CN205942322U - Based on energy -conserving hand warmer of singlechip safe and reliable - Google Patents

Abstract

The utility model discloses a based on energy -conserving hand warmer of singlechip safe and reliable. Including singlechip, minimum system, temperature measurement circuit, temperature display circuit, relay heating circuit, minimum system mainly includes two parts of reset circuit and crystal oscillator circuit, and minimum system links to each other with the singlechip and resets and provide the singlechip clock source, temperature sensor links to each other with singlechip IO mouth and transmits temperature information, the temperature display circuit links to each other with the singlechip and shows the temperature, relay heating circuit links to each other with the singlechip and controls heating circuit operating condition. This system can realize functions such as hand warmer heating, temperature setting, air defense fever, has improved security and energy -concerving and environment -protective nature.

Description

Based on single-chip microcomputer safe and reliable energy-conservation hand warmer

Technical field

The utility model belongs to Single-chip Controlling field, more particularly relates to one kind and is based on the safe and reliable energy-saving warm of single-chip microcomputer Hand is precious.

Background technology

With the development of human society, the progress of science and technology, the product of oneself is all sent out by industry-by-industry to intelligent, digitlization Exhibition., due to can not thoroughly cut off circuit, for the sake of security, during heating, people can not be away from for old-fashioned hand warmer, and electric leakage risk is big, And temperature after heating can be higher, easily causes scald, there is certain danger.Annual using hand warmer cause quick-fried Fried accident also has what is heard repeatly, make consumer hand warmer is nourished certain fear sense, the market so common hand warmer is faded out gradually. How to allow hand warmer is safer, more energy efficient, more intelligent, function is again mostly is the problem that we should think deeply, and therefore research safety can Hand warmer by energy-conservation has great importance.

Utility model content

1st, the purpose of this utility model.

The utility model is in order to solve the problems, such as that heating precious accident in prior art frequently occurs, and proposes one kind and be based on Single-chip microcomputer safe and reliable energy-conservation hand warmer.

2nd, the technical scheme that the utility model is adopted.

Based on single-chip microcomputer safe and reliable energy-conservation hand warmer, show including single-chip microcomputer, minimum system, temperature sensing circuit, temperature Show circuit, relay heater circuit；Minimum system mainly includes reset circuit and two parts of crystal oscillating circuit, minimum system and list Piece machine is connected and is resetted and provided Singlechip clock source；Temperature sensor is connected with single-chip I/O mouth and transmits temperature information；Temperature Degree display circuit is connected with single-chip microcomputer, and control signal, the P1.0-P1.7 of single-chip microcomputer are selected for position in the P3.3-P3.6 port of single-chip microcomputer Select control signal for section, four triodes drive group of four figures pipe respectively, the base stage of triode connects single-chip microcomputer P3.3- respectively P3.6 pin, the emitter stage of triode connects power supply VCC, and the colelctor electrode of triode connects the position choosing of charactron respectively by resistance End 1H-4H；Relay heater circuit is connected with single-chip microcomputer and controls heater circuit working condition.

Further, described relay heater circuit connects single-chip microcomputer, colelctor electrode by the base stage of triode by resistance Connect relay, Control heater circuit closes.

Further, also include sound light alarming circuit to be made up of buzzer, light emitting diode, be connected with single-chip microcomputer.

Further, also include keyboard K1-K4 circuit to be connected with single-chip microcomputer, K1 close for preset rated value, K2 and K3 is K1 rated temperature add-substract key；K4 is preventing dry combustion button.

Further, described single-chip microcomputer is STC89C52 type single-chip microcomputer.

Further, described crystal oscillating circuit adopts 12MHZ.

Further, described temperature sensor is DS18B20 temperature sensor.

Further, described triode is 8550 models.

Further, the default rated value of K1 closure is 30 DEG C.

3rd, the beneficial effects of the utility model.

The utility model passes through single-chip microcomputer bag minimum system circuit, temperature sensing circuit, temperature display circuit, sound and light alarm Circuit, relay heater circuit, key circuit etc., are capable of the heating function of hand warmer, temperature setting function, preventing dry combustion work( Can etc., improve intelligent, security and the environmental protection and energy saving of hand warmer.

