Overcharge Protection Circuit for Hot Plugging
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Solution Overview
Problem
Hot plugging in electronic systems can cause local overvoltages due to uneven terminal connections, potentially damaging components, as existing protection circuits fail to effectively manage both overvoltages and overcurrents during the addition of battery stacks or other components to a running system.
Innovation Solution
An overcharge protection circuit is designed with bidirectional ESD diodes and current balancing devices, connected between terminals to provide protection against overvoltages and overcurrents, using a minimal number of components and capable of handling voltage fluctuations and current imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If battery stacks are added to a running system during hot plugging, then the system can be expanded or upgraded without interruption, but local overvoltages occur due to uneven terminal connections which may damage components
Solution Approach 1:
The patent applies preliminary action by equipping each battery terminal with overvoltage protection devices (such as Zener diodes or TVS diodes) before hot plugging occurs. These devices are pre-configured to clamp voltage spikes to safe levels, ensuring that when batteries are connected during hot plugging, any transient overvoltages are immediately limited without damaging other components in the system.
2Reliability
If conventional protection circuits are used during hot plugging, then some protection is provided, but they fail to effectively manage both overvoltages and overcurrents simultaneously
Solution Approach 1:
The patent merges overvoltage protection devices and current limiting devices into a unified protection circuit architecture. Each battery terminal has both types of protection devices connected in parallel, allowing simultaneous management of overvoltages and overcurrents. This combined approach provides comprehensive protection without requiring separate complex protection circuits for each condition.
Solution Approach 2:
The protection circuit is designed with universal components that handle multiple protection functions. The overvoltage protection devices (Zener diodes, TVS diodes) and current limiting devices work together to provide both voltage clamping and current limiting functions, making the protection circuit multi-functional and effective against various hot plugging scenarios without increasing overall complexity.
3Reliability
If multiple protection devices are added to handle both overvoltages and overcurrents, then protection coverage is improved, but the number of components and circuit complexity increases
Solution Approach 1:
The patent segments the protection function by assigning specific roles to different devices at each battery terminal. Overvoltage protection devices (Zener diodes, TVS diodes) handle voltage spikes, while current limiting devices handle excessive currents. This segmentation allows each component to be optimized for its specific function, providing comprehensive protection while keeping the overall component count manageable through functional specialization.
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 effectively prevents damage from overvoltages and overcurrents during hot plugging, ensuring the safety of electronic system components by using a compact and efficient circuit design that includes overvoltage protection devices and current balancing mechanisms.
Implementation Method 1
bidirectional ESD diodes... configured to pass a current if a voltage over the second overvoltage protection device exceeds a threshold
Data Source
AI summary
An overcharge protection circuit comprises a first series of first terminals a second series of second terminals, a first overvoltage protection device connected between each consecutive pair of first terminals, a current balancing device connected between each consecutive pair of second terminals, and a second overvoltage protection device connected between a first terminal and a second terminal. The second overvoltage protection device is configured to pass a current if a voltage over the second overvoltage protection device exceeds a threshold. The second overvoltage protection device may comprise a bidirectional ESD diode, while both the first overvoltage protection device and the second overvoltage protection device may comprise a unidirectional ESD diode.