Wireless Power Transfer with Range Frequency 110 until 205 kHz
Concept
Wireless power transfer has become a frequently discussed topic in the process of technological development. Charging devices using wireless power transfer is implemented in some electronic devices such as power on handheld phone charging. The study designed a transmitter device system capable of generating power with the adjustment of the signal frequency 110 to 205 kHz through the transmitter system. Furthermore, the study was supported by the presence of transmitter and receiver devices in the form of a buckle to prove the output of the system as a power that corresponds to the input frequencies. The system is equipped with user input to set the frequency and display the output in the form of a user-readable display. The concept used is that the Power Width Module signal on an inlet system can set the input frequency value that will be used with the resource to obtain electricity. The transmitter coil will have the principle of electromagnetic induction which is a factor of the use of ferrites in capturing the electrical energy from an electrical resource that is converted into an electric field using a coil. Based on the tests carried out, the study produced a frequency output in the form of a box signal and observed power measurement results on the receiver. This research has the hope of being implemented for power transfer on drones and rover robots wirelessly.
Design
In supporting the system boundaries and connections between the systems studied can be viewed from the context of a diagram which provides a general overview of the system environment. The system consists of input, process, and output. The main focus of the author’s discussion is the use of GPIO pins on microcomputers to be able to use PWM values to set frequency values to be able to deliver power to the receiving device via the sending device using a coil.
Method
System software design is carried out using the Visual Studio Code application to enter the desired values, manage data, and produce the desired output. Enter values using buttons designed to integrate with the system display on the LCD. The frequency that has been entered will fall into the high or low frequency category depending on the coil used according to needs and can be done automatically by changing the programmed capacitor.
Depicts the run state which is the beginning of the connection of two self-events, namely push button up and push button down in setting the frequency. The wait state is entered when the push button is pressed and will perform a frequency scan or sweep. After sweep mode stops, it will enter an event that returns to the run state. In the system, output is also displayed through sensor readings when all system steps have been completed.
Implementation
The system that has been created from trial activities and tested for connection current is good, so the components are assembled together on a Printed Circuit Board (PCB) which is soldered and arranged so that the system is denser and neater. Results of the system framework that has been implemented on the PCB.
Experiment
The requirements needed in system design are as follows.
1. The system is capable of producing a box signal as output from the embedded system to the H-Bridge.
2. The system is capable of wireless power transfer in the frequency range of 110 to 205 kHz.
3. The system is capable of sending power to the receiver.
4. Users are able to increase and decrease the frequency.
Conclusion
Research has been carried out in signal generation by utilizing PWM in embedded systems for wireless power transfer with frequencies of 110 and 205 kHz. So, conclusions can be drawn based on the test results of the functional conditions which refer to the problem formulation, namely:
1. A box signal can be produced by the system as an output from the embedded system to the H-Bridge which is regulated by the duty cycle value via the PWM pin. The test was carried out to see the output form of the embedded system with an input frequency that had been set to the duty cycle value of the system to produce a stable square signal. Based on the test results, a square signal shape is obtained that corresponds to the input frequency.
2. Success in wireless power transfer research in the 110 kHz and 205 kHz frequency range can be seen from the form of the output frequency graph from the sending and receiving devices. In this research, frequency output testing was carried out after the system was embedded and after the receiving device. So, the results obtained from the test are that the box signal is capable of delivering a frequency that corresponds to the frequency value setting between 110 and 205 kHz from the receiver side in the form of an analog signal.
3. Success in sending power to the receiving device can be reviewed through testing the received power readings. Based on this test, it produces appropriate power readings between the sending device and the receiving device. This suitability is influenced by complex device factors and the presence of resonant frequencies which cause peaks in the graph of the data taken.
4. Frequency value settings can be adjusted based on input from the user using a button which is tested by observing changes in input when pressed. The results obtained during testing are that the button can increase frequency values and reduce frequency values, perform data scanning, and use coil types.
