Adaptive Bleeder Circuit for Voltage Regulator Stability
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Solution Overview
Problem
Conventional integrated circuit voltage regulators experience increased power consumption due to a fixed leakage current path, which is always active and can consume up to 10% more power, making it challenging to maintain stability across various process, voltage, and temperature (PVT) conditions.
Innovation Solution
An adaptive bleeder circuit is introduced, which includes a switch and a control circuit that selectively activates a leakage current path only when the load current falls below a predetermined threshold, using current sensing and voltage comparison circuitry to control the switch, thereby minimizing power consumption and ensuring stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed leakage current path (resistor) is always active to ensure stability across PVT variations, then the voltage regulator maintains stability, but power consumption increases by up to 10% or more
Solution Approach 1:
The patent applies the Dynamics principle by transforming the static, always-active resistor into a dynamic, controllable current path. A switch (transistor 202) is introduced to dynamically enable or disable the leakage current path based on operating conditions. The control circuit monitors the output current and activates the switch only when the current falls below a threshold, making the stability mechanism adaptive rather than fixed, thus reducing unnecessary power consumption while maintaining stability when needed.
2Reliability
If the leakage current path is always active to maintain stability, then the feedback loop remains stable across worst-case PVT variations, but the overall power consumption of the voltage regulator increases
Solution Approach 1:
The patent applies the Parameter changes principle by dynamically adjusting the resistance parameter of the leakage current path. When the switch is off, the resistance is effectively infinite (no leakage current). When the switch is on, the resistance becomes the value of resistor 212, providing the necessary leakage current for stability. This dynamic parameter adjustment allows the system to optimize between stability and power consumption based on real-time operating conditions.
Data Source
AI summary
An integrated circuit with voltage regulator circuitry is provided. The voltage regulator circuitry may include an adaptive bleeder circuit. The adaptive bleeder circuit may include one or more switchable current leaker paths and an associated bleeder control circuit having current sensing circuitry and voltage comparison circuitry. The current sensing circuitry may monitor the amount of current that is being delivered to a load circuit, whereas the voltage comparison circuitry may output control signals that selectively activate one or more of the current leaker paths depending on the monitored current values. Adaptive bleeder circuit configured in this way can help maintain stability of the voltage regulator while minimizing dynamic power consumption.