CN105371977B - Temperature-detecting device and barbecue utensil - Google Patents
Temperature-detecting device and barbecue utensil Download PDFInfo
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- CN105371977B CN105371977B CN201510866895.1A CN201510866895A CN105371977B CN 105371977 B CN105371977 B CN 105371977B CN 201510866895 A CN201510866895 A CN 201510866895A CN 105371977 B CN105371977 B CN 105371977B
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Abstract
The invention discloses a kind of temperature-detecting device and there is its barbecue utensil, described device includes：Temperature sensor；First bleeder circuit, there is first node between one end of the first bleeder circuit and the other end of temperature sensor；Multiple second bleeder circuits, the first end of each second bleeder circuit is connected to be connected with first node afterwards, and the second end of each second bleeder circuit is connected to be connected with default power supply afterwards；Control unit, the sampling end of control unit is connected with first node, multiple control output ends of control unit are corresponding with the 3rd end of each second bleeder circuit to be connected, and control unit controls at least one second bleeder circuit in multiple second bleeder circuits to be operated when the temperature value for judging that temperature sensor detects is less than preset voltage value more than the magnitude of voltage of preset temperature value and first node.The accuracy of detection of the temperature-detecting device is high, and has wider temperature detection range, and accurately short circuit or open circuit whether can occur by detection temperature sensor.
Description
Technical field
The present invention relates to household electrical appliance technical field, more particularly to a kind of temperature-detecting device and one kind have the temperature
The barbecue utensil of detection means.
Background technology
In barbecue utensil (such as electric oven), in order to control cavity temperature in setting range, cavity temperature need to be carried out
Detection.
Generally, cavity temperature detection method be by after temperature sensor and the resistant series of a fixed resistance value with power supply simultaneously
Connection, then the contact of temperature sensor and resistance is connected to the input of control chip.When the temperature varies, temperature passes
The resistance of sensor will change therewith, and the junction voltage of temperature sensor and resistance also changes therewith, and therefore, control chip leads to
Cross docking point voltage and be acquired and change the temperature that can obtain furnace chamber.But the accuracy of detection of the detection method is than relatively low,
And temperature detection range is narrow, and accurately open circuit or short circuit whether can not occur by detection temperature sensor.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of temperature-detecting device, and the accuracy of detection of the device is high and temperature detection range is wider, and
It can accurately detect whether temperature sensor occurs open circuit or short circuit.
It is another object of the present invention to propose a kind of barbecue utensil.
To achieve the above object, one aspect of the present invention embodiment proposes a kind of temperature-detecting device, including：TEMP
Device, one end ground connection of the temperature sensor；First bleeder circuit, one end and the TEMP of first bleeder circuit
The other end of device is connected, and the other end of first bleeder circuit is connected with default power supply, one end of first bleeder circuit
There is first node between the other end of the temperature sensor；Multiple second bleeder circuits, the multiple second partial pressure electricity
The first end of each second bleeder circuit in road is connected after being connected together with the first node, each second partial pressure
Second end of circuit is connected after being connected together with the default power supply；Control unit, described control unit have sampling end and
Multiple control output ends, the sampling end are connected with the first node, the multiple control output end and described each second
3rd end of bleeder circuit is corresponding to be connected, and described control unit samples what the temperature sensor detected by the sampling end
Temperature value, and judging that temperature value that the temperature sensor detects is more than the voltage of preset temperature value and the first node
Value controls at least one second bleeder circuit in the multiple second bleeder circuit to be operated when being less than preset voltage value.
Temperature-detecting device according to embodiments of the present invention, when the temperature value that temperature sensor detects is more than preset temperature
When the magnitude of voltage of value and first node is less than preset voltage value, by controlling at least one second in multiple second bleeder circuits
Bleeder circuit is operated, so that the magnitude of voltage at first node is kept in the reasonable scope, so as to ensure the essence of temperature detection
Degree, and there is wider temperature detection range, while can accurately detect whether temperature sensor occurs open circuit or short circuit.
According to one embodiment of present invention, first bleeder circuit includes：First divider resistance, first partial pressure
One end of resistance is connected with the other end of the temperature sensor, the other end of first divider resistance and the default power supply
It is connected.
