Newsletter-Autumn 2022
Recently, the financial reports of major companies are published in batches. The data from some of the leading semiconductor companies such as INTEL, AMD, and SAMSUNG have shown unprecedented drops in the fourth quarter of 2022 compared to the same period in 2021. The magnitudes of which are shocking and have even been called warning signs for the industry.
Company profile and Automotive catalog
Latest Issue of Company Profile and Datasheet
Fair location: National Exhibition and Convention Center (Shanghai Hongqiao)
November 15-18, electronica 2022 in Munich
Due to the pandemic’s impact, we have not seen you for some time. However, Firstohm resumes its participation in the electronica 2022 in Munich, showing you Firstohm's related products for energy-saving applications. Therefore, you are more than welcome to visit our booth for details.
Booth No: Hall A5.129
Date: November 15–18, 2022
Case Study
Following 2050 net zero carbon emission requirements, many large enterprises, such as Taiwan Power Company, are aggressive in preparing energy storage equipment and establishing power storage stations, hoping to pioneer the transformation to green energy. Therefore, in addition to the requirements of following legal systems, it’s foreseeable that more and more enterprises will adopt energy storage devices.
We are glad to share with you the heating states of Firstohm resistors applied on a 4.2V lithium battery for a partial reference to the battery balancing design. As illustrated in the below diagram, each battery cell will be balanced passively via a resistor. Once power is overcharged, the resistor will transform the excess energy into heat for release to keep each battery cell in the same electric energy.
This test simulates that the battery cell continuously outputs 4.2V to the resistor until the resistor reaches heat balance and measures the average temperature below points then. The test PCB diagram is shown above. (Top View)
Original solution: 5W Through Hole Resistor
Implementation: 5W MELF Resistor, SMD, small size, low cost
Test condition:
Ambient Temperature:26℃, Voltage of Battery Cell: 4.2V, Resistors: EFP501 (5W, 18R, 5%)x 12PCS connected in parallel
Measurement points: T1: 2mm from the edge of the resistor, T2: the resistor body, T3: surrounded by the resistor (center point)
Test Result (Average temperature): T1: 60.76℃、T2: 102.55℃、T3: 123.94℃
MELF resistor: Cylindrical construction ensures the effective film area is increased by three times, making it the largest SMD thin film resistor. While operating at high temperatures, the larger ceramic body ensures better heat dissipation.
MELF resistors are the first choice for high-reliability professional electronics. The above test is for reference to energy storage equipment (passive balancing circuit).
What We Did Last Quarter
August 24~27, 2022 Taipei Automation 2022
This exhibition aims at EV-related applications. We believe EVs will eventually create a new field of car-grade applications for Taiwan.
Thank you for taking the time to read this. If you have any questions, please feel free to contact your dedicated sales representative or “Contact Us”.
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What's New At Firstohm-Autumn 2022
Energy storage is using MELF resistor as passive balance.
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