Digitally Variable Slope Compensation Circuit for Power Supply Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply circuits face challenges in providing a steady and consistent power output with adjustable voltage inputs, leading to voltage distortion, oscillations, and instability, which can result in safety hazards and inefficiencies, particularly in medical and security applications.
Innovation Solution
A digitally compensated circuit with a digitally variable slope controller and adjustable voltage generator, using a slope compensation algorithm to adjust the charge time of an inductor, reduces voltage distortion and generates a stable output power without resistors or capacitors, incorporating a comparator and adjustable pulse width modulator to manage input voltage variability and prevent overcurrent conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional power supply circuits are used with adjustable voltage inputs, then voltage regulation flexibility is improved, but voltage distortion and oscillations increase
Solution Approach 1:
The patent implements dynamic slope compensation that automatically adjusts the compensation amount based on the duty cycle of the switching regulator. As the duty cycle changes with input voltage variations, the slope compensation dynamically adapts to maintain optimal stability, resolving the contradiction between voltage regulation flexibility and voltage stability.
Solution Approach 2:
The patent changes the compensation parameter (slope compensation amount) based on operating conditions (duty cycle). By varying the compensation parameter dynamically rather than using fixed compensation, the system maintains stability across different input voltages while preserving regulation flexibility.
2Device complexity
If fixed slope compensation is used in switching regulators, then circuit simplicity is improved, but performance across varying input voltages deteriorates
Solution Approach 1:
The patent transitions from fixed slope compensation to dynamic slope compensation where the compensation amount is automatically adjusted based on the duty cycle. This dynamic approach maintains performance consistency across varying input voltages without significantly increasing circuit complexity, as it utilizes existing control signals.
Solution Approach 2:
The patent implements feedback mechanisms where the duty cycle information is fed back to adjust the slope compensation amount. This feedback loop ensures that the compensation adapts to changing operating conditions, maintaining reliable performance across different input voltages while keeping the control logic integrated within the existing regulator architecture.
3Speed
If analog compensation circuits are used, then response speed is improved, but noise and distortion increase
Solution Approach 1:
The patent replaces analog compensation circuits with digital slope compensation implemented through digital signal processing. The digital approach computes compensation amounts based on duty cycle feedback, providing fast response speeds comparable to analog circuits while eliminating the noise and distortion inherent in analog components.
Solution Approach 2:
The patent uses digital representation of the compensation signal, creating a digital copy of the required compensation amount based on duty cycle measurements. This digital copying approach maintains the fast response characteristics of analog systems while avoiding the noise and distortion problems of physical analog components.
Data Source
AI summary
A digitally compensated circuit for a power supply having a plurality of integrated circuits. The plurality of integrated circuits has a digitally variable slope controller to adjust charge time of an inductor and voltage distortion and an adjustable voltage generator, which generates a modified voltage set point. The digitally compensated circuit has a comparator, which compares the modified voltage set point to a first feedback and turns off a comparator output signal when first feedback approaches or exceeds the modified voltage set point. An adjustable pulse width modulator generator produces an output voltage. A current monitor receives output voltage and provides a second feedback, which is transferred to the plurality of integrated circuits. An inductor receives output voltage and generates variable output power for a load, utilizing the digitally variable slope controller to reduce oscillation, system disturbances, and subharmonic oscillations over a dynamic voltage input range.