CN206847815U - It is segmented temperature measuring equipment and cooking appliance - Google Patents
It is segmented temperature measuring equipment and cooking appliance Download PDFInfo
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- CN206847815U CN206847815U CN201720762562.9U CN201720762562U CN206847815U CN 206847815 U CN206847815 U CN 206847815U CN 201720762562 U CN201720762562 U CN 201720762562U CN 206847815 U CN206847815 U CN 206847815U
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Abstract
The utility model discloses one kind segmentation temperature measuring equipment and cooking appliance, wherein, the segmentation temperature measuring equipment, including：Temperature sampling circuit, temperature sampling circuit includes multiple thermistors, each corresponding temperature detection section of thermistor, temperature sampling circuit carries out temperature sampling to realize that device under test carries out segmentation thermometric by each thermistor, and exports corresponding temperature sampling signal；Switching circuit, switching circuit are connected with temperature sampling circuit, and switching circuit is used for the thermistor for being switched into trip temperature detection work；Control unit, control unit are connected with the output end of temperature sampling circuit and the control terminal of switching circuit respectively, and control unit is controlled according to temperature sampling signal acquisition Current Temperatures sampled value according to Current Temperatures sampled value to switching circuit.According to segmentation temperature measuring equipment of the present utility model, the temperature range of sampling can be widened by switching thermistor, so as to improve the accuracy of temperature sampling value.
Description
Technical field
Household electrical appliance technical field is the utility model is related to, more particularly to a kind of segmentation temperature measuring equipment and a kind of culinary art electricity
Device.
Background technology
At present, temperature sampling circuit be present in the related equipment of most household electrical appliance, but pass through temperature sampling
The main reason for temperature sampling value that circuit obtains is inaccurate, causes this problem is the temperature sensing device in temperature sampling circuit
As thermistor has the limitation of itself.For example, thermistor be a kind of resistance with temperature change continually changing electricity
Sub- device, the slope of its change in resistance can change also with temperature change.For different thermistors, its thermal characteristics
It is different, in different temperature ranges, the slope of its change in resistance is to differ.For example, some thermistors are in a temperature
Spend in section, the slope of its change in resistance has greatly changed with the change of temperature, and some thermistors are at another
In temperature range, the slope of its change in resistance has greatly changed with the change of temperature.If thermistor is at some
In temperature range, the slope of its change in resistance has greatly changed with the change of temperature, then shows that the thermistor exists
It is sensitiveer in corresponding temperature range.
At present, the circuit that temperature sampling is carried out by thermistor typically samples to voltage parameter, and utilizes resistance
The corresponding relation of value and temperature is to obtain temperature parameter.It following is a brief introduction of lower direct temperature sample circuit and indirect temperature sampling
Circuit, as shown in figure 1, direct temperature sample circuit includes：Current-limiting resistance R101, thermistor RT101, divider resistance R102 and
Filter capacitor C101, its operation principle is that temperature parameter is converted into voltage parameter, and voltage parameter is sampled, Ji Jiangre
The voltage parameter at quick resistance RT101 both ends is sampled, and is sent to main control chip.As shown in Fig. 2 indirect temperature sample circuit
Including：Current-limiting resistance R201, thermistor RT201, divider resistance R202 and filter capacitor C201, it is by divider resistance R202 two
The voltage parameter at end is sampled, and is sent to main control chip.In actual applications, either direct or indirect temperature is adopted
Sample circuit, it is by the thermistor detection temperature parameter of a specification, can so causes temperature sampling value by temperature-sensitive electricity
The limitation of temperature change sensitivity is hindered, accurate temperature sampling value can not be obtained in the temperature range of its Temperature Insensitive.
Therefore, the method for currently acquired temperature sampling value could be improved.
Utility model content
The utility model is intended to one of technical problem at least solving in above-mentioned technology to a certain extent.
Therefore, a purpose of the present utility model is to propose a kind of segmentation temperature measuring equipment, the temperature of sampling can be widened
Scope, so as to improve the accuracy of temperature sampling value.
Second purpose of the present utility model is to propose a kind of cooking appliance.
To reach above-mentioned purpose, the utility model first aspect proposes a kind of segmentation temperature measuring equipment, including：Temperature sampling
Circuit, the temperature sampling circuit include multiple thermistors, the corresponding temperature detection section of each thermistor, the temperature
Spend sample circuit and temperature sampling is carried out to realize that device under test carries out segmentation thermometric by each thermistor, and export
Corresponding temperature sampling signal；Switching circuit, the switching circuit are connected with the temperature sampling circuit, and the switching circuit is used
In the thermistor for being switched into trip temperature detection work；Control unit, described control unit respectively with the temperature sampling circuit
Output end be connected with the control terminal of the switching circuit, described control unit is currently warm according to the temperature sampling signal acquisition
Sampled value is spent, and the switching circuit is controlled according to the Current Temperatures sampled value.
According to segmentation temperature measuring equipment of the present utility model, by temperature sampling circuit to relative sensitive in different temperatures section
Thermistor carry out temperature sampling, and export corresponding temperature sampling signal to control unit, control unit and adopted according to temperature
Sample signal acquisition Current Temperatures sampled value, and judged whether according to Current Temperatures sampled value by switching circuit to switch progress temperature
The thermistor of degree detection work.The device can widen the temperature range of sampling by switching thermistor, so as to carry
The accuracy of high-temperature sampled value.
