To solve the following problem associated with conventional power supply circuits: to apply second direct-current voltage of DC 283 V to a control power supply generation circuit, a dedicated component comprised of a step-down transformer, a second rectifying circuit, and a second smoothing circuit is used and this increases a component cost.
A power supply circuit is so constructed that the following is implemented: a control power supply generation circuit 9 is connected in parallel with a first resistance element R1 of a voltage regulating circuit 4; and second direct-current voltage V2 obtained by dividing first direct-current voltage V1 through the first and second resistance elements R1, R2 of the voltage regulating circuit 4 is thereby applied to the control power supply generation circuit 9.
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Masahiro Taguchi