External Charging Accessory for Mobile Devices
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Solution Overview
Problem
Conventional mobile phone charging systems face limitations in providing sufficient charging current and voltage for quick charging due to heat dissipation and internal space constraints, leading to inefficiencies and voltage drops in the charging process.
Innovation Solution
A mobile electronic system with a charging accessory that includes a rectifier and an external charging circuit, which converts alternating-current voltage to direct-current voltage and adjusts the charging voltage based on the battery's instantaneous voltage, providing a larger charging current and minimizing resistance for efficient charging, while also including a backup battery for power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging current is increased to achieve quick charging, then the charging speed is improved, but the heat dissipation capability and internal space constraints are exceeded
Solution Approach 1:
The charging system is divided into two separate components: an external charging accessory containing the power supply and voltage regulation circuitry, and the mobile phone containing only the battery and connector. This segmentation allows the high-power charging functions to be located in the external accessory where heat dissipation is not constrained by the phone's internal space, thereby enabling quick charging without exceeding thermal limits.
2Productivity
If the charging current is increased to achieve quick charging, then the charging speed is improved, but the internal space of the mobile phone is exceeded
Solution Approach 1:
The charging accessory extracts and relocates the power supply unit and voltage regulation circuit from the mobile phone's internal structure to an external device. This extraction eliminates the need for large internal space allocation for power management components, allowing the mobile phone to maintain a compact form factor while still supporting high-speed charging through the external accessory.
3Reliability
If the resistance from USB cable to battery is reduced to enable quick charging, then the voltage drop is reduced, but the total resistance (cable + charging circuit) still exceeds the tolerable upper limit
Solution Approach 1:
The external charging accessory acts as an intermediary device between the power source and the mobile phone battery. It incorporates high-power switching elements and optimized circuitry that can deliver high current with minimal voltage drop, effectively mediating the power transfer and overcoming the limitations of standard USB cable resistance and internal charging circuit resistance.
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 enables faster and more efficient charging by supplying a larger charging current and voltage, reducing resistance and heat dissipation issues, and providing a backup power source for mobile devices, thus meeting user demands for quick charging without the need for domestic AC power or USB connections.
Implementation Method 1
the rectifier converts the alternating-current voltage into a first direct-current voltage
Data Source
AI summary
A mobile electronic system including a mobile electronic device and a charging accessory is provided. The mobile electronic device includes a first connector and a battery. The charging accessory includes a second connector. The first connector and the second connector are configured to couple the mobile electronic device and the charging accessory. When the charging accessory is coupled to an alternating-current voltage and the mobile electronic device, the charging accessory converts the alternating-current voltage into a direct-current voltage, detects an instantaneous voltage of the battery, determines the value of the direct-current voltage according to the instantaneous voltage, and outputs the direct-current voltage to charge the battery.