CN2234086Y

CN2234086Y - Luminous electronic thermometer

Info

Publication number: CN2234086Y
Application number: CN 95227451
Authority: CN
Inventors: 胡宇平
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-30
Filing date: 1995-11-30
Publication date: 1996-08-28
Anticipated expiration: 2005-11-30

Abstract

The utility model relates to a luminous electronic thermometer, which is composed of a regulated power supply, a temperature sensor, an amplifying circuit, an LED level meter driver, an LED level meter display, a supporting body, etc. The number of luminous LEDs is used for indicating temperature. The utility model has the characteristics of visual and clear display, easy reading, and the combination of practicality and artistry. The utility model is also a novel lamp decoration and can beautify living rooms and environment.

Description

A kind of luminous electronic thermometer

The utility model relates to a kind of thermometer, particularly a kind of luminous electronic thermometer.

Traditional glass thermometer is fragile, and scale is intensive, when reading difficulty, especially light are dark.Digital electronic thermometer external form dullness is stiff, obscures easily between numeral.The existing scheme that adopts light emitting diode (hereinafter to be referred as LED) to make scale, each LED represents 2 ℃, even 5 ℃, precision is low, the practical value branch.

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art, provide a kind of each LED represent Celsius thermometric scale once or Fahrenheit thermometric scale once, reading easily, visual clear display, melt practicality and artistry in the luminous electronic thermometer of one, it is again a decorations, has the double action of beautifying living environment.

The purpose of this utility model can reach by following measure: it includes supporting mass [9], stabilized voltage supply [1], temperature sensor [4], supporting mass is provided with electronic circuit board in [9], electronic circuit board is provided with secondary mu balanced circuit [2], reference voltage circuit [3], constant-current source circuit [5], amplifying circuit [6], electronic circuit board joins with feeder line and temperature sensor [4], stabilized voltage supply [1] is joined by feed line and electronic circuit board, it is characterized in that: also be provided with each LED on the supporting mass and represent that Celsius thermometric scale once or Fahrenheit thermometric scale LED decibel meter display [8] once, also is provided with on the electronic circuit board linearly according to the luminous LED decibel meter driver [7] of the output voltage values driving LED of amplifier [6].

Above-mentioned said supporting mass [9] is a picture frame, and the front of picture frame [9] is provided with the photo of Paris Eiffel Tower or the background painting [10] of picture printed matter.

The LED of above-mentioned said display can sequentially per 5 be considered as one group, in the group with the LED that sends out same color light, between two adjacent groups with the LED that sends out different colours light.

The voltage that stabilivolt D produces in the secondary mu balanced circuit [2] export one the tunnel with reference voltage circuit [3] in R2-1, R2-P joins, 4 of the middle integrated circuit (IC) 2 of another road and LED decibel meter driver [7], 8 pin join, also have one the tunnel with amplifying circuit [6] in feedback resistance R10 join, R4-1 in the reference voltage circuit [3], the switched pins K1 of R4-P and switch [12], KP joins, the fixedly pin K0 of switch [12] and the input resistance R9 in the amplifying circuit join, the input resistance R11 of the other end of the R5 of temperature sensor [4] and amplifying circuit [6] joins, each integrated circuit (IC) 2 in 6 pin of the integrated circuit (IC) 1 in the amplifying circuit [6] and the LED decibel meter driver [7], 5 pin of ICP+1 join, IC2 in the LED decibel meter driver [7], 1 pin of ICP+1,10-18 pin respectively connect the negative pole of a LED, their 3, the positive pole of 9 pin and stabilized voltage supply [1] joins, 6 pin and 7 pin join after resistance R 13, RP+12 and power supply ground join, 6 of IC2,4 of 7 pin and IC3,8 pin join, 6 of 1C2+i, 4 of 7 pin and IC3+i, 8 pin link to each other, join with the base stage of T1 after the collector of the T2 of constant-current source circuit [5] and base stage are joined, collector and the temperature sensor of T1 join.

Above-mentioned said temperature sensor is the copper thermistor sensor, the LED of LED decibel meter display is 40, the integrated circuit of corresponding LED decibel meter driver is 4 LM3914, also is provided with the switch [12] with measurement range conversion between interval (20 ℃～+ 20 ℃) and interval (+10 ℃～+ 50 ℃) on the supporting mass.

