CN107145173B - Temperature sampling circuit, temperature sampling control method and household electrical appliance - Google Patents
Temperature sampling circuit, temperature sampling control method and household electrical appliance Download PDFInfo
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- CN107145173B CN107145173B CN201610892505.2A CN201610892505A CN107145173B CN 107145173 B CN107145173 B CN 107145173B CN 201610892505 A CN201610892505 A CN 201610892505A CN 107145173 B CN107145173 B CN 107145173B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Abstract
The present invention relates to field of circuit technology, disclose a kind of temperature sampling circuit, temperature sampling control method and household electrical appliance, including temperature measurement circuit, to incude the temperature of sampled point, and be converted to voltage, the temperature measurement circuit includes temperature sensing device I and temperature sensing device II, respectively to incude the temperature value of different temperatures range；ON-OFF control circuit, to control being switched on or switched off for temperature sensing device I and temperature sensing device II；Governor circuit, to acquire the voltage of temperature measurement circuit and being switched on or switched off for control switch control circuit, according to the corresponding temperature sensing device temperature sensor of different temperatures range, temperature collection data, the sampling for realizing wide temperature range high sensitivity, improves the responsiveness and temperature measurement accuracy of circuit.
Description
Technical field
The present invention relates to field of circuit technology, and in particular, to a kind of temperature sampling circuit, temperature sampling control method and
Household electrical appliance.
Background technique
Many household electrical appliance, such as culinary art, electric heating appliance product the course of work that be with temperature be is inseparable, for
Cook class household electrical appliance, such as electromagnetic oven, because different food has different cooking temps, to heating class household electrical appliance, such as electricity
Hot heater, different users have different temperature requirements, and different user's operations has different temperature regulation processes.With life
The flat raising of running water, user increase the operational requirements of household appliances, it is desirable that also correspondingly increase, for cooking, warming oneself
More stringent requirements are proposed for the temperature sensitivity and precision of household appliances.
Current heating electric appliances product is mostly that built-in resistive temperature sensing device goes sensing temperature, but this resistive
Temperature sensing device has itself inevitable defect.For example, the resistive temperature detector of negative sense of sensing cookware temperature common for electromagnetic oven
Part, temperature be more than a certain range after resistance value change rate with regard to smaller, thus when temperature is higher temperature-sensitive sensitivity with regard to big
Big to reduce, sensing temperature differs greatly with actual temperature.
Summary of the invention
The object of the present invention is to provide a kind of temperature sampling circuit, temperature sampling control method and household electrical appliance, the temperature
Sample circuit corresponds to different temperature sensing devices within the scope of different temperature ranges, and the sensitivity in wide temperature range is higher,
Improve response speed and temperature measurement accuracy.
To achieve the goals above, the present invention provides a kind of temperature sampling circuit, including temperature measurement circuit, to incude sampling
The temperature of point, and voltage is converted to, which includes temperature sensing device I and temperature sensing device II, respectively to incude not equality of temperature
Spend the temperature value of range；ON-OFF control circuit, to control being switched on or switched off for temperature sensing device I and temperature sensing device II；Master control electricity
Road, to acquire the voltage of temperature measurement circuit and being switched on or switched off for control switch control circuit.
Preferably, the temperature sensing device I is using the thermistor T1 of negative temperature coefficient, and the temperature sensing device II is using positive temperature
Spend the thermistor T2 of coefficient；It is being less than within the scope of set temperature T0, the resistance value exponentially type of the T1 decays；It is being greater than setting
Within the scope of temperature T0, the resistance value exponentially type of the T2 increases；Wherein, the range of T0 is 70-120 DEG C.
Preferably, the temperature measurement circuit further includes resistance R2, resistance R4, switch S1 and switch S2；The thermistor T2
Power supply VCC, other end ground connection are accessed through the resistance R2 in one end；Power supply is accessed through the switch S1 in the one end the thermistor T1
VCC, the other end are grounded through the switch S2 and resistance R4；Between the thermistor T1 and the switch S2 with the electricity
It is connected between the resistance R2 and thermistor T1, accesses the sampling end TMIAN-IN of governor circuit.
