and automatically generating a shutdown signal when the voltage exceeds a safe threshold. This negative feedback loop prevents the voltage from reaching damaging levels during rapid pickup operations
2Reliability
If the double-voltage mode is used to ensure normal chip startup, then the startup reliability is improved, but the receiving terminal may be damaged due to high voltage
Solution Approach 1:
The patent employs dynamic voltage control by switching between different voltage modes based on real-time detection. The system dynamically adjusts the operating voltage level - using double-voltage mode when safe and switching to single-voltage mode when over-voltage risk is detected, thereby maintaining reliability while preventing damage
Solution Approach 2:
The protection circuit performs preliminary voltage detection before the double-voltage mode can cause damage. By monitoring the input voltage in advance and preparing the shutdown signal, the system prevents terminal damage before it occurs while still allowing reliable startup when conditions are favorable
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 protects the receiving terminal from high input voltage during double-voltage startup, automatically switching between modes based on input voltage levels, providing strong protection and fast response, especially during quick pick-up and put-down scenarios.
Implementation Method 1
the input voltage vrect of the receiving terminal of the wireless charging system is connected to a GND VSS through the clamping circuit 1, the clamping circuit 2, the clamping circuit 3
Implementation Method 2
a switching transistor NM1, a switching transistor NM2... the gate of the switching transistor NM1... the gate of the switching transistor NM2
Implementation Method 3
a Schmitt trigger... an output end of the Schmitt trigger is connected to the double-voltage logic control module
Data Source
AI summary
A self-adaptive protection circuit and method for double-voltage startup of a wireless charging system are provided. The method controls a double-voltage logic control module of a double-voltage starting circuit to send a signal for exiting a double-voltage mode by detecting an input voltage of a receiving terminal of the wireless charging system. By the input voltage of the receiving terminal of the wireless charging system, the double-voltage logic control module of the double-voltage starting circuit is controlled to send the signal for exiting the double-voltage mode, thus protecting the receiving terminal of the wireless charging system from the over-high input voltage in the double-voltage mode.