CN102235700A - Heating device, residual temperature display method of heating device, and residual temperature display control circuit - Google Patents

Abstract

The invention discloses a heating device, a residual temperature display method of the heating device and a residual temperature display control circuit. Wherein the heating unit, the temperature detection unit and the micro control unit are arranged in the body, and the body is provided with a furnace surface display unit arranged on the body. The heating unit is used for heating a pot placed on the stove surface; the temperature detection unit detects the temperature of the furnace surface and outputs a temperature signal according to the detection result; the micro control unit judges whether the temperature of the furnace surface is greater than a preset temperature according to the temperature signal so as to control the display unit to display a prompt signal. The invention can display different prompt signals according to different residual temperatures, and provides the residual temperature of the furnace surface for the user to refer to so as to improve the use safety.

Description

Heating device, residual temperature display method of heating device, and residual temperature display control circuit

technical field

The invention relates to a heating device, in particular to a heating device capable of displaying residual temperature on a furnace surface.

Background technique

The common electric heating cooking stove is an induction cooker, which mainly uses AC power sources of different frequencies to generate an alternating magnetic field, and then generates an induced current on the pot due to the cutting of the magnetic force line, and the induced current will be caused by the electromagnetic loss inside the pot. And converted into heat energy, to achieve the purpose of induction heating.

Compared with the traditional gas stove, the electric heating cooking stove has the characteristics of fast heating rate, uniform temperature distribution, precise temperature control, high safety and no carbon monoxide emission.

Existing electromagnetic heating device as shown in Figure 1, electromagnetic heating device 1 comprises a body 11, a heating unit 13, an operating unit 15 and a display unit 17, wherein a side of the body 11 has a furnace surface 111, the heating unit 13 Set in the body 11 and corresponding to the position of the furnace surface 111, the electromagnetic heating device 1 controls the heating unit 13 according to the operation instructions received by the operation unit 15 to perform heating or constant temperature modes, so that the pot placed on the furnace surface 111 A utensil (not shown in the figure) can heat the food to be cooked in the pot.

However, the display unit 17 of the existing electromagnetic heating device 1 usually only displays the temperature during heating. When the user removes the pan from the furnace surface 111 or closes the electromagnetic heating device 1, the electromagnetic heating device 1 stops heating, but The temperature of the furnace surface 111 is not continuously displayed, so there is no temperature warning function. Therefore, the user cannot know the remaining temperature of the heated oven surface 111 , and it is easy to cause burns due to inadvertently touching the oven surface 111 .

Contents of the invention

In view of the above problems, the technical problem to be solved by the present invention is to provide a prompt signal that can display the temperature of the furnace surface, so as to solve the problem that the existing heating device does not remind the user to pay attention to the residual temperature on the furnace surface after the heating device stops heating. defects, to achieve the effect of warning and safety.

The object of the present invention is to provide a heating device, which not only provides the user with heating the food to be cooked, but also reminds the user that the residual temperature remaining on the heated oven surface is overheated.

In order to solve the above technical problems, a technical solution of the present invention provides a heating device, which includes a body, a heating unit, a temperature detection unit, a display unit and a micro control unit. Wherein the heating unit, the temperature detection unit and the micro control unit are arranged in the main body, the main body has a furnace surface, and the display unit is arranged on the main body. The heating unit is used to heat the pot placed on the furnace surface; the temperature detection unit detects the temperature of the furnace surface, and outputs a temperature signal according to the detection result; the micro-control unit judges whether the temperature of the furnace surface is greater than a preset temperature according to the temperature signal, A prompt signal is displayed by controlling the display unit.

In order to solve the above technical problems, another technical solution of the present invention provides a method for displaying residual temperature of a heating device, which includes starting a heating unit; judging whether there is a pot on a stove; Turn off the heating unit and start a temperature detection unit; determine whether the temperature of the furnace surface exceeds a preset temperature; if the temperature of the furnace surface exceeds the preset temperature, adjust a display unit located on the furnace surface to display a prompt corresponding to the temperature Signal.

