Location-Based Switching Timing Control for Multi-Inverter Noise
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Solution Overview
Problem
The limited number of available carrier frequencies in multi-axis motor servo control systems leads to increased electromagnetic noise when the number of inverters exceeds the maximum, necessitating the use of the same carrier frequency by multiple inverters, which enhances noise interference.
Innovation Solution
An electronic apparatus with a central control device that generates distinct control parameters for switching control devices based on their location and distance, preventing electromagnetic noise enhancement by adjusting switching timings and carrier frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of inverters exceeds the maximum number of available carrier frequencies, then the same carrier frequency must be reused by multiple inverters, but this causes electromagnetic noise to increase
Solution Approach 1:
The patent changes the timing parameters (switching phases and duty cycles) of inverters that share the same carrier frequency. By introducing temporal parameter variations through location-based control, the system allows multiple inverters to operate at identical frequencies without constructive noise interference, thus resolving the contradiction between increasing inverter quantity and controlling electromagnetic noise.
2Object-generated harmful factors
If distinct carrier frequencies are assigned to multiple inverters to suppress switching noise, then electromagnetic noise is reduced, but the limited number of available carrier frequencies restricts the number of inverters that can be operated
Solution Approach 1:
Instead of changing carrier frequencies, the patent changes other switching parameters (phase timing and duty cycle) based on inverter location. This allows the system to maintain distinct switching patterns without requiring distinct carrier frequencies, thereby enabling more inverters to operate within the limited frequency spectrum while still suppressing electromagnetic noise.
Solution Approach 2:
The patent introduces a new control dimension (spatial location) to manage noise interference. By incorporating location information into the control strategy, the system can differentiate between inverters in space rather than requiring frequency differentiation, thus expanding the system capacity beyond the limited number of available carrier frequencies.
3Adaptability or versatility
If the same carrier frequency is used by multiple inverters, then the number of available frequencies is maximized for system expansion, but electromagnetic noise enhancement occurs
Solution Approach 1:
The patent enables system expandability by allowing multiple inverters to share carrier frequencies while introducing location-based timing parameter variations. This approach maintains frequency resource efficiency (maximizing system expandability) while controlling electromagnetic noise through temporal parameter differentiation, thus resolving the contradiction between adaptability and noise control.
Data Source
AI summary
An electronic apparatus includes processing circuitry configured to generate first control information about timing with which a first switching control device performs switching control and second control information about timing with which a second switching control device performs switching control based on location information on the first switching control device and location information on the second switching control device.