In addition, according to the utility model proposes segmentation temperature measuring equipment can also have technical characteristic additional as follows：
Specifically, the high sensitivity temperature range of each thermistor is different, wherein, the high sensitivity humidity province
Between for the temperature-coefficient of electrical resistance of thermistor be more than the temperature range of preset value, and correspond to temperature detection section.
Specifically, when the temperature sampling circuit includes the first thermistor and the second thermistor, the switching circuit
Including convertible contacts type relay, the convertible contacts type relay include coil, the first movable contact, the first stationary contact and
Second stationary contact, first stationary contact correspond to first thermistor and are connected, and second stationary contact corresponds to described second
Thermistor is connected, and the switching circuit is by controlling described in first movable contact with first stationary contact connects or control
First movable contact is connected with second stationary contact to be switched over to first thermistor and second thermistor.
Specifically, the switching circuit also includes：First resistor, one end and the described control unit phase of the first resistor
Even, as the control terminal of switching circuit, to receive the switch-over control signal of described control unit output；First triode, it is described
The base stage of first triode is connected with the other end of the first resistor, the grounded emitter of first triode, and described
The colelctor electrode of one triode is connected with one end of the coil；First electric capacity, first capacitance connection is in the one or three pole
Between the base stage and emitter stage of pipe；First diode, the colelctor electrode of the anode of first diode and first triode
It is connected, the negative electrode of first diode is connected with default power supply, wherein, the other end of the coil is respectively with the described 1st
The negative electrode of pole pipe, the default power supply are connected with first movable contact.
Specifically, the switching circuit also includes：Second resistance, one end and the described control unit phase of the second resistance
Even, as the control terminal of switching circuit, to receive the switch-over control signal of described control unit；Second triode, described second
The base stage of triode is connected with the other end of the second resistance, the grounded collector of second triode, and the described 2nd 3
The emitter stage of pole pipe is connected with one end of the coil；Second electric capacity, second capacitance connection is in second triode
Between base stage and colelctor electrode；Second diode, the anode of second diode are connected with the emitter stage of second triode,
The negative electrode of second diode is connected with default power supply, wherein, the other end of the coil respectively with second diode
Negative electrode, the default power supply is connected with first movable contact.
Specifically, the temperature sampling circuit also includes：3rd resistor, one end of the 3rd resistor and the described first heat
One end of quick resistance is connected after being connected with first stationary contact, the other end of the 3rd resistor and first thermistor
The other end be connected；4th resistance, one end of the 4th resistance be connected with one end of second thermistor after with it is described
Second stationary contact is connected, the other end of the 4th resistance be connected with the other end of second thermistor after with the described 3rd
The other end of resistance is connected；5th resistance, one end of the 5th resistance respectively with the other end of the 4th resistance and described
The other end of 3rd resistor is connected, the other end ground connection of the 5th resistance；6th resistance, one end difference of the 6th resistance
It is connected with the other end of the 4th resistance and the other end of the 3rd resistor, described in the other end conduct of the 6th resistance
The output end of temperature sampling circuit；3rd electric capacity, one end of the 3rd electric capacity are connected with the other end of the 6th resistance, institute
State the 3rd electric capacity the other end be connected with the other end of the 5th resistance after be grounded.
Specifically, the switching circuit also includes the 7th resistance, the 7th resistance be connected to first movable contact with
Between the other end of the coil.
Specifically, the temperature sampling circuit also includes：8th resistance, one end of the 8th resistance are dynamic with described first
Contact is connected, the output end of the other end of the 8th resistance as the temperature sampling circuit；4th electric capacity, the 4th electricity
One end of appearance is connected with the other end of the 8th resistance, the other end of the 4th electric capacity respectively with first thermistor
The other end be connected with the other end of second thermistor after be grounded, one end of first thermistor and described first
Stationary contact is connected, and one end of second thermistor is connected with second stationary contact.
To reach above-mentioned purpose, the utility model also proposed a kind of cooking appliance, including above-mentioned segmentation temperature measuring equipment.
, can by switching thermistor using above-mentioned segmentation temperature measuring equipment according to cooking appliance of the present utility model
The temperature range of sampling is widened, so as to improve the accuracy of temperature sampling value.
In addition, according to the utility model proposes cooking appliance can also have technical characteristic additional as follows：
Specifically, the cooking appliance is electromagnetic oven.
Brief description of the drawings
Fig. 1 is the schematic diagram according to the direct temperature sample circuit of the utility model one embodiment；
Fig. 2 is the schematic diagram according to the indirect temperature sample circuit of the utility model one embodiment；
Fig. 3 is the block diagram according to the segmentation temperature measuring equipment of the utility model embodiment；
Fig. 4 is the circuit diagram of the segmentation temperature measuring equipment sampled indirectly according to the NPN type of the utility model one embodiment；
Fig. 5 is the circuit diagram of the segmentation temperature measuring equipment directly sampled according to the NPN type of the utility model one embodiment；
Fig. 6 is the circuit diagram of the segmentation temperature measuring equipment sampled indirectly according to the positive-negative-positive of the utility model one embodiment；
Fig. 7 is the circuit diagram of the segmentation temperature measuring equipment directly sampled according to the positive-negative-positive of the utility model one embodiment；
Fig. 8 is the flow chart according to the segmentation temp measuring method of the utility model one embodiment；And
Fig. 9 is the block diagram according to the cooking appliance of the utility model embodiment.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
The segmentation temperature measuring equipment of the utility model embodiment and cooker described below in conjunction with the accompanying drawings.
