JPH05126649A - Temperature sensor identifying module - Google Patents

Abstract

PURPOSE:To identify the type of a sensor connected by connecting multiple inherent resistors in series for each temperature sensor, and connecting them in parallel with the sensor, and providing temperature sensor identifying elements having connection sections to the outside between the resistors. CONSTITUTION:The voltage inherent to the type of thermistors 1A, 1B is outputted to sensor identifying output terminals Dc1, Dc2 with the combination of voltage-dividing resistors R2A, R3A or R2B, R3B of module sections 2A, 2B combined with thermistors 1A, 1B respectively. The voltage is applied to a judgment section 4 through a multiplexer 8 and an A/D converter 6, the judgment section 4 judges the type of the module sections 2A, 2B, and it calculates the conversion factor between the detected value and the actual temperature corresponding to the thermistors 1A, 1B. A temperature arithmetic section 5 sets the conversion factor in response to the type of the thermistor. When the temperature is changed, the voltage on temperature detecting output terminals Dt1, Dt2 is changed, and it is inputted to the arithmetic section 5 through a multiplexer 9 and an A/D converter 7. The arithmetic section 5 calculates the temperature of a measured portion with the preset conversion factor and displays it on a display section 10 in response to the thermistors 1A, 1B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor identifying module in a temperature measuring device for measuring the temperature of a portion to be measured using a temperature sensor.

[0002]

2. Description of the Related Art Conventionally, in this type of temperature measuring apparatus, different types of temperature detecting elements are appropriately used as temperature sensors. Since the conversion coefficient with temperature is different, specify the type of temperature detection element to be applied in advance, or input the information about the type to the temperature calculation unit when the temperature detection element is connected. There was a need.

[0003]

However, in the above-mentioned temperature measuring device, there is a possibility that information about the type of the temperature detecting element may be forgotten to be input or may be erroneously set.
There is a problem that the detected value is not converted into accurate temperature information.

An object of the present invention is to provide a temperature sensor identification module which can contribute to conversion of temperature information by determining the type of the connected temperature sensor.

[0005]

In order to solve the above-mentioned problems, the invention of claim 1 applies a predetermined voltage between both ends of a temperature sensor, and energizes the both ends according to the temperature of a measured portion. In a temperature sensor identification module connected to the temperature sensor that changes a value in pairs, a plurality of current limiting elements having a value unique to each type of temperature sensor are connected in series. The temperature sensor identification element is provided which is connected in parallel with the temperature sensor and has a connection portion with the outside between the respective current limiting elements. According to the invention of claim 2, in place of the temperature sensor identifying element, there is provided a temperature sensor identifying element having a current limiting element having a value peculiar to the type of each temperature sensor and having one end connected to the outside. It was

[0006]

According to the invention of claim 1, since the voltage applied across the temperature sensor is divided by the current limiting elements into a voltage unique to each temperature sensor, the temperature sensor can be used. In the connected state, the type of the temperature sensor can be identified by measuring the potential of the connecting portion between the current limiting elements. According to the invention of claim 2, the type of the temperature sensor can be identified by measuring the resistance value or the like between both ends of the current limiting element while the temperature sensor is operably connected.

[0007]

1 is a block diagram of a temperature measuring apparatus having a temperature sensor identifying module according to a first embodiment of the present invention.

Numerals 1A and 1B are thermistors constituting a temperature sensor for detecting the temperature of the portion to be measured, and the resistances RtA and RtB between the both ends change depending on the temperature. 2A and 2B are the
In the module for identifying each temperature sensor used in combination with the misters 1A and 1B, the DC control voltage Vcc terminal is connected to one end of the thermistors 1A and 1B, and the ground potential GND terminal is connected. It is connected to the other ends of the thermistors 1A and 1B via a voltage dividing resistor R1A or R1B to form a current path for temperature detection, and a voltage dividing resistor R2A, R3A or between the Vcc terminal and the GND terminal. R2B and R3B are connected to form a current path for identifying the temperature sensor. Dt1 and Dt2 are temperature detection output terminals for extracting the potentials at the other ends of the thermistors 1A and 1B, and Dc1 and Dc2 are voltage dividing resistors R2A, R3A or R2B, R3B.
This is a temperature sensor identification output terminal for taking out the potential of the connection point between them. The resistors R2A, R3A, R2B, and R3B form elements for temperature sensor identification, and the mutual ratio of the respective resistance values that limit the current are set uniquely to the thermistors 1A and 1B.

Reference numeral 3 denotes a measuring device unit, a discriminating unit 4 for discriminating the type of a temperature sensor discriminating element by a common microcomputer, a temperature arithmetic unit 5 for computing the temperature of the measured portion, and a temperature sensor discriminating output. A / D voltage of terminals Dc1 and Dc2
A / D converter 6 for conversion and temperature detection output terminals Dt1, D
A / D converter 7 for A / D converting the voltage of t2, and each A / D converter
Multiplexers 8 and 9 for switching and connecting the temperature sensor identification output terminals Dc1 and Dc2 and the temperature detection output terminals Dt1 and Dt2 to the D converters 6 and 7 in real time, and the calculated receivers. It comprises a display unit 10 for displaying the temperature of the measuring unit, and a power supply unit 11 for supplying the power supply voltage and the control voltage Vcc of these respective units.

Next, the operation of the configuration shown in FIG. 1 will be described.

