Power Converter Negative Current Control for Load Transitions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power converters fail to adjust negative current flowing through an inductor when a load transitions from a super light load to a medium or heavy load, leading to unnecessary power consumption and inadequate power supply.
Innovation Solution
A power converter with a negative current control mechanism that includes a high-side switch, low-side switch, error amplifying circuit, comparator, switch control circuit, and compensation trigger circuit, which adjusts the switching state of the switches to reduce negative current and maintain a constant current through the inductor during load transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the negative current flowing through the inductor is maintained at a constant value in conventional power converters, then the circuit structure is simple, but unnecessary power consumption occurs and insufficient power is supplied when the load transitions from super light load to medium or heavy load
Solution Approach 1:
The patent implements dynamic adjustment of the negative current through the inductor based on load conditions. The control circuit monitors the load state and dynamically modifies the current magnitude, transitioning from a constant current approach to a variable current approach that adapts to changing power requirements, thereby resolving the contradiction between maintaining simple circuit structure and achieving adaptive power supply
Solution Approach 2:
The patent changes the current parameter flowing through the inductor based on load transitions. By adjusting the current magnitude from a fixed constant value to a variable value that responds to load conditions, the system optimizes power consumption while ensuring sufficient power delivery during load transitions from super light to medium or heavy load states
2Productivity
If the switching state of high-side and low-side switches is changed to adjust inductor current during load transitions, then power supply capability is improved, but device complexity increases due to additional control circuits
Solution Approach 1:
The control circuit is designed to perform multiple functions: it monitors load conditions, determines transition states, adjusts switching patterns, and regulates inductor current. By consolidating these functions into a single multi-functional control unit rather than separate dedicated circuits for each function, the patent achieves improved power supply capability while minimizing the increase in device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the control circuit continuously monitors the actual load conditions and the state of the inductor current, then adjusts the switching states of the high-side and low-side switches accordingly. This closed-loop feedback approach enables automatic adaptation to load changes without requiring complex external control systems, thereby improving power supply capability while keeping the control circuit architecture manageable
Data Source
AI summary
A power converter having a negative current control mechanism is provided. The power converter includes an error amplifying circuit, a first comparator, a switch control circuit, a compensation trigger circuit and a compensation current supplying circuit. The error amplifying circuit multiplies a difference between a voltage of a second terminal of an inductor and a reference voltage by a gain to output a first error amplified signal. The first comparator compares a voltage of a first terminal of the inductor with a voltage of the resistor connected to a low-side switch to output a comparison signal. The switch control circuit controls a high-side switch and the low-side switch according to the comparison signal. The compensation trigger circuit, according to the comparison signal, determines whether to trigger the compensation current supplying circuit to supply a compensation current to the resistor according to the first error amplified signal.