Ultracapacitor Balancing Circuit with Hard Switching Regulator
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Solution Overview
Problem
Electrical energy storage devices like ultracapacitors face overvoltage issues that can lead to damage, and existing technologies lack effective solutions for regulating voltage across multiple cells in a module to prevent such damage.
Innovation Solution
A balancing circuit is introduced, comprising a regulator and a switching circuit with semiconductor elements that operate in a hard switching manner, comparing input voltage to a reference voltage to charge or discharge the ultracapacitor, maintaining voltage within a desired range by switching between discharging and charging states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple ultracapacitors are combined to form a module with raised output voltage or increased energy capacity, then the energy storage capability and output voltage are improved, but voltage imbalance and overvoltage conditions occur across individual cells leading to potential damage
Solution Approach 1:
The balancing circuit continuously monitors the voltage across each ultracapacitor cell and provides feedback control. When a cell voltage exceeds a predetermined threshold, the circuit activates switching elements to discharge that specific cell, creating a closed-loop feedback system that maintains voltage balance across all cells in the module.
Solution Approach 2:
The balancing circuit acts as an intermediary between the ultracapacitor cells and the load. It includes switching elements (first and second switching elements) that can selectively connect or disconnect individual cells from the circuit, mediating the voltage distribution and preventing overvoltage conditions by diverting excess voltage through discharge paths.
2Reliability
If existing voltage regulation technologies are used, then some voltage control is achieved, but they lack effectiveness in preventing overvoltage damage to ultracapacitor cells
Solution Approach 1:
The balancing circuit is segmented into separate control paths for each ultracapacitor cell. Each cell has its own switching elements (first switching element and second switching element) and voltage threshold monitoring, allowing independent control and discharge of individual cells. This segmentation enables targeted overvoltage protection without requiring complex system-wide intervention.
3Loss of energy
If switching elements operate in soft switching manner, then switching losses are reduced, but the discharging control precision and response speed to overvoltage conditions deteriorate
Solution Approach 1:
The balancing circuit employs periodic switching action to discharge ultracapacitor cells. The switching elements are activated in a periodic manner based on voltage threshold comparisons, creating pulsed discharge cycles that effectively regulate voltage while allowing the circuit to reset between switching events, balancing energy loss and response speed.
Data Source
AI summary
Balancing circuits for an ultracapacitor module are provided. In some implementations, the balancing circuit can include a regulator having an input. The regulator can be configured to compare an input voltage associated with the ultracapacitor received at the input to a reference voltage and to provide an output via an output node. The balancing circuit can further include a switching circuit coupled to the regulator. The switching circuit can be configured to discharge the ultracapacitor based at least in part on the output of the regulator. The switching circuit can include at least one semiconductor switching element operated in a hard switching manner during operation of the switching element.