The temperature sensor of electronic thermometer is transformed into a certain size voltage or current signal with the height of temperature, through suitable amplification or again after mould-transformation of variables, shows for instrument or display.Pointer instrument adds scale with pointer indicates, and digital instrument shows with numeral.Magnitude of voltage after the utility model adopts LED decibel meter driver according to amplification is driving LED decibel meter display linearly, comes the displays temperature value with the quantity (adding the initial value of this temperature section) of luminous LED.

According to the performance of used temperature sensor, measurement instrument, display etc., can determine the enlargement factor of required amplifier, the dynamic range of output and the parameters such as voltage of stabilized voltage supply.Because the difference of selected circuit, components and parts, these parameters can have many different combinations.

The copper thermistor sensor has good linearity, stable and reliable for performance, advantages such as cost is low, easy making, uses other type temperature sensor more worthwhile at normal temperature scope measurement temperature, room temperature ratio.

Obviously, in this programme, the type of temperature sensor has been determined the measurement range of maximum possible, for different request for utilizations, determines the measurement range of the reality of thermometer.This scope represents that with M M is big more, and the quantity L of used LED is big more, and then corresponding driving device quantity F is also big more, and power consumption increases simultaneously, and cost improves.Therefore normal measurement range with reality is divided into P section, and the size of each section is equal to or less than the quantity L that shows with LED.Between each section overlapping can be arranged, but interruption can not be arranged.There is the K switch of P switched pins to come conversion to measure section with one.Following relation: P 〉=[M/L] or P 〉=[M/L]+1 is arranged between them, F 〉=[L/n] or F 〉=[L/n]+1, (in the formula: 1. [X] represents the integer of X, 2. if aliquot is then used formula [M/L], [L/n] if aliquant, then uses [M/L]+1, [L/n]+1,3. n is the quantity of the every driver LED that can drive).P reference voltage, P bar reference voltage branch road should be arranged mutually, and adopt the switch that P switched pins arranged.

The utility model has following advantage than prior art:

1. the temperature clear display is accurate, very easily offers an explanation reading;

2. avoided the misjudgment that causes because of profile is close between numeral;

3. have degree of precision, practical, applied widely, can be used for family, school, hotel, station, harbour, also can be used for refrigerator, freezer, warehouse etc.

4. having overcome the dull stiff deficiency of existing all kinds of thermometer moulding, is again the very strong decorations of a kind of practicality, can play the effect of room, decoration, environment.

5. technology maturation, starting material are easy to get, and particularly copper thermistor sensor cost is low, and performance is good, easily makes.

Fig. 1 is a functional-block diagram of the present utility model;

Fig. 2 is the appearance structure synoptic diagram of the utility model embodiment;

Fig. 3 is electrical schematic diagram of the present utility model (embodiment).

The utility model is described in further detail below in conjunction with accompanying drawing:

With reference to Fig. 1, Fig. 2, the utility model is made up of stabilized voltage supply 1, secondary mu balanced circuit 2, reference voltage circuit 3, temperature sensor 4, constant-current source circuit 5, amplifying circuit 6, LED decibel meter driver 7, LED decibel meter display B, supporting mass 9, background Figure 10, LED11, switch 12 etc.

Supporting mass adopts the picture-frame type structure among the embodiment, hereinafter to be referred as picture frame 9, its front have powerful connections picture 10, LED11 is installed, switch 12 is equipped with in the bottom of picture frame, picture frame inside is provided with electronic circuit board, temperature sensor is arranged on the edge or the back side of picture frame, also can separate with picture frame and places the ventilation.

Embodiment: this example adopts copper thermistor to make temperature sensor, and display is directly served as with 40 LED, and each LED represents 1 ℃ Celsius.Measurement range is elected as-20 ℃～+ 50 ℃, be divided into two sections :-20 ℃～+ 20 ℃ ,+10 ℃～+ 50 ℃, adopt switch to select.Supporting mass is a picture frame.

