Triangle Waveform Generator for Multi-Parameter PWM Control
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Solution Overview
Problem
Current triangle waveform generators in pulse width modulation amplifiers cannot concurrently control wave amplitude, frequency, symmetry, and phase, limiting their ability to accurately modulate audio signals and resulting in suboptimal audio quality.
Innovation Solution
A triangle waveform generator comprising a capacitive element, a regulator, and a control circuit that generates control signals responsive to the amplitude, frequency, phase, and symmetry of a reference waveform, allowing precise control over the triangle wave generation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage controlled oscillators are used to generate triangle waveforms, then the waveform can be phase locked to a reference frequency, but the system cannot concurrently control wave amplitude, frequency, symmetry and phase
Solution Approach 1:
The control system is divided into separate functional blocks: a phase-locked loop section for frequency control and a separate amplitude control section with adjustable gain. This segmentation allows the phase-locking function to maintain frequency accuracy while the amplitude control independently adjusts waveform amplitude, resolving the contradiction between reliable phase locking and versatile parameter control.
Solution Approach 2:
The invention introduces dynamically adjustable parameters including amplitude control voltage and gain adjustment. The amplitude control voltage can vary the triangle waveform amplitude independently of frequency, and the gain adjustment provides additional dynamic control capability. This dynamic control architecture enables concurrent control of multiple waveform parameters while maintaining phase-locking reliability.
2Device complexity
If conventional triangle waveform generators are used, then the circuit structure is relatively simple, but the control precision over multiple waveform parameters is insufficient
Solution Approach 1:
The invention introduces an intermediary amplitude control voltage that mediates between the phase-locked loop and the triangle waveform generation. This intermediate control signal allows precise adjustment of waveform amplitude without disrupting the phase-locking mechanism, achieving high control precision for multiple parameters while adding only moderate circuit complexity through the inclusion of operational amplifiers and control voltage inputs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous control of wave amplitude, frequency, symmetry, and phase, enhancing the accuracy and quality of the triangle waveform, thereby improving the modulation process and reducing signal corruption from switching noise crosstalk.
Implementation Method 1
a capacitive element, a regulator, and a control circuit. The regulator is configured to charge the capacitive element in response to a first control signal and to discharge the capacitive element in response to a second control signal.
Data Source
AI summary
A triangle waveform generator is set forth that comprises a capacitive element, a regulator, and a control circuit. The regulator is configured to charge the capacitive element in responsive to a first control signal and to discharge the capacitive element in response to a second control signal. The control circuit is responsive to a reference waveform to generate the first and second control signals. In one example, the control circuit generates the first and second control signals in response to the amplitude, frequency, phase, and symmetry of the reference waveform.