Preferably, the temperature measurement circuit further includes resistance R3, and the thermistor T2 is through the resistance R3 and the resistance
R4 ground connection.
Preferably, the temperature measurement circuit further include: resistance R1, the temperature measurement circuit access governor circuit by resistance R1
Sampling end TMIAN-IN；The sampling end TMIAN-IN of capacitor C1, the governor circuit are grounded by capacitor C1.
Preferably, the ON-OFF control circuit includes triode Q1, triode Q2, coil K1 and coil K2；Three pole
The base stage of pipe Q1 and the triode Q2 are connect with the control terminal CTRL of the governor circuit；The collector of the triode Q1 is logical
The collector for crossing coil K1 access the power vd D, the triode Q2 accesses power vd D by the coil K2；Described three
The emitter of pole pipe Q1 and the triode Q2 ground connection；The coil K1 and the switch S1 coupling, the coil K1 obtain it is electric or
Power loss drives switch S1 to be attracted or open；The coil K2 and switch S2 coupling, the coil K2 obtain electric or power loss and drive
Switch S2 is attracted or opens.
Preferably, the ON-OFF control circuit further includes R5, and the base stage of the triode Q1 and the triode Q2 pass through
R5 connects the control terminal CTRL of the governor circuit.
Preferably, the ON-OFF control circuit further includes diode D1, diode D2, capacitor C2 and capacitor C3；Described two
Pole pipe D1 cathode meets power vd D, and anode connects the collector of the triode Q1；The diode D2 cathode meets power vd D, anode
Connect the collector of the triode Q2；The one end the capacitor C2 connects the base stage of the triode Q1, other end ground connection；The electricity
Hold the base stage that the one end C3 connects the triode Q2, other end ground connection.
The present invention also provides a kind of temperature sampling control methods, comprising: acquires the temperature value of sampled point；It will be described in acquisition
Temperature value is compared with set temperature value；When the temperature value is greater than the set temperature value, the temperature-sensitive of positive temperature coefficient is used
Device incudes the temperature of the sampled point；When the temperature value is less than the set temperature value, the sense of negative temperature coefficient is used
Warm device incudes the temperature of the sampled point.
The present invention also provides a kind of household electrical appliance, which includes temperature sampling circuit as described above.
Through the above technical solutions, governor circuit control switch control circuit is switched on or switched off, with the choosing of control switch circuit
Different temperature sensing device in logical temperature measurement circuit, temperature measurement circuit includes temperature sensing device I and temperature sensing device II, respectively to incude difference
The temperature value of temperature range；Realize the induction of total temperature range.Negative temperature coefficient is respectively adopted in temperature sensing device I and temperature sensing device II
Thermistor T1 and the thermistor T2 of positive temperature coefficient use different temperature sensing device senses within the scope of different temperature
Answer temperature.The characteristic that the resistance value of positive and negative temperature coefficient thermistor T1 and T2 varies with temperature is combined, is made in wide temperature model
Enclose interior sampling sensitivity with higher.
The acquisition of temperature is realized by way of acquisition partial pressure, when switch S1 and switch S2 is disconnected, thermistor T1 institute
Branch disconnect, branch where thermistor T2 is connected, between thermistor T2 and resistance R2 series connection access VCC and ground,
The resistance value of thermistor T2 varies with temperature, and then becomes from the partial pressure of the sampling end TMIAN-IN thermistor T2 measured with resistance value
Change, obtains the corresponding relationship of thermistor T2 partial pressure and temperature change.When switch S1 is connected with switch S2, switch S2 is shorted heat
Quick resistance T2, switch S1 connect the branch where thermistor T1, at this point, resistance R2 and thermistor T1 are in parallel, connect in power supply
Between VCC and resistance R4, thermistor T1 resistance value is varied with temperature, thermistor T1 and resistance R2 it is in parallel after intrinsic standoff ratio also with
Variation, obtain temperature value by the way that the partial pressure into governor circuit-resistance value-temperature corresponding relationship is stored in advance.Circuit structure letter
Single, sampling configuration switching is flexible.
