Dual Charging ICs for Heat Dissipation in Mobile Terminals
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Solution Overview
Problem
Rapid charging technologies for mobile terminals face a bottleneck due to intense heat generation, primarily from conversion losses in charging circuits, as most charging chips have efficiencies of 80% to 90%, leading to significant energy being converted into heat, especially as charging current increases.
Innovation Solution
A rapid charging method and system that utilize a Type-C interface for communication between a mobile terminal and a charging accessory, employing two charging ICs and a load switch to manage charging current and temperature, with a temperature sensor to adjust currents and balance heat dissipation between the two circuits, ensuring efficient charging and reduced heat emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging current is increased to achieve rapid charging, then charging speed is improved, but heat generation increases
Solution Approach 1:
The patent divides the charging function into two separate charging ICs (first charging IC in charging accessory and second charging IC in mobile terminal) that operate in parallel. Each charging IC handles a portion of the total charging current, thereby segmenting the heat generation source and reducing the temperature increase at any single location while maintaining high overall charging speed.
2Power
If charging current is increased to achieve rapid charging, then charging power is improved, but energy loss increases
Solution Approach 1:
The charging process is segmented into two parallel paths through two separate charging ICs. Each charging IC operates at optimized current levels, reducing the conversion loss that would occur if a single IC handled the entire high current. The total charging power is the sum of both ICs' output, achieving high power with reduced individual energy loss.
3Device complexity
If single charging IC is used, then device complexity is reduced, but heat dissipation capability is insufficient
Solution Approach 1:
The charging system is segmented into two independent charging ICs with separate control circuits. The first charging IC is controlled by a microcontroller in the charging accessory, and the second charging IC is controlled by a controller in the mobile terminal. This segmentation enables distributed heat dissipation across two locations while maintaining relatively simple individual circuit designs.
Solution Approach 2:
A charging accessory is introduced as an intermediary device between the power source and the mobile terminal. This accessory contains the first charging IC and communicates with the mobile terminal's controller through a Type-C interface. The intermediary structure allows heat generation to be distributed to the accessory, reducing the thermal burden on the mobile terminal itself.
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 solution effectively increases charging current while dispersing heat across both charging circuits, thereby decreasing the overall temperature and improving heat dissipation efficiency, addressing the heat bottleneck in existing rapid charging technologies.
Implementation Method 1
A temperature sensor is disposed on the charging accessory, and a temperature of the mobile terminal is obtained through the Type-C interface
Implementation Method 2
efficiency of most charging chips is 80% to 90%, so that 10% to 20% of the energy is converted into heat
Data Source
AI summary
A rapid charging method and a system for a mobile terminal are provided, which are capable of increasing charging current and dissipating heat. The method includes communicating a controller of the mobile terminal with the charging accessory through a Type-C interface after the mobile terminal detects that the charger is connected to an electric power supply; turning on a load switch by the controller, so that the microcontroller controls a first charging integrated circuit (IC) to start charging, and the controller controls a second charging IC of the mobile terminal to start charging; and stopping charging of the second charging IC of the mobile terminal, and charging the first charging IC of the charging accessory until power of the battery is full when a charging current gradually decreases to a threshold.