Capacitor Device Temperature-Adaptive Full-Charge Voltage Control
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Solution Overview
Problem
Conventional capacitor devices for electric vehicles face performance degradation due to capacitance reduction and increased internal resistance at low temperatures, and overcharging at high temperatures, leading to inefficient energy storage and potential capacitor deterioration.
Innovation Solution
A capacitor device with a temperature-detecting system that adjusts the full-charge voltage by using a voltage-dividing circuit with variable resistors and semiconductor switching elements, reducing the full-charge voltage at high temperatures and increasing it at low temperatures to optimize storage performance and prevent deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitor is charged to a high full-charge voltage, then the storage performance improves at low temperatures, but the capacitor deteriorates due to overcharge at high temperatures
Solution Approach 1:
The patent applies dynamics by making the full-charge voltage adjustable based on temperature conditions. The control circuit dynamically changes the full-charge voltage threshold between a first value (at low temperatures) and a second value (at high temperatures), allowing the system to adapt to varying thermal environments and prevent overcharge deterioration while maintaining storage performance.
Solution Approach 2:
The patent implements parameter changes by modifying the full-charge voltage parameter according to temperature. The control circuit detects temperature and相应地 changes the voltage threshold parameter, using a higher first full-charge voltage at low temperatures to improve storage performance and a lower second full-charge voltage at high temperatures to prevent overcharge deterioration.
2Quantity of substance
If the full-charge voltage is set high, then energy storage capacity increases, but the capacitor deteriorates faster at high temperatures
Solution Approach 1:
The system dynamically adjusts the full-charge voltage based on temperature conditions. At low temperatures, a higher first full-charge voltage is used to maximize energy storage capacity. At high temperatures, a lower second full-charge voltage is applied to reduce stress on the capacitor and extend its lifespan, thus balancing energy storage with durability.
Solution Approach 2:
The control circuit changes the voltage parameter based on temperature detection. By switching between a first full-charge voltage (higher, for maximum storage) and a second full-charge voltage (lower, for extended lifespan), the system optimizes both energy storage capacity and capacitor longevity under different thermal conditions.
3Device complexity
If a fixed full-charge voltage is used, then the control circuit is simple, but storage performance degrades at low temperatures and overcharge occurs at high temperatures
Solution Approach 1:
The control circuit incorporates temperature-based dynamic voltage adjustment. A temperature detection unit monitors thermal conditions and triggers the control circuit to switch between different full-charge voltage values. This dynamic approach improves storage performance across temperature ranges while maintaining reasonable circuit complexity through integrated control logic.
Solution Approach 2:
The system implements feedback by using the temperature detection unit to monitor thermal conditions and feed this information back to the control circuit. Based on the detected temperature, the control circuit automatically adjusts the full-charge voltage, creating a closed-loop control system that optimizes storage performance without requiring complex external control mechanisms.
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 improves the reliability and storage performance of the capacitor unit by stabilizing the full-charge voltage, reducing variations that cause overcharging, and ensuring energy security at low temperatures, thus enhancing the overall performance and longevity of the capacitor device.
Implementation Method 1
a voltage-dividing circuit for outputting a divided voltage obtained by dividing a voltage of the capacitor unit... The voltage-dividing circuit includes first and second resistors connected in series to each other at a node and a variable resistor unit connected in parallel to the first resistor
Implementation Method 2
a comparator circuit that compares the divided voltage with the reference voltage so as to cause the charge circuit to operate such that the voltage of the capacitor unit reaches a full-charge voltage
Implementation Method 3
The first variable resistor unit includes a third resistor and a first semiconductor switching element connected in series to the third resistor... turning off the first semiconductor switching element when the detected temperature exceeds a reference temperature
Data Source
AI summary
A capacitor device includes a capacitor unit, a voltage-dividing circuit for outputting a divided voltage obtained by dividing a voltage of the capacitor unit, and a comparator circuit. The comparator circuit causes the charge circuit to operate such that the voltage of the capacitor unit reaches a full-charge voltage. The voltage-dividing circuit includes a semiconductor switching element, and outputs a divided voltage. A control circuit is operable to determine the full-charge voltage to be a high-temperature full-charge voltage by turning off the first semiconductor switching element when a temperature at the capacitor unit exceeds a reference temperature. The control circuit is operable to determine the full-charge voltage to be a low-temperature full-charge voltage that is higher than the high-temperature full-charge voltage by turning on the first semiconductor switching element when the detected temperature is not higher than the reference temperature.