Voltage Regulator Inductor Detection for Buck-Linear Mode Switching
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Solution Overview
Problem
Voltage regulators used in microcontrollers and electronic devices often require specific configurations for buck or linear modes, which can be costly and inefficient, especially when the presence of an inductor is not explicitly specified.
Innovation Solution
A voltage regulator that can automatically detect the presence of an inductor using a detection circuit and switch between buck and linear regulation modes, allowing for flexible operation without explicit configuration, thereby reducing costs and size by utilizing shared components such as transistors and sensors across modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a voltage regulator is designed to support both buck and linear modes with separate control circuits, then functionality and adaptability are improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a single control circuit that can operate in multiple modes (buck and linear) by dynamically changing its configuration based on inductor detection. The same control circuitry performs different functions depending on whether an inductor is detected, eliminating the need for separate control circuits for each mode and reducing overall device complexity while maintaining full functionality
Solution Approach 2:
The control circuit is designed to be dynamically reconfigurable between buck and linear modes based on real-time inductor detection. The regulator automatically transitions between operating modes by adjusting control parameters and circuit connections, allowing a single static circuit to perform multiple dynamic functions without requiring separate dedicated circuits for each mode
2Reliability
If a buck voltage regulator is designed with full buck control circuitry, then buck mode performance is improved, but cost and complexity increase when linear mode is also needed
Solution Approach 1:
The control circuit is designed as a universal circuit that can reliably perform buck regulation when an inductor is detected while also being capable of linear regulation when no inductor is present. The same control elements (error amplifier, PWM generator, compensation circuitry) are used for both modes, reducing complexity while maintaining buck mode performance through proper mode-dependent control parameter adjustment
3Measurement precision
If explicit configuration pins or registers are added to specify regulator mode, then configuration precision is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The voltage regulator automatically detects the presence or absence of an inductor through its output circuit and self-configures the appropriate control mode without requiring external configuration pins, registers, or user intervention. The system serves itself by monitoring its own operating conditions and adapting its control strategy accordingly, eliminating the need for explicit configuration while ensuring correct operation
Solution Approach 2:
The regulator uses feedback from its output circuit to detect the presence of an inductor and automatically adjusts its control mode based on this feedback. The detection circuit monitors voltage and current characteristics at the output to determine whether an inductor is connected, and this feedback information is used to automatically configure the appropriate regulation mode without external input
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and cost-effective operation in both buck and linear modes, ensuring reliable voltage supply to microcontrollers without the need for explicit configuration, reducing complexity and enhancing adaptability in various applications.
Implementation Method 1
a detection circuit determines whether a regulator output of the voltage regulator resists a change in current driven to the regulator output
Data Source
AI summary
A voltage regulator is configurable to operate in a linear regulator mode or a buck regulator mode. To operate in the buck regulator mode, the voltage regulator is coupled to an inductor. To determine whether an inductor is coupled to voltage regulator, and thus whether the voltage regulator can be configured in the buck regulator mode, a detection circuit determines whether a regulator output of the voltage regulator resists a change in current driven to the regulator output.