Heating control circuit for heating assembly and heating equipment

Abstract

The utility model discloses a heating control circuit for a heating component and heating equipment. The heating control circuit comprises a main control circuit, a switching circuit, a first voltage division circuit, a second voltage division circuit and a zero-crossing signal detection circuit, the control end of the switching circuit is connected with the main control circuit, and when the silicon controlled rectifier in the switching circuit is switched on, the first end of the switching circuit is communicated with the second end of the switching circuit; the first output end of the first voltage division circuit and the second output end of the first voltage division circuit are respectively connected with the main control circuit; the output end of the second voltage division circuit is connected with the main control circuit; when the zero-cross detection signal, the first level signal, the second level signal and the third level signal exist at the same time, a fourth level signal can be generated, and when the control end of the switching circuit receives the fourth level signal, the silicon controlled rectifier is switched on. The heating control circuit can realize the detection and control of the heating component only by connecting three wires, the production cost is reduced, the process is simple, and the wiring is convenient.

Description

Technical Field

[0001] This application relates to the field of heating control technology, specifically to a heating control circuit and heating device for a heating component. Background Technology

[0002] Some heating devices, such as electric blankets and heated shawls, have internal heating elements. By controlling the heating temperature of these elements, people can achieve the purpose of keeping warm, which is very popular.

[0003] Currently, the controller for controlling heating components is based on four-wire control. That is, the controller needs to be connected to the heating component with four wires to achieve the purpose of controlling the heating component. Although the controller based on four-wire control of heating components can control the heating component, the need for four wires leads to high production costs, complicated processes, and inconvenient wiring. Utility Model Content

[0004] This application provides a heating control circuit and heating device for a heating component. The technical problem to be solved is that the current controller based on four-wire control has high production costs, complicated processes, and inconvenient wiring due to the need for four wires.

[0005] According to a first aspect, one embodiment provides a heating control circuit for a heating component, the heating component including a heating layer and a first heating wire and a second heating wire connected in parallel on the heating layer, one end of the first heating wire being used to connect to an AC power source, the heating control circuit including: a main control circuit, a switching circuit with a thyristor, a first voltage divider circuit, a second voltage divider circuit, and a zero-crossing signal detection circuit;

[0006] The switching circuit includes a first terminal, a second terminal, and a control terminal. The control terminal of the switching circuit is connected to the main control circuit. The first terminal of the switching circuit is connected to one end of the second heating wire. The second terminal of the switching circuit is grounded. When the thyristor in the switching circuit is turned on, the first terminal of the switching circuit is connected to the second terminal of the switching circuit.

[0007] The zero-crossing signal detection circuit includes a zero-crossing signal input terminal and a zero-crossing signal output terminal. The zero-crossing signal input terminal is used to connect to the AC source, and the zero-crossing signal detection circuit is used to output a zero-crossing detection signal when the AC source is at a zero-crossing point.

[0008] The first voltage divider circuit includes an input terminal, a first output terminal, and a second output terminal. The input terminal of the first voltage divider circuit is connected to the other end of the first heating wire. The first output terminal and the second output terminal of the first voltage divider circuit are respectively connected to the main control circuit. The first voltage divider circuit is used to maintain the first output terminal of the first voltage divider circuit to output a first level signal when the two ends of the first heating wire are conducting, and to maintain the second output terminal of the first voltage divider circuit to output a second level signal when the first heating wire and the second heating wire are not short-circuited.

[0009] The second voltage divider circuit includes an input terminal and an output terminal. The input terminal of the second voltage divider circuit is connected to one end of the second heating wire, and the output terminal of the second voltage divider circuit is connected to the main control circuit. The second voltage divider circuit is used to maintain the output terminal of the second voltage divider circuit to output a third level signal when the two ends of the second heating wire are conducting.

[0010] When the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are present simultaneously, a fourth level signal can be generated. When the control terminal of the switching circuit receives the fourth level signal, it turns on the thyristor.

[0011] Optionally, a fifth level signal can be generated when any one or more of the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are not output, and the control terminal of the switching circuit disconnects the thyristor when it receives the fifth level signal.

[0012] Optionally, the first voltage divider circuit includes: a first diode, a first sub-voltage divider circuit, and a second sub-voltage divider circuit;

[0013] The positive terminal of the first diode is connected to the other end of the first heating wire;

[0014] The first sub-voltage divider circuit includes an input terminal and an output terminal. The input terminal of the first sub-voltage divider circuit is connected to the negative terminal of the first diode, and the output terminal of the first sub-voltage divider circuit is the second output terminal of the first voltage divider circuit.

[0015] The second sub-voltage divider circuit includes an input terminal and an output terminal. The input terminal of the second sub-voltage divider circuit is connected to the negative terminal of the first diode, and the output terminal of the second sub-voltage divider circuit is the first output terminal of the first voltage divider circuit.

[0016] Optionally, the first sub-voltage divider circuit includes: a first capacitor and a first resistor, a second resistor, a third resistor and a fourth resistor connected in series.

[0017] One end of the first resistor is connected to the negative terminal of the first diode, the connection end of the second resistor and the third resistor is the output terminal of the first sub-voltage divider circuit, and the connection end of the second resistor and the third resistor is grounded through the first capacitor;

[0018] The second sub-voltage divider circuit includes: a first Zener diode and a fifth resistor, a sixth resistor, and a seventh resistor connected in series.

[0019] One end of the fifth resistor is connected to the negative terminal of the first diode, the connection point of the sixth and seventh resistors is the output terminal of the second sub-voltage divider circuit, the negative terminal of the first Zener diode is connected to the output terminal of the second sub-voltage divider circuit, and the positive terminal of the first Zener diode is grounded.