And switch S1, S2 pass through the on and off control of triode Q1, Q2 in ON-OFF control circuit, ON-OFF control circuit
Structure is simple, at low cost.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the temperature sampling circuit control program figure of one embodiment of the present invention；
Fig. 2 is that the negative tempperature coefficient thermistor T1 resistance value of one embodiment of the present invention varies with temperature curve；
Fig. 3 is that the posive temperature coefficient thermistor T2 resistance value of one embodiment of the present invention varies with temperature curve；
Fig. 4 is positive and negative temperature coefficient thermistor T1, T2 of combination of the temperature sampling circuit of one embodiment of the present invention
Resistance value vary with temperature curve；
Fig. 5 is the temperature sampling circuit connection figure of one embodiment of the present invention；
Fig. 6 is the temperature sampling circuit connection figure of another embodiment of the present invention；
Fig. 7 is the temperature sampling circuit low-temperature measurement equivalent circuit diagram of one embodiment of the present invention；
Fig. 8 is the temperature sampling circuit high temperature measurement equivalent circuit diagram of one embodiment of the present invention；
Fig. 9 is the temperature sampling control method flow chart of one embodiment of the present invention.
Description of symbols
11 governor circuit, 21 ON-OFF control circuit, 31 temperature measurement circuit
41 sampled points
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Fig. 1 is the temperature sampling circuit control program figure of one embodiment of the present invention.As shown in Figure 1, the present invention is a kind of
The temperature sampling circuit of embodiment, including temperature measurement circuit 31 to incude the temperature of sampled point 41, and are converted to voltage, should
Temperature measurement circuit 31 includes temperature sensing device I and temperature sensing device II, respectively to incude the temperature value of different temperatures range；Switch control
Circuit 21, to control being switched on or switched off for temperature sensing device I and temperature sensing device II；Governor circuit 11, to acquire temperature measurement circuit
31 voltage and control switch control circuit 21 are switched on or switched off.
In above scheme, it is switched on or switched off by 11 control switch control circuit 21 of governor circuit, with control switch circuit
Temperature sensing device different in temperature measurement circuit 31 is gated, temperature measurement circuit 31 includes temperature sensing device I and temperature sensing device II, respectively to feel
Answer the temperature value of different temperatures range；Realize the induction of total temperature range.
According to an embodiment of the present invention, thermistor T1 of the temperature sensing device I using negative temperature coefficient, the sense
Warm device II uses the thermistor T2 of positive temperature coefficient；It is being less than within the scope of set temperature T0, the resistance value exponentially of the T1
Type decaying；It is being greater than within the scope of set temperature T0, the resistance value exponentially type of the T2 increases；Wherein, the range of T0 is 70-120
℃。
Fig. 2 is that the negative tempperature coefficient thermistor T1 resistance value of one embodiment of the present invention varies with temperature curve.Such as Fig. 2
It is shown, it is less than within the scope of set temperature T0 in sampled point temperature, the resistance value of the negative tempperature coefficient thermistor T1 is in temperature
Exponential decay, and change rate is larger, and biggish resistance value difference is obtained in the temperature range of very little, change in resistance is bright
It is aobvious.Within the temperature range of being less than T0, which is the with higher sensitivity temperature range varied with temperature, and R0-Rn is
With higher sensitivity Standard resistance range.
Fig. 3 is that the posive temperature coefficient thermistor T2 resistance value of one embodiment of the present invention varies with temperature curve.Such as Fig. 3
Shown, when temperature is greater than T0, with temperature, exponentially type increases the resistance value of posive temperature coefficient thermistor T2, and change rate is larger,
Biggish resistance value difference is obtained in the temperature range of very little, most value variation is obvious.Within the temperature range of being greater than T0,
The temperature sensing device II is the with higher sensitivity temperature range varied with temperature, and R0-Rn is with higher sensitivity Standard resistance range.
