Piezoelectric Driving Control Circuit State Detection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing piezoelectric driving devices with multiple elements face complexity and miniaturization challenges due to the need for multiple potential difference detection units, making it difficult to efficiently detect the state of each element.

Innovation Solution

A control circuit that includes a signal generation unit for inputting a state inspection signal to multiple piezoelectric elements in parallel and a state detection unit that detects the state based on a current flowing through these elements, using integrated current values or effective current values to determine normal, short-circuit, or disconnection states, allowing for simplified and miniaturized configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple potential difference detection units are provided to detect states of multiple piezoelectric elements, then the state detection precision is improved, but the device complexity increases

Engineering Contradiction:

Improvestate detection precisionVSAvoidconfiguration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple piezoelectric elements connected in parallel share a common detection circuit. The detection unit measures the total potential difference across the parallel combination, which reflects the collective state of all elements. This merging approach allows state monitoring of multiple elements using a single detection unit, reducing device complexity while maintaining detection capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single detection unit serves multiple functions by detecting the state of all piezoelectric elements simultaneously through their parallel connection. The same circuit configuration can detect states of different numbers of elements by comparing against stored determination values, providing universal state monitoring without requiring element-specific detection circuits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If multiple potential difference detection units are provided to detect states of multiple piezoelectric elements, then the state detection precision is improved, but the device size increases

Engineering Contradiction:

Improvestate detection precisionVSAvoiddevice area

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If a single detection unit is used for multiple piezoelectric elements, then the device complexity is reduced, but the state detection precision may deteriorate

Engineering Contradiction:

Improveconfiguration complexityVSAvoidstate detection precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system uses feedback comparison between the measured potential difference and predetermined determination values stored in memory. The state determination unit continuously compares the detected value against reference values to accurately determine element states, ensuring detection precision is maintained even with a single detection unit serving multiple elements.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes the parameter of comparison by using multiple predetermined determination values that correspond to different element states. By comparing the measured potential difference against these varying reference parameters, the system can precisely distinguish between different states (normal, disconnection, short-circuit) of the piezoelectric elements.

Inventive Principle:

Principle #35Parameter changes

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 efficient detection of the state of multiple piezoelectric elements with reduced complexity, allowing for the detection of normal, abnormal, and disconnection states, and the number of elements in disconnection, thereby simplifying the device configuration and enhancing miniaturization.

Implementation Method 1

a state detection unit that detects a state of the plurality of piezoelectric elements based on a state detection signal generated from the plurality of piezoelectric elements in accordance with the state inspection signal

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS10153418B2Control circuit of piezoelectric driving device, piezoelectric driving device, ultrasonic motor, robot, hand, and pump

Publication Date: 2018.12.11 SEIKO EPSON CORP

AI summary

A control circuit of a piezoelectric driving device includes: a signal generation unit that inputs a state inspection signal to a plurality of piezoelectric elements connected to each other in parallel; and a state detection unit that detects a state of the plurality of piezoelectric elements based on a state detection signal generated from the plurality of piezoelectric elements in accordance with the state inspection signal.