Fig. 3 is the block diagram according to the segmentation temperature measuring equipment of the utility model embodiment.
Need, in embodiment of the present utility model, segmentation temperature measuring equipment can be applied to cooking appliance such as electromagnetism
In the equipment of the needs such as stove heating.
As shown in figure 3, the segmentation temperature measuring equipment of the utility model embodiment, including：Temperature sampling circuit 10, switching circuit
20 and control unit 30.
Wherein, temperature sampling circuit 10 may include multiple thermistors, the corresponding temperature detection area of each thermistor
Between, temperature sampling circuit 10 carries out temperature sampling to realize that device under test carries out segmentation thermometric by each thermistor, and
Export corresponding temperature sampling signal.Switching circuit 20 is connected with temperature sampling circuit 10, and switching circuit 20, which is used to switch, to be carried out
The thermistor of temperature detection work.Control unit 30 respectively with the output end T of temperature sampling circuit 10 and switching circuit 20
Control terminal CONTROL is connected, and control unit 30 is according to temperature sampling signal acquisition Current Temperatures sampled value, and according to Current Temperatures
Sampled value is controlled to switching circuit 20.
In one embodiment of the present utility model, because the specification of each thermistor is different with material so that each
The high sensitivity temperature range of thermistor is different, wherein, high sensitivity temperature range is the temperature-coefficient of electrical resistance of thermistor
More than the temperature range of preset value, and correspond to temperature detection section.Preset value can be set according to actual conditions, for example,
Temperature value of the preset value as switching can be set in control unit 30 (such as main control chip) in advance.
In order to improve the accuracy of temperature sampling value, multiple high sensitivity temperature ranges may be selected not in temperature sampling circuit 10
Same thermistor.Temperature sampling is carried out to thermistor by temperature sampling circuit 10, and passes through temperature sampling circuit 10
Output end T exports corresponding temperature sampling signal, and control unit 30 can real-time reception temperature sampling signal and according to temperature sampling
Signal acquisition Current Temperatures sampled value, and judge the relation between Current Temperatures sampled value and preset value.If Current Temperatures are adopted
Sample value is less than preset value, then the not output switching signal of control unit 30, and the control terminal CONTROL of switching circuit 20, which is not received, to be cut
Change signal, you can keep original working condition.And if Current Temperatures sampled value is more than or equal to preset value, then control unit 30
Output switching signal, the control terminal CONTROL of switching circuit 20 can be switched after switching signal is received by switching circuit 20
Carry out the thermistor of temperature detection work.
In one embodiment of the present utility model, as shown in Figures 4 to 7, temperature sampling circuit 10 may include the first heat
When quick resistance RT1 and the second thermistor RT2, switching circuit 20 includes convertible contacts type relay Relay, convertible contacts
Type relay Relay may include coil 21, the first movable contact 22, the first stationary contact 23 and the second stationary contact 24, the first stationary contact
23 corresponding first thermistor RT1 are connected, and the corresponding second thermistor RT2 of the second stationary contact 24 is connected, and switching circuit 20 passes through
The first movable contact 22 is controlled to connect or control the first movable contact 22 to be connected with the second stationary contact 24 with to the first stationary contact 23
One thermistor RT1 and the second thermistor RT2 are switched over.
For example, the first thermistor RT1 of temperature sampling circuit 10 can be the thermistor of cryogenic temperature detection, and
Its temperature detection section for [T1, Ta), the second thermistor RT2 can be high-temperature temperature detection thermistor, and its temperature examine
It is [Ta, T2] to survey section.When the Current Temperatures sampled value that temperature sampling circuit 10 obtains is less than preset value Ta, control unit 30
Not output switching signal, the control terminal CONTROL of switching circuit 20 do not receive switching signal, and the first movable contact 22 keeps original
Working condition, that is, keep connected with the first stationary contact 23 so that the first thermistor RT1 is sampled.And work as temperature sampling
When the Current Temperatures sampled value that circuit 10 obtains is more than or equal to preset value Ta, the output switching signal of control unit 30, switching circuit
20 control terminal CONTROL receives switching signal, and the convertible contacts type relay Relay of switching circuit 20 coil 21 obtains
Electricity, and then the first movable contact 22 connects the second stationary contact 24, switches to the second thermistor RT2 to be sampled.
In order to further illustrate the segmentation temperature measuring equipment of the utility model embodiment, as shown in Figures 4 to 7, here with 4
Segmentation temperature measuring equipment illustrates.Wherein, the triode in the switching circuit 20 in Fig. 4 and Fig. 5 segmentation temperature measuring equipment can be adopted
With NPN type triode, the triode in switching circuit 20 in Fig. 6 and Fig. 7 segmentation temperature measuring equipment can use the pole of positive-negative-positive three
Manage, the temperature sampling circuit 10 in segmentation temperature measuring equipment in Fig. 5 and Fig. 7 is that direct temperature samples, the segmentation in Fig. 4 and Fig. 6
Temperature sampling circuit 10 in temperature measuring equipment is indirect temperature sampling.
