CN204330169U - Temperature sampling device and telepilot - Google Patents

Abstract

The utility model belongs to field of household appliances, particularly relates to a kind of temperature sampling device and adopts the domestic electrical equipment remote controller of this temperature sampling device.Micro-processor MCV in the utility model is respectively output high level, low level or input state by arranging two I/O port, respectively charging and discharging is carried out to electric capacity, and record time t1 and t2 of electric capacity by reference resistance R1 and thermistor RT electric discharge respectively, the resistance of thermistor RT is calculated by formula RT=R1*t2/t1.Advantage is just two I/O ports that only need use Micro-processor MCV, and only produces power consumption when capacitor charging and electric discharge sampling, is in extremely low power dissipation state for a long time.In addition, the circuit structure of this temperature sampling device is simple, cost is low, and can be used for part does not have the Micro-processor MCV of AD port to carry out thermistor sampling.

Description

Temperature sampling device and telepilot

Technical field

The utility model belongs to field of household appliances, particularly relates to a kind of temperature sampling device and adopts the domestic electrical equipment remote controller of this temperature sampling device.

Background technology

Current most of household appliances all will sample temperature sensor (thermistor), mostly traditional method is to adopt structure as shown in Figure 1 to carry out: the dividing potential drop mode utilizing two resistance (thermistor RT and resistance R1), carries out AD conversion to complete temperature sampling by Micro-processor MCV.But complex structure, the cost of one side AD port are higher, are not that each MCU processor has enough AD ports; On the other hand, this circuit more can produce power consumption P=U*U/ (RT+R1) for a long time, and in this formula, U is supply voltage, and RT is the resistance of thermistor, and R1 is divider resistance resistance.So, when on the telepilot that this temperature sampling circuit is applied in household electrical appliances, then greatly can shorten the life-span of battery.

Utility model content

In view of this, first the purpose of this utility model is to provide a kind of temperature sampling device, is intended to solve AD port complexity in existing temperature sampling circuit, cost is high, and the technical matters that power consumption is higher.

To achieve these goals, the temperature sampling device that the utility model provides comprises: Micro-processor MCV and two I/O port, thermistor RT, reference resistance R1 and electric capacity C1;

The first end of described thermistor RT is connected with an I/O port of described Micro-processor MCV, the first end of described reference resistance R1 is connected with the 2nd I/O port of described Micro-processor MCV, second end of described thermistor RT and second end of described reference resistance R1 connect the first end of described electric capacity C1 simultaneously, the second end ground connection of described electric capacity C1.

Second aspect, the purpose of this utility model is also to provide a kind of telepilot, and it goes for the household electrical appliance such as televisor, air-conditioning, refrigerator and other small household appliances.Particularly, include a temperature sampling device, it is characterized in that in this telepilot, described temperature sampling device comprises Micro-processor MCV and two I/O port, thermistor RT, reference resistance R1 and electric capacity C1;

The first end of described thermistor RT is connected with an I/O port of described Micro-processor MCV, the first end of described reference resistance R1 is connected with the 2nd I/O port of described Micro-processor MCV, second end of described thermistor RT and second end of described reference resistance R1 connect the first end of described electric capacity C1 simultaneously, the second end ground connection of described electric capacity C1.

In sum, according to the temperature sampling device that the utility model provides, Micro-processor MCV is respectively output high level, low level or input state by arranging two I/O port, respectively charging and discharging is carried out to electric capacity C1, and record time t1 and the time t2 that electric capacity C1 passes through reference resistance R1 and thermistor RT electric discharge respectively, the resistance of thermistor RT is calculated by formula RT=R1*t2/t1.Advantage of the present utility model is mainly: two I/O ports that only need use Micro-processor MCV, and only produce power consumption when electric capacity C1 charges and electric discharge samples, in the most of the time of one-period, two I/O ports are all in non-sampled state, do not produce power consumption, therefore be in extremely low power dissipation state for a long time.In addition, the circuit structure of this temperature sampling device is simple, cost is low, and the portability of temperature sampling control method is also very strong, and can be used for part does not have the Micro-processor MCV of AD port to carry out thermistor sampling.

Accompanying drawing explanation

Fig. 1 is the structural drawing of existing temperature sampling device;

Fig. 2 is the structural drawing of the temperature sampling device that the utility model embodiment provides;

Fig. 3 is the realization flow figure of the temperature sampling control method that the utility model one embodiment provides;

Fig. 4 is the change schematic diagram of I/O port voltage and capacitance voltage in flow process shown in Fig. 3.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.