Fig. 4 is that the temperature sampling circuit of one embodiment of the present invention combines positive and negative temperature coefficient thermistor T1
Curve is varied with temperature with the resistance value of T2.As shown in figure 4, the temperature measurement circuit of one embodiment of the present invention combines two kinds of differences
The temperature sensing device of temperature characterisitic is used using negative tempperature coefficient thermistor T1 in the change in resistance of T1'-T0 temperature range
Change in resistance of the posive temperature coefficient thermistor T2 in T0-Tn temperature range.Selecting T0 is threshold of senstitivity, in the same of acquisition data
When be compared in real time with T0.When temperature is lower than T0, negative tempperature coefficient thermistor T1 is gated, using negative temperature coefficient heat-sensitive
The characteristic that the resistance value of resistance T1 varies with temperature；When temperature is higher than T0, posive temperature coefficient thermistor T2 is gated, using positive temperature
The characteristic that the resistance value of degree coefficient resistance T2 varies with temperature.R0-Rn is with higher sensitivity Standard resistance range.T1'-Tn is electricity
The operating temperature range of device.Entire temperature characteristics ensure that it is all with higher sensitivity shape within the temperature range of T1'-Tn
State.
In above scheme, it is that the change of sensitivity of existing thermistor is brighter that the range of T0, which for example can be 80-100 DEG C,
Aobvious section.As one embodiment of the present invention, settable T0 is 90 DEG C, is selected in less than 90 DEG C range internal resistance value exponentiallies
The thermistor T1 of type decaying, and in the thermistor T2 for being greater than the growth of 90 DEG C of range internal resistance value exponentially types.
Fig. 5 is the temperature sampling circuit connection figure of one embodiment of the present invention.As shown in figure 5, a kind of implementation of the present invention
In the temperature sampling circuit of mode, the temperature measurement circuit 31 further includes resistance R2, resistance R4, switch S1 and switch S2；The heat
Power supply VCC, other end ground connection are accessed through the resistance R2 in the one end quick resistance T2；The one end the thermistor T1 is through the switch S1
Power supply VCC is accessed, the other end is grounded through the switch S2 and resistance R4；Between the thermistor T1 and the switch S2
It is connected between the resistance R2 and the thermistor T1, accesses the sampling end TMIAN-IN of governor circuit.
In above scheme, when switch S1 and switch S2 is disconnected, the branch where thermistor T1 is disconnected, thermistor T2
The branch at place is connected, and between thermistor T2 and resistance R2 series connection access VCC and ground, the resistance value of thermistor T2 becomes with temperature
Change, and then from the partial pressure of the sampling end TMIAN-IN thermistor T2 measured with change in resistance, obtain thermistor T2 partial pressure with
The corresponding relationship of temperature change.Temperature is obtained by the way that the partial pressure into governor circuit-resistance value-temperature corresponding relationship is stored in advance
Value.
When switch S1 is connected with switch S2, switch S2 is shorted thermistor T2, and switch S1 is connected where thermistor T1
Branch connect between power supply VCC and resistance R4, thermistor T1 resistance value is with temperature at this point, resistance R2 and thermistor T1 is in parallel
Intrinsic standoff ratio after degree variation, thermistor T1 and resistance R2 parallel connection also changes therewith, by the way that point into governor circuit is stored in advance
Pressure-resistance value-temperature corresponding relationship obtains temperature value.
According to an embodiment of the present invention, the ON-OFF control circuit include triode Q1, triode Q2, coil K1 and
Coil K2；The base stage of the triode Q1 and the triode Q2 are connect with the control terminal CTRL of the governor circuit；Described three
The collector of pole pipe Q1 accesses power vd D by the coil K1, and the collector of the triode Q2 is connect by the coil K2
Enter power vd D；The emitter of the triode Q1 and the triode Q2 ground connection；The coil K1 and switch S1 coupling,
The coil K1 obtains electric or power loss and switch S1 is driven to be attracted or open；The coil K2 and switch S2 coupling, the coil
K2 obtains electric or power loss and switch S2 is driven to be attracted or open.
