Optical Voltage Sampling Circuit With Common-Mode Noise Rejection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional voltage sampling systems, particularly those using electromagnetic transformers, face issues such as complex insulating structures, high costs, bulky volumes, and the risk of ferromagnetic resonance, while hybrid electronic transformers face challenges in structure design, high-voltage power supply, digital signal processing, and sensor protection.
Innovation Solution
A voltage sampling system comprising a voltage sampling device with a voltage-dividing resistor module, a common mode rejection circuit, and an analog-to-digital converter, coupled with optic-fiber transmission lines and a control device, which performs voltage division, common-mode noise rejection, and digital signal processing to generate and transmit digital data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electromagnetic transformer is used for voltage sampling, then voltage sampling can be achieved, but the insulating structure becomes complicated, volume increases, manufacture cost rises, and ferromagnetic resonance may occur damaging the device
Solution Approach 1:
The patent replaces the electromagnetic transformer (a mechanical/electromagnetic system with ferromagnetic core and winding) with an electronic voltage sampling device using voltage-dividing resistors, common mode rejection circuits, and analog-to-digital converters. This substitution eliminates the complex insulating structure and ferromagnetic resonance issues while achieving the same voltage sampling function through electronic means.
Solution Approach 2:
The patent extracts and removes the problematic electromagnetic transformer component from the voltage sampling system, replacing it with a simplified electronic circuit architecture that achieves voltage sampling without the ferromagnetic core, windings, and associated insulating structures, thereby eliminating the source of ferromagnetic resonance and reducing overall system complexity.
2Reliability
If an electromagnetic transformer is used for voltage sampling, then voltage sampling can be achieved, but manufacture cost increases
Solution Approach 1:
The patent employs inexpensive electronic components such as voltage-dividing resistors, common mode rejection circuits, and integrated analog-to-digital converters instead of expensive electromagnetic transformers with complex insulating structures and precision-wound coils. These electronic components are cheaper to manufacture, assemble, and replace, significantly reducing overall system cost while maintaining voltage sampling accuracy.
3Reliability
If an electromagnetic transformer is used for voltage sampling, then voltage sampling can be achieved, but volume increases
Solution Approach 1:
The patent replaces the bulky electromagnetic transformer with compact electronic circuitry including voltage-dividing resistor networks, common mode rejection circuits, and integrated analog-to-digital converters. These electronic components occupy significantly less space while achieving the same voltage sampling function, thereby reducing overall device volume.
4Power
If ferromagnetic resonance occurs in the electromagnetic transformer, then electromagnetic energy is transformed, but the device is damaged
Solution Approach 1:
The patent removes the ferromagnetic core and associated winding structure from the voltage sampling system, eliminating the possibility of ferromagnetic resonance entirely. The voltage sampling function is achieved through passive voltage-dividing resistors and electronic signal processing, which do not exhibit ferromagnetic resonance phenomena, thereby protecting the device from resonance-induced damage.
Solution Approach 2:
The patent converts the problematic electromagnetic resonance issue into a benefit by using electronic voltage sampling that is inherently immune to ferromagnetic resonance. The electronic circuitry processes voltage signals without relying on ferromagnetic materials, transforming a potential harm (resonance damage) into a reliable operating characteristic of the sampling system.
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 system effectively samples and processes high-voltage signals with reduced complexity, cost, and risk of damage, enabling efficient digital data transmission and processing while providing over-voltage protection, thus overcoming the limitations of existing technologies.
Implementation Method 1
a voltage-dividing resistor module including a first voltage-dividing resistor unit, a central voltage-dividing resistor unit and a second voltage-dividing resistor unit which are sequentially electrically connected in series between two terminals of a voltage source
Implementation Method 2
The common mode rejection circuit is configured to receive the first divided voltage and the second divided voltage to perform a common-mode noise rejecting process and generate an output voltage
Implementation Method 3
The analog-to-digital converter is configured to convert the output voltage from analog format to digital format, so as to generate a digital data signal
Implementation Method 4
The optic-fiber transmission lines are configured to transmit the digital data signal and a clock signal respectively
Data Source
AI summary
A voltage sampling system is provided. The voltage sampling system includes a voltage sampling device, two optic-fiber transmission lines and a control device. The voltage sampling device includes a voltage-dividing resistor module, a common mode rejection circuit and an analog-to-digital converter. The voltage-dividing resistor module generates a first and a second divided voltages according to a voltage source. The common mode rejection circuit receives the first and the second divided voltages to perform a common-mode noise rejecting process to generate an output voltage. The analog-to-digital converter converts the output voltage to generate a digital data signal. The two optic-fiber transmission lines transmit the digital data signal and a clock signal respectively. The control device receives the digital data signal from the analog-to-digital converter and the clock signal to perform a digital data processing.