Bidirectional Current Limiter Circuit with Scaled Sensing
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Solution Overview
Problem
Current devices for protecting against voltage and current spikes in electrical circuits are inefficient, consuming excess power and requiring additional space, and often fail to effectively limit current flow in both directions, leading to potential damage from transient events like lightning strikes or space constraints in spacecraft.
Innovation Solution
A current limiter circuit system comprising a steady state sensing circuit, switching circuit, detection circuit, and enable circuit that monitors and controls current flow between a power source and a load, using a scaled current proportional to the voltage difference to limit current in both directions, thereby reducing power consumption and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diodes are used to protect against current spikes, then current direction control is improved, but power consumption increases
Solution Approach 1:
The patent combines the current limiting function with the direction control function into a single circuit implementation. The current limiter circuit integrates sensing elements, control logic, and switching mechanisms that simultaneously monitor current magnitude and direction while limiting excessive current flow, eliminating the need for separate diode components and reducing overall power consumption.
Solution Approach 2:
The current limiter circuit is designed to perform multiple functions: it limits current magnitude, controls current direction, and provides protection against voltage spikes all within a single circuit architecture. This multi-functional approach replaces the need for separate protective components like diodes, thereby reducing power consumption while maintaining comprehensive protection capabilities.
2Reliability
If separate surge protector devices are used, then protection capability is improved, but device space increases
Solution Approach 1:
The patent integrates the surge protection functionality directly into the existing power supply or load circuitry. The current limiter circuit shares common components such as sensing elements, control logic, and switching mechanisms with the main circuit, thereby providing surge protection without requiring separate protective devices and minimizing additional space requirements.
Solution Approach 2:
The circuit is designed to simultaneously provide current limiting, direction control, and surge protection functions within a single integrated structure. This multi-functional design eliminates the need for separate surge protector devices, thereby maintaining comprehensive protection capability while minimizing the total device space required.
3Device complexity
If current limiting is implemented in one direction only, then circuit simplicity is improved, but protection effectiveness deteriorates
Solution Approach 1:
The patent segments the current sensing and control functions into directional components. The circuit uses separate sensing paths or control logic branches to independently monitor and limit current flow in each direction, allowing comprehensive bidirectional protection while maintaining relatively simple circuit implementation through modular functional blocks.
Solution Approach 2:
The current limiting mechanism is applied locally to each current direction with direction-specific control parameters. The circuit adjusts its limiting characteristics based on the current flow direction, providing optimized protection for each direction while maintaining overall circuit simplicity through localized control strategies rather than complex global control mechanisms.
Data Source
AI summary
An apparatus comprising a steady state sensing circuit, a switching circuit, and a detection circuit. The steady state sensing circuit is connected to a first, a second and a third node. The first node is connected to a first device, the second node is connected to a second device, and the steady state sensing circuit causes a scaled current to flow at the third node. The scaled current is proportional to a voltage difference between the first and second node. The switching circuit limits an amount of current that flows between the first and second device. The detection circuit is connected to the third node and the switching circuit. The detection circuit monitors the scaled current at the third node and controls the switching circuit to limit the amount of the current that flows between the first and second device when the scaled current is greater than a desired level.