External Charging Circuit Isolates Heat in Mobile Devices
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Solution Overview
Problem
Current charging circuits in mobile devices generate significant heat loss during high-current charging, leading to discomfort and prolonged charging times, which are exacerbated by increased supply voltage and current, and existing cooling measures are inadequate in reducing heat loss effectively.
Innovation Solution
A charging system where the mobile device receives a high current from a separate charging device via a connector, with the charging circuit located in the charging device, using an analog switch to manage current flow and potentially a USB port for data exchange, thereby minimizing heat generation in the mobile device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional charging circuit is used in the mobile device, then the charging circuit can charge the battery, but the charging time is excessively long
Solution Approach 1:
The charging circuit is extracted from the mobile device and placed in an external charging device. The mobile device only retains the battery and connector, while the external charging device contains the charging circuit that converts USB power to battery charging voltage and current. This extraction enables fast charging without burdening the mobile device's internal circuitry.
2Productivity
If the supply voltage and supply current are increased to 20V/5A for fast charging, then the charging time is reduced, but the heat generation problem becomes more serious
Solution Approach 1:
The high-power charging circuit operating at 20V/5A is extracted from the mobile device and placed in the external charging device. This removes the heat-generating components from the mobile device, allowing fast charging without the mobile device bearing the thermal burden of high current conversion.
Solution Approach 2:
The external charging device acts as an intermediary between the USB power source and the mobile device battery. It performs the voltage and current conversion at the optimal location, delivering the required power while isolating the mobile device from heat-generating conversion processes.
3Temperature
If cooling measures such as graphite attaching or air cooling are used on the mobile device, then the heat loss is reduced, but the volume of the mobile device is increased
Solution Approach 1:
The charging circuit is extracted from the mobile device, eliminating the need for internal cooling measures. This removes the requirement for graphite sheets, heat sinks, or air cooling structures within the mobile device, thereby avoiding any increase in device volume while still addressing heat management.
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 reduces heat loss in mobile devices during high-current charging, adapts to increased voltage and current standards, and shortens charging times while maintaining user comfort by isolating the high-current charging circuit from the mobile device.
Implementation Method 1
a charging circuit on the side of the mobile device generates a heat loss of 7 W
Data Source
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AI summary
Embodiments of the present invention relate to a charging method, a mobile device, and a charging device. The mobile device includes a battery and a connector, where the connector includes a charging pin and a ground pin; and when the charging pin establishes a connection to an output pin of the charging device by using a charging cable or a battery charging stand, the charging pin receives a first current signal transmitted by the output pin of the charging device, and transmits the first current signal to an anode pin of the battery, so as to charge the battery.