[0020] Optionally, the thyristor switching circuit includes: a short-circuit detection sub-circuit, a first thyristor sub-switching circuit and a second thyristor sub-switching circuit respectively provided with thyristors;

[0021] The first thyristor sub-switch circuit includes a first terminal, a second terminal, and a control terminal. The first terminal of the first thyristor sub-switch circuit is the first terminal of the switch circuit. When the thyristor in the first thyristor sub-switch circuit is turned on, the first terminal of the first thyristor sub-switch circuit and the second terminal of the first thyristor sub-switch circuit are connected.

[0022] The second thyristor sub-switch circuit includes a first terminal, a second terminal, and a control terminal. The first terminal of the second thyristor sub-switch circuit is connected to the second terminal of the first thyristor sub-switch circuit. The second terminal of the second thyristor sub-switch circuit is the second terminal of the switch circuit. When the thyristor in the second thyristor sub-switch circuit is turned on, the first terminal of the second thyristor sub-switch circuit and the second terminal of the second thyristor sub-switch circuit are connected.

[0023] The short-circuit detection sub-circuit includes a detection terminal and a feedback terminal. The detection terminal is connected to the negative terminal of the first diode, and the feedback terminal is connected to the main control circuit. The short-circuit detection sub-circuit is used to output an eighth-level signal to the main control circuit when the thyristor in the first thyristor sub-switch circuit is short-circuited.

[0024] Optionally, the second voltage divider circuit includes: an eighth resistor, a second Zener diode, and a second diode, a ninth resistor, and a tenth resistor connected in series.

[0025] One end of the eighth resistor is grounded, and the other end of the eighth resistor and the negative terminal of the second Zener diode are connected to one end of the tenth resistor. The positive terminal of the second diode is connected to one end of the second heating wire, and one end of the tenth resistor is also connected to the main control circuit.

[0026] Optionally, the heating control circuit further includes:

[0027] A gear adjustment component is connected to the main control circuit. The gear adjustment component is used to receive externally input heating gear adjustment parameters and output a sixth level signal according to the heating gear adjustment parameters. The main control circuit responds to the sixth level signal to control the output duration of the fourth level signal.

[0028] Optionally, the gear adjustment component includes a touch screen and an eleventh resistor. The touch screen is connected to the main control circuit through the eleventh resistor. The touch screen is used to receive externally input gear adjustment parameters and output a seventh-level signal according to the gear adjustment parameters. The seventh-level signal is converted into a sixth-level signal through the eleventh resistor.

[0029] Optionally, the heating control circuit further includes: a sound indicator circuit, a display circuit, a protection circuit equipped with a fuse, and a voltage conversion circuit;

[0030] The sound indication circuit is connected to the main control circuit. The main control circuit is used to output a ninth level signal when the sixth level signal is received, and the sound indication circuit emits an indication sound in response to the ninth level signal.

[0031] The display circuit is connected to the main control circuit, and the main control circuit also outputs a tenth level signal in response to the sixth level signal. The display circuit displays the current heating level in response to the tenth level signal.

[0032] One end of the first heating wire is connected to the AC source via the fuse. The protection circuit is used to blow the fuse when the output of the AC source is abnormal, so as to disconnect the first heating wire from the AC source.

[0033] The input terminal of the voltage conversion circuit is connected to the connection between the protection circuit and the first heating wire. The output terminal of the voltage conversion circuit is used to output DC voltage. The voltage conversion circuit is used to convert the input AC power into DC power as the DC power supply for the heating control circuit.

[0034] According to a second aspect, one embodiment provides a heating device including a heating control circuit for a heating component as described above.

[0035] The heating control circuit for the heating element only requires three wires to detect short circuits and open circuits between the first and second heating wires, and can control the heating element to heat the heating layer. This achieves three-wire control, reduces production costs, simplifies the process, and facilitates wiring. Attached Figure Description

[0036] Figure 1 This is a circuit diagram of the heating control circuit used for the heating component;

[0037] Figure 2 This is a circuit diagram of a heating component in one embodiment;

[0038] Figure 3 This is a circuit diagram of the first voltage divider circuit in one embodiment;

[0039] Figure 4 This is a circuit diagram of the second voltage divider circuit in one embodiment;

[0040] Figure 5 This is a circuit structure diagram of a switching circuit in one embodiment;

[0041] Figure 6 This is a circuit structure diagram of the protection circuit in one embodiment;

[0042] Figure 7 This is a circuit diagram of a gear adjustment component in one embodiment;

[0043] Figure 8 This is a circuit diagram of a sound indicator circuit in one embodiment;

[0044] Figure 9 This is a circuit diagram of a voltage conversion circuit in one embodiment;

[0045] Figure 10 This is a circuit structure diagram of the display circuit in one embodiment;

[0046] Figure 11 This is a circuit structure diagram of the main control circuit in one embodiment;

[0047] Figure 12 This is a circuit diagram of a zero-crossing signal detection circuit in one embodiment. Detailed Implementation

[0048] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0049] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0050] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0051] In some heating devices, such as electric blankets and heated shawls, there is a heating element 10 inside. The purpose of heating is achieved by controlling the heating temperature of the heating element 10, which is very popular.

[0052] Currently, when controlling the heating element 10, the controller is based on four-wire control. That is, the controller needs to be connected to the heating element 10 with four wires to achieve the purpose of controlling the heating element 10. Although the controller based on four-wire control of the heating element 10 can control the heating element 10, the need for four wires leads to high production costs, complicated processes, and inconvenient wiring.