In above scheme, control terminal CTRL is connected with governor circuit.When temperature is lower than T0, control terminal CTRL input is high
Level, by controlling base stage the turn-on transistor Q1 and Q2 of triode Q1 and triode Q2, thus control coil K1 and coil K2
Power on VDD, the coil K1 and K2 of conducting drive switch S1 and S2 to be attracted, gate the branch where thermistor T1, simultaneously
Branch where short-circuit thermistor T2 is realized and is divided by the thermistor T1 temperature sensor of negative temperature coefficient, acquisition；Temperature is high
When T0, control terminal CTRL input voltage is higher than VDD or is 0, and triode Q1 and Q2 are turned off, and coil K1 and K2 be not from power supply
VDD is disconnected, and switch S1 and switch S2 are opened, and disconnects branch where thermistor T1, the branch being also turned on where thermistor T2
Road is realized and is divided by the thermistor T2 temperature sensor of positive temperature coefficient, acquisition.TMIAN-IN inputs the partial pressure data of acquisition
Into main control module, and temperature data is converted by voltage data by main control module and is used to control corresponding operating process.
Fig. 6 is the temperature sampling circuit connection figure of another embodiment of the present invention.As shown in fig. 6, a kind of reality of the present invention
Apply in the temperature sampling circuit of mode, the temperature measurement circuit further includes resistance R3, the thermistor T2 through the resistance R3 and
The resistance R4 ground connection.
According to an embodiment of the present invention, the temperature measurement circuit further include: resistance R1, the temperature measurement circuit pass through resistance
The sampling end TMIAN-IN of R1 access governor circuit；The sampling end TMIAN-IN of capacitor C1, the governor circuit pass through capacitor C1
Ground connection.
Fig. 7 is the temperature sampling circuit low-temperature measurement equivalent circuit diagram of one embodiment of the present invention.As shown in fig. 7, this
A kind of temperature sampling circuit low temperature of embodiment is invented, that is, the measurement equivalent circuit being less than in T0 temperature range, R1 is current limliting
Resistance, the size of current of control input governor circuit；Resistance R2 and T1 parallel connection and R4 are divided, the thermistor T1 of negative temperature coefficient
Resistance value becomes smaller after in parallel with R2, and the partial pressure effect of R4 can be made to become apparent from, and provides voltage-resistance value with the responsiveness of temperature；Capacitor C1
It is filter capacitor, filters out burr signal；At this point, governor circuit be acquire R4 resistance voltage division signal it is defeated by sampling end TMAIN-IN
Enter to governor circuit.When temperature is less than T0, negative tempperature coefficient thermistor T1, as temperature increases, thermistor T1 are gated
Resistance value be gradually reduced, the partial pressure of R4 is then gradually increased.
Fig. 8 is the temperature sampling circuit high temperature measurement equivalent circuit diagram of one embodiment of the present invention.As shown in figure 8, this
A kind of temperature sampling circuit high temperature of embodiment is invented, that is, the measurement equivalent circuit being greater than in T0 temperature range, R1 is current limliting
Resistance, the size of current of control input governor circuit；R2 is divider resistance, the system constituted with tri- devices of T2, R3 and R4 point
Pressure；T2 is the thermistor of positive temperature coefficient, and R3, R4 connect with T2, and resistance value increases, when gating T2, it is possible to increase partial pressure effect mentions
The responsiveness of high partial pressures and temperature change；C1 is filter capacitor, filters out burr signal；The partial pressure of T2, R3 and R4 are by governor circuit
Sampling end TMAIN-IN is acquired and is input to main control module；When temperature is higher than T0, posive temperature coefficient thermistor T2 is gated, with
Temperature increase, the resistance value of T2 is gradually increased, and the partial pressure of acquisition is gradually increased.
According to an embodiment of the present invention, the ON-OFF control circuit further includes R5, the triode Q1 and described three
The base stage of pole pipe Q2 connects the control terminal CTRL of the governor circuit by R5.
According to an embodiment of the present invention, the ON-OFF control circuit further includes diode D1, diode D2, capacitor C2
With capacitor C3；The diode D1 cathode meets power vd D, and anode connects the collector of the triode Q1；The diode D2 is negative
Pole meets power vd D, and anode connects the collector of the triode Q2；The one end the capacitor C2 connects the base stage of the triode Q1,
Other end ground connection；The one end the capacitor C3 connects the base stage of the triode Q2, other end ground connection.
