Switched-Mode Power Supply Simulation for Non-Linearity Compensation
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Solution Overview
Problem
Switching power amplifiers face non-linearities due to dead-time and voltage drops, which are challenging to compensate for in precision power applications like MRI and motion control, especially when using feed-forward control systems, as existing methods like look-up tables are limited in accuracy and memory resource utilization.
Innovation Solution
A switched-mode power supply apparatus with a control unit that simulates and predicts the average load voltage and current using in-the-loop simulation on an accelerated time scale, allowing for linear growth in circuit complexity and high accuracy, enabling effective compensation of non-linearities by selecting or interpolating timing settings for optimal switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a look-up table approach is used to compensate for non-linearities, then memory resources are utilized, but accuracy is limited and the number of state variables is restricted due to exponential growth
Solution Approach 1:
The patent transforms the compensation approach by changing from a static look-up table to a dynamic simulation-based prediction system. The control unit simulates circuit behavior for multiple timing settings and uses interpolation to find optimal compensation parameters, avoiding the exponential memory growth of comprehensive look-up tables while achieving higher accuracy through continuous adaptation to circuit state
Solution Approach 2:
The patent creates a virtual model (simulation) of the power supply circuit that replicates its behavior without requiring physical modification. This simulated model allows prediction of circuit response to timing variations, enabling accurate compensation without the memory overhead of storing all possible state combinations in a look-up table
2Measurement precision
If simulation is performed in real-time for all timing settings, then accuracy is improved, but processing time increases
Solution Approach 1:
The control unit performs simulation calculations for multiple timing settings in advance before the actual switching cycle begins. By predicting the average output voltage/current for various timing configurations ahead of time, the system can quickly select or interpolate the optimal timing setting without time-consuming calculations during critical switching operations
Solution Approach 2:
The patent implements a dynamic prediction system that adapts to changing circuit conditions. The simulation model is continuously updated with current circuit state information, and the prediction process dynamically adjusts based on load conditions, temperature, and other varying parameters, allowing accurate real-time compensation without fixed lookup tables
Data Source
AI summary
The present invention relates to a switched-mode power supply apparatus and a corresponding method. For an effective compensation of non-linearities caused by dead-time and voltage drops in the switching power amplifier of the apparatus, an apparatus is proposed comprising a switching power amplifier (14) for amplifying a signal supplied by an external signal source (11) and for supplying a load voltage and/or load current to a load (15), and a control unit (12; 12b) for controlling the switching of said switching power amplifier based on a timing setting, said control unit being adapted for simulating the behavior of the switching power amplifier by predicting the average load voltage and/or load current for at least two, in particular a plurality of, timing settings for a desired load voltage and/or load current based on state information about the present state of the switching power amplifier.