JPS6338422U

JPS6338422U -

Info

Publication number: JPS6338422U
Application number: JP13218186U
Authority: JP
Priority date: 1986-08-29
Filing date: 1986-08-29
Publication date: 1988-03-12

Description

[Brief explanation of the drawing]

第１図は、この考案のＡＤ変換器の一実施例を
示す回路図、第２図は、第１図に示した中央処理
装置の動作を説明するためのフローチヤート、第
３図は、第１図に示した回路各部の信号波形図、
第４図は、入力アナログ信号と比較回路の検知周
期の関係を示す図、第５図は、従来のＡＤ変換器
を適用した抵抗測定回路の一例を示す回路図であ
る。２……ポテンシヨメータ、１１……ＡＤ変換器
、１２……充・放電回路、１３……比較回路、１
４……中央処理装置。 FIG. 1 is a circuit diagram showing an embodiment of the AD converter of this invention, FIG. 2 is a flowchart for explaining the operation of the central processing unit shown in FIG. 1, and FIG. Signal waveform diagram of each part of the circuit shown in Figure 1,
FIG. 4 is a diagram showing the relationship between the input analog signal and the detection period of the comparator circuit, and FIG. 5 is a circuit diagram showing an example of a resistance measuring circuit to which a conventional AD converter is applied. 2... Potentiometer, 11... AD converter, 12... Charge/discharge circuit, 13... Comparison circuit, 1
4...Central processing unit.

Claims

[Scope of utility model registration request]

A charging/discharging circuit that instantly discharges in response to an external command and charges with a time constant according to an input analog signal, and compares the output voltage of this charging/discharging circuit with a fixed reference voltage, and then calculates this reference voltage. a comparison circuit that detects that the output voltage of the charging/discharging circuit exceeds and outputs the voltage, and is operated by the detection output of this comparison circuit and supplies an external command to the charging/discharging circuit to instruct discharging; An AD converter comprising arithmetic means that outputs a count value of detection output per unit time as a digital output.