ESD Protection Circuit with Parallel Discharge Paths
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Solution Overview
Problem
Conventional ESD protection circuits are inefficient in instant discharge, leading to potential malfunctions or crashes in protected circuits due to lengthy discharge paths during ESD events, failing to effectively manage instant signal variations.
Innovation Solution
An ESD protection circuit comprising a detection voltage generating circuit, a comparing circuit, and a control circuit that generates a control signal to indicate abnormal conditions, allowing the protected circuit to perform self-protection operations, such as suspending normal operations or discharging abnormal energy, by comparing detection voltages with reference voltages and generating alerts for predetermined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional ESD protection circuit uses a lengthy discharge path via power supply terminals, then the circuit structure is simple, but the discharge speed is slow and instant signal variation cannot be effectively managed
Solution Approach 1:
The patent segments the discharge path into multiple parallel paths: a first discharge path through the power supply terminal (conventional path) and a second discharge path directly connected to ground (new fast path). This segmentation allows different discharge speeds for different scenarios, resolving the contradiction between simple structure and fast discharge speed.
Solution Approach 2:
The patent introduces a detection voltage generating circuit as an intermediary that monitors the voltage at the protected circuit's input terminal. This intermediary detects abnormal conditions and triggers the fast discharge path, enabling rapid response without requiring complex direct sensing mechanisms throughout the circuit.
2Reliability
If a conventional ESD protection circuit discharges through a lengthy path via power supply terminal, then the circuit design is straightforward, but the protected circuit may malfunction or crash due to delayed discharge
Solution Approach 1:
The patent implements preliminary action by providing a pre-configured fast discharge path that is ready to activate immediately upon detection of ESD events. The detection voltage generating circuit continuously monitors conditions in advance, so when ESD occurs, the fast discharge path can be activated without delay, preventing malfunction or crash of the protected circuit.
Solution Approach 2:
The patent makes the discharge path dynamic by switching between a conventional slow discharge path and a fast discharge path based on detected conditions. The control circuit dynamically selects the appropriate discharge path, enabling the system to adapt its discharge speed to the situation, thereby improving reliability while minimizing time loss.
3Speed
If an ESD protection circuit adds detection and control circuits to enable fast discharge, then the discharge speed improves, but the circuit complexity increases
Solution Approach 1:
The patent implements self-service through the detection voltage generating circuit that automatically monitors the input terminal voltage and triggers the fast discharge path when ESD conditions are detected. This self-monitoring and self-triggering mechanism eliminates the need for external control systems, achieving fast discharge speed while keeping the control architecture relatively simple.
Solution Approach 2:
The detection voltage generating circuit serves multiple functions: it monitors voltage conditions, detects ESD events, and triggers the appropriate discharge path. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby achieving fast response speed while limiting the increase in overall circuit complexity.
Data Source
AI summary
The present invention discloses an electrostatic discharge (ESD) protection circuit, including: a first terminal configured to receive a first voltage; a second terminal configured to receive a second voltage; a detection voltage generating circuit configured to provide a detection voltage according to the first voltage and the second voltage; a warning circuit configured to generate a control signal according to the detection voltage, in which the control signal indicates a normal condition when the detection voltage satisfies predetermined voltage setting, and the control signal indicates an abnormal condition when the detection voltage does not satisfy the predetermined voltage setting; and a protected circuit configured to carry out a self-protection operation when receiving the control signal indicating the abnormal condition.