LDO Regulator Dynamic Bandwidth Adjustment for Voltage Stability
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Solution Overview
Problem
Low dropout regulators (LDO) in power supplies for electronic systems, such as automobile electronics, face challenges in stabilizing output voltage due to rapid load changes, which can cause voltage surges and potentially damage circuits, necessitating a protection mechanism to maintain voltage stability.
Innovation Solution
A regulator design incorporating a driver circuit, an amplifier circuit, a first current source circuit, and a second current source circuit, where the amplifier circuit controls the driver circuit based on the sum of currents from both source circuits to adjust the output voltage, increasing response speed when deviations occur, thereby stabilizing the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the LDO circuit operates with standard amplifier bandwidth, then power consumption is reduced, but response speed to load changes is insufficient causing voltage surge
Solution Approach 1:
The patent implements dynamic bandwidth adjustment by switching between a first current source circuit and a second current source circuit connected to the amplifier. When load changes are detected, the circuit dynamically switches to provide higher current to the amplifier, increasing bandwidth and response speed temporarily. This dynamic adjustment allows the system to achieve fast response only when needed, rather than maintaining high bandwidth continuously, thus resolving the contradiction between response speed and power consumption.
2Reliability
If the amplifier circuit bandwidth is increased to improve response speed, then voltage stability improves, but power consumption increases
Solution Approach 1:
The patent employs periodic or conditional switching between different current source circuits based on load change detection. The circuit monitors the operating conditions and periodically switches between the first current source circuit (lower power) and the second current source circuit (higher power for improved stability) only when voltage deviations occur. This conditional periodic action ensures voltage stability is maintained during critical moments while minimizing power consumption during normal operation.
3Reliability
If a protection mechanism is added to stabilize output voltage during load changes, then circuit protection is improved, but device complexity increases
Solution Approach 1:
The patent merges the protection mechanism with the existing amplifier circuit by integrating the first and second current source circuits directly into the amplifier's input stage. Rather than adding a separate protection circuit, the design combines voltage stabilization functionality with the existing power amplification path. This merging approach provides circuit protection and voltage stabilization while minimizing additional complexity, as the current source circuits share infrastructure with the amplifier rather than operating as independent protection modules.
Data Source
AI summary
A regulator includes a driver circuit, an amplifier circuit, a first current source circuit and a second current source circuit. The driver circuit is configured to receive an input voltage and provide an output voltage. The first current source circuit is configured to provide a first current to the amplifier circuit. The second current source circuit is configured to provide a second current to the amplifier circuit according to the output voltage if the output voltage deviates from a predetermined voltage. The amplifier circuit is configured to control the driver circuit according to the output voltage and a third current, in which the third current is a sum of the first current and the second current.