Bias Voltage Circuit for Transient Suppression Devices
Solution Overview
Problem
Existing transient suppression components in electrical circuits introduce parasitic effects such as capacitance and leakage current, degrading signal performance, especially in signal lines exposed to energetic transients like lightning strikes.
Innovation Solution
A circuit that biases transient suppression devices with a direct current (DC) voltage above the sum of the power voltage differential and signal level, reverse-biasing steering diodes to minimize parasitic effects and enhance signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transient suppression components are used to handle energetic transients, then transient protection capability is improved, but parasitic capacitance and leakage current increase, degrading signal performance
Solution Approach 1:
The patent applies dynamic biasing to the transient suppression device, where a bias voltage is applied to the suppression circuitry to dynamically control its operating state. This allows the device to maintain low parasitic capacitance during normal operation while providing adequate transient suppression when needed, resolving the contradiction between protection capability and signal performance degradation.
Solution Approach 2:
The patent changes the operating parameters of the transient suppression device by applying a bias voltage that shifts the operating point of the suppression circuitry. This parameter change enables the device to operate in a state with minimized parasitic effects under normal conditions while maintaining transient suppression capability, thus resolving the technical contradiction.
2Reliability
If physically large transient suppression components are used to handle highly energetic transients, then transient suppression capability is improved, but undesired capacitance and leakage current drain increase, degrading signal performance
Solution Approach 1:
The patent uses dynamic biasing to control the state of the transient suppression components, allowing them to operate with minimal parasitic effects during normal signal transmission while providing robust suppression capability when transients occur. This dynamic control resolves the contradiction between handling highly energetic transients and minimizing signal degradation.
Solution Approach 2:
The bias voltage is applied in advance to the transient suppression device to pre-condition it for optimal performance. This preliminary action ensures that the suppression circuitry is in the correct operating state before transients occur, minimizing parasitic effects during normal operation while maintaining readiness for transient suppression.
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 effectively reduces the impact of transient suppression components on signal lines, minimizing capacitance and leakage current, thereby improving signal integrity and performance.
Implementation Method 1
The DC output voltage is provided at a level that is above the sum of a maximum amplitude of the power voltage differential between the first and second signal lines and a signal level between the first and second signal lines
Data Source
AI summary
Embodiments provide a charge pump circuit which produces a bias voltage that is applied to a transient suppression device used to clamp both positive and negative transients on signal lines. The bias voltage can be set to a level that is above the sum of a DC voltage differential between positive and negative signal lines and the maximum signal voltage.