Resonant Charging Circuit for Multi-Adapter Battery Charging
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Solution Overview
Problem
Existing switched capacitor voltage divider (SCVD) circuits in electronic devices have a fixed voltage conversion ratio, limiting compatibility with various power devices and requiring additional switching chargers for legacy adapters, which increases device size and cost.
Innovation Solution
An electronic device with a resonant charging circuit that includes a power management module controlling a charging circuit with switches, capacitors, and inductors, allowing operation in a first mode with a fixed voltage conversion ratio for compatible power supplies and a second mode with adjustable conversion ratio for legacy adapters, using different switching frequencies and duty cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an SCVD circuit with fixed voltage conversion ratio is used, then power conversion efficiency is improved (96% or more), but 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 control circuit dynamically switches between different conversion ratios (first conversion ratio for direct charging, second conversion ratio for legacy adapters) based on the type of power supply device detected, allowing the SCVD circuit to adapt to different charging scenarios while maintaining high efficiency
Solution Approach 2:
The patent changes the voltage conversion ratio parameter based on the power supply device type. When a direct charging device is detected, the circuit operates at a first voltage conversion ratio optimized for high current charging. When a legacy adapter is detected, the circuit switches to a second voltage conversion ratio compatible with fixed voltage output, thus resolving the contradiction between efficiency and compatibility
2Adaptability or versatility
If a separate switching charger is installed for legacy adapters, then compatibility is improved, but device size and cost increase
Solution Approach 1:
The patent makes the single SCVD circuit universal by enabling it to handle both direct charging devices and legacy adapters through adjustable voltage conversion ratio. The control circuit detects the power supply type and automatically selects the appropriate conversion ratio, eliminating the need for separate switching chargers and reducing device complexity while maintaining compatibility
Solution Approach 2:
The patent segments the charging operation into different modes based on power supply type. The control circuit divides the operating conditions into direct charging mode (using first conversion ratio) and legacy adapter mode (using second conversion ratio), allowing a single circuit to efficiently handle multiple charging scenarios without requiring additional hardware
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 device supports multiple power supply types, enhances power conversion efficiency, reduces electromagnetic interference, and improves system efficiency by using a resonant SCVD circuit with a flying capacitor and inductor.
Implementation Method 1
the charging circuit has a fixed voltage conversion ratio due to a resonance of the capacitor and the inductor
Data Source
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AI summary
An electronic device is provided that includes a battery, a power management module, and a processor electrically connected to the power management module. The power management module includes a charging circuit including a plurality of switches, a capacitor, and an inductor. The power management module receives power from an external power supply device, identifies an electrical connection between the charging circuit and the external power supply device, operates in a first mode to charge the battery when a type of the external power supply device is a first type, and operates in a second mode to charge the battery when the type of the external power supply device is a second type.