Signal Generator Waveform Shaping for Low Noise Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing signal generators face challenges in reducing noise and switching loss when controlling electric loads and communication signals, particularly due to rapid current changes during energization and de-energization, which increase heat generation and manufacturing costs.
Innovation Solution
A signal generator with a current control element and signal forming means that generates control signals for a sine waveform current, ensuring smooth slope changes at rising and falling edges, reducing noise and switching loss by eliminating rapid variation points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the slope at rising edge and down edge of current waveform is reduced to lower noise level, then noise is reduced, but switching loss in switching device increases and heat generation increases
Solution Approach 1:
The patent applies curvature by transforming the linear slope edges of the current waveform into sinusoidal curved edges. The control signal is generated with sinusoidal rising and falling edges, which smoothly transition the current without abrupt changes. This curvature eliminates the rapid current variations that cause both noise and switching losses, resolving the contradiction between noise reduction and energy efficiency.
2Object-affected harmful factors
If the slope at rising edge and down edge is reduced to reduce noise, then noise level is reduced, but thermal resistance requirements increase and heat sink preparation is needed
Solution Approach 1:
By using sinusoidal waveforms for the control signal edges, the patent creates a curved transition instead of a linear one. This curvature in the rising and falling edges of the control signal ensures that current changes occur gradually, preventing sudden heat generation in the switching device while still achieving noise reduction.
3Object-affected harmful factors
If the current waveform slope is reduced to reduce noise, then noise is reduced, but device complexity increases due to additional heat management components
Solution Approach 1:
The patent employs sinusoidal curvature in the control signal waveform to achieve smooth current transitions. This approach reduces noise without requiring additional heat management components, thereby avoiding increased device complexity while maintaining effective noise suppression.
4Object-affected harmful factors
If the slope at rising edge and down edge is reduced to reduce noise in communication, then communication noise is reduced, but productivity decreases due to slower switching
Solution Approach 1:
The sinusoidal waveform provides curved transitions that are neither too abrupt nor too slow. The curvature allows the current to change gradually during switching, reducing communication noise while maintaining adequate switching speed for practical applications, thus balancing noise reduction with productivity requirements.
Data Source
AI summary
A signal generator includes: a current control element for controlling a current flowing through an electric load; and signal forming means for outputting a control signal to the current control element. The signal forming means generates the control signal in such a manner that the current flowing through the electric load has a rising edge and a down edge of a substantially sine waveform. The rising edge of the current is disposed at a timing when the current control element is switched on. The down edge of the current is disposed at a timing when the current control element is switched off.