| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC voltage supply circuit of an electric servo drive injection molding machine which is capable of supplying two types of DC voltage, is a low cost, and does not cause waste electric power.SOLUTION: A DC voltage supply circuit is configured of a single PWM converter (4), a negative voltage line (N), first and second positive voltage lines (P1,P2), and a boosting/regenerating circuit (13). The first positive voltage line (P1) and the negative voltage line (N) are connected to an output side of the PWM converter (4). The boosting/regenerating circuit (13) is configured of two switch circuits (S1,S2) which connect the negative voltage line (N) and the second positive voltage line (P2) in series, and a reactor (14) which connects a middle point between the circuits with the first positive voltage line (P1). The switch circuits (S1,S2) are configured of transistors (T1,T2) and diodes (D1,D2), and the transistors (T1,T2) are provided so as to flow electric current in the direction from the second positive voltage line (P2) to the negative voltage line (N) when turned ON, and the diodes (D1,D2) are provided so as to flow electric current in the opposite direction. |
