Resonant SCVD Charging Circuit for Multi-Input Power Compatibility
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Solution Overview
Problem
Conventional electronic devices using switched capacitor voltage divider (SCVD) circuits for direct charging face limitations in compatibility with various power devices, requiring additional components and space due to fixed voltage conversion ratios, and need multiple circuits for wired and wireless charging, increasing cost and reducing internal space.
Innovation Solution
The electronic device employs a plurality of resonant SCVDs with a flying capacitor of small capacity to configure a 3-level buck circuit, controlling switching based on inductor current or capacitor voltage to enhance power conversion efficiency, reduce electromagnetic interference (EMI), and automatically adjust switching frequency with load fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional SCVD circuit with fixed voltage conversion ratio is used, then the charging efficiency is improved (96% or more), but the compatibility with various power devices is limited
Solution Approach 1:
The patent applies dynamics by making the voltage conversion ratio adjustable rather than fixed. The SCVD circuit can dynamically change its conversion ratio to match different input voltages from various power adapters (5V, 9V, 12V, etc.), while maintaining high charging efficiency through optimized switching control strategies.
Solution Approach 2:
The patent changes the parameter of voltage conversion ratio from a fixed value to an adjustable parameter. By modifying the conversion ratio according to the input voltage level, the circuit achieves both high efficiency and broad compatibility with different power supply devices.
2Adaptability or versatility
If multiple SCVD circuits and switching chargers are installed to support both wired and wireless charging, then the compatibility is improved, but the space for mounting components is reduced
Solution Approach 1:
The patent implements universality by designing a single SCVD circuit that can handle both wired and wireless charging scenarios. The circuit is configured to work with various power input types through adjustable voltage conversion ratios, eliminating the need for separate dedicated circuits for different charging methods.
Solution Approach 2:
The patent merges multiple charging circuit functions into a single unified SCVD circuit. By combining the capabilities of handling different voltage inputs and charging modes into one circuit, the design reduces component count and frees up mounting space while maintaining full functionality.
3Adaptability or versatility
If multiple charging circuits are installed to support various power devices, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent uses a universal SCVD circuit design that performs multiple functions - handling different input voltages, supporting various charging modes, and adapting to different power devices - all within a single circuit architecture, thereby reducing overall system complexity.
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 solution allows the electronic device to efficiently handle various power supply devices, reducing heat generation and component count, while improving charging efficiency and system efficiency across different load conditions.
Implementation Method 1
a resonant frequency of the flying capacitor and the inductor may be the same as a switching frequency of the plurality of switches
Data Source
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AI summary
An electronic device is provided. The electronic device includes a battery and a power management module electrically connected to the battery and configured to manage a charging or a discharging of the battery. The power management module includes a first charging circuit configured to include a first switch group, a first capacitor, and a first inductor, a second charging circuit configured to include a second switch group, a second capacitor, and a second inductor, and a power path distributor configured to distribute power from a first external power supply device or a second external power supply device to the first charging circuit or the second charging circuit.