CN101236438A - Air conditioner temperature control intelligent electricity economizer - Google Patents

Abstract

The invention relates to an intelligent electricity economizer for controlling temperature of an air conditioning, comprising a power circuit, a controller connected with the power circuit and a relay output circuit connected with the controller. The invention is characterized in that: a temperature detecting circuit is connected with a difference module amplifying circuit which is connected with a microcontroller. The temperature detecting circuit comprises a resistance R1, a triode TL431 and a balanced bridge consisting of a platinum thermal resistance PT100 and variable resistors R2, R3 and R4, wherein, voltage signals which are formed by C point and D point of the balanced bridge directly proportional to temperature are sent to the difference module amplifying circuit. The intelligent electricity economizer for controlling temperature of an air conditioning has the advantages that: the temperature can be forcibly controlled toward a certain value through a calculation for automatically regulating; an intelligent control mode is adopted rather than a human intervention; the temperature can be automatically set toward a national specified standard temperature so as to both guarantee a comfort property and save electricity.

Description

Air conditioner temperature control intelligent electricity economizer

Technical field

The present invention relates to battery saving arrangement, be specifically related to a kind of air conditioner temperature control intelligent electricity economizer.

Background technology

Because air-conditioning has seasonality, intermittence, randomicity characteristics, caused the sequential fluctuation of electricity consumption curve, form the electric power peakload.And in recent years, along with the raising of living standards of the people, the air-conditioning market demand rapidly increases, annual newly-increased air-conditioning installed capacity near in addition surpassed the installed capacity of the new power plant construction same period.Along with a large amount of uses of air conditioner, air-conditioning power consumption has at present accounted for about 40% of electric power peak period load in summer in a lot of flourishing cities.The energy consumption that adopts reasonable manner to save air-conditioning can economize on resources, reduce operation of air conditioner expense, protection environment, and can avoid unnecessary power construction investment.

At present, the design temperature of most of air-conditioning and construction is 24-26 ℃, and air-conditioner temperature is controlled lowlyer in some utilities buildings, even is lower than 22 ℃, not only wastes energy, and comfortableness is very poor simultaneously.So, reasonably improve design temperature to air-conditioned room, can reduce on the one hand demand to the electric power peak load, on the other hand can the save electricity demand, can avoid in addition because low excessively uncomfortable property of bringing of air-conditioner temperature and problems such as " air conditioner diseases ".On June 1st, 2007, China's " State Council is about the air-conditioner temperature control criterion " regulation: the air-conditioner temperature in the utilities building must not be lower than 26 ℃ summer, though and winter, country did not stipulate to advise temperature, scientific research shows that the temperature of winter air-conditioning machine is suitable to be set in 16 to 18 ℃.Such temperature can warmingly can play to maximum efficiency certain energy-conserving action again.But most of unit does not carry out this regulation in real earnest, has caused the waste of the energy.

Summary of the invention

The purpose of this invention is to provide a kind of air conditioner temperature control intelligent electricity economizer, it can shut down when the environment temperature in summer is lower than the temperature of setting automatically, reset automatically when being higher than the temperature of setting, can when winter, environment temperature was higher than design temperature, shut down automatically again, reset automatically when being higher than the temperature of setting, and be not subjected to the artificial influence of controlling, thereby reduce unnecessary waste, saves energy.

Air conditioner temperature control intelligent electricity economizer described in the utility model, comprise power circuit, the controller that is connected with power circuit, the relay output circuit that is connected with controller, it is characterized in that: a temperature sensing circuit is connected with the differential mode amplifying circuit, the differential mode amplifying circuit is connected with microcontroller, and power circuit is connected with the differential mode amplifying circuit with temperature sensing circuit respectively.

Described air conditioner temperature control intelligent electricity economizer, its temperature sensing circuit comprises resistance R 1, triode TL431 and by platinum resistance thermometer sensor, PT100 and adjustable potentiometer R2, R3, R4 constitutes balanced bridge, the voltage signal that is directly proportional with temperature that the C point of balanced bridge and D point form is sent into the differential mode amplifying circuit.

