Abstract
In wireless power transfer (WPT) system, communication between the primary and the secondary plays an important role in system status monitoring and operation control. Bidirectional information transmission is also essential to detect the working state and send control command in both sides. This article proposes a bidirectional simultaneous wireless information and power transfer method. The secondary has a simple structure and employs only one switch. The proposed WPT system can achieve bidirectional information transmission via a sharing inductive link. The forward information is transferred by using a single full bridge inverter based on selected harmonic elimination PWM (SHEPWM) control methods without other high-frequency signal sources. In the secondary side, uncontrolled rectifier and a parallel MOSFET are adopted to realize constant voltage output and backward information transfer. The backward information modulation is achieved by changing the switching frequency of MOSFET. The forward and backward information demodulation modules are designed and analyzed in details. A 30W experiment platform with forward communication rate 5 kbps and backward communication rate 10 kbps is built to verify this proposed method.
Highlights
In recent years, wireless power transfer technology has been developed rapidly
Compared with traditional wired power transmission, wireless power transfer (WPT) technology has many advantages, such as convenience, stable transmission, security, contactlessness. This technology can be widely used in many fields, such as electric vehicles [1]–[5], battery charging [6], [7], light rail vehicles [8] and consumer electronics
The performance of WPT system has been optimized by changing the coil shape and number [11], using novel switching devices [12], [13], and enhancing the inductive coupling characteristics [14]
Summary
Wireless power transfer technology has been developed rapidly. Compared with traditional wired power transmission, WPT technology has many advantages, such as convenience, stable transmission, security, contactlessness. Load modulation method is a common strategy to transfer information from the secondary side to the primary side in a magnetic resonance coupling WPT system Using this control strategy, the power transfer and load voltage stability will be affected and the structure of demodulation module is complex. Based on SHEPWM control strategy, using a single full-bridge inverter can achieve power and forward information transfer without other high frequency signal sources. SYSTEM OVERVIEW Fig. 1 shows the circuit diagrams of the proposed simultaneous wireless information and power transfer (SWIPT) system This SWIPT system can be divided into two parts, the primary side and the secondary side. This WPT system can realize simultaneous wireless power and information transfer.
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