Wireless electric energy transmission device

Abstract

The invention discloses a wireless electric energy transmission device which comprises a direct-current stabilized power supply, a full-bridge inverter circuit, a magnetic coupling resonance circuit,a semi-bridgeless active rectifier, a load device, a current sensor, a voltage sensor and a controller. The semi-bridgeless active rectifier comprises a first diode, a second diode, a fifth switchingtube, a sixth switching tube and a sixth capacitor, and the current sensor collects load output current; the voltage sensor collects load output voltage; and the controller controls the working statesof the fifth switching tube and the sixth switching tube according to the load output current and the load output voltage. The invention discloses a set of wireless electric energy transmission device suitable for a small-power electrical equipment charging occasion, which reduces the switching loss and conduction loss of a power device, is beneficial to model selection and heat dissipation processing of the power device, does not need to consider the synchronization problem of primary and secondary side control signals, and can wirelessly charge portable electronic equipment. The device hasthe advantages of compact structure, small size, light weight, low cost and the like.

Description

technical field [0001] The present invention relates to the technical field of wireless power transmission, in particular to a wireless power transmission device. Background technique [0002] At present, most electrical equipment obtains electrical energy from the grid through cables, but this physical connection is bound by "wires", which makes it inconvenient to use and is limited by the application. In recent years, under the trend of rapid development of applications such as unmanned driving, automatic parking, and electric vehicles, Wireless Power Transfer (WPT) technology has received more attention. This new technology of power electronics has the advantages of convenient use and high environmental adaptability, and can overcome the defects of sparks, wear and noise caused by traditional conductor contact power transmission. [0003] A widely used wireless power transmission device uses a full-bridge circuit on both the primary and secondary sides. This topology is ...

AI Technical Summary

Problems solved by technology

Since the primary side and the secondary side are two independent control systems, although the frequency accuracy of the digital signal processor (Digital Signal Processor, DSP) in the high resolution pulse width modulation mode (High Resolution Pulse Width Modulator, HRPWM) is relatively high, it can It achieves a frequency accuracy of 0.002% (TMS320F28335), but due to the high operating frequency of the system itself, a 100kHz control signal will generate a frequency deviation of 2Hz between the primary side and the secondary side, which will cause a periodic phase difference between the resonant voltages. The output current and output power will appear periodic oscillation, which is unacceptable for WPT systems that need to provide stable power for electrical equipment

At present, it is mainly through the introduction of external clocks or auxiliary equipment for synchronization, which is costly and requires additional signal conditioning circuits, and has high requirements for hardware and control algorithms.

In addition, in order to avoid the direct connection of the upper and lower power switches of the same bridge arm of the full-bridge circuit, it is necessary to add a dead time to the driving signal, which may cause the dead time effect, increase the switching loss, and affect the power quality and system stability.

At present, there are three main methods to solve the dead zone problem: dead zone effect minimization control, dead zone compensation control and no dead zone control, all of which are expensive

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