Fig. 9 is the temperature sampling control method flow chart of one embodiment of the present invention.As shown in figure 9, the present invention is a kind of
The temperature sampling control method of embodiment, comprising: in step s 110, acquire the temperature value of sampled point；In the step s 120,
By the temperature value of acquisition compared with set temperature value；When the temperature value is greater than the set temperature value, in step
In S130, the temperature of the sampled point is incuded using the temperature sensing device of positive temperature coefficient；When the temperature value is less than the setting
When temperature value, in step S140, the temperature of the sampled point is incuded using the temperature sensing device of negative temperature coefficient.
In above scheme, when temperature is less than set temperature, selection responds the sense of sensitive negative temperature coefficient in this section
Warm device, and when temperature is greater than set temperature, selection responds the temperature sensing device of sensitive positive temperature coefficient in this section.Consider
Different temperature sensing devices has different response characteristics in different temperature ranges, and it is sensitive to choose response in different temperature ranges
The temperature sensing device of the different sensitivity in different temperatures section is combined acquisition total temperature range to respond sensitive by temperature sensing device work
Characteristic curve, to obtain the temperature sampling control method of wide scope high sensitivity.
The present invention also provides a kind of household electrical appliance, which includes temperature sampling circuit as described above.Institute as above
The temperature sampling circuit stated can be applied to such as electromagnetic oven, insulating pot, electric heater culinary art, heat in household electrical appliance, or can be used for
In other household electrical appliance more demanding to temperature sensitivity.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.For example, bleeder circuit can be expanded for principle it is similar
Bleeder circuit, the quantity and circuit connection structure of divider resistance R2, R3 and R4 can be adjusted according to actual circuit, switch S1 and
S2 can be changed to the other kinds of switching device in addition to coil, relay, can be electric in understanding by the data application of acquisition
Device working condition or control electrical work mode；Temperature sensing device I and temperature sensing device II can be expanded as other kinds of temperature-sensitive
Device or temperature sensor.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of temperature sampling circuit characterized by comprising
Temperature measurement circuit to incude the temperature of sampled point, and is converted to voltage, which includes temperature sensing device I and temperature-sensitive
Device II, respectively to incude the temperature value of different temperatures range；
ON-OFF control circuit, to control being switched on or switched off for temperature sensing device I and temperature sensing device II；
Governor circuit, to acquire the voltage of temperature measurement circuit and being switched on or switched off for control switch control circuit；
Wherein, the temperature sensing device I is using the thermistor T1 of negative temperature coefficient, and the temperature sensing device II is using positive temperature coefficient
Thermistor T2；
It is being less than within the scope of set temperature T0, the resistance value exponentially type of the T1 decays；
It is being greater than within the scope of set temperature T0, the resistance value exponentially type of the T2 increases.
2. circuit according to claim 1, which is characterized in that the range of the set temperature T0 is 70-120 DEG C.
3. circuit according to claim 1, which is characterized in that the temperature measurement circuit further includes resistance R2, resistance R4, switch
S1 and switch S2；
Power supply VCC, other end ground connection are accessed through the resistance R2 in the one end the thermistor T2；
Power supply VCC is accessed through the switch S1 in the one end the thermistor T1, and the other end is through the switch S2 and the resistance R4
Ground connection；
It is connected between the resistance R2 and the thermistor T1 between the thermistor T1 and the switch S2, access master
Control the sampling end TMIAN-IN of circuit.
4. circuit according to claim 3, which is characterized in that the temperature measurement circuit further includes resistance R3, the temperature-sensitive electricity
T2 is hindered to be grounded through the resistance R3 and resistance R4.
5. circuit according to claim 3, which is characterized in that the temperature measurement circuit further include:
Resistance R1, the temperature measurement circuit access the sampling end TMIAN-IN of governor circuit by resistance R1；
The sampling end TMIAN-IN of capacitor C1, the governor circuit are grounded by capacitor C1.
6. circuit according to claim 3, which is characterized in that the ON-OFF control circuit include triode Q1, triode Q2,
Coil K1 and coil K2；
The base stage of the triode Q1 and the triode Q2 are connect with the control terminal CTRL of the governor circuit；
The collector of the triode Q1 accesses power vd D by the coil K1, and the collector of the triode Q2 passes through institute
State coil K2 access power vd D；
The emitter of the triode Q1 and the triode Q2 ground connection；
The coil K1 and switch S1 coupling, the coil K1 obtain electric or power loss and switch S1 are driven to be attracted or open；It is described
Coil K2 and switch S2 coupling, the coil K2 obtain electric or power loss and switch S2 are driven to be attracted or open.
