| 摘要 |
PURPOSE:To inexpensively reduce a noise insulating system for a DC power source in size by supplying the voltage of the power source from one equipment to an electronic circuit of the other equipment through a common mode choke, thereby eliminating the necessity of providing a transformer and a DC power source in each equipment. CONSTITUTION:The voltage of a DC power source to be supplied to an equipment 30 is converted by a power source 32 through a transformer 31 to a DC voltage, which is supplied to an electronic circuit 33 in the equipment 30. The voltage of the DC power source is supplied to common mode choke coil 34 and 35. The voltage of the DC power source which is insulated in a noise manner through the chokes 34, 35 is supplied to electronic circuits 41, 54 in the equipments 40, 50. The noise insulation of the signal between the equipments 30 and 40, 50 is performed through photocouplers 36, 37. |