Fig. 2 is the structural drawing of the temperature sampling device that the utility model embodiment provides; For convenience of explanation, illustrate only part related to the present embodiment, as shown in the figure:

The temperature sampling device that the utility model embodiment provides, comprises Micro-processor MCV and two I/O port (an I/O port and the 2nd I/O port), thermistor RT, reference resistance R1 and electric capacity C1;

Electric capacity C1 connects with two I/O ports respectively by thermistor RT, reference resistance R1, particularly, the first end of thermistor RT is connected with an I/O port of Micro-processor MCV, the first end of reference resistance R1 is connected with the 2nd I/O port of Micro-processor MCV, second end of thermistor RT and second end of reference resistance R1 connect the first end of electric capacity C1 simultaneously, the second end ground connection of electric capacity C1.

In the course of work of said temperature sampler, first by the I/O port of Micro-processor MCV, electric capacity C1 is charged.When specific implementation, Micro-processor MCV can arrange two I/O port and all export high level and come for electric capacity C1 charges, and also can arrange that one of them I/O port exports high level, another I/O port is that input state (i.e. high-impedance state) comes to charge to electric capacity C1.After electric capacity C1 is full of electricity, one I/O port is set to high resistant input state, the 2nd I/O port output low level, by reference resistance R1, electric capacity C1 is discharged, now the voltage Vd of electric capacity C1 first end equals the voltage of Micro-processor MCV the one I/O port, records Vd terminal voltage from high level to low level time t1 by an I/O port.Then, export high level by an I/O port and/or the 2nd I/O port again and electricity is full of to electric capacity C1, and the 2nd I/O port B is set to high resistant input state, then an I/O port output low level is discharged to electric capacity C1 by thermistor RT, records corresponding Vd terminal voltage from high level to low level time t2 by the 2nd I/O port simultaneously.Calculated the resistance of thermistor RT again by formula RT=R1*t2/t1, and obtain the temperature parameter value corresponded.

In specific implementation process, the computing formula of the resistance capacitance charge/discharge time of said temperature sampler is: t=R*C*In [(V1-V0)/(V1-Vt)];

Wherein, V0 is the initial voltage value on electric capacity C1; V1 be electric capacity C1 finally chargeable to or the magnitude of voltage that discharges into; Vt is the magnitude of voltage on t electric capacity C1; C is the capacity of electric capacity C1; R is the resistance value in charge/discharge circuit.

If electric capacity C1 is discharged by reference resistance R1, t1 discharge time of an I/O port record of Micro-processor MCV is: t1=R1*C1*In [(V1-V0)/(V1-Vt)]----------Shi (2)

If electric capacity C1 is discharged by thermistor RT, t2 discharge time of the 2nd I/O port record of Micro-processor MCV is: t2=RT*C1*In [(V1-V0)/(V1-Vt)]----------Shi (3)

Above-mentioned formula (2) and formula (3) are divided by and can be obtained, t1/t2=R1/RT---------formula (4)

Namely for Micro-processor MCV, the ratio of the discharge time of two port records approximates the ratio of the resistance of two resistance, again because R1 is reference resistance, then often once just can be calculated resistance and the corresponding temperature point of thermistor RT by thermistor RT electric discharge.Further, for reference resistance R1, preferably, it is good for selecting resistance to be the resistance of 1 ~ 800k Ω.

Further, the utility model embodiment also provides a kind of telepilot.This telepilot its go for the various household electrical appliance such as small household appliances, televisor, air-conditioning, refrigerator.As improvement, include an above-mentioned temperature sampling device in this telepilot, particularly, this temperature sampling device comprises Micro-processor MCV and two I/O port, thermistor RT, reference resistance R1 and electric capacity C1; The first end of thermistor RT is connected with an I/O port of Micro-processor MCV, the first end of reference resistance R1 is connected with the 2nd I/O port of Micro-processor MCV, second end of thermistor RT and second end of reference resistance R1 connect the first end of electric capacity C1 simultaneously, the second end ground connection of electric capacity C1.

Further, as preferably, it is good that reference resistance R1 selects resistance to be the fixed resistance of 1 ~ 800k Ω.