[0053] For example, the ATC controller controls the heating element 10 based on four wires (the heating layer 101 in the heating element 10 can be a heating layer 101 made of ATC self-thermostatic heating cable). That is, the ATC controller leads out four terminals, and the heating element 10 is correspondingly provided with four terminals. By connecting the four terminals of the ATC controller to the four terminals of the heating element 10, the heating element 10 can be controlled by the ATC controller.

[0054] This utility model provides a heating control circuit for a heating component. When controlling the heating component 10, only three wiring terminals need to be brought out to achieve control of the heating component 10, which reduces production costs, simplifies the process, and facilitates wiring.

[0055] In some embodiments, please refer to Figure 2 The heating component 10 may include a heating layer 101 and a first heating wire RL1 and a second heating wire RL2 arranged in parallel on the heating layer 101. One end H1 of the first heating wire RL1 is used to connect to an AC source, wherein the AC source may be, but is not limited to, 120V / 60HZ. The heating layer 101 may be a heating layer 101 made of ATC self-heating heating wire.

[0056] Please refer to Figure 1 and Figure 2 The heating control circuit for the heating component may include a main control circuit 11, a switching circuit 14 equipped with a thyristor, a first voltage divider circuit 12, a second voltage divider circuit 13, and a zero-crossing signal detection circuit 15.

[0057] The switching circuit 14 includes a first terminal, a second terminal, and a control terminal. The control terminal of the switching circuit 14 is connected to the main control circuit 11. The first terminal of the switching circuit 14 is connected to one end H4 of the second heating wire RL2. The second terminal of the switching circuit 14 is grounded. When the thyristor in the switching circuit 14 is turned on, the first terminal of the switching circuit 14 is connected to the second terminal of the switching circuit 14.

[0058] The zero-crossing signal detection circuit 15 includes a zero-crossing signal input terminal and a zero-crossing signal output terminal. The zero-crossing signal input terminal is used to connect to an AC source, and the zero-crossing signal detection circuit 15 is used to output a zero-crossing detection signal when the AC source is at a zero-crossing point.

[0059] The first voltage divider circuit 12 includes an input terminal, a first output terminal, and a second output terminal. The input terminal of the first voltage divider circuit 12 is connected to the other end H3 of the first heating wire RL1. The first output terminal and the second output terminal of the first voltage divider circuit 12 are respectively connected to the main control circuit 11. The first voltage divider circuit 12 is used to maintain the first output terminal of the first voltage divider circuit 12 to output a first level signal when the two ends of the first heating wire RL1 are conducting, and to maintain the second output terminal of the first voltage divider circuit 12 to output a second level signal when the first heating wire RL1 and the second heating wire RL2 are not short-circuited.

[0060] The second voltage divider circuit 13 includes an input terminal and an output terminal. The input terminal of the second voltage divider circuit 13 is connected to one end H4 of the second heating wire RL2, and the output terminal of the second voltage divider circuit 13 is connected to the main control circuit 11. The second voltage divider circuit 13 is used to maintain the output terminal of the second voltage divider circuit 13 to output a third level signal when the two ends of the second heating wire RL2 are turned on.

[0061] When the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are present simultaneously, a fourth level signal can be generated. When the control terminal of the switching circuit 14 receives the fourth level signal, it turns on the thyristor.

[0062] Specifically, after the first heating wire RL1 is connected to the AC source, if the first heating wire RL1 can conduct normally, the first voltage divider circuit 12 can maintain the output of a first level signal at its first output terminal. When there is no short circuit between the first heating wire RL1 and the second heating wire RL2, the first voltage divider circuit 12 can maintain the output of a second level signal at its second output terminal. That is, if the first output terminal of the first voltage divider circuit 12 outputs a first level signal and the second output terminal of the first voltage divider circuit 12 outputs a second level signal, it indicates that the first heating wire RL1 is not disconnected and there is no short circuit between the first heating wire RL1 and the second heating wire RL2.

[0063] If the second heating wire RL2 can conduct normally, the second voltage divider circuit 13 can maintain the output of the third level signal at its output terminal. That is, when the output of the second voltage divider circuit 13 is the third level signal, it means that the second heating wire RL2 is not disconnected.

[0064] The first output terminal of the first voltage divider circuit 12 outputs a first level signal, the second output terminal of the first voltage divider circuit 12 outputs a second level signal, and the output terminal of the second voltage divider circuit 13 outputs a third level signal. At this time, when the zero-crossing signal output terminal outputs a zero-crossing detection signal, the control circuit can generate a fourth level signal and output it to the switching circuit 14. When the control terminal of the switching circuit 14 receives the fourth level signal, the thyristor is turned on.

[0065] Therefore, it can be seen that the heating control circuit for the heating component only needs to connect three wires to detect short circuits and open circuits between the first heating wire RL1 and the second heating wire RL2 when controlling the heating component 10. It can also control the heating component 10 to heat the heating layer 101, realizing three-wire control (the other end H2 of the second heating wire RL2 is in a floating state), reducing production costs, simplifying the process, and making wiring convenient.

[0066] Furthermore, a fifth level signal is generated when any one or more of the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are not output. When the control terminal of the switching circuit 14 receives the fifth level signal, it disconnects the thyristor.

[0067] Specifically, if any one or more of the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are not output, it indicates that the conditions for turning on the thyristor are not met. For example, if the first level signal is not output, the first heating wire RL1 may be in an open state; as another example, if the second level signal is not output, there may be a short circuit between the first heating wire RL1 and the second heating wire RL2; if the third level signal is not output, the second heating wire RL2 may be in an open state; as yet another example, if the zero-crossing detection signal is not output, it indicates that the AC source is not at the zero-crossing point.

