Journal of information and communication convergence engineering

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Maximum Current Estimation Method for the Backup of Current Sensor Faults

  • Kim, Jae-Yeon (Electrification Development Team, Valeo Pyeong Hwa) ;
  • Park, Si-Hyun (Department of Electronic Engineering, Yeungnam University) ;
  • Suh, Young-Suk (Department of Electronic Engineering, Yeungnam University)
  • Received : 2020.04.30
  • Accepted : 2020.09.03
  • Published : 2020.09.30
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Abstract

This paper presents a new method for controlling the current of lighting LEDs without current sensors. This method can be used as backup against LED current sensor faults. LED lighting requires a circuit with a constant current in order to maintain the same brightness when the ambient temperature changes. Therefore, we propose a new current estimation method to provide backup in case of current sensor faults based on the calculation of the inductor current. In the fabricated circuit, the average current changes from 144.03 mA to 155.97 mA when the ambient temperature changes from 0℃ to 60℃. The application of this study can enable the fabrication of a driving IC for LEDs in the form of a single chip without sensing resistors. This is expected to reduce the complexity of the peripheral circuit and enable precise feedback control.

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References

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