Dual-Layer Current Limiter Circuit for Power Efficiency
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Solution Overview
Problem
Current limiting circuits in electrical circuits face challenges in efficiently managing power consumption and response speed, particularly in balancing protection against current spikes and reducing overall power dissipation during low power modes.
Innovation Solution
A dual-layer current limiting circuit comprising an accurate/fast current limiter and a coarse/slow current limiter, where the accurate/fast limiter is activated above a first threshold and the coarse/slow limiter controls the accurate/fast limiter above a lower second threshold, optimizing power consumption by keeping the accurate/fast limiter off during low power modes and using low-power components for the coarse/slow limiter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the accurate/fast current limiter circuit is continuously active, then rapid response to current spikes is ensured, but power consumption increases during low power modes
Solution Approach 1:
The patent implements a dynamic control mechanism where the accurate/fast current limiter circuit is activated or deactivated based on operating conditions. A control circuit monitors the state of the pass device and selectively enables the accurate/fast current limiter when rapid response is needed (when pass device is ON) and disables it during low power modes (when pass device is OFF), thus adapting the system's responsiveness to actual operational requirements and reducing unnecessary power consumption.
2Reliability
If the accurate/fast current limiter circuit operates continuously, then current spike protection is maintained, but heat dissipation increases
Solution Approach 1:
The system dynamically adjusts the activation state of the accurate/fast current limiter based on the operational state of the pass device. When the pass device is OFF during low power modes, the accurate/fast current limiter is also deactivated, eliminating unnecessary heat generation. When the pass device is ON and protection is needed, the accurate/fast current limiter activates to provide rapid current spike protection, thus maintaining reliability only when actually required and minimizing energy loss as heat.
3Device complexity
If a single current limiter circuit is used, then circuit complexity is reduced, but both response speed and power consumption optimization cannot be achieved simultaneously
Solution Approach 1:
The patent divides the current limiting function into two distinct circuits: a coarse/slow current limiter that operates continuously with low power consumption for basic protection, and an accurate/fast current limiter that activates only when needed for rapid response. This segmentation allows each circuit to be optimized for its specific function - the coarse limiter for power efficiency and the accurate limiter for speed - while the control circuit coordinates them to achieve both optimization goals simultaneously without excessive complexity.
Data Source
AI summary
A current limiter circuit for limiting current through a pass device is disclosed. The current limiter circuit includes a accurate/fast current limiter circuit, a coarse/slow current limiter control circuit and a pass device having an input port, an output port and an on/off control port. A control circuit couple to the accurate/fast current limiter circuit and the on/off control port is also included. The accurate/fast current limiter circuit is coupled to the input port and the output port and the coarse/slow current limiter control circuit is coupled to the input port and the output port and an on/off control port of the accurate/fast current limiter circuit.