Fan & Air Purifier
Orientation Detection and Tip-Over Protection Application Guide
Learn how standing fans, air circulators, air purifiers and other upright appliances use tilt sensors to detect orientation and tip-over conditions, then trigger shutdown, alerts or safety protection through the control system.
Why do upright appliances need orientation and tip-over detection?
Upright appliances such as standing fans, air circulators, air purifiers, dehumidifiers and portable air conditioners may tilt or tip over due to collision, pushing, movement, cable pulling or uneven flooring.
Abnormal orientation may affect normal equipment operation. Taking a fan as an example, if the motor continues running after the unit falls, it may increase the risk of mechanism jamming, product damage or contact with rotating parts. Therefore, the tilt condition can be integrated into the control logic as a trigger for shutdown, alerts or safety protection.
If you only need fixed-angle judgment, an IMU is not always necessary
If the system only needs to know “normal / abnormal” or “whether the set angle is exceeded,” a fixed-angle tilt switch can provide a simple status signal and reduce sensing-data processing and firmware complexity.
Fixed Angle / State Judgment
Suitable for applications that only need to determine normal / abnormal status or whether a defined threshold has been exceeded, and can directly provide an ON/OFF-type control input.
Continuous Angle / Dynamic Orientation
If the application requires continuous angle display, direction vectors or dynamic orientation information, an accelerometer, IMU or continuous-angle sensing solution should be evaluated.
How does the system judge orientation and tip-over status?
Why consider omnidirectional tip-over detection?
The actual tip-over direction cannot be determined in advance. Equipment may fall forward, backward, sideways or diagonally. If product safety requirements call for recognition of tip-over conditions from different directions, an omnidirectional orientation-detection approach can be evaluated to improve the completeness of abnormal-state judgment.
Recommended Sensing Solutions and Selection Direction
| Application Need | Recommended Sensing Solution | Description |
|---|---|---|
| Only Normal / Abnormal Judgment Required | Fixed-Angle Tilt Switch | Suitable for use with an ON/OFF status as the control input. |
| Need Fixed Angle and Omnidirectional Judgment | RBS31 Series | Can be used as the orientation-judgment input for upright appliances. |
| Actual Fan Tip-Over Protection Case | RBS3109 Photoelectric Ball Sensor | The original case was used for fan orientation and tip-over detection. |
| Need Continuous Angle Values | Accelerometer / IMU / Tilt Sensor | Suitable for applications requiring precise angle data or direction vectors. |
What should be confirmed during design?
- The maximum acceptable orientation and tilt range during normal operation.
- The angle and orientation conditions that should trigger shutdown or an alert.
- The PCB, sensor location and actual installation angle, including mechanical tolerances of the complete product.
- Whether startup, motor/fan vibration, movement or collision may cause temporary triggering.
- Whether the unit should shut down immediately after tipping over, and whether automatic restart is allowed after the appliance is returned upright.
- If precise angle values or direction information are required, a continuous-angle sensing solution should be used instead.
Suitable Applications
OncQue Application Solutions
RBS3109 | Fan Tip-Over Protection Case
In the original case, the RBS3109 photoelectric ball sensor was applied in a fan product to provide a shutdown judgment signal when the equipment tips over through real-time orientation and tip-over detection.
RBS31 Series | Fixed-Angle and Omnidirectional Orientation Judgment
Another guide positions the RBS31 Series as a sensing solution for fixed-angle and omnidirectional orientation judgment, suitable for evaluation in standing fans, air purifiers and other upright appliances.
CONTACT ONCQUE
If you provide the equipment’s normal orientation, desired trigger angle, PCB mounting direction and vibration conditions, we can help evaluate the suitable sensor specification and configuration method.