Heating control system and control method

Abstract

The invention discloses a heating control system and a control method thereof, the heating control system comprises a first heating unit, a zero-crossing detection switch unit, a plurality of wave-losing control driving units, a control unit, an input unit and a voltage conversion unit, and each wave-losing control driving unit comprises an optocoupler driving module and a zero-crossing trigger module; the input end of the optocoupler driving module is electrically connected with the output end of the control unit and the output end of the voltage conversion unit, the output end of the optocoupler driving module is electrically connected with the control end of the zero-crossing trigger module, and the input end of the zero-crossing trigger module is electrically connected with the output end of the voltage conversion unit. The output end of the zero-crossing trigger module and one end of the power supply end are connected in series with the first heating pipe. The control unit determines whether to carry out wave loss control on the first heating pipe or not according to the set heating mode and the collected voltage signal of the power supply end, the working state of the zero-crossing trigger module is controlled, electromagnetic interference is not likely to be generated during wave loss control, high-speed response can be achieved, different heating modes can be achieved, and the barbecue experience feeling is better.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heating control, and particularly relates to a heating control system and a control method thereof. BACKGROUND

[0002] Some conventional heating units on the market have relatively fixed resistance values of heating unit wires and power grid voltages, so that the output power of the heating units is generally fixed, which greatly limits the functionality of the heating units and the use experience of users, and causes the users to be unable to finely control the heating according to different cooking requirements and to adjust the output power.

[0003] A conventional heating control method generally adopts a phase-cut control mode, controls the conduction angle of a thyristor in each half cycle of alternating current, and delays the conduction of the thyristor by an angle after the voltage zero crossing point, so as to achieve stepless power adjustment from 0% to 100%, meet the needs of users for diversified cooking modes, and relatively smooth output current and voltage. However, the control mode of the control system is easily interfered by signals, does not meet the authentication standard, and also affects the normal use of the oven.

[0004] Therefore, it is very important to obtain a heating control system and a control method thereof capable of overcoming the above defects. SUMMARY

[0005] To solve the above technical problems, the application provides a heating control system, which comprises a first heating unit, a zero-crossing detection switch unit for collecting a voltage signal of a power supply end, a plurality of wave loss control driving units, a control unit, an input unit for setting at least a heating mode, and a voltage conversion unit. The first heating unit comprises at least two first heating pipes, and the first heating pipes are one-to-one corresponding to the wave loss control driving units.

[0006] The input end of the wave loss control driving unit, the output end of the zero-crossing detection switch unit, the output end and the input end of the voltage conversion unit, and the input unit are electrically connected with the control unit. The input end of the voltage conversion unit and the input end of the zero-crossing detection switch unit are electrically connected with the power supply end. The output end of the wave loss control driving unit and one end of the power supply end are respectively connected with two ends of the corresponding first heating pipe. The zero-crossing detection switch unit, the wave loss control driving unit, and the input unit are respectively electrically connected with the output end of the voltage conversion unit.

[0007] The wave loss control driving unit comprises an optical coupling driving module and a zero-crossing trigger module; the input ends of the optical coupling driving module are electrically connected with the output ends of the control unit and the voltage conversion unit respectively, the output end of the optical coupling driving module is electrically connected with the control end of the zero-crossing trigger module, the input end of the zero-crossing trigger module is electrically connected with the output end of the voltage conversion unit, and the output end of the zero-crossing trigger module is in series connection with the corresponding first heating pipe at one end of the power supply end; the control unit outputs a control signal according to the set heating mode and the collected voltage signal of the power supply end, drives the optical coupling driving module, and controls the working state of the zero-crossing trigger module.

[0008] Further, the zero-crossing detection switch unit comprises a zero-crossing detection module and a signal shaping module.

[0009] The input end of the zero-crossing detection module is electrically connected with the power supply end for collecting the voltage signal of the power supply end; the output end of the zero-crossing detection module is electrically connected with the input end of the signal shaping module and the output end of the voltage conversion unit respectively, the signal shaping module is electrically connected with the output end of the voltage conversion unit, and the output end of the signal shaping module is electrically connected with the control unit for converting the input waveform of the power supply end into a square wave for the control unit to recognize.

[0010] Further, it further comprises a second heating unit and a plurality of relay driving units, and the second heating unit comprises at least one second heating pipe.

[0011] The relay driving units are electrically connected with the output ends of the control unit and the voltage conversion unit respectively, and the two ends of the second heating pipe are respectively electrically connected with one end of the power supply end and the corresponding relay driving unit.

[0012] Further, it further comprises a current collection unit, and the zero-crossing trigger module and the relay driving unit are respectively provided with current sampling points, and the current collection unit is electrically connected with the output ends of the control unit and the voltage conversion unit and the current sampling points.

[0013] Further, it further comprises a communication unit, and the communication unit is electrically connected with the output ends of the control unit and the voltage conversion unit.

