Two-of-three ignition device for carrier rocket

The invention discloses a two-of-three ignition device for a carrier rocket. The two-of-three ignition device comprises three mutually independent ignition command path sets, wherein each ignition command path set comprises an ignition PLC and two contactors connected with the corresponding ignition PLC; output of the six contactors form a two-of-three ignition voting circuit; according to the two-of-three ignition voting circuit, one contactor of each ignition command path set is in series connection with the two contactors in other two ignition command path sets, and therefore three parallel ignition signal output channels are formed; the three parallel ignition signal output channels are respectively connected to an initiating explosive device of a primary engine of the carrier rocket. The two-of-three ignition device has the advantages that two-of-three redundant configuration of an ignition circuit is achieved; the possibilities that a single-point failure mode occurs and a command is sent by mistake are reduced, and the reliability of ignition action is improved; besides, the situation that ignition by mistake is caused due to a fault of a switching value signal detection device is prevented.