Centralized ESD Clamp Circuit for IC Hot-Plug Protection
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Solution Overview
Problem
Integrated circuits, particularly in battery management systems, face challenges in protecting against hot-plug events due to uncontrolled energy transfer, which can cause damage, and existing solutions are either ineffective or increase complexity and cost.
Innovation Solution
An integrated circuit with a dynamic and centralized ESD clamp circuit that activates in response to voltage spikes, diverting inrush current to a single or set of pre-determined output pins, providing deterministic current paths and reducing the need for external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hot-plug protection circuits are used, then circuit protection against hot-plug events is provided, but device complexity and cost increase due to multiple external components
Solution Approach 1:
The patent merges the hot-plug protection functionality into the integrated circuit itself by providing a centralized ESD clamp circuit that is integrated within the IC. This eliminates the need for multiple external protection components (such as individual clamp circuits at each pin), thereby reducing device complexity and cost while maintaining reliable protection against hot-plug events.
Solution Approach 2:
The centralized ESD clamp circuit is designed to handle hot-plug events from multiple input pins through a single protection mechanism. This universal approach allows one protection circuit to serve multiple pins, reducing the overall number of components needed while providing comprehensive protection across all input pins of the integrated circuit.
2Reliability
If multiple external protection components are used, then hot-plug protection is provided, but current leakage and measurement errors increase
Solution Approach 1:
By consolidating protection functionality into a centralized ESD clamp circuit integrated within the IC, the patent minimizes the number of external components and their associated parasitic effects. This reduces current leakage paths that would otherwise interfere with voltage measurements at input pins, thereby improving measurement precision while maintaining hot-plug protection.
3Reliability
If comprehensive hot-plug protection is provided for all connection sequences, then circuit robustness is improved, but cost and complexity increase
Solution Approach 1:
The centralized ESD clamp circuit is designed to provide universal protection that handles hot-plug events regardless of which input pin is affected or in what connection sequence the battery cells are connected. This single protection mechanism covers all possible hot-plug scenarios without requiring separate protection circuits for each pin or connection sequence, thereby maintaining circuit robustness while avoiding increased complexity.
Solution Approach 2:
The ESD clamp circuit is designed to dynamically activate when a hot-plug event is detected, providing protection only when needed rather than being permanently active across all pins. This dynamic operation allows comprehensive protection while maintaining simplicity in the protection circuit 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 enhances the robustness of integrated circuits against hot-plug events, reduces current leakage, and minimizes measurement errors while maintaining affordability and simplicity, effectively addressing the high variability of battery cell connection sequences.
Implementation Method 1
a first determined current path between the pins and the at least one predetermined output pin of the integrated circuit
Data Source
AI summary
An integrated circuit with a hot-plug protection circuit includes input pins and an output pin. The input pins are electrically coupled to a common node in the hot-plug protection circuit via respective electrical connections. The integrated circuit includes clamping circuitry coupled between the common node and the output pin, the clamping circuitry activatable as a result of a voltage spike applied across the clamping circuitry. The plurality of electrical connections and the clamping circuitry provide respective current discharge paths between the input pins in the input pins and the output pin, the respective current discharge paths configured to become conductive as a result of a voltage spike applied to any of the input pins in the plurality of input pins being transferred to the common node via the respective electrical connection in the plurality of electrical connections electrically coupling said any of said input pins to the common node.