[0014] Further, the zero-crossing detection module comprises a first optical coupling, a first diode, a second diode, a third diode, a first resistor, a second resistor, and a third resistor, and the signal shaping module comprises a first switch tube, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a first capacitor.

[0015] One end of the emitting end of the first optocoupler is electrically connected with one end of the power supply end through a first resistor, the other end of the emitting end of the first optocoupler is electrically connected with the other end of the power supply end in sequence through a second resistor, a first diode and a power supply end, the emitting end and the receiving end of the first optocoupler are respectively connected with a second diode and a third diode in parallel, one end of the receiving end of the first optocoupler is electrically connected with the output end of the voltage conversion unit through a third resistor, the other end of the receiving end of the first optocoupler is electrically connected with the control end of the first switch tube through a fourth resistor, the control end of the first switch tube is connected with the first end of the first switch tube in sequence through a fifth resistor, the first end of the first switch tube is grounded, the second end of the first switch tube is electrically connected with the control unit in sequence through a sixth resistor and a seventh resistor, the connecting point of the sixth resistor and the seventh resistor is connected with the output end of the voltage conversion unit through an eighth resistor, and the connecting point of the sixth resistor and the seventh resistor is connected with the ground end through a first capacitor.

[0016] Further, the optocoupler driving module comprises a second optocoupler, a ninth resistor, a tenth resistor and an eleventh resistor, and the zero-crossing trigger module comprises a bidirectional thyristor.

[0017] One end of the emitting end of the second optocoupler is electrically connected with the control unit through the ninth resistor, the other end of the emitting end of the second optocoupler is electrically connected with the output end of the voltage conversion unit and one end of the tenth resistor respectively, the other end of the tenth resistor is electrically connected with one end of the ninth resistor, one end of the receiving end of the second optocoupler is electrically connected with the control end of the bidirectional thyristor through the eleventh resistor, one end of the receiving end of the second optocoupler is electrically connected with the output end of the voltage conversion unit, the other end of the receiving end of the second optocoupler is grounded, and one end of the bidirectional thyristor is connected with one end of the power supply end in sequence through a corresponding first heating tube.

[0018] The filter module is arranged between the two ends of the bidirectional thyristor, between one end of the receiving end of the second optocoupler and the output end of the voltage conversion unit, and between the other end of the receiving end of the second optocoupler and the ground end.

[0019] Further, the current collection unit comprises a voltage reduction module, a twelfth resistor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor.

[0020] The input end of the voltage reduction module is electrically connected with the current sampling point of the zero-crossing trigger module and the current sampling point of the relay driving unit respectively, the output end of the voltage reduction module is electrically connected with the control unit through the twelfth resistor, one end of the twelfth resistor is connected with the ground end through the second capacitor, the output end of the voltage reduction module is electrically connected with the output end of the voltage conversion unit, and the output end of the voltage reduction module is connected with the ground end through the third capacitor, the fourth capacitor and the fifth capacitor which are connected in parallel.

[0021] The application also provides a heating control method, which is realized by using the heating control system and comprises the following steps:

[0022] determining whether the system enters a working state;

[0023] when the system enters the working state, detecting input current of the system;

[0024] when the input current of the system is detected to be in a set range, determining whether the system enters a heating mode, the heating mode including a first heating mode and a second heating mode;

[0025] when the system is detected to be set to the first heating mode, the control unit enters a first heating program;

[0026] the control unit determines whether a voltage signal is zero-crossed;

[0027] when the zero-crossing detection module detects that the voltage is zero-crossed, the control unit outputs a first control signal to all the wavelet control driving units;

[0028] the wavelet driving control unit controls all the first heating tubes to work at a first output power in the form of wavelet control in a set heating period according to the first control signal;

[0029] when the system is detected to be set to the second heating mode, the control unit enters a second heating program;

[0030] the control unit outputs a second control signal to a plurality of set wavelet control driving units;

[0031] the wavelet driving control unit controls the set first heating tubes to work at a second output power according to the second control signal.

[0032] Further, the wavelet control includes the following steps:

[0033] the control unit controls all the zero-crossing trigger modules to be turned on in a first set number of complete waveform periods, and then controls all the zero-crossing trigger modules to be turned off in a second set number of complete waveform periods.

[0034] Further, the heating mode further includes a third heating mode:

[0035] when determining whether the system enters the heating mode, the control method further includes the following steps:

[0036] when the system is detected to be set to the third heating mode, the control unit enters a third heating program;

[0037] the control unit outputs a third control signal to all the relay driving units;

[0038] the relay driving unit controls all the second heating tubes to work at a third output power according to the third control signal.

