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Abstract
Inductive power transfer (IPT) technology has been widely used in wireless charging applications due to its high efficiency, safety, and convenience. IPT system provides a contactless and efficient mechanism to transfer electrical power between a primary coil and a secondary coil, which are separated by a certain distance. One of the key challenges for IPT system is to maintain a constant voltage output under dynamic load conditions. This paper presents a study on the dynamic load regulation of an IPT system using a voltage feedback control loop. Simulation results show that the proposed control strategy can effectively regulate the output voltage of the IPT system under dynamic load conditions, and improve the system's stability and reliability.
Keywords: Inductive power transfer, dynamic load regulation, voltage feedback control, simulation.
Introduction
Inductive power transfer (IPT) system is a wireless power transfer technology that uses magnetic coupling to transfer electrical power between a primary coil and a secondary coil. IPT system has been widely used in various applications, such as electric vehicles, medical devices, and consumer electronics, due to its high efficiency, safety, and convenience. With the development of IPT technology, the demand for high-power IPT systems has been increasing in recent years. However, one of the key challenges for IPT system is to maintain a constant voltage output under dynamic load conditions.
The dynamic load regulation of IPT system is important for its application in real-world scenarios. For example, in an electric vehicle charging system, the load impedance can change significantly as the battery state-of-charge (SOC) changes, which can result in an unstable voltage output from the IPT system. In a medical device application, the load impedance can also change due to the patient's body condition, which can affect the device's performance and safety. Therefore, it is essential to develop a dynamic load regulation strategy for IPT system to ensure its stable operation under varying load conditions.
In this paper, we propose a voltage feedback control strategy for the dynamic load regulation of IPT system. The proposed control strategy uses a voltage feedback loop to regulate the output voltage of the IPT system based on the detected voltage at the load. The simulation results show that the proposed control strategy can effectively maintain a constant voltage output of the IPT system under dynamic load conditions, and improve the system's stability and reliability.
Dynamic Load Regulation of IPT System
The IPT system consists of two coils: a primary coil and a secondary coil. The primary coil is connected to a power source, and the secondary coil is connected to a load. A magnetic field is generated by the primary coil, which induces a voltage in the secondary coil. The power transfer efficiency depends on the coupling coefficient between the two coils, and the distance between the coils.
Under steady-state conditions, the output voltage of the IPT system can be easily regulated by adjusting the power source voltage or the load impedance. However, under dynamic load conditions, the load impedance can change significantly, which can result in an unstable voltage output from the IPT system. Therefore, the dynamic load regulation of IPT system is essential for its stable operation under varying load conditions.
Proposed Control Strategy for Dynamic Load Regulation
The proposed control strategy uses a voltage feedback loop to regulate the output voltage of the IPT system. The control algorithm consists of the following steps:
1. Detect the voltage at the load.
2. Compare the detected voltage with a reference voltage.
3. Adjust the power source voltage or the load impedance based on the comparison result.
4. Repeat the above steps until the output voltage of the IPT system reaches the desired value.
The voltage feedback loop is shown in Figure 1.
Figure 1. Voltage feedback loop for dynamic load regulation.
Simulation Results
The proposed control strategy was implemented and tested in MATLAB/Simulink environment. The simulation model of the IPT system is shown in Figure 2.
Figure 2. Simulation model of the IPT system.
The parameters of the IPT system are as follows:
Primary coil inductance: 20 uH
Secondary coil inductance: 50 uH
Coupling factor:
Load resistance: 10 ohms
Power source voltage: 100 V
The simulation was performed under three different load conditions: steady-state, step-change, and sinusoidal. The steady-state condition corresponds to a constant load impedance, while the step-change and sinusoidal conditions correspond to dynamic load conditions.
The simulation results are shown in Figures 3-5.
Figure 3. Output voltage under steady-state condition.
Figure 4. Output voltage under step-change load condition.
Figure 5. Output voltage under sinusoidal load condition.
Conclusion
In this paper, we proposed a voltage feedback control strategy for the dynamic load regulation of IPT system. The proposed control strategy uses a voltage feedback loop to regulate the output voltage of the IPT system based on the detected voltage at the load. The simulation results show that the proposed control strategy can effectively maintain a constant voltage output of the IPT system under dynamic load conditions, and improve the system's stability and reliability. The proposed control strategy can be used in various applications, such as electric vehicle charging systems and medical devices, which require dynamic load regulation of the IPT system.