Switched Capacitor Charging Circuit for Battery Boost and Area Reduction
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Solution Overview
Problem
The utilization of switched capacitor circuits in charging/discharging circuits for silicon negative electrode batteries is limited, and additional low-voltage boost circuits are needed, increasing the circuit area and complexity.
Innovation Solution
A charging/discharging circuit utilizing a switched capacitor circuit that converts input power supply voltage into charging voltage and discharging voltage into load voltage, with additional direct current conversion and buck circuits to optimize energy utilization and reduce circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional charging/discharging circuit with separate low-voltage boost circuit is used for silicon negative electrode batteries, then the battery capacity and life are improved, but the circuit area and complexity increase
Solution Approach 1:
The switched capacitor circuit is designed to perform multiple functions: it can operate as a charging circuit when the battery voltage is low, and as a discharging/boost circuit when the battery voltage is high. This multi-functionality eliminates the need for separate dedicated charging and discharging circuits, thereby reducing overall circuit area while maintaining support for silicon negative electrode batteries with extended capacity and life
Solution Approach 2:
The circuit dynamically switches between charging mode and discharging mode based on the battery's state of charge and voltage level. The controller adjusts the operating mode in real-time, allowing the same hardware circuit to adapt to different battery conditions, thus avoiding the need for fixed separate circuits and reducing overall circuit complexity and area
2Use of energy by moving object
If additional low-voltage boost circuit is added to utilize energy in low-voltage region, then energy utilization is improved, but device complexity increases
Solution Approach 1:
The switched capacitor circuit serves dual purposes: during charging it accepts energy from external power supply, and during discharging it boosts low battery voltage to usable levels. This universal design allows the same circuit to handle both energy storage and energy recovery, maximizing energy utilization without adding separate boost circuitry
Solution Approach 2:
The patent merges the charging circuit functionality and the low-voltage boost circuit functionality into a single switched capacitor circuit. By combining these functions, the circuit achieves improved energy utilization across both charging and discharging phases while avoiding the complexity of multiple separate circuits
3Speed
If switched capacitor circuit is used only in fast charging scenario, then fast charging capability is achieved, but circuit utilization is low
Solution Approach 1:
The switched capacitor circuit dynamically adapts its function based on operational needs: it operates in fast-charging mode when high current is required, and switches to discharging/boost mode when the battery needs to supply power. This dynamic versatility ensures high circuit utilization across different operating scenarios while maintaining fast charging capability
Solution Approach 2:
The circuit is designed with universal functionality to handle both fast charging and discharging operations. By being able to operate in multiple modes (charging, discharging, boosting), the switched capacitor circuit achieves high utilization rates regardless of whether the device is charging or discharging, eliminating the underutilization problem of dedicated fast-charging-only circuits
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
Improves the utilization of switched capacitor circuits, reduces circuit area, and efficiently meets power supply requirements of loads by converting voltages for both charging and discharging processes.
Implementation Method 1
a switched capacitor (SC) circuit configured to charge/discharge a battery. The switched capacitor (SC) circuit includes: a first end configured to receive an input power supply voltage; a second end configured to: provide a charging voltage for the battery in a charging process, and receive a discharging voltage released by the battery in a discharging process
Data Source
AI summary
This application provides a charging/discharging circuit and an electronic device, and relates to the field of electronic technologies, to improve utilization of a switched capacitor circuit and reduce an area of the charging/discharging circuit. The charging/discharging circuit provided in this application includes a switched capacitor (SC) circuit, configured to charge/discharge a battery. The switched capacitor (SC) circuit includes a first end, configured to receive an input power supply voltage; a second end, configured to: provide a charging voltage for a battery in a charging process, and receive a discharging voltage released by the battery in a discharging process; and a third end, configured to provide an output voltage, where the output voltage is a direct current voltage or a pulse width modulation (PWM) voltage.