Fig. 4 is the circuit diagram of the segmentation temperature measuring equipment sampled indirectly according to the NPN type of the utility model one embodiment.
As shown in figure 4, switching circuit 20 may also include：First resistor R1, the first triode Q1, the first electric capacity C1 and first
Diode D1.First resistor R1 one end is connected with control unit 30, as the control terminal CONTROL ends of switching circuit 20, with
The switch-over control signal that reception control unit 30 exports.First triode Q1 base stage (B poles) and the first resistor R1 other end
It is connected, the first triode Q1 emitter stage (E poles) is grounded GND, the first triode Q1 colelctor electrode (C poles) and one end of coil 21
It is connected.First electric capacity C1 is connected between the first triode Q1 base stage (B poles) and emitter stage (E poles).First diode D1's
Anode is connected with the first triode Q1 colelctor electrode (C poles), and the first diode D1 negative electrode is connected with default power supply VCC.Wherein,
The negative electrode with the first diode D1, default power supply VCC and the first movable contact 22 are connected the other end of coil 21 respectively.
As shown in figure 4, temperature sampling circuit 10 may also include：3rd resistor R3, the 4th resistance R4, the 5th resistance R5,
Six resistance R6 and the 3rd electric capacity C3.3rd resistor R3 one end be connected with the first thermistor RT1 one end after with the first stationary contact
Point 23 is connected, and the 3rd resistor R3 other end is connected with the first thermistor RT1 other end.4th resistance R4 one end and the
Two thermistor RT2 one end is connected after being connected with the second stationary contact 24, the 4th resistance the R4 other end and the second thermistor
The RT2 other end is connected after being connected with 3rd resistor R3 and the first thermistor RT1 other end.5th resistance R5 one end point
It is not connected with the 4th resistance R4 other end and the 3rd resistor R3 other end, the 5th resistance R5 other end ground connection GND.6th
Resistance R6 one end respectively the other end with the 4th resistance R4, the 3rd resistor R3 other end, the first thermistor RT1 it is another
End is connected with the second thermistor RT2 other end, the output of the 6th resistance R6 other end as temperature sampling circuit 10
Hold T.3rd electric capacity C3 one end is connected with the 6th resistance R6 other end, the 3rd electric capacity C3 other end and the 5th resistance R5's
The other end is grounded GND after being connected.Wherein, the 5th resistance R5 is divider resistance, and the 6th resistance R6 is current-limiting resistance, the 3rd electric capacity C3
For filter capacitor.
Specifically, the control source at the 5th resistance R5 both ends can be realized that indirect temperature samples to control unit 30.
The Current Temperatures sampled value that temperature sampling circuit 10 obtains is when being less than preset value Ta, the not output switching signal of control unit 30, cuts
The control terminal CONTROL for changing circuit 20 does not receive switching signal, and the first movable contact 22 keeps original working condition, that is, kept
Connected with the first stationary contact 23, the first thermistor RT1 work of temperature sampling circuit 10.Obtained in temperature sampling circuit 10
When Current Temperatures sampled value is more than or equal to preset value Ta, control unit 30 exports high-level control signal, the control of switching circuit 20
End CONTROL processed receives high-level control signal, and the first triode Q1 base stage (B poles) is high level, the first triode Q1
Conducting, the convertible contacts type relay Relay of switching circuit 20 coil 21 must be electric, and then the first movable contact 22 connection second
Stationary contact 24, switching the second thermistor RT2 samplings.
Fig. 5 is the circuit diagram of the segmentation temperature measuring equipment directly sampled according to the NPN type of the utility model one embodiment.
As shown in figure 5, switching circuit 20 may also include：First resistor R1, the first triode Q1, the first electric capacity C1 and first
Diode D1.First resistor R1 one end is connected with control unit 30, single to receive control as the control terminal of switching circuit 20
The switch-over control signal of the output of member 30.First triode Q1 base stage (B poles) is connected with the first resistor R1 other end, and the one or three
Pole pipe Q1 emitter stage (E poles) ground connection GND, the first triode Q1 colelctor electrode (C poles) are connected with one end of coil 21.First electricity
Hold C1 to be connected between the first triode Q1 base stage (B poles) and emitter stage (E poles).First diode D1 anode and the one or three
Pole pipe Q1 colelctor electrode (C poles) is connected, and the first diode D1 negative electrode is connected with default power supply VCC.Wherein, coil 21 is another
The negative electrode with the first diode D1, default power supply VCC and the first movable contact 22 are connected respectively at end.
As shown in figure 5, switching circuit 20 may also include the 7th resistance R7, the 7th resistance R7 be connected to the first movable contact 22 with
Between the other end of coil 21.Wherein, the 7th resistance R7 is divider resistance.
As shown in figure 5, temperature sampling circuit 10 may also include：8th resistance R8 and the 4th electric capacity C4.8th resistance R8's
One end is connected with the first movable contact 22, the output end T of the 8th resistance R8 other end as temperature sampling circuit 10.4th electric capacity
C4 one end is connected with the 8th resistance R8 other end, and the 4th electric capacity C4 other end is another with the first thermistor RT1 respectively
One end is grounded GND, the first thermistor RT1 one end and the first stationary contact after being connected with the second thermistor RT2 other end
23 are connected, and the second thermistor RT2 one end is connected with the second stationary contact 24.Wherein, the 8th resistance R8 is current-limiting resistance, the 4th
Electric capacity C4 is filter capacitor.
