Power Converter Load Transient Response Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Switching power converters face challenges in rapidly regulating output voltage when the load changes, leading to significant voltage drops during increased current demands, necessitating improved load transient response performance.

Innovation Solution

A power converter system incorporating a load transient response control module that includes a switch module, pulse width modulation module, clock generation module, and logic control module to detect output voltage deviations, generate control signals, and adjust switching to maintain the output voltage within desired limits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the load current increases rapidly, then the power delivered to the load increases, but the output voltage drops significantly

Engineering Contradiction:

Improvepower delivered to loadVSAvoidoutput voltage stability

Core Design Contradiction:

PowerVSStability of the object's composition

Solution Approach 1:

The patent detects voltage deviation in advance and generates a load response control signal before the voltage drop becomes severe. When the deviation exceeds a threshold, the system preliminarily adjusts the switching duty cycle to prevent significant voltage collapse, rather than reacting after the drop occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the output voltage is continuously monitored, and the detected deviation is fed back to adjust the switching control. The load response control module uses the voltage deviation feedback to dynamically modify the switching duty cycle, creating a closed-loop control system that stabilizes output voltage during load transients.

Inventive Principle:

Principle #23Feedback

2Speed

If the switching frequency increases to respond faster to load changes, then the transient response speed improves, but the clock signal timing becomes inadequate

Engineering Contradiction:

Improvetransient response speedVSAvoidclock signal timing

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent dynamically adjusts the switching duty cycle based on real-time voltage deviation rather than using a fixed high-frequency switching scheme. The load response control signal modifies the duty cycle proportionally to the detected deviation, allowing the switching frequency to adapt to the severity of the load transient rather than operating at maximum frequency continuously.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the switching duty cycle parameter in response to detected voltage deviation. When deviation exceeds the threshold, the duty cycle is increased to deliver more power and restore voltage; when deviation is within acceptable range, the duty cycle returns to normal. This parameter adjustment resolves the timing conflict by modulating effective switching rather than increasing frequency.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9837899B2Power converter with improved load transient response and associated control method

Publication Date: 2017.12.05 CHENGDU MONOLITHIC POWER SYST

AI summary

A power converter including a load transient response control module and associated method for controller the power converter. The load transient response control module detects a deviation of an output voltage of the power converter from a desired value of the output voltage and compares the deviation with a first threshold to provide a load response control signal indicating whether load transient change occurs. If the deviation is lower than the first threshold, a clock signal of the power converter is reset and a main switch of the power converter is maintained on during the period when the deviation is lower than the first threshold.