Ultracapacitor Module Balancing via Microcontroller Voltage Monitoring
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Solution Overview
Problem
Existing capacitor modules in series, particularly ultracapacitors, face premature aging due to non-uniform voltage and temperature conditions, leading to uneven lifespan among capacitors, which results in module failure and energy dissipation during balancing attempts.
Innovation Solution
An electronic board with digital control, utilizing a microcontroller for monitoring and balancing ultracapacitors, implements end-of-charge protocols based on individual capacitor conditions, employs active and passive balancing methods, and communicates with other modules to maintain uniform voltage and charge levels, using thermistors for temperature monitoring and dissipative devices for voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If capacitors are deployed in series modules with fixed numbers, then the system can achieve high-power applications, but one capacitor failing earlier than neighbors causes the entire module to be taken out of service
Solution Approach 1:
The system divides the series module into individually monitorable capacitor units with distinct voltage monitoring and balancing circuits, allowing selective management of each capacitor's charge state to prevent premature module failure
Solution Approach 2:
The system implements continuous voltage monitoring and feedback control through microcontrollers that adjust charging/discharging operations based on real-time capacitor voltage states, preventing any single capacitor from failing early and taking down the entire module
2Manufacturing precision
If capacitors are binned according to measured characteristics, then manufacturing precision improves, but later events can still age one capacitor faster than another
Solution Approach 1:
The system dynamically adjusts charging and discharging operations for each capacitor based on real-time voltage measurements and individual capacitor states, rather than relying solely on static manufacturing binning, to equalize aging rates across all capacitors
Solution Approach 2:
The system changes operational parameters (voltage levels, charging/discharging rates) for individual capacitors based on their real-time state, allowing capacitors with slightly different manufacturing characteristics to age uniformly through adaptive control
3Duration of action of stationary object
If voltage load is controlled to prevent premature aging, then capacitor lifespan extends, but energy dissipation occurs during balancing operations
Solution Approach 1:
The system uses intermediary energy storage elements and controlled discharge paths that allow voltage balancing between capacitors without direct energy dissipation, using the capacitors themselves as intermediaries to redistribute energy
Solution Approach 2:
The system recovers energy that would otherwise be dissipated during balancing operations by redirecting it through controlled discharge paths, allowing energy to be stored or reused rather than lost
4Reliability
If temperature and voltage are monitored and controlled, then uniform aging is achieved, but device complexity increases
Solution Approach 1:
The system uses multi-functional microcontrollers that perform voltage monitoring, temperature monitoring, balancing control, and communication functions in single integrated units, reducing overall system complexity despite the comprehensive monitoring required
Solution Approach 2:
The system combines temperature sensors, voltage monitoring circuits, and control logic into integrated modules for each capacitor, reducing the number of separate components and simplifying system architecture
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 extends the lifespan of capacitors by maintaining uniform voltage and temperature conditions within modules, reducing energy dissipation and preventing premature aging, while allowing for efficient balancing and communication between modules.
Implementation Method 1
uses thermistors for temperature monitoring
Implementation Method 2
dissipative devices for voltage regulation
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A device (1) monitors and/or balances an ultracapacitor (3) and/or a module (4) comprising a plurality of ultracapacitors (3) connected in series, the module (4) being connectable in series or in parallel with other modules (4). The device comprises an electronic board (2) comprising digital control and/or command means, such as a microcontroller (5), executing a program for monitoring and balancing the ultracapacitor (3) and/or the module (4). The relative capacitances of the capacitors are measured, and this information is employed to determine when to carry out a controlled discharge of particular capacitors. Temperature information is also employed to determine when to carry out a controlled discharge of particular capacitors. In this way the lifetime of any particular capacitor is, desirably, extended to be no shorter than the lifetime of other longer-lived capacitors in the module.