Switched Electrical Overstress Protection Circuit
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Solution Overview
Problem
Existing circuit protection methods against overvoltage and ESD events often require high voltage or high power components, which are costly and can be damaged by excessive power dissipation, necessitating a more efficient and cost-effective solution.
Innovation Solution
The apparatus includes multiple switched conduction path circuits between terminals, controlled by a control circuit that selectively activates enable signals to manage current flow, using components like Zener diodes and transistors, and temperature sensing to adjust operation based on temperature and current conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage or high power components are used in conduction path circuits to withstand ESD current, then the circuit can effectively dissipate ESD power, but the part cost increases and the semiconductor area required increases
Solution Approach 1:
The patent applies dynamic control by using a control circuit to selectively activate or deactivate conduction path circuits based on detected conditions (overvoltage events, temperature, current levels). This allows the system to provide robust ESD protection when needed while minimizing power dissipation and component stress during normal operation, thereby reducing the need for oversized high-power components and lowering overall system cost
Solution Approach 2:
The patent divides the ESD protection function into multiple separate conduction path circuits (first conduction path circuit, second conduction path circuit, etc.), each with its own enable signal and control logic. This segmentation allows independent control of each protection path, enabling the system to activate only the necessary protection circuits under different conditions, optimizing both protection effectiveness and resource utilization
2Reliability
If high voltage or high power components are used in conduction path circuits to withstand ESD current, then the circuit can effectively dissipate ESD power, but the semiconductor area required increases
Solution Approach 1:
The dynamic activation control allows conduction path circuits to be enabled only when ESD events are detected, rather than continuously operating. This reduces the average power dissipation and thermal load on components, allowing the use of smaller-area components that can handle peak ESD currents temporarily without requiring the continuous high-power handling capability that would demand large semiconductor area
Solution Approach 2:
The control circuit monitors temperature and current conditions, and when thresholds are exceeded, it deactivates conduction path circuits to allow them to cool down and recover. This recovery mechanism prevents cumulative thermal damage and allows components to operate within safe limits, reducing the need for oversized components with large thermal mass and semiconductor area
3Reliability
If multiple conduction path circuits are used to provide redundancy and improve protection, then the reliability of ESD protection increases, but the device complexity increases
Solution Approach 1:
The control circuit automatically monitors system conditions (overvoltage detection, temperature sensing, current levels) and autonomously decides which conduction path circuits to activate or deactivate based on pre-defined thresholds and logic. This self-service capability eliminates the need for complex external control systems or manual intervention, managing the complexity of multiple protection circuits through automated decision-making embedded in the control logic
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 effectively directs overvoltage currents away from sensitive circuits while minimizing component damage and cost, by dynamically controlling current flow through multiple conduction paths based on detected conditions, thus enhancing protection without the need for high-power components.
Implementation Method 1
these conduction path circuits often include high voltage or high power components that can withstand the power (and heat) dissipated by the ESD-related current
Implementation Method 2
The conduction path circuit may include a Zener diode and a switch
Data Source
AI summary
An apparatus includes a first terminal, a second terminal, and a conduction path circuit coupled between the first and second terminals. The conduction path circuit includes an input terminal to receive an enable signal which, when activated, allows the conduction path circuit to conduct electrical current between the first and second terminal. A control circuit coupled to the input terminal of the conduction path circuit is configured to selectively activate the enable signal.