R2, R3, R4 can regulate changes in resistance, and the change that the resistance of PT100 platinum resistance thermometer sensor, is directly proportional along with the rising of temperature is big, measurement range is-200～+ 650 ℃.The resistance of Pt100 type platinum resistance thermometer sensor, in the time of 0 ℃ is 100 Ω, resistance in the time of 200 ℃ is about 170 Ω, be that temperature rises 1 ℃, resistance 0.35 Ω that rises, the resistance of R4 adjustable potentiometer is 100 Ω, when the potentiometer resistance of PT100 and R4 is unequal, the voltage signal that is directly proportional with temperature that C point and D point form, send into the differential mode amplifying circuit of rear end and regulate, and reference power supply is provided by TL431, reference voltage is 2.5V, reference voltage balance electric bridge provide one can be for reference voltage signal, if environment temperature is χ ℃, C then, the voltage signal Vcd that D is 2 and the relational expression of the temperature difference are: $V_C=\frac{100}{{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="S2007100932561E00011.png"\; state="\{\{state\}\}">R</figure-callout>}}_2+100}\&times;2.5,$ $V_D=\frac{100+0.35x}{{\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="S2007100932561E00011.png"\; state="\{\{state\}\}">R</figure-callout>}}_3+100+0.35x}\&times;2.5,$ Because R ₃=R ₂=R, because 0.35x is very little with respect to denominator, so $V_D=\frac{100+0.35x}{R+100}\&times;2.5,$ Then $V_{\mathrm{DC}}=\frac{0.35x}{R+100}\&times;2.5$

Described air conditioner temperature control intelligent electricity economizer, its differential mode amplifying circuit comprise resistance R 5, R6, R7, R8, LM358 (operational amplifier), and R5, R6 are connected with temperature sensing circuit, the Vout end is connected with controller.

Described air conditioner temperature control intelligent electricity economizer, its controller comprises single-chip microcomputer C8051F300, its 3 pin is connected with power circuit, 9 pin are connected with the differential mode amplifying circuit, 2 pin are connected with the relay output circuit.

Described air conditioner temperature control intelligent electricity economizer, its relay output circuit is made up of transistor amplifier.Its function is in order to drive relay work and shutoff, and monolithic C8051F300 exports high level, becomes low level through inverter buffer, this moment, triode turn-offed, and the voltage of output is 0V, otherwise, if the single-chip microcomputer output low level, the voltage of then exporting 12V is to drive relay.

Described air conditioner temperature control intelligent electricity economizer, its power circuit provides stable power for controller, the used power supply of controller is taken to line voltage equally, by the special-purpose power supply chip of input behind the diode rectification, thereby the output galvanic current is pressed, the required voltage of control panel is+5V ,+3.3V, and+12V is provided by power circuit.Line voltage is imported through behind the transformer of 220V/15V, and through importing three-terminal voltage-stabilizing chip LM7812 by filter capacitor after the diode rectification, voltage stabilizing is output more afterwards, and wherein L1 is a power light, in order to detect the quality of power supply.3.3V the power supply architecture of 5V is the same, is used voltage stabilizing chip difference, is respectively LM1117-3.3, LM7805.

Advantage of the present invention is: adopt microcomputer control system, the collecting temperature signal is compared with reference temperature value in real time, automatically adjusts by calculating, and the temperature pressure is controlled near certain value; Adopt intelligent control method, do not need human intervention; Can be automatically temperature be set near the state specified standards temperature, have both guaranteed comfortableness, save electric energy again.

Description of drawings

Fig. 1 is the system hardware block diagram.

Fig. 2 is temperature sensing circuit figure.

Fig. 3 is the differential mode amplification circuit diagram.

Fig. 4 is a single-chip microcomputer and the pinouts that is connected of peripheral circuit.

Fig. 5 is relay drive circuit figure.

Fig. 6 is a power circuit diagram.

Fig. 7 is a main program flow chart.

