Voltage Regulator Current Sensing Stability via Reference Resistance
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Solution Overview
Problem
Conventional switching voltage regulators face challenges in accurately regulating output voltage due to variability in the effective resistance of components like transistors, which affects current sensing and can lead to inefficiencies and instability in voltage conversion.
Innovation Solution
The implementation of a voltage regulator with a power switch and an output filter, where an adjustment device converts the current sensing voltage by replacing the current sensing resistance with a reference resistance, using a matching component with shared physical characteristics to minimize variability, and control circuitry adjusts the power switch based on the adjusted current sensing voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional current sensing resistance is used in voltage regulator, then device complexity is reduced, but measurement precision deteriorates due to resistance variability affecting current sensing accuracy
Solution Approach 1:
The patent creates a copy of the current sensing path using a matching component (second transistor) that replicates the electrical characteristics of the power switch transistor. This copy is used to generate a stable reference voltage that compensates for variations in the actual current sensing resistance, thereby maintaining measurement precision without requiring complex external calibration circuits.
Solution Approach 2:
The patent introduces an intermediary matching component (second transistor) that shares physical characteristics with the power switch transistor. This intermediary element acts as a mediator to transfer and stabilize the resistance characteristics, allowing the system to sense current accurately while compensating for resistance variability through the matched component's stable properties.
2Stability of the object's composition
If matching component with shared physical characteristics is used to replace current sensing resistance, then stability improves, but device complexity increases
Solution Approach 1:
The patent merges the matching component (second transistor) into the existing power switch structure, where both transistors share the same physical substrate and fabrication process. This integration allows the stability benefits of matched components to be achieved while minimizing additional complexity, as the matching component becomes part of the unified power switch assembly rather than a separate external element.
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
This approach stabilizes voltage regulation by reducing the impact of resistance variability, enhancing the accuracy and efficiency of current mode control, thereby protecting against excessive current delivery and improving overall regulator performance.
Implementation Method 1
A first voltage divider unit is coupled to sense a voltage corresponding to the matching component resistance and the reference current. The first voltage divider unit comprises a first voltage dividing component and a second voltage dividing component.
Implementation Method 2
Control circuitry is coupled between the adjustment device and the power switch input. The control circuitry is configured to control switching of the power switch responsive to the adjusted current sensing voltage.
Data Source
AI summary
The disclosed embodiments of voltage regulators incorporate a current mode control architecture. In one embodiment, a voltage regulator includes a power switch having an input and an output. The power switch is configured to provide a first voltage during a first conduction period and a second voltage during a second conduction period. An output filter is coupled between the power switch output and an output terminal to be coupled to a load. An adjustment device is coupled to sense a current sensing voltage corresponding to a current provided to the output filter. The adjustment device is configured to convert the current sensing voltage to an adjusted current sensing voltage, including replacing a current sensing resistance associated with the current sensing voltage with a reference resistance. Control circuitry includes a current sensing input coupled to the adjustment device to sense the adjusted current sensing voltage, and an output in communication with the power switch input. The control circuitry is configured to cause a transition of the power switch from the second conduction period to the first conduction period responsive to the adjusted current sensing voltage.