On-line ac inductor loss tool gets more accurate
“It is a well-established but little understood fact that ac core losses increase when the ac ripple is dc biased – normal intuition says that dc bias does not increase ac cores losses because it is a static shift,” it said.
It is a situation found in buck regulators, for example, and can lead to unexpected temperature rise if not accounted for.
According to the company (see diagram):
The minor BH loop from the ac ripple follows along the general form of the major BH loop.
The permeability and hence inductance are proportional to the slope of the curves.
As the minor loop move closer towards saturation, the minor loop’s slope decreases.
This decreases inductance resulting in increased ripple current.
With the decreased slope and the BH loop becomes elongated, meaning more losses.
Thus, as dc bias is increased, the inductance will eventually start to decrease as it moves towards saturation which will in turn increase the ripple and the ac losses, the minor BH loop representing the hysteresis losses increases.
RedExpert can be found here in on-line and downloadable versions – use of either requires registration. It is available in six languages.
This introductory video is useful if you want to know that the tool does.
- Can igbt directly replace thyristor? What will be the impact of IGBT directly replacing thyristor?
- Easily understand the avalanche effect of power MOSFETs
- Google’s AI isn’t too ‘woke.’ It’s too rushed
- Comprehensive, flexible and reliable! NGI's high-performance power supply testing solution helps a top electronics institute conduct full-scenario testing
- What happens if the fast recovery diode of the switching power supply is damaged?
- How to solve the EMI problem of automotive power chips?
- Research on the basic characteristics of flexible PCB materials
- Solve the technical problems of multi-channel output power supply! PI launches InnoMux-2, improving efficiency by 10%
- Tailored for small devices, NFC wireless charging has full potential
- Apple’s EV cancelled