[0039] Further, after the wave loss driving control unit controls all the first heating pipes to work at the first output power in the form of wave loss control within the set heating period according to the first control signal, the method further comprises the following steps:

[0040] determining whether the current temperature reaches the first set temperature;

[0041] if the current temperature reaches the first set temperature, completing the heating, otherwise, prompting an alarm;

[0042] determining whether the current temperature is less than or equal to the temperature threshold value;

[0043] if the current temperature is less than or equal to the temperature threshold value, re-entering the first heating program.

[0044] Further, after the wave loss driving control unit controls all the first heating pipes to work at the first output power in the form of wave loss control within the set heating period according to the first control signal, the method further comprises the following steps:

[0045] determining whether the current temperature reaches the first set temperature;

[0046] if the current temperature reaches the first set temperature, completing the heating, otherwise, prompting an alarm;

[0047] if the current temperature reaches the first set temperature, completing the heating, otherwise, prompting an alarm;

[0048] determining whether the current temperature is less than or equal to the temperature threshold value;

[0049] if the current temperature is less than or equal to the temperature threshold value, re-entering the first heating program.

[0050] The heating control system and the control method thereof provided by the application can determine whether to drive the first heating pipe through wave loss control according to the set heating mode and the voltage signal of the power supply end collected by the zero-crossing detection switch unit, thereby realizing the control of the working state of the zero-crossing trigger module, avoiding the generation of electromagnetic interference during wave loss control, enabling high-speed response, and realizing fine power control of multiple first heating pipes, matching different heating modes, and making the barbecue experience better.

[0051] The synchronous clock is provided through the zero-crossing detection module, so that the lost wave control driving unit completes the switching operation at the zero-crossing point, and the signal shaping module converts the input waveform of the power supply end into a clean and stable square wave, so as to ensure the signal quality. The filter module is used for filtering out the noise, for inhibiting the voltage peak, preventing the over-zero trigger module from being mis-triggered, and improving the anti-interference ability of the system, so that the control unit can accurately identify and process, and the stability of the circuit is improved.

[0052] The relay driving circuit is used for controlling the starting and disconnecting of the second heating pipe in the second heating unit, and is complementary to the fine power control mode of the first heating unit, so that more power gears can be combined.

[0053] The input current of the system is monitored before heating, and the temperature is monitored in real time during heating, so that accurate temperature control is realized, the heating is stopped as soon as the first set temperature is reached, the continuous waste of energy is avoided, the energy-saving effect is improved, the system is prevented from malfunctioning due to overheating, and the safety and reliability of the system are improved. After heating is completed, the temperature can be automatically maintained, and once the temperature drops to the temperature threshold, the heating is restarted, so that the system automatically maintains the temperature in the set range, and the use is more convenient.

[0054] In the second heating mode and the third heating mode, the temperature change difference is monitored first, so that the abnormal situation of temperature change can be quickly identified. Since the rated output power is used for heating in the two modes, the heating speed is faster, so that the control mode avoids long-time operation in the fault state, and the safety is greatly enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 The heating control method flow chart provided for the embodiment of the application;

[0056] Figure 2 The structure principle block diagram of the heating control system provided for the embodiment of the application;

[0057] Figure 3 For Figure 2 The circuit schematic diagram of the medium voltage conversion unit;

[0058] Figure 4 For Figure 2 The circuit schematic diagram of the input unit, the communication unit and the control unit;

[0059] Figure 5 For Figure 2 The circuit schematic diagram of the relay driving unit and the lost wave control driving unit;

[0060] Figure 6 For Figure 2Circuit schematic view of zero-crossing detection switch unit and current collection unit;

[0061] Figure 7 For Figure 6 Voltage waveform schematic view of first heating pipe;

[0062] Figure 8 For Figure 2 Structure schematic view of oven.

[0063] Fig. 1, first heating unit; 2, zero-crossing detection switch unit; 21, zero-crossing detection module, 22, signal shaping module, 3, wave loss control driving unit; 31, optocoupler driving module, 32, zero-crossing trigger module, 33, filter module, 4, control unit, 5, input unit, 6, voltage conversion unit; 7, first heating pipe, 8, second heating unit, 9, relay driving unit, 10, second heating pipe, 11, current collection unit, 12, communication unit, 13, first temperature collection unit, 14, second temperature collection unit, 15, silica gel sleeve, 16, protective mesh cover, 100, power supply end, 200, oven body. DETAILED DESCRIPTION

[0064] In order to make the person skilled in the art better understand the present application, so that the scope of the present application is more clearly defined, the present application is described in detail below according to some specific embodiments of the present application. It should be noted that the following is only some specific embodiments of the concept of the present application and is only one embodiment of the present application, and the specific and direct description of the related structure is only for the convenience of understanding the present application, and each specific feature does not of course, directly limit the scope of the present application.