The above-mentioned telepilot provided according to the utility model embodiment and temperature sampling device thereof, two I/O ports of Micro-processor MCV only need be used when carrying out temperature sampling, and only just produce power consumption when electric capacity C1 discharge and recharge samples, in one-period, be in extremely low power dissipation state for a long time.In addition, the circuit structure of this temperature sampling device is simple, cost is low, and can be used for part does not have the Micro-processor MCV of AD port to carry out thermistor sampling.

On the other hand, the utility model embodiment still provides a kind of temperature sampling control method realized based on said temperature sampler.Described from the course of work of said temperature sampler, this temperature sampling control method mainly comprises the following steps:

Charge step: Micro-processor MCV exports high level by its I/O port and/or the 2nd I/O port and charges to electric capacity C1;

Reference resistance R1 sampling step: Micro-processor MCV obtains described electric capacity C1 and discharges into time t1 when capacitance voltage drops to Vt by reference resistance R1;

Thermistor RT sampling step: Micro-processor MCV obtains described electric capacity C1 and discharges into time t2 when capacitance voltage drops to Vt by thermistor RT;

Temperature obtaining step: the resistance calculating described thermistor RT according to formula RT=R1*t2/t1, and obtain temperature parameter value corresponding thereto; Wherein, RT is the resistance of described thermistor RT, and R1 is the resistance of described reference resistance R1;

Low power consumption control step: Micro-processor MCV controls electric capacity C1 is discharged completely, and keeps the state of two I/O port to continue a period of time of presetting.

Fig. 3 shows the realization flow of the temperature sampling control method that the utility model one embodiment provides, and Fig. 4 shows the change schematic diagram of I/O port voltage and capacitance voltage in this flow process.See Fig. 3 and Fig. 4:

In step slo, Micro-processor MCV is charged to electric capacity C1 by its I/O port and/or the 2nd I/O port output high level.

This is charge step.When specific implementation, Micro-processor MCV can arrange two I/O port and all export high level and come for electric capacity C1 charges, and also can arrange that one of them I/O port exports high level, another I/O port is that input state (i.e. high-impedance state) comes to charge to electric capacity C1.Namely Fig. 4 shows Micro-processor MCV and arranges the situation that two I/O port all exports high level.In fact, even if dual-port carries out the mode of charging, can also arrange more neatly, be not necessarily set to high level simultaneously when specific implementation, be also likely that separately order time delay is arranged, as long as can realize charging to electric capacity C1.Further, in order to ensure that electric capacity C1 can charge completely, the resistance of preferred reference resistance R1 is between 1 ~ 800k Ω, and the time t that I/O port exports high level meets t >=5*R1*C.Suppose the reference resistance R1=10k Ω selected, electric capacity C1=1UF, then to export by its I/O port and/or the 2nd I/O port the time t that high level charge to electric capacity C1 just preferred at more than 5ms for Micro-processor MCV.

In step S20, Micro-processor MCV obtains electric capacity C1 and discharges into time t1 when capacitance voltage drops to Vt by reference resistance R1.

This is reference resistance R1 sampling step.Particularly, Micro-processor MCV arranges its I/O port is input state, the 2nd I/O port output low level; Micro-processor MCV according to the stop timing that electric capacity C1 is undertaken when the initial time that discharges and capacitance voltage drop to Vt by reference resistance R1, calculates t1 discharge time again.

When specific implementation, it is high resistant input state that Micro-processor MCV arranges an I/O port, the voltage Vd of electric capacity C1 first end just equals the voltage of an I/O port, then Micro-processor MCV arranges the 2nd I/O port output low level, electric capacity C1 is discharged by reference resistance R1, Micro-processor MCV starts to record the t1=0 time simultaneously, as shown in Figure 4 when electric capacity C1 voltage drops to Vt, one I/O port of Micro-processor MCV reads now Vd terminal voltage and becomes low level from high level, record electric discharge T.T. t1, thus complete sampling t1 the discharge time of reference resistance R1.In fact, low level voltage Vt presets according to the practical service environment of temperature sampling device, as long as the ceiling voltage V0 that the I/O port being less than MCU exports (voltage when namely electric capacity C1 is full of electricity) and be more than or equal to the minimum voltage V1 of the I/O port output of MCU.The minimum voltage V1 that Vt shown in Fig. 4 just exports than the I/O port of MCU is large, so after Micro-processor MCV obtains t1, electric capacity C1 also can continue electric discharge, until Vd terminal voltage is equal with the minimum voltage V1 that the I/O port of MCU exports.

