JPS5896976A - Indicator for temperature of low-temperature showcase, etc. - 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]

The present invention relates to displaying the internal temperature of a low-temperature cabinet, etc., and aims to accurately display the internal temperature and to effectively utilize a light emitting diode element. Conventionally, there are digital displays and analog displays as temperature display means, but most of them are digital displays that display the temperature inside the refrigerator using numbers or the like. -There is a storage temperature range for food items stored in Jiro cases, and if the internal temperature is within that storage temperature range, there is no need to display the internal temperature numerically; it is simply that the internal temperature is within the storage temperature range. All you have to do is judge whether the storage temperature is at an appropriate temperature or an abnormal temperature. When displaying the internal temperature using a diode (hereinafter referred to as LID), it is necessary to check the number of lit LIDs, and also
The work of attaching the ID to the showcase becomes complicated and the attachment location is also limited. Furthermore, there is a difference in lifespan between an LID that emits light all the time and an LID that hardly emits light, and the lifespan of an LID that always emits light is short. The present invention has been made in view of the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to the drawings. Figure 11!1 is an electrical circuit diagram. (1) is a DC power supply that supplies power via the bus (B). 12) is a temperature detection circuit, and the bus bar (
A) and the busbar (B). 181 resistance (
A series circuit of R1) and a temperature sensor (S) such as a thermistor, and a series circuit of a $2 resistor (R2), a first variable resistor (R4), and a second variable resistor C*;t. It consists of a bridge circuit. The temperature sensor CB) is installed in the showcase, for example near the cold air outlet, and its impedance decreases as the temperature increases. (31 is a first operational amplifier (hereinafter referred to as the first amplifier) and a second operational amplifier.

[This is an amplifier circuit consisting of a 51, hereinafter referred to as the 1!2 amplifier. $1 Noah 77' The (-) input side of 141 and the (+) input side of @2 amplifier (51) are connected to the midpoint of @1 resistor (R4) and temperature sensor 7 (S). , the (10) input side of the first amplifier (4) is connected to the midpoint between the second resistor (5) and the first variable resistor (R1), and the second amplifier (5)
The Q barf input side is connected to the midpoint between the @1 variable resistor (R; J and the second variable resistor (R'2). Furthermore, the (+] side input of the 181 amplifier (4) voltage, and the (-) input voltage of the second amplifier (5) is the 1st.ml!
2 variable resistors (R:) (R;). or. The (+) input voltages of the $1 amplifier (4) and the (-) input voltages of the $11!2 amplifier (5) are @1. 2nd variable 5℃~10℃ and higher @1 amplifier (4)
The input voltage of t+ is higher than the (-) side voltage of this amplifier (, the (+) input voltage of the second amplifier (51) is lower than the (-) side input voltage of this amplifier, and the internal temperature is appropriate When within the range of i!1.2nd amplifier + 41151 (10)
If the side input voltage is higher than each (-) input voltage and the internal temperature is lower than the appropriate temperature, the (+) of the first amplifier (4)
The side large input voltage (-) is lower than the side input voltage (, and the (+) input voltage of the amplifier (5) of @2 is set in advance so that it is higher than the (-J input voltage. 6) is a light emitting diode lighting circuit *(Dl) is the first light emitting diode (hereinafter referred to as LID of 181), which connects the bus line (AJ to the sixth resistor (R3) and the fourth resistor (R4)
) is connected with the midpoint direction as the forward direction, and emits green light when energized. (D2) is a second light emitting diode (hereinafter referred to as second LID) and is connected from the bus bar to the fifth resistor FCCR5).
