| 摘要 |
PURPOSE:To make it unnecessary to insulate the d.c. power source of a power circuit for a ground side and to variably adjust a dead zone width by connecting one edge of a power source, which supplies a current to the respective resistances of a reverse parallel circuit and gives a voltage drop to prescribed the dead zone width to the resistances, to the ground side. CONSTITUTION:Reversed polarity voltage equivalent to dead zone voltage in positive and negative directions for input voltage can be set, and the input voltage can be canceled by supplying the current to respective resistances R2 and R3 in conformity with the polarity of a reverse parallel circuit 3 and giving the voltage drop to the resistances from power circuits 4 and 5, and a supply current given to the resistances R2 and R3 at power circuits 4 and 5 sides is adjusted. Thus, the dead zone width can be adjusted variably. Further, the resistances R2 and R3 of the reverse parallel circuit 3 are connected to a zero-potential ground side, and the both edge output voltage of a load resistance is floated from the ground side. Consequently, d.c. power sources E1 and E2 of the power circuits 4 and 5, which supply the current to the respective resistances R2 and R3 of the reverse parallel circuit 3, can be grounded to the zero-potential and provided, the insulation of the power source can be unnecessary, and it can be shared with other control power source, etc. |
