Author Archives: Allyson Lambert

Design Guidelines for a Power Factor Correction (PFC) Circuit Using a Capacitor and an NTC Thermistor

OBJECTIVE Ametherm inrush current limiters are used in many applications today that require suppression of surge current when power is first applied to the system. One of the popular applications of Ametherm inrush current limiters is in power factor correction circuits. This article provides a solution for finding the correct power factor correction (PFC) circuit for an inductive load. This solution is suitable for applications that include ballasts, LED drivers, … Continue Reading

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Enabling Higher Power Efficiency through Thermistor-based Temperature Compensation

By Balaji Santhanam, Hubble Power Systems Mehdi Samii, Ametherm Inc. Originally Published in Power System Design  Magazine  As electronic systems continue to become more compact, temperature plays an increasingly important role in system reliability and power efficiency. Many engineers are already familiar with how temperature can affect reliability; if a system becomes too hot, device operation can become unpredictable. Using a simple temperature sensor like a thermistor, the host processor can monitor … Continue Reading

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Thermistors used to Measure Temperature in Lake Tahoe

Recently, the SFGate released an article about how thermistors are used to measure temperature change in Lake Tahoe. The article states that over the past 40 years, global warming has caused the temperature of lakes to rise, affecting the natural habitat for fish species and algae blooms. Scientists at the Tahoe Environmental Research Center carefully monitor the lake’s temperature using thermistors carried by large ocean buoys. Signals from the buoys transmit data via satellite to scientists at NASA’s Jet Propulsion Laboratory in … Continue Reading

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ACCU-CURVE™ Thermistors for High Accuracy Temperature Sensing

What’s an ACCU-CURVE™ Thermistor? ACCU-CURVE™ thermistors are used for high-accuracy temperature sensing, control, and compensation in medical, industrial, and automotive applications. They also deliver long-term stability and reliability, while offering interchangeability over a broad temperature range. This eliminates the need to individually calibrate or provide circuit compensation for part variability. Accurate temperature measurement to ±0.2°C is available over the 0°C to 70°C temperature range. Standard ohmic values at 25°C range from 2,252 to 100,000 ohms. ACCU-CURVE™ Thermistor vs. … Continue Reading

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Follow Ametherm on Social Media!

The time has come for Ametherm to go digital! While pen and paper remain true to our hearts, the engineers here at Ametherm want to share their wealth of the research, development and knowledge of inrush current limiters and thermistors at a more consistent and rapid pace. What better way than to… tweet it? Or, share it on Facebook.     Like us on Facebook!     Follow us on Twitter!    … Continue Reading

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