The invention relates to the technical field of real-time
simulation, and particularly discloses a
cascade H-bridge PET multi-device collaborative real-time
simulation method and
system based on an FPGA, and the method comprises the steps: positioning an
electrical connection point between a DC side
capacitor of each H-bridge unit and a DAB input interface in a PET
system, splitting the
system, and obtaining a three-phase
cascade H-bridge part and each phase DAB DC level; the main simulator side simulates a three-phase
cascade H-bridge part, adopts 3 * n groups of controlled current sources to be equivalent to a slave DAB
direct current level, and measures the
voltage vector at each controlled
current source end in real time; and the three slave simulators adopt each phase cascade H-bridge sub-module of n groups of controlled
voltage source equivalent hosts to synchronously measure the
current vector of the controlled
voltage source, and after
processing, bidirectional data interaction between the master and slave simulators is realized through optical fibers. According to the method, the contradiction between a large-scale cascaded H-bridge system and high-frequency switch
simulation is solved through heterogeneous step lengths, a
parallel simulation architecture and a flexible
signal receiving mechanism, and accurate real-time simulation of the cascaded H-bridge PET system is realized.