Power Supply Controller Trigger Threshold Adjustment
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Solution Overview
Problem
Conventional switching power supply systems operating in discontinuous mode lack load-line voltage correction, leading to inefficient current supply and reduced switching frequency, which results in non-uniform load line voltage and increased output capacitance requirements.
Innovation Solution
Implementing a power supply controller that monitors inductor current and adjusts the trigger threshold value to maintain output voltage stability by activating the control switch when the output voltage falls below a certain threshold, utilizing a voltage adjustment value generated from the inductor current and load-line resistance, allowing for load-line voltage correction during discontinuous operational mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power supply operates in discontinuous mode without load-line voltage correction, then switching frequency is reduced and power conversion efficiency is improved, but output voltage becomes non-uniform and requires increased output capacitance
Solution Approach 1:
The patent implements a feedback mechanism that monitors the output voltage and inductor current, then adjusts the trigger threshold dynamically based on the load-line characteristics. The controller calculates a trigger threshold adjustment value proportional to the inductor current and adds it to the base trigger threshold, creating a closed-loop control system that maintains uniform output voltage while operating in discontinuous mode.
Solution Approach 2:
The patent changes the trigger threshold parameter dynamically based on operating conditions. Instead of using a fixed trigger threshold, the system adjusts the trigger threshold value proportionally to the inductor current magnitude, allowing the power supply to adapt to varying load conditions and maintain voltage uniformity across different operating points in discontinuous mode.
2Loss of energy
If conventional power supply operates in discontinuous mode with light load, then power conversion efficiency is improved, but output voltage drops below acceptable levels
Solution Approach 1:
The patent applies preliminary action by pre-calculating and adjusting the trigger threshold before the output voltage actually drops. The controller proactively modifies the trigger threshold based on the measured inductor current and load-line characteristics, preventing the output voltage from falling below acceptable levels rather than reacting after the drop occurs.
3Manufacturing precision
If conventional power supply uses analog current sense with external resistor network for load-line correction, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical/analog approach (external resistor network and analog current sense) with a digital implementation. The controller uses digital processing to calculate the trigger threshold adjustment based on inductor current measurements, eliminating the need for complex external analog correction circuits while maintaining or improving correction accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the number of output capacitors required and maintains high power conversion efficiency even at light loads, preventing output voltage from falling below acceptable levels, thus enhancing the power supply's performance and efficiency.
Implementation Method 1
the conventional power supply controller activates only a respective control switch to couple an inductor to a positive voltage source to increase an amount of current through the inductor to a load
Implementation Method 2
During the third switch state, an output capacitance of the power supply outputs current to power the load
Data Source
AI summary
A controller operates a power supply in a discontinuous mode. While in the discontinuous mode, a monitor resource in the controller monitors current supplied by an inductor resource in the power supply to produce an output voltage to power a load. An adjustment value generator produces an adjustment value based on a magnitude of the current supplied to the load by the inductor resource. According to one configuration, the adjustment value equals the average inductor current multiplied by the load-line resistance value of the power supply. The controller produces an adjusted trigger threshold value by reducing a trigger threshold value by the adjustment value generated by the adjustment value generator. The adjusted trigger threshold value specifies a reduced threshold voltage at which the power supply controller turns ON a control switch in the power supply to increase an amount of current supplied by the inductor resource to the load.