In step s 30, Micro-processor MCV is charged to electric capacity C1 by its I/O port and/or the 2nd I/O port output high level.

This is second time charge step.Before this step, electric capacity C1 is through reference resistance R1 discharge off, and Micro-processor MCV will be charged to electric capacity C1 again by its I/O port, until Vd terminal voltage is equal with the high level voltage that its I/O port exports.Its implementation procedure is similar with step S10, just repeats no more at this.

In step s 40, Micro-processor MCV obtains electric capacity C1 and discharges into time t2 when capacitance voltage drops to Vt by thermistor RT.

This is thermistor RT sampling step.Particularly, Micro-processor MCV arranges its 2nd I/O port is input state, an I/O port output low level; Micro-processor MCV according to the stop timing that electric capacity C1 is undertaken when the initial time that discharges and capacitance voltage drop to Vt by thermistor RT, calculates t2 discharge time again.

When specific implementation, it is high resistant input state that Micro-processor MCV arranges the 2nd I/O port, same, the voltage Vd of electric capacity C1 first end equals the voltage of the 2nd I/O port, then Micro-processor MCV arranges an I/O port output low level, electric capacity C1 is discharged by thermistor RT, Micro-processor MCV starts to record the t2=0 time simultaneously, as shown in Figure 4 when the voltage of electric capacity C1 drops to Vt again, 2nd I/O port of Micro-processor MCV reads now Vd terminal voltage and becomes low level from high level, record electric discharge T.T. t2, thus complete sampling t2 the discharge time of thermistor RT.Here, low level voltage Vt equals the low level voltage Vt in abovementioned steps S20.Same, because the minimum voltage V1 that illustrated Vt exports than Micro-processor MCV I/O port is large, so after Micro-processor MCV obtains t1, electric capacity C1 also can continue electric discharge, until Vd terminal voltage is equal with the minimum voltage V1 that the I/O port of MCU exports.

In step s 50, calculate the resistance of thermistor RT according to formula RT=R1*t2/t1, and obtain temperature parameter value corresponding thereto.

This is temperature obtaining step.In this step, Micro-processor MCV, according to formula RT=R1*t2/t1, just can calculate the resistance of thermistor RT.For example, get reference resistance R1=10k Ω, electric capacity C1=0.1uF, the time t1=1.02ms discharged by reference resistance R1 is got in above-mentioned steps S20, the time t2=2.04ms discharged by thermistor RT is got in above-mentioned steps S40, again according to above-mentioned formula, Micro-processor MCV calculates RT=R1*t2/t1=20k Ω, and namely thermistor RT resistance is now 20k Ω.After the resistance obtaining thermistor RT, further again by table look-up or other modes obtain the temperature parameter value corresponded.

In step S60, Micro-processor MCV controls electric capacity C1 is discharged completely, and keeps the state of two I/O port to continue a period of time of presetting.

This is low power consumption control step.After the voltage of electric capacity C1 drops to low level Vt, Micro-processor MCV or the equal output low level of two I/O port is set, its the 2nd I/O port is kept to be input state, an I/O port continuation output low level, making electric capacity C1 be discharged to Vd terminal voltage completely drops to equal with the low level of I/O port, and keeps the state of two I/O port to continue a period of time of presetting.In this case, two I/O ports of Micro-processor MCV and electric capacity C1 are in low level, thus do not form current return, thus realize not power consumption between resistance RT, R1 and electric capacity C1.

According to the temperature sampling control method that the utility model embodiment provides, only carry out in the process of discharging in the charging process of electric capacity C1 and electric capacity C1 respectively by reference resistance R1 and thermistor RT, just meeting generation current, generation power consumption, and mostly generally be 0.01 ~ 30ms (specifically deciding according to the resistance of RT, R1 and the size of C1 electric capacity) T.T. of electric capacity C1 charge and discharge process.And the duration of low power consumption control step is preferably between 0.5 ~ 2.0 second, namely just carried out a temperature sampling every 0.5 ~ 2 second.As mentioned above, the ratio that the power consumption time accounts for one-period overall time is 0.01 ~ 30ms/0.5 ~ 2s, and namely the power consumption time accounts for the ratio of T.T. and is about 0.0005% ~ 6%.Thus ensure that large absolutely portion is in low power consumpting state the time, thus reach low-power consumption, energy-conservation object.

