Boost Regulator Pulse Frequency Mode Constant Ripple
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Solution Overview
Problem
Conventional boost regulators in pulse frequency mode experience variable percentage ripple and frequency, leading to instability in output voltage regulation, particularly during light load conditions, which can affect the operation of sensitive components like memories and microprocessors.
Innovation Solution
A boost regulator with a pulse frequency mode that dynamically adjusts the current limit reference based on the input and output voltages, maintaining a substantially constant percentage ripple and frequency through the use of a current limit modulator and feedback mechanisms, ensuring stable operation across varying input and output voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a boost regulator operates in pulse frequency mode to deliver energy during light load conditions, then energy efficiency is improved, but the output voltage ripple percentage and repetition frequency become variable
Solution Approach 1:
The patent modifies the current limit reference parameter dynamically based on input and output voltage conditions. By adjusting this reference parameter in response to voltage changes, the system maintains a substantially constant percentage output ripple while operating in pulse frequency mode, thus resolving the contradiction between energy efficiency and output voltage stability
Solution Approach 2:
The patent implements a feedback mechanism that monitors input and output voltages and uses this information to modulate the current limit reference. This closed-loop control ensures that the output voltage ripple percentage remains substantially constant despite variations in operating conditions, while still benefiting from the energy efficiency of pulse frequency mode operation
2Adaptability or versatility
If a boost regulator operates in pulse frequency mode with variable repetition frequency, then adaptability to varying load conditions is improved, but stability of operation is reduced
Solution Approach 1:
The patent dynamically adjusts the current limit reference parameter based on real-time voltage measurements, enabling the system to adapt to varying load conditions while maintaining stable operation. This parameter modulation allows the regulator to respond to changing conditions without sacrificing operational stability
Solution Approach 2:
The feedback mechanism continuously monitors voltage conditions and adjusts the current limit reference accordingly, creating a self-regulating system that adapts to load variations while maintaining stable output. This closed-loop control provides both adaptability and reliability by responding to actual operating conditions
Data Source
AI summary
A method includes receiving an input voltage at a voltage regulator and generating an output voltage using the voltage regulator, which includes an inductor. The method also includes controlling a current through the inductor using a current limit reference and modulating the current limit reference based on the input voltage and the output voltage. Modulating the current limit reference could include modulating a reference current based on a product of first and second input currents. The first input current may be based on the output voltage, and the second input current may be based on a difference between the output and input voltages. The voltage regulator may operate in a pulse frequency mode associated with a repetition rate. The repetition rate and a percentage ripple associated with the output voltage may be substantially constant over variations in the input voltage and variations in the output voltage.