Secondary Battery Control Circuit With Ferroelectric Voltage Retention
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Solution Overview
Problem
Secondary batteries face increased self-discharge at high temperatures, leading to the need for multiple voltage settings for upper and lower limit voltages, which increases power consumption due to the requirement for multiple comparators and constant voltage generation circuits.
Innovation Solution
A control circuit for secondary batteries incorporating a first and second voltage generation circuit, along with a voltage retention circuit, utilizing transistors and capacitors, including a ferroelectric layer, to set voltage differences based on transistor threshold voltages, reducing the need for multiple comparators and constant voltage generation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple voltage settings are implemented to compensate for temperature-dependent self-discharge, then charge and discharge management accuracy is improved, but power consumption increases due to multiple comparators and constant voltage generation circuits
Solution Approach 1:
The patent merges the functions of multiple constant voltage generation circuits and multiple comparators into a single comparator by generating multiple reference voltages within one circuit. This integration eliminates redundant components while maintaining the capability to detect multiple voltage thresholds for different temperature conditions.
Solution Approach 2:
The constant voltage generation circuit is designed to generate multiple reference voltages (first reference voltage and second reference voltage) that can be used for different temperature conditions. This multi-functional circuit replaces what would traditionally require separate circuits for each voltage level.
2Measurement precision
If multiple comparators are used to compare multiple reference voltages with battery voltage, then charge and discharge control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple comparison functions into a single comparator by providing it with multiple reference voltage inputs. This merging approach maintains the ability to perform multiple voltage comparisons while significantly reducing circuit complexity and component count.
Solution Approach 2:
The single comparator is designed to handle multiple reference voltages, making it a universal comparison device that can detect both the first reference voltage and the second reference voltage. This multi-functional design eliminates the need for separate comparators for each voltage threshold.
3Adaptability or versatility
If separate constant voltage generation circuits are provided for each reference voltage, then voltage setting flexibility is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent merges multiple constant voltage generation functions into a single integrated circuit that can generate multiple reference voltages. This unified approach maintains voltage setting flexibility for different temperature conditions while reducing the overall circuit configuration complexity and manufacturing cost.
Solution Approach 2:
The constant voltage generation circuit is designed as a universal device capable of generating multiple reference voltages (first reference voltage and second reference voltage) for different operating conditions. This multi-functional design provides adaptability without requiring separate circuits for each voltage level.
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 configuration reduces power consumption by allowing for efficient voltage retention and switching between upper and lower limit voltages, optimizing charge and discharge operations while minimizing power usage.
Implementation Method 1
a voltage retention circuit having a function of retaining a voltage of the back gate
Data Source
AI summary
A control circuit of a secondary battery with a novel structure is provided. The control circuit of a secondary battery includes a first transistor, a first voltage generation circuit generating a first voltage, and a second voltage generation circuit generating a second voltage. The first voltage generation circuit includes a second transistor and a first capacitor. The second voltage generation circuit includes a third transistor and a second capacitor. The difference between the first voltage and the second voltage is set in accordance with the threshold voltage of the first transistor. When the first transistor includes a back gate, a voltage retention circuit having a function of retaining the voltage of the back gate is included. The voltage retention circuit includes a fourth transistor and a third capacitor. The third capacitor includes a ferroelectric layer between a pair of electrodes. The third capacitor retains a voltage applied to the back gate by being applied with a voltage for polarization inversion in the ferroelectric layer.