Specifically, can be by the control source at the first thermistor RT1 or the second thermistor RT2 both ends to control unit 30
To realize that direct temperature samples.When the Current Temperatures sampled value that temperature sampling circuit 10 obtains is less than preset value Ta, control is single
Output switching signal, the control terminal CONTROL of switching circuit 20 do not receive switching signal to member 30, and the first movable contact 22 is kept
Working condition originally, that is, keep connecting with the first stationary contact 23, the first thermistor RT1 work of temperature sampling circuit 10.
And when the Current Temperatures sampled value that temperature sampling circuit 10 obtains is more than or equal to preset value Ta, control unit 30 exports high level
Control signal.When the control terminal CONTROL of switching circuit 20 receives high-level control signal, the first triode Q1 base stage (B
Pole) it is high level, the first triode Q1 conductings, the convertible contacts type relay Relay of switching circuit 20 coil 21 must be electric,
And then first movable contact 22 connect the second stationary contact 24, switching the second thermistor RT2 sampling.
Fig. 6 is the circuit diagram of the segmentation temperature measuring equipment sampled indirectly according to the positive-negative-positive of the utility model one embodiment.
As shown in fig. 6, switching circuit 20 may also include：Second resistance R2, the second triode Q2, the second electric capacity C2 and second
Diode D2.Second resistance R2 one end is connected with control unit 30, as the control terminal CONTROL of switching circuit 20, to connect
Receive the switch-over control signal of control unit 30.Second triode Q2 base stage (B poles) is connected with the second resistance R2 other end, the
Two triode Q2 colelctor electrode (C poles) ground connection GND, the second triode Q2 emitter stage (E poles) are connected with one end of coil 21.The
Two electric capacity C2 are connected between the second triode Q2 base stage (B poles) and colelctor electrode (C poles).Second diode D2 anode and
Two triode Q2 emitter stage (E poles) is connected, and the second diode D2 negative electrode is connected with default power supply VCC.Wherein, coil 21
The negative electrode with the second diode D2, default power supply VCC and the first movable contact 22 are connected the other end respectively.
As shown in fig. 6, temperature sampling circuit 10 may also include：3rd resistor R3, the 4th resistance R4, the 5th resistance R5,
Six resistance R6 and the 3rd electric capacity C3.3rd resistor R3 one end be connected with the first thermistor RT1 one end after with the first stationary contact
Point 23 is connected, and the 3rd resistor R3 other end is connected with the first thermistor RT1 other end.4th resistance R4 one end and the
Two thermistor RT2 one end is connected after being connected with the second stationary contact 24, the 4th resistance the R4 other end and the second thermistor
The RT2 other end is connected after being connected with 3rd resistor R3 and the first thermistor RT1 other end.5th resistance R5 one end point
It is not connected with the 4th resistance R4 other end and the 3rd resistor R3 other end, the 5th resistance R5 other end ground connection GND.6th
Resistance R6 one end respectively the other end with the 4th resistance R4, the 3rd resistor R3 other end, the first thermistor RT1 it is another
End is connected with the second thermistor RT2 other end, the output of the 6th resistance R6 other end as temperature sampling circuit 10
Hold T.3rd electric capacity C3 one end is connected with the 6th resistance R6 other end, the 3rd electric capacity C3 other end and the 5th resistance R5's
The other end is grounded GND after being connected.Wherein, the 5th resistance R5 is divider resistance, and the 6th resistance R6 is current-limiting resistance, the 3rd electric capacity C3
For filter capacitor.
Specifically, the control source at the 5th resistance R5 both ends can be realized that indirect temperature samples to control unit 30.
The Current Temperatures sampled value that temperature sampling circuit 10 obtains is when being less than preset value Ta, the not output switching signal of control unit 30, cuts
The control terminal CONTROL for changing circuit 20 does not receive switching signal, and the first movable contact 22 keeps original working condition, that is, kept
Connected with the first stationary contact 23, the first thermistor RT1 work of temperature sampling circuit 10.Obtained in temperature sampling circuit 10
When Current Temperatures sampled value is more than or equal to preset value Ta, control unit 30 exports low level control signal.In switching circuit 20
When control terminal CONTROL receives low level control signal, the first triode Q1 base stage (B poles) is low level, the first triode
Q1 is turned on, and the conversion hysteria relay Relay of switching circuit 20 coil 21 must be electric, and then the first movable contact 22 connects the second stationary contact
Point 24, switching the second thermistor RT2 samplings.
The circuit diagram for the segmentation temperature measuring equipment that Fig. 7 directly samples according to the positive-negative-positive of the utility model one embodiment.
As shown in fig. 7, switching circuit 20 may also include：Second resistance R2, the second triode Q2, the second electric capacity C2 and second
Diode D2.Second resistance R2 one end is connected with control unit 30, as the control terminal CONTROL of switching circuit 20, to connect
Receive the switch-over control signal of control unit 30.Second triode Q2 base stage (B poles) is connected with the second resistance R2 other end, the
Two triode Q2 colelctor electrode (C poles) ground connection GND, the second triode Q2 emitter stage (E poles) are connected with one end of coil 21.The
Two electric capacity C2 are connected between the second triode Q2 base stage (B poles) and colelctor electrode (C poles).Second diode D2 anode and
Two triode Q2 emitter stage (E poles) is connected, and the second diode D2 negative electrode is connected with default power supply VCC.Wherein, coil 21
The negative electrode with the second diode D2, default power supply VCC and the first movable contact 22 are connected the other end respectively.