[0065] Example one:

[0066] Referring to the accompanying Figure 2 As shown in the drawings, the present application adopts the following technical scheme, a heating control system applied to an oven, comprising a first heating unit 1, a zero-crossing detection switch unit 2 for collecting voltage signals of a power supply end 100, a plurality of wave loss control driving units 3, a control unit 4, an input unit 5 for setting working mode and heating mode, and a voltage conversion unit 6, the first heating unit 1 comprises at least two first heating pipes 7, and the first heating pipe 7 corresponds to the wave loss control driving unit 3 one by one. In this embodiment, the first heating pipe 7 is provided with four, which can be adjusted according to actual needs.

[0067] The input end of the wave loss control driving unit 3, the output end of the zero-crossing detection switch unit 2, the output end of the voltage conversion unit 6 and the input unit 5 are electrically connected with the control unit 4, the input end of the voltage conversion unit 6 and the input end of the zero-crossing detection switch unit 2 are electrically connected with the power supply end 100, the output end of the wave loss control driving unit 3 and one end of the power supply end are respectively connected with two ends of the corresponding first heating pipe 7, and the zero-crossing detection switch unit 2, the wave loss control driving unit 3 and the input unit 5 are electrically connected with the output end of the voltage conversion unit 6.

[0068] The wave loss control driving unit 3 comprises an optical coupling driving module 31 and a zero-crossing trigger module 32, the input end of the optical coupling driving module 31 is electrically connected with the control unit 4 and the output end of the voltage conversion unit 6, the output end of the optical coupling driving module 31 is electrically connected with the control end of the zero-crossing trigger module 32, the input end of the zero-crossing trigger module 32 is electrically connected with the output end of the voltage conversion unit 6, the output end of the zero-crossing trigger module 32 is connected in series with the corresponding first heating pipe 7 at one end (i.e. the zero line) of the power supply end 100, and the zero-crossing trigger module 32 is provided with a current sampling point; the control unit 4 outputs a control signal according to the set heating mode and the collected voltage signal of the power supply end 100, drives the optical coupling driving module 31, and controls the working state of the zero-crossing trigger module 32.

[0069] As shown in Figure 5 The optical coupling driving module 31 comprises a second optical coupling U1, a ninth resistor R20, a tenth resistor R17 and an eleventh resistor R18, and the zero-crossing trigger module 32 comprises a bidirectional thyristor Q3; one end of the emitting end of the second optical coupling U1 is electrically connected with the control unit 4 through the ninth resistor R20, the other end of the emitting end of the second optical coupling U1 is electrically connected with the output end of the voltage conversion unit 6 and one end of the tenth resistor R17, the other end of the tenth resistor R17 is electrically connected with one end of the ninth resistor R20, one end of the receiving end of the second optical coupling U1 is electrically connected with the control end of the bidirectional thyristor Q3 through the eleventh resistor R18, one end of the receiving end of the second optical coupling U1 is electrically connected with the output end of the voltage conversion unit 6, the other end of the receiving end of the second optical coupling U1 is grounded, the corresponding first heating pipe 7 is connected in series between one end of the bidirectional thyristor Q3 and one end of the power supply end 100 (i.e. the zero line), and the other end of the bidirectional thyristor Q3 is the current sampling point of the zero-crossing trigger module 32.

[0070] The filter module 33 is arranged between the two ends of the bidirectional thyristor Q3, between one end of the receiving end of the second optical coupling U1 and the output end of the voltage conversion unit 6, and between the other end of the receiving end of the second optical coupling U1 and the ground end.

[0071] As shown in Figure 6As shown, the zero-crossing detection switch unit 2 comprises a zero-crossing detection module 21 and a signal shaping module 22. The input end of the zero-crossing detection module 21 is electrically connected to both ends of the power supply end 100 for collecting the voltage signal of the power supply end 100. The output end of the zero-crossing detection module 21 is electrically connected to the input end of the signal shaping module 22 and the output end of the voltage conversion unit 6 respectively. The signal shaping module 22 is electrically connected to the output end of the voltage conversion unit 6. The output end of the signal shaping module 22 is electrically connected to the control unit 4. The power supply end 100 is an alternating current power supply, and the corresponding input waveform is a sine wave.

[0072] As shown in the figure, Figure 6 The zero-crossing detection module 21 comprises a first optocoupler U2, a first diode D10, a second diode D9, a third diode D15, a first resistor R30, a second resistor R39, and a third resistor R31. The signal shaping module 22 comprises a first switch tube Q6, a fourth resistor R34, a fifth resistor R35, a sixth resistor R27, a seventh resistor R28, an eighth resistor R25, and a first capacitor C14.

