## 6 Prototype Test
### Comparison  
Table 1 shows that there is a direct relationship between \(\Delta t_{on}\) and the critical voltage of \(V_{CE,max}\), as mentioned in Equations (7) and (10), for the inverter. Additionally, the measured waveforms clearly show the importance of the applied ZVS technique, as it prevented the additional stress and losses caused by switching. In addition, the equipment and components used to ensure and emphasize the repeatability and sustainability of this study are given in Table 2. Here, the details are kept confidential so as not to hinder future studies and for the patent application process. However, this information will be sufficient for researchers working on this subject because the original point here is the designed circuit and control software. To evaluate the feasibility and real operation of our prototype, we increased the input voltage of the device to 60 V by connecting two 30 V power sources in series, as shown in Figure 15. Then, we placed an iron piece on the spiral coil and observed the temperature changes as follows. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Figure** & \(\Delta t_{on}(\mu s)\) & \(T_{off}(\mu s)\) & \(V_{CE,peak}(\text{V})\) & **Load** \\ \hline
12 & 10 & 1000 & 90 & Without \\
14 & 10 & 100 & 80 & Present \\
13 & 20 & 24 & 125 & Without \\
15 & 20 & 24 & 120 & Present \\ \hline \hline \end{tabular}
\end{table} 
Table 1: IGBT critical voltage based on switching parameters. \begin{table}
\begin{tabular}{c c} \hline \hline
**Category** & **Equipment/Components** \\ \hline \hline \multirow{4}{*}{Quasi-resonant inverter} & Power MOSFETs and/or IGBTs \\  & Inductor and capacitor components for the \\  & & resonant circuit \\  & & Diodes for rectification \\  & STM32 microcontroller \\ Microcontroller unit (MCU) & Development board for STM32 \\  & & Shunt resistors for current sensing \\ Control system components & NTC thermistors for temperature monitoring \\  & & Voltage measurement circuits (operational \\  & & amplifiers for scaling) \\ Power supply & Adjustable DC power supply for inverter \\  & & testing \\ Load testing equipment & Resistive load bank or induction heating load \\  & & Oscilloscope for monitoring voltage and \\  & & current waveforms \\  & & Digital multimeter for voltage and current \\ Measurement instruments & & measurements \\  & & Temperature measurement system (digital \\  & & thermometer and data logger) \\ Calibration equipment & Calibration sources for voltage and current \\  & & Calibration standards for temperature sensors \\ Prototyping tools & & Breadboard and PCBs for circuit assembly \\  & & Soldering equipment and tools for circuit \\  & & assembly and modifications \\  & & Insulation resistance tester \\ Safety equipment & & Thermal imaging camera or infrared \\  & & thermometer for safety checks \\  & & Fume hood or ventilation for testing \\  & & potentially hazardous components \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Setup equipment and components. Once the device was turned on, we measured the temperature of the iron disk using a laser thermometer. As shown in Figure 16, the temperature of the iron piece increased by 34 degrees. The device also displayed the power of the system as 112 W, which accurately corresponds to the voltage and current drawn from the source. When the piece was removed from the coil, the device stopped, and the status indicator light turned blue, which indicates that the load presence procedure functioned correctly when the load was removed from the system. In the results shown in Sections 6.1 and 6.2, an academic study was carried out, especially focused on the thermal values of the laboratory setup, and the electrical efficiency of the proposed method is shown with successful results in parallel with the given literature examples. The output that should be mentioned here is the efficient result values in the loaded and unloaded results of the method used, and this is a result independent of the heater being next to it.