CN105371977A - Temperature detection device and barbecue device comprising the same - Google Patents
Temperature detection device and barbecue device comprising the same Download PDFInfo
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- CN105371977A CN105371977A CN201510866895.1A CN201510866895A CN105371977A CN 105371977 A CN105371977 A CN 105371977A CN 201510866895 A CN201510866895 A CN 201510866895A CN 105371977 A CN105371977 A CN 105371977A
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Abstract
The present invention discloses a temperature detection device and a barbecue device comprising the same. The temperature detection device comprises a temperature sensor; a first bleeder circuit, a first node being arranged between one end of the first bleeder circuit and the other end of the temperature sensor; a plurality of second bleeder circuits, first ends of the second bleeder circuits being connected to each other and then being connected with the first node, second ends of the second bleeder circuits being connected to each other and then being connect with a preset power supply; and a control unit, the sampling end of the control unit being connected with the first node, a plurality of control output ends of the control unit being correspondingly connected with the third ends of the second bleeder circuits, the control unit being configured to control the work of at least one second bleeder circuit in the plurality of second bleeder circuits when the control unit detects the temperature value detected by the temperature sensor is larger than a preset temperature value and the voltage value of the first node is smaller than a preset voltage value. The temperature detection device has high detection precision and wide temperature detection scope, and is able to accurately detect whether a temperature sensor has a short circuit or an open circuit or not.
Description
Technical field
The present invention relates to household electrical appliance technical field, particularly a kind of temperature-detecting device and a kind of barbecue utensil with this temperature-detecting device.
Background technology
In barbecue utensil (as electric oven), in order to control cavity temperature in setting range, need detect cavity temperature.
Usually, cavity temperature detection method be after the resistant series by temperature sensor and a fixed resistance value with power sources in parallel, then the contact of temperature sensor and resistance is connected to the input end of control chip.When the temperature varies, the resistance of temperature sensor will change thereupon, and the junction voltage of temperature sensor and resistance also changes thereupon, and therefore, control chip is undertaken by docking point voltage gathering and change the temperature that can obtain furnace chamber.But the accuracy of detection of this detection method is lower, and temperature detection range is narrow, and accurately whether cannot there is open circuit or short circuit by detected temperatures sensor.
Summary of the invention
The present invention is intended to solve one of technical matters in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose a kind of temperature-detecting device, and the accuracy of detection of this device is high and temperature detection range is wider, and accurately can detect whether temperature sensor open circuit or short circuit occur.
Another object of the present invention is to propose a kind of barbecue utensil.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of temperature-detecting device, comprising: temperature sensor, one end ground connection of described temperature sensor; First bleeder circuit, one end of described first bleeder circuit is connected with the other end of described temperature sensor, the other end of described first bleeder circuit is connected with default power supply, has first node between one end of described first bleeder circuit and the other end of described temperature sensor; Multiple second bleeder circuit, is connected with described first node after the first end of each second bleeder circuit in described multiple second bleeder circuit is connected together, and is connected after the second end of described each second bleeder circuit is connected together with described default power supply; Control module, described control module has sampling end and multiple control output end, described sampling end is connected with described first node, described multiple control output end is corresponding with the 3rd end of described each second bleeder circuit to be connected, described control module to be sampled the temperature value that described temperature sensor detects by described sampling end, and at least one second bleeder circuit controlled in described multiple second bleeder circuit carries out work when judging that temperature value that described temperature sensor detects is greater than preset temperature value and the magnitude of voltage of described first node is less than preset voltage value.
According to the temperature-detecting device of the embodiment of the present invention, when the temperature value that temperature sensor detects is greater than preset temperature value and the magnitude of voltage of first node is less than preset voltage value, work is carried out by least one second bleeder circuit controlled in multiple second bleeder circuit, keep in the reasonable scope to make the magnitude of voltage at first node place, thus ensure the precision of temperature detection, and there is wider temperature detection range, accurately can detect whether temperature sensor open circuit or short circuit occur simultaneously.
According to one embodiment of present invention, described first bleeder circuit comprises: the first divider resistance, and one end of described first divider resistance is connected with the other end of described temperature sensor, and the other end of described first divider resistance is connected with described default power supply.
Further, the circuit structure of described multiple second bleeder circuit is identical, and each second bleeder circuit in described multiple second bleeder circuit comprises: the first resistance, and one end of described first resistance is connected with described first node; First switching tube, the first end of described first switching tube is connected with the other end of described first resistance, and the second end of described first switching tube is connected with described default power supply; Second resistance, one end of described second resistance is connected with the control end of described first switching tube, and the other end of described second resistance is connected with corresponding control output end.
Further, the resistance of the first resistance in described multiple second bleeder circuit is all not identical, and is all less than the resistance of described first divider resistance.
