Complete MCU-Based Control Solution for Modern Home Appliances

Application

Description

Complete MCU-based control solution for modern home appliances including washing machines, air conditioners, refrigerators, and kitchen appliances. Features touch control interface, motor control, and smart connectivity.

Core Advantages

Integrated Touch Control 16-24 channel capacitive touch with advanced water rejection technology enables reliable operation in wet kitchen environments. Supports glass overlays up to 6mm thick with gesture recognition for intuitive user experience.

Energy-Efficient Motor Control Advanced BLDC motor control with FOC algorithm provides up to 30% energy savings compared to traditional AC motors. Quiet operation with precise speed control from 30-1500 RPM.

Smart Connectivity Integrated BLE 5.0 and WiFi connectivity enables remote monitoring, firmware updates, and integration with smart home ecosystems like Alexa and Google Home for premium user experience.

Comprehensive Protection Built-in overcurrent, overvoltage, overtemperature, and fault detection ensures safe operation and extends appliance lifespan. IEC 60730 Class B safety software support.

Modular Architecture Flexible MCU configuration allows tiered product offerings from basic models to premium connected appliances while maintaining software consistency and reducing development costs.

Recommended Bill of Materials (BOM)

Item	Part Number	Description	Quantity	Datasheet
1	HS32T024RGT6	Touch Control MCU with 24 channels	1	📄 Download
2	HS32M100C8T6	Motor Control MCU	1	📄 Download
3	HS32B101C8T6	BLE 5.0 Connectivity MCU	1	📄 Download
4	IRFB7530	60V N-Channel MOSFET for motor drive	6	📄 Download
5	0.05Ω Shunt	Current sense resistor	3	📄 Download

Applications

Washing machines and dryers

Air conditioners and heat pumps

Refrigerators and freezers

Dishwashers

Microwave ovens and cooking appliances

Technical Specifications

Input Voltage

110-240V AC ±10%

Operating Temperature

-10°C to +60°C

Storage Temperature

-20°C to +70°C

Humidity

5% to 95% RH non-condensing

Protection Class

IP20 (control board)

E M C Compliance

IEC 61000-4-x

Safety Standards

IEC 60335-1, IEC 60730

Customer Success Stories

Leading Home Appliance Manufacturer

Home Appliances | Smart Washing Machine Control System

Challenge

The customer needed to upgrade their washing machine lineup with modern touch controls, energy-efficient BLDC motor drive, and smart connectivity. Previous solutions used mechanical buttons and AC motors, resulting in limited features and higher energy consumption. They required a cost-effective solution that could be deployed across multiple product tiers.

Solution

Implemented a complete control solution using HS32T024RGT6 for the 16-channel touch control panel with water rejection, HS32M100C8T6 for BLDC motor control with FOC algorithm, and HS32B101C8T6 for BLE 5.0 connectivity. The solution included capacitive touch buttons for program selection, a slider for cycle adjustment, and haptic feedback. The motor control implementation provided variable speed control from 30 to 1500 RPM with precise torque control.

Results

Air Conditioning OEM

HVAC | Inverter Air Conditioner Controller

Challenge

The customer required an energy-efficient control solution for inverter air conditioners with precise temperature control, low noise operation, and smart home connectivity. The solution needed to support variable speed compressor control, indoor/outdoor fan control, and multiple sensor inputs while meeting strict efficiency regulations.

Solution

Developed a dual-MCU solution using HS32M200RGT6 for high-performance compressor motor control with FOC algorithm and field weakening, and HS32T016C8T6 for touch control panel and system management. The solution included PFC (Power Factor Correction) control, multiple temperature sensor interfaces, and BLE connectivity for smart control via mobile app.

Results

FAE Expert Insights

Senior FAE

Applications Engineer

10+ years

Professional Insights

The home appliance market is rapidly transitioning to intelligent, connected devices. Based on my 12 years of experience supporting major appliance manufacturers, I observe that the key success factors are reliability in harsh environments, energy efficiency, and seamless user experience. The integration of touch control, motor control, and connectivity in a cohesive solution addresses all these requirements. I particularly recommend the HS32T024RGT6 for premium appliances due to its gesture recognition and enhanced water rejection capabilities. For motor control, the FOC implementation on HS32M200RGT6 provides exceptional efficiency - I've seen up to 35% energy savings in real applications. When designing these systems, pay special attention to EMI/EMC compliance early in the design phase, as appliances must meet strict emission standards. The modular approach using multiple MCUs allows tiered product offerings while maintaining software consistency across the lineup.

Key Takeaways

Use HS32T024RGT6 for premium touch interfaces with gesture support
Implement FOC motor control for 25-35% energy savings
Design for IEC 60335 safety compliance from the start
Modular MCU approach enables tiered product offerings
BLE 5.0 connectivity adds smart home value with minimal cost impact

Decision Framework

Steps:

Evaluate motor type and control requirements
Determine user interface complexity (touch, display, etc.)
Assess connectivity needs (BLE, WiFi, none)
Select appropriate MCU combination
Plan for safety certifications from start

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

Frequently Asked Questions

What certifications are required for home appliance control systems?