[0073] One end of the emitting end of the first optocoupler U2 is electrically connected to one end of the power supply end 100 through the first resistor R30. The other end of the emitting end of the first optocoupler U2 is electrically connected to the other end of the power supply end 100 in series with the second resistor R39 and the first diode D10. The emitting end and the receiving end of the first optocoupler U2 are connected in parallel with the second diode D9 and the third diode D15 respectively. One end of the receiving end of the first optocoupler U2 is electrically connected to the output end of the voltage conversion unit 6 through the third resistor R31. The other end of the receiving end of the first optocoupler U2 is electrically connected to the control end of the first switch tube Q6 through the fourth resistor R34. The control end of the first switch tube Q6 is connected in series with the fifth resistor R35 between the first end thereof. The first end of the first switch tube Q6 is grounded. The second end of the first switch tube Q6 is electrically connected to the control unit 4 in series with the sixth resistor R27 and the seventh resistor R28. The connection point of the sixth resistor R27 and the seventh resistor R28 is connected in series with the eighth resistor R25 between the output end of the voltage conversion unit 6 and the ground end. The connection point of the sixth resistor R27 and the seventh resistor R28 is connected in series with the first capacitor C14. The signal output by the first optocoupler U2 is inverted and shaped by the signal shaping module 22, which is used to convert the input waveform of the power supply end 100 into a pure and steep square wave synchronized with the zero-crossing of the alternating current for the control unit 4 to identify. The square wave signal jumps every time the alternating current power supply crosses zero.

[0074] The control system further comprises a second heating unit 8 and a plurality of relay driving units 9. The second heating unit 8 comprises at least one second heating pipe 10. The relay driving units 9 are electrically connected to the control unit 4 and the output end of the voltage conversion unit 6 respectively. The two ends of the second heating pipe 10 are electrically connected to one end of the power supply end 100 and the corresponding relay driving unit 9 respectively. The relay driving unit 9 is provided with a current sampling point.

[0075] like Figure 5 As shown, the relay drive unit 9 includes a second switch Q1, a relay J1, a fourth diode D3, a thirteenth resistor R9, and a fourteenth resistor R12. The control terminal of the second switch Q1 is electrically connected to the control unit 4 through the thirteenth resistor R9. The fourteenth resistor R12 is connected in series between the control terminal of the second switch Q1 and its first terminal. The first terminal of the second switch Q1 is grounded. The coil of the relay J1 is connected in series between the second terminal of the second switch Q1 and the output terminal of the voltage conversion unit 6. The fourth diode D3 is connected in parallel across the two ends of the coil of the relay J1. The stationary contact of the relay J1 is the current sampling point of the relay drive unit 9. One of the moving contacts of the relay J1 is electrically connected to one end of the corresponding second heating tube 10. This is suitable for load scenarios that require control of large currents and have high safety isolation requirements.

[0076] The input unit 5 can be implemented using a button input module, a touch screen, or other means. Users can select different heating modes by pressing buttons or touch screen buttons. The heating modes include the first heating mode, the second heating mode, and the third heating mode. The control unit 4 identifies the heating mode according to the different addresses corresponding to different buttons.

[0077] When the control unit 4 detects that the input unit 5 is set to the first heating mode, the control unit 4 reads the voltage signal sent by the zero-crossing detection module 21. When the voltage crosses zero, the control unit 4 outputs a first control signal to all the waveform dropping control drive units 3, causing the zero-crossing trigger module 32 to conduct when the voltage crosses zero, maintaining the conduction state for several complete waveforms, and then turning it off when the voltage crosses zero, maintaining the off state for several complete waveforms. By controlling the ratio of the conduction time to the off time, the output power can be adjusted. In this application, the conduction time and the off time are equal. For example, if the rated output power of the first heating tube 7 is 1200W, after waveform dropping control, the four first heating tubes 7 operate at 600W within the control cycle, and the total output power is 2400W.

[0078] When the control unit 4 detects that the input unit 5 is set to the second heating mode, the control unit 4 outputs a second control signal to a set number of wave drop control drive units 3, ensuring that the corresponding zero-crossing trigger module 32 remains in the on state. For example, after zone control, only two first heating tubes 7 operate at 1200W, with a total output power of 2400W. Compared to operating all four first heating tubes 7 at half power simultaneously, this effectively reduces heating time, increases thermal efficiency, and provides a better grilling experience. Furthermore, the lower output power during full-zone heating reduces the requirements for the power cord, making it suitable for different regional usage needs.

[0079] When entering the second heating mode, the control unit 4 is unaffected by the voltage signal collected by the zero-crossing detection module 21, and continuously outputs a high level to the set wave dropping control drive unit 3. During wave dropping control, the control unit 4 alternately outputs high and low levels to the set wave dropping control drive unit 3.

[0080] When the control unit 4 recognizes that the input unit 5 is set to the third heating mode, the control unit 2 outputs the third control signal to the control terminal of the second switch tube Q1 in the relay drive unit 9, so that it is saturated and turned on, and then the relay J1 is energized, driving the second heating tube 10 to work with the third output power.

[0081] The control system also includes a current acquisition unit 11, which is electrically connected to the output terminals of the control unit 4 and the voltage conversion unit 6, the current sampling point of the zero-crossing trigger module 32, and the current sampling point of the relay drive unit 9.

