Linear Charging Circuit for Portable Devices
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Solution Overview
Problem
Existing charging apparatuses for portable devices have complex circuit designs, high power loss, and are prone to electromagnetic interference (EMI), with frequent switching and the use of inductors leading to inefficiencies and potential damage from over-current or over-voltage.
Innovation Solution
A charging apparatus featuring a sensing circuit, control unit, and linear charging circuit that detects power adapter voltage and battery capacity to switch between fast and slow charging modes, with a protection circuit to prevent over-current and over-voltage, and a simple circuit design to minimize power loss and EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If switching-mode charging circuit with inductor is used, then charging speed can be increased, but power loss increases and circuit complexity increases
Solution Approach 1:
The patent changes the fundamental operating parameter of the charging circuit from switching-mode to linear-mode operation. This parameter change eliminates the need for high-frequency switching and inductors, thereby reducing power loss associated with switching transitions and magnetic core losses, while maintaining controlled charging speed through linear voltage regulation.
Solution Approach 2:
The patent extracts and removes the inductor component from the charging circuit topology. By eliminating the inductor, the circuit avoids the complexities associated with magnetic component design, saturation issues, and switching losses, while still achieving effective charging through a simplified linear regulation approach.
2Productivity
If switching-mode charging circuit with inductor is used, then charging speed can be increased, but circuit complexity increases
Solution Approach 1:
The patent extracts and removes the inductor component from the charging circuit topology. By eliminating the inductor, the circuit avoids the complexities associated with magnetic component design, saturation issues, and switching losses, while still achieving effective charging through a simplified linear regulation approach.
Solution Approach 2:
The patent substitutes the mechanical/electromagnetic switching mechanism with an electronic linear regulation mechanism. This replacement eliminates the need for high-frequency switching components and their associated control circuitry, resulting in a simpler overall system architecture.
3Area of stationary object
If first switch and second switch are located closely in circuit design, then space is saved, but electromagnetic interference problems occur
Solution Approach 1:
The patent removes the switching components that generate electromagnetic interference from the circuit. Without high-frequency switching operations, there are no radiating electromagnetic fields to cause interference, eliminating the need for spatial separation or shielding measures.
4Loss of energy
If switching-mode charging circuit is used, then charging efficiency can be improved, but susceptibility to over-current or over-voltage damage increases
Solution Approach 1:
The patent changes the operating parameter from high-frequency switching to linear voltage regulation. This parameter change inherently provides better protection against over-current and over-voltage conditions, as the linear regulator naturally limits current and maintains stable output voltage without the risk of switching transients or inductor-related failures.
Data Source
AI summary
The present invention relates to a charging apparatus of portable device, which charges a battery module of the portable devices. The charging apparatus includes a sensing circuit, a control unit, and a linear charging circuit. The sensing circuit detects the voltage of a power adapter when the power adapter is plug to the portable devices, and then produces a sensing signal and transmits it to the control unit. The control unit produces a control signal according to the sensing signal and the remaining capacity of the battery module. The present invention features that the linear charging circuit receives an output power of the sensing circuit and charges the battery module according the control signal.