Further, the circuit structure of the multiple second bleeder circuit is identical, in the multiple second bleeder circuit
Each second bleeder circuit includes：First resistor, one end of the first resistor are connected with the first node；First switch
Pipe, the first end of the first switch pipe is connected with the other end of the first resistor, the second end of the first switch pipe and
The default power supply is connected；Second resistance, one end of the second resistance is connected with the control terminal of the first switch pipe, described
The other end of second resistance is connected with corresponding control output end.
Further, the resistance of the first resistor in the multiple second bleeder circuit differs, and is respectively less than described
The resistance of first divider resistance.
According to one embodiment of present invention, described temperature-detecting device, in addition to：Current-limiting resistance, the current limliting electricity
Resistance is arranged between the first node and the sampling end.
According to one embodiment of present invention, the temperature sensor is thermistor.
Further, the thermistor is also parallel with the first electric capacity.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of barbecue utensil, and it includes above-mentioned temperature
Spend detection means.
The barbecue utensil of the embodiment of the present invention, can be within the scope of wider temperature by above-mentioned temperature-detecting device
Realization is precisely controlled to temperature, while can accurately detect whether temperature sensor occurs open circuit or short circuit, so as to user
Temperature sensor can be changed in time, prevent barbecue utensil to be damaged.
According to one embodiment of present invention, the barbecue utensil is electric oven.
Brief description of the drawings
Fig. 1 is the block diagram of temperature-detecting device according to an embodiment of the invention.
Fig. 2 is the structural representation of temperature-detecting device according to an embodiment of the invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Fig. 1 is the block diagram of temperature-detecting device according to an embodiment of the invention.As shown in figure 1, the temperature
Detection means includes：Temperature sensor 10, the first bleeder circuit 20, multiple second bleeder circuits and control unit 40.
Wherein, one end ground connection GND of temperature sensor 10, one end of the first bleeder circuit 20 are another with temperature sensor 10
One end is connected, and the other end of the first bleeder circuit 20 is connected with default power supply VCC, and one end and the temperature of the first bleeder circuit 20 pass
There is first node J1 between the other end of sensor 10.The first end of each second bleeder circuit in multiple second bleeder circuits
Be connected after being connected together with first node J1, the second end of each second bleeder circuit be connected together after with default power supply
VCC is connected.Control unit 40 has sampling end and multiple control output ends, and sampling end is connected with first node J1, multiple controls
Output end is corresponding with the 3rd end of each second bleeder circuit to be connected, and control unit 40 passes through sampling end samples temperature sensor 10
The temperature value detected, and judging that temperature value that temperature sensor 10 detects is more than preset temperature value and first node J1
Magnitude of voltage controls at least one second bleeder circuit in multiple second bleeder circuits to be operated when being less than preset voltage value.
In an embodiment of the present invention, preset temperature value and preset voltage value can be demarcated according to actual conditions.Example
Such as, preset voltage value can be [1/4*U, 3/4*U], it is preferable that preset voltage value 1/2*U, wherein, U is default power supply VCC
Voltage.
Specifically, as shown in figure 1, two the second bleeder circuits can be included in temperature-detecting device, respectively second point
The bleeder circuit 32 of volt circuit 31 and second.After temperature-detecting device works on power, the first bleeder circuit 20 is started working, control
Unit 40 carries out modulus by sampling end real-time sampling first node J1 voltage signal, and to first node J1 voltage signal
Conversion is to obtain first node J1 magnitude of voltage, and then control unit 40 obtains temperature according to the relation between magnitude of voltage and temperature value
The temperature value that degree sensor 10 detects.
When the temperature varies, the resistance of temperature sensor 10 will change therewith, it can be seen from voltage divider principle, first segment
Magnitude of voltage at point J1 also changes therewith.For example, when temperature sensor 10 is negative temperature coefficient temperature sensor, if temperature
Very low, then the resistance of temperature sensor 10 is very big, and first node J1 magnitude of voltage is higher；If temperature is very high, temperature passes
The resistance very little of sensor 10, first node J1 magnitude of voltage is than relatively low.In order to improve the precision of temperature detection, in the reality of the present invention
Apply in example, by being controlled to multiple second bleeder circuits, to ensure the magnitude of voltage of first node in rational scope, from
And ensure the precision of temperature detection.