and the sixth resistor (R6) with the midpoint direction as the forward direction, and emits red light when energized. In addition, 1st. second L
mD (D,) (D2J is a single L-recommended element (as shown in Figure 11F2), which is incorporated into the DJ, and the emitted light color of the DJ changes depending on the respective light emission. (QJ is an NPM transistor (hereinafter! r], and its base is iJ!1
A diode (D; via J to the first Q) is connected to the output side of the amplifier (4) via a second diode (Dl2) to l! 2
are connected to the output side of the amplifier (5) with the output side direction being the forward direction, and are connected to the bus line (AJ) via a resistor (R7) of $7. Also, the collectors are W!, 3. It is connected to the output side of the amplifier (4) of $1 through the fourth resistor (R,) (R4) and the third diode (D), and
! 5. Connected to the output side of the second amplifier (51) via the resistor CR5) CH2 of 11!6 and the fourth diode (D:). Also, the diode CD' of @5.$4) (
D4) are respectively 1st and 1st. The output side direction of the second amplifier +41+51 is connected as the forward direction. Also, Tr(q)
The emitter of is directed toward the bus line (8) with the bus line direction being the forward direction. It is connected to the bus line CB) via a fifth diode (D s' ) for satisfying the OF'F condition of Tr (Q). The operation will be explained below based on the electrical circuit diagram shown in Figure @1. For example, if the compressor of the cooling system breaks down and the temperature inside the refrigerator gradually rises and exceeds the appropriate temperature limit of 10°C, the impedance of the temperature sensor (i9) decreases and the IJ! The (+) input voltages of the first amplifier (4) are higher than the (-) input voltages, and the (10) input voltages of the second amplifier (51) are lower than the (-) input voltages. The output voltage of amplifier 1 (4) becomes a high potential (hereinafter referred to as rHJ), and furthermore, the output voltage of amplifier 11!2 (5)
The output voltage of is a low potential (hereinafter referred to as rLJ and T). The base of the gate (Q) is the output "L" of @2's amplifier (5;
The voltage is low due to the voltage, and the terminal (Q) is turned off. Therefore, wi's LID (D,) is the first amplifier (4)
Since the output is rHJ and Tr(Q) is 02F, no current flows and no green light is emitted. On the other hand, current flows from the bus (A) to the @2 amplifier (51) via the second LID (D2), the fifth resistor (R5), and the @4 diode (D4), so the @2 LID ( D2) emits red light. Therefore, T and the LID element (D) display red high temperature. As the cooling operation resumes, the temperature inside the refrigerator gradually decreases and the temperature of the temperature sensor <8) also decreases. The impedance gradually increases.When the temperature inside the refrigerator reaches t@
When the water temperature drops below 10℃ and falls within the appropriate temperature range, the impedance of the temperature sensor (S) increases, so the first amplifier (4) remains unchanged and its (+) input voltage becomes (-).
higher than the input voltage, the (10) side input voltage of the amplifier (5) of 1[2] becomes higher than its (-) side input voltage. Therefore, the first amplifier (4) maintains the output rHJ, @ The output of the second amplifier (5) becomes "H", and the first and second diodes CD') (D;) are reverse biased, and ?r(Q)G is the seventh resistor (R7). The base current flows through the circuit and turns ON.The collector voltage decreases.Also, the 181.$2 amplifier (
4) The output rHJ of +5J is $5. The fourth diode (D
3) Reverse bias (D'4). Therefore, the current is the mother @
(A) to $1 LID (D, J and fourth resistor (R4)
It flows through the bus (AJ) through the LID (D2) of '@2 and the resistor (R6) of lI6 to the collector of ?r(Q). The light flows to the bus bar (B) via the diode (D;), and the second LID (D.) CD,) emits green and red light, respectively. On the other hand, if the temperature sensor that controls the operation of the compressor fails and the compressor continues to operate, the temperature of the temperature sensor (S) will decrease as the temperature inside the refrigerator decreases. The impedance further increases.When the temperature inside the refrigerator falls below 5℃ between the lower limits of the appropriate temperature range, the temperature sensor Cf
Due to the rise in the type pressure between both terminals of the first amplifier (4), the (10) side input voltage of the first amplifier (4) becomes lower than the (-) side input voltage, and @
The amplifier (4) of Ill has an output rLJ, and !
The base of r(Q) is drawn to the output rLJ of the amplifier (4) of @1 via the diode (D, ) of $1, and becomes a low potential.