As shown in fig. 7, switching circuit 20 also includes the 7th resistance R7, the 7th resistance R7 is connected to the first movable contact 22 and line
Between the other end of circle 21.Wherein, the second triode Q2 can be PNP type triode.
As shown in fig. 7, temperature sampling circuit 10 may also include：8th resistance R8 and the 4th electric capacity C4.8th resistance R8's
One end is connected with the first movable contact 22, the output end T of the 8th resistance R8 other end as temperature sampling circuit 10.4th electric capacity
C4 one end is connected with the 8th resistance R8 other end, and the 4th electric capacity C4 other end is another with the first thermistor RT1 respectively
One end is grounded GND, the first thermistor RT1 one end and the first stationary contact after being connected with the second thermistor RT2 other end
23 are connected, and the second thermistor RT2 one end is connected with the second stationary contact 24.
Specifically, can be by the control source at the first thermistor RT1 or the second thermistor RT2 both ends to control unit 30
To realize that direct temperature samples.When the Current Temperatures sampled value that temperature sampling circuit 10 obtains is less than preset value Ta, control is single
Output switching signal, the control terminal CONTROL of switching circuit 20 do not receive switching signal to member 30, and the first movable contact 22 is kept
Working condition originally, that is, keep connecting with the first stationary contact 23, the first thermistor RT1 work of temperature sampling circuit 10.
And when the Current Temperatures sampled value that temperature sampling circuit 10 obtains is more than or equal to preset value Ta, control unit 30 exports low level
Control signal.When the control terminal CONTROL of switching circuit 20 receives low level control signal, the first triode Q1 base stage (B
Pole) it is low level, the first triode Q1 conductings, the convertible contacts type relay Relay of switching circuit 20 coil 21 must be electric,
And then first movable contact 22 connect the second stationary contact 24, switching the second thermistor RT2 sampling.
In actual applications, can also be by increasing temperature range not on the basis of Fig. 4 to Fig. 7 segmentation temperature measuring equipment
With highly sensitive thermistor, other types of relay, resistance, diode and electric capacity etc. to enter to temperature sampling circuit
Row extension, can at least be divided into two, further to improve the accuracy of temperature sampling value by temperature detection section.
In a specific embodiment of the present utility model, in temperature sampling circuit 10 number of thermistor can be more than etc.
In three, wherein, the high sensitivity temperature range of each thermistor is different.
It is assumed that temperature sampling circuit 10 may include N number of thermistor RT1 to RTN (N 2,3 ... N), RT1 to RTN difference
A corresponding highly sensitive temperature detection section.The RT1 for first passing through temperature sampling circuit 10 carries out temperature sampling, and exports phase
The temperature sampling signal answered, control unit 30 receive temperature sampling signal and sampled according to temperature sampling signal acquisition Current Temperatures
Whether value, further judge Current Temperatures sampled value in RT1 highly sensitive temperature detection section.It is if it is, logical
Cross RT1 and carry out temperature sampling.If it is not, then passing sequentially through RT2 to RTN carries out temperature sampling, until control unit 30 judges to work as
Preceding temperature sampling value is in the highly sensitive temperature detection section corresponding to some thermistor in RT2 to RTN, i.e.,
Temperature sampling can be carried out by the thermistor.
Illustrated below so that temperature sampling circuit 10 includes three thermistors RT11, RT12, RT13 as an example, RT11,
High sensitivity temperature detection section corresponding to RT12, RT13 be respectively [Tb, Tc), [and Tc, Td) and [Td, Te].It can control in advance
The temperature value that switching is set in unit 30 processed is respectively the first preset value Tc and the second preset value Td.Wherein, the first preset value Tc
Less than the second preset value Td.
First pass through temperature sampling circuit 10 and temperature sampling is carried out to RT11, and export corresponding temperature sampling signal, control
Unit 30 receives temperature sampling signal and according to temperature sampling signal acquisition Current Temperatures sampled value, further judges current temperature
The relation spent between sampled value and the first preset value Tc.If Current Temperatures sampled value is less than the first preset value Tc, control is single
The not output switching signal of member 30, you can temperature sampling is carried out by RT1.And if Current Temperatures sampled value is pre- more than or equal to first
If value Tc, then the output switching signal of control unit 30, switches to RT2 to carry out temperature sampling.
After switching to RT2 to carry out temperature sampling, temperature sampling circuit 10 exports corresponding temperature sampling signal, and control is single
Member 30 receives temperature sampling signal according to temperature sampling signal acquisition Current Temperatures sampled value, further judges that Current Temperatures are adopted
Relation between sample value and the second preset value Td.If Current Temperatures sampled value is less than the second preset value Td, control unit 30
Not output switching signal, temperature sampling can be carried out by RT2.And if Current Temperatures sampled value is more than or equal to the second preset value
Td, then the output switching signal of control unit 30, switches to RT3 to carry out temperature sampling.
