Capacitor Charging via Secondary Battery Buffering
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Solution Overview
Problem
Conventional charging systems for portable terminals face limitations when using limited power sources, such as personal computers, as these sources can restrict power supply due to current limitations and sleep modes, affecting the ability to fully utilize rapid charging capacitors like electric double-layer capacitors.
Innovation Solution
A charging system that includes a charger-side energy storage device and a control unit to manage power supply from both the external power source and the internal storage device, allowing for stable charging of capacitors in portable terminals, even with limited power sources, and enabling continuous charging without external power connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a capacitor is used as a storage device for rapid charging, then charging time is reduced and recharging speed is improved, but power supply stability deteriorates when using limited power sources such as personal computers
Solution Approach 1:
The charging device performs preliminary charging of its own secondary battery using an external power source before charging the portable terminal. This preliminary action stores energy in advance, ensuring that when the terminal is placed on the charging device, power can be supplied immediately at high current without being limited by the external power source's current capacity or sleep mode restrictions.
Solution Approach 2:
The charging device's secondary battery acts as an intermediary between the external power source and the portable terminal's capacitor. It buffers the power supply, receiving power from the external source when available and delivering stable, high-current power to the terminal when needed, thus isolating the terminal from the limitations of the external power source.
2Loss of time
If power is supplied directly from a limited power source to charge a capacitor, then charging time is reduced, but power supply is interrupted when the external power source enters sleep mode or applies current limitation
Solution Approach 1:
The charging device charges its secondary battery in advance when the portable terminal is not being charged, storing energy during periods when the external power source is available and active. This preliminary energy storage ensures that when the terminal needs charging, power can be supplied continuously without interruption, even if the external power source enters sleep mode or applies current limits.
Solution Approach 2:
The system maintains continuous power supply capability by having the charging device's secondary battery ready to deliver power at any moment. The battery ensures uninterrupted charging of the terminal's capacitor, eliminating gaps that would occur if power depended directly on the external source's continuous availability and current capacity.
3Quantity of substance
If a rechargeable battery is used in the portable terminal, then power capacity is increased, but charging time is extended compared to using a capacitor
Solution Approach 1:
The system merges the advantages of both capacitors and rechargeable batteries by using the charging device's secondary battery (rechargeable battery type) to supply power for charging the terminal's capacitor. This combination allows the terminal to benefit from the capacitor's rapid charging capability while the power source provides the sustained energy capacity of a rechargeable battery, achieving both fast charging and adequate power capacity.
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 configuration ensures stable and efficient charging of capacitors in portable terminals, reducing reliance on external power capacity and allowing for uninterrupted operation, including during power source fluctuations and sleep modes, thereby enhancing charging reliability and flexibility.
Implementation Method 1
a secondary battery 82, and a power supply control unit 81 that performs: control of charging of the portable terminal 10 using power from the secondary battery 82; and control of charging of the secondary battery 82 using power from the external power source
Implementation Method 2
a portable terminal 10 that includes a capacitor 52 as a terminal-side power storage device
Data Source
AI summary
A charging system that performs power supply suitable for charging a capacitor of a portable terminal without being limited by the power supply capability of an external power source. The charging system includes a charging device that charges the portable terminal with power from an external power source such as a personal computer. This charging device includes a secondary battery and a power transmission coil. The charging device also includes a power supply control unit that performs: control of charging of the secondary battery with power from an external power source; and control of charging of the capacitor of the portable terminal via the power transmission coil with power from the secondary battery.