Brief description

Fig. 1 is system construction drawing.

Fig. 2 is minimum system reset circuit figure.

Fig. 3 is minimum system crystal oscillating circuit figure.

Fig. 4 is system temperature testing circuit figure.

Fig. 5 is the temperature display circuit single chip part connection figure of charactron.

Fig. 6 is the bit driver circuit figure of charactron.

Fig. 7 is relay heater circuit figure.

Fig. 8 is sound light alarming circuit figure.

Fig. 9 is key circuit figure.

Specific embodiment

Embodiment

In order to improve intelligent, security and the energy-conserving and environment-protective of hand warmer, the utility model is with STC89C52 type single-chip microcomputer For control core, devise a safe and reliable energy-conservation hand warmer, system architecture diagram is as shown in Figure 1.This system adopts module Change design, mainly include single-chip microcomputer, minimum system circuit, temperature sensing circuit, temperature display circuit, sound light alarming circuit, continue Electrical equipment heater circuit and key circuit etc..

The basic structure of circuit：

1st, single-chip minimum system

The minimum system of single-chip microcomputer mainly includes reset circuit and two parts of crystal oscillating circuit, respectively as Fig. 2 and Fig. 3 institute Show.Reset circuit is divided into hand-reset and electrification reset two ways：Manual reset electro route power supply VCC in Fig. 2, resistance R4, button S1, resistance R5 are constituted, and when pressing S1, the reset terminal RST of single-chip microcomputer is high level, makes chip microcontroller reset work( Energy；Automatic reset electro route power supply VCC, polar capacitor C7, resistance R5 are constituted, and when single-chip microcomputer is upon power supply, makes RST For high level, this mainly uses the reset function to realize single-chip microcomputer for the characteristic that electric capacity both end voltage can not be mutated.Crystal oscillator electricity Road is to provide clock for single-chip microcomputer, and the minimum time measurement unit of single-chip microcomputer work is determined by this crystal oscillator, this reality Crystal oscillator with new middle selection 12MHZ.XTAL1 and XTAL2 in Fig. 3 is the clock crystal oscillator pin of single-chip microcomputer, and C8 and C14 is The load capacitance of crystal oscillator, OS1 is crystal oscillator, is operated in parallel resonance state.

2nd, temperature sensing circuit

In order to carry out the temperature survey of hand warmer, the utility model carrys out detection temperature from DS18B20 temperature sensor, should Device has the advantages that small volume, low in energy consumption, performance is high, strong antijamming capability, and it is output as digital quantity, can be sent directly into list Piece machine, can be cost-effective it is not necessary to amplify and analog to digital conversion circuit.Temperature sensing circuit is as shown in figure 4, P2.4 is single-chip microcomputer I/O port, single-chip microcomputer pass through this pin detection temperature.

3rd, temperature display circuit

The system carrys out displays temperature using group of four figures pipe, selects signal and position to select signal so needing logarithmic code pipe to carry out section Control, line position is entered using triode 8550 logarithmic code pipe and drives, the temperature display circuit of charactron is as shown in Figure 5 and Figure 6, single Control signal is selected for position in the P3.3-P3.6 port of piece machine, and single-chip microcomputer P1.0-P1.7 selects control signal for section in port.This practicality is new Type adopts the charactron of common-anode, so when P1.0-P1.7 is for low level signal, this segment numeral pipe is lit.Using positive-negative-positive Triode 8550 logarithmic code pipe enters line position and drives, and when P3.3-P3.6 is for low level, Q1-Q4 will be respectively turned on, the number being connected Code pipe position is strobed.

4th, relay heater circuit

When the temperature of hand warmer is less than setting value, hand warmer be heated, this is the basic function of hand warmer.Continue Electrical equipment heater circuit is as shown in Figure 7.It is less than set minimum temperature when DS18B20 detects temperature in the utility model When, single-chip microcomputer pin P3.7 be low level, triode Q5 turn on, relay coil obtain electric, adhesive K1 make heater circuit close open Begin to heat, D1 lights, and plays the effect of burner on light.When DS18B20 detects temperature and is higher than set maximum temperature, Single-chip microcomputer pin P3.7 is high level, and triode Q5 ends, relay coil dead electricity, and heater circuit disconnects, and hand warmer stops adding Heat.In detail in this figure it is contemplated that during relay coil power-off, produced inverse electromotive force is less, thus in the figure not plus Play the reverse fly-wheel diode of protection components and parts effect.

