Wireless Charging Circuit With Multi-Stage Boosting for Reverse Charging
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Solution Overview
Problem
Current wireless charging technologies for electronic devices suffer from low charging power during reverse charging, resulting in slow charging speeds and high charging losses, which negatively impact user experience.
Innovation Solution
A wireless charging circuit integrated into a chip, featuring a first voltage conversion circuit, a second voltage conversion circuit with a boost circuit and switched-capacitor direct current converters, and an alternating current/direct current conversion circuit, which boosts the battery voltage efficiently to enhance charging power and reduce heat generation and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a wireless charging circuit uses a conventional boost circuit with large voltage difference between input and output, then the charging power can be increased, but the voltage conversion efficiency decreases and heat generation increases
Solution Approach 1:
The voltage conversion process is divided into multiple stages: a first boost circuit performs initial voltage boosting, followed by a switched-capacitor DC-DC converter that performs additional voltage multiplication. This segmentation allows each stage to operate at more favorable voltage differences, improving overall conversion efficiency while achieving the required high output voltage for high-power wireless charging.
Solution Approach 2:
The switched-capacitor DC-DC converter acts as an intermediary stage between the first boost circuit and the wireless charging output. It receives voltage from the first boost circuit, performs additional voltage multiplication through capacitor switching, and delivers the final high voltage. This intermediary structure enables efficient voltage transformation in steps rather than a single large jump.
2Power
If a wireless charging circuit uses a conventional boost circuit, then voltage can be boosted, but the inductor generates significant heat and electromagnetic interference
Solution Approach 1:
The switched-capacitor DC-DC converter stage is introduced to take over part of the voltage boosting function from the conventional inductor-based boost circuit. By extracting some of the voltage multiplication task and performing it through capacitor switching rather than inductor operation, the patent reduces the burden on the inductor, thereby reducing heat generation and electromagnetic interference from the inductor while maintaining the required voltage boosting capability.
3Adaptability or versatility
If wireless reverse charging is performed at low power (5W-10W), then the electronic device can charge other devices, but the charging speed is slow and charging loss is large
Solution Approach 1:
The patent changes the voltage and power parameters of the wireless charging circuit by implementing a multi-stage voltage conversion system. The first boost circuit and switched-capacitor DC-DC converter work together to enable the circuit to output higher voltages and powers (beyond the conventional 5W-10W range). This parameter change allows for faster charging speeds and reduced charging losses while maintaining reverse charging capability.
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 significantly increases the charging power and speed during reverse charging, improves voltage conversion efficiency, and reduces heat generation and electromagnetic interference, leading to a better user experience with enhanced power density and reduced losses.
Implementation Method 1
The second voltage conversion circuit includes a first boost circuit and at least one stage of switched-capacitor direct current converter that are connected in series
Implementation Method 2
The switched-capacitor direct current converter mainly includes multiple switching transistors and capacitors. The switched-capacitor direct current converter has no inductor disposed inside, and is a non-inductive DC-DC voltage converter. Therefore, the capacitor may be charged and discharged by controlling an on/off state of the switching transistor in the switched-capacitor direct current converter, to boost the input voltage and achieve a relatively high voltage conversion efficiency.
Implementation Method 3
The first alternating current/direct current conversion circuit is electrically connected to the second voltage conversion circuit, and the first alternating current/direct current conversion circuit is configured to convert a direct current voltage output by the second voltage conversion circuit into an alternating current voltage.
Data Source
AI summary
This application provides a wireless charging circuit and system, an electronic device, and a control method, and relates to the field of wireless charging technologies, to alleviate a problem of small charging power of an electronic device having a wireless reverse charging function. In the wireless charging circuit, a first voltage conversion circuit converts a supply voltage into a first battery voltage of a first battery, to charge the first battery. The first voltage conversion circuit further outputs the first battery voltage provided by the first battery. A second voltage conversion circuit boosts the first battery voltage. The second voltage conversion circuit includes a first boost circuit and at least one stage of switched-capacitor direct current converter that are connected in series. A first alternating current/direct current conversion circuit converts a direct current voltage output by the second voltage conversion circuit into an alternating current voltage.