JPS5835431A - Temperature detecting circuit - Google Patents

Abstract

PURPOSE:To obtain a high-precise temperature detecting circuit through a simple circuit, by a method wherein a subject circuit consists of an original signal generating circuit, having two oscillating signals, a reference signal generating circuit, and a counter. CONSTITUTION:An original signal generating circuit 1 consists of two oscillating circuits 11 and 12. The oscillating output of the first oscillating circuit 11 is transmitted to a reference signal generating circuit 2, a signal, produced by the circuit 2, counts the oscillating output of the second oscillating circuit 12 which has a comparatively wide change in frequency due to temperature, and temperature is detected from a change in number 6 of counts. If an output signal phi1 is brought to a ''1'', an output signal phi2 of the second oscillating circuit 12 produces a signal equivalent to an output signal phi3, the output signal phi3 is transmitted to only an output of an AND circuit G2, and an output signal phi4 counts down an updown counter 3. If the number of the pulses of the signal phi2 generated in case the signal phi1 is set to ''1'' is less than a given value, temperature detection is completed. This permits to obtain a high-precise detecting circuit through a simple circuit.

Description

[Detailed description of the invention] The present invention is a W*detection circuit that digitally detects temperature by comparing the difference in temperature coefficient.
More specifically, it is related to the temperature detection circuit because it detects the unique value of the counter and also detects whether the temperature is positive or negative.

Conventionally, the technology for temperature detection 11KII is expanded - using the m*centl of the end etc., detecting the tenor l amount of the resistance value of the t-mister, etc., and converting it into a simple m/f conversion, and converting the detected data into a digital quantity.
The main thing was to give out (l).

However, this person is I for small lll1 meter! The disadvantage is that it is very difficult to apply the coating and the IN change lll11 is very difficult, III! The accuracy and stability of detection is poor (if you try, the concave path will be complicated*), the power consumption will be very hot (-5), and the ninth circuit of M/F conversion will be ill. There are nine drawbacks.

The purpose of the present invention is to eliminate the drawbacks such as ζ, and to solve the problem by using the basic configuration of a starting path and a counter.
1 is simple, has high accuracy and long-term stability, and provides low power consumption temperature measurement.

Below, based on the examples, Honjitsu IJ! J! I will explain it in detail.The first wA is one of the actual embodiments.It is an example using a counter whose counting order changes before and after the initial setting value, and the generation circuit 1 consists of two oscillation circuits. The oscillation frequency of the first oscillation circuit U has a relatively small circumferential change due to temperature JIK, and the oscillation frequency change of the second Fine adjustment of the oscillation frequency of the oscillation circuit 11 and the iris is usually done with the trimmer landy.
The oscillation output of the first oscillator W111 is based on the power consumption of the electric power source, and the optical signal produced by the reference compensation generator 1 and 2 has a relatively large frequency change due to temperature - the second The oscillation output of the 1IIIWl path is detected, and *ii* is detected based on the change in the mold.

The detection data of ＠degree is outputted to the output 6 teeth of the cylindrical knob 7w 4 and the output 6 teeth of the cylindrical knob down counter 3.

Updown Karayuri 3 is from Standard II-I! The output signal of the kII circuit --- is connected to the main terminal of the output terminal IIIB.
K) The initial value is changed. Temperature detection is based on the standard 414# generation circuit 2 81s@bones a
When the state becomes 11#, it is turned off. Among them, the output lI4#φS of flipp µtub 4 is Nogo @ This occurrence II
This is because the output signal φ of 2 is set to 101 in the jIt period state.

The operation will be explained below, including the time chart in Figure 3.

The output signal φ of the output signal 111WIA of the rattan 2 becomes the output signal S1 in the -i'' state! Therefore, the output signal φ of the AND circuit G1 becomes aS.

