Inductor Current Measurement In Switched Power Supplies

October 22, 2019

Browse other questions tagged switch mode power supply inductor current measurement buck ripple current or ask your own question. Wireless microsystems can add performance enhancing energy saving and networked intelligence to inaccessible places like the human body and large infrastructures like factories hospitals and farms.

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A Basic Question About Inductor Current In A Switching

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The buck converter consists of a diode a switch typically a mosfet and a single inductor for single phase applications.

Inductor current measurement in switched power supplies. Magnetic power supply components are designed. Figure 3 shows the measurement of the inductor current in blue for a switched mode power supply sensed with a current probe compatible with the oscilloscope used. The yellow waveform ch1 is the voltage across the inductor and the blue waveform ch2 is the current through the inductor.

Method of measuring the inductor current the inductor current waveform is observed using an oscilloscope and a current probe. Its also not apparent what the switching frequency or ringing frequency is. In switched mode power supplies smps magnetic components namely inductors and transformer play important roles.

In addition to the measurement shown in blue a purple marking was added indicating how the current flow through the inductor would look when the inductor starts to saturate excessively toward the peak currents. In the case of miniaturized supplies however inductors switch at 100 khz 1 mhz to produce micro amp currents that are difficult to sense. To reduce voltage ripple filters made of capacitors are normally added to such a converters output load side filter.

Measuring micro amp inductor currents in switched inductor dc dc power supplies abstract. One of the main reasons for measuring inductor current in a switched mode power supply is the ability to recognize whether the inductor was properly selected or inductor saturation will occur in. Not the answer youre looking for.

Transformers are used convert voltage levels and to provide isolation. Ill assume you have a small resistor in series with the vout end of the inductor. The current probe must clamp the current path and so a wire onto which the probe is clipped must be exposed as in the photo.

The dc input can be derived from rectified ac or from any dc supply. Unless you have an expensive current probe its pretty hard to make accurate measurements of inductor current. Inductors serve as energy storage devices or filters.