Analog Feedback Output for Motor Driver IC Flexibility

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing integrated motor driver circuits face limitations in flexibility and precision due to specific communication interfaces, predetermined bit numbers, and micro-controller dependencies, which restrict bandwidth and precision in motor control applications.

Innovation Solution

An integrated circuit with drive circuitry that provides motor control feedback as an analog output signal, allowing for flexible bit resolution and bandwidth, and compatibility with various micro-controllers, enabling discrete or continuous time control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If digital communication interfaces with predetermined bit numbers are used, then data format standardization is achieved, but flexibility in bit resolution and bandwidth is reduced

Engineering Contradiction:

Improveflexibility in bit resolutionVSAvoidcommunication interface complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent changes the fundamental parameter of feedback signal representation from discrete digital bits to continuous analog voltage. This allows the feedback signal to naturally accommodate any bit resolution requirement without changing the communication interface structure, as the analog voltage can represent any precision level depending on the external microcontroller's ADC resolution.

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If multiple connections are made between motor driver and micro-controller, then detailed feedback information is transmitted, but the number of connections increases

Engineering Contradiction:

Improvefeedback information completenessVSAvoidnumber of connections

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent extracts the feedback information transmission from multiple digital connection lines and consolidates it into a single analog output pin. This single pin carries all necessary feedback information (such as BEMF, current, position) in analog form, eliminating the need for multiple digital connections while preserving complete information.

Inventive Principle:

Principle #2Taking out (Extraction)

3Speed

If micro-controller processing speed determines feedback bandwidth, then system integration is simplified, but control loop bandwidth is limited

Engineering Contradiction:

Improvefeedback bandwidthVSAvoidmicro-controller dependency

Core Design Contradiction:

SpeedVSAdaptability or versatility

Solution Approach 1:

The patent replaces the digital sampling and processing mechanism (dependent on microcontroller speed) with an analog signal transmission mechanism. The analog feedback signal can be processed by external circuitry at much higher frequencies than typical microcontroller ADC sampling rates, effectively substituting the digital processing bottleneck with analog signal handling capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8339092B2Output contact for feedback in integrated circuit motor driver

Publication Date: 2012.12.25 AMI SEMICON BELGIUM

AI summary

An integrated circuit has drive circuitry to drive the windings of an electrical motor, means to make a measurement from the drive circuitry during rotation of the motor, suitable for use as motor control feedback, and has an output contact through which the motor control feedback measurement is available as an analog output signal. It can be used with an external motor control circuit coupled to receive the analog output signal to generate motor control signals, to control the drive circuitry. The analog feedback output gives more flexibility to the design of a motor control loop in terms of bit resolution, bandwidth and choice of discrete time or continuous time control.