[0068] Therefore, the heating control circuit used for the heating component can also play a protective role. That is, when one or more of the following situations occur, the heating component 10 will stop heating: the first heating wire RL1 is disconnected, the second heating wire RL2 is disconnected, the first heating wire RL1 and the second heating wire RL2 are short-circuited, and the AC source is not at the zero crossing point.

[0069] In some embodiments, please refer to Figure 1 and Figure 3 The first voltage divider circuit 12 may include a first diode D1, a first sub-voltage divider circuit 122, and a second sub-voltage divider circuit 121.

[0070] The positive terminal of the first diode D1 is connected to the other end of the first heating wire RL1.

[0071] The first sub-voltage divider circuit 122 includes an input terminal and an output terminal. The input terminal of the first sub-voltage divider circuit 122 is connected to the negative terminal of the first diode D1, and the output terminal of the first sub-voltage divider circuit 122 is the second output terminal of the first voltage divider circuit 12.

[0072] In one specific embodiment, please continue to refer to Figure 3 The first sub-voltage divider circuit 122 may include a first capacitor C1 and a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 connected in series. One end of the first resistor R1 is connected to the negative terminal of the first diode D1, the connection end of the second resistor R2 and the third resistor R3 is the output terminal of the first sub-voltage divider circuit 122, and the connection end of the second resistor R2 and the third resistor R3 is grounded through the first capacitor C1.

[0073] When there is no short circuit between the first heating wire RL1 and the second heating wire RL2, the connection terminal of the second resistor R2 and the third resistor R3 (the output terminal of the first sub-voltage divider circuit 122) outputs a voltage signal (which is the second level signal); when there is a short circuit between the first heating wire RL1 and the second heating wire RL2, the connection terminal of the second resistor R2 and the third resistor R3 outputs another voltage signal.

[0074] Therefore, it can be seen that the voltage signal output from the connection terminal of the second resistor R2 and the third resistor R3 can be used to determine whether there is a short circuit between the first heating wire RL1 and the second heating wire RL2.

[0075] Of course, the first sub-voltage divider circuit 122 can also be other circuit structures that can achieve the above functions. Those skilled in the art can determine the specific circuit structure of the first sub-voltage divider circuit 122 according to the actual situation, which will not be elaborated here.

[0076] In this embodiment, the anode of the first diode D1 is the input terminal of the first voltage divider circuit 12. The unconnected ends of the first resistor R1 and the second resistor R2 are the input terminals of the first sub-voltage divider circuit 122. The connection point of the second resistor R2 and the third resistor R3 is the output terminal of the first sub-voltage divider circuit 122, which is also the second output terminal of the first voltage divider circuit 12.

[0077] The second sub-voltage divider circuit 121 includes an input terminal and an output terminal. The input terminal of the second sub-voltage divider circuit 121 is connected to the negative terminal of the first diode D1, and the output terminal of the second sub-voltage divider circuit 121 is the first output terminal of the first voltage divider circuit 12.

[0078] In one specific embodiment, please continue to refer to Figure 3 The second sub-voltage divider circuit 121 includes an input terminal and an output terminal. The input terminal of the second sub-voltage divider circuit 121 is connected to the negative terminal of the first diode D1, and the output terminal of the second sub-voltage divider circuit 121 is the first output terminal of the first voltage divider circuit 12.

[0079] Please refer to Figure 4 The second sub-voltage divider circuit 121 may include a first Zener diode DZ1 and a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7 connected in series. One end of the fifth resistor R5 is connected to the cathode of the first diode D1, the connection point of the sixth resistor R6 and the seventh resistor R7 is the output terminal of the second sub-voltage divider circuit 121, the cathode of the first Zener diode DZ1 is connected to the output terminal of the second sub-voltage divider circuit 121, and the anode of the first Zener diode DZ1 is grounded.

[0080] When the first heating wire RL1 is not disconnected, the connection terminal of the sixth resistor R6 and the seventh resistor R7 (the output terminal of the second sub-voltage divider circuit 121) outputs a voltage signal (which is the first level signal); when the first heating wire RL1 is disconnected, the connection terminal of the sixth resistor R6 and the seventh resistor R7 outputs another voltage signal. It can be seen that whether the first heating wire RL1 is disconnected can be determined by the voltage signal output from the connection terminal of the sixth resistor R6 and the seventh resistor R7.

[0081] Similarly, the second sub-voltage divider circuit 121 can also be other circuit structures that can achieve the above functions. Those skilled in the art can determine the specific circuit structure of the second sub-voltage divider circuit 121 according to the actual situation, which will not be elaborated here.

[0082] In some embodiments, please refer to Figure 1 , Figure 5 The thyristor switch circuit 14 may include a short-circuit detection sub-circuit 143, a first thyristor sub-switch circuit 141 and a second thyristor sub-switch circuit 142 respectively equipped with thyristors.

[0083] The first thyristor sub-switch circuit 141 includes a first terminal, a second terminal, and a control terminal. The first terminal of the first thyristor sub-switch circuit 141 is the first terminal of the switch circuit 14. When the thyristor in the first thyristor sub-switch circuit 141 is turned on, the first terminal of the first thyristor sub-switch circuit 141 and the second terminal of the first thyristor sub-switch circuit 141 are connected.

[0084] Please continue to refer to this. Figure 5 The first terminal of the first thyristor sub-switch circuit 141 is the T2 terminal of the thyristor T1, the second terminal of the first thyristor sub-switch circuit 141 is the T1 terminal of the thyristor T1, and the control terminal of the first thyristor sub-switch circuit 141 is the unconnected end of the sixteenth resistor R16 and the seventeenth resistor R17.

