Abstract
An inductively coupled wireless power transfer system is proposed in this paper, which is designed to comply with the battery’s load characteristics. A loosely coupled transformer with high coupling coefficient is proposed. A heterogeneous compensation topology is proposed which is able to switch between constant current and constant voltage output mode according to the load resistance. The output characteristic curve agrees with the charging curve of the battery in a whole cycle. The proposed topology has a misalignment range of 300 mm where the coupling coefficient is 0.2. A 3 kW experimental platform is established to verify the theoretical analysis, and the experimental results show that the proposed loosely coupled transformer has high coupling coefficient and high power transmission efficiency (95.2% in aligned position) within a large misalignment range, which agrees with the charging scenario of the electric vehicle.
Highlights
Inductive power transfer (IPT) realizes power transmission in a contact-less way [1,2], and this technique has been proven to be an ideal technical solution in various applications, like consumer electronics, biomedical implant devices, an underwater power supply, ball-joint structures [3], high-voltage insulation [4], and especially electric vehicles (EVs) [5]
The typical charging process of a lithium battery starts with constant current phase and, as the battery voltage increases, the charging scenario switches to constant voltage mode [6,7]
Phase shifting at a fixed frequency is an effective method to adjust the system output compensation topology being able to offer automatic switching between constant current and parameters [21,22], but the inverter may not operate at zero voltage switching (ZVS) state for wide constant voltage outputwhich always requires additional extra coils complicated control load variations, will decrease the efficiency of theswitches, system, and may even causeor power devices failure
Summary
Inductive power transfer (IPT) realizes power transmission in a contact-less way [1,2], and this technique has been proven to be an ideal technical solution in various applications, like consumer electronics, biomedical implant devices, an underwater power supply, ball-joint structures [3], high-voltage insulation [4], and especially electric vehicles (EVs) [5]. Phase shifting at a fixed frequency is an effective method to adjust the system output compensation topology being able to offer automatic switching between constant current and parameters [21,22], but the inverter may not operate at zero voltage switching (ZVS) state for wide constant voltage outputwhich always requires additional extra coils complicated control load variations, will decrease the efficiency of theswitches, system, and may even causeor power devices failure. The system of loosely coupled transformers is the discussed first, awithout compensation network with constant the output characteristics should agree with the charging curve of lithium battery. The operates a fixed frequency a zero phase condition is ensured during thetwo entire charging outputatand constant voltageand output features is angle proposed.
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