Design Of High Voltage DC Power Supply Applied To Electrorheological Fluids Experiment

ERF is a new smart soft material whose apparent viscosity and shear yield stress vary with the applied electric field intensity. Because the electrorheological effect of ERF can achieve rapid, reversible and stepless adjustment by controlling the size of the applied electric field strength, Therefore, the ER technology based on the ER effect has broad development prospects in many fields of vehicle engineering, aerospace engineering, biomedical engineering.In this paper, I mainly design a high-voltage DC power supply with the output voltage of 0?10 kV, maximum output power of 100 W and the ripple voltage of less than 1%, which can provide a controlled field for the experimental study of ERF. The power system uses a two-stage conversion architecture to achieve a widely adjustable output voltage. The Buck circuit DCM mode is established by the comparison of continuous and intermittent two different working conditions in the Buck circuit. The relationship curves between the voltage gain, the resonant capacitance and the frequency are deduced by the equivalent model established of the half-bridge series-parallel resonant converter circuit and the LCC resonance parameters are designed based on the graphs. On the basis of theoretical analysis, the Buck circuit, half-bridge inverter circuit, SG3525 driving circuit, TL494 drive circuit, voltage and current detecting circuit are designed and by optimizing the winding structure, the high-frequency transformer adopting the segmented structure is designed to reduce the effect of leakage inductance and distributed capacitance parameters on the performance of power supply. In order to achieve voltage and current sampling and digital control of high voltage DC power supply, the A/D, D/A conversion circuit, keyboard input circuit and LCD display circuit are designed in hardware and software based on 89C51 microcontroller.By the simulation of Saber software and testing on ERF sample, the high voltage DC power supply can be realized continuous adjustment within the purview of 0?10 kV by the microcontroller digital control and the power supply achieves a regulated output voltage with the maximum ripple 0.8% under closed-loop control. The half-bridge series-parallel resonant circuit achieves the ZVS of power switches. In conclusion, the performance of power supply is able to meet the needs of ERF experimental study.