ESD Filtering Circuit Current Division for Voltage Stability
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Solution Overview
Problem
High electro-static discharge (ESD) events can cause sudden voltage drops in digital circuits, leading to malfunction or damage due to low pulse peaks in power source signals.
Innovation Solution
An ESD filtering circuit comprising a first current dividing circuit with a constant voltage drop and a second current dividing circuit as a pure resistor element, which shares and aggregates currents to form a stable power source signal, limiting the shared current during ESD events to prevent voltage drops in the power source signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power source signal is used in digital circuits, then the circuit can operate normally under normal conditions, but when ESD occurs causing voltage to instantly drop, the circuit experiences low voltage peaks that can cause malfunction or damage
Solution Approach 1:
The patent introduces an intermediary ESD filtering circuit between the power source and the digital circuit. This filtering circuit acts as a mediator that processes the power source signal, filtering out ESD-induced voltage drops while allowing normal power delivery. The intermediary circuit protects the digital circuit from harmful voltage fluctuations without affecting normal operation.
Solution Approach 2:
The patent converts the harmful ESD voltage drops into a beneficial filtering action. By designing the ESD filtering circuit with specific impedance characteristics, the harmful voltage spikes are transformed into filtered signals that can safely power the digital circuit. The harmful ESD energy is dissipated or redirected through the filtering mechanism, turning a potentially damaging event into a safe operating condition.
2Object-affected harmful factors
If the ESD filtering circuit uses a first current dividing circuit with constant voltage drop and a second current dividing circuit as pure resistor elements, then the shared current is limited during ESD events, but the circuit complexity increases
Solution Approach 1:
The ESD filtering circuit is segmented into multiple functional blocks: a first current dividing circuit with constant voltage drop characteristics and a second current dividing circuit with pure resistor elements. This segmentation allows each block to perform a specific function in the ESD filtering process, making the overall complex function manageable and implementable through modular design.
Solution Approach 2:
The patent utilizes parameter changes in the current dividing circuits to achieve ESD filtering. By changing the impedance parameters and voltage drop characteristics of the current dividing circuits, the circuit automatically adjusts its behavior during ESD events. The parameter changes enable the circuit to limit shared current during voltage drops while maintaining normal operation under standard conditions.
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 solution ensures that digital circuits using the filtered power source signal can operate normally and prevents damage from ESD events by reducing the speed of voltage drops, and the reset circuit generates a reset signal without being triggered by low voltage peaks.
Implementation Method 1
Electro-static discharge (ESD) is an objective natural phenomenon, which may be caused in such ways as contact, friction, and the like. ESD is characterized by high voltage, low power, small current, and short action time.
Implementation Method 2
a first current dividing circuit and a second current dividing circuit in the ESD filtering circuit respectively share a current of the first power source signal and aggregate the shared currents to form a second power source signal upon filtering
Data Source
AI summary
This document discusses, among other things, an electro-static discharge (EDS) filtering circuit and method, a reset circuit, and an electronic device. The ESD filtering circuit comprises a first current dividing circuit and a second current dividing circuit which respectively share a current of a first power source signal and aggregate the shared currents to form a second power source signal upon filtering, wherein a voltage drop of the first current dividing circuit is constant and the second current dividing circuit is a pure resistor element circuit.