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Introduction
Torque hinges are widely used in various electronic devices, such as laptops, tablets, and smartphones, to provide a smooth and controlled movement of the display or cover. However, the electromagnetic compatibility (EMC) design of torque hinges is often overlooked, which may lead to electromagnetic interference (EMI) issues. In this article, we will discuss the EMC design and interference countermeasures for torque hinges.
EMC Design for Torque Hinges
1. Grounding: Proper grounding is essential for reducing EMI. The torque hinge should be connected to the device’s ground plane through a low-impedance path.
2. Shielding: The torque hinge should be shielded to prevent EMI from escaping. The shield should be connected to the device’s ground plane.
3. Filtering: The use of filters can reduce EMI at the source. Ferrite beads, capacitors, and inductors can be used to suppress EMI.
4. Layout: The layout of the torque hinge should be optimized to minimize the loop area. The loop area is the area enclosed by the signal and return paths.
5. Signal Integrity: The signal integrity of the torque hinge should be maintained to prevent EMI. The signal path should be kept away from noisy components.
Interference Countermeasures for Torque Hinges
1. Shielding: Shielding can also be used as a countermeasure to reduce EMI. The shield should be grounded to the device’s ground plane.
2. Filtering: The use of filters can also be used as a countermeasure. Ferrite beads, capacitors, and inductors can be used to suppress EMI.
3. Grounding: Proper grounding is essential for reducing EMI. The torque hinge should be connected to the device’s ground plane through a low-impedance path.
4. Layout: The layout of the torque hinge should be optimized to minimize the loop area. The loop area is the area enclosed by the signal and return paths.
5. Test and Measurement: EMI testing and measurement should be performed to ensure compliance with EMC standards. This can include radiated and conducted emissions testing.
6. Compliance: The torque hinge should comply with EMC standards, such as FCC and CE.
7. Education: Educating design engineers and manufacturers about EMC design and interference countermeasures can help prevent EMI issues in the future.