Fig. 8 is the flow chart according to the segmentation temp measuring method of the utility model one embodiment.As shown in figure 8, this practicality
The segmentation temp measuring method of new embodiment, it may include following steps：
S101, obtain Current Temperatures sampled value.
S102, judges whether Current Temperatures sampled value is more than or equal to preset value Ta.If it is, perform step S103；If
It is no, perform step S106.
S103, main control chip output switching signal.
S104, the second thermistor RT2 is switched to be sampled.
S105, such as sampled in high-temperature temperature detection interval on [Ta, T2].After execution of step S105, it can return to
Step S101 circulations perform above-mentioned steps.
S106, main control chip not output switching signal.It should be noted that for NPN type segmentation temperature measuring equipment, in master control
When chip exports high level, switching circuit receives switching signal, and when main control chip exports low level, switching circuit, which connects, not to be received
To receiving switching signal.Temperature measuring equipment is segmented for positive-negative-positive, when main control chip exports low level, switching circuit receives
Output switching signal, when main control chip exports high level, switching circuit, which connects not receive, receives switching signal.
S107, the first thermistor RT1 are sampled.
S108, cryogenic temperature detection interval as [T1, Ta) on sampled.After execution of step S108, it can return to
Step S101 circulations perform above-mentioned steps.
In summary, according to segmentation temperature measuring equipment of the present utility model, by temperature sampling circuit to different humidity provinces
The thermistor of interior relative sensitive carries out temperature sampling, and it is single to control unit, control to export corresponding temperature sampling signal
Member judges whether to pass through switching circuit according to temperature sampling signal acquisition Current Temperatures sampled value according to Current Temperatures sampled value
To be switched into the thermistor of trip temperature detection work.The device, the temperature model of sampling can be widened by switching thermistor
Enclose, so as to improve the accuracy of temperature sampling value.
Based on above-described embodiment, the utility model also proposed a kind of cooking appliance 1000.
Fig. 9 is the block diagram according to the cooking appliance of the utility model embodiment.As shown in figure 9, the utility model
The cooking appliance 1000 of embodiment, include the segmentation temperature measuring equipment 100 of above-described embodiment.
It should be noted that the details not disclosed in the cooking appliance 1000 of the utility model embodiment, refer to this reality
The details disclosed in segmentation temperature measuring equipment 100 with new embodiment, specific I will not elaborate.
In one embodiment of the present utility model, cooking appliance can be electromagnetic oven.
, can by switching thermistor using above-mentioned segmentation temperature measuring equipment according to cooking appliance of the present utility model
The temperature range of sampling is widened, so as to improve the accuracy of temperature sampling value.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ",
The orientation or position relationship of the instruction such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on shown in the drawings
Orientation or position relationship, it is for only for ease of description the utility model and simplifies description, rather than indicates or imply signified dress
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the utility model
Limitation.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include one or more this feature.In description of the present utility model, " multiple " are meant that two or two
More than, unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be
Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be two
The connection of element internal or the interaction relationship of two elements.For the ordinary skill in the art, can basis
Concrete condition understands concrete meaning of the above-mentioned term in the utility model.
In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature
Can be that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, first is special
Sign second feature " on ", " top " and " above " can be fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height and be less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present utility model.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the different embodiments or example and the feature of different embodiments or example described in this specification can be entered
Row combines and combination.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in the scope of the utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (10)
1. one kind segmentation temperature measuring equipment, it is characterised in that including：
Temperature sampling circuit, the temperature sampling circuit include multiple thermistors, the corresponding temperature inspection of each thermistor
Section is surveyed, the temperature sampling circuit carries out temperature sampling to realize that device under test is divided by each thermistor
Section thermometric, and export corresponding temperature sampling signal；
Switching circuit, the switching circuit are connected with the temperature sampling circuit, and the switching circuit is used to be switched into trip temperature
Detect the thermistor of work；
Control unit, described control unit respectively with the output end of the temperature sampling circuit and the control terminal of the switching circuit
It is connected, described control unit is adopted according to the temperature sampling signal acquisition Current Temperatures sampled value according to the Current Temperatures
Sample value is controlled to the switching circuit.
2. segmentation temperature measuring equipment according to claim 1, it is characterised in that the high sensitivity temperature of each thermistor
It is different to spend section, wherein, the high sensitivity temperature range is more than the temperature of preset value for the temperature-coefficient of electrical resistance of thermistor
Section, and correspond to temperature detection section.
3. segmentation temperature measuring equipment according to claim 1, it is characterised in that the temperature sampling circuit includes the first temperature-sensitive
When resistance and the second thermistor, the switching circuit includes convertible contacts type relay, the convertible contacts type relay
Device includes coil, the first movable contact, the first stationary contact and the second stationary contact, and first stationary contact corresponds to the first temperature-sensitive electricity
Resistance is connected, and second stationary contact corresponds to second thermistor and is connected, and the switching circuit is moved by controlling described first
Contact connects or controlled first movable contact to be connected with second stationary contact with to described first with first stationary contact
Thermistor and second thermistor switch over.