According to one embodiment of present invention, described temperature-detecting device, also comprises: current-limiting resistance, and described current-limiting resistance is arranged between described first node and described sampling end.
According to one embodiment of present invention, described temperature sensor is thermistor.
Further, described thermistor is also parallel with the first electric capacity.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of barbecue utensil, and it comprises above-mentioned temperature-detecting device.
The barbecue utensil of the embodiment of the present invention, by above-mentioned temperature-detecting device, the accurate control to temperature can be realized in wider temperature range, accurately can detect whether temperature sensor open circuit or short circuit occur simultaneously, so that user can change temperature sensor in time, barbecue utensil is prevented to be damaged.
According to one embodiment of present invention, described barbecue utensil is electric oven.
Accompanying drawing explanation
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
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Fig. 1 is the block diagram of temperature-detecting device according to an embodiment of the invention.As shown in Figure 1, this temperature-detecting device comprises: temperature sensor 10, first bleeder circuit 20, multiple second bleeder circuit and control module 40.
Wherein, one end ground connection GND of temperature sensor 10, one end of first bleeder circuit 20 is connected with the other end of temperature sensor 10, the other end of the first bleeder circuit 20 is connected with default power supply VCC, has first node J1 between one end of the first bleeder circuit 20 and the other end of temperature sensor 10.Be connected with first node J1 after the first end of each second bleeder circuit in multiple second bleeder circuit is connected together, be connected with default power supply VCC after the second end of each second bleeder circuit is connected together.Control module 40 has sampling end and multiple control output end, sampling end is connected with first node J1, multiple control output end is corresponding with the 3rd end of each second bleeder circuit to be connected, the temperature value that control module 40 is detected by sampling end samples temperature sensor 10, and at least one second bleeder circuit controlled in multiple second bleeder circuit carries out work when judging that temperature value that temperature sensor 10 detects is greater than preset temperature value and the magnitude of voltage of first node J1 is 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.Such as, preset voltage value can be [1/4*U, 3/4*U], and preferably, preset voltage value is 1/2*U, and wherein, U is the voltage of default power supply VCC.
Particularly, as shown in Figure 1, two the second bleeder circuits in temperature-detecting device, can be comprised, be respectively the second bleeder circuit 31 and the second bleeder circuit 32.After temperature-detecting device works on power, first bleeder circuit 20 is started working, control module 40 is by the voltage signal of sampling end real-time sampling first node J1, and analog to digital conversion is carried out to obtain the magnitude of voltage of first node J1 to the voltage signal of first node J1, then control module 40 obtains the temperature value that detects of temperature sensor 10 according to the relation between magnitude of voltage and temperature value.
When the temperature varies, the resistance of temperature sensor 10 will change thereupon, and according to voltage divider principle, the magnitude of voltage at first node J1 place also changes thereupon.Such as, when temperature sensor 10 is negative temperature coefficient temperature sensor, if temperature is very low, then the resistance of temperature sensor 10 is very large, and the magnitude of voltage of first node J1 is higher; If temperature is very high, then the resistance of temperature sensor 10 is very little, and the magnitude of voltage of first node J1 is lower.In order to improve the precision of temperature detection, in an embodiment of the present invention, by controlling multiple second bleeder circuit, to ensure that the magnitude of voltage of first node is in rational scope, thus ensure the precision of temperature detection.
Specifically, the temperature value detected when temperature sensor 10 is very low, and the magnitude of voltage of first node J1 higher time, such as the magnitude of voltage of first node J1 is at [1/4*U, 3/4*U] between, represent that the resolution of control module 40 is relatively good, namely the precision comparison of temperature detection is high, now without the need to controlling the second bleeder circuit 31 and the second bleeder circuit 32 carries out work.
The temperature value detected when temperature sensor 10 is higher, and the magnitude of voltage of first node J1 lower time, such as, when the magnitude of voltage of first node J1 is less than 1/4*U, represent that the resolution of control module 40 is lower, namely the precision comparison of temperature detection is low, now needs control second bleeder circuit 31 or the second bleeder circuit 32 to carry out work, is increased to [1/4*U to make the magnitude of voltage of first node J1,3/4*U], thus ensure the accuracy of detection of temperature.
The temperature value detected when temperature sensor 10 is very high, and the magnitude of voltage at first node J1 place lower time, such as, when the magnitude of voltage of first node J1 is less than 1/4*U, represent that the resolution of control module 40 is very low, namely the precision of temperature detection is very low, now needs control second bleeder circuit 31 and the second bleeder circuit 32 all to carry out work, is increased to [1/4*U to make the magnitude of voltage of first node J1,3/4*U], thus ensure the accuracy of detection of temperature.