5th, sound light alarming circuit

When the temperature of hand warmer reaches higher limit, need to warn the owner of hand warmer, sound light alarming circuit such as Fig. 8 institute Show.When temperature reaches higher limit, single-chip microcomputer P1.3 exports low level, the triode V1 conducting of positive-negative-positive, buzzer warning；Simultaneously The luminous loop conducting being made up of VCC, R13, D8 and P1.3, makes light emitting diode D8 light, to user's warning.

6th, key circuit

In order to realize the temperature setting of safe and reliable energy-conservation hand warmer, temperature reset and preventing dry combustion function, design only As shown in figure 9, wherein K1 resets button for temperature, default temperature value is 30 DEG C to vertical keyboard circuit, and K2 is plus key, and K3 is Subtract key, K4 is preventing dry combustion button.When having button to press, P0.0 P0.4 is low level, otherwise for high level.

The purpose of setting preventing dry combustion button is to prevent hand warmer in heating because unattended or when pass into silence, In the case of not taking off power supply to hand warmer, hand warmer can cause the waste of electric energy, also can exist simultaneously because circulating-heating Potential safety hazard.So, in the design when hand warmer reaches the temperature value of setting, hand warmer will stop heating, until pressing Till key K4 is pressed, otherwise hand warmer will not be heated always.

In order to verify feasibility and the validity of safe and reliable energy-conservation hand warmer designed above, to designed system Carry out the welding of hardware circuit board.It is programmed using Keil C51 software development system in design, be capable of in design Each function, the temperature of display is 25.3 DEG C.

From experimental result as can be seen that the system propose safe and reliable energy-conservation hand warmer, it is possible to achieve heating function, temperature Degree setting function, preventing dry combustion function etc., can be good at improving practicality, security and the energy-conserving and environment-protective performance of hand warmer.

Claims (9)

1. a kind of based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Including single-chip microcomputer, minimum system, temperature inspection Slowdown monitoring circuit, temperature display circuit, relay heater circuit；Minimum system mainly includes reset circuit and two portions of crystal oscillating circuit Point, minimum system is connected with single-chip microcomputer and is resetted and provided Singlechip clock source；Temperature sensor is connected with single-chip I/O mouth Transmission temperature information；Temperature display circuit is connected with single-chip microcomputer, and single-chip microcomputer P3.3-P3.6 selects control signal, P1.0- for position in port P1.7 selects control signal for section in port, and four triodes drive group of four figures pipe respectively, and the base stage of triode passes through resistance respectively Connect single-chip microcomputer P3.3-P3.6 pin, the emitter stage of triode connects power supply VCC, and the colelctor electrode of triode connects number respectively End 1H-4H is selected in the position of pipe；Relay heater circuit is connected with single-chip microcomputer and controls heater circuit working condition.

2. according to claim 1 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Described relay Heater circuit connects single-chip microcomputer, collector connection relay, Control heater circuit by the base stage of triode by resistance Closure.

3. according to claim 1 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Also include acousto-optic report Alert circuit is made up of buzzer, light emitting diode, is connected with single-chip microcomputer.

4. according to claim 1 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Also include keyboard by Key K1-K4 circuit is connected with single-chip microcomputer, and K1 closes as presetting rated value, K2 and K3 is K1 rated temperature add-substract key；K4 is air defense Burn button.

5. according to claim 1 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Described single-chip microcomputer For STC89C52 type single-chip microcomputer.

6. according to claim 1 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Described crystal oscillator electricity Road adopts 12MHZ.

7. according to claim 1 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Described temperature passes Sensor is DS18B20 temperature sensor.

8. according to claim 1 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：Described triode For 8550 models.

9. according to claim 4 based on single-chip microcomputer safe and reliable energy-conservation hand warmer it is characterised in that：The default volume of K1 closure Definite value is 30 DEG C.