Accurate temperature measuring equipment of a kind of electromagnetic oven and method
Technical field
The invention belongs to household appliance technical field, be specifically related to the thermometry of electromagnetic oven, accurate temperature measuring equipment of particularly a kind of electromagnetic oven and method.
Background technology
At present; The pan temperature detection of electromagnetic oven product mainly adopts the mode of thermistor to realize; A thermistor promptly is set under ceramic wafer; Through temperature sensing circuit thing to be detected is carried out temperature detection, see the curve C among Fig. 3, only can accurately test the temperature range a ' ' about 100 ℃-b ' '.The environment for use temperature of general household electrical appliance is-20 ℃~40 ℃, and a ' ' temperature can't accurately be tested the low-temperature heat stage far above-20 ℃.In the actual cooking operation, mainly comprise oil and the two kinds of patterns to boil water of boiling.60 ℃ of major control holding temperatures and boiling temperature are 100 ℃ when to boil water.This scheme still can satisfy user demand.But when boiling oil, the general oil temperature that requires is accurately controlled in 180 ℃~250 ℃ scopes, and this scheme then can't satisfy user demand, influences user's use greatly, and Product Safety is generally lower.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art and provide a kind of total temperature scope accurately to detect culinary art, and accurate temperature measuring equipment of electromagnetic oven and the scheme temperature controlled through control module.
The technical scheme that realizes the object of the invention is following: the accurate temperature measuring equipment of a kind of electromagnetic oven; The panel, coil panel, the circuit board that comprise electromagnetic oven; And be installed on the coil panel and be connected in the temperature measuring equipment of circuit board; It is characterized in that said temperature measuring equipment comprises the thermal insulation layer of at least two temperature sensors and bottom surface, the different temperature sensor in the temperature measuring equipment is connected to different temperature testing circuit on the circuit board.I.e. corresponding temperature sensing circuit of temperature sensor.
The foregoing circuit plate also includes single-chip microcomputer and power control module, and all temperature sensing circuits are connected with single-chip microcomputer in the circuit board, and said power control module also is connected on the single-chip microcomputer.
Further, the thermal insulation layer in the described temperature measuring equipment is soft heat-barrier material or mica sheet, can prevent that temperature measuring equipment and below circuit board from transmitting temperature, also can be used for the temperature measuring equipment supporting structure.
A kind of method that adopts the accurate temperature measuring equipment thermometric of above-mentioned electromagnetic oven is characterized in that, the single-chip microcomputer on the said circuit board receives and detect the temperature detection signal of each temperature sensing circuit output, and this signal is analyzed; Single-chip microcomputer simultaneously and the power control module communication, the status information of received power control module detects the heated condition of power control module, simultaneously according to the analysis result to temperature detection signal, the control power control module changes heated condition.
Further, the temperature detection signal of described temperature sensing circuit output is analog voltage or data signal.
The invention has the beneficial effects as follows: temperature measuring equipment adopts at least two temperature sensors, and its temperature and detection signal curve are seen curve A and the curve B among Fig. 3.The accurate thermometric temperature of curve A is in a~b scope, and the accurate thermometric temperature of curve B is in a '~b ' scope.Wherein b point temperature is more than or equal to the temperature of a ', and b ' some temperature is greater than 200 ℃, and a point temperature is less than 0 ℃.This scheme adopts at least two temperature sensing circuits that the different temperature section is accurately detected, and realizes the accurate detection of culinary art total temperature.Can realize treating the temperature of cooking thing accurately controls.
Description of drawings
Fig. 1 is the embodiment of the invention structure chart with two temperature sensors;
Fig. 2 is that the circuit with embodiment of the invention of two temperature sensors connects block diagram;
Fig. 3 is the temperature and the detection signal correlation curve figure of the prior art and the embodiment of the invention;
Fig. 4 is the embodiment of the invention circuit connection diagram with two temperature sensors.
