Heating device and electronic equipment

Abstract

The utility model discloses a heating device and electronic equipment. The heating device comprises a heating assembly and a control circuit. The heating assembly comprises a thick film heating part and a pipeline, and the thick film heating part is arranged on the pipeline. The control circuit comprises a controller, a switch branch, a first temperature detection branch and a second temperature detection branch. And the controller outputs a heating signal. And the switch branch is switched on in response to the heating signal so as to form a loop in which the alternating current power supply supplies power to the thick film heating part. The first temperature detection branch is used for outputting a first detection signal based on the temperature of the thick film heating part. The second temperature detection branch is used for outputting a second detection signal based on the temperature of the liquid at the outlet of the pipeline. The controller further adjusts the duration of outputting the heating signal in a control period according to the first detection signal and the second detection signal, and the control period comprises the duration of outputting the heating signal and the duration of not outputting the heating signal. In this way, the accuracy of the heating temperature can be improved while rapid heating of liquid is achieved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of liquid heating, and particularly relate to a heating device and electronic equipment. BACKGROUND

[0002] In some electronic equipment, such as coffee machines, a heating device for heating liquid (such as water) is usually arranged inside. At present, for a coffee machine, the heating device inside is usually formed integrally by casting aluminum and a heating tube. However, such a heating device has a slow temperature rise during heating, a long preheating time, high energy consumption, and poor accuracy of heating temperature. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a heating device and electronic equipment, which can achieve rapid heating of liquid while improving the accuracy of heating temperature.

[0004] In a first aspect, an embodiment of the present application provides a heating device, comprising: a heating assembly, comprising a thick-film heating portion and a pipeline, the thick-film heating portion being arranged in the pipeline, the pipeline being used for flowing liquid; a control circuit, electrically connected with the thick-film heating portion, used for controlling a heating process of the heating assembly, comprising a controller, a switching branch, a first temperature detection branch, and a second temperature detection branch; the controller is used for outputting a heating signal; the switching branch is electrically connected with the controller, the switching branch and the thick-film heating portion are connected in series between a first end and a second end of an alternating current power supply, the switching branch is used for conducting in response to the heating signal, to form a loop in which the alternating current power supply supplies power to the thick-film heating portion; the first temperature detection branch is arranged in the thick-film heating portion, the first temperature detection branch is electrically connected with the controller, the first temperature detection branch is used for outputting a first detection signal to the controller based on the temperature of the thick-film heating portion; the second temperature detection branch is arranged at an outlet of the pipeline through which the liquid flows out, the second temperature detection branch is electrically connected with the controller, the second temperature detection branch is used for outputting a second detection signal to the controller based on the temperature of the liquid at the outlet of the pipeline; the controller is further used for adjusting the length of time for outputting the heating signal in a control period according to the first detection signal and the second detection signal, wherein the control period comprises the length of time for outputting the heating signal and the length of time for not outputting the heating signal.

[0005] In one or more embodiments, the switching branch comprises: a current amplification unit, electrically connected with the controller, used for outputting amplified current corresponding to the heating signal; a switching unit, connected with the current amplification unit and connected in series with the thick-film heating portion between the first end and the second end of the alternating current power supply, used for conducting in response to the current output by the current amplification unit, to form the loop in which the alternating current power supply supplies power to the thick-film heating portion.

[0006] In one or more embodiments, the current amplification unit comprises a first resistor, a second resistor and a first switch tube; the first resistor and the second resistor are connected in series between the controller and the ground, a connection point between the first resistor and the second resistor is connected to a first end of the first switch tube, a second end of the first switch tube is grounded, and a third end of the first switch tube is connected to the switch unit.

[0007] In one or more embodiments, the first switch tube is an NPN triode; the first end of the first switch tube is the gate of the NPN triode, the second end of the first switch tube is the emitter of the NPN triode, and the third end of the first switch tube is the collector of the NPN triode.

[0008] In one or more embodiments, the switch unit comprises a third resistor, a fourth resistor, a first capacitor and a thyristor; the third resistor and the fourth resistor are connected in series between the current amplification unit and the second end of the AC power supply, a connection point between the third resistor and the fourth resistor is connected to the control end of the thyristor, the first capacitor is connected in parallel with the fourth resistor, the first end of the non-control end of the thyristor is connected to the first end of the AC power supply through the thick-film heating part, and the second end of the non-control end of the thyristor is connected to the second end of the AC power supply.

