JPH0161630U

JPH0161630U -

Info

Publication number: JPH0161630U
Application number: JP15716187U
Authority: JP
Priority date: 1987-10-14
Filing date: 1987-10-14
Publication date: 1989-04-19

Description

[Brief explanation of the drawing]

第１図は考案実施例のブロツク図、第２図は実
施例の動作説明図、第３図は従来のブロツク図、
第４図は従来の動作説明図である。図において、
Ａはサーミスタ印加電圧、Ｂはサーミスタ端子電
圧、Ｃはアンプ出力、Ｄはトリガ信号、Ｅはサン
プル・ホールド出力、Ｆはサーミスタ印加ノコギ
リ波、Ｇはサーミスタ直列抵抗電圧、Ｈはコンパ
レータ出力、Ｉはゲート信号、ＲＰはサーミスタ
並列抵抗、ＲＳはサーミスタ直列抵抗、Ｔはサー
ミスタ、１は方形波発生回路、２はアンプ、３は
サンプル・ホールド回路、４は温度表示回路、５
はノコギリ波発生回路、６はコンパレータ回路、
７はゲート信号発生回路、８はカウンタ、９は表
示回路である。なお図中同一符号は同一又は相当
部分を示す。 Fig. 1 is a block diagram of the invented embodiment, Fig. 2 is an explanatory diagram of the operation of the embodiment, Fig. 3 is a conventional block diagram,
FIG. 4 is an explanatory diagram of the conventional operation. In the figure,
A is the thermistor applied voltage, B is the thermistor terminal voltage, C is the amplifier output, D is the trigger signal, E is the sample/hold output, F is the sawtooth wave applied to the thermistor, G is the thermistor series resistance voltage, H is the comparator output, I is the Gate signal, RP is the thermistor parallel resistance, RS is the thermistor series resistance, T is the thermistor, 1 is the square wave generation circuit, 2 is the amplifier, 3 is the sample/hold circuit, 4 is the temperature display circuit, 5
is a sawtooth wave generation circuit, 6 is a comparator circuit,
7 is a gate signal generation circuit, 8 is a counter, and 9 is a display circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims

[Scope of utility model registration request]

A thermistor as a sensor used for temperature measurement, a sawtooth wave generation circuit that generates a sawtooth wave to be applied to the thermistor, a thermistor parallel resistance to ensure linearity of the thermistor's temperature characteristics, and a thermistor parallel resistance and thermistor parallel resistance. A thermistor series resistance that detects the parallel combined resistance of the resistors, a comparator circuit that compares and determines whether the voltage drop across the thermistor series resistance has reached a certain threshold level, the sawtooth wave generation circuit, and the start and stop of the counter. a thermistor comprising: a gate signal generating circuit that controls the output of the comparator circuit using the output of the comparator circuit; a counter that measures the time while the gate signal is being generated; and a display circuit that displays a temperature corresponding to the value of the counter. thermometer.