The output No. 1 is the input signal of the AND circuit "a", and the AND circuit "a", but the output of the 71 tube 7w tube 4 @ oddφ
When the inn is in the 10" state and 1, the output signal φ$ is transmitted only to the output of the AND111&'), and the output signal φ is the same signal as the output signal S$. The number enters the met input of the up/down counter 3), step down!
As shown in the section of FIG. 2, the output signal φ! of the up/down counter 3 is increased to a constant value when the output signal φ! is changed to the 111 state. does not change and the temperature detection ends, so the output of the 11 degree detection data loop flip-flop p-tub 4 is 0. And step down! 3 output 6. is stored in

Next, let us assume that the number of pulses of output signal S1 is large due to the time K for which output signal φ1 is in the '1m state.If the number of pulses of output signal S1 is less than a certain value, then the same as in the case described above is obtained. However, when the number of pulses of the output value ◆φ is a constant value K, the second
Up/down counter 3 as shown in the section of 11φ)
Output @ life φ! - Instantaneous K"1- state. Output 41
Odd φv #'1'' type 11 sudden 7 lip flop 4 output signal ner changes from m01 to ``'' 1111 state,
When the output signal reaches the 11m state, the output signal φ- becomes 2
The F connection is not transmitted to the y input of the 3rd turn, but is transmitted to the 30 up input of the up/down counter (by the AND circuit). Then, the output signal φK is 101 soft Km and 1llI! Since the detection is completed, the output of the flap flap 4 is 0- and the output of the step-down column I3 is 0, as in the temperature test data company at this time.
*Because I don't remember Km1.

Now, No.-j)! ikli11M12F) Oscillation frequency temperature change - 2C't'19 meeting γ30
The amount of oscillation frequency change due to the temperature of the jilt is ignored, and the time in the power saving φ blade zero 11'' state is 1 second, and -m
℃~60'' ICK output signal pulse number per second a% As shown in m11,
The initial value of up/down counter 3 is 2G0061'C
− is set.

The temperature is m? The output of up/down counter 3 is 0. for! ! 00000 now 19ssoo-
zoo, 10m-shaped m is in the output 01 of Fu9y Puff 4
I can't remember it.

Next, when the temperature is 110°C and ii, 200106 pulses a are output to the output signal S3, so the number of pulses is 2.
00000fi is input to the down input of y-3, and the value of counter 3 becomes O, and the output signal is output from flip-flop 4. ner is in the 11″′ state.Output signal φ1
However, the signal to the down input of the up-down counter 3 is prohibited, and the remaining p 10 pulse signal is input to the down input of the down counter 3.
Therefore, Wen II! When the voltage is -10C, the output 03 of the counter/3 is set to 10.

Output 01 of clip 7a knob 4 is 100 +, @1
- and Il-, then temperature KsP at 4 of l11 is output 01, output 'tall! become that way.

12 Since the 10 of the output 01 of the counter I3 corresponds to 1°C, it becomes 1 if ioo is 10.0 and temperature detection with the 11th value of 0°C is possible.

As explained above, according to the present invention,
Road and counter! ! Since the 111 configuration enables detection of both positive and negative temperatures, it is possible to realize a stable Il variation detection circuit with low power consumption and high accuracy with a simple configuration. Also, the temperature measurement AI is done digitally,
Detection data processing 114 is easy.

No. ** is another embodiment of the present invention, in which the 1st step-down counter 3t down y cow/Meshu and Futupukakun 7I32
The counting hand R is changed before and after the initial scattering value.
Confucianism and Luwei in the case of change.

ms@! At i output signal φ・y),
Since the initialization of the counter value is interrupted, the 0m power 0. which is output to the output O of the l1m detection data, the output 04 of the aggregation counter/n, and the output 01 of the pump vy4. The output 0. Because it is determined by.

Wow, the detection generation circuit is amazing! The oscillation output of the second oscillation path is 4, and the second oscillation output is 1. It is also possible to divide the frequency by 1jK and make the large signal m-.

[Brief explanation of the drawing]

I1m, Figure 3 line &) in the embodiment of the present invention, Figure 3 company Figure 1 time chart 6I &). 16. , *'f1 generation circuit 11, , ll-10 source 1111M 12,, source ll11 circuit to l Tepuda 9:/Cowyri 4,,. 71 tsupufu n tsubu-506, puso set) WA% company 01. Down Count I Proverb 060th Street TupukauyI e,,G,,I,, 0th Street yFa Road G number. 0. Inverter or higher

Claims (1)

[Claims] The temperature coefficient of the oscillation cycle liquid number is JII &Runiku's IUI compensation, and the source signal generation circuit is made with one oscillation II @, and the other is made with control notes for oscillation compensation 4#. 414# The initial value is set by the generation a bribe and the control signal of the 1st preparation number generation am), and the *1 point hand #! At least %III with the counter that changes the meeting! '@fL1 Temperature ** m1 circuit to enable detection of positive and negative temperature and to make it a t4I image.