Adaptive Loop Gain Current Regulator for Power Supply Ripple Rejection
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Solution Overview
Problem
Existing power supply circuits, such as LED driver circuits, suffer from undesirable power supply ripple which current regulator circuitry struggles to effectively reject or filter, leading to inefficiencies in voltage and current regulation.
Innovation Solution
The implementation of adaptive loop gain circuitry in regulator circuits that includes a peak detector and error amplifier, which removes the DC component of the sensed output, multiplies the output ripple signal, and adjusts loop gain based on ripple magnitude to enhance ripple rejection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional fixed loop gain regulation is used, then circuit simplicity is maintained, but ripple rejection performance is insufficient
Solution Approach 1:
The patent implements adaptive loop gain that dynamically adjusts the regulation strength based on the magnitude of power supply ripple. The loop gain is modulated by a ripple detection signal, allowing the regulator to strengthen its ripple rejection capability when ripple is detected while maintaining normal operation when ripple is absent. This resolves the contradiction by making the regulator adaptive rather than static.
Solution Approach 2:
The patent introduces a feedback mechanism where the output signal is monitored for ripple content, and this information is fed back to adjust the loop gain. The ripple detection circuit continuously monitors the output and modulates the loop gain accordingly, creating a closed-loop adaptive system that automatically optimizes ripple rejection performance based on actual ripple conditions.
2Object-affected harmful factors
If adaptive loop gain circuitry is added to improve ripple rejection, then power supply rejection improves by up to 15 dB, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated circuit blocks. The ripple detection, loop gain modulation, and error amplification functions are merged into a unified adaptive loop gain circuitry that works together as a cohesive system. This integration reduces the overall complexity compared to implementing separate independent circuits for each function.
Solution Approach 2:
The adaptive loop gain circuitry serves multiple purposes: it detects ripple, generates modulation signals, adjusts loop gain, and maintains normal regulation function. This multi-functionality reduces the need for separate dedicated circuits for each task, thereby managing complexity while achieving superior ripple rejection performance.
3Object-affected harmful factors
If loop gain is increased to reject ripple, then ripple attenuation improves, but stability may deteriorate
Solution Approach 1:
The patent uses dynamic loop gain adjustment rather than fixed high gain. The loop gain is modulated by the ripple detection signal, meaning high gain is applied only when ripple is present and detected, while normal operation uses standard gain levels. This dynamic adaptation maintains stability by avoiding continuously high gain that would cause oscillation.
Solution Approach 2:
The feedback mechanism monitors the actual ripple condition and adjusts loop gain accordingly. This closed-loop control ensures that high loop gain is only activated when needed for ripple rejection, preventing stability issues that would arise from permanently high gain settings. The feedback ensures the system remains stable under all operating conditions.
Data Source
AI summary
Regulator circuitry configured to manage power supply ripple using an adaptive loop gain that offers ripple rejection performance related to the ripple magnitude for a negative closed loop of the regulator circuitry. The power supply regulator circuitry of this disclosure includes an error amplifier in the closed loop and an adaptive loop gain circuitry. The adaptive loop gain circuit removes a DC component of the sensed output and feeds the sensed output, including the output ripple, to peak detector circuitry to obtain a Vpeak signal. The Vpeak signal output from the peak detector circuitry is a continuous signal that tracks the wave peak. The circuit arrangement multiplies the output of the error amplifier by the signal Vpeak resulting in improved power supply ripple rejection as the ripple amplitude increases. To avoid control signal with zero value during times that the peak-to-peak value of the sensed voltage.