Control apparatus of injection molding machine

A control apparatus of an injection molding machine, the control apparatus comprising:

• a servo motor configured to drive an axis;
• a driving apparatus configured to drive the servo motor;
• a power supply converter configured to supply power to the driving apparatus after a voltage from a power supply is increased;
• an electric storage unit connected between the power supply converter and the driving apparatus, and
• a power supply converter controller configured to control the power supply converter, wherein
• a molding cycle is divided, depending on an operating state of the power supply converter, into
• a continuous operation interval of the power supply converter,
• a step-up interval of the power supply converter, the step-up interval being prior to the continuous operation interval, and
• an intermittent operation interval of the power supply converter, wherein the intermittent operation interval is an interval other than the continuous operation interval and the step-up interval,
• the molding cycle is a series of processes comprising
• a process of closing a mold,
• a process of injecting a molten resin into the mold,
• a process of measurement while melting a resin for a next molding cycle,
• a process of opening the mold, and
• a process of ejecting a molded product from the mold,
• the power supply converter controller is configured to supply ON/OFF commands to the power supply converter to
• operate the power supply converter to be turned ON continuously in the continuous operation interval,
• increase a voltage of the electric storage unit to a step-up voltage by operating the power supply converter to be turned ON in the step-up interval, and
• operate the power supply converter to be turned ON and OFF intermittently in the intermittent operation interval.