Wireless Charging Terminal Voltage Conversion for High Power
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Solution Overview
Problem
Existing wireless charging technologies face limitations in increasing charging power due to the constraints of the receiving coil and power management chip, where increasing current leads to coil heating and voltage limitations restrict power enhancement.
Innovation Solution
The terminal determines the requested voltage and current based on the power management chip's voltage threshold and the wireless charger's output capabilities, performing voltage and current conversion to ensure the charging signal meets the chip's requirements, allowing for high-power quick charging while avoiding coil overheating and voltage limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the current of the wireless charging signal is increased to increase charging power, then the charging power is improved, but the receiving coil is seriously heated due to direct current impedance and alternating current impedance
Solution Approach 1:
The patent changes the voltage parameter of the charging signal while maintaining current within safe limits. By increasing voltage instead of current, the charging power is improved without causing excessive coil heating, thus resolving the contradiction between power increase and temperature control
Solution Approach 2:
The patent dynamically adjusts the voltage and current parameters of the charging signal based on real-time conditions. The power management chip continuously monitors and regulates the charging parameters, allowing the system to operate at optimal power levels while preventing coil overheating
2Power
If the voltage of the charging signal is increased to increase charging power, then the charging power is improved, but the power management chip cannot handle voltages above its input voltage threshold
Solution Approach 1:
The patent introduces a power management chip as an intermediary between the wireless charging receiver and the battery. This chip converts the high-voltage charging signal into a lower voltage that it can safely process, while still delivering high power to the battery. The chip acts as a mediator that enables high-power charging without exceeding its voltage handling capabilities
Solution Approach 2:
The power management chip dynamically changes voltage and current parameters to maintain safe operating conditions. It converts the incoming high-voltage signal into appropriate voltage levels for battery charging, enabling high-power transmission while protecting the chip from voltage exceedance
3Power
If the current is continuously increased to increase power, then the charging power is improved, but the effect is limited due to coil heating and impedance constraints
Solution Approach 1:
The patent changes from current-based power increase to voltage-based power increase. By adjusting voltage rather than current, the system achieves higher charging power without the diminishing returns and efficiency losses associated with continuous current increases, thus resolving the contradiction between power improvement and charging efficiency
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 approach enables high-power quick charging by optimizing the charging signal to meet both the power management chip's limits and the wireless charger's capabilities, improving efficiency and reducing charging time.
Implementation Method 1
a charged terminal, as a wireless charging receiver, converts a wireless signal sent from a wireless charging transmitter into a corresponding charging signal
Implementation Method 2
due to existence of direct current impedance and alternating current impedance of a receiving coil of the terminal, the coil may be seriously heated when the current exceeds a certain threshold
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The present disclosure relates to a method and terminal for wireless charging. The method includes that: a terminal acquires a voltage threshold supported by a power management chip, and multiple output voltages supported by a wireless charger and output current upper limit values, each corresponding to a respective one of the output voltages; the terminal determines a voltage conversion coefficient according to the multiple output voltages and the voltage threshold, and sends a charging request to the wireless charger, where the charging request includes a requested voltage and a requested current, the requested voltage is a maximum output voltage among the output voltages which are not higher than a product of the voltage threshold and a reciprocal of the voltage conversion coefficient, and the requested current is not higher than the output current upper limit value corresponding to the requested voltage; and the terminal generates a charging signal under excitation of a wireless signal output from the wireless charger, and performs, according to the voltage conversion coefficient and a current conversion coefficient, voltage and current conversion on the charging signal to obtain an input signal of the power management chip, where the current conversion coefficient is the reciprocal of the voltage conversion coefficient. According to the solution provided by the present disclosure, charging efficiency may be effectively improved, and charging time may be reduced.