Switching Power Supply Feedback Resistor Dynamics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Switching power supply devices face challenges in achieving low consumption of power, low abnormal noise, and low output ripple across an entire input voltage range, particularly during burst operations, due to the limitations of existing burst mode control systems that result in high burst power and frequency, leading to audible noise issues.
Innovation Solution
A switching power supply device with a feedback terminal and a comparator that determines the load state, using input voltage detection and switch elements to adjust the resistance value of pull-up resistors, and optionally switching the reference voltage based on input voltage magnitude, to balance burst power, frequency, and output ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If burst mode control is used to decrease switching operations during light load, then power consumption is reduced, but abnormal noise and output ripple increase
Solution Approach 1:
The patent applies dynamics by making the pull-up resistor value switchable based on input voltage conditions. The resistor value is dynamically adjusted: a first resistor value is used when input voltage is below a threshold, and a second resistor value is used when input voltage is at or above the threshold. This dynamic adjustment optimizes the balance between power consumption and abnormal noise across different operating conditions.
Solution Approach 2:
The patent changes the resistance parameter of the pull-up resistor based on input voltage magnitude. By switching between two distinct resistor values (first and second resistor values) depending on whether the input voltage is below or above a threshold, the system optimizes performance parameters including power consumption, burst frequency, and abnormal noise levels for different input voltage ranges.
2Use of energy by moving object
If burst mode control is used to decrease switching operations during light load, then power consumption is reduced, but output ripple increases
Solution Approach 1:
The patent applies dynamics by making the pull-up resistor value switchable based on input voltage conditions. The resistor value is dynamically adjusted: a first resistor value is used when input voltage is below a threshold, and a second resistor value is used when input voltage is at or above the threshold. This dynamic adjustment optimizes the balance between power consumption and output ripple across different operating conditions.
Solution Approach 2:
The patent changes the resistance parameter of the pull-up resistor based on input voltage magnitude. By switching between two distinct resistor values (first and second resistor values) depending on whether the input voltage is below or above a threshold, the system optimizes performance parameters including power consumption, burst frequency, and output ripple levels for different input voltage ranges.
3Reliability
If high burst power and frequency are used during light load, then switching operations are maintained, but power consumption and noise increase
Solution Approach 1:
The patent changes the resistance parameter of the pull-up resistor based on input voltage magnitude. By switching between two distinct resistor values (first and second resistor values) depending on whether the input voltage is below or above a threshold, the system optimizes performance parameters including power consumption, burst frequency, and output ripple levels for different input voltage ranges.
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 configuration allows for balanced burst power, frequency, and output ripple across the input voltage range, reducing power consumption, abnormal noise, and output ripple, thereby enhancing operational efficiency and noise reduction.
Implementation Method 1
a comparator which compares the terminal voltage of the feedback terminal with a reference voltage and determines whether the load state is a normal load state or a light load state
Implementation Method 2
a first switch element which switches a resistance value of the pull-up resistor according to the change of the load state, and a second switch element which switches the resistance value of the pull-up resistor according to whether the input voltage is high or low
Data Source
AI summary
A switching power supply device that includes a feedback terminal to which a feedback signal according to a load state is input, and a comparator which compares a terminal voltage of the feedback terminal with a reference voltage and determines whether the load state is a normal load state or a light load state. The switching power supply device also includes pull-up resistors which are connected to the feedback terminal, a switch element which switches resistance values of the pull-up resistors according to the change of the load state, and a switch element which switches the resistance values of the pull-up resistors according to whether the input voltage is high or low.