One of the major bottlenecks of the traditional current transformer energy harvester (CTEH) is the instable output induced by the wide-range variations of the current in transmission lines. In this work, a novel CTEH capable of generating a stable output is demonstrated by using a core fabricated with saturable magnetic material. The stable output of the CTEH is enabled by the constant voltage-time product in its saturable characteristic. The proposed CTEH is implemented with a resistive load representing the load of electronic devices. When the current in the primary side of the CTEH's increases from 1 to 1000 A, the maximum power on the load can reach about 0.5 W, demonstrating the feasibility of using the CTEH with the saturable magnetic core as a quasi-stable power supply.
The position sensorless Permanent Magnet Synchronous Motor (PMSM) is
widely applied in the field of high reliability, and its driver, the
inverter is controlled by closed loop feedback with the three-phase
current. For medium and high power PMSM, both safety isolation and
detection accuracy of measuring current are extremely significant. This
paper presents a method of using Current Transformer (CT) with center
taps to measure the high-frequency switch current and of an algorithm to
reconstruct the low-frequency three-phase current. The measurement unit
and reconfiguration algorithm are then applied to the motor starting
stage controlled by the DSP controller TMS320F28335. Lastly, by
comparing the waveform of the reconstructed current and one of the
inverter phase current, the experimental results show that the proposed
reconstruction method is effective.
One of the major bottlenecks of the traditional Current Transformer
Energy Harvester (CTEH) is the instable output induced by the wide-range
variations of the current in transmission lines. In this work, a novel
CTEH capable of generating a stable output is demonstrated by using a
core fabricated with saturable magnetic material. The stable output of
the CTEH is enabled by the constant voltage-time product in its
saturable characteristic. The proposed CTEH is implemented with a
resistive load representing the load of electronic devices. When the
current in the primary side of the CTEH’s increases from 1A to 1000A,
the maximum power on the load can reach about 0.5W, demonstrating the
feasibility of using the CTEH with the saturable magnetic core as a
quasi-stable power supply.
The position sensorless permanent magnet synchronous motor (PMSM), with its simple structure, is applied in the aerospace field with high reliability requirements. To drive PMSM safely, the three‐phase current measured from the driver needs to be isolated for the closed‐loop control. And then, the accuracy current measurement is crucial for achieving optimal motor performance. In the paper, current transformer (CT) with centre taps is employed to isolate and measure the high‐frequency current of the inverter switch. Additionally, an algorithm is proposed to reconstruct the switch current into the low‐frequency phase current. Subsequently, the measuring method and the algorithm are applied to an inverter platform, which drives a 100W PMSM. Finally, the reconstructed phase current waveform is compared with the measured phase current waveform, and the experimental results show that the above method is effective and feasible.
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