ELECTRO-HYDRAULIC SERVO VALVE CONTROL SYSTEM

摘要

A control system 100 includes an electro-hydraulic servo valve configured to move about a plurality of positions in response to receiving an analog bi-polar current signal. An electronic field programmable gate array (FPGA) 104 generates first and second digital pulse width modulation (PWM) signals according to an adjustable duty cycle. An electronic bridge circuit 106 is in electrical communication with the FPGA to convert the first and second digital PWM signals into the bi-polar current signal. An electronic current sensing circuit 110 is in electrical communication with the bridge circuit, the current sensing circuit 110 configured to generate a digital feedback signal indicating an average current level of the bi-polar signal. The FPGA controls the duty cycle based on at least the average current level indicated by the digital feedback signal.