| 摘要 |
PURPOSE: To provide a CMOS-IC, including various input output devices by providing a current/voltage range decision amplifier circuit to a CMOS linear circuit and allowing an overcurrent circuit to conduct D/A modeling of a conductor temperature, so as to simulate a conductor temperature. CONSTITUTION: A current and voltage action of input channels 62, 64 is controlled by multiplexers MUX 66, 68 selected by the software. The channels 62, 64 receive a positive voltage of 0 to 2.5Vdc, which is fed to a variable gain amplifier 8 capable of automatic zero processing. The signals are processed in the automatic range decision mode or in the fixed gain mode, depending on the selection by the software. A power supply from an overcurrent circuit is obtained by a sensing load current or a circuit interrupter output. Since the overcurrent circuit includes both a digital base model and an analog base model, even when a power supply of the overcurrent circuit is lost, this circuit simulates a conductor temperature. As a result, the CMOS-IC, including various input output devices that convert an analog voltage current signal into a digital signal, is obtained. |
