Battery Pack Voltage Converter for Leakage Current Reduction
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Solution Overview
Problem
Conventional battery packs with multiple cells connected in series face challenges in generating sufficient power for devices like laptop computers, often requiring expensive high-voltage regulators and experiencing leakage current issues, especially when battery cell voltage is low.
Innovation Solution
A battery pack design incorporating a voltage converter with diodes and transistors that gradually drops the battery cell voltage to a predetermined level, supplying power to the charge/discharge controller while limiting leakage current by turning off the transistor when the voltage is low, thereby reducing costs and preventing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high-voltage regulator is used to generate power for the battery management system, then the power generation capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces expensive high-voltage regulators with a voltage divider circuit composed of simple resistors and diodes. These passive components are much cheaper and can be easily replaced if needed, directly addressing the cost issue while maintaining power generation functionality for the battery management system.
Solution Approach 2:
The patent changes the voltage parameter through a voltage divider configuration using resistors and diodes, transforming the high battery voltage into a suitable lower voltage for the battery management system without requiring expensive high-voltage regulation components.
2Stability of the object's composition
If the voltage converter operates continuously to supply power, then the power supply stability is improved, but the leakage current increases when battery voltage is low
Solution Approach 1:
The patent introduces dynamic control by using a control circuit that monitors battery voltage and selectively activates or deactivates the voltage converter based on voltage levels. This dynamic operation allows the system to maintain stability when needed while preventing energy loss through leakage current when the battery voltage is low.
Solution Approach 2:
The patent implements a feedback mechanism where the control circuit continuously monitors the battery voltage and adjusts the operation of the voltage converter accordingly. When voltage drops below a threshold, the feedback signal turns off the converter, preventing further energy loss while maintaining system stability during normal operation.
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 design allows for efficient power generation and reduced leakage current, enabling the battery pack to operate within a predetermined withstand voltage range at lower costs and ensuring reliable charging and discharging of battery cells.
Implementation Method 1
a voltage converter electrically connected in parallel to the charge/discharge switch, configured to drop a voltage of the battery cell unit and to output the dropped voltage as power of the charge/discharge controller
Implementation Method 2
a first diode connected between the battery cell unit and the charge/discharge switch and outputting a voltage of the battery cell unit to a first node, and a second diode connected between the charge/discharge switch and the charge/discharge terminals and outputting the voltage of the battery cell unit to the first node
Implementation Method 3
The first voltage converter may include a first Zener diode configured to drop a voltage of the battery cell unit to the first converted voltage
Implementation Method 4
a first field effect transistor connected in parallel to the first Zener diode and configured to output the first converted voltage
Implementation Method 5
a third Zener diode connected in parallel to the first field effect transistor and configured to protect the first field effect transistor
Implementation Method 6
The second voltage converter may include a second Zener diode that is configured to drop the first converted voltage to the second converted voltage
Implementation Method 7
a second field effect transistor connected in parallel to the second Zener diode and configured to output the second converted voltage
Implementation Method 8
a fourth Zener diode connected in parallel to the second field effect transistor and configured to protect the second field effect transistor
Data Source
AI summary
A battery pack and a power generation circuit in the battery pack are disclosed. The battery pack includes a battery cell unit including battery cells connected in series, a charge/discharge switch connected between the battery cell unit and charge/discharge terminals, a charge/discharge controller controlling the charge/discharge switch to charge or discharge the battery cell unit, and a voltage converter electrically connected in parallel to the charge/discharge switch and dropping a voltage of the battery cell unit, and outputting the dropped voltage as power of the charge/discharge controller.