PWM Algorithm Maintaining Flat Voltage During Current Transients
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pulse width modulation algorithms fail to maintain maximally flat voltage during current transients across a broad range of plant component values and magnitudes of change, leading to voltage instability in semiconductor cores and other power supply domains.
Innovation Solution
A novel pulse width modulation algorithm that extends the sequence to maintain maximally flat voltage in second-order or higher-order systems by introducing coefficients n0 and AIerr(m) to compensate for extreme current transients, allowing for optimal power savings and minimal heat dissipation in switch mode DC-to-DC converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pulse width modulation algorithms are used, then the system is simple to implement, but voltage instability occurs during current transients
Solution Approach 1:
The patent applies preliminary action by calculating and storing optimal pulse width modulation sequences in advance for various current transient conditions. The lookup table contains pre-computed PWM sequences that are selected based on the detected transient condition, eliminating the need for complex real-time calculations during operation while maintaining voltage stability.
Solution Approach 2:
The patent introduces a lookup table as an intermediary between the control input and the PWM generator. This lookup table stores pre-computed PWM sequences that map transient conditions to optimal control actions, serving as a mediator that translates simple transient detection into complex voltage stabilization without requiring complex real-time algorithms.
2Adaptability or versatility
If the pulse width modulation sequence is extended to cover broader ranges, then adaptability to different transient conditions improves, but the algorithm complexity increases
Solution Approach 1:
The patent extends adaptability by pre-calculating and storing PWM sequences for a wide range of transient conditions in the lookup table during the design phase. This allows the system to handle diverse transient scenarios without increasing runtime computational complexity, as all adaptive responses are prepared in advance.
Solution Approach 2:
The patent achieves extended adaptability by organizing the lookup table to cover varying parameters such as different transient magnitudes, directions, and system operating points. By pre-computing sequences for different parameter combinations, the system adapts to broader conditions while maintaining simple runtime operation through table lookup.
3Measurement precision
If real-time calculation of PWM sequences is performed, then response accuracy improves, but processing time increases
Solution Approach 1:
The patent eliminates real-time calculation overhead by pre-computing all necessary PWM sequences and storing them in the lookup table. During operation, the system simply retrieves the appropriate pre-calculated sequence based on the detected transient condition, achieving both high precision and fast response without real-time computational delay.
Solution Approach 2:
The patent uses copying by storing pre-computed PWM sequences in the lookup table that represent optimal control actions for various conditions. Instead of recalculating these sequences in real-time, the system copies the appropriate pre-computed sequence from the table, achieving accurate voltage regulation with minimal processing time.
Data Source
AI summary
A digital circuit implementing pulse width modulation controls power delivered in what one can model as a second order or higher order system. An exemplary control plant could embody a step-down switch mode power supply providing a precise sequence of voltages or currents to any of a variety of loads such as the core voltage of a semiconductor unique compared to its input/output ring voltage. One of several algorithms produce a specific predetermined sequence of pulses of varying width such that the voltage maintains maximally flat characteristics while the current delivered to the load from the system plant varies within a range bounded only by inductive element continuous conduction at the low power extreme and non-saturation of the inductor core at the high power extreme. The specific pulse width modulation sequence controls a plant such that the voltage maintains maximally flat characteristics in one embodiment without a feed-forward or feedback loop physically embodied in the control system thereby reducing the parts cost or control semiconductor production yield cost while enhancing noise immunity and long term reliability of the control system. Several specific algorithms maintain maximally flat voltage despite extreme load variations therewith control plant element parameters otherwise exacerbating excessive voltage fluctuation during the given current transients.