[0082] like Figure 6 As shown, the current acquisition unit 11 includes a step-down module U9, a twelfth resistor R92, a second capacitor C43, a third capacitor C40, a fourth capacitor C41, and a fifth capacitor C42. The input terminal of the step-down module U9 is electrically connected to the current sampling point of the zero-crossing trigger module 32 and the current sampling point of the relay drive unit 9, respectively. The output terminal of the step-down module U9 is electrically connected to the control unit 4 through the twelfth resistor R92. One end of the twelfth resistor R92 is connected in series with the second capacitor C43 to the ground terminal. The output terminal of the step-down module U9 is electrically connected to the output terminal of the voltage conversion unit 6. The third capacitor C40, the fourth capacitor C41, and the fifth capacitor C42 are connected in parallel in series between the output terminal of the step-down module U9 and the ground terminal.

[0083] By acquiring the current signal flowing through relay J1 and bidirectional thyristor Q3, the step-down module U9 proportionally reduces the large current signal for circuit breaker detection and overcurrent protection, thereby improving the safety of the system. Multiple capacitors form a filter network to filter out ripple and high-frequency noise, improving sampling accuracy.

[0084] In some embodiments, the control system further includes a current acquisition module for acquiring the system input current.

[0085] The control system also includes a communication unit 12, which is electrically connected to the output terminals of the control unit 4 and the voltage conversion unit 6, respectively. Figure 3 As shown, the communication unit 12 is implemented using a Bluetooth module for information interaction with external devices (such as mobile apps, cloud platforms, etc.), allowing the external devices to issue control commands to remotely control the heating mode. In another embodiment, the communication unit 12 can also be implemented using Wi-Fi.

[0086] The control system also includes a temperature acquisition unit and a display unit. The temperature acquisition unit includes a first temperature acquisition unit 13 and a second temperature acquisition unit 14. The first temperature acquisition unit 13 and the second temperature acquisition unit 14 are electrically connected to the output terminals of the control unit 4 and the voltage conversion unit 6, respectively. The first temperature acquisition unit 13 and the second temperature acquisition unit 14 use temperature probes to collect temperature information of the food and the furnace body, respectively, to achieve temperature protection.

[0087] like Figures 3-6 As shown, the input terminal of the voltage conversion unit 6 is electrically connected to the two ends of the power supply terminal 100. The voltage conversion unit 6 includes a first voltage terminal of 12VDC, a second voltage terminal of 5VDC, a third voltage terminal of 3.3VDC, and a fourth voltage terminal of 5V.

[0088] The first voltage terminal 12VDC of the voltage conversion unit 6 supplies power to the relay drive unit 9. The second voltage terminal 5VDC of the voltage conversion unit 6 supplies power to the optocoupler drive module 31, the current acquisition unit 11, the zero-crossing detection module 21, the signal shaping module 22, the input unit 5, the communication unit 12, the first temperature acquisition unit 13, the second temperature acquisition unit 14, and the control unit 4. The third voltage terminal 3.3VDC supplies power to the communication unit 12, and the fourth voltage terminal 5V supplies power to the zero-crossing trigger module 32.

[0089] like Figure 8 As shown, when the control system is applied to the oven, the oven includes an oven body 200 and the aforementioned control system. The first heating element 7 is a carbon fiber heating element with an alumina coating on its surface. The alumina coating protects and enhances infrared radiation, improving heating efficiency and reducing heat loss. The first heating element 7 works in conjunction with a reflector on the oven body 200 to generate heat more evenly, saving energy. The use of the carbon fiber heating element, combined with the heating control method of this application, enables more precise temperature control.

[0090] In this embodiment, silicone sleeves 15 are installed at both ends of the first heating tube 7. During installation, a protective mesh cover 16 is installed on the outside of the first heating tube 7 to reduce bumps and knocks during transportation and prevent damage.

[0091] like Figure 1 As shown, the present invention also provides a heating control method, which is implemented using the above-described heating control system. The control method includes the following steps:

[0092] Determine whether the system has entered the working state, that is, determine whether the system is powered on.

[0093] When the system enters the working state, it performs system input current detection to determine whether the mains power is properly connected.

[0094] If the system input current is detected to be within the set range, it is determined whether the system enters the heating mode. The heating modes include the first heating mode, the second heating mode, and the third heating mode. Otherwise, an alarm is issued. Specifically, when the control unit 4 detects that the system input current is outside the set range, the control unit 4 controls the display unit to display alarm information to prompt the user to turn off the heating.

[0095] When the control unit 4 detects that the system is set to the first heating mode, the control unit 4 enters the first heating program.

[0096] Control unit 4 determines whether the voltage signal has crossed zero. When the zero-crossing detection module 21 detects that the voltage has crossed zero, control unit 4 outputs the first control signal to all the waveform dropping control drive units 3.

