Motorized Blind Calibration with Voltage Protection

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Solution Overview

Problem

Motorized window-blind systems face challenges in calibration due to user error and electronic component damage from improper motor control, with existing calibration methods being inconvenient and costly.

Innovation Solution

A power-switching circuit using a TRIAC and TVS diodes for voltage protection, combined with a controller that measures voltage on a secondary winding to detect motor stoppage and facilitate calibration, reducing human error and component damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a user manually operates the calibration procedure by pressing buttons and waiting for prompts, then the calibration can be performed, but the process is inconvenient and prone to human error

Engineering Contradiction:

Improvecalibration accuracyVSAvoidcalibration convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system performs automatic calibration without requiring manual user intervention. The controller autonomously executes the calibration sequence, eliminating the need for users to press buttons and follow prompts, thereby reducing human error while maintaining calibration accuracy

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system prepares and executes the complete calibration sequence automatically upon receiving a calibration command, performing all necessary steps in advance without requiring incremental user input during the process

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the motor is controlled using conventional limit switches to cut off power at extreme positions, then the motor control function is achieved, but voltage spikes can damage electronic components

Engineering Contradiction:

Improvecircuit protectionVSAvoidvoltage spike damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

TVS diodes are installed in parallel with the motor windings to provide beforehand protection against voltage spikes. When voltage transients occur during motor switching, the TVS diodes clamp the voltage and dissipate the energy, preventing damage to electronic components before the damage can occur

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The harmful voltage spikes generated by inductive kickback during motor switching are converted into a beneficial protective mechanism. The TVS diodes capture and dissipate this harmful energy, transforming the potentially damaging voltage transients into a controlled energy dissipation process that protects the circuit

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Measurement precision

If the controller uses expensive electronic components and complex circuitry for motor control and calibration, then the control precision can be improved, but the system cost increases

Engineering Contradiction:

Improveposition detection accuracyVSAvoidsystem cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The system uses inexpensive TVS diodes for voltage protection instead of expensive complex protection circuits. These simple, low-cost components provide adequate protection against voltage spikes without requiring elaborate circuitry, reducing overall system cost while maintaining control precision

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The system replaces complex mechanical or electronic position sensing mechanisms with a simpler approach using the motor's own back-EMF voltage measurements. By measuring the voltage on the secondary winding, the system can detect motor stoppage and determine blind position without requiring additional expensive sensors or complex circuitry

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The solution enhances calibration precision, reduces human error, and provides cost-effective circuit protection, enabling safer and more efficient motor control in motorized systems.

Implementation Method 1

A power-switching circuit uses a TRIAC and TVS diodes for voltage protection

Methodology Applied

Scientific EffectTransient voltage suppression:

Implementation Method 2

a controller that measures voltage on a secondary winding to detect motor stoppage

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS10145173B2Motorized system with position calibration

Publication Date: 2018.12.04 SILVAIR SP ZOO

AI summary

A motorized system that allows for calibration by a user, and that features circuit protection and detection of motor stoppage. A motorized window-blind system is an example of such a system and is disclosed herein. In particular, a circuit is featured that comprises a TRIAC, or “triode for alternating current,” and TVS diodes, or “transient-voltage-suppression diodes,” providing voltage protection to various types of motor-related electronic components. A controller is disclosed that features measurement of voltage that is induced on a secondary winding of a motor, in order to detect certain events that occur during the operation of the motor. A calibration method is also disclosed that can account for one or both of the protection circuit and event-detecting controller. The calibration method accounts for human interaction and, in doing so, is intended toward making a calibration process of a motorized household system less prone to human error.