Piezo Drive Wave Generation Circuit Serial Bus Control
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Solution Overview
Problem
Conventional drive wave generation circuits for piezo-actuators require changes in hardware when altering the duty ratio and timing of voltage waveforms, which is inefficient and limits flexibility in controlling the speed of back-and-forth movement of the drive shaft.
Innovation Solution
A drive wave generation circuit that uses a serial bus to control the generation of drive waves by storing drive data in a register, allowing for variable duty ratios and timings without the need for changing hardware, utilizing a basic waveform generation circuit, unit counter, output enable circuit, and output gate to produce the required waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the duty ratio and timing of basic waveform are fixed in the drive circuit, then the device complexity is reduced, but the adaptability deteriorates because the drive circuit needs to be changed when a piezo-element is changed
Solution Approach 1:
The patent applies dynamics by making the duty ratio and timing parameters variable rather than fixed. The drive circuit uses a register to store setting data that can be changed to adapt to different piezo-elements, allowing the waveform generation to dynamically adjust to various application requirements while maintaining the same hardware circuit.
Solution Approach 2:
The patent changes the parameters of the drive waveform (duty ratio and timing) by storing adjustable setting data in a register. This allows the basic waveform generation circuit to produce different drive waves with varying duty ratios and timings by simply changing the stored parameter values, thereby adapting to different piezo-elements without modifying the hardware circuit.
2Adaptability or versatility
If data transmission utilizing a bus is used to ensure variable duty ratio and timing, then the adaptability is improved, but the device complexity increases due to the need for data transfer control
Solution Approach 1:
The patent introduces a register as an intermediary component that stores setting data for duty ratio and timing. This register acts as a buffer between the control system and the waveform generation circuit, simplifying the data transfer process by providing a dedicated storage location that the waveform generation circuit can directly access without complex control logic.
Solution Approach 2:
The patent implements preliminary action by pre-storing the setting data for duty ratio and timing in a register before waveform generation begins. This allows the waveform generation circuit to quickly access and use the predetermined parameters without requiring complex real-time calculations or control during the actual waveform generation process.
Data Source
AI summary
To generate a drive wave for driving a piezo-actuator. Drive data concerning the number of drive waves supplied through a serial bus is stored in a drive data storage unit. A comparing circuit detects whether or not the number of drive waves have been generated, the number being specified by the drive data, and the drive wave keeps being generated until such detection is made.