The AC output from the space refrigeration controller will produce reflection ripple on the whole star bus,which will have a bad impact on the whole star distributor.To solve this problem,the traditional method is to reduce the amplitude of the reflection ripple on the bus through the choke.The disadvantage is that the choke increases the load.This paper proposes a software design scheme around this pain point:based on the impulse Equivalence principle,by synchronously generating unsigned sine waves and unsigned triangular carriers through parallel processes,the two generate SPWM waves through natural sampling.By sending remote control commands, the target phase is sent to the refrigeration controller.Through the constraint design of temporal logic,the remote control command count is double sampled to establish the correct timing mechanism.Nested algorithms are used to exit the timing mechanism and grasp the timing of outputting SPWM waves from zero,achieving precise adjustment of SPWM wave phase.When the SPWM wave phase difference between the two refrigeration controllers reaches 180°.The overall amplitude of the reflected ripple generated on the busbar is the smallest,which plays a role in suppressing the reflected ripple.Through simulation and experimental verification,this software design scheme can replace the choke to achieve the effect of suppressing the reflected ripple,thereby reducing the cost and the weight for the load.