Be understandable that, in temperature detection process, if temperature sensor is opened a way, then the magnitude of voltage of first node will reach default supply voltage; If temperature sensor is short-circuited, then the magnitude of voltage of first node is zero.And under normal circumstances, by the sampling of the magnitude of voltage to first node, the magnitude of voltage at first node place, between [1/4*U, 3/4*U], therefore, accurately can detect whether temperature sensor open circuit or short circuit occur.
The temperature-detecting device of the embodiment of the present invention, when the temperature value that temperature sensor detects is greater than preset temperature value and the magnitude of voltage of first node is less than preset voltage value, work is carried out by least one second bleeder circuit controlled in multiple second bleeder circuit, keep in the reasonable scope to make the magnitude of voltage at first node place, thus ensure the precision of temperature detection, and there is wider temperature detection range, accurately can detect whether temperature sensor open circuit or short circuit occur simultaneously.
According to one embodiment of present invention, as shown in Figure 2, the first bleeder circuit 20 comprises the first divider resistance RF1, and one end of the first divider resistance RF1 is connected with the other end of temperature sensor 10, and the other end of the first divider resistance RF1 is connected with default power supply VCC.
The circuit structure of multiple second bleeder circuit is identical, each second bleeder circuit in multiple second bleeder circuit comprises: the first resistance, the first switching tube and the second resistance, one end of first resistance is connected with first node J1, the first end of the first switching tube is connected with the other end of the first resistance, second end of the first switching tube is connected with default power supply VCC, one end of second resistance is connected with the control end of the first switching tube, and the other end of the second resistance is connected with corresponding control output end.Wherein, the resistance of the first resistance in multiple second bleeder circuit is all not identical, and is all less than the resistance of the first divider resistance RF1.Such as, in resistance > second bleeder circuit 31 of the first divider resistance RF1 the first resistance R1 resistance > second bleeder circuit 32 in the resistance of the first resistance R3.
Temperature sensor 10 can be that thermistor NTC, thermistor NTC are also parallel with the first electric capacity C1.
Particularly, temperature-detecting device can be arranged in electric oven to detect cavity temperature.After electric oven works on power, when cavity temperature is very low, the resistance of thermistor NTC is very large, control module 40 controls the first control output end R05 and the second control output end R06 and exports high level, to make the first triode Q1 in the second bleeder circuit 31 and the first triode Q2 in the second bleeder circuit 32 turn off, the first divider resistance RF1 is now only had to connect with thermistor NTC.Because the resistance value ratio of the first divider resistance RF1 is comparatively large, therefore the magnitude of voltage of first node J1 is greater than 1/2*U, and now the resolution of control module 40 is relatively good.When cavity temperature changes, the resistance of thermistor NTC will change thereupon, because the resistance of the first divider resistance RF1 immobilizes, therefore the change in resistance with thermistor NTC changes by the magnitude of voltage of first node J1, control module 40 by the voltage signal of sampling first node J1, and is changed to obtain different temperature values to it.
Along with the continuous rising of cavity temperature, the resistance of thermistor NTC reduces gradually, when the magnitude of voltage of first node J1 is less than 1/2*U, control module 40 controls the first control output end R05 output low level, to make the first triode Q1 conducting in the second bleeder circuit 31, control the second control output end R06 simultaneously and export high level, turn off to make the first triode Q2 in the second bleeder circuit 32, now, the first divider resistance RF1 connects with thermistor NTC with after the first resistance R1 parallel connection in the second bleeder circuit 31.Because in the second bleeder circuit 31, the resistance of the first resistance R1 is less than the resistance of the first divider resistance RF1, therefore the magnitude of voltage of first node J1 will be greater than 1/2*U.Because in the first divider resistance RF1 and the second bleeder circuit 31, the resistance of the first resistance R1 all immobilizes, therefore, change in resistance with thermistor NTC changes by the magnitude of voltage of first node J1, control module 40 by the voltage signal of sampling first node J1, and is changed to obtain different temperature values to it.
Along with cavity temperature continues to rise, continuation reduces by the resistance of thermistor NTC, when the magnitude of voltage of first node J1 is less than 1/2*U again, control module 40 controls the first control output end R05 and the equal output low level of the second control output end R06, to make the first triode Q1 in the second bleeder circuit 31 and the equal conducting of the first triode Q2 in the second bleeder circuit 32, connect with thermistor NTC after the first resistance R1 now in the first divider resistance RF1, the second bleeder circuit 31 and the first resistance R3 parallel connection in the second bleeder circuit 32.Due to the resistance of the first resistance R3 in resistance > second bleeder circuit 32 of the first resistance R1 in resistance > second bleeder circuit 31 of the first divider resistance RF1, therefore the magnitude of voltage of first node J1 will be greater than 1/2*U.Because in the resistance of the first resistance R1 in the first divider resistance RF1, the second bleeder circuit 31 and the second bleeder circuit 32, the resistance of the first resistance R3 all immobilizes, therefore, change in resistance with thermistor NTC changes by the magnitude of voltage of first node J1, control module 40 by the voltage signal of sampling first node J1, and is changed to obtain different temperature values to it.