Embodiment

Referring to Fig. 1, described air conditioner temperature control intelligent electricity economizer, the controller 2 that comprise power circuit 1, is connected, the relay output circuit 3 that is connected with controller with power circuit, temperature sensing circuit 4 is connected with differential mode amplifying circuit 5, the differential mode amplifying circuit is connected with controller, and power circuit is connected with the differential mode amplifying circuit with temperature sensing circuit respectively.

Referring to Fig. 2, temperature sensing circuit 4 comprises resistance R 1, triode TL431 and by platinum resistance thermometer sensor, PT100 and adjustable potentiometer R2, R3, and R4 constitutes balanced bridge, the voltage signal that is directly proportional with temperature that the C point of balanced bridge and D point form is sent into differential mode amplifying circuit 5.

Referring to Fig. 3, differential mode amplifying circuit 5 comprises resistance R 5, R6, R7, R8, LM358 (operational amplifier), and R5, R6 are connected with temperature sensing circuit 4, the Vout end is connected with controller 2; The effect of differential mode amplifying circuit is that voltage signal Vdc is amplified, and the differential mode amplifying circuit can suppress the common mode interference of signal effectively, guarantees the accurate of signal, wherein, and R ₇=R ₅, R ₈=R ₆, its amplification multiple is:

$M=\frac{R_7}{{\mathrm{<figure-callout\; id="5"\; label="R"\; filenames="S2007100932561E00011.png"\; state="\{\{state\}\}">R</figure-callout>}}_5}=\frac{R_8}{R_6}=k$ Doubly.

Be the output of differential mode amplifier $V_{\mathrm{out}}=k{V}_{\mathrm{dc}}=\frac{0.35x}{R+100}\&times;2.5\&times;k$

Referring to Fig. 4, controller 3 comprises single-chip microcomputer C8051F300 (manufacturing of Cygnal company), and its 3 pin is connected with power circuit 1,9 pin are connected with differential mode amplifying circuit 5,2 pin are connected with relay output circuit 3.

This controller carries 10 A/D ALT-CH alternate channel, has higher slewing rate and precision, and temperature influence is less, can guarantee precision for a long time, good reproducibility, and power consumption is lower, and has multiway analog switch, so it is more satisfactory for process control.The temperature signal input is the output signal Vout of differential mode amplifier, and single-chip microcomputer is judged the temperature of environment by it, and relay control signal outputs to relay drive circuit, with the break-make of pilot relay.C2DAT and C2CK are that program is downloaded mouth.

Referring to Fig. 5, relay output circuit 3 is made up of transistor amplifier.Its function is in order to drive relay work and shutoff, and monolithic C8051F300 exports high level, becomes low level through inverter buffer, this moment, triode turn-offed, and the voltage of output is 0V, otherwise, if the single-chip microcomputer output low level, the voltage of then exporting 12V is to drive relay.

Referring to Fig. 6, described air conditioner temperature control intelligent electricity economizer, power circuit 1 provides stable power for controller, the used power supply of controller is taken to line voltage equally, by the special-purpose power supply chip of input behind the diode rectification, thus output galvanic current pressure, and the required voltage of control panel is+5V, + 3.3V ,+12V is provided by power circuit.Line voltage is imported through behind the transformer of 220V/15V, and through importing three-terminal voltage-stabilizing chip LM7812 by filter capacitor after the diode rectification, voltage stabilizing is output more afterwards, and wherein L1 is a power light, in order to detect the quality of power supply.3.3V the power supply architecture of 5V is the same, is used voltage stabilizing chip difference, is respectively LM1117-3.3, LM7805.

Referring to Fig. 7, temperature signal that temperature sensing circuit of the present invention sends enters controller through the differential mode amplifying circuit of being made up of amplifier, through judging the break-make of outside relay after the software processes, thereby controls stopping and moving of air-conditioning.The advantage of air-conditioner controller.The present invention adopts microcomputer control system, and in real time the collecting temperature signal is compared with reference temperature value, automatically adjusts by calculating, and the temperature pressure is controlled near certain value.This control device adopts intelligent control method, does not need human intervention, can be automatically temperature be set near the state specified standards temperature.

