Electrical Discharge Circuit for ESD Protection
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Solution Overview
Problem
Electrostatic discharge (ESD) can cause permanent damage to electronic components, affecting integrated circuit functionality, and existing protection methods are inadequate in detecting and responding quickly to ESD events.
Innovation Solution
An electrical discharge circuit comprising a voltage-dividing circuit, detection circuit, inverters, switch circuits, and discharge transistors that directly detect voltage variations caused by ESD, allowing for rapid and controlled discharging without relying on conventional RC circuits, ensuring stable discharging and preventing voltage exceeding component withstand limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional RC circuits are used for ESD detection and discharging, then the circuit structure is simple, but the response speed is slow and the detection precision is insufficient
Solution Approach 1:
The circuit is divided into distinct functional modules: voltage-dividing circuit for voltage scaling, detection circuit for ESD event detection, inverter control circuit for signal processing, and discharge transistor control for precise discharging. This segmentation allows each module to be optimized for its specific function, improving overall response speed while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent replaces conventional RC circuit-based detection with an active detection circuit using transistors and inverters. This substitution enables faster response times by using active electronic components with lower time constants compared to passive RC circuits, while the modular architecture keeps the complexity increase可控.
2Measurement precision
If voltage-dividing circuit and detection circuit are added to improve detection precision, then the detection precision is improved, but the device complexity increases
Solution Approach 1:
The voltage-dividing circuit serves multiple functions: it scales down high voltage for safe detection, provides voltage reference for the detection circuit, and protects downstream components from voltage spikes. The detection circuit simultaneously detects ESD events and generates control signals. This multi-functionality reduces the need for separate dedicated components, improving detection precision without proportionally increasing complexity.
Solution Approach 2:
The voltage-dividing circuit acts as an intermediary between the high-voltage input terminal and the low-voltage detection circuit. It transforms the high-voltage ESD event into a safe, measurable voltage level while preserving the essential characteristics of the ESD waveform, enabling precise detection without exposing sensitive components to dangerous voltage levels.
3Productivity
If rapid discharging is achieved through active control circuits, then the response speed is improved, but the manufacturing complexity increases
Solution Approach 1:
The inverter control circuit is pre-configured with logic that automatically activates the discharge transistor when an ESD event is detected. The circuit performs preliminary signal processing and threshold comparison, so that when ESD occurs, the discharge transistor can be activated immediately without requiring complex real-time decision-making during the ESD event itself. This preliminary preparation enables fast response while using standard, easily manufacturable logic circuits.
Solution Approach 2:
The detection circuit automatically generates the control signal for the discharge transistor based on the detected voltage level. When the voltage-dividing circuit detects an ESD event, the detection circuit self-activates and produces the appropriate control signal without external intervention. This self-service mechanism eliminates the need for complex external control systems and enables rapid autonomous response to ESD events.
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 circuit effectively and quickly responds to ESD events, maintaining stable discharging activity and reducing the area of RC circuits, thereby enhancing the protection of electronic components from ESD damage.
Implementation Method 1
a voltage-dividing circuit (110) electrically coupled to a voltage input terminal (IO) to generate a detection signal (DS) at a voltage-dividing terminal (DT)
Implementation Method 2
The detection circuit is configured to operate according to a second voltage smaller than the first voltage to perform voltage-boost on the detection signal to generate a boosted detection signal
Implementation Method 3
The inverter control circuit is configured to operate according to the first voltage to boost the boosted detection signal to generate a control signal inverted to the boosted detection signal to the first inverter input terminal
Implementation Method 4
the first discharge transistor and the second discharge transistor are turned on to discharge the voltage input terminal
Data Source
AI summary
The present disclosure discloses an electrical discharge circuit. A voltage-dividing circuit performs voltage division on a voltage input terminal such that a detection circuit generates a boosted detection signal accordingly. A first inverter is coupled to a first voltage feeding terminal and a second inverter input terminal. A second inverter is coupled to a first inverter output terminal and a ground terminal. An inverter control circuit boosts the boosted detection circuit to generate an inverted control signal to a first inverter input terminal. A first switch circuit is coupled to one of the first and the second inverter terminals and the ground terminal. The boosted detection signal turns on and turns off the first and the second switch circuits respectively when an ESD input occurs such that a first and a second discharge transistors controlled by the inverter output terminals turn on to discharge the voltage input terminal.