TY - JOUR
T1 - A novel contactless, feedbackless and sensorless power delivery link to electromagnetic levitation melting system residing in sealed compartment
AU - Darhovsky, Yegal
AU - Mellincovsky, Martin
AU - Baimel, Dmitry
AU - Kuperman, Alon
N1 - Funding Information:
This work was supported in part by the Israel Science Foundation , grant number 2186/19 .
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/9/15
Y1 - 2021/9/15
N2 - The paper presents practical considerations and guidelines for designing an improved-efficiency contactless inductive power transfer link, delivering DC power in step-down mode to an electromagnetic levitation melting system residing in a sealed compartment. The proposed arrangement employs none-series compensated inductive power transfer link operating at the so-called “load-independent-voltage-output” frequency, allowing feedback-less and sensor-less design. However, the output voltage of a system operating at such frequency remains influenced by the load to some extent, residing within a certain range with boundary values (minimum and maximum) corresponding to maximum (rated) and minimum load, respectively. Consequently, the proposed contactless power delivery system is first analyzed using both first harmonic approximation (frequency-domain) based approach and differential equations (time-domain) based method to obtain corresponding output voltage bounds. Then, coil-to-coil efficiency and optimal load matching factor are determined. Comparison with both typically utilized symmetrical series-series and recently proposed series-none compensation topologies reveals the superiority of none-series compensation topology in terms of coil-to-coil efficiency for the whole range of coupling coefficients. Simulations and experiments of 400 V, 1 kW none-to-series compensated inductive wireless power transfer link, delivering contactless energy to a 250 V electromagnetic levitation melting system, demonstrate excellent matching and accurately validate the presented analysis.
AB - The paper presents practical considerations and guidelines for designing an improved-efficiency contactless inductive power transfer link, delivering DC power in step-down mode to an electromagnetic levitation melting system residing in a sealed compartment. The proposed arrangement employs none-series compensated inductive power transfer link operating at the so-called “load-independent-voltage-output” frequency, allowing feedback-less and sensor-less design. However, the output voltage of a system operating at such frequency remains influenced by the load to some extent, residing within a certain range with boundary values (minimum and maximum) corresponding to maximum (rated) and minimum load, respectively. Consequently, the proposed contactless power delivery system is first analyzed using both first harmonic approximation (frequency-domain) based approach and differential equations (time-domain) based method to obtain corresponding output voltage bounds. Then, coil-to-coil efficiency and optimal load matching factor are determined. Comparison with both typically utilized symmetrical series-series and recently proposed series-none compensation topologies reveals the superiority of none-series compensation topology in terms of coil-to-coil efficiency for the whole range of coupling coefficients. Simulations and experiments of 400 V, 1 kW none-to-series compensated inductive wireless power transfer link, delivering contactless energy to a 250 V electromagnetic levitation melting system, demonstrate excellent matching and accurately validate the presented analysis.
KW - Efficiency
KW - Inductive wireless power transfer
KW - Load independent voltage output
KW - None-series compensation
KW - Output voltage range
UR - http://www.scopus.com/inward/record.url?scp=85106955572&partnerID=8YFLogxK
U2 - 10.1016/j.energy.2021.120789
DO - 10.1016/j.energy.2021.120789
M3 - Article
AN - SCOPUS:85106955572
VL - 231
JO - Energy
JF - Energy
SN - 0360-5442
M1 - 120789
ER -