Specifically, the temperature value detected when temperature sensor 10 is very low, and first node J1 magnitude of voltage is higher
When, for example, first node J1 magnitude of voltage between [1/4*U, 3/4*U], represent control unit 40 resolution ratio it is preferable, i.e.,
The ratio of precision of temperature detection is higher, need not now control the second bleeder circuit 31 and the second bleeder circuit 32 to be operated.
When the temperature value that temperature sensor 10 detects is higher, and first node J1 magnitude of voltage than it is relatively low when, such as
When first node J1 magnitude of voltage is less than 1/4*U, represent that the resolution ratio of control unit 40 is relatively low, i.e. the ratio of precision of temperature detection
It is relatively low, now need to control the second bleeder circuit 31 or the second bleeder circuit 32 to be operated, so that first node J1 voltage
Value is increased to [1/4*U, 3/4*U], so as to ensure the accuracy of detection of temperature.
When the temperature value that temperature sensor 10 detects is very high, and the magnitude of voltage at first node J1 than it is relatively low when, such as
When first node J1 magnitude of voltage is less than 1/4*U, represent that the resolution ratio of control unit 40 is very low, i.e., the precision of temperature detection is very
It is low, now need to control the second bleeder circuit 31 and the second bleeder circuit 32 to be operated, so that first node J1 magnitude of voltage
[1/4*U, 3/4*U] is increased to, so as to ensure the accuracy of detection of temperature.
It is understood that in temperature detection process, if temperature sensor is opened a way, the voltage of first node
Value is up to default supply voltage；If short circuit occurs for temperature sensor, the magnitude of voltage of first node is zero.And normal condition
Under, the magnitude of voltage at first node is between [1/4*U, 3/4*U], therefore, can by the sampling of the magnitude of voltage to first node
Accurately to detect whether temperature sensor occurs open circuit or short circuit.
The temperature-detecting device of the embodiment of the present invention, when the temperature value that temperature sensor detects be more than preset temperature value and
When the magnitude of voltage of first node is less than preset voltage value, by controlling at least one second partial pressure in multiple second bleeder circuits
Circuit is operated, so that the magnitude of voltage at first node is kept in the reasonable scope, so as to ensure the precision of temperature detection, and
With wider temperature detection range, while it can accurately detect whether temperature sensor occurs open circuit or short circuit.
According to one embodiment of present invention, as shown in Fig. 2 the first bleeder circuit 20 includes the first divider resistance RF1, the
One divider resistance RF1 one end is connected with the other end of temperature sensor 10, the first divider resistance RF1 other end and default electricity
Source VCC is connected.
The circuit structure of multiple second bleeder circuits is identical, each second bleeder circuit bag in multiple second bleeder circuits
Include：First resistor, first switch pipe and second resistance, one end of first resistor are connected with first node J1, first switch pipe
First end is connected with the other end of first resistor, and the second end of first switch pipe is connected with default power supply VCC, and the one of second resistance
End is connected with the control terminal of first switch pipe, and the other end of second resistance is connected with corresponding control output end.Wherein, Duo Ge
The resistance of first resistor in two bleeder circuits differs, and respectively less than the first divider resistance RF1 resistance.For example, first
First resistor in first resistor R1 the second bleeder circuits of resistance ＞ 32 in divider resistance RF1 the second bleeder circuits of resistance ＞ 31
R3 resistance.
Temperature sensor 10 can be thermistor NTC, and thermistor NTC is also parallel with the first electric capacity C1.
Specifically, temperature-detecting device can be arranged in electric oven to detect cavity temperature.The electrician on electric oven
After work, when cavity temperature is very low, thermistor NTC resistance is very big, control unit 40 control the first control output end R05 and
Second control output end R06 exports high level, so that the first triode Q1 and the second bleeder circuit in the second bleeder circuit 31
The first triode Q2 shut-offs in 32, now only the first divider resistance RF1 connects with thermistor NTC.Due to the first partial pressure
Resistance RF1 resistance is bigger, therefore first node J1 magnitude of voltage is more than 1/2*U, now control unit 40 resolution ratio
Preferably.When cavity temperature changes, thermistor NTC resistance will change therewith, due to the first divider resistance RF1 resistance
Value immobilizes, therefore first node J1 magnitude of voltage will change with thermistor NTC change in resistance, and control unit 40 is logical
Over-sampling first node J1 voltage signal, and it is changed to obtain different temperature values.
