JPS60143731A - Temperature detecting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature sensing device having a plurality of thermistors.

Configuration of conventional example and its problems Conventionally, in a temperature sensing device having a plurality of thermistors, the temperature sensing method is based on the resistance value and resistance R shown in Fig. 1.
A voltage va or vb divided by A-RB-,
The information from the thermistor is detected as temperature data by comparing it with the staircase waveform formed by the temperature scan generator 3. However, if there are multiple thermistors, the temperature data signal for each thermistor is detected. The resistors RA-RB were required to form the same number of comparators 4 as the thermistors. Similarly,
Analyzers for analyzing these sensor data and performing actual temperature recognition were also required for the same number of sensors.

Therefore, in this method, as the number of sensors increases, the number of components required increases. Furthermore, it is clear that the seven-channel circuit configuration is a very wasteful circuit configuration because if the sensors are the same, there will be as many identical circuits as there are sensors. In addition, the presence of multiple identical circuits means that the errors and variations in each circuit have a very large effect on the detected data, and from the standpoint of reliability, it is difficult to invent A. Therefore, the present invention solves the above conventional problems and detects data from multiple temperature detection devices using only one basic circuit configuration, thereby reducing the number of parts and improving the accuracy of temperature detection. The purpose is to measure the

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a temperature sensing device having a plurality of temperature-sensitive resistance elements, and a set of temperature scans for making practical temperature judgments of the plurality of temperature-sensitive resistance elements. Generator, comparison device.

The analysis device is provided with a switching device that allows selection and switching to be performed on a time-sharing basis.

This configuration makes it possible to detect data from multiple temperature-sensitive resistive elements with just one basic circuit configuration, reducing the number of components and making decisions using the same circuit. Accuracy will be improved.

DESCRIPTION OF EMBODIMENTS The present invention will now be described with reference to the accompanying drawings showing one embodiment thereof.

In Figures 2 and 3, the thermistor devices that can detect temperature changes from changes in the reference voltage level by increasing or decreasing the resistance value corresponding to the temperature changes of the thermistors are resistors RA-RB and thermistors a and 1b. The voltage level of V changes in response to changes in the thermistor. In addition, since these two thermistors share the basic circuit RA-RB, a time-sharing detection method is used.In other words, a switching device is used to connect only one of the two thermistors. The operation is repeated at regular intervals by applying signals such as R1 and R2 in FIG. Further, this operation timing is synchronized with one round of the temperature scan waveform, and the voltage that is the temperature data of vp forms a voltage waveform based on this timing.

This is input to one of the comparators of the comparing device 4. On the other hand, a staircase waveform of the fourth rotational degree scan waveform is inputted from the temperature scan generator via a resistor.

This staircase level corresponds to the temperature data from the thermistor, and the output waveform data from the comparator 4 differs depending on the level. 11 in Figure 4 is
This is the output waveform of controller 4, but thermistor 1a
, 1b are tl and t in the T area.
This information is input into an analysis device and read out.

With this method, even if there are multiple thermistors, only one basic temperature detection circuit configuration is required.
Unlike the conventional case where the same circuit configuration is required for the number of thermistors, the input board (analysis device) corresponding to each thermistor can also be shared, which is very rational and reduces the number of parts, reducing costs. It turns out that it is also inexpensive, and its utility value is great.

Effects of the Invention As is clear from the above embodiments, the present invention has multiple tFIA
In a temperature detection device equipped with a switching device that changes and switches the I7''1-taste in a curved manner, the basic circuit configuration for temperature detection can be completed with just one thermistor regardless of the number of thermistors. In addition to significantly reducing the number of parts, temperature detection is performed using the same basic circuit configuration.
Errors and variations between multiple circuit configurations are eliminated, and more accurate detection is possible, which has great utility value. The figure is a timing chart of the same temperature detection device.

1a, 1b...Thermistor, 2...Switching device, 3...Temperature scan generator, 4...
... Comparison device, 5... Analysis device.

Claims (1)

[Claims] A sensor device having a plurality of thermistors, a switching device that selects and switches the plurality of thermistors in a time-sharing manner, a temperature scan generator that generates a seven-step waveform in which temperature is constituted by a voltage waveform, and A temperature detection device comprising a comparison device that compares temperature data converted into voltage from a sensor device, and an analysis device that detects temperature from the time-divided comparison data of a plurality of thermistors.