Switching Power Supply Dynamic Slope Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional switching power supplies face challenges in optimizing responsiveness and stability due to fixed slope voltages and current feedback gains, which vary with usage situations such as input voltage, output voltage, switching frequency, load current, and temperature.
Innovation Solution
A switching power supply design that dynamically adjusts the slopes of voltage and current feedback loops by using a second voltage generating circuit that combines first and second slope voltages based on output current, with adjustable coefficients, and a digital signal processing circuit that sets the pulse width modulation signal duty cycle based on these slopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed slope voltages and current feedback gains are used in conventional switching power supplies, then the circuit structure remains simple, but the responsiveness and stability cannot be optimized for varying usage situations
Solution Approach 1:
The patent implements dynamic adjustment of slope voltages and current feedback gains based on operating conditions. The control circuit modifies these parameters in real-time according to usage situations (input voltage, output voltage, switching frequency, load current, temperature), transforming the fixed-parameter system into a dynamic one that adapts to varying conditions, thereby resolving the contradiction between adaptability and complexity
Solution Approach 2:
The patent changes key electrical parameters (slope voltages and current feedback gains) based on operating conditions. By adjusting these parameters dynamically rather than keeping them fixed, the system achieves optimized responsiveness and stability across different usage situations while managing the complexity through systematic parameter control
2Adaptability or versatility
If the slope of the first slope voltage and the second slope voltage are fixed, then the control circuit is simple to implement, but the power supply cannot optimize performance across different input voltages, output voltages, switching frequencies, load currents, and temperatures
Solution Approach 1:
The control circuit dynamically adjusts slope voltages and current feedback gains based on real-time operating conditions including input voltage, output voltage, switching frequency, load current, and temperature. This dynamic adaptation enables performance optimization across varying usage situations while maintaining systematic control
Solution Approach 2:
The patent employs feedback mechanisms where the control circuit monitors operating conditions and adjusts slope voltages and current feedback gains accordingly. This closed-loop control enables the system to automatically optimize performance based on actual usage situations, balancing adaptability with controlled implementation
Data Source
AI summary
A switching power supply includes: a switching output circuit generating an output voltage from an input voltage according to ON/OFF control of an output transistor by a pulse width modulation (PWM) signal; a first voltage generating circuit generating a first voltage based on a difference between the output voltage and a predetermined reference voltage; a second voltage generating circuit generating a triangular second voltage; a comparing circuit generating a comparison signal by comparing the first voltage and the second voltage; a clock oscillating circuit generating a clock signal; and a logic circuit generating a PWM signal in response to the clock signal and the comparison signal, wherein the second voltage generating circuit generates the second voltage by adding a first slope voltage having a first slope and a second slope voltage having a second slope according to current flown through the switching output circuit.