JPH01254823A - Digital temperature detecting device - Google Patents

Abstract

PURPOSE:To simplify a circuit by connecting in series the superconducting element having plural kinds of set critical temp. and combining in plural sets the means comparing the voltage dividing the voltage by using the plural elements as a resistance element by a reference voltage. CONSTITUTION:The superconducting element switching to superconducting and normalconducting states by a critical temp. is connected in parallel to resistances 121-137 and switches 101-114, the switches 101-114 are turned ON and show the state of zero resistance at less than the critical temp. and turned OFF to show the state of a resistance R at more than the critical temp. Now, the superconducting elements having different critical temp. are connected in series like the critical temp. of the superconducting element of switches 101 and 121, 102 and 122 being T0, T1 and a DC voltage is divided. When it is assumed that how to think of these critical temp. is T0<T1...<T6<T7, DELTAT< Tn-Tn-1: constant, the resistances 121-134 are a constant value R and a protection resistance is smaller compared with the value R, the voltage value of nodal points A-C varies against a temp. T. When this is compared with reference voltages A-C, the result that the temp. range of T0-(T7+DELTAT) is subjected to A/D conversion is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature detection device in a temperature value analysis or temperature control device.

BACKGROUND OF THE INVENTION Conventional temperature sensing devices include, for example, those using temperature sensors.

FIG. 2 shows a block diagram of this conventional temperature detection device, in which 1 is a temperature sensor, 2 is a sample and hold circuit, 3 is an A/D converter, and 4 is a microcomputer. The operations will be explained below in order.

(1) A temperature value is converted into a voltage value by a temperature sensor. This voltage value is not necessarily proportional to the temperature value.

(2) The signal converted into a voltage value by (1) is sent to the next stage A/
Sample and hold is performed for input to the D converter.

(3) A/D conversion is performed on the sampled and held signal using an A/D converter.

(4) The results of A/D conversion are taken into a microcomputer and various processes are performed. This processing also includes correction of nonlinearity of the one-quality sensor.

In the conventional temperature detection device configured as described above, since the temperature value signal detected by the temperature sensor is an analog voltage value, this signal is A/D converted and used for subsequent processing.

Problems to be Solved by the Invention However, in the above configuration, a sample-and-hold circuit and an A/D converter are required in order to convert the temperature value required in subsequent processing into a digital value. Furthermore, correction of nonlinearity of the temperature sensor becomes necessary in subsequent processing. As described above, conventional temperature detection devices have the problem of increasing the scale of the hardware and increasing the burden on the software.

In view of the above, it is an object of the present invention to provide a digital output temperature sensing device that is small in hardware scale and does not require correction of nonlinearity.

Means for Solving the Problems The present invention connects superconducting elements having several types of set critical temperatures in series, divides the voltage by using a plurality of these as resistance elements, and uses the divided voltage as a reference voltage. This is a temperature detection device configured to combine a plurality of sets of means for comparison.

Operation The present invention has the above-mentioned configuration, so that the divided voltage works to rise and fall depending on the temperature, and by comparing this with a reference voltage, it is converted into a digital signal, which is expressed in binary by using voltage dividers with different critical temperatures. It becomes possible to output each digit of .

Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a configuration diagram of a digital temperature sensing device of the present invention.

In Figure 1, a superconducting element that switches between a superconducting state and a normal conducting state depending on the critical temperature is represented as a resistor and a switch connected in parallel. Below the critical temperature, the switch turns on and the resistance becomes zero. , and above the critical temperature,
The switch is turned off, indicating the state of resistance R[Ω1. 101-1
Reference numeral 14 indicates a switch which is turned on when the superconducting state is present and turned off when it is not, and 121 to 134 indicate resistances when the superconducting state is present. 135-137 are protective resistors, 141-1
43 is a voltage comparator, and 151 is a DC voltage power supply.

The critical temperature of superconducting elements 101 and 121 is To.

The critical temperatures of the superconducting elements 102 and 122 are T2, so superconducting elements having different critical temperatures as shown in FIG. 1 are connected in series to divide the DC voltage. How to change these critical temperatures is To<TI<T2<T3<T4<T5<T6<T7ΔT
<Tn-Tn-+ 'If the constant resistances 121 to 134 are set to a constant value R and the protective resistance is set to be smaller than R, the voltage value at nodes A2, B2, and C in FIG. Changes as shown in Figure 3. If we compare this with reference voltages A, B, and C and output "1" for high voltage and "0" for low voltage, output A will output 2o and output B will output 21.
．． 2 for output C? A signal corresponding to the weight of T is output, and T
The result of A/D conversion of the temperature range from o to (T?+ΔT) is obtained.

However, a protective resistor or the like is set so that the current flowing through each superconducting element does not exceed the critical current of that element, and the reference voltage is set so that the voltage amplitude at each node can be compared.

Note that the critical temperature of each superconducting element can be adjusted by an external magnetic field.

Effects of the Invention As described above, according to the present invention, when a digital representation of a temperature value is required, an A/D converter is not required, and the circuit can be simplified. The linearity before and after converting values into digital values can be ensured at the design stage, and can be adjusted using an external magnetic field after fabrication, which has great practical value.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a temperature sensing device according to the present invention, FIG. 2 is a block diagram of a conventional temperature sensing device, and FIGS. 3(a) to (C) are temperatures T at nodes A-C in FIG. FIG. 2 is a characteristic diagram showing voltage changes due to 101-114... Switch, 121-137.
...Resistance, 141-143...Comparator,
151...DC voltage source. Name of agent: Patent attorney Toshio Nakao and 1 other person 10/~/
14-Opening/closing Shinobi/2f-/37--Coffin 141-143-Ichillion Hakuhaku, /-11, Ensemble 2-11 Sumbul Hold Circuit 3--10 Con-ha'-G4- Microcon Upper 9 Acre Figure 2 12'4

Claims (1)

[Claims] By connecting multiple superconducting elements with several types of set critical temperatures in series, using multiple superconducting elements as resistance elements to divide the voltage, and comparing the divided voltages using a reference voltage, multiple sets of means are combined. , a digital temperature detection device that outputs temperature values digitally.