Wearable Wireless Charging Circuit With Dual Charging Paths
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Solution Overview
Problem
Existing wireless charging technologies for wearable devices face inefficiencies in power transfer and charging modes, leading to suboptimal charging performance due to variations in input voltage and battery state, without effectively adapting to different usage states like sleep or active modes.
Innovation Solution
A wireless charging circuit for wearable devices that includes a wireless receiver, a charge pump circuit, and a step-down converter circuit, controlled by a controller to select the appropriate charging path based on voltage differences and battery state, utilizing electromagnetic induction for power transfer and adjusting coil voltage to optimize charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single charging path is used for wireless charging, then the circuit structure is simple, but the charging efficiency is suboptimal due to inability to adapt to different input voltages and battery states
Solution Approach 1:
The charging circuit is segmented into multiple independent charging paths: a first charging path using a charge pump circuit for voltage multiplication, and a second charging path using a step-down converter circuit for voltage regulation. The controller selectively activates one path based on the voltage difference between input voltage and battery voltage, enabling efficient charging across different voltage conditions without requiring a single complex adaptive circuit.
2Loss of energy
If the input voltage is much higher than the battery charging voltage, then power transfer can be initiated, but power loss increases and charging efficiency decreases
Solution Approach 1:
The system changes the voltage transformation parameter dynamically by selecting different charging paths. When the voltage difference exceeds a threshold (indicating high power loss risk), the controller activates the charge pump circuit to multiply the input voltage in stages, reducing the voltage differential and associated power losses. When the voltage difference is within acceptable range, the step-down converter circuit is used for direct efficient regulation, optimizing charging efficiency under varying voltage conditions.
3Ease of operation
If wireless charging is implemented in wearable devices, then beauty and comfort are improved, but charging performance becomes suboptimal due to space constraints and power limitations
Solution Approach 1:
The charging system implements dynamic adaptation by continuously monitoring the voltage difference between the wireless charging input and battery charging voltage, then dynamically selecting the appropriate charging path. The controller adjusts the charging configuration in real-time based on operating conditions, enabling the system to maintain optimal charging performance despite the power and space constraints inherent in wearable device wireless charging implementations.
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 reduces power loss and improves charging efficiency by dynamically selecting the charging path and adjusting coil voltage, ensuring efficient charging across varying input voltages and usage states, thereby enhancing the overall charging experience for wearable devices.
Implementation Method 1
a wireless receiver, configured to receive a charging power transmitted by a wireless transmitter of a wireless charging apparatus through electromagnetic induction
Data Source
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AI summary
A circuit of wireless charging, a method of charging a battery, and a wearable device. The circuit includes: a wireless receiver (10); a charge pump circuit (12) connected to a voltage output end of the wireless receiver (10), configured to receive an input voltage from the voltage output end that is boosted, and step down the input voltage to an output voltage of the charge pump circuit (12) to charge a battery; a step-down converter circuit (13) configured to perform the step-down charging on the battery in response to determining that a charging mode is in a constant voltage mode; a controller (14) configured to select one between the charge pump circuit (12) and the step-down converter circuit (13) as a charging path to charge the battery based on a voltage difference between the input voltage from the voltage output end of the wireless receiver (10) and a charging voltage of the battery.