The voltage dividing resistors R2A, R3A or R of the module parts 2A, 2B which form a pair with the thermistors 1A, 1B.
Depending on the combination of 2B and R3B, the temperature sensor identification output terminal Dc1,
A voltage specific to the type of the thermistor 1A or 1B is output to Dc2. The respective voltages are sequentially sent out in real time to the A / D converter 6 by the multiplexer 8, converted into digital values and given to the discriminating section 4. The discriminating section 4 discriminates the type of the module sections 2A and 2B from the respective voltages, and calculates the respective conversion factors of the detected value corresponding to the thermistor 1A or 1B and the actual temperature. Temperature calculator 5
Is the thermistor 1A or 1B receiving the conversion factor.
The conversion coefficient is set according to the type of. When the temperature of the portion to be measured changes, the resistances RtA and RtB across the thermistors 1A and 1B change, and the voltages at the temperature detection output terminals Dt1 and Dt2 change accordingly. The respective voltages are sequentially sent to the A / D converter 7 by the multiplexer 9 in real time, converted into digital values, and the temperature calculation unit 5
Given to. The temperature calculation unit 5 calculates the temperature of the measured portion based on the respective voltages and the respective conversion factors set previously. The temperature is displayed on the display unit 10 in association with each thermistor 1A, 1B.

FIG. 2 is a block diagram of a module for identifying a temperature sensor showing a second embodiment of the present invention, the module portion of which is replaced by the module portion 2A or 2B of FIG. used.

1C is a thermistor similar to that shown in FIG. 2C is a module for temperature sensor identification which is used in combination with the thermistor 1C to form a current path for temperature detection with a voltage dividing resistor R1C similar to that in FIG. A series circuit of the piezoresistor R2C and the Zener diode ZD is connected between the Vcc terminal and the GND terminal to form a current path for identifying the temperature sensor. Voltage dividing resistor R2C
The Zener diode ZD and the Zener diode ZD form a temperature sensor identification element, and the Zener voltage of the Zener diode ZD is set uniquely to the type of the thermistor 1C. The mutual connection points are connected to the temperature sensor identification output terminal Dc.

In the configuration of FIG. 2, the Zener voltage of the Zener diode ZD is generated at the temperature sensor identification output terminal Dc. Therefore, the type of the thermistor 1C can be determined by detecting the Zener voltage.

FIG. 3 is a block diagram of a temperature measuring device having a temperature sensor identifying module according to a third embodiment of the present invention. In the figure, the same parts as those in FIG. 1 are designated by the same reference numerals, and different parts will be described below.

1D and 1E are thermistors similar to those in FIG. 2D and 2E are temperature sensor identification modules used in combination with thermistors 1D and 1E.
The voltage dividing resistors R1D and R1E similar to those in FIG. 1 are provided to form a current path for temperature detection, and the resistor R3 is connected to the GND terminal.
One ends of D and R3E are connected to form a current path for temperature sensor identification. Each of the resistors R3D and R3E constitutes a temperature sensor identification element and is set uniquely to the type of the thermistor 1D and 1E. The other end is the temperature sensor identification output terminal D
It is connected to c1 and Dc2.

A resistor R2 is connected to a signal line between the A / D converter 6 and the multiplexer 8 and receives a control voltage Vcc through the resistor R2, and the resistor R2 and the resistor R3D or R3E. Are connected in real time so that a current path for temperature sensor identification similar to that in FIG. 1 is sequentially formed. Therefore, as in FIG. 1, the types of the module parts 2D and 2E can be discriminated from the voltages of the temperature sensor identification output terminals Dc1 and Dc2. In the configuration of FIG. 3, the resistor R2 is independently connected between the temperature sensor identification output terminal Dc1 or Dc2 and the GND terminal, so that the configuration of the module parts 2D and 2E is simplified.

In the embodiment of FIG. 3, the resistor R3D or R3E is used to form the current path for identifying the temperature sensor. Instead of these, a capacitor is used to measure the charging time in each real time. You may do it. In this case, self-discharge is completed every real time by using a capacitor having a relatively small internal resistance.

[0019]

As described above, according to the present invention, the temperature sensor identification element having a unique value for each type of temperature sensor is combined with each temperature sensor.
By appropriately discriminating the temperature sensor identification element, it becomes possible to perform processing such as converting detection information by the temperature sensor into temperature information appropriate for the temperature sensor.

[Brief description of drawings]

FIG. 1 is a block diagram of a temperature measuring device having a temperature sensor identification module according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a temperature sensor identifying module showing a second embodiment of the present invention.

FIG. 3 is a block diagram of a temperature measuring device having a temperature sensor identifying module according to a third embodiment of the present invention.

[Explanation of symbols]

1A, 1B, 1C, 1D ... Thermistor, 2A, 2B, 2
C, 2D ... Module section, 4 ... Discrimination section, 5 ... Temperature calculation section, 6, 7 ... A / D converter, R2, R2A, R3A, R2B,
R3B, R3D, R3E ... Resistors.

Claims (2)

[Claims] 1. A temperature sensor for identifying a temperature sensor, which is connected to the temperature sensor in a pair with a temperature sensor that applies a predetermined voltage across the temperature sensor to change the energization value across the temperature sensor according to the temperature of the portion to be measured. In the module, a plurality of current limiting elements each having a value specific to the type of each temperature sensor is connected in series, and is connected in parallel with the temperature sensor. A temperature sensor identifying module, comprising: a temperature sensor identifying element having: 2. A temperature sensor for identification, which is connected in a pair with the temperature sensor for applying a predetermined voltage across the temperature sensor and changing the energization value across the temperature sensor according to the temperature of the portion to be measured. The module for temperature sensor identification is characterized in that the module is provided with a temperature sensor identification element having a current limiting element having a value unique to each type of temperature sensor and having one end connected to the outside. ..