[0097] The wave dropping drive control unit 3 controls all the first heating tubes 7 to operate at the first output power in the form of wave dropping control within the set heating cycle, according to the first control signal.

[0098] Preferably, the wave drop control includes the following steps:

[0099] Control unit 4 controls all zero-crossing trigger modules 32 to turn on within a first set number of complete waveform cycles, and then control unit 4 controls all zero-crossing trigger modules 32 to turn off within a second set number of complete waveform cycles.

[0100] In this embodiment, during wave drop control, all zero-crossing trigger modules 32 operate for four half-wave cycles, and then are turned off for four half-wave cycles, causing the first heating tube 7 to heat according to this operating mode. The voltage waveform of the first heating tube 7 is as follows: Figure 7 As shown.

[0101] Control unit 4 determines whether the current temperature of the oven body has reached the first set temperature. If the current temperature of the oven body has reached the first set temperature, heating is completed; otherwise, an alarm is issued.

[0102] Control unit 4 determines whether the current temperature of the oven body is less than or equal to a temperature threshold. If the current temperature of the oven body is less than or equal to the temperature threshold, it re-enters the first heating program. The temperature threshold is less than the first set temperature.

[0103] When the control unit 4 detects that the system is set to the second heating mode, the control unit 4 enters the second heating program.

[0104] The control unit 4 outputs a second control signal to several preset wave dropping control drive units 3.

[0105] The wave-dropping drive control unit 3 controls the first heating tube 7 to operate at the second output power according to the second control signal.

[0106] Control unit 4 determines whether the current temperature change difference of the oven body is within the set range. If the current temperature change difference of the oven body is within the set range, it determines whether the current temperature has reached the first set temperature; otherwise, it issues an alarm.

[0107] If the oven body reaches the first set temperature, heating will be completed; otherwise, an alarm will be issued.

[0108] Control unit 4 determines whether the current temperature of the oven body is less than or equal to a temperature threshold. If the current temperature of the oven body is less than or equal to the temperature threshold, control unit 4 enters the second heating program. The temperature threshold is less than the first set temperature.

[0109] Preferably, when the system is detected to be set to the third heating mode, the control unit 4 enters the third heating program.

[0110] The control unit 4 outputs a third control signal to all relay drive units 9.

[0111] The relay drive unit 9 controls all the second heating tubes 10 to operate at the third output power according to the third control signal.

[0112] Control unit 4 determines whether the current temperature change difference of the oven body is within the set range. If the current temperature change difference of the oven body is within the set range, it determines whether the current temperature of the oven body has reached the first set temperature; otherwise, it issues an alarm.

[0113] If the oven body reaches the first set temperature, heating will be completed; otherwise, an alarm will be issued.

[0114] Control unit 4 determines whether the current temperature of the oven body is less than or equal to a temperature threshold. If the current temperature of the oven body is less than or equal to the temperature threshold, it re-enters the corresponding heating program according to the currently set heating mode. The temperature threshold is less than the first set temperature. The first set temperature and temperature threshold for various heating modes can be set to be the same or different.

[0115] The above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A heating control system, characterized in that: It includes a first heating unit (1), a zero-crossing detection switch unit (2) for collecting voltage signals from the power supply terminal (100), several loss control drive units (3), a control unit (4), an input unit (5) for setting at least a heating mode, and a voltage conversion unit (6). The first heating unit (1) includes at least two first heating tubes (7), and the first heating tubes (7) correspond one-to-one with the loss control drive units (3). The input terminal of the wave drop control drive unit (3), the output terminal of the zero-crossing detection switch unit (2), the output terminal of the voltage conversion unit (6), and the input unit (5) are electrically connected to the control unit (4), respectively. The input terminal of the voltage conversion unit (6) and the input terminal of the zero-crossing detection switch unit (2) are electrically connected to the power supply terminal (100). The output terminal of the wave drop control drive unit (3) and one end of the power supply terminal (100) are respectively connected to the two ends of the corresponding first heating tube (7). The zero-crossing detection switch unit (2), the wave drop control drive unit (3), and the input unit (5) are respectively electrically connected to the output terminal of the voltage conversion unit (6). The wave drop control drive unit (3) includes an optocoupler drive module (31) and a zero-crossing trigger module (32). The input terminal of the optocoupler drive module (31) is electrically connected to the output terminal of the control unit (4) and the voltage conversion unit (6), respectively. The output terminal of the optocoupler drive module (31) is electrically connected to the control terminal of the zero-crossing trigger module (32). The input terminal of the zero-crossing trigger module (32) is electrically connected to the output terminal of the voltage conversion unit (6). The output terminal of the zero-crossing trigger module (32) is connected in series with one end of the power supply terminal (100) to the corresponding first heating tube (7). The control unit (4) outputs a control signal according to the set heating mode and the collected voltage signal of the power supply terminal (100), which is driven by the optocoupler drive module (31) to control the working state of the zero-crossing trigger module (32).