In order to solve the above technical problems, another technical solution of the present invention provides a residual temperature display control circuit, which is suitable for a heating device. The residual temperature display control circuit includes a temperature detection unit, a display unit and a micro control unit, wherein the temperature The detection unit detects the temperature of a furnace surface of the heating device, and outputs a temperature signal according to the detection result; the micro-control unit is coupled with the temperature detection unit and the display unit, and the micro-control unit judges whether the temperature signal is greater than a preset temperature to control the display The unit displays an alert signal.

The beneficial effect of the present invention is that, through the aforementioned technical solution, the present invention can display different prompt signals according to different residual temperatures, and provide users with reference to the remaining temperature on the furnace surface, so as to improve the safety of use.

Both the above summary and the following detailed description are exemplary, and are intended to further illustrate the protection scope of the present invention. Other objectives and advantages of the present invention will be further understood through the following description and the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

Description of drawings

Fig. 1 is the schematic diagram of an embodiment of existing electromagnetic heating device;

Fig. 2 is the schematic diagram of an embodiment of the heating device of the present invention;

Fig. 3 is a block diagram of an embodiment of the residual temperature display control circuit of the present invention; and

FIG. 4 is a flow chart of an embodiment of the residual temperature display method of the heating device of the present invention.

Wherein, the reference signs are explained as follows:

1 electromagnetic heating device

11 body

111 oven top

13 heating unit

15 operating units

17 display unit

2 heating device

2a residual temperature display control circuit

21 body

210 top plate

211 oven surface

20 MCU

22 power circuit

23 heating units

24 temperature detection unit

25 operating units

26 pot detection unit

27 first display unit

271 seven-segment display

273 light indicator

28 cooling units

29 second display unit

291, 295 light-emitting areas

293, 297 shading area

231 first temperature detection unit

24' second temperature detection unit

T ₁ first temperature signal

T ₂ second temperature signal

C ₁ command signal

D ₁ detection signal

S401～S419 Steps of the residual temperature display method of the heating device

Detailed ways

Please refer to FIG. 2 , which is a schematic diagram of an embodiment of a heating device provided by the present invention. As shown in FIG. 2 , the heating device 2 includes a body 21 , and a top plate 210 of the body 21 has a furnace surface 211 . The heating device 2 also includes a heating unit 23, a temperature detection unit 24, an operating unit 25, a first display unit 27, and a second display unit 29, wherein the heating unit 23 and the temperature detection unit 24 are arranged in the body 21; the first display unit 27 is disposed on the body 21 ; the second display unit 29 is disposed around or adjacent to the furnace surface 211 . In actual implementation, the heating device 2 may have two groups of the same above-mentioned elements, which work independently.

Wherein the heating unit 23 is used to heat the pan (not shown) placed on the furnace surface 211, the heating unit 23 can be an induction coil, by receiving an alternating current to generate a magnetic field, so that the pan on the furnace surface 211 To generate an induced electric field, the heating unit 23 can also be other heating sources such as heating resistors. The heating unit 23 can be a ring or a square coil, and the shape of the heating unit 23 corresponds to the shape of the furnace surface 211 .

The temperature detection unit 24 is used to detect the temperature of the furnace surface 211 ; the temperature detection unit 24 can be a resistance temperature detector (RTD) or an infrared temperature detector. The temperature detection unit 24 can be arranged under the center of the furnace surface 211, and the detection range is about the same as the range of the furnace surface 211. Usually, the center of the furnace surface 211 is the hottest after heating, and the farther away from the center, the lower the temperature of the furnace surface 211. Therefore, the temperature detection unit 24 is arranged at the center of the furnace surface 211 to achieve a better detection effect.

The second display unit 29 is arranged around the furnace surface 211, and is used to display the prompt signal relevant to the temperature of the furnace surface 211; the second display unit 29 can be a cold cathode tube or an LED lamp tube, and the shape of the second display unit 29 And the size can match the shape and size of the heating unit 24, that is, match the heatable part on the stove surface 211, such as a ring or a square, which is used to remind the user of the area that may be hot on the stove surface 211. For example, the appearance of the second display unit 29 can be shown in FIG. The unit 29 may include one or more than one LED light-emitting elements, wherein the LED light-emitting elements can be arranged in one of the light-emitting areas 291, 295, and the LED light-emitting elements can be used to emit light sideways so that different positions in the second display unit 29 can emit light. The areas 291, 295 emit uniform light, and the light emitted by the second display unit 29 is flashing light, for example, flashing once every second, and the duration of each light emission is 0.5 seconds, and the brightness of the light changes with the temperature of the furnace surface 211 , usually the higher the temperature, the stronger the brightness, and vice versa, the lower the temperature, the weaker the brightness. As shown in Table 1. The brightness ratio is a ratio compared to the maximum brightness of the second display unit 29 .

