Wireless Charging Device Sleep Mode Wake-Up Control
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Solution Overview
Problem
Wireless charging devices consume significant standby power due to the need to periodically apply current to detection coils to determine if a receiving device is present, which lowers overall system efficiency.
Innovation Solution
A wireless charging device that includes a sensor unit to detect external inputs, generating a wake-up signal to transition from sleep mode to active mode, and a detection unit using a detection coil to apply reference and higher currents to detect impedance changes, allowing power supply only when a mobile terminal is detected, thereby reducing standby power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting device periodically applies current to the detection coil to determine whether a receiving device exists, then the device can detect the presence of a mobile terminal, but standby power consumption significantly increases
Solution Approach 1:
The patent divides the operation into two distinct modes: sleep mode with minimal power consumption and active mode with full detection and charging capabilities. The system segments the detection function by using a separate sensor unit that operates in sleep mode to detect external inputs, while the main detection coil and charging circuitry remain inactive until activated by the sensor unit.
Solution Approach 2:
The sensor unit performs preliminary detection of external inputs (such as placing a mobile terminal on the charging surface) while the system is in sleep mode. This preliminary action triggers the activation of the main detection coil and charging circuitry only when needed, avoiding continuous operation and reducing standby power consumption.
2Speed
If the wireless charging device remains in active mode continuously to ensure immediate charging capability, then charging responsiveness is improved, but power consumption increases
Solution Approach 1:
The system implements periodic sensing through the sensor unit that continuously monitors for external inputs even in sleep mode. When an input is detected, the system transitions to active mode for immediate charging. This periodic monitoring approach maintains charging responsiveness while minimizing overall power consumption compared to continuous active operation.
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 reduces standby power usage by activating the wireless charging device only when an external input is sensed, optimizing power consumption and system efficiency.
Implementation Method 1
The sensor unit may include a piezoelectric sensor module sensing pressure applied by the mobile terminal to generate the wake-up signal
Implementation Method 2
The sensor unit may include a magnetic sensor module sensing magnetic force generated by the mobile terminal to generate the wake-up signal
Implementation Method 3
The sensor unit may include a touch sensor module sensing a touch input from the mobile terminal to generate the wake-up signal
Implementation Method 4
The detection unit may include a detection coil detecting the mobile terminal. The detection unit may apply a reference current to the detection coil to thereby detect a change in impedance
Implementation Method 5
The power may be supplied to the mobile terminal in a magnetic induction manner
Implementation Method 6
The power may be supplied to the mobile terminal in a magnetic resonance manner
Data Source
AI summary
A wireless charging device may include: a sensor unit sensing an input from an external device and generating a wake-up signal; a control unit, upon receiving the wake-up signal, exiting from a sleep mode to enter an active mode, and generating an activation signal; a detection unit receiving the activation signal from the control unit to detect a mobile terminal; and a power supply unit, in the case that the detection unit detects the mobile terminal, supplying power to the mobile terminal wirelessly.