Digital Power Supply PWM Control for Stable Output Regulation
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Solution Overview
Problem
Existing digital power supply systems face challenges in efficiently controlling output voltage and current to meet desired characteristics, particularly in adapting to varying input signals and load conditions, which can lead to inefficiencies and instability.
Innovation Solution
A digital control system incorporating a digital signal processor (DSP) that receives feedback from a power transformation circuit, adjusts the power transformation circuit's operation, and communicates with a workstation for configuration and diagnostics, using pulse width modulation and closed-loop control to maintain desired output signals while minimizing overshoot and undershoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a digital control system is used to regulate output voltage and current, then the precision of output characteristics is improved, but the system complexity increases
Solution Approach 1:
The patent implements a feedback control system where the digital signal processor continuously monitors the output voltage and current, compares them against reference values, and adjusts the power transformation circuit accordingly. This closed-loop feedback mechanism ensures precise regulation of output characteristics while managing system complexity through systematic control architecture.
Solution Approach 2:
The patent replaces traditional analog control mechanisms with a digital control system using a digital signal processor. This substitution enables more precise control algorithms, better stability, and enhanced regulation precision while providing flexibility in adjusting control parameters through software rather than hardware modifications.
2Manufacturing precision
If feedback control is implemented to meet desired output characteristics, then the output precision is improved, but the response time may be delayed due to processing
Solution Approach 1:
The digital signal processor implements periodic sampling and control updates at optimized intervals. By using pulse width modulation with carefully selected switching frequencies, the system achieves precise output regulation while maintaining fast response times. The periodic control action allows the system to process multiple parameters efficiently within each control cycle.
Solution Approach 2:
The system pre-calculates control parameters and maintains ready-state buffers for control algorithms. When disturbances or load changes are detected, the pre-prepared control responses can be quickly applied, reducing the effective response time. This preliminary preparation of control actions minimizes processing delays while maintaining precision.
3Measurement precision
If digital circuitry is used to complete the feedback loop, then the control precision is improved, but the device complexity increases
Solution Approach 1:
The digital signal processor is designed to perform multiple functions including analog-to-digital conversion, digital filtering, control algorithm execution, and communication interfacing. This multi-functional approach consolidates what could be separate complex circuits into a single integrated processor, reducing overall system complexity while maintaining high measurement and control precision.
Solution Approach 2:
The system uses programmable parameters and configurable control algorithms that can be adjusted through software rather than hardware changes. This allows the digital circuitry to adapt to different control requirements without requiring complex reconfiguration circuits, simplifying the overall device architecture while maintaining flexibility and precision.
Data Source
AI summary
Methods and apparatus to control a digital power supply are disclosed. An example method includes calculating a duty cycle of a pulse width modulated signal to control an output of a digital power supply, initializing an output of a counter that forms a pulse width modulator to increment by a first increment up to a counter maximum value for a first period and to decrement by the first increment for a second period, dividing the duty cycle by a constant to determine a multiple of the duty cycle to apply to each power stage of the power supply, calculating a first threshold percent by subtracting the multiple of the duty cycle from one hundred percent, setting a first threshold to be the first threshold percent multiplied by the counter maximum value, and controlling the power factor controller based on the first threshold.