Table 1

Furnace surface temperature T(℃) T<42 42≤T<45 45≤T<48 48≤T<50 T＞50 Brightness ratio 0 1/5 2/5 3/5 4/5

The operation unit 25 is provided for the user to operate and set the heating temperature of the heating unit 23, and can also be used to provide the user to set the heating time, so that the heating device 2 operates in the heating, constant temperature or timing heating mode.

The first display unit 27 may include one or a combination of two display units, a seven-segment display 271 and a light indicator (or indicator light) 273 . The seven-segment display 271 can display the temperature of the pot currently heated by the heating device 2; the light indicator 273 can display the operation mode of the heating device 2, such as timing, heating or constant temperature, etc., and the light indicator 273 can also be used during heating. When the internal components of the device 2 such as the heating unit 23 are overheated or the current overload occurs, a warning light signal is sent out.

The heating device 2 can also include a speaker unit (not shown in the figure), which emits an alarm sound when the heating device 2 is overloaded with current or overheated, reminding the user to adjust the set temperature or turn off the heating device 2 .

The heating device 2 also has an overheating protection function, that is, a heat dissipation mechanism is activated when the temperature is overheated.

In order to further illustrate the components contained inside the heating device 2 and their working principles, please refer to FIG. 3 , which is a block diagram of an embodiment of a residual temperature display control circuit provided by the present invention. As shown in Figure 3, the residual temperature display control circuit 2a includes a micro control unit 20, a power supply circuit 22, a heating unit 23, a first temperature detection unit 231, a second temperature detection unit 24', an operation unit 25, and a pan detection unit 26 , the first display unit 27 , the cooling unit 28 and the second display unit 29 . The remaining temperature display control circuit 2a is suitable for the heating device 2 with heating function, in which the micro control unit 20, the power circuit 22, the heating unit 23, the first temperature detection unit 231, the second temperature detection unit 24', and the pot detection unit 26 And the heat dissipation unit 28 is arranged in the body 21 of the heating device 2 . The power supply circuit 22, the heating unit 23, the first temperature detection unit 231, the second temperature detection unit 24', the operation unit 25, the pot detection unit 26, the first display unit 27, the cooling unit 28 and the second display unit 29 are respectively connected with The micro control unit 20 is coupled; the first temperature detection unit 231 is also coupled to the heating unit 23, and the heating device 2 may include at least one set of remaining temperature display control circuits 2a. The heating unit 23 may have an IGBT power switch (not shown in the figure).

The power supply circuit 22 is coupled with a power supply and converts an alternating current into a direct current to supply the power required for the above-mentioned units to work. The power supply circuit 22 may include a power short circuit and noise protection circuit, a voltage or current detection circuit and a rectification circuit. When the current is too large, the power supply circuit 22 outputs an overcurrent signal to the micro control unit 20, and the micro control unit 20 controls the first display unit 27 or the speaker unit (not shown in the figure) to issue a warning signal according to the overcurrent signal.

The operation unit 25 receives the command signal C ₁ input by the user. The command signal C ₁ includes timing, heating or constant temperature, etc., and the micro-control unit 20 controls the output power of the heating unit 23 according to the command signal C ₁ , wherein the power is proportional to the heating temperature. Correspondingly, the greater the power, the greater the firepower; the first temperature detection unit 231 is used to detect the operating temperature of the IGBT power switch in the heating unit 23, and outputs the first temperature signal _T1 to the micro-control unit 20, and the micro-control unit 20 according to The first temperature signal _T1 adjusts the output power of the heating unit 23 or turns on the heat dissipation unit 28 to protect the heating unit 23 or other elements from being burned.