[0009] In one or more embodiments, the first temperature detection branch comprises a first thermistor, a fifth resistor, a sixth resistor and a second capacitor; the fifth resistor and the first thermistor are connected in series between the first power supply and the ground, a connection point between the fifth resistor and the first thermistor is sequentially connected to the ground through the sixth resistor and the second capacitor, and a connection point between the sixth resistor and the second capacitor is connected to the controller.

[0010] In one or more embodiments, the second temperature detection branch comprises a second thermistor, a seventh resistor, an eighth resistor and a third capacitor; the seventh resistor and the second thermistor are connected in series between the first power supply and the ground, a connection point between the seventh resistor and the second thermistor is sequentially connected to the ground through the eighth resistor and the third capacitor, and a connection point between the eighth resistor and the third capacitor is connected to the controller.

[0011] In a second aspect, the embodiments of the present application provide an electronic device comprising the heating device as described above.

[0012] In one or more embodiments, the electronic device is a coffee machine

[0013] The application has the beneficial effects that: the heating device provided by the application includes a heating assembly and a control circuit. The heating assembly includes a thick film heating part and a pipeline, the thick film heating part is arranged in the pipeline, and the pipeline is used for flowing liquid. The control circuit is electrically connected with the thick film heating part, and the control circuit is used for controlling the heating process of the heating assembly. The control circuit includes a controller, a switch branch, a first temperature detection branch and a second temperature detection branch. The controller is used for outputting a heating signal. The switch branch is electrically connected with the controller, and the switch branch is connected in series between a first end and a second end of an alternating current power supply, and the switch branch is used for conducting in response to the heating signal to form a loop in which the alternating current power supply supplies power to the thick film heating part. The first temperature detection branch is arranged in the thick film heating part, the first temperature detection branch is electrically connected with the controller, and the first temperature detection branch is used for outputting a first detection signal to the controller based on the temperature of the thick film heating part. The second temperature detection branch is arranged at an outlet of the pipeline through which the liquid flows out, the second temperature detection branch is electrically connected with the controller, and the second temperature detection branch is used for outputting a second detection signal to the controller based on the temperature of the liquid at the outlet of the pipeline. The controller is further used for adjusting the length of time for outputting the heating signal in a control period according to the first detection signal and the second detection signal, wherein the control period includes the length of time for outputting the heating signal and the length of time for not outputting the heating signal. Through the above process, on the one hand, the thick film heating part is used for heating, and the switch branch is completely turned on to heat by the maximum power, so that the liquid can be quickly heated. On the other hand, the two temperature detection branches are combined to detect the temperatures at different positions, which is beneficial to improve the accuracy of the heating temperature. BRIEF DESCRIPTION OF DRAWINGS

[0014] One or more embodiments are illustrated by way of example in the figures that are part of this document and which illustrate key / representative principles of the application. The same reference numbers in different drawings represent the same components or the similar components.

[0015] Figure 1 is a schematic diagram of a heating device provided by an embodiment of the application Figure 1 ;

[0016] Figure 2 is a schematic diagram of a heating device provided by an embodiment of the application Figure 2 ;

[0017] Figure 3 is a schematic diagram of a circuit structure in a heating device provided by an embodiment of the application. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for clear and detailed description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain and not limit the present application.

[0019] It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements can exist between them.

[0020] In addition, the technical features involved in each of the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0021] Please refer to Figure 1 , Figure 1 The schematic diagram of the heating device provided by the embodiments of the present application is shown in the figure. The heating device 100 includes a heating assembly 10 and a control circuit 20.

[0022] The heating assembly 10 includes a thick film heating part 11 and a pipe 12. The thick film heating part 11 is arranged in the pipe 12, and the pipe 12 is used for flowing liquid. The thick film heating part 11 is an element manufactured by thick film technology. In some embodiments, the thick film heating part 11 realizes the heating function by printing a layer of special resistive material on a substrate (metal or ceramic). In some embodiments, the pipe 12 is a ring-shaped stainless steel pipe. By printing the thick film heating part 11 on the ring-shaped stainless steel pipe, the liquid inside the stainless steel pipe can be quickly heated. In some embodiments, the liquid includes water.

