Comparator Power Detection Circuit With Leakage Current Limiting
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Solution Overview
Problem
Existing power detection circuits suffer from high leakage currents, leading to inefficiency and increased power consumption due to the continuous comparison of input voltage with threshold values, which results in unnecessary power consumption during standby modes.
Innovation Solution
A power detection circuit incorporating a comparator circuit, current limiting circuit, and feedback circuit that compares input voltage with predetermined threshold values, changing output logic states based on these thresholds, and uses current limiting circuits to minimize leakage currents by varying the threshold values and controlling the current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous voltage comparison is performed to detect power status, then power detection accuracy is improved, but leakage current increases
Solution Approach 1:
The patent implements periodic action by enabling the voltage comparison function only during active power transitions rather than continuously. The comparator is activated selectively based on power state changes, performing voltage comparisons only when needed for detection, thereby maintaining detection accuracy while eliminating continuous operation that causes leakage current.
Solution Approach 2:
The patent applies self-service through the feedback circuit that automatically controls the comparator's operation based on detected power states. The system monitors its own operation and adjusts the comparison function accordingly, enabling the comparator only when power transitions are detected, thus eliminating unnecessary leakage current while maintaining detection capability.
2Reliability
If voltage comparison function operates continuously, then power detection reliability is improved, but power consumption increases
Solution Approach 1:
The voltage comparison function operates periodically rather than continuously, being activated only during power transitions. This periodic operation maintains reliable detection of power states while significantly reducing overall power consumption by keeping the comparator inactive during stable power conditions.
Solution Approach 2:
The feedback circuit provides continuous monitoring of power states and uses this information to control the comparator's operation. This feedback mechanism ensures reliable power detection by activating the comparator only when power transitions are detected, maintaining reliability while minimizing unnecessary power consumption during idle periods.
3Measurement precision
If comparator circuit continuously monitors input voltage, then detection precision is improved, but standby power loss increases
Solution Approach 1:
The comparator circuit performs voltage comparisons periodically rather than continuously, activating only during power transitions when detection is needed. This approach maintains high detection precision during active periods while eliminating standby power loss during stable power conditions when monitoring is unnecessary.
Solution Approach 2:
The system monitors its own power state and automatically controls the comparator's activation accordingly. When power states are stable, the comparator remains inactive, eliminating standby power loss. When transitions occur, the comparator activates automatically to maintain detection precision, achieving self-regulated operation.
Data Source
AI summary
A power detection circuit is provided. The power detection circuit includes a comparator circuit operative to generate an output signal in response to an input signal. The output signal is configured to change from a first value to a second value in response to the input signal attaining a first threshold value. The output signal is configured to change from the second value to the first value in response to the input signal subsequently attaining a second threshold value. A current limiting circuit is connected to the comparator circuit and operative to limit a leakage current of the comparator circuit.