Design and Implementation of an Over Temperature Protection Circuit

Wang, Yonggang; Zhou, Zhimei; Wan, Yong

doi:10.1109/iciscae51034.2020.9236894

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…Therefore, its characteristics can be approximated using VF=Vturn_on+ r ˟ IF, and r=1.429Ω can be obtained. Therefore, LEDs ranging from 3W to 5W can be equivalently connected in series with a 3V voltage source and a 1.429Ω resistor [6] .…”

Section: Determination Of Led Equivalent Circuitmentioning

confidence: 99%

Design of LED constant current driving circuit

Cheng，,

2024

Preprint

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A 3W series LED constant current drive integrated circuit is designed in this paper. The driver can provide a constant current of 350mA for LED devices with over temperature and over voltage protection. When the power supply voltage fluctuates within ± 10%, the output driving current changes less than 5%; When the temperature of chip varies between 0 º C and 120 º C, the change in output driving current is less than 5%. The chip includes constant current drive, over temperature, and over voltage control circuits, as well as high-power driving NMOS devices. The control circuit consists of a bandgap voltage reference, an error amplifier, a sampling circuit. The bandgap voltage reference provides three reference voltages that are independent of temperature and power supply voltage; The sampling circuit and operational amplifier form a negative feedback circuit, allowing the sampling NMOS and power NMOS to operate at the same temperature and current density, so that the sampling current can more accurately reflect the changes in the output driving current of the power NMOS, and improve the control accuracy of the output driving current. By using a feedback control circuit, the sampling current tends to be constant, thereby achieving the goal of controlling the output driving current. The automatic adjustment of output current is achieved through over temperature and overvoltage circuits, which not only ensures the continuity of output current but also effectively ensures the safety of LED devices.

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Section: Determination Of Led Equivalent Circuitmentioning

confidence: 99%

Design of LED constant current driving circuit

Cheng，,

2024

Preprint

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“…Moreover, high temperatures will accelerate the chemical reaction of batteries and further increase the temperature, resulting in thermal runaway [6,7,8]. Circuit operation under high power conditions can not only affect robustness and long-term reliability of circuits [9,10], but also cause batteries to explode. Therefore, thermal protection functionality is critical for power electronics [11,12], such as low dropout regulators [13,14] or switching regulators [15,16,17].…”

Section: Introductionmentioning

confidence: 99%

A thermal protection circuit for fast battery charging LDOs

Xiao

Zhao

et al. 2022

IEICE Electron. Express

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This paper presents a novel thermal protection circuit for low dropout regulators (LDOs). To avoid thermal damage under high power conditions, the output current of LDOs varies with the sensed load temperature. Both the current delivery capability at a pre-set temperature and the limit slope of load current can be tuned to accommodate different load conditions and temperatures. The proposed design was fabricated with a 0.18 µm CMOS process with a chip area of 0.073 mm2. Chip measurement results show that the proposed design reduces charging time by 18% over the conventional thermal shutdown structure.

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Thermal Shutdown implementation in BLE microcontroller for TPMS and Industrial application

Chowdhury,

Kadlimatti

2024

2024 International Conference on Electronics, Information, and Communication (ICEIC)

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Design and Implementation of an Over Temperature Protection Circuit

Cited by 5 publications

References 1 publication

Design of LED constant current driving circuit

Design of LED constant current driving circuit

A thermal protection circuit for fast battery charging LDOs

Thermal Shutdown implementation in BLE microcontroller for TPMS and Industrial application

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