Long‐distance wireless power transfer system powering multiple loads with constant voltage outputs using S‐SP compensation

Abstract

This paper proposes a long-distance multi-load wireless power transfer (WPT) system with a constant voltage (CV) output for each load. A repeater unit consisting of two bipolar repeater coils is designed to power the load. Multiple repeater units are placed in a line and the power can be transferred from one unit to the next. Each repeater unit corresponds to one load and multiple loads can be powered simultaneously. The two repeater coils in the same repeater unit are placed perpendicularly to eliminate the magnetic coupling between them. In each repeater unit, a compensation capacitor is placed in series with the transmitting coil while two extra compensation capacitors form a series-parallel (SP) structure for the receiving coil. When neglecting the coil's parasitic resistance, the CV characteristics can be obtained, which enables the independent and flexible power control of each load. Moreover, the influence of the parasitic resistances on the system performance is analysed. Such a system is especially suitable for powering the gate drivers in a high-voltage converter where multiple insulated gate bipolar transistors (IGBTs) are connected in series. An experimental setup with six loads is constructed to validate the proposed system. The maximum system efficiency can reach 88.1%.

Constant Voltage Design Using <i>K</i>-Inverter for Cooperative Inductive Power Transfer

“…Recently, several methods have been proposed to realize cooperative IPT systems with load-independent output voltages [26,27]. For these methods, each of the transmitter and the distant receiver was equipped with one coil while the nearby receiver was equipped with two coils, namely the receiving coil and the transmitting coil.…”

“…For these methods, each of the transmitter and the distant receiver was equipped with one coil while the nearby receiver was equipped with two coils, namely the receiving coil and the transmitting coil. In [26], the series-parallel-series compensation scheme was used for each of the nearby receiver and the distant receiver while the series compensation was used for the transmitter. However, the design of the compensation scheme in [26] was based on the mutual inductance between two adjacent coils.…”

“…In [26], the series-parallel-series compensation scheme was used for each of the nearby receiver and the distant receiver while the series compensation was used for the transmitter. However, the design of the compensation scheme in [26] was based on the mutual inductance between two adjacent coils. There-fore, the stability of the load voltages over load variations would be sensitive to the misalignment of the coils.…”

A 2-D Inductive Power Transfer Network for Powering Massive Neighboring IoT Devices

“…Wireless power transfer (WPT) has been widely used in the areas of electric vehicles [1], high-speed train [2], and drone [3], etc. In addition to the trend towards higher power conversion capability and efficiency, WPT is also moving towards multiple loads [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], omnidirectional [18], [19], [20] and long-distance [21], [22] applications.…”

Charging scheduling strategy for linear wireless power transfer network with external power injection

“…With the increasing demand of WPT for multiple devices simultaneously, multiload WPT technology has attracted more and more interest. Prior studies improved the performances of multiload WPT system, including modeling and analysis methods, 10 constant voltage outputs, 11 compensation topology design, 12 transmission efficiency stability, 13 system efficiency maximization, 14 and so on. However, due to the randomness and time variability of the load position, these multiload WPT systems have the disadvantages such as low space utilization, hardware redundancy, loads interfering with each other, power distribution, and poor real‐time performance.…”