Overview

With the rapid development of smart homes, smart robotic vacuum cleaner have been upgraded to the main force of household cleaning. From the early "cute" models that randomly bumped into each other to the current cleaning assistants with intelligent planning capabilities, its technological progress is not only reflected in the innovation of navigation systems and mechanical design, but also in the upgrade of basic hardware levels such as circuit protection.

Sources of Static Electricity

Sweeping robots are prone to static electricity during operation. The main reasons include:

  • Frictional charging: The roller brush and side brush rub against the floor (especially carpets and hard floors) at high speed.
  • Dry air: Low humidity environment aggravates the accumulation of static electricity.
  • Plastic parts: Plastic materials such as robot shells and wheels are easy to be charged.

SD05C is a commonly used electrostatic suppressor, which is mainly used to suppress transient voltages generated by electrostatic discharge (ESD) to protect sensitive electronic components. In smart robotic vacuum cleaner, this device is mainly used to protect various signal transmission interfaces and key circuit areas susceptible to electrostatic interference.

How Does the SD05C ESD Suppressor Work in a Smart Robotic Vacuum Cleaner?-Protection Devices-TVS Diodes-ESD Protection devices-Gas Discharge Tube-Thyristor-Pled Protectors-Mov

Technical Features of SD05C

  1. High-precision voltage protection performance
  • 5V reverse shutdown voltage design, perfectly adapted to the working voltage of the main control chip of the sweeping robot
  • 6V breakdown voltage characteristics (test current 1mA), effectively realizing voltage stability control during electrostatic shock
  • Supports 350W peak pulse power (8/20μs waveform), fully meeting the ±15kV air discharge and ±8kV contact discharge protection requirements specified in the IEC 61000-4-2 standard
  1. Signal transmission fidelity technology
  • Low junction capacitance design ensures lossless transmission of sensor signals
  • Nanosecond-level fast response (<1ns), the protection mechanism is triggered instantly when static pulses appear
  1. Compact and energy-saving design
  • SOD-323 package (1.8×1.4mm) is perfectly adapted to the high-density circuit board design of sweeping robots
  • Ultra-low leakage current characteristics (only 0.2μA at 5V), meeting the energy-saving needs of long-term standby equipment
How Does the SD05C ESD Suppressor Work in a Smart Robotic Vacuum Cleaner?-Protection Devices-TVS Diodes-ESD Protection devices-Gas Discharge Tube-Thyristor-Pled Protectors-Mov

Application of SD05C in Smart Robotic Vacuum Cleaner

  • LiDAR signal protection scheme
    The SD05C device is deployed in the TTL signal transmission line of the LDS laser navigation module, mainly used to suppress the electrostatic interference introduced by the rotating mechanism. Actual test data shows that the scheme can effectively limit the transient voltage to below 12V under ±8kV direct discharge conditions, thereby protecting the microcontroller with an operating voltage of 3.3V from circuit lock damage caused by electrostatic discharge.
  • Battery balancing system protection design
    In the voltage balancing circuit of the lithium battery pack, SD05C and SMAJ48A TVS diodes are used to build a two-level protection mechanism. In this scheme, SD05C is responsible for handling conventional electrostatic discharge events. When a high-energy pulse that exceeds its processing capacity occurs, SMAJ48A will respond quickly to secondary voltage limitation, and double protection ensures the safe operation of the power MOSFET.
  • Wi-Fi, Bluetooth module protection
    Intelligent sweeping robots usually use wireless modules to achieve remote control and data reporting. Static electricity can enter the communication module through the antenna or shell coupling, affecting its stability.

Summary

Although the electrostatic suppressor is not a core component in intelligent robotic vacuum cleaners, its role should not be overlooked. By applying electrostatic suppression technology, the robot can perform cleaning tasks more reliably while also extending its service life.

Product Line

For datasheet and more details of SD05C, please visit the website:

https://en.semiware.com/tvs-array/sesd05c

About Semiware
Semiware has a comprehensive product lineup of circuit protection device products. The company leverages its technology in the semiconductor field and application background in end products to serve customers in the electronics, automotive and industrial markets. For more information, please visit semiware official website: https://en.semiware.com/