For example, the changing magnetic field of the heating unit 23 causes the pot to generate an induced electric field, and the pot detection unit 26 detects the induced electromotive force generated by the electron flow of the pot to output a detection signal D ₁ , and the micro-control unit 20 according to the detection signal D ₁ To judge whether there is a pot on the stove top 211, when the micro-control unit 20 judges that there is no pot on the stove top 211, the micro-control unit 20 starts the second temperature detection unit 24'; the second temperature detection unit 24 'Detect the temperature of the furnace surface 211, and output a second temperature signal _T2 according to the detection result, and the micro-control unit 20 judges whether the temperature of the furnace surface 211 is greater than a preset temperature according to the second temperature signal _T2 , and the preset temperature can be built into the microcontroller unit 20 . The preset temperature can be a set of preset temperatures, and the micro-control unit 20 compares the second temperature signal _T2 with the preset temperature to determine the temperature of the furnace surface 211, and controls the second display according to the size of the second temperature signal _T2 The unit 29 displays a reminder signal, such as a light that flashes once every second, and the intensity of the light corresponds to the magnitude of the second temperature signal _T2 .

Please refer to FIG. 4 , which is a flowchart of an embodiment of a residual temperature display method of a heating device provided by the present invention. As shown in Figure 4, at first, micro-control unit 20 receives command signal C ₁ (S401) from operation unit 25, and command signal C ₁ can be timing, heating or constant temperature command signal, and micro-control unit 20 will according to command signal C ₁ The heating device 2 operates in different modes, and at the same time controls the first display unit 27 to display the heating temperature and heating time according to the operating mode selected by the user; no matter what mode the heating device 2 operates in, the micro-control unit 20 will first determine the temperature of the furnace. Whether there is a pot on the surface 211 (S403), the method of judging can be based on the detection signal _D1 sent by the pot detection unit 26 after detecting the induced electromotive force of the pot to judge whether there is a pot. In actual implementation, if the micro control unit 20. If it is determined within a preset time, for example, 60 seconds, that there is a pot, the microcontroller 20 activates the second display unit 29 (S405), and the second display unit 29 can be fully bright at this time. The preset time can be built in the MCU 20 .

Then, the microcontroller 20 starts the heating unit 23 (S407), and the second display unit 29 is used to prompt the user that the heating unit 23 is heating at present, and the microcontroller 20 can also start the heating unit 23 and the second display unit 29 at the same time; If the pan detection unit 26 fails to detect the pan within the preset time, the micro control unit 20 will operate the heating device 2 in a standby mode, that is, the heating unit 23 will not be activated.

When the heating device 2 operates in the heating mode, the micro-control unit 20 still regularly judges whether there is a pot on the furnace surface 211 (S409); Heating signal, that is, receiving the stop heating signal from the operation unit 25 (S411); if the micro-control unit 20 receives the stop heating signal or judges that the cooking surface 211 is not equipped with a cooking utensil for more than a preset time, then turn off the heating unit 23 and start the second temperature detection unit 24' (S413), the second temperature detection unit 24' outputs the second temperature signal T ₂ according to the temperature of the furnace surface 211; the micro-control unit 20 judges the furnace surface 211 according to the second temperature signal T ₂ whether the temperature exceeds the first preset temperature (S415); the micro-control unit 20 adjusts the second display unit 29 according to the temperature of the furnace surface 211 to display a corresponding prompt signal (S417); after the second display unit 29 displays the prompt signal, micro The control unit 20 will judge whether the temperature of the furnace surface 211 has cooled down again within a certain period of time, and the micro control unit 20 will not turn off the second display unit 29 until the second temperature signal T ₂ is lower than the first preset temperature.

The temperature process of the furnace surface 211 can be judged by comparing the second temperature signal _T2 with a set of preset temperatures, for example, if the second temperature signal _T2 is lower than the first preset temperature, then turn off the second display unit 29 (S419); if the second temperature signal T ₂ is higher than the first preset temperature, for example, 42 degrees. Then continue to compare the second temperature signal _T2 with the second preset temperature (S415), such as 50 degrees, if the second temperature signal _T2 is higher than the second preset temperature, then control the brightness of the second display unit 29 to compare 4/5 at full brightness (S417); if the second temperature signal _T2 is lower than the second preset temperature, then continue to compare the second temperature signal _T2 with the third preset temperature (S415), for example, 48 degrees , if it is higher than the third preset temperature, control the brightness of the second display unit 29 to 3/5 of full brightness (S417); Signal _T2 is compared with the fourth preset temperature (S415), the fourth preset temperature is lower than the third preset temperature, you can refer to Table 1, and the comparison is not stopped until the second temperature signal _T2 is lower than the first preset temperature And turn off the second display unit 29 (S419).

