ESD Discharge Circuit With Stable Feedback and Fast Voltage Detection
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Solution Overview
Problem
Electrostatic discharge (ESD) can cause permanent damage to electronic components, and existing ESD protection circuits often struggle with unstable discharging mechanisms and inadequate response times.
Innovation Solution
An electrical discharge circuit with a stable discharging mechanism, comprising a voltage division circuit, a first inverter, a voltage boosting circuit, a second inverter, and an ESD transistor, which directly detects voltage variations caused by ESD inputs without relying on RC circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection circuits are used, then basic ESD protection is provided, but the discharging mechanism is unstable and response time is insufficient
Solution Approach 1:
The patent implements dynamic control of the ESD transistor through a feedback mechanism. The control circuit continuously monitors the voltage at the protection terminal and dynamically adjusts the gate voltage of the ESD transistor accordingly. When over-voltage is detected, the control circuit activates the ESD transistor; when voltage returns to normal, it deactivates the transistor, creating a stable yet responsive discharging mechanism.
Solution Approach 2:
The patent employs a feedback control mechanism where the voltage detection at the protection terminal feeds back to the control circuit, which then adjusts the ESD transistor gate voltage. This closed-loop feedback ensures that the ESD transistor activates only when necessary (improving stability) and responds quickly to voltage changes (improving response time), resolving the contradiction between stable discharging and fast response.
2Measurement precision
If voltage detection is implemented without voltage boosting, then circuit complexity is reduced, but the detection precision is insufficient to reliably trigger ESD discharge
Solution Approach 1:
The patent introduces a voltage boosting circuit as an intermediary between the voltage detection node and the ESD transistor gate. This intermediary circuit amplifies the detected voltage signal to an appropriate level for reliable transistor triggering. The voltage booster ensures precise detection and reliable activation without requiring complex detection circuits, as it simply amplifies the existing detection signal.
Solution Approach 2:
The voltage boosting circuit changes the voltage parameter of the detection signal to make it suitable for controlling the ESD transistor. By transforming the detection voltage to a higher level through the boosting circuit, the system achieves precise voltage detection and reliable transistor triggering without increasing overall circuit complexity significantly.
3Reliability
If the ESD transistor remains continuously active, then ESD protection is always available, but normal signal operation is interfered with and power is wasted
Solution Approach 1:
The patent implements periodic monitoring and conditional activation of the ESD transistor. Instead of continuous activation, the control circuit periodically checks the voltage at the protection terminal through the detection circuit and only activates the ESD transistor when over-voltage conditions are detected. This periodic action ensures protection is available when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The ESD protection circuit serves itself through automatic activation and deactivation based on voltage conditions. The detection circuit monitors the voltage and automatically triggers the ESD transistor only when protection is needed, without requiring continuous external control. This self-service mechanism ensures protection availability while avoiding unnecessary power consumption during normal operation.
Data Source
AI summary
The present invention discloses an electrical discharge circuit having stable discharging mechanism is provided. A voltage division circuit generates a detection signal based on a voltage input terminal such that a first inverter outputs an inverted detection signal. First PMOS and NMOS circuits are coupled in series between a voltage input terminal and a ground terminal through a first terminal. Second PMOS and NMOS circuits are coupled in series between the voltage input terminal and the ground terminal through a second terminal. A first and a second PMOS control terminals are coupled to the second terminal and the first terminal respectively. A first and a second NMOS control terminals receive the inverted detection signal and the detection signal respectively. A second inverter receives an inverted boost detection signal from the second terminal and outputs a boost detection signal. AN ESD transistor is turned off due to the boost detection signal to discharge the voltage input terminal.