Floating Current Mirror for RLG Anode Bias Stability
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Solution Overview
Problem
Conventional Ring Laser Gyroscopes (RLGs) face challenges in maintaining precise matching of discharge currents between their anodes, which is crucial for bias stability, especially when the cathode is near ground potential and the anodes are at several hundred volts above ground, often requiring additional voltage translators.
Innovation Solution
A high voltage power supply circuit is used to provide equal currents to both anodes through a current supply circuit with a self-powered operational amplifier that adjusts the current in the second path to mirror the first current, ensuring matching currents without the need for separate power supplies or low-voltage interfaces, utilizing sense resistors and an insulated-gate field effect transistor for voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage level translators (opto-electric couplers or transformers) are used to control currents at the two anodes, then current matching can be achieved, but device complexity and component count increase
Solution Approach 1:
The patent merges the current control functions for both anodes into a single integrated circuit. The operational amplifier and associated components simultaneously control both anode currents, eliminating the need for separate voltage level translators for each anode. This consolidation reduces component count while maintaining precise current matching through the feedback mechanism.
Solution Approach 2:
The circuit uses the high voltage signal from the power supply to power the operational amplifier and control components directly, eliminating the need for separate low-voltage power supplies or external power sources. The system serves itself by deriving all necessary power from the existing high voltage signal, simplifying the overall power architecture.
2Adaptability or versatility
If separate power supplies or low-voltage interfaces are used, then current control flexibility is improved, but device complexity and component count increase
Solution Approach 1:
The operational amplifier and control circuit are designed to operate directly from the high voltage signal, serving multiple functions: providing power to itself and control components, sensing current levels, and adjusting both anode currents. This multi-functional design eliminates the need for separate power supply circuits while maintaining control flexibility.
Solution Approach 2:
The control circuit powers itself and its components from the high voltage signal it is designed to control. The operational amplifier, resistors, and other components are all energized by the same high voltage source, creating a self-sufficient system that reduces external dependencies and simplifies the power architecture.
3Measurement precision
If conventional voltage translators are used, then current matching is achieved, but bias stability is compromised due to additional components
Solution Approach 1:
By merging the current control functions into a single integrated circuit with operational amplifiers, the patent reduces the number of discrete components that could introduce drift or instability. The unified feedback loop maintains consistent bias conditions across both anodes, improving overall system reliability while achieving precise current matching.
Solution Approach 2:
The operational amplifiers implement feedback mechanisms that continuously monitor and adjust the anode currents to maintain precise matching. This active feedback control compensates for drift and instability that would otherwise be introduced by passive voltage translators, thereby improving bias stability while maintaining current matching precision.
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 solution ensures that the currents to both anodes are matched to a high degree of precision, improving the performance of the RLG by eliminating the need for separate power supplies and low-voltage interfaces, thus enhancing bias stability and operational efficiency.
Implementation Method 1
the second current path is configured to mirror the first current such that the second current approximately matches the first current
Implementation Method 2
The gas produces a stimulated emission when a current is induced across at least a portion of the gas
Data Source
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AI summary
A ring laser gyroscope (RLG) assembly comprises an RLG block comprising:a first anode;a second anode;a cathode; anda cavity. The RLG assembly further comprises a current supply circuit coupled to the RLG block. The current supply circuit comprises a high voltage power supply to provide a high voltage signal;a first current path coupled between the high voltage power supply and the first anode to provide a first current to the first anode; anda second current path coupled between the high voltage power supply and the second anode to provide a second current to the second anode. The second current path is configured to mirror the first current such that the second current approximately matches the first current. Each component in the second current path is configured to operate based on power derived only from the high voltage signal.