CN2101859U

CN2101859U - All electronic temp.-measuring and-controlling alarm

Info

Publication number: CN2101859U
Application number: CN 91220366
Authority: CN
Inventors: 陈长衡
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-09-19
Filing date: 1991-09-19
Publication date: 1992-04-15

Abstract

The utility model designs a middle-level, popular and safe all electronic temperature-measuring and-controlling alarm, which can be afforded by general individuals and departments. The temperature-measuring and-controlling alarm is mainly composed of a temperature-measuring circuit, a temperature-controlling circuit and a power supply circuit. The temperature-measuring and-controlling alarm is characterized in that I[1] is a CMOS two-input and four-NAND gate integrated block and is connected into an RS trigger; a diode D[5] is connected in parallel with an adjustable potentiometer W4 and is connected in series with a resistor R[2]. A luminous diode D[6] and a photoresistor D[5] are an optoelectronic isolator glued and sealed together, wherein, the negative end of the luminous diode D[6] is mutually connected with the collector electrode of a triode BG[2]; the positive end is connected with the 1 pin of the integrated block 317. The primary pole of a transformer is connected in series with a capacitor C4.

Description

All electronic temp.-measuring and-controlling alarm

Full-electronic measuring and controlling temp alarm is mainly used in the temperature survey temperature controlling of liquid, gas, solid and the usefulness of warning.In the device security protection of industrial and mining enterprises, the temperature of heating system is regulated automatically, and already wait in laboratory, rural culture all purposes widely, and it belongs to the electronic device class.

Domestic present electronic temperature control equipment kind is too dull, costs an arm and a leg, and general every price of digital temperature controller arrives more than thousands of units in hundreds of unit, and result of use and temperature control performance are all undesirable, and the user is difficult to accept.Low-grade inexpensive glass tube temperature controller has it self shortcoming, as: the glass cracky is dangerous, temperature that can not the observing and controlling solid, and the use field is subjected to certain restriction etc., and these factors have hindered the development of temperature control device in national economy and industrial and agricultural production.Comprehensive above reason, the top grade in greenhouse and low-grade between, filled up the vacancy of middle class, become popular style.Purpose is to allow general individual and unit afford the relieved of usefulness, and wishes to be accepted by various circles of society with superiority such as novel, of fine quality, inexpensive, multiple functional, and the temperature control field occupies one seat at home.

The purpose of this utility model then is the problem at above-mentioned existence, the top grade of temperature control and low-grade between, designed a kind of in class, the relieved full-electronic measuring and controlling temp alarm of usefulness is all afforded by popular, general individual and unit.

The utility model technical solution:

A kind of by temperature measurement circuit, temperature-adjusting circuit, the full-electronic measuring and controlling temp alarm that power circuit is formed, it is characterized in that two inputs, four Sheffer stroke gate A, B, C, D is connected into rest-set flip-flop, wherein input two pin of A door are associated on the cursor slide of adjustable potentiometer W2, diode D5 is in parallel with adjustable potentiometer W4, diode D5 connects with resistance R 2, photoresistance R5 is in parallel with resistance R 6, photoresistance R5 one termination 220V power end, the common male end of another termination capacitor C 5 and diac, light emitting diode D6 negative terminal links to each other with triode BG2 collector, 1 pin of positive termination integrated package 317, primary is connected with capacitor C 4.

The major advantage of this machine:

1, under the prerequisite of ensuring the quality of products, selects common electronic devices and components for use, reduced cost and cost (account price is only about 20 yuan).

2, circuit design is simple and direct exquisite, rationally distributed, whole aircraft reliability height, stable performance.

3, precision sensitivity height can replace glass mercury controller fully.

4, easy to use, have different probes, any occasion can both play a role, and does not have the trouble of any adjustment school examination, has accessory power outlet.

5, volume is small and exquisite, and is in light weight, easy to carry, and overall dimensions are 145 * 75 * 40mm, and weight is 200 grams.