2. The heating control system as described in claim 1, characterized in that: The zero-crossing detection switch unit (2) includes a zero-crossing detection module (21) and a signal shaping module (22); The input terminal of the zero-crossing detection module (21) is electrically connected to the power supply terminal (100) and is used to collect the voltage signal of the power supply terminal (100). The output terminal of the zero-crossing detection module (21) is electrically connected to the input terminal of the signal shaping module (22) and the output terminal of the voltage conversion unit (6). The signal shaping module (22) is electrically connected to the output terminal of the voltage conversion unit (6). The output terminal of the signal shaping module (22) is electrically connected to the control unit (4) and is used to convert the input waveform of the power supply terminal (100) into a square wave for the control unit (4) to recognize.

3. The heating control system as described in claim 1, characterized in that: It also includes a second heating unit (8) and several relay drive units (9), wherein the second heating unit (8) includes at least one second heating tube (10); The relay drive unit (9) is electrically connected to the output terminals of the control unit (4) and the voltage conversion unit (6), respectively. The two ends of the second heating tube (10) are electrically connected to one end of the power supply terminal (100) and the corresponding relay drive unit (9), respectively.

4. The heating control system as described in claim 3, characterized in that: It also includes a current acquisition unit (11), the zero-crossing trigger module (32) and the relay drive unit (9) are respectively provided with current sampling points, and the current acquisition unit (11) is electrically connected to the output terminal of the control unit (4) and the voltage conversion unit (6) and the current sampling point respectively.

5. The heating control system as described in claim 1, characterized in that: It also includes a temperature acquisition unit, which is electrically connected to the output terminals of the control unit (4) and the voltage conversion unit (6).

6. A heating control method, implemented using the heating control system as described in any one of claims 1-5, characterized in that, The control method includes the following steps: Determine if the system has entered a working state; When the system enters the working state, the system input current is detected; If the system input current is detected to be within the set range, it is determined whether the system enters the heating mode, which includes a first heating mode and a second heating mode. When the system is detected to be set to the first heating mode, the control unit (4) enters the first heating program; The control unit (4) determines whether the voltage signal has crossed zero; When the zero-crossing detection module (21) detects that the voltage has crossed zero, the control unit (4) outputs the first control signal to all the loss control drive units (3); The wave dropping drive control unit (3) controls all the first heating tubes (7) to operate at the first output power in the form of wave dropping control within the set heating cycle according to the first control signal; When the system is detected to be set to the second heating mode, the control unit (4) enters the second heating program; The control unit (4) outputs a second control signal to a number of preset wave dropping control drive units (3); The wave-drop drive control unit (3) controls the set first heating tube (7) to operate at the second output power according to the second control signal.

7. The heating control method as described in claim 6, characterized in that: The aforementioned wave drop control includes the following steps: The control unit (4) controls all zero-crossing trigger modules (32) to be turned on within a first set number of complete waveform cycles, and then the control unit (4) controls all zero-crossing trigger modules (32) to be turned off within a second set number of complete waveform cycles.

8. The heating control method as described in claim 6, characterized in that: The heating mode also includes a third heating mode: When determining whether the system has entered heating mode, the control method further includes the following steps: When the system is detected to be set to the third heating mode, the control unit (4) enters the third heating program; The control unit (4) outputs a third control signal to all relay drive units (9); The relay drive unit (9) controls all the second heating tubes (10) to operate at the third output power according to the third control signal.

9. The heating control method according to any one of claims 6-8, characterized in that: After the wave dropping drive control unit (3) controls all the first heating tubes (7) to operate at the first output power in the form of wave dropping control within a set heating cycle according to the first control signal, the following steps are also included: Determine if the current temperature has reached the first set temperature; If the current temperature reaches the first set temperature, heating will be completed; otherwise, an alarm will be issued. Determine if the current temperature is less than or equal to a temperature threshold. If the current temperature is less than or equal to the temperature threshold, re-enter the first heating program.

10. The heating control method as described in claim 8, characterized in that: After the wave drop drive control unit (3) controls the set first heating tube (7) to operate at the second output power according to the second control signal; and after the relay drive unit (9) controls all the second heating tubes (10) to operate at the third output power according to the third control signal, the following steps are also included: Determine whether the current temperature change difference is within the set range; If the current temperature change difference is within the set range, determine whether the current temperature has reached the first set temperature; otherwise, issue an alarm. If the current temperature reaches the first set temperature, heating will be completed; otherwise, an alarm will be issued. Determine if the current temperature is less than or equal to a temperature threshold. If the current temperature is less than or equal to the temperature threshold, the corresponding heating program will be restarted according to the currently set heating mode.

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