With the continuous rising of cavity temperature, thermistor NTC resistance is gradually reduced, when first node J1 magnitude of voltage
During less than 1/2*U, control unit 40 controls the first control output end R05 output low levels, so that in the second bleeder circuit 31
First triode Q1 is turned on, while controls the second control output end R06 output high level, so that the in the second bleeder circuit 32
One triode Q2 turn off, now, after the first divider resistance RF1 is in parallel with the first resistor R1 in the second bleeder circuit 31 with temperature-sensitive
Resistance NTC connects.Because the resistance of first resistor R1 in the second bleeder circuit 31 is less than the first divider resistance RF1 resistance, because
This first node J1 magnitude of voltage will be greater than 1/2*U.Due to first resistor in the first divider resistance RF1 and the second bleeder circuit 31
R1 resistance immobilizes, and therefore, first node J1 magnitude of voltage will change with thermistor NTC change in resistance, control
Unit 40 processed is changed to obtain different temperature values by sampling first node J1 voltage signal to it.
As cavity temperature continues to rise, thermistor NTC resistance will continue to reduce, when first node J1 magnitude of voltage
During again less than 1/2*U, control unit 40 controls the first control output end R05 and the second control output end R06 to export low electricity
Put down, so that the first triode Q2 in the first triode Q1 and the second bleeder circuit 32 in the second bleeder circuit 31 is both turned on,
Now the first divider resistance RF1, the first resistor R1 in the second bleeder circuit 31 and the first resistor in the second bleeder circuit 32
Connected after R3 parallel connections with thermistor NTC.Due to first resistor in the first divider resistance RF1 the second bleeder circuits of resistance ＞ 31
First resistor R3 resistance in R1 the second bleeder circuits of resistance ＞ 32, therefore first node J1 magnitude of voltage will be greater than 1/2*U.
Due to the first electricity in first resistor R1 resistance in the first divider resistance RF1, the second bleeder circuit 31 and the second bleeder circuit 32
Resistance R3 resistance immobilizes, and therefore, first node J1 magnitude of voltage will change with thermistor NTC change in resistance,
Control unit 40 is changed to obtain different temperature values by sampling first node J1 voltage signal to it.
Control unit 40 judges whether to need on/off relay by accurately detecting cavity temperature, with to cavity temperature
It is precisely controlled.
In this embodiment, because the magnitude of voltage of first node is all the time close to 1/2*U, this causes control unit to have all the time
Optimum resolution, so as to improve the precision of temperature detection, while can accurately detection temperature sensor whether occur open circuit or
Short circuit.It is additionally, since and is connected again with temperature sensor using after multiple resistor coupled in parallel, therefore relative broad range can be measured
Temperature.
According to one embodiment of present invention, as shown in Fig. 2 above-mentioned temperature-detecting device also includes：Current-limiting resistance RL,
Current-limiting resistance RL is arranged between first node J1 and sampling end, so that voltage signal meets that the voltage of control unit sampling end will
Ask.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of barbecue utensil, and it includes above-mentioned temperature
Spend detection means.Wherein, barbecue utensil can be electric oven.
The barbecue utensil of the embodiment of the present invention, can be within the scope of wider temperature by above-mentioned temperature-detecting device
Realization is precisely controlled to temperature, while can accurately detect whether temperature sensor occurs open circuit or short circuit, so as to user
Temperature sensor can be changed in time, prevent barbecue utensil to be damaged.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
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 at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is 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 invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (9)
- A kind of 1. temperature-detecting device, it is characterised in that including：Temperature sensor, one end ground connection of the temperature sensor；First bleeder circuit, one end of first bleeder circuit are connected with the other end of the temperature sensor, and described first The other end of bleeder circuit is connected with default power supply, one end of first bleeder circuit and the other end of the temperature sensor Between there is first node；Multiple second bleeder circuits, the first end of each second bleeder circuit in the multiple second bleeder circuit are mutually connected in one Be connected after rising with the first node, the second end of each second bleeder circuit be connected together after with the default power supply It is connected；Control unit, described control unit have sampling end and multiple control output ends, the sampling end and the first node It is connected, the multiple control output end is corresponding with the 3rd end of each second bleeder circuit to be connected, and described control unit is led to Cross the sampling end and sample the temperature value that the temperature sensor detects, and in the temperature for judging the temperature sensor and detecting Angle value controls the multiple second partial pressure when being less than preset voltage value more than the magnitude of voltage of preset temperature value and the first node At least one second bleeder circuit in circuit is operated.