[0023] The control circuit 20 is electrically connected with the thick film heating part 11, and the control circuit 20 is used for controlling the heating process of the heating assembly 10. The control circuit 20 includes a controller 21, a switch branch 22, a first temperature detection branch 23 and a second temperature detection branch 24.

[0024] The switch branch 22 is electrically connected with the controller 21, and the switch branch 22 and the thick film heating part 11 are connected in series between the first end and the second end of the alternating current power supply 200. The first temperature detection branch 23 is arranged in the thick film heating part 11, and the first temperature detection branch 23 is electrically connected with the controller 21. The second temperature detection branch 23 is arranged at the outlet of the pipe 12 flowing out the liquid, and the second temperature detection branch 23 is electrically connected with the controller 21.

[0025] Specifically, the controller 21 is configured to output a heating signal. The switch branch 22 is configured to be turned on in response to the heating signal to form a loop for the AC power supply 200 to supply power to the thick film heating portion 11 (i.e. the AC power supply 200, the thick film heating portion 11 and the switch unit 222 form a loop, the thick film heating portion 11 is powered to generate heat, and the liquid inside the pipe 12 can be heated). The first temperature detection branch 23 is configured to output a first detection signal to the controller 21 based on the temperature of the thick film heating portion 11. The second temperature detection branch 23 is configured to output a second detection signal to the controller 21 based on the temperature of the liquid at the outlet of the pipe 12. The controller 21 is further configured to adjust the length of time for outputting the heating signal in a control period according to the first detection signal and the second detection signal, wherein the control period includes the length of time for outputting the heating signal and the length of time for not outputting the heating signal. It can be understood that, on the basis that the total length of the control period remains unchanged, the longer the length of time for outputting the heating signal, the higher the final temperature of the liquid; conversely, the shorter the length of time for outputting the heating signal, the lower the final temperature of the liquid.

[0026] Through the above process, firstly, compared with the heating mode of the heating device casted by aluminum and heating tube, the heating mode of the thick film heating portion 11 in the embodiment of the application rises faster in temperature during heating; secondly, further combined with the complete conduction of the switch branch 22, the thick film heating portion 11 is heated at maximum power, which is conducive to realizing the rapid heating of the liquid; thirdly, it can be understood that, in actual application, in order to rapidly heat, the pipe 12 is usually arranged to be relatively long and slender, which is easy to cause the temperature difference between the head and the tail of the pipe 12. However, the embodiment of the application can reduce the adverse effects caused by the temperature difference due to the long pipe by adjusting the length of time for outputting the heating signal according to the temperature detection results of different positions, so as to adjust the heating temperature of the liquid, thereby being conducive to improving the accuracy of the heating temperature. In summary, the rapid heating of the liquid is realized while the accuracy of the heating temperature is improved.

[0027] In some embodiments, as shown in Figure 2 the switch branch 22 includes a current amplification unit 221 and a switch unit 222. The current amplification unit 221 is electrically connected to the controller 21, and the switch unit 222 is connected to the current amplification unit 221 and is in series with the thick film heating portion 11 between the first end and the second end of the AC power supply 200.

[0028] Specifically, the current amplification unit 221 is configured to amplify the current corresponding to the heating signal and output. The switch unit 222 is configured to be turned on in response to the current output by the current amplification unit 221 to form a loop for the AC power supply 200 to supply power to the thick film heating portion 11.

[0029] Please refer to Figure 3 , Figure 3An example shows a circuit structure inside the heating device 100. As shown in Figure 3 The current amplification unit 221 includes a first resistor R1, a second resistor R2 and a first switch tube Q1.

[0030] The first resistor R1 and the second resistor R2 are connected in series between the controller 21 and the ground GND, the connection point between the first resistor R1 and the second resistor R2 is connected to the first end of the first switch tube Q1, the second end of the first switch tube Q1 is grounded to the ground GND, and the third end of the first switch tube Q1 is connected to the switch unit 222.

[0031] Specifically, after the heating signal output by the controller 21 acts on the first resistor R1 and the second resistor R2, the generated current is the current corresponding to the heating signal (i.e. the base current of the first switch tube Q1), and based on the amplification characteristics of the triode, the amplified current (i.e. the collector current of the first switch tube Q1) is generated at the collector of the first switch tube Q1. The collector current of the first switch tube Q1 is β times the base current, and β is determined by the model of the triode, usually between 20 and 500.

