Multi-Battery Charging Device With Field-Effect Transistors
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Solution Overview
Problem
The increasing power consumption of mobile terminals due to larger displays and faster processing rates leads to shorter battery life and longer charging times, causing current backflow between batteries when connected in parallel, which reduces battery life and charging efficiency.
Innovation Solution
A multi-battery charging and discharging device with field-effect transistors and a PMIC module separates battery connections during charging and discharging, using unidirectional conductive transistors to prevent current backflow by controlling the connection paths between batteries and loads, ensuring efficient charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are connected in parallel to increase power supply capacity, then the power supply capability is improved, but current backflow occurs between batteries causing reduced battery life and charging efficiency
Solution Approach 1:
The patent introduces field-effect transistors as intermediary components between batteries and the load/charging circuit. These transistors act as controllable switches that prevent direct parallel connection of batteries, thereby eliminating current backflow while maintaining the ability to supply combined power from multiple batteries through controlled sequential or selective activation.
Solution Approach 2:
The patent implements dynamic control of battery connections through field-effect transistors that can switch connection states based on charging/discharging requirements. The system dynamically selects which batteries are active and which are in standby, adapting the power supply configuration in real-time to prevent harmful current backflow while maximizing power output when needed.
2Loss of time
If multiple batteries are connected in parallel to reduce charging time, then the charging speed is improved, but current backflow between batteries reduces charging efficiency
Solution Approach 1:
Field-effect transistors are positioned as intermediary components in the charging circuit path between batteries and the charging module. These transistors control current flow direction and prevent backflow during charging operations, ensuring that charging current flows only in the intended direction from the charging module to individual batteries, thereby maintaining high charging efficiency.
Solution Approach 2:
The system dynamically controls the switching states of field-effect transistors during charging operations, enabling selective connection of batteries to the charging module. This dynamic control allows the system to optimize charging current distribution and prevent energy-wasting backflow, thereby reducing overall charging time while maintaining efficiency.
3Reliability
If field-effect transistors are added to control battery connections, then current backflow is prevented, but device complexity increases
Solution Approach 1:
The field-effect transistors in the patent serve multiple functions simultaneously: they act as switches to control battery connections, prevent current backflow during both charging and discharging, and enable dynamic battery selection. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity despite the added reliability benefits.
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 prolongs battery life, reduces charging time, and enhances user experience by preventing current backflow and optimizing power supply in mobile terminals.
Implementation Method 1
Each of the first field-effect transistors is provided in a connection path between a rechargeable battery and a load. The first field-effect transistor is used to control the connection path between the rechargeable battery and the load to be turned on or turned off.
Implementation Method 2
Each rechargeable battery is connected to a pulse width modulation (PWM) power module in the PMIC module through a field-effect switching transistor
Data Source
AI summary
A multi-battery charging and discharging device including a power management integrated circuit (PMIC) module, at least two rechargeable batteries, and a plurality of first field-effect transistors. Each rechargeable battery is connected to a pulse width modulation (PWM) power module of the PMIC module through a field-effect switching transistor, terminals for connecting field-effect switching transistors and the PWM power module are separated from each other. Each of the first field-effect transistors is provided in a connection path between each rechargeable battery and a load. The first field-effect transistor is used to control the connection path between the rechargeable battery and the load to be turned on or turned off.