Gas water heater is one of the most important equipment for home bathing. It burns gas to generate heat energy and heat cold water, which is supplied to families through the water outlet.
The exhaust fan is the core part of the gas water heater, aiming to adjust the oxygen supply in real time based on the combustion situation in the water heater. The exhaust fan can achieve better combustion effect while producing less waste gas in result of improving the efficiency of the system. The motor of the exhaust fan would expel the waste gas of burning process outside and reduce the potential danger of gas poisoning to the lowest level, helping the gas water heater to achieve characteristics of higher efficiency, comfort and safety.
BPS & Linko has launched the LKS32MC03x series MCUs with high integration and excellent performance targeted at the application scenarios of gas water heaters. The LKS32MC03x can support the drive and control of upward and downward fan motor with control algorithms of rich functions and stable performance, providing comprehensive and excellent exhaust fan solutions.
The Solution
The Solution of the Exhaust Fan on LKS32MC034FLF
01 Applications
Downward-draught exhaust fan of gas water heater (Ambient temperature: -30°C~85°C)
Upward-draft fan of gas water heater (Ambient temperature: -30°C~85°C)
02 Features
Speed adjustment mode: PWM/VSP/UART
Control mode: Constant speed control/constant power control/constantt torque control/constant current control
High control precision: current control accuracy up to ±5mA
High integration: Integrates 6N gate driver, BEMF sampling circuit, LDO, etc.
High reliability: Reliable start-up under all rated loading, stable high-speed observer.
Protection: Hardware overcurrent protection, open phase protection, and stall protection, etc.
03 Application Diagram
04 Physical Picture
Enhanced BEMF +PLL
Excellent Robustness & Stability
The solution utilizes enhanced BEMF + PLL, which has the the characteristics of good robustness under low speed and high stability under high speed. The solution is suitable for the application scenarios where the motor parameters change greatly due to the large temperature difference of burning heat.
01 Operate stably and efficiently
（Figure1. Operating waveform at full speed-240Hz）
02 Reliable Start-up Performance
- No failure > 20000 times start-up
（Figure2. Start waveform）
03 Closed-loop Start-up, Fast Accleration
- From standstill to maximum speed<1500ms
（Figure3. Phase current waveform）
04 Excellent Dynamic Performance
- From 2000rpm to maximum speed<500ms
LKS Speed Curve Tool
Precise Air Intake Control
Intake air volume is directly related to combustion temperature, combustion adequacy and tempering problems. We offer the LKS speed curve tool for precise air intake volume control.
Powerful Real-time Debugging Tool
LKS Scope
The self-developed LKS Scope Tool can be used for real-time monitoring of control parameters, variables and waveforms.
Related Products
MCU - LKS32MC034FLF6Q8C
Features
- 48M Cortex-M0 + internal divider
- 12Bit 1.2M ADC + internal OPA
- Internal BEMF sampling circuit
- UART/SPI/IIC
- Internal 200V 6N gate driver
- ±1% high-precision RC clock
- Strong ESD & EFT
Applications
- Upward exhaust fan motor
- Downward exhaust fan motor
- Drainage pump in gas water heater
MCU - LKS32MC070RBT8
Features
- 96M Cortex-M0 + DSP
- 12K RAM + 128K Flash
- 2 X 12bit 3M ADC
- 4x internal OPA
- UART/SPI/IIC/CAN
- ±1% high-precision RC clock
- Strong ESD & EFT
Applications
- The exhaust fan motor of gas water heater
LKS563 Three-Phase Gate Driver
Features
- Integrated 6N gate driver
- Withstand voltage: 300V
- 1.1A maximum drive
- Power supply: 8V~20V
Applications
- Upward exhaust fan motor
- Downward exhaust fan motor
- Drainage pump in gas water heater
Summary
BPS & Linko relies on wide portfolio of MCUs and power products, as well as excellent product solutions, bringing superior performance, stable and reliable solution of exhaust fan motor of gas water heater based on LKS32MC034FLF. At present, this series of solutions have been tested and accepted by many customers. BPS & Linko are constantly optimizing its own products and solutions and making efforts to attain higher performance, higher reliability, and higher integrated solutions, bringing customers more superior products and solutions.
If you are interested in BPS products, please contact us and know more information：dadatong.support@wpgholdings.com.
- Realted Articles -
（Click the picture to see the related articles）
*The test results mentioned in the article are obtained under real test of laboratory. The actual products may be different depending on the application environment. BPS reserves the right of final interpretation.