and a charging and discharging control change unit configured to reduce any one or more of the charging voltage threshold value the discharging voltage threshold value and charging discharging impedance when the absolute value of the load power is less than the load power threshold value application_number US 201414759207 A description fig1 is a sectional view of a container section of a tire vulcanizer in a first embodiment of the invention fig2 is a plan cross sectional view of the container section of the tire vulcanizer in the first embodiment of the invention the tire vulcanizer 10 vulcanizes and molds an unvulcanized tire t the tire vulcanizer 10 in this embodiment vulcanizes the tire t in a posture in which an axis thereof faces an upward downward direction as illustrated in fig1 and 2 the tire vulcanizer 10 includes a mold 20 a container 30 that encapsulates the mold 20 and a mold heating device 100 the mold 20 includes a tread mold part 21 and a sidewall mold part 22 the tread mold part 21 forms a tread part and a shoulder part of the tire t the tread mold part 21 is split into a plurality of pieces in a circumferential direction of the tire t the sidewall mold part 22 forms a sidewall part of the tire t the sidewall mold parts 22 are respectively provided at the positions of both end edges of the tread mold part 21 in an upward downward direction the container 30 is provided on a lower heating plate 11 of the tire vulcanizer 10 the lower heating plate 11 forms an annular plate shape the container 30 includes a bottom plate 32 an upper disk 34 a segment.