- 2. temperature-detecting device according to claim 1, it is characterised in that first bleeder circuit includes：First divider resistance, one end of first divider resistance are connected with the other end of the temperature sensor, and described first The other end of divider resistance is connected with the default power supply.
- 3. temperature-detecting device according to claim 2, it is characterised in that the circuit knot of the multiple second bleeder circuit Structure is identical, and each second bleeder circuit in the multiple second bleeder circuit includes：First resistor, one end of the first resistor are connected with the first node；First switch pipe, the first end of the first switch pipe are connected with the other end of the first resistor, the first switch Second end of pipe is connected with the default power supply；Second resistance, one end of the second resistance are connected with the control terminal of the first switch pipe, the second resistance it is another One end is connected with corresponding control output end.
- 4. temperature-detecting device according to claim 3, it is characterised in that first in the multiple second bleeder circuit The resistance of resistance differs, and the resistance of respectively less than described first divider resistance.
- 5. temperature-detecting device according to claim 1, it is characterised in that also include：Current-limiting resistance, the current-limiting resistance are arranged between the first node and the sampling end.
- 6. according to the temperature-detecting device any one of claim 1-5, it is characterised in that the temperature sensor is heat Quick resistance.
- 7. temperature-detecting device according to claim 6, it is characterised in that the thermistor is also parallel with the first electricity Hold.
- 8. a kind of barbecue utensil, it is characterised in that including the temperature-detecting device according to any one of claim 1-7.
- 9. barbecue utensil according to claim 8, it is characterised in that the barbecue utensil is electric oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510866895.1A CN105371977B (en) | 2015-12-01 | 2015-12-01 | Temperature-detecting device and barbecue utensil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510866895.1A CN105371977B (en) | 2015-12-01 | 2015-12-01 | Temperature-detecting device and barbecue utensil |
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| CN105371977A CN105371977A (en) | 2016-03-02 |
| CN105371977B true CN105371977B (en) | 2018-03-06 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106959123B (en) * | 2017-04-24 | 2019-11-22 | 广东美的暖通设备有限公司 | The detection control method and device of sensor |
| CN110553747A (en) * | 2019-08-30 | 2019-12-10 | 华为技术有限公司 | device, method and system for detecting thermal runaway of electrical equipment |
| CN110969797A (en) * | 2019-11-14 | 2020-04-07 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fire alarm monitoring method and circuit |
| CN111664958A (en) * | 2020-05-29 | 2020-09-15 | 科大智能电气技术有限公司 | Wireless temperature measurement system and temperature measurement method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4236402B2 (en) * | 2001-10-09 | 2009-03-11 | 富士通マイクロエレクトロニクス株式会社 | Semiconductor device |
| JP2012247218A (en) * | 2011-05-25 | 2012-12-13 | Mitsumi Electric Co Ltd | Temperature measuring system |
| JP2013178118A (en) * | 2012-02-28 | 2013-09-09 | Honda Motor Co Ltd | Temperature detector |
| CN202836821U (en) * | 2012-08-01 | 2013-03-27 | 深圳市英威腾电气股份有限公司 | Circuit for temperature measurement |
| CN202814593U (en) * | 2012-08-13 | 2013-03-20 | 美的集团股份有限公司 | Temperature detecting device for ultra high temperature oven |
| CN203629713U (en) * | 2013-12-30 | 2014-06-04 | 广东瑞德智能科技股份有限公司 | Temperature acquisition circuit |
| CN104122005A (en) * | 2014-07-07 | 2014-10-29 | 惠州市亿能电子有限公司 | Temperature measurement device |
| CN205209650U (en) * | 2015-12-01 | 2016-05-04 | 广东美的厨房电器制造有限公司 | Temperature -detecting device and barbecue utensil |
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