Optimization of Temperature Rise Characteristics and Dynamic Performance of High-Speed ON/OFF Valve Based on Heat-Separated Driving Circuit

High-speed on/off valve (HSV) is widely used in aviation hydraulic systems due to its excellent response speed and load resistance. However, at high-frequency operating conditions, frequent power switching cycles with high voltages will lead to coil heating, which severely limits the performance of HSV. Reducing the temperature rise while ensuring fast response has been a significant challenge in this field. To address this issue, the heat-separated driving circuit (HSDC) is innovatively applied and optimized to HSV. By introducing an external resistor, HSDC not only reduces the temperature rise but also shortens the response time. To optimize the electrical parameters of HSDC, a multiphysics field model is established using the finite element method, and a multiobjective optimization is carried out. The Pareto front is obtained by NSGA-II algorithm and evaluated by EWM-TOPSIS method. Finally, comparative tests are conducted. The experimental results indicate that compared with the conventional coil driving circuit, the optimized HSDC can significantly improve temperature rise characteristics, reduce the maximum temperature rise by 75.21%, and shorten the time to reach the steady-state temperature by 29.71%. Moreover, the dynamic performance is also improved with a 4.90% reduction in total response time and a widening of the duty cycle adjustable range at low frequencies. These results validate the effectiveness of the proposed design and optimization scheme, demonstrating significant potential in reducing temperature rise and improving dynamic performance.