[0085] The second thyristor sub-switch circuit 142 includes a first terminal, a second terminal, and a control terminal. The first terminal of the second thyristor sub-switch circuit 142 is connected to the second terminal of the first thyristor sub-switch circuit 141. The second terminal of the second thyristor sub-switch circuit 142 is the second terminal of the switch circuit 14. When the thyristor in the second thyristor sub-switch circuit 142 is turned on, the first terminal of the second thyristor sub-switch circuit 142 and the second terminal of the second thyristor sub-switch circuit 142 are connected.

[0086] Please continue to refer to this. Figure 5 The first terminal of the second controlled silicon sub-switch circuit 14 is the T2 terminal of the controlled silicon T2, the second terminal of the second controlled silicon sub-switch circuit 142 is the T1 terminal of the controlled silicon T2, and the control terminal of the second controlled silicon sub-switch circuit 142 is the unconnected end of the fifth capacitor C5 and the nineteenth resistor R19.

[0087] The short-circuit detection sub-circuit 143 includes a detection terminal and a feedback terminal. The detection terminal is connected to the negative terminal of the first diode D1, and the feedback terminal is connected to the main control circuit 11. The short-circuit detection sub-circuit 143 is used to output an eighth-level signal to the main control circuit 11 when the thyristor in the first thyristor sub-switch circuit 141 is short-circuited.

[0088] Please continue to refer to this. Figure 5 The detection terminal of the short-circuit detection sub-circuit 143 is the unconnected end of the twenty-first resistor R21 and the twelfth resistor R12. The feedback terminal of the short-circuit detection sub-circuit 143 is the unconnected end of the fifteenth resistor R15 and the twelfth resistor R12. When the detection terminal of the short-circuit detection sub-circuit 143 is connected, it is connected to the negative terminal of the second diode D2.

[0089] Specifically, when the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are present simultaneously, the main control circuit 11 outputs a level signal to the control terminal of the first thyristor sub-switch circuit 141, so that the internal thyristor is turned on, thereby connecting the first terminal and the second terminal of the first thyristor sub-switch circuit 141, wherein the first terminal of the first thyristor sub-switch circuit 141 is the first terminal of the switch circuit 14.

[0090] At the same time, the main control circuit 11 will also output a level signal to the control terminal of the second thyristor sub-switch circuit 142, so that the thyristor inside it is turned on, so as to connect the first terminal and the second terminal of the second thyristor sub-switch circuit 142, wherein the second terminal of the second thyristor sub-switch circuit 142 is the second terminal of the switch circuit 14.

[0091] Therefore, when both the thyristor in the first thyristor sub-switch circuit 141 and the thyristor in the second thyristor sub-switch circuit 142 are turned on, the first end of the switch circuit 14 and the second end of the switch circuit 14 are connected.

[0092] It should be noted that, in this case, the level signal received by the control terminal of the first thyristor sub-switch circuit 141 and the level signal received by the control terminal of the second thyristor sub-switch circuit 142 are collectively referred to as the fourth level signal.

[0093] In another scenario, when the short-circuit detection sub-circuit 143 detects that the thyristor in the first thyristor sub-circuit 141 is in a short-circuit state, the feedback terminal of the short-circuit detection sub-circuit 143 outputs an eighth-level signal to the main control circuit 11. When the first terminal and the second terminal of the switch circuit 14 are connected, it is not necessary to control the thyristor in the first thyristor sub-circuit 141. That is, the main control circuit 11 only needs to output a level signal to the control terminal of the second thyristor sub-circuit 142 to connect the first terminal and the second terminal of the second thyristor sub-circuit 142. At this time, the first terminal and the second terminal of the switch circuit 14 are in a connected state.

[0094] This further illustrates that the method of heating the heating component 10 by setting two thyristors to conduct is safer than the method of heating the heating component 10 by only one thyristor conducting.

[0095] It should be noted that, in this case, the level signal received by the control terminal of the second thyristor sub-switch circuit 142 is the fourth level signal.

[0096] It should also be noted that the first thyristor sub-switch circuit 141 can be any circuit structure capable of achieving the above functions. Those skilled in the art can determine the specific circuit structure of the first thyristor sub-switch circuit 141 according to the actual situation, and no further limitations are imposed here. Similarly, the second thyristor sub-switch circuit 142 can be any circuit structure capable of achieving the above functions. Those skilled in the art can determine the specific circuit structure of the second thyristor sub-switch circuit 142 according to the actual situation, and no further limitations are imposed here.

[0097] It should also be noted that the short-circuit detection sub-circuit 143 is actually a voltage divider circuit. The detection terminal of the short-circuit detection sub-circuit 143 is actually the input terminal of the voltage divider circuit, and the feedback terminal of the short-circuit detection sub-circuit 143 is actually the output terminal of the voltage divider circuit. Therefore, the short-circuit detection sub-circuit 143 can be any circuit structure that can achieve the above functions. Those skilled in the art can determine the specific circuit structure of the short-circuit detection sub-circuit 143 according to the actual situation, and no further restrictions are imposed here.

[0098] In some embodiments, please refer to Figure 4 The second voltage divider circuit 13 may include an eighth resistor R8, a second Zener diode DZ2, and a second diode D2, a ninth resistor R9, and a tenth resistor R10 connected in series.

[0099] Among them, one end of the eighth resistor R8 is grounded, the other end of the eighth resistor R8 and the negative terminal of the second Zener diode DZ2 are connected to one end of the tenth resistor R10, the positive terminal of the second diode D2 is connected to one end of the second heating wire RL2, and one end of the tenth resistor R10 is also connected to the main control circuit 11.

