{"id":1815,"date":"2025-01-02T14:27:33","date_gmt":"2025-01-02T06:27:33","guid":{"rendered":"https:\/\/www.telesplicing.com.tw\/demo\/?page_id=1815"},"modified":"2025-01-07T11:38:33","modified_gmt":"2025-01-07T03:38:33","slug":"inductor-measurement-including-dc-bias","status":"publish","type":"page","link":"https:\/\/www.telesplicing.com.tw\/demo\/inductor-measurement-including-dc-bias\/","title":{"rendered":"Inductor Measurement Including DC Bias"},"content":{"rendered":"\n
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Inductor Measurement Including DC Bias<\/h2>\n\n\n\n

The most important component in a switching power supply besides the power IC is its power inductor. A power inductor has a high permeability core around which the windings are wound. It saturates when the current flowing through the conductors is larger than its saturation value. Saturation is a material property of the magnetic core. DC bias current through an inductor affects the inductance versus frequency plot. So, it is important to measure the inductance versus frequency under DC current bias.<\/p>\n\n\n\n

The J2121A line injector enables inductance measurement using a 3-port configuration, using the Bode 100 vector network analyzer (VNA), as shown below. It combines the oscillator signal from a VNA with the DC current bias (from a power supply such as the PICOTEST P9610A or P9611A). The J2121A can be used to inject up to 20A of current at 400 V DC and has a measurement bandwidth of 100Hz \u2013 1MHz. The P9610A can source up to 7A of current with a programming resolution of 0.21mA and P9611A can source up to 6A of current with a programming resolution of up to 1mA. For higher current, more than one supply can be paralleled. The J2121A includes a new 200mA power supply design (and an included 1 Ohm calibrator fixture), forced air cooling, and CE certification. The J2121A solution also replaces the need for a current probe, which would typically cost as much as the line injector itself.<\/p>\n\n\n\n

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