Optical Voltage Probe with Crossed Lines for ESD Accuracy
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Solution Overview
Problem
Conventional optical voltage probes fail to accurately measure voltage signals during ESD tests due to the influence of varying magnetic fields generated by discharged currents, which induce electromotive forces that interfere with the measurement.
Innovation Solution
The optical voltage probe design includes crossed contact terminals and electric lines in a non-contact manner, with adjustable areas and lengths to cancel induced electromotive forces, using a branch interference type optical modulator on a lithium niobate crystal substrate to convert voltage signals into optical intensity modulation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical voltage probes are used to measure voltage signals during ESD tests, then the measurement can be performed, but the measurement accuracy deteriorates due to induced electromotive forces from varying magnetic fields
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the varying magnetic field generated during ESD tests to induce electromotive forces in a controlled manner. By designing the electric lines to form closed loops with specific areas, the induced electromotive forces are converted from harmful interference signals into compensating signals that cancel out the unwanted magnetic field effects, thereby improving measurement accuracy during ESD testing
Solution Approach 2:
The patent implements preliminary anti-action by pre-configuring the electric lines and contact terminals to create closed loops with specific geometric arrangements before the ESD test begins. This preliminary setup ensures that when varying magnetic fields are present during testing, the induced electromotive forces automatically cancel out the harmful effects, providing proactive protection against measurement errors without requiring real-time compensation
2Device complexity
If contact terminals and electric lines are arranged in conventional configurations, then the device structure is simple, but induced electromotive forces from magnetic fields interfere with voltage measurements
Solution Approach 1:
The patent applies segmentation by dividing the electric line structure into multiple segments with specific geometric configurations. The electric lines are arranged to form closed loops with defined areas, and the contact terminals are positioned at specific locations along these segments. This segmented arrangement allows the structure to maintain relative simplicity while creating the necessary geometric properties to cancel induced electromotive forces through controlled loop areas
Solution Approach 2:
The patent employs asymmetry in the geometric arrangement of electric lines and contact terminals to optimize the cancellation of induced electromotive forces. By creating closed loops with specific asymmetric geometric configurations, the patent ensures that the induced electromotive forces from varying magnetic fields cancel out effectively, improving measurement accuracy without requiring perfectly symmetric structures
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
This design effectively reduces the impact of surrounding magnetic fields, allowing accurate measurement of voltage signals by canceling induced electromotive forces, suitable for ESD tests and other environments with varying magnetic fields.
Implementation Method 1
a voltage signal obtained from contact terminals is applied on an optical modulator, and the optical modulator converts the voltage signal into an optical modulation signal
Implementation Method 2
when a magnetic field penetrating between the first contact terminal and the second contact terminal or between the first electric line and the second electric line varies, electromotive forces in opposite directions are induced between the first contact terminal and the second contact terminal or between the first electric line and the second electric line at portions before and after the crossing portion by the magnetic field which varies
Data Source
AI summary
An optical modulator configured to modulate an intensity of an incident light depending on a voltage between first and second electrode pads; first and second contact terminals that are configured to be in contact with the measurement point; a first electric line connecting the first contact terminal with the first electrode pad; and a second electric line connecting the second contact terminal with the second electrode pad are provided, the first and second contact terminals or the first and second electric lines are crossed with each other at least one time in a non-contact manner, and electromotive forces in opposite directions are induced between the first and second contact terminals or between the first and second electric lines at portions before and after a crossing portion when a magnetic field penetrating between the first and second contact terminals or between the first and second electric lines varies.