[0032] In this embodiment, the first switch tube Q1 is taken as an example of NPN triode. The first end of the first switch tube Q1 is the gate of the NPN triode, the second end of the first switch tube Q1 is the emitter of the NPN triode, and the third end of the first switch tube Q1 is the collector of the NPN triode. In other embodiments, other controllable switches can also be used, such as PNP triode, etc.

[0033] In some embodiments, the switch unit 222 includes a third resistor R3, a fourth resistor R4, a first capacitor C1 and a thyristor U1.

[0034] The third resistor R3 and the fourth resistor R4 are connected in series between the current amplification unit 221 and the second end of the alternating current power supply 200, the connection point between the third resistor R3 and the fourth resistor R4 is connected to the control end of the thyristor U1 (i.e. the third pin of the thyristor U1), the first capacitor C1 is connected in parallel with the fourth resistor R4, the first end of the non-control end of the thyristor U1 (i.e. the second pin of the thyristor U1) is connected to the first end of the alternating current power supply 200 through the thick film heating part 11, and the second end of the non-control end of the thyristor U1 (i.e. the first pin of the thyristor U1) is connected to the second end of the alternating current power supply 200.

[0035] Specifically, when the collector of the first switch tube Q1 generates current, the thyristor U1 can be driven to be turned on, and is fully turned on, that is, the first end of the non-control end of the thyristor U1 is in communication with the second end of the non-control end of the thyristor U1, the AC power supply 200, the thick film heating part 11 and the thyristor U1 form a loop, the AC power supply 200 supplies power to the thick film heating part 11, and the thick film heating part 11 heats at the maximum power, thereby facilitating the rapid heating of the liquid.

[0036] In some embodiments, the first temperature detection branch 23 includes a first thermistor NR1, a fifth resistor R5, a sixth resistor R6 and a second capacitor C2.

[0037] The fifth resistor R5 and the first thermistor NR1 are connected in series between the first power supply VC1 and the ground GND, the connection point between the fifth resistor R5 and the first thermistor NR1 is connected to the ground GND through the sixth resistor R6 and the second capacitor C2 in turn, and the connection point between the sixth resistor R6 and the second capacitor C2 is connected to the controller 21.

[0038] Specifically, the sixth resistor R6 and the second capacitor C2 are used for filtering. The fifth resistor R5 and the first thermistor NR1 are used for voltage division of the first power supply VC1, and the voltage division of the first power supply VC1 on the first thermistor NR1 is taken as the first detection signal, which is input to the controller 21 after filtering. Then, the controller 21 can determine the resistance value of the first thermistor NR1 according to the first detection signal. Since the resistance value of the first thermistor NR1 changes with temperature, that is, the resistance value of the first thermistor NR1 has a corresponding relationship with temperature, the controller 21 can determine the detected temperature accordingly after determining the resistance value of the first thermistor NR1.

[0039] The first thermistor NR1 can be a negative temperature coefficient (NTC) thermistor, the resistance value of which decreases with the increase of temperature, or a positive temperature coefficient (PTC) thermistor, which is opposite to the NTC, and the resistance value of the PTC thermistor increases with the increase of temperature.

[0040] In some embodiments, the second temperature detection branch 24 includes a second thermistor NR2, a seventh resistor R7, an eighth resistor R8 and a third capacitor C3.

[0041] The seventh resistor R7 and the second thermistor NR2 are connected in series between the first power supply VC1 and the ground GND, the connection point between the seventh resistor R7 and the second thermistor NR2 is connected to the ground GND through the eighth resistor R8 and the third capacitor C3 in turn, and the connection point between the eighth resistor R8 and the third capacitor C3 is connected to the controller 21.

[0042] Specifically, the eighth resistor R8 and the third capacitor C3 are used for filtering. The seventh resistor R7 and the second thermistor NR2 are used for voltage division of the first power supply VCl, and the voltage division of the first power supply VCl on the second thermistor NR2 is taken as the second detection signal, which is input to the controller 21 after filtering. Then, the controller 21 can determine the resistance value of the second thermistor NR2 according to the second detection signal. The resistance value of the second thermistor NR2 changes with temperature, that is, the resistance value of the second thermistor NR2 has a corresponding relationship with temperature, so that the controller 21 can determine the detected temperature according to the resistance value of the second thermistor NR2.

[0043] Similarly, the second thermistor NR2 can be a negative temperature coefficient thermistor or a positive temperature coefficient thermistor.