The specific embodiment
As shown in Figure 1, the accurate temperature measuring equipment of a kind of electromagnetic oven comprises panel 1, coil panel 2, the circuit board 3 of electromagnetic oven, and is installed on the coil panel 2 and is connected in the temperature measuring equipment 4 of circuit board 3.Temperature measuring equipment 4 comprises the thermal insulation layer 43 of two temperature sensors 41,42 and bottom surface in the present embodiment; Temperature sensing circuit 31 on the temperature sensor 41 connecting circuit plates 3, temperature sensor 42 connects temperature sensing circuit 32.
As shown in Figure 2, said circuit board 3 also includes single-chip microcomputer 33 and power control module 34, and all temperature sensing circuits are connected with single-chip microcomputer 33 in the circuit board 3, and said power control module 34 also is connected on the single-chip microcomputer 33.
During work, single-chip microcomputer on the circuit board 3 33 receives and the temperature detection signal a and the temperature detection signal b of detected temperatures testing circuit 31 and temperature sensing circuit 32 outputs, and this two signal is analyzed.33 whiles and power control module 34 communications of single-chip microcomputer; The status information of received power control module 34; Heated condition to power control module 34 detects; According to the analysis result to temperature detection signal a and temperature detection signal b, control power control module 34 changes heated condition simultaneously, realizes accurately control.
The curve of actual temp detection signal is as shown in Figure 3, and curve C wherein is the temperature detection signal curve of prior art, only can accurately test the temperature range a ' ' about 100 ℃-b ' '.And the present invention adopts 31,32 pairs of different temperature sections of at least two temperature sensing circuits accurately to detect, and realizes the accurate detection of culinary art total temperature.When temperature was low, the thermometric curve was a curve A, can accurately test a-b scope; When temperature was higher, the thermometric curve was a curve B, can accurately test the temperature in a '~b ' scope.Obviously, the accurate temperature-measuring range of two temperature sensing circuits 31,32 is a-b ', and a point temperature is less than 0 ℃, and b ' some temperature is greater than 200 ℃.Therefore, both can accurately test, also can accurately test the heat stage to the low-temperature heat stage.Satisfy in the actual cooking operation, the temperature of boiling oil and two kinds of patterns to boil water is accurately tested, security of products is also higher.
As shown in Figure 4, the concrete connection of temperature sensing circuit is on the circuit board: the output of temperature sensing circuit 31 connects the input of single-chip microcomputer 33.In the temperature sensing circuit 31, temperature sensor 41 (R10) termination power Vcc, an end of an other terminating resistor R11, resistance R 12, capacitor C 10.Resistance R 11 1 termination temperature sensors 41 (R10), resistance R 12 and capacitor C 10, an other end ground connection GND.Resistance R 12 1 termination temperature sensors 41 (R10), resistance R 11, capacitor C 10, an other end connects the input port of single-chip microcomputer 33.One termination temperature sensor 41 (R10) of capacitor C 10, resistance R 11, resistance R 12, an other end ground connection GND.
The output of temperature sensing circuit 32 connects the input of single-chip microcomputer 33.In the temperature sensing circuit 32, temperature sensor 42 (R20) termination power Vcc, an end of an other terminating resistor R21, resistance R 22, capacitor C 20.Resistance R 21 1 termination temperature sensors 42 (R20), resistance R 22 and capacitor C 20, an other end ground connection GND.Resistance R 22 1 termination temperature sensors 42 (R20), resistance R 21, capacitor C 20, an other end connects the input port of single-chip microcomputer 33.One termination temperature sensor 42 (R20) of capacitor C 20, resistance R 21, resistance R 22, an other end ground connection GND.
Single-chip microcomputer 33 connects power control module 34 through PORT COM.Single-chip microcomputer 33 receives and the analog voltage of detected temperatures testing circuit 31 and temperature detection 32 outputs, and this magnitude of voltage is analyzed.33 whiles and power control module 34 communications of single-chip microcomputer; The status information of received power control module 34 detects the heated condition of power control module 34, simultaneously according to the analysis result to analog voltage; Control power control module 34 changes heated condition, realizes accurately control.