Multi-Objective Optimization Design of Interleaved Reconfigurable Electrosurgical Inverter with Trapezoidal Voltage Waveform

The electro surgical generator (ESG) is a high-frequency-voltage inverter that utilizes the current thermal effect to achieve the surgical therapeutic effect. Determined by the circuit topologies, sinusoidal and square waves are commonly utilized as the output voltage waveforms, which show certain disadvantages on wide-range voltage regulation. This paper studies the ESG with the trapezoidal voltage waveform, which has more control freedom degrees for voltage regulation, including the voltage amplitude as well as the rising and falling edge time. Therefore, it can reach a good balance between the total harmonic distortion (THD) and the voltage amplitude. This paper studies a multi-phase interleaved reconfigurable high-frequency-voltage inverter with the trapezoidal voltage waveform. To optimize the converter parameters and operation modes within the entire load range, a multi-obj ective optimization design method is proposed, which can optimize THD, current ripple and efficiency comprehensively. A 200V input and 200W output prototype was built in the laboratory, and the experimental results verify the feasibility of the proposed design method.