A 120 kHz high-frequency MOSFET charging circuit using series parallel resonant converter

This paper proposes a new circuit topology of high frequency switching DC-DC Series Parallel Loaded Resonant Converter (SPLRC) at 120 KHz. The circuit is used for a wireless power transmission application that requires a fast-charging operation. The purposed circuit that used a series parallel loaded technique is transformed into a different equivalent circuit for mathematical analysis that efficiently analyses the operation of the circuit in AC and DC modes. For each equivalent circuit, the operation is described and explained. A full detailed circuit calculation using Matlab R2018A is then carried out to determine the purpose converter components' value. Psim software is used to prove the model's validity further. Both computer-based simulations were used to capture the resulting waveform. Initially, the simulation result waveform is captured by using PSIM and then send to Matlab R2018A to plot better. The proposed circuit is fabricated based on the simulation result, and actual experimentation is made. Then a comparison between lab test results and simulations had been made to verify the accuracy of the proposed circuit operation. Furthermore, the targeted 600 W output power can be considered high for a lower voltage input of 24 V, thus, resulting in the resonant tank components value than available in the market. Therefore, the percent error between lab test and simulation is 2.6316% for voltage output. The lower value of output power produces more accurate results rather than the higher value of output power. Most of the components are using low-cost and commercially available in the market. All the finding is explained and discussed from the simulation result, it is confirmed that a high-frequency switching circuit is operated as expected.