Application Cases

With the continuous advancement of technology, wireless power transfer (WPT) has become a focal point of attention. WPT technology enables the wireless transmission of energy over long distances by utilizing electromagnetic waves for energy transfer and collection. It offers advantages such as high efficiency, environmental friendliness, and reliability, and holds broad application prospects in various fields, including electric vehicle charging, wireless charging devices, Internet of Things (IoT) devices, remote controls, sensors, and solar power generation.

The principle of WPT technology is based on the propagation of electromagnetic waves and the conversion of energy. The transmitter generates a varying current to produce electromagnetic waves, converting electrical energy into electromagnetic energy. The receiver captures these electromagnetic waves and converts them back into electrical energy. Power transfer efficiency during transmission is a critical metric, requiring optimization through appropriate frequency selection, power control, and attenuation/noise reduction measures. To achieve this, an external power source is often necessary to provide sufficient power for the system. The ATA-3090B power amplifier has proven effective in WPT testing, offering outstanding power performance with an output of 810 Wp, thereby providing robust driving support for WPT system testing.

In this article, Aigtek has compiled past customer cases and selected classic applications of the ATA-3090 power amplifier in dielectric research to share with you. We hope this will be beneficial to engineers and researchers in the field.

Case 1: Application of ATA-3090 Power Amplifier in Quasi-Constant Mutual Inductance Calculation and Optimization of Novel Coil Structures in Wireless Power Transfer Systems

Test Equipment:
ATA-3090 power amplifier, arbitrary waveform function generator, digital power analyzer, oscilloscope, 3D moving platform, transmitting coil, transmitting-side compensation capacitor, receiving coil, receiving-side compensation capacitor, and non-inductive load resistor.

Experiment Overview:
A prototype of a magnetically coupled resonant WPT (MCR-WPT) system and a WPT experimental platform were constructed. Starting from the optimized design of the coil structure itself, a novel coil structure with high horizontal misalignment tolerance was developed based on quasi-constant mutual inductance calculation and optimization methods. Without requiring additional resonant compensation networks or auxiliary control devices, this design significantly enhances the system's resistance to horizontal misalignment.

Case 2: Application of ATA-3090 Power Amplifier in Foreign Object Detection for Wireless Power Transfer

Test Equipment:
Inverter, resonant circuit, Tx coil, signal generator, ATA-3090 power amplifier, speaker, circuit breaker, etc.

Experiment Overview:
In a complete magnetic resonant WPT system, DC excitation is converted into a standard sinusoidal excitation through an inverter and resonant circuit, which is then applied to the Tx coil. The experiment simulated real-world conditions by directly applying sinusoidal excitation to the Tx coil.

Experimental Procedure:
The experimental system was set up, with sinusoidal excitation for the Tx coil generated by a combination of a signal generator and power amplifier. The feasibility of using a horizontally placed gradiometer for metal foreign object detection was verified first. A sinusoidal excitation current with a frequency of 100 kHz and an amplitude of 1.2 A was applied to the Tx coil. Finally, the feasibility of using a vertically placed gradiometer for detection was validated.

Case 3: Application of ATA-3090 Power Amplifier in Impedance Matching Research for Dynamic Wireless Power Transfer in Electric Vehicles

Test Equipment:
Signal generator, ATA-3090 power amplifier, transmitting coil, receiving coil, rectifier bridge, DC/DC converter and load resistor, oscilloscope, LCR impedance analyzer, Tektronix differential voltage probe, current probe, etc.

Experiment Overview:
Addressing the system mismatch issue during dynamic wireless charging for electric vehicles, the study focused on analyzing the causes of mismatch and restoring matching conditions. An impedance matching network with adaptive adjustment capabilities was embedded into the secondary circuit, enabling the electric vehicle to perform adaptive impedance matching adjustments based on current operating conditions, thereby stabilizing transmission efficiency under varying conditions. Grid power is converted into high-frequency AC through rectification and high-frequency inversion, generating a high-frequency magnetic field via the transmitting coil. When the receiving coil is within this magnetic field, it induces a current, transferring grid power from the primary to the secondary side. The energy captured on the secondary side is regulated by a rectifier and DC/DC converter before being delivered to the load.

Figure: Specifications of the ATA-3090C Power Amplifier