[0100] When determining whether the second heating wire is disconnected, it can be determined by the voltage signal at the unconnected end of the tenth resistor R10 and the ninth resistor R9. When the second heating wire is not disconnected, the unconnected end of the tenth resistor R10 and the ninth resistor R9 outputs a voltage signal (this voltage signal can be considered as a third level signal). When the second heating wire is disconnected, the unconnected end of the tenth resistor R10 and the ninth resistor R9 outputs another voltage signal.

[0101] In this embodiment, the unconnected end of the tenth resistor R10 and the ninth resistor R9 is the output terminal of the second voltage divider circuit 13, and the positive terminal of the second diode D2 is the input terminal of the second voltage divider circuit 13.

[0102] In some embodiments, please refer to Figure 1 The heating control circuit for the heating element also includes a gear adjustment component 16, which is connected to the main control circuit 11. The gear adjustment component 16 is used to receive externally input heating gear adjustment parameters and output a sixth level signal according to the heating gear adjustment parameters. The main control circuit 11 responds to the sixth level signal to control the output duration of the fourth level signal.

[0103] Specifically, when controlling the heating component 10, the heating duration of the heating component 10 can be controlled according to actual needs. That is, the heating duration of the heating component 10 can be controlled by controlling the duration for which the thyristor in the first thyristor sub-switch circuit 141 and the thyristor in the second thyristor sub-switch circuit 142 are simultaneously turned on.

[0104] In this embodiment, the gear adjustment component 16 can be set with multiple heating gears, each heating gear corresponding to a heating duration. In a specific application, if the user sets the gear adjustment component 16 to a heating gear, the gear adjustment component will output the level signal (sixth level signal) corresponding to that heating gear. When the main control circuit 11 receives the level signal, it controls the simultaneous conduction time of the thyristor in the first thyristor sub-switch circuit 141 and the thyristor in the second thyristor sub-switch circuit 142 according to the level signal.

[0105] When adjusting the gear, the gear adjustment component 16 can be set to the target heating gear (the heating gear to be adjusted to). The gear adjustment component 16 will then output the level signal (sixth level signal) corresponding to the target heating gear. When the main control circuit 11 receives the level signal, it controls the simultaneous conduction time of the thyristor in the first thyristor sub-switch circuit 141 and the thyristor in the second thyristor sub-switch circuit 142 according to the level signal.

[0106] It should be noted that, based on the gear adjustment process of the gear adjustment component 16 described above, the gear adjustment component 16 outputs the corresponding sixth level signal to the main control circuit 11 according to the specific heating gear, so as to realize the control logic of adjusting the heating time of the heating component 10 through the main control circuit 11, which is the prior art to those skilled in the art.

[0107] In some embodiments, please refer to Figure 7 The gear adjustment component 16 may include a touch screen 161 and an eleventh resistor R11. The touch screen 161 is connected to the main control circuit 11 through the eleventh resistor R11. The touch screen 161 is used to receive externally input gear adjustment parameters and output a seventh level signal according to the gear adjustment parameters. The seventh level signal is converted into a sixth level signal through the eleventh resistor R11.

[0108] Specifically, the touch control area on the touch screen 161 may be equipped with "+" and "-" icons, allowing users to adjust the heating level of the heating component 10 by selecting to touch the "+" or "-" icon. Furthermore, the touch control area on the touch screen 161 also includes a power touch icon, which can be used to turn the heating control circuit for the heating component on or off.

[0109] Compared to the gear adjustment component 16 using mechanical buttons in the prior art, the gear adjustment component 16 using a touch screen 161 has a more novel appearance and does not require mold opening (mechanical buttons require mold opening), further reducing production costs and production processes.

[0110] In some embodiments, please refer to Figure 1 , Figure 6 , Figure 8 , Figure 9 and Figure 10 The heating control circuit for the heating component also includes an audible indicator circuit 18, a display circuit 20, a protection circuit 19 equipped with a fuse F1, and a voltage conversion circuit 17.

[0111] The sound indication circuit 18 is connected to the main control circuit 11. The main control circuit 11 is used to output a ninth level signal when it receives a sixth level signal. The sound indication circuit 18 responds to the ninth level signal by emitting an indication sound.

[0112] The display circuit 20 is connected to the main control circuit 11. The main control circuit 11 also outputs a tenth level signal in response to the sixth level signal. The display circuit 20 displays the current heating level in response to the tenth level signal.

[0113] One end of the first heating wire RL1 is connected to the AC source via fuse F1. The protection circuit 19 is used to blow the fuse when the output of the AC source is abnormal, so as to disconnect the first heating wire RL1 from the AC source.

[0114] Please refer to Figure 1 and with Figure 9 The input terminal of the voltage conversion circuit 17 (one end of the sixth capacitor C6) is connected to the connection between the protection circuit 19 and the first heating wire RL1. The output terminal of the voltage conversion circuit 17 is used to output DC voltage. The voltage conversion circuit 17 is used to convert the input AC power into DC power to serve as the DC power supply for the heating control circuit.

[0115] In this embodiment, the sound indication circuit 18 can be a sound indication circuit 18 with a buzzer as its core component. Please refer to [reference needed]. Figure 8 , Figure 8 This is a circuit structure of the sound indicator circuit 18 in one embodiment. When the user operates the touch area of ​​the touch screen, the main control circuit 11 outputs a ninth-level signal to power on the buzzer in the sound indicator circuit 18 to emit an indicator sound. For example, when the "+" or "-" icon is touched; or, for example, when the power touch icon is touched. Those skilled in the art can determine the specific circuit structure of the sound indicator circuit 18 according to the actual situation, and no further limitations are made here.