6, this machine can become series of products alone, can expand to the temperature of the above different range of observing and controlling thousand degree, the digitizing new product.

Fig. 1 is the utility model electricity principle schematic.

Below in conjunction with accompanying drawing the utility model is further described:

(1) core of circuit: I1 is the integrated package of a CMOS two inputs four Sheffer stroke gate A, B, C, D, is connected into rest-set flip-flop.Temperature probe D1 is a diode that junction temperature is high, a top that is welded in hollow metal feeler lever, and D1 two is with in the lead junctor.Temperature measurement circuit is made up of semifixed resistor W1, diode D1, adjustable potentiometer W2, semifixed resistor W3.The A point of W2 is 0 ℃, and the C point is 100 ℃, is the temperature adjustable part between the AC, connects A door input end 1, the 2 continuous pin of potentiometer slider, as long as obtain the threshold voltage of 1V, just output terminal becomes low level by high level, makes the rest-set flip-flop upset.

If the pointer of potentiometer is on 90 ℃ of scale B points, diode D1 is subjected to the transformation temperature of measured body, the internal resistance of PN junction is reduced, the electric current that passes through also increases thereupon, finally make the B point voltage reach 1V, the A door is switched on (or shutoff), and circuit is action just, and the indicated value of pointer on scale is consistent with the actual temperature value that diode D1 measures.W1, W3 semifixed resistor are adjusted the usefulness of the scale of high-end low side respectively.

(2) the stable accuracy degree is up to standard: adopt temperature compensation act.Its principle is: transistorized enlargement factor B is directly proportional with temperature.

This task is finished by diode D5,317 is three-terminal voltage regulators, diode D5 is in parallel with adjustable resistance W4, after W4 sets up, output voltage is constant substantially, and diode D5 is really with the environment temperature size, and the internal resistance difference plays small automatic Regulation effect, compensate, resistance R 2 is connected with diode D5.

(3) thermometric is solved temperature control: C door, D gate output terminal have one high and one low two kinds of level to exist all the time, in case the circuit upset, D is that high C is low.The I1 carrying load ability is poor, needs to amplify through BG1, BG2, triode, and K1 is a working selecting switch, and after the rest-set flip-flop upset, BG1, BG2 get electric saturated, make I2 music-integrating block negativing ending grounding, send music alarm.Task after BG2 is saturated is that the D6 light emitting diode is got is electric shinny, light emitting diode D6, photoresistance R5 are the photoisolators that gummed is sealed, R5 is special for being applied in alternating current, after R5 obtains the light of D6, the resistance of photoresistance is K Ω by the M Ω prompt drop of dark space, make capacitor C 5 form pulse voltage, trigger the controllable silicon SCR conducting, export by the machine interpolation block.R6 is a shunt resistance, and capacitor C 6, resistance R 8 are absorption circuits, and purpose is to prevent that inductive load from damaging controllable silicon.

C4 is a decompression capacitor, and power supply is sent into the elementary winding of small transformers after step-down, and secondary winding connects bridge rectifier, obtains direct-current working volts, and with electric capacity C4 step-down, purpose is just processed with small transformers.R7 is a bleeder resistance, and C2 is the little electric capacity of 1 μ F and anti-interference effects of tool of photoisolator, avoids circuit erroneous action.

Claims

1, a kind of full-electronic measuring and controlling temp alarm of being made up of temperature measurement circuit, temperature-adjusting circuit, power circuit is characterized in that two inputs, four Sheffer stroke gate A, B, C, D are connected into rest-set flip-flop, and wherein input two pin of A door are associated in adjustable potentiometer W ₂Cursor slide on, diode D ₅W4 is in parallel with adjustable potentiometer, diode D ₅With resistance R ₂Series connection, photoresistance R ₅With resistance R ₆Parallel connection, photoresistance R ₅One termination 220V power end, another termination capacitor C ₅With the common male end of diac, light emitting diode D ₆Negative terminal and triode BG ₂Collector links to each other, 1 pin of positive termination integrated package 317, and primary is connected with capacitor C 4.