Fig. 3 is a complete set of realization flow of the temperature sampling control method that the utility model embodiment provides, in fact, in specific implementation process, consider that reference resistance R1 is fixing resistance value, under power supply and electric capacity C1 do not have situation of change, the time t1 value that electric capacity C1 is discharged into when voltage is Vt by reference resistance R1 should be a constant, thus generally need not repeat to sample t1 to reference resistance R1.

Therefore, the temperature sampling control method that the utility model embodiment provides, both can periodically perform above-mentioned steps S10 ~ S60, and the number of times namely performing reference resistance R1 sampling step is identical with the number of times performing thermistor RT sampling step; Also can and if only if when powering on, perform a reference resistance R1 sampling step S20, namely a step S10 ~ S60 is performed when powering on, follow-up execution step S30 ~ S60 no longer performs step S10 ~ S20 to sample to thermistor RT to sample to reference resistance R1, reduces capacitor charge and discharge number of times, reduces power consumption.Further, reduce mode that capacitor charge and discharge number of times reduces power consumption also to comprise fixed time intervals and perform a reference resistance R1 sampling step, namely a step S10 ~ S60 is performed when powering on, the follow-up major part sample period only performs step S30 ~ S60 and samples to thermistor RT, and fixed time intervals performs a step S10 ~ S20 once in a while to sample to reference resistance R1.

On the other hand, can perform N capacitor charging and reference resistance R1 sampling step continuously, draw the mean value of a time t1, the follow-up step S30 ~ S60 that performs respectively is again to carry out multiple repairing weld to thermistor RT.Even, continuous N time can also be obtained a mean value to the thermistor RT multiple time t2 obtained that carry out sampling, then calculate the value of thermistor RT.Here, N, M natural number all for being more than or equal to 1.

It should be noted that, the executive mode of reference resistance R1, thermistor RT sampling step is varied, as long as carry out the sampling mode of acquisition discharge time again by first electric capacity being full of electricity, all within the scope of the utility model embodiment restriction.Above-mentioned several mode, is only and exemplifies, and be not used in restriction.

In sum, the temperature sampling device provided according to the utility model and the temperature sampling control method realized based on it, Micro-processor MCV is respectively output high level, low level or input state by arranging two I/O port, respectively charging and discharging is carried out to electric capacity C1, and record time t1 and the time t2 that electric capacity C1 passes through reference resistance R1 and thermistor RT electric discharge respectively, the resistance of thermistor RT is calculated by formula RT=R1*t2/t1.Advantage of the present utility model is mainly: two I/O ports that only need use Micro-processor MCV, and only produce power consumption when electric capacity C1 charges and electric discharge samples, in the most of the time of one-period, two I/O ports are all in non-sampled state, do not produce power consumption, therefore be in extremely low power dissipation state for a long time.In addition, the circuit structure of this temperature sampling device is simple, cost is low, and the portability of temperature sampling control method is also very strong, and can be used for part does not have the Micro-processor MCV of AD port to carry out thermistor sampling.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, although carried out comparatively detailed description with reference to previous embodiment to the utility model, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments or carry out equivalent replacement to wherein portion of techniques feature.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.

Claims (4)

1. a temperature sampling device, is characterized in that, described temperature sampling device comprises Micro-processor MCV and two I/O port, thermistor RT, reference resistance R1 and electric capacity C1;

The first end of described thermistor RT is connected with an I/O port of described Micro-processor MCV, the first end of described reference resistance R1 is connected with the 2nd I/O port of described Micro-processor MCV, second end of described thermistor RT and second end of described reference resistance R1 connect the first end of described electric capacity C1 simultaneously, the second end ground connection of described electric capacity C1.

2. temperature sampling device as claimed in claim 1, it is characterized in that, the resistance of described reference resistance R1 is 1 ~ 800 kilo-ohm.

3. a telepilot, comprises a temperature sampling device, it is characterized in that, described temperature sampling device comprises Micro-processor MCV and two I/O port, thermistor RT, reference resistance R1 and electric capacity C1;

The first end of described thermistor RT is connected with an I/O port of described Micro-processor MCV, the first end of described reference resistance R1 is connected with the 2nd I/O port of described Micro-processor MCV, second end of described thermistor RT and second end of described reference resistance R1 connect the first end of described electric capacity C1 simultaneously, the second end ground connection of described electric capacity C1.

4. telepilot as claimed in claim 3, it is characterized in that, the resistance of described reference resistance R1 is 1 ~ 800 kilo-ohm.