Home appliance control systems require multiple certifications depending on the target market: Safety certifications - IEC 60335-1 (Household appliances), IEC 60730 (Automatic controls), UL 60730 (North America), GB 4706 (China)

EMC certifications - IEC 61000-6-1/6-3 (Immunity/Emissions), CISPR 14-1 (EMC), FCC Part 15 (USA), EN 55014 (Europe)

Energy efficiency - DOE/Energy Star (USA), ERP Directive (Europe), China Energy Label. The control system must be evaluated as part of the complete appliance. Key requirements include: creepage and clearance distances, protection against electric shock, fire resistance, software safety class B or C per IEC 60730, and electromagnetic compatibility. BeiLuo provides reference designs with pre-certified architectures and documentation support for certification processes.

Plan for certification early; use reference designs with proven architectures; work with certified test labs.

How do I implement water rejection for kitchen appliance touch panels?

Water rejection is critical for kitchen appliances. Implementation involves hardware and software: Hardware design - Use guard rings around touch pads connected to driven shield

Maintain consistent overlay thickness (glass, acrylic)

Ensure proper sealing between overlay and PCB

Add drainage channels in mechanical design. Software configuration - Enable water rejection algorithm in touch library

Set appropriate sensitivity levels (typically 150-200 for wet conditions)

Configure multi-channel water detection

Implement dynamic threshold adjustment. Testing procedures - Test with water droplets, spray, and continuous flow

Verify operation with soapy water and cleaning solutions

Test across temperature range

Validate recovery time after water removal. The HS32T024RGT6 includes enhanced water rejection with submersible detection capability. For best results, combine hardware shielding with software algorithms.

Use HS32T024RGT6 for enhanced water rejection; implement guard rings; test with actual water exposure conditions.

What motor control algorithm should I use for appliance applications?

Motor control algorithm selection depends on motor type and performance requirements: 6-step trapezoidal control - Simplest implementation, suitable for fans and pumps where torque ripple is acceptable

Good efficiency (85-90%)

Lower computational requirements

Works with Hall sensors or sensorless. FOC (Field Oriented Control) - Best for compressors and high-performance drives

Excellent efficiency (90-95%)

Very low torque ripple

Requires higher computational power (Cortex-M4 recommended)

Can operate sensorless or with encoder. For washing machines, use FOC for the main drum motor and 6-step for drain pumps. For air conditioners, FOC is essential for compressor control. The HS32M200RGT6 with FPU is recommended for FOC applications, providing 10x faster trigonometric calculations. Both algorithms are available in Hangshun's motor control libraries with example code.

Use FOC for compressors and main motors; 6-step for fans and pumps; HS32M200RGT6 for FOC applications.

How do I ensure EMI compliance for appliance control systems?

EMI compliance is critical for appliance certification. Design guidelines include: PCB layout - Keep high-speed traces short

Use ground planes with minimal splits

Separate analog and digital grounds at single point

Place decoupling capacitors close to MCU

Motor drive - Use snubber circuits on MOSFETs

Implement proper gate drive resistors

Use shielded cables for motor connections

Add common mode chokes

Power supply - Use EMI filters on AC input

Implement proper PFC

Add ferrite beads on power lines

Shielding - Use metal enclosures for high-power sections

Proper grounding of shields

Filter all I/O lines. Testing: Pre-compliance testing during development

Full EMC testing at certified lab

Address issues early to avoid costly redesigns. The HS32M100C8T6 and HS32M200RGT6 include features like slew rate control to reduce EMI. Reference designs include EMI-optimized layouts.

Follow EMI design guidelines from start; use reference designs; test early and often; allow margin for production variations.

What are the key considerations for smart connectivity in appliances?

Smart connectivity implementation involves several considerations: Protocol selection - BLE 5.0 for direct smartphone connection

WiFi for cloud connectivity

Sub-1GHz for long-range industrial applications

Security - Implement secure boot

Use authenticated pairing

Encrypt sensitive data

Regular security updates

Power management - Use sleep modes between transmissions

Optimize connection intervals

Consider wake-on-BLE for battery-powered devices

User experience - Simple pairing process

Reliable reconnection

Clear status indication

Mobile app design

Certification - WiFi Alliance certification

Bluetooth SIG qualification

Cloud platform compliance. The HS32B101C8T6 provides BLE 5.0 with 2Mbps and long-range capabilities. For cloud-connected appliances, consider a WiFi+BLE combo module. Implementation should include fallback operation if connectivity is lost, ensuring appliance functionality is not dependent on network connection.

Use BLE 5.0 for smartphone connectivity; implement strong security; ensure fallback operation; plan for certification.

How do I implement safety monitoring per IEC 60730 Class B?

IEC 60730 Class B requires specific safety measures for appliance controls: MCU requirements - CPU test (instruction test, watchdog)

Clock monitoring (independent watchdog)

Memory test (RAM, Flash CRC)

Peripheral test (ADC reference, GPIO)

Software requirements - Plausibility checks on sensor values

Cross-checking of safety-critical calculations

Safe state definition on fault detection

Fault detection time requirements

Implementation approach - Use independent watchdog with window function

Implement CPU self-test at startup and periodically

Add CRC checks for Flash and RAM

Cross-check critical ADC readings with independent channel

Test safety outputs at each cycle. The HS32F103 and HS32F405 series include hardware features supporting Class B implementation. Hangshun provides Class B software libraries with certification documentation. Important: Class B software must be isolated from application software

use separate memory regions and minimal interfaces.

Use Class B certified libraries; implement independent watchdog; add CPU and memory tests; cross-check critical functions.