4. segmentation temperature measuring equipment according to claim 3, it is characterised in that the switching circuit also includes：
First resistor, one end of the first resistor are connected with described control unit, as the control terminal of switching circuit, to receive
The switch-over control signal of described control unit output；
First triode, the base stage of first triode are connected with the other end of the first resistor, first triode
Grounded emitter, the colelctor electrode of first triode is connected with one end of the coil；
First electric capacity, first capacitance connection is between the base stage of first triode and emitter stage；
First diode, the anode of first diode are connected with the colelctor electrode of first triode, the one or two pole
The negative electrode of pipe is connected with default power supply, wherein, the other end of the coil negative electrode with first diode, described pre- respectively
If power supply is connected with first movable contact.
5. segmentation temperature measuring equipment according to claim 3, it is characterised in that the switching circuit also includes：
Second resistance, one end of the second resistance are connected with described control unit, as the control terminal of switching circuit, to receive
The switch-over control signal of described control unit；
Second triode, the base stage of second triode are connected with the other end of the second resistance, second triode
Grounded collector, the emitter stage of second triode is connected with one end of the coil；
Second electric capacity, second capacitance connection is between the base stage of second triode and colelctor electrode；
Second diode, the anode of second diode are connected with the emitter stage of second triode, the two or two pole
The negative electrode of pipe is connected with default power supply, wherein, the other end of the coil negative electrode with second diode, described pre- respectively
If power supply is connected with first movable contact.
6. the segmentation temperature measuring equipment according to claim 4 or 5, it is characterised in that the temperature sampling circuit also includes：
3rd resistor, one end of the 3rd resistor be connected with one end of first thermistor after with first stationary contact
It is connected, the other end of the 3rd resistor is connected with the other end of first thermistor；
4th resistance, one end of the 4th resistance be connected with one end of second thermistor after with second stationary contact
It is connected, the other end of the 4th resistance is connected another with the 3rd resistor afterwards with the other end of second thermistor
End is connected；
5th resistance, one end of the 5th resistance are another with the other end of the 4th resistance and the 3rd resistor respectively
End is connected, the other end ground connection of the 5th resistance；
6th resistance, one end of the 6th resistance are another with the other end of the 4th resistance and the 3rd resistor respectively
End is connected, the output end of the other end of the 6th resistance as the temperature sampling circuit；
3rd electric capacity, one end of the 3rd electric capacity are connected with the other end of the 6th resistance, the 3rd electric capacity it is another
End is grounded after being connected with the other end of the 5th resistance.
7. the segmentation temperature measuring equipment according to claim 4 or 5, it is characterised in that the switching circuit also includes the 7th electricity
Resistance, the 7th resistance are connected between first movable contact and the other end of the coil.
8. segmentation temperature measuring equipment according to claim 7, it is characterised in that the temperature sampling circuit also includes：
8th resistance, one end of the 8th resistance are connected with first movable contact, the other end conduct of the 8th resistance
The output end of the temperature sampling circuit；
4th electric capacity, one end of the 4th electric capacity are connected with the other end of the 8th resistance, the 4th electric capacity it is another
End is grounded after being connected respectively with the other end of first thermistor and the other end of second thermistor, and described first
One end of thermistor is connected with first stationary contact, one end of second thermistor and the second stationary contact phase
Even.
9. a kind of cooking appliance, it is characterised in that including the segmentation temperature measuring equipment according to any one of claim 1-8.
10. cooking appliance according to claim 9, it is characterised in that the cooking appliance is electromagnetic oven.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720762562.9U CN206847815U (en) | 2017-06-27 | 2017-06-27 | It is segmented temperature measuring equipment and cooking appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720762562.9U CN206847815U (en) | 2017-06-27 | 2017-06-27 | It is segmented temperature measuring equipment and cooking appliance |
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| Publication Number | Publication Date |
|---|---|
| CN206847815U true CN206847815U (en) | 2018-01-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547022A (en) * | 2018-10-31 | 2019-03-29 | 杭州领乘信息技术有限公司 | A kind of acquisition range is wide and temperature collection circuit with high accuracy and method |
| CN110209101A (en) * | 2019-07-09 | 2019-09-06 | 广东美的厨房电器制造有限公司 | Detection circuit and cooking apparatus |
| CN112710407A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and temperature measuring device and temperature measuring method thereof |
| CN114199403A (en) * | 2021-12-07 | 2022-03-18 | 珠海格力电器股份有限公司 | Temperature sampling device, control method thereof and motor control system |
| CN114642356A (en) * | 2021-12-28 | 2022-06-21 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking appliance, upward pressure detection method, computer-readable storage medium and processor |
-
2017
- 2017-06-27 CN CN201720762562.9U patent/CN206847815U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547022A (en) * | 2018-10-31 | 2019-03-29 | 杭州领乘信息技术有限公司 | A kind of acquisition range is wide and temperature collection circuit with high accuracy and method |
| CN110209101A (en) * | 2019-07-09 | 2019-09-06 | 广东美的厨房电器制造有限公司 | Detection circuit and cooking apparatus |
| CN112710407A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and temperature measuring device and temperature measuring method thereof |
| CN114199403A (en) * | 2021-12-07 | 2022-03-18 | 珠海格力电器股份有限公司 | Temperature sampling device, control method thereof and motor control system |
| CN114642356A (en) * | 2021-12-28 | 2022-06-21 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking appliance, upward pressure detection method, computer-readable storage medium and processor |
| CN114642356B (en) * | 2021-12-28 | 2023-10-20 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking appliance, up-press detection method, computer-readable storage medium, and processor |
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