Newsletter-Spring 2024
In 2023, the world faced escalating challenges of extreme weather due to climate change. Coupled with the impact of the pandemic and geopolitical factors, businesses are increasingly aware of the importance of sustainable operations. Incorporating ESG (Environmental, Social, and Governance) into corporate philosophy has become a mainstream trend for sustainable development.
Located in scenic eastern Taiwan, Firstohm’s factory enjoys abundant natural resources. With over 55 years of experience in resistor manufacturing, we deeply understand the importance of sustainable operations. 2024 marks the first spring after the completion of our new factory, where we will produce resistors powered by solar energy. Our resistor products are widely used in green energy-related industries such as electric vehicles, charging stations, smart meters, solar inverters, and energy storage systems. By providing customers with high-quality and durable resistors, we contribute to prolonging the lifespan of end products, thereby promoting environmental sustainability.
Electronica 2024 in ShangHai and Delhi
★ July 8-10, 2024 electronica China (Shanghai)
Venue: Shanghai New International Expo Center
Date: July 8-10, 2024
Booth: E5.5606
★ Sep. 11~13, 2024 electronica India
Venue: India Expo Centre, Greater Noida, Delhi NCR, India
Date: Sep. 11~13, 2024
Booth: Hall 10, G61
Firstohm will showcase resistor product applications related to the green energy industry. In this widely discussed issue of corporate sustainability, we are committed to providing resistor products that exceed industry standards and are highly reliable. We warmly welcome all professionals to visit us and provide guidance!
★ Pre-charge resistor application
A pre-charge circuit is a circuit design principle where specific components (such as capacitors) are pre-charged before the electronic device is powered on and then connected to the main circuit. The purpose of this is to reduce the current impact during startup, protecting the system and components from excessive voltage or current effects. This pre-charge principle effectively reduces the impact during the startup of electronic devices, prolongs the lifespan of system components, and enhances the system's overall stability.
Firstohm Anti-Surge Wire Wound Resistor (SWM/SWA): Possessing multiple-country welding point patents, these resistors enhance product reliability, offer high pulse withstand capability, are cost-effective, and come in a compact size. They are particularly suitable for use as pre-charge resistors or discharge resistors.
※Type of pre-charge resistor:
※ Applications
1. Industrial Power Supplies
2 Inverter
3. Battery Management Systems (BMS)
4. Electric Vehicle Charging Station
5. Energy Storage Systems
6. Industrial Equipment
※ Reference Case
Pre-charge Circuit for Inverters – Solution: SWA03 3W 68R 5% *1PCS
Test Conditions: Input Voltage: 357.8VDC
Charge Capacitance: 648µF
Number of Test Cycles: 10,000 cycles
Maximum Power = 357.8V x 357.8V/68R = 1882W, Time Constant (RC/2) = 22ms (Note 1)
SWA03 can withstand 3000W under 22ms. (refer to the SWA03 surge performance chart below.)
Test Result: △R: +0.42% (PASS)
Note 1: In pre-charge applications, the time constant when energy is at its maximum depends on the values of the RC (resistor and capacitor) components in the circuit. The time constant (τ) is typically calculated as half of the product of RC. Time Constant (τ) = RC / 2.
★September 13-15, 2023 electronica India
After the global pandemic, the electronica India 2023 welcomed everyone once again. The exhibition hall was bustling with people and especially various new and old distributors all came in attendance. Firstohm sincerely welcomes all distributors to join in the promotion together. We would like to express our special thanks to SM Electronic Technologies for their contribution and continuous promotion in the Indian market over the years, as well as for assisting in transporting the necessary materials for this exhibition, which contributed to the success of the event. The exhibition yielded fruitful results, marking it as the most successful in recent years.
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