Based on the above, it can be seen that the heating device of the present invention uses the temperature detection unit to detect the temperature of the furnace surface, and displays flashing lights on the adjacent places of the furnace surface according to the temperature of the furnace surface, and the lights have a corresponding brightness ratio according to the temperature of the furnace surface. . In this way, the user can clearly judge whether there is residual temperature on the furnace surface, so as to prevent the user from accidentally touching the furnace surface with residual temperature and causing burns.

But the above-mentioned ones are only preferred embodiments of the present invention, and the protection scope of the implementation of the present invention cannot be limited with this, that is, all simple equivalent changes and modifications made according to the protection scope of the present invention and the content of the description of the invention, All still belong to the scope of protection covered by the present invention.

Claims (11)

1. a heater is characterized in that, this heater comprises:

One body has a boiler face;

One heating unit is arranged in this body, is placed on a pan on this boiler face in order to heating;

One temperature detecting unit is arranged in this body, and this temperature detecting unit detects the temperature of this boiler face, and exports a temperature signal according to testing result; And

One display unit is arranged on this body; And

One micro-control unit is arranged in this body, couples with this temperature detecting unit and this display unit respectively, and whether the temperature that this micro-control unit is judged this boiler face according to this temperature signal to control this display unit shows a cue greater than a preset temperature.

2. heater as claimed in claim 1, when it is characterized in that temperature when this boiler face is greater than this preset temperature, this cue that this display unit of this micro-control unit controls shows is bright lamp, and when the temperature of this boiler face during less than this preset temperature, this micro-control unit is closed this display unit.

3. heater as claimed in claim 2 is characterized in that this cue brightness of this display unit demonstration is corresponding with the temperature height of this boiler face, when this furnace surface temperature is high more, and the brighter display of this cue.

4. heater as claimed in claim 1 it is characterized in that the shape of this display unit is corresponding with the shape of this heating unit, and this display unit has a plurality of luminous zones and a plurality of shading region.

5. heater as claimed in claim 1 is characterized in that, this heating unit also comprises a pan detecting unit, and this pan detecting unit is arranged in this body, and this pan detecting unit detects this pan on this boiler face to export a detection signal.

6. heater as claimed in claim 5, it is characterized in that this micro-control unit and this pan detecting unit couple, this micro-control unit judges according to this detection signal whether this pan is placed on this boiler face, judge this pan on this boiler face from having to nothing when this micro-control unit, then this micro-control unit starts this temperature detecting unit.

7. the surplus temperature display packing of a heater is characterized in that, this surplus temperature display packing comprises step:

Start a heating unit;

Judge whether a boiler face is equipped with pan;

If this boiler face is not equipped with pan, then closes this heating unit and start a temperature detecting unit;

Whether the temperature of judging this boiler face surpasses one first preset temperature; And

If the temperature of this boiler face surpasses this first preset temperature, then adjust a display unit and show and the corresponding cue of temperature.

8. the surplus temperature display packing of heater as claimed in claim 7 is characterized in that, also comprises step: if the temperature of this boiler face is then closed this display unit and this temperature detecting unit less than this first preset temperature.

9. the surplus temperature display packing of heater as claimed in claim 7 is characterized in that, also comprises step: after this display unit shows this cue, judge once more whether the temperature of this boiler face surpasses this first preset temperature.

10. the surplus temperature display packing of heater as claimed in claim 7 is characterized in that, also comprises step: whether the temperature of judging this boiler face surpasses one second preset temperature.

11. a surplus temperature display control circuit is applicable to a heater, it is characterized in that this surplus temperature display control circuit comprises:

One temperature detecting unit detects the temperature of a boiler face of this heater, and exports a temperature signal according to testing result;

One display unit; And

One micro-control unit couples with this temperature detecting unit and this display unit, and whether this micro-control unit judges this temperature signal greater than a preset temperature, shows a cue to control this display unit.

Images