Control module 40 needs on/off relay by accurately detecting cavity temperature to judge whether, precisely to control cavity temperature.
In this embodiment, because the magnitude of voltage of first node is all the time close to 1/2*U, this makes control module have optimum resolution all the time, thus improves the precision of temperature detection, accurately whether open circuit or short circuit can occur detected temperatures sensor simultaneously.And, connect with temperature sensor again after using multiple resistor coupled in parallel, therefore can measure the temperature of relative broad range.
According to one embodiment of present invention, as shown in Figure 2, above-mentioned temperature-detecting device also comprises: current-limiting resistance RL, and current-limiting resistance RL is arranged between first node J1 and sampling end, with the voltage request making voltage signal meet control module sampling end.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of barbecue utensil, and it comprises above-mentioned temperature-detecting device.Wherein, barbecue utensil can be electric oven.
The barbecue utensil of the embodiment of the present invention, by above-mentioned temperature-detecting device, the accurate control to temperature can be realized in wider temperature range, accurately can detect whether temperature sensor open circuit or short circuit occur simultaneously, so that user can change temperature sensor in time, barbecue utensil is prevented to be damaged.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but 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 ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this instructions or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (9)
1. a temperature-detecting device, is characterized in that, comprising:
Temperature sensor, one end ground connection of described temperature sensor;
First bleeder circuit, one end of described first bleeder circuit is connected with the other end of described temperature sensor, the other end of described first bleeder circuit is connected with default power supply, has first node between one end of described first bleeder circuit and the other end of described temperature sensor;
Multiple second bleeder circuit, is connected with described first node after the first end of each second bleeder circuit in described multiple second bleeder circuit is connected together, and is connected after the second end of described each second bleeder circuit is connected together with described default power supply;
Control module, described control module has sampling end and multiple control output end, described sampling end is connected with described first node, described multiple control output end is corresponding with the 3rd end of described each second bleeder circuit to be connected, described control module to be sampled the temperature value that described temperature sensor detects by described sampling end, and at least one second bleeder circuit controlled in described multiple second bleeder circuit carries out work when judging that temperature value that described temperature sensor detects is greater than preset temperature value and the magnitude of voltage of described first node is less than preset voltage value.
2. temperature-detecting device according to claim 1, is characterized in that, described first bleeder circuit comprises:
First divider resistance, one end of described first divider resistance is connected with the other end of described temperature sensor, and the other end of described first divider resistance is connected with described default power supply.
3. temperature-detecting device according to claim 2, is characterized in that, the circuit structure of described multiple second bleeder circuit is identical, and each second bleeder circuit in described multiple second bleeder circuit comprises:
First resistance, one end of described first resistance is connected with described first node;
First switching tube, the first end of described first switching tube is connected with the other end of described first resistance, and the second end of described first switching tube is connected with described default power supply;
Second resistance, one end of described second resistance is connected with the control end of described first switching tube, and the other end of described second resistance is connected with corresponding control output end.
4. temperature-detecting device according to claim 3, is characterized in that, the resistance of the first resistance in described multiple second bleeder circuit is all not identical, and is all less than the resistance of described first divider resistance.
5. temperature-detecting device according to claim 1, is characterized in that, also comprises:
Current-limiting resistance, described current-limiting resistance is arranged between described first node and described sampling end.
6. the temperature-detecting device according to any one of claim 1-5, is characterized in that, described temperature sensor is thermistor.
7. temperature-detecting device according to claim 6, is characterized in that, described thermistor is also parallel with the first electric capacity.
8. a barbecue utensil, is characterized in that, comprises the temperature-detecting device according to any one of claim 1-7.
9. barbecue utensil according to claim 8, is characterized in that, described barbecue utensil is electric oven.
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| CN201510866895.1A CN105371977B (en) | 2015-12-01 | 2015-12-01 | Temperature-detecting device and barbecue utensil |
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| CN201510866895.1A CN105371977B (en) | 2015-12-01 | 2015-12-01 | Temperature-detecting device and barbecue utensil |
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| CN105371977A true CN105371977A (en) | 2016-03-02 |
| CN105371977B CN105371977B (en) | 2018-03-06 |
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| WO2021036308A1 (en) * | 2019-08-30 | 2021-03-04 | 华为技术有限公司 | Apparatus, method, and system for detecting thermal runaway in electrical device |
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| CN105371977B (en) | 2018-03-06 |
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