| 摘要 |
PURPOSE:To reduce the quantity of electricity to be supplied with a simple circuit by conducting current control by the 2-step changeover of the value of an initial flowing current and the value of an sustaining flowing current. CONSTITUTION:A sustaining current is supplied to a body to be protected from corrosion from a rectifying element 1 of a circuit having no switching function. A switch 3 of the circuit having a switching functon is worked according to the instruction of opening or closure designated by control circuit 6 with the potential 5 of the body inputted, and the body is supplied with a current from a rectifying element 2. Accordingly, when the potential 5 of the body exceeds previously set potential, half-wave rectified current 1i alone flows. When the potential 5 of the body is below the set value, currents are supplied from both the elements 1, 2, and a full-wave rectified current 1i, 2i flows through the body. |
