Conversion Circuit Board for PTAC BLDC Motor Control

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Solution Overview

Problem

Conventional connections between the motherboard of a packaged terminal air conditioner (PTAC) and a brushless direct current (BLDC) motor result in low operational efficiency and high production costs.

Innovation Solution

A conversion circuit board that connects a PTAC motherboard to multiple BLDC motors, featuring a microprocessor module, power module, communication module, and interface modules, which includes a surge current suppression circuit, EMI circuit, rectifier circuit, and DC-DC converter circuit, enabling efficient power supply and communication between the motherboard and motors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the motherboard is directly connected to a single BLDC motor, then the connection is simple, but the operational efficiency is low and production cost is high

Engineering Contradiction:

Improveoperational efficiencyVSAvoidconnection structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system is segmented into a motherboard, a conversion circuit board, and multiple BLDC motors. The conversion circuit board acts as an intermediary that divides the control function, allowing the motherboard to control multiple motors through a standardized interface while the conversion circuit board handles the specific motor control requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conversion circuit board serves as an intermediary component between the motherboard and multiple BLDC motors. It receives control signals from the motherboard and distributes them to the appropriate motors, enabling efficient control of multiple motors through a single motherboard interface.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the motherboard directly controls multiple BLDC motors, then the control capability increases, but the production cost increases

Engineering Contradiction:

Improvemotor control capabilityVSAvoidproduction cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The conversion circuit board provides a universal interface that enables the motherboard to control multiple different types of BLDC motors through standardized connection protocols. This multi-functional capability allows the system to adapt to various motor configurations without requiring custom motherboard designs for each motor type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Instead of integrating complex motor control circuits directly into the motherboard for each motor, the patent uses a standardized conversion circuit board that can be replicated and configured for different motor types. This copying approach reduces development costs and simplifies manufacturing by using modular, reusable components.

Inventive Principle:

Principle #26Copying

3Productivity

If a conversion circuit board is introduced to connect the motherboard to multiple BLDC motors, then the operational efficiency improves, but the device complexity increases

Engineering Contradiction:

Improveoperational efficiencyVSAvoidcircuit board structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The conversion circuit board merges multiple motor control functions into a single integrated component. It combines signal conditioning, motor control logic, and communication interfaces in one board, reducing the overall system complexity compared to having separate control circuits for each motor.

Inventive Principle:

Principle #5Merging (Combining)

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 improves operational efficiency and reduces production costs by allowing one PTAC motherboard to drive multiple BLDC motors, providing stable power and facilitating efficient communication and control signals, thus enhancing the overall performance and cost-effectiveness of the system.

Implementation Method 1

The power module can comprise a surge current suppression circuit

Methodology Applied

Scientific EffectSurge current suppression:

Implementation Method 2

the rectifier circuit outputs a DC bus voltage

Methodology Applied

Scientific EffectRectification:

Implementation Method 3

the DC-DC converter circuit outputs a plurality of isolated independent power supplies

Methodology Applied

Scientific EffectDC-DC conversion:

Implementation Method 4

The rectifier circuit can be a rectifier comprising a voltage doubling circuit which is adapted to double the DC bus voltage

Methodology Applied

Scientific EffectVoltage doubling:

Implementation Method 5

an electromagnetic interference (EMI) circuit

Methodology Applied

Scientific EffectElectromagnetic interference filtering:

Data Source

PatentUS11018604B2Conversion circuit board of brushless direct current (BLDC) motor and packaged terminal air conditioner (PTAC) comprising the same

Publication Date: 2021.05.25 ZHONGSHAN BROAD OCEAN

AI summary

A conversion circuit board, including: a microprocessor module; a power module; a communication module; a first interface module; and a second interface module. The microprocessor module is adapted to communicate with a motherboard of an air conditioner via the communication module. The microprocessor module is adapted to connect to a first brushless direct current motor and a second brushless direct current motor via the first interface module and the second interface module, respectively. The power module supplies powers for the microprocessor module, the communication module, the first interface module, and the second interface module.