Dl) and 183 resistors M, (R,) and the fifth diode (
A current flows to the first amplifier (4) via D2J, and the first LID (D', ) emits green light. on the other hand,! ! ! 2 amplifier (51 maintains the output rHJ, but
! -(Q) is OF Fl/Jj: Me, 2nd (FJL
M D (D2 month) No current flows and no red light is emitted. Therefore, the L!iD element (D) displays a low temperature in green 4°. On the other hand, the compressor stops operating and the temperature inside the refrigerator decreases. When the temperature rises, the operation opposite to the above is performed, and as the temperature inside the refrigerator rises, the LID element (D) switches from the green low temperature display to the orange appropriate temperature display. When the temperature is low, the LID element (DJ emits red light, when the temperature is within the appropriate temperature range it emits orange light, and when the temperature is low it emits green light. The display operation is as shown in Figure 6. There is no need to approach the display each time to check the temperature inside the refrigerator and read the numbers when the temperature is displayed numerically.
Even if you are far from the itD element (CD), as long as you can determine the color of the emitted light, you can determine whether the temperature inside the -RG iron is in the A temperature range, high temperature, or low temperature. Also, multiple LB
Compared to when using D and determining the temperature inside the refrigerator based on the number of lights lit, it is not necessary to confirm the number of lights turned on and the temperature inside the refrigerator can be determined instantly in the same way as above. On the other hand, L
Since a warm display is performed with one ID element (D), the installation work is simplified and the installation location is not limited. Furthermore, when the internal temperature is at an appropriate temperature for a longer period of time than when it is high or low temperature @1. Because the second LID (D, J (D2)) emit light simultaneously and emit orange color, which is a mixture of green and red, the difference in lifespan between the second LID (DI) (D2) is $1. It almost never happens (LED element (DJ
1. LIID that emits green light when configured so that, for example, green light indicates low temperature, red light indicates appropriate temperature, and mixed color orange indicates high temperature. When the light emission fails, the appropriate temperature is displayed in red even though the temperature inside the refrigerator is high, but in this example, the green light indicates low temperature, the red light indicates high temperature, and the orange light indicates the appropriate temperature. To do so. For example, if the first LID (D, λ) that emits green light fails to emit light, the temperature display will stop or a red high temperature display will be displayed, and the appropriate temperature will not be displayed even though the temperature inside the refrigerator is high. As described above, the present invention provides a temperature display device that detects the internal temperature of a low-temperature sea case and displays the temperature by emitting light from one light emitting diode.
In addition, it is equipped with a light emitting diode element that emits the amber color of the two primary colors, and one primary color indicates a high temperature, the other primary color indicates a low temperature, and a mixed color of both indicates an appropriate temperature. It is possible to instantly and accurately determine whether the temperature inside the refrigerator is low or high, or the appropriate temperature. In addition, by emitting light of a plurality of primary colors simultaneously, it is possible to display an appropriate temperature with the longest display time, so that the life expectancy of the light emitting diodes can be balanced and the light emitting diode elements can be used effectively. Furthermore, since the light-emitting diode element includes a plurality of light-emitting diodes, the installation work is simplified and is not limited by the installation location.

[Brief explanation of drawings]

Figure 1 is an electric circuit diagram, Figure 2 is a light emitting diode (11.
...DC power supply, (2)...IT detection circuit, (SJ...
・Temperature sensor, (R; t(R; shi) 1st. $2 variable resistor, (31... amplifier circuit, (4) (5)... $1
, second operational amplifier m, (6+...light emitting diode lighting circuit, CD,)(D2)...+lJ1. @2 light emitting diode, (D]... light emitting diode element, (Q)...
...Transistor. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Low-temperature switching - detecting the temperature inside the case, etc. A temperature display device that displays temperature by emitting light from a light emitting diode includes a light emitting diode element that emits at least two primary colors and a mixture of the two primary colors, and one primary color is used at a high temperature while the other A temperature display device for a low-temperature showcase, etc., which is characterized by displaying a low temperature in primary colors and indicating an appropriate temperature in a mixed color of both.