[0116] The display circuit 20 can be a display circuit 20 based on LED (Light Emitting Diode) as the core device. Please refer to [reference needed]. Figure 10 , Figure 10 This is a circuit structure of the display circuit 20 in one embodiment. Specifically, the display circuit 20 has multiple LEDs, with each heating level corresponding to one LED in the heating control circuit for the heating component. When the heating control circuit for the heating component is in a heating level, the main control circuit 11 outputs a tenth-level signal to illuminate the LED corresponding to that heating level. The user can determine the current heating level by observing the illuminated LED. Those skilled in the art can determine the specific circuit structure of the display circuit 20 according to actual conditions, and no further limitations are made here.

[0117] The protection circuit 19 is configured, and the protection circuit 19 can be any circuit structure capable of achieving the above functions. Please refer to [reference needed]. Figure 6The diagram shows the circuit structure of protection circuit 19 in one embodiment. Those skilled in the art can determine the specific circuit structure of protection circuit 19 according to actual conditions, and no further limitations are imposed here.

[0118] Similarly, the voltage conversion circuit 17 can be any circuit structure that can achieve the above functions. Those skilled in the art can determine the specific circuit structure of the voltage conversion circuit 17 according to the actual situation, and no further restrictions are imposed here.

[0119] In some embodiments, the main control circuit 11 may be a circuit structure built with the first chip U1 as the core device.

[0120] Please refer to Figure 11 , Figure 11 In one embodiment, the main control circuit 11 has the following circuit structure: the first chip U1 may be, but is not limited to, an AiPF3216. The main control circuit 11 can also adjust the sensitivity of the touchscreen by adjusting the tenth capacitor C10. The main control circuit 11 can also adjust the heating mode of the heating component 10. Specifically, the touchscreen has a mode adjustment option, which allows adjustment of the heating mode of the heating component 10. In one mode, pin 14 of the first chip U1 is connected to the thirty-third resistor R33; in another mode, pin 14 of the first chip U1 is automatically disconnected from the thirty-third resistor R33.

[0121] In some embodiments, the zero-crossing signal detection circuit 15 can be any circuit structure that can achieve the above functions. Those skilled in the art can determine the specific circuit structure of the zero-crossing signal detection circuit 15 according to the actual situation, but there are no excessive limitations here.

[0122] Please refer to Figure 12 , Figure 12 This is a circuit diagram of a zero-crossing signal detection circuit 15 in one embodiment, wherein, Figure 12 The unconnected ends of the thirty-first resistor R31 and the thirty-second resistor R32 are the zero-crossing signal input terminals of the zero-crossing signal detection circuit 15, and the collector of the transistor Q2 is the zero-crossing signal output terminal of the zero-crossing signal detection circuit 15.

[0123] In some embodiments, the present invention also provides a heating device, which includes a heating control circuit for a heating component as described above. Specific details are as described in the above embodiment of a heating control circuit for a heating component, and will not be repeated here.

[0124] In summary, this utility model provides a heating control circuit and heating device for a heating component, which has the following beneficial effects:

[0125] When controlling the heating component 10, only three wires are needed to detect short circuits and open circuits between the first heating wire RL1 and the second heating wire RL2, and to control the heating component 10 to heat the heating layer 101. This achieves three-wire control (the other end of the second heating wire RL2 is in a suspended state), which reduces production costs, simplifies the process, and makes wiring convenient.

[0126] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A heating control circuit for a heating element, the heating element comprising a heating layer and a first heating wire and a second heating wire connected in parallel on the heating layer, one end of the first heating wire being connected to an AC power source, characterized in that, The heating control circuit includes: a main control circuit, a switching circuit equipped with a thyristor, a first voltage divider circuit, a second voltage divider circuit, and a zero-crossing signal detection circuit; The switching circuit includes a first terminal, a second terminal, and a control terminal. The control terminal of the switching circuit is connected to the main control circuit. The first terminal of the switching circuit is connected to one end of the second heating wire. The second terminal of the switching circuit is grounded. When the thyristor in the switching circuit is turned on, the first terminal of the switching circuit is connected to the second terminal of the switching circuit. The zero-crossing signal detection circuit includes a zero-crossing signal input terminal and a zero-crossing signal output terminal. The zero-crossing signal input terminal is used to connect to the AC source, and the zero-crossing signal detection circuit is used to output a zero-crossing detection signal when the AC source is at a zero-crossing point. The first voltage divider circuit includes an input terminal, a first output terminal, and a second output terminal. The input terminal of the first voltage divider circuit is connected to the other end of the first heating wire. The first output terminal and the second output terminal of the first voltage divider circuit are respectively connected to the main control circuit. The first voltage divider circuit is used to maintain the first output terminal of the first voltage divider circuit to output a first level signal when the two ends of the first heating wire are conducting, and to maintain the second output terminal of the first voltage divider circuit to output a second level signal when the first heating wire and the second heating wire are not short-circuited. The second voltage divider circuit includes an input terminal and an output terminal. The input terminal of the second voltage divider circuit is connected to one end of the second heating wire, and the output terminal of the second voltage divider circuit is connected to the main control circuit. The second voltage divider circuit is used to maintain the output terminal of the second voltage divider circuit to output a third level signal when the two ends of the second heating wire are conducting. When the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are present simultaneously, a fourth level signal can be generated. When the control terminal of the switching circuit receives the fourth level signal, it turns on the thyristor.