In the design, adopt the mean value sampling, the theoretical peak-peak of final input a/d converter can not surpass the reference voltage value of single-chip microcomputer, so employing+3.3V is as reference voltage.At this moment, conversion accuracy is 3.22mV (3.3V/1024).Two main performance index mainly considering A/D converter here are slewing rate (Cinversion Rate) and conversion accuracy (Cinversion Accuracy).The slewing rate of A/D converter is meant that finishing an A/D changes the needed time, by its clock frequency decision.The clock frequency of the single-chip microcomputer C8051F300 that uses in this design is 25MHz, is 10kHz with its frequency division, because temperature signal is a direct current signal, for reducing error, gets the mean value of one in second as temperature signal T.

Requirement according to the user, air-conditioning production company can be suitable the lower-limit temperature value in setting summer and the ceiling temperature value in winter, controller is judged environment residing season according to the temperature value of the sampling of certain hour, if when the indoor temperature value of a period of time is lower than 20 ℃, be judged as winter mode, when the indoor temperature of a period of time is higher than 20 ℃, be judged as summer mode.When entering summer mode, when temperature was lower than 26 ℃, controller stopped the operation of air-conditioning, when temperature is higher than 28 ℃, controller startup air-conditioning, continue refrigeration.When temperature entered winter mode, when temperature was higher than 18 ℃, controller stopped the operation of air-conditioning, when temperature is lower than 16 ℃, controller startup air-conditioning, continue pyrogenicity.So, can make its temperature force to be set in certain value, and not be subjected to the influence of artificial design temperature.

After controller powers on, carry out the initialization operation of program, after the initialization success, A/D converter is started working, the temperature signal that sampling is outside, judge by environment temperature which kind of pattern controller is in, when temperature was lower than 20 ℃, controller was thought and is in the pattern in winter, under the winter pattern, when air conditioner surroundings temperature during greater than 18 ℃, controller stops the running of air-conditioning, when environment temperature during less than 16 ℃, controller is opened the running of air-conditioning, when temperature was higher than 20 ℃, controller was in the pattern in summer, under the summer pattern, when the air conditioner surroundings temperature is lower than 26 ℃, controller stops the running of air-conditioning, and when the air conditioner surroundings temperature was higher than 28 ℃, controller was opened operation of air conditioner.So move in circles and make that air-conditioner temperature is enforceable to be controlled near the setting value.

Claims (4)

1, air conditioner temperature control intelligent electricity economizer, the controller (2) that comprise power circuit (1), is connected, the relay output circuit (3) that is connected with controller with power circuit, it is characterized in that: a temperature sensing circuit (4) is connected with differential mode amplifying circuit (5), the differential mode amplifying circuit is connected with microcontroller, and power circuit is connected with the differential mode amplifying circuit with temperature sensing circuit respectively.

2, air conditioner temperature control intelligent electricity economizer according to claim 1, it is characterized in that: temperature sensing circuit (4) comprises resistance R 1, triode TL431 and by platinum resistance thermometer sensor, PT100 and adjustable potentiometer R2, R3, R4 constitutes balanced bridge, the voltage signal that is directly proportional with temperature that the C point of balanced bridge and D point form is sent into differential mode amplifying circuit (5).

3, air conditioner temperature control intelligent electricity economizer according to claim 1 is characterized in that: differential mode amplifying circuit (5) comprises resistance R 5, R6, R7, R8, LM358, and R5, R6 are connected with temperature sensing circuit (4), the Vout end is connected with controller (2).

4, air conditioner temperature control intelligent electricity economizer according to claim 1, it is characterized in that: controller (3) comprises single-chip microcomputer C8051F300, and its 3 pin is connected with power circuit (1), 9 pin are connected with differential mode amplifying circuit (5), 2 pin are connected with relay output circuit (3).

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