| Electrorheological fluids(ERF) have a good electro-mechanical property, they can be controlled easily just by changing the voltage applied on ERF, which makes it have potential and broad application in many fields. With development of study, ERF have aroused more and more attention. Recently, there are some ERF which have better properties, such as giant ERF, electrorheological elastomer and so on. The yield strength of giant ERF reaches 200KPa, the correlation between the shear strength and the control electric field are linear under some special conditions, which make it possible for practicing. In experiment, application and the intelligent control with other intelligent components of ERF, a high voltage power supply(HVPS) is needed. Therefore, to research a reliable and stable high voltage power supply whose voltage can be accurate adjusted in a wide range according to the external sensing signal is a problem to be solved urgently.This dissertation reviewed firstly the research status of high voltage power supply used in ERF, and summarized the characteristics of high voltage power supply applied to ERF by analyzing the equivalent circuit model and load characteristics of ERF. According to the actual situation, the digital signal processor (DSP) was chosen as the micro controller to realize the miniaturization, digital and intelligent, and then the key technology of high voltage power supply is analyzed. A design scheme which suit for full load was proposed, and the software and hardware were designed in detail. The hardware circuit mainly includes the rectifier filter, DC chopper and half-bridge inverter, the high voltage transformer with high frequency, detection and protection circuit. A high voltage transformer for half-bridge inverter circuit was designed; The main function of software is to change the Buck circuit's duty cycle of pulse width modulation(PWM) to realize voltage stabilization according to the output voltage feedback value, including sampling, incremental PID control,, PWM wave output, as well as the interrupt, etc.. In order to reduce the loss and the volume of the power supply, the switch control technology and soft switching technology were used in design. The half-bridge series and parallel resonant dual transform circuit which is more mature and higher reliability was chosen to realize soft switching. Detailed parameter design was given through computing and analyzing, and then using Matlab to do a simulation to simulate the rationality of computing, simulation results showed that the switch voltage become 0 at the time of opening, achieving zero voltage turn-on. Using Prote199se to generate the circuit board, and the wiring and anti-interference methods of circuit with high electric power and number power were introduced.The closed-loop simulation of main circuit was carried out by Matlab/Simulink power electronic simulation module. through simulation, the rationality of the parameters design was verified, and the parameters of the series parallel resonance and rectification were optimized. Using close-loop feedback, the power system got a quicker response. Then, the hardware circuit was built and debugged according to the computing and simulation results. The results showed that the computing, simulation and calculation results were basically the same, the parameter designs were resonable. By changing the setting value in software programming, the output voltage had good controllability, and realized the adjustability among 1-10KV. Through experiment, the circuit also had good performance of over current protection. |
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