Wireless Charging Frequency Control for Standby Restoration
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Solution Overview
Problem
Existing wireless charging systems require mechanical contact between the power transmission and reception units, which limits their application in scenarios where contact is not feasible.
Innovation Solution
A wireless charging control apparatus and method that uses magnetic field coupling, such as electromagnetic induction or magnetic resonance, to transmit power without mechanical contact, with a controlling device adjusting output voltage and frequency to ensure safe and efficient power transfer, allowing the system to restore itself from a standby to a start state based on demand signals and voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical contact is used between power transmission and reception units, then reliable power transfer can be achieved, but the system cannot be applied when contact is not feasible
Solution Approach 1:
The patent replaces the mechanical contact system with a wireless electromagnetic induction system. The power transmission unit uses a transmitter coil to generate a magnetic field, and the power reception unit uses a receiver coil to induce current from the magnetic field, eliminating the need for mechanical contact while maintaining power transfer functionality. This substitution enables application in scenarios where mechanical contact is not feasible.
2Speed
If high output voltage is transmitted to restore the power reception side quickly, then restoration speed improves, but excessive load may be applied to electrical components
Solution Approach 1:
The patent implements dynamic voltage control where the output voltage of the power transmission unit is adjusted based on the operational state of the power reception unit. During restoration phase, a first output voltage is applied to safely restore the reception unit from standby state. After successful restoration, a second output voltage is applied for normal charging operation. This dynamic adjustment prevents excessive load on components while achieving quick restoration.
Solution Approach 2:
The patent applies a preliminary low voltage (first output voltage) to restore the power reception unit before switching to full charging voltage. This preliminary action ensures that the reception unit's electrical components are properly initialized and protected before receiving full power, preventing damage from excessive load while enabling subsequent fast charging.
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
Enables wireless charging without mechanical contact, preventing excessive load on the power reception side and ensuring reliable restoration and charging of electrical loads like batteries, even when positional relations between units change.
Implementation Method 1
electric power is transmitted and received without a mechanical contact by magnetic field coupling such as, for example, electromagnetic induction and magnetic resonance
Implementation Method 2
electric power is transmitted and received without a mechanical contact by magnetic field coupling such as, for example, electromagnetic induction and magnetic resonance
Implementation Method 3
a power transmission circuit electrically connected to the power transmission unit and electrically connected to a high-frequency alternating current (AC) power supply
Data Source
AI summary
A wireless charging control apparatus is mounted on a power transmission side apparatus which is provided with: a power transmission unit (102); and a power transmission circuit (113, 114, 115) electrically connected to the power transmission unit and electrically connected to a high-frequency alternating current (AC) power supply (103). The wireless charging control apparatus is provided with: an obtaining device (111) configured to obtain a demand signal indicating a power transmission demand; a controlling device (111) configured to control the power transmission circuit such that electric power is transmitted at a first output voltage from the power transmission unit to a power reception unit (202) of a power reception side apparatus in such a condition that the demand signal is obtained; and a receiving device (112) configured to receive a restoration signal indicating that the power reception side apparatus in a standby state is restored to a start state.