7. circuit according to claim 6, which is characterized in that the ON-OFF control circuit further includes resistance R5, and described three
Pole pipe Q1 connects the control terminal CTRL of the governor circuit with the base stage of the triode Q2 by resistance R5.
8. circuit according to claim 6, which is characterized in that the ON-OFF control circuit further includes diode D1, two poles
Pipe D2, capacitor C2 and capacitor C3；
The diode D1 cathode meets power vd D, and anode connects the collector of the triode Q1；
The diode D2 cathode meets power vd D, and anode connects the collector of the triode Q2；
The one end the capacitor C2 connects the base stage of the triode Q1, other end ground connection；
The one end the capacitor C3 connects the base stage of the triode Q2, other end ground connection.
9. a kind of temperature sampling control method characterized by comprising
Acquire the temperature value of sampled point；
By the temperature value of acquisition compared with set temperature value；
When the temperature value is greater than the set temperature value, the sampled point is incuded using the temperature sensing device of positive temperature coefficient
Temperature；
When the temperature value is less than the set temperature value, the sampled point is incuded using the temperature sensing device of negative temperature coefficient
Temperature.
10. a kind of household electrical appliance, which is characterized in that the household electrical appliance include temperature according to claim 1 to 8
Spend sample circuit.
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| CN201610892505.2A CN107145173B (en) | 2016-10-12 | 2016-10-12 | Temperature sampling circuit, temperature sampling control method and household electrical appliance |
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| CN201610892505.2A CN107145173B (en) | 2016-10-12 | 2016-10-12 | Temperature sampling circuit, temperature sampling control method and household electrical appliance |
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| CN107145173B true CN107145173B (en) | 2019-05-03 |
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| CN107951389B (en) * | 2017-12-26 | 2020-10-27 | 九阳股份有限公司 | Food processing machine |
| CN110044508B (en) * | 2018-01-15 | 2021-02-26 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and temperature measuring method and device thereof |
| CN109580025B (en) * | 2019-01-23 | 2021-01-26 | 无锡华宸控制技术有限公司 | Wide-range platinum resistor temperature sampling circuit |
| CN110967642B (en) * | 2019-04-30 | 2021-05-18 | 宁德时代新能源科技股份有限公司 | Thermal runaway detection circuit and method |
| CN110095155B (en) * | 2019-05-21 | 2021-08-10 | 深圳洲斯移动物联网技术有限公司 | Control method, temperature and humidity detection device and temperature and humidity detection system |
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| CN104600827A (en) * | 2014-12-05 | 2015-05-06 | 超威电源有限公司 | Composite power supply and control method thereof and electric vehicle with same |
| CN205563313U (en) * | 2016-03-11 | 2016-09-07 | 廊坊开发区欧特克精密电子线束制造有限公司 | Thermistor automatic control temperature control circuit based on 555 timer |
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|---|---|---|---|---|
| CN2204983Y (en) * | 1994-09-03 | 1995-08-09 | 柳名珍 | Multifunctional portable electronic refrigerator with heating function |
| US6250802B1 (en) * | 1999-10-12 | 2001-06-26 | Homecare Technologies Ltd | Electronic thermometer with preheating |
| WO2006100192A1 (en) * | 2005-03-22 | 2006-09-28 | Schneider Electric Industries Sas | Device for switching a electric circuit with a sequential opening system |
| CN1888838A (en) * | 2006-07-19 | 2007-01-03 | 青岛科技大学 | Combined temperature sensor |
| CN104600827A (en) * | 2014-12-05 | 2015-05-06 | 超威电源有限公司 | Composite power supply and control method thereof and electric vehicle with same |
| CN205563313U (en) * | 2016-03-11 | 2016-09-07 | 廊坊开发区欧特克精密电子线束制造有限公司 | Thermistor automatic control temperature control circuit based on 555 timer |
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|---|---|
| CN107145173A (en) | 2017-09-08 |
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