Current Mirror Leakage Compensation With Compensation Current Limiting
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Solution Overview
Problem
High power transistors experience current leakage that increases with temperature, potentially damaging connected circuits and leading to inefficiency due to excessive leakage compensation current consumption.
Innovation Solution
A current leakage limit circuit is introduced, comprising a first current mirror and a current source, to limit the compensation current and prevent it from exceeding a certain value, thereby maintaining circuit efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If leakage compensation current is increased to compensate for temperature-induced leakage in high power transistors, then leakage current compensation effectiveness is improved, but power consumption increases excessively
Solution Approach 1:
The patent implements dynamic adjustment of compensation current based on operating conditions. The circuit uses multiple compensation current paths with different magnitudes that can be selectively activated based on temperature and load conditions, allowing the compensation current to adapt dynamically rather than being fixed at a high constant value.
Solution Approach 2:
The patent changes the parameter of compensation current magnitude by providing multiple current paths with different current levels. The circuit selectively activates appropriate current paths based on operating conditions, thereby changing the compensation current parameter to match actual leakage requirements without consistently consuming excessive power.
2Power
If high power transistors are used to handle high current, then power handling capability is improved, but current leakage increases with temperature
Solution Approach 1:
The patent converts the harmful leakage current into a useful signal by using it as the reference for the compensation circuit. The leakage current that would otherwise be wasted is mirrored and used to generate an equal and opposite compensation current, thereby eliminating its harmful effect while utilizing the leakage itself as the control reference.
Solution Approach 2:
The patent implements a feedback mechanism where the leakage current from the high power transistor is continuously monitored and used to control the compensation current. The compensation circuit adjusts its output based on the actual leakage condition, creating a closed-loop system that automatically counteracts leakage effects.
3Reliability
If compensation current is increased to counteract leakage, then leakage compensation effectiveness is improved, but circuit efficiency decreases due to excessive current consumption
Solution Approach 1:
The patent provides multiple compensation current paths with different current magnitudes that can be dynamically selected based on operating conditions. This allows the circuit to use higher compensation current only when necessary (improving reliability) while using lower current during normal operation (maintaining efficiency).
Solution Approach 2:
The patent implements partial compensation rather than always providing full compensation. By offering multiple current levels, the circuit applies only the necessary amount of compensation current to counteract actual leakage, avoiding the excessive action that would reduce efficiency while still achieving sufficient compensation when needed.
Data Source
AI summary
A current leakage limit circuit connected to a circuit with current leakage and a leakage compensation circuit includes a first current mirror with a first transistor and a second transistor and a current source connected to the first transistor. The second transistor is connected between the circuit and the leakage compensation circuit and limits a compensation current flowing between the circuit and the leakage compensation circuit. The current flowing from the current source through the first transistor limits the current flowing through the second transistor.