[0044] The embodiments of the present application also provide an electronic device, which comprises the heating device 100 in any of the embodiments of the present application.

[0045] In some embodiments, the electronic device is a coffee machine.

[0046] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

[0047] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; the technical features of the above embodiments or different embodiments can also be combined under the idea of the present application, and the steps can be implemented in any order. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heating device, characterized in that, The application relates to a heating assembly and a control circuit thereof. The heating assembly comprises a thick-film heating part and a pipeline, the thick-film heating part is arranged in the pipeline, and the pipeline is used for flowing liquid; The control circuit is electrically connected with the thick-film heating part and is used for controlling the heating process of the heating assembly, and the control circuit comprises a controller, a switching branch, a first temperature detection branch and a second temperature detection branch; The controller is used for outputting a heating signal; The switching branch is electrically connected with the controller, the switching branch is connected in series with the thick-film heating part between a first end and a second end of an alternating-current power supply, and the switching branch is used for conducting in response to the heating signal to form a loop in which the alternating-current power supply supplies power to the thick-film heating part; The first temperature detection branch is arranged in the thick-film heating part, the first temperature detection branch is electrically connected with the controller, and the first temperature detection branch is used for outputting a first detection signal to the controller based on the temperature of the thick-film heating part; The second temperature detection branch is arranged at an outlet of the pipeline through which the liquid flows out, the second temperature detection branch is electrically connected with the controller, and the second temperature detection branch is used for outputting a second detection signal to the controller based on the temperature of the liquid at the outlet of the pipeline; The controller is further used for adjusting the time length of outputting the heating signal in a control period according to the first detection signal and the second detection signal, wherein the control period comprises the time length of outputting the heating signal and the time length of not outputting the heating signal.

2. The heating device of claim 1, wherein The switching branch comprises: A current amplification unit which is electrically connected with the controller and is used for amplifying and outputting a current corresponding to the heating signal; A switching unit which is connected with the current amplification unit and is connected in series with the thick-film heating part between the first end and the second end of the alternating-current power supply and is used for conducting in response to the current output by the current amplification unit to form the loop in which the alternating-current power supply supplies power to the thick-film heating part.

3. The heating device of claim 2, wherein, The current amplification unit comprises a first resistor, a second resistor and a first switching tube; The first resistor and the second resistor are connected in series between the controller and the ground, a connection point between the first resistor and the second resistor is connected with a first end of the first switching tube, a second end of the first switching tube is grounded, and a third end of the first switching tube is connected with the switching unit.

4. The heating device of claim 3, wherein The first switching tube is an NPN triode; The first end of the first switching tube is a gate of the NPN triode, the second end of the first switching tube is an emitter of the NPN triode, and the third end of the first switching tube is a collector of the NPN triode.

5. The heating device of claim 2, wherein, The switching unit comprises a third resistor, a fourth resistor, a first capacitor and a thyristor; The third resistor and the fourth resistor are connected in series between the current amplification unit and the second end of the alternating-current power supply, a connection point between the third resistor and the fourth resistor is connected with a control end of the thyristor, the first capacitor is connected in parallel with the fourth resistor, a first end of a non-control end of the thyristor is connected with the first end of the alternating-current power supply through the thick-film heating part, and a second end of the non-control end of the thyristor is connected with the second end of the alternating-current power supply.

6. The heating device of claim 1, wherein, The first temperature detection branch comprises a first thermistor, a fifth resistor, a sixth resistor and a second capacitor; The fifth resistor and the first thermistor are connected in series between a first power supply and ground, a connection point between the fifth resistor and the first thermistor is connected to ground through the sixth resistor and the second capacitor in sequence, and a connection point between the sixth resistor and the second capacitor is connected to the controller.

7. The heating device of claim 1, wherein The second temperature detection branch comprises a second thermistor, a seventh resistor, an eighth resistor and a third capacitor; The seventh resistor and the second thermistor are connected in series between a first power supply and ground, a connection point between the seventh resistor and the second thermistor is connected to ground through the eighth resistor and the third capacitor in sequence, and a connection point between the eighth resistor and the third capacitor is connected to the controller.

8. An electronic device, comprising: The heating device comprises the heating device according to any one of claims 1-7.

9. The electronic device of claim 8, wherein, The electronic device is a coffee machine.

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