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Minsheng Shares: The Application of MEMS Sensors in Electronic Cigarettes

Application of MEMS Sensors in E-cigarettes
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E-cigarettes and MEMS

 

E-cigarettes do not contain harmful components such as tar and suspended particles. With the improvement of people's health awareness, smoking e-cigarettes is becoming a trend. Furthermore, e-cigarette oils can be flavored by adding different components, and users can choose the flavor of the e-liquid according to their preferences.

 

MEMS (Micro-Electro-Mechanical System) generally refers to a microelectromechanical system, which is a precision micro-processing carried out at the micrometer level to produce various types of microsensors and microactuators. The pressure sensor is one of the earliest sensors to appear and be applied in MEMS sensors. In terms of detection principles, it is mainly divided into piezoresistive type and capacitive type. Both use silicon materials to create micrometer-level pressure-sensitive diaphragms through pattern transfer and etching methods.

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E-cigarette Microphone

 

Currently, most e-cigarette products on the market use microphones as pressure switches. Microphones are inexpensive, but there are some pain points in their use that need to be addressed.

Consistency:

  • Multiple parts are assembled, resulting in assembly tolerances and inconsistent triggering pressure.

Oil Resistance:

  • E-liquid or water vapor entering the gap between the capacitive diaphragms causes performance degradation and, in severe cases, failure.

SMT Compatibility:

  • Manual soldering is required, and high soldering skills are needed, which affects production capacity.

 

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Single-Chip Solution

 

  • Single-chip differential pressure sensor for suction detection

  • One side of the device diaphragm is in contact with the airflow channel, and the other side is in contact with atmospheric pressure; it is waterproof and oil-proof.

  • Multiple output interfaces: interrupt, frequency, I 2 C

 

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Advantages over traditional microphones

 

  • Low cost: single-chip differential pressure detection, more compact overall design

  • Oil resistance: using a back-intake method, waterproof and oil-proof

  • Consistency: MEMS micrometer-level processing technology, small device differences, and factory calibration testing ensure consistent triggering pressure.

 

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Minxin believes that MEMS pressure sensors are one of the optimal solutions for implementing a suction switch in e-cigarettes. Through repeated improvements and optimization, Minxin's MEMS pressure sensors, which boast excellent reliability and stability, have been recognized and trusted by many customers and continue to be supplied in large quantities. Furthermore, leveraging the technological advantages of a MEMS platform company, Minxin has pioneered the development of chips including flow meters and flow switches, achieving coverage of the high, medium, and low-end e-cigarette market.

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