Mobile Terminal Power Supply Switching Module
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Solution Overview
Problem
Conventional cell phone power supply systems, when charged with an external power source, continue to draw power from the battery, reducing its lifespan and not meeting compliance with Chinese Standards for Mobile TD Family Cell Phones, which require the battery to be charged without supplying power to the terminal.
Innovation Solution
A power supply unit for mobile terminals comprising a battery, power supply conversion module, charging management module, and power supply switching module, which switches between battery power and external power supply based on the presence of an external power source, using a field effect transistor and resistor voltage sampling circuit to control power distribution, ensuring the battery is only charged when an external power supply is connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery continues to supply power to the terminal while being charged by an external power supply, then the terminal can maintain power supply, but the battery service life is shortened and it does not comply with Chinese Standards
Solution Approach 1:
The patent implements dynamic power supply switching by detecting the connection state of external power supply and automatically adjusting the power supply path. When external power is detected, the system switches to external power supply mode and stops battery output; when external power is disconnected, it automatically switches back to battery power supply mode, ensuring continuous power while extending battery life through intelligent dynamic control
Solution Approach 2:
The system employs feedback control through power supply detection circuits that continuously monitor the connection state of external power supplies. Based on the detection results, the control module adjusts the power supply switching state in real-time, creating a closed-loop control system that ensures the battery only charges when external power is present and stops power output to the terminal, thereby extending battery service life while maintaining compliance
2Duration of action of moving object
If a power supply switching system is implemented to separate charging and power supply paths, then battery service life is extended and compliance is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the power supply detection, control logic, and switching functions into an integrated power management system. The detection module, control module, and switching elements work as a unified system where the control module coordinates both the power supply switching and charging control functions, reducing overall system complexity while achieving the dual goals of extending battery life and ensuring compliance with Chinese Standards
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 ensures that when an external power supply is connected, it powers the terminal, and the battery is charged without supplying power, meeting the Chinese Standards and suitable for 3G handsets, while also providing a system power supply module for radio frequency transmission power storage and discharge.
Implementation Method 1
power supply conversion module used for converting the voltage of an external power supply into power supply voltage required by the terminal
Implementation Method 2
power supply switching module comprises a second resistor, a third resistor and a field effect transistor
Implementation Method 3
second resistor and third resistor are connected in series to form a voltage sampling circuit
Data Source
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AI summary
A power supply unit for a mobile terminal and a power supply switching method for a mobile terminal. The power supply unit for a mobile terminal includes a battery (150), a power converting module (110), a charge management module (120), and a power switching module (130). Both the charge management module and the power converting module include a power input terminal for connecting an external power source (1). The charge management module is connected with the battery to charge the battery when the external power source is in connection. The power converting module is connected with the power switching module to convert an external power voltage into a power supply voltage needed by the mobile terminal and to control the on-off state of the power switching module. The power switching module is turned on and power is supplied to the mobile terminal from the battery when the external power source is not in connection. The power switching module is turned off and power is supplied to the mobile terminal from the power converting module and the battery is charged by the charge management module when the external power source is in connection. Thus, when the external power source is in connection, the external power source supplies power to the mobile terminal and the battery is charged without supplying power to the mobile terminal. It is adaptive to switch power of existing mobile phones and third generation (3G) mobile phones.