2. The heating control circuit for a heating element as described in claim 1, characterized in that, When any one or more of the zero-crossing detection signal, the first level signal, the second level signal, and the third level signal are not output, a fifth level signal can be generated. When the control terminal of the switching circuit receives the fifth level signal, it disconnects the thyristor.

3. The heating control circuit for a heating component as described in claim 1 or 2, characterized in that, The first voltage divider circuit includes: a first diode, a first sub-voltage divider circuit, and a second sub-voltage divider circuit; The positive terminal of the first diode is connected to the other end of the first heating wire; The first sub-voltage divider circuit includes an input terminal and an output terminal. The input terminal of the first sub-voltage divider circuit is connected to the negative terminal of the first diode, and the output terminal of the first sub-voltage divider circuit is the second output terminal of the first voltage divider circuit. The second sub-voltage divider circuit includes an input terminal and an output terminal. The input terminal of the second sub-voltage divider circuit is connected to the negative terminal of the first diode, and the output terminal of the second sub-voltage divider circuit is the first output terminal of the first voltage divider circuit.

4. The heating control circuit for a heating component as described in claim 3, characterized in that, The first sub-voltage divider circuit includes: a first capacitor and a first resistor, a second resistor, a third resistor and a fourth resistor connected in series. One end of the first resistor is connected to the negative terminal of the first diode, the connection end of the second resistor and the third resistor is the output terminal of the first sub-voltage divider circuit, and the connection end of the second resistor and the third resistor is grounded through the first capacitor; The second sub-voltage divider circuit includes: a first Zener diode and a fifth resistor, a sixth resistor, and a seventh resistor connected in series. One end of the fifth resistor is connected to the negative terminal of the first diode, the connection point of the sixth and seventh resistors is the output terminal of the second sub-voltage divider circuit, the negative terminal of the first Zener diode is connected to the output terminal of the second sub-voltage divider circuit, and the positive terminal of the first Zener diode is grounded.

5. The heating control circuit for a heating element as described in claim 3, characterized in that, The thyristor switch circuit includes: a short-circuit detection sub-circuit, a first thyristor sub-switch circuit and a second thyristor sub-switch circuit, each equipped with a thyristor. The first thyristor sub-switch circuit includes a first terminal, a second terminal, and a control terminal. The first terminal of the first thyristor sub-switch circuit is the first terminal of the switch circuit. When the thyristor in the first thyristor sub-switch circuit is turned on, the first terminal of the first thyristor sub-switch circuit and the second terminal of the first thyristor sub-switch circuit are connected. The second thyristor sub-switch circuit includes a first terminal, a second terminal, and a control terminal. The first terminal of the second thyristor sub-switch circuit is connected to the second terminal of the first thyristor sub-switch circuit. The second terminal of the second thyristor sub-switch circuit is the second terminal of the switch circuit. When the thyristor in the second thyristor sub-switch circuit is turned on, the first terminal of the second thyristor sub-switch circuit and the second terminal of the second thyristor sub-switch circuit are connected. The short-circuit detection sub-circuit includes a detection terminal and a feedback terminal. The detection terminal is connected to the negative terminal of the first diode, and the feedback terminal is connected to the main control circuit. The short-circuit detection sub-circuit is used to output an eighth-level signal to the main control circuit when the thyristor in the first thyristor sub-switch circuit is short-circuited.

6. The heating control circuit for a heating component as described in claim 1 or 2, characterized in that, The second voltage divider circuit includes: an eighth resistor, a second Zener diode, and a second diode, a ninth resistor, and a tenth resistor connected in series. One end of the eighth resistor is grounded, and the other end of the eighth resistor and the negative terminal of the second Zener diode are connected to one end of the tenth resistor. The positive terminal of the second diode is connected to one end of the second heating wire, and one end of the tenth resistor is also connected to the main control circuit.

7. The heating control circuit for a heating component as described in claim 1 or 2, characterized in that, The heating control circuit also includes: A gear adjustment component is connected to the main control circuit. The gear adjustment component is used to receive externally input heating gear adjustment parameters and output a sixth level signal according to the heating gear adjustment parameters. The main control circuit responds to the sixth level signal to control the output duration of the fourth level signal.

8. The heating control circuit for a heating element as described in claim 7, characterized in that, The gear adjustment component includes a touch screen and an eleventh resistor. The touch screen is connected to the main control circuit through the eleventh resistor. The touch screen is used to receive externally input gear adjustment parameters and output a seventh-level signal according to the gear adjustment parameters. The seventh-level signal is converted into a sixth-level signal through the eleventh resistor.

9. The heating control circuit for a heating element as described in claim 8, characterized in that, The heating control circuit also includes: a sound indicator circuit, a display circuit, a protection circuit with a fuse, and a voltage conversion circuit; The sound indication circuit is connected to the main control circuit. The main control circuit is used to output a ninth level signal when the sixth level signal is received, and the sound indication circuit emits an indication sound in response to the ninth level signal. The display circuit is connected to the main control circuit, and the main control circuit also outputs a tenth level signal in response to the sixth level signal. The display circuit displays the current heating level in response to the tenth level signal. One end of the first heating wire is connected to the AC source via the fuse. The protection circuit is used to blow the fuse when the output of the AC source is abnormal, so as to disconnect the first heating wire from the AC source. The input terminal of the voltage conversion circuit is connected to the connection between the protection circuit and the first heating wire. The output terminal of the voltage conversion circuit is used to output DC voltage. The voltage conversion circuit is used to convert the input AC power into DC power as the DC power supply for the heating control circuit.

10. A heating device, characterized in that, Includes a heating control circuit for a heating component as described in any one of claims 1-9.

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