With reference to Fig. 3, the secondary mu balanced circuit is made up of resistance R 1, stabilivolt D; Reference voltage circuit has two separate branches, route resistance R 2-1, potentiometer R3-1, resistance R 4-1 formation of connecting, another route resistance R 2-2, potentiometer R3-2, the resistance R 4-2 formation of connecting; R3-1 and R3-2 are used for regulating the initial temperature value corresponding reference voltage of two temperature sections respectively; Resistance R 5 is the copper thermistor sensor; Constant-current source circuit is made up of transistor T1, T2, resistance R 6, R7, R8 etc.; Amplifying circuit is formed differential amplifier by integrated transporting discharging IC1 (as LM741), resistance R 9, R10, R11, R12 etc., and voltage amplification factor A=R10/R9=30 doubly; LED decibel meter display directly is made of 40 LED that are arranged on the picture frame; Integrated circuit (IC) 2, IC3, IC4, IC5 (LM3914) resistance R 13 peripheral with it, R14, R15, R16 etc. constitute LED decibel meter driver, and they are cascaded into the strip display mode, and their output terminal respectively connects the negative pole of a LED.

Real work is right, the R4-1 of reference voltage circuit or R4-2 provide reference voltage V1 through switch to the R9 of differential amplifier circuit, copper thermistor R5 provides voltage V2 to the R11 of differential amplifier circuit under the driving of continuous current, V3=V2-V1 input difference amplifying circuit is enlarged into voltage V4, send V4 to the 5th pin of IC2～IC5 go to control LED bright, go out.The regulating circuit parameter makes the quantity of luminous LED add that the initial value of this temperature section is the measured temperature value.

Claims

1. luminous electronic thermometer, comprise supporting mass [9], stabilized voltage supply [1], temperature sensor [4], supporting mass is provided with electronic circuit board in [9], electronic circuit board is provided with secondary mu balanced circuit [2], reference voltage circuit [3], constant-current source circuit [5], amplifying circuit [6], electronic circuit board joins with feeder line and temperature sensor [4], stabilized voltage supply [1] is joined by feed line and electronic circuit board, it is characterized in that: also be provided with each LED on the supporting mass and represent that Celsius thermometric scale once or Fahrenheit thermometric scale LED decibel meter display [8] once, also is provided with on the electronic circuit board linearly according to the luminous LED decibel meter driver [7] of the output voltage values driving LED of amplifier [6].

2. luminous electronic thermometer according to claim 1 is characterized in that: above-mentioned said supporting mass [9] is a picture frame, and the front of picture frame [9] is provided with the photo of Paris Eiffel Tower or the background painting [10] of picture printed matter.

3. luminous electronic thermometer according to claim 1 is characterized in that: the LED of above-mentioned said display can sequentially per 5 be considered as one group, in the group with the LED that sends out same color light, between two adjacent groups with the LED that sends out different colours light.

4. luminous electronic thermometer according to claim 1, its feature is as follows: the voltage that stabilivolt D produces in the secondary mu balanced circuit [2] export one the tunnel with reference voltage circuit [3] in R2-1, R2-P joins, 4 of the middle integrated circuit (IC) 2 of another road and LED decibel meter driver [7], 8 pin join, also have one the tunnel with amplifying circuit [6] in feedback resistance R10 join, R4-1 in the reference voltage circuit [3], the switched pins K1 of R4-P and switch [12], KP joins, the fixedly pin K0 of switch [12] and the input resistance R9 in the amplifying circuit join, the input resistance R11 of the other end of the R5 of temperature sensor [4] and amplifying circuit [6] joins, each integrated circuit (IC) 2 in 6 pin of the integrated circuit (IC) 1 in the amplifying circuit [6] and the LED decibel meter driver [7], 5 pin of ICP+1 join, IC2 in the LED decibel meter driver [7], 1 pin of ICP+1,10～18 pin respectively connect the negative pole of a LED, their 3, the positive pole of 9 pin and stabilized voltage supply [1] joins, 6 pin and 7 pin join after resistance R 13, RP+12 and power supply ground join, 6 of IC2,4 of 7 pin and IC3,8 pin join, 6 of IC2+1,4 of 7 pin and IC3+i, 8 pin link to each other, join with the base stage of T1 after the collector of the T2 of constant-current source circuit [5] and base stage are joined, collector and the temperature sensor of T1 join.

5. luminous electronic thermometer according to claim 1, it is characterized in that: above-mentioned said temperature sensor is the copper thermistor sensor, the LED of LED decibel meter display is 40, the integrated circuit of corresponding LED decibel meter driver is 4 LM3914, also is provided with the switch [12] with measurement range conversion between interval (20 ℃～+ 20 ℃) and interval (+10 ℃～+ 50 ℃) on the supporting mass.