| 摘要 |
PURPOSE:To obtain insulation output circuits by using simple power sources by insulating between input, output and plural outputs with the plural secondary windings of the transformer connected with an input device to the primary winding as output circuits. CONSTITUTION:The AC from an AC power source 20 is rectified to DC voltage by a bridge circuit 21 formed by diodes, a smoothing condenser 22 and a transistor 24 conducted by the reference input through a Zener diode 23, whereby an insulation amplifier 25 to which control input is applied is driven. As a result, the primary winding 27 of a transformer is energized by way of a transistor 26 and the mutually insulated select signals are generated in the plural secondary windings 28... of the transformer without respectively using any power source circuits. These are then rectified by diodes 29, by which the supply voltages for driving insulation amplifiers for output signals are generated. Hence, a multiplicity of insulation output circuits may be incorporated on the same substrate by the simple constitution using the simple power sources. |
