Heating control method, heating circuit, and electrothermal device

Abstract

The application relates to a heating control method, a heating circuit and an electric heating device. In the process that a power supply unit supplies power to a resistive electric heating device through a voltage regulating unit, the system voltage at the output end of the power supply unit is detected to obtain a reference voltage value output by the voltage regulating unit when the system voltage reaches a preset safety condition, and then the output voltage of the voltage regulating unit is adjusted according to the reference voltage value to supply power to the resistive electric heating device. The system voltage at the output end of the power supply unit is monitored in real time, and the voltage output by the voltage regulating unit is adjusted in time when the system voltage reaches the preset safety condition, so that serious voltage drop is avoided, the stability of the system voltage is ensured, the stable work of the heating circuit is realized, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and in particular to a heating control method, a heating circuit, and an electric heating device. Background Technology

[0002] Electric heating devices are those that convert electrical energy into heat energy using an internal heating circuit. Common examples in daily life include thermos kettles, induction cookers, and breast pump heating elements.

[0003] In traditional technologies, heating circuits typically include batteries and resistive heating devices, such as PI (polyimide) heating films, graphene heating films, and resistance wires. The batteries supply power to the resistive heating devices, which then convert electrical energy into heat energy, thus achieving electrothermal conversion.

[0004] However, the heating circuit inside the electric heating device in traditional technology generates a large voltage drop during the heating process, which cannot guarantee the stability of the system power supply of the electric heating device. Summary of the Invention

[0005] Therefore, it is necessary to provide a heating control method, a heating circuit, and an electric heating device to address the aforementioned technical problems.

[0006] In a first aspect, this application provides a heating control method, including:

[0007] During the process of the power supply unit supplying power to the resistive heating device through the voltage regulation unit, the system voltage at the output terminal of the power supply unit at the current moment is detected;

[0008] Obtain the reference voltage value output by the voltage regulation unit when the system voltage reaches the preset safety condition;

[0009] The output voltage of the voltage regulation unit is adjusted according to the reference voltage value to supply power to the resistive heating device.

[0010] In one embodiment, the method further includes:

[0011] Determine whether the system voltage is less than or equal to the preset safe voltage threshold;

[0012] If so, confirm that the system voltage has reached the preset safety conditions.

[0013] In one embodiment, adjusting the output voltage of the voltage regulation unit according to a reference voltage value includes:

[0014] Obtain the temperature range where the current temperature value of the resistive heating element is located;

[0015] The output voltage of the voltage regulation unit is adjusted according to the temperature range and the reference voltage value.

[0016] In one embodiment, obtaining the temperature range of the current temperature value of the resistive heating device includes:

[0017] Obtain the current temperature value of the resistive heating element;

[0018] If the current temperature value is lower than the preset temperature threshold, the temperature range is determined to be the low temperature zone.

[0019] If the current temperature value is greater than the preset temperature threshold but less than the target temperature threshold, the temperature range is determined to be a high-temperature zone.

[0020] If the current temperature value is equal to or greater than the target temperature threshold, the temperature range is determined to be a constant temperature zone.

[0021] In one embodiment, adjusting the output voltage of the voltage regulation unit according to the temperature range and a reference voltage value includes:

[0022] If the temperature range is a low temperature range, the output voltage of the voltage regulation unit will be the reference voltage value.

[0023] If the temperature range is a high-temperature range, the output voltage of the voltage regulation unit will be reduced from the reference voltage value to the target voltage value using a preset voltage reduction method; the target voltage value is the voltage value when the current temperature value of the resistive heating element reaches the target temperature threshold.

[0024] If the temperature range is a constant temperature range, adjust the output voltage of the voltage regulation unit to the target voltage value.

[0025] In one embodiment, reducing the output voltage of the voltage regulation unit from a reference voltage value to a target voltage value using a preset step-down method includes:

[0026] The output voltage of the voltage regulation unit is reduced from the reference voltage value to the target voltage value by the same amount of voltage change; or,

[0027] First increase the voltage change, then decrease the voltage change to reduce the output voltage of the voltage regulation unit from the reference voltage value to the target voltage value.

[0028] In one embodiment, the process of the power supply unit supplying power to the resistive heating device through the voltage regulation unit includes:

[0029] The output voltage from the control voltage regulation unit to the resistive heating device increases linearly.

[0030] Secondly, this application also provides a heating circuit, including: a power supply unit, a control unit, a voltage monitoring unit, a voltage regulation unit, and a resistive heating device;

[0031] The power supply unit is connected to the control unit and the voltage regulation unit respectively; the control unit is connected to the voltage monitoring unit and the voltage regulation unit respectively; and the voltage regulation unit is connected to the resistive heating device.

[0032] The voltage monitoring unit is used to obtain the system voltage at the output of the power supply unit;

[0033] The control unit is used to obtain the reference voltage value output by the voltage regulation unit when the system voltage reaches a preset safety condition, and adjust the output voltage of the voltage regulation unit according to the reference voltage value to supply power to the resistive heating device.

[0034] In one embodiment, the heating circuit further includes a temperature sensor connected to the control unit, the temperature sensor being used to acquire the temperature of the resistive heating element;

[0035] The control unit is used to adjust the output voltage of the voltage regulating unit according to the temperature of the resistive heating device.

[0036] In one embodiment, the voltage regulation unit includes: an RC filter circuit, a voltage divider circuit, and a first power conversion circuit connected in series;

[0037] The RC filter circuit is connected to the control unit, and the first power conversion circuit is connected to the power supply unit.

[0038] In one embodiment, the power supply unit includes a charging circuit, a power supply battery, a system power supply, and a second power conversion circuit; wherein the charging circuit is connected to the power supply battery and the system power supply, the power supply battery is connected to the system power supply, the system power supply is connected to the voltage regulation unit, and is connected to the control unit through the second power conversion circuit.

[0039] Thirdly, this application also provides an electric heating device, including the heating circuit described in any of the preceding claims.

[0040] The aforementioned heating control method, heating circuit, and heating device, during the process of the power supply unit supplying power to the resistive heating device through the voltage regulation unit, detect the system voltage at the current output of the power supply unit to obtain a reference voltage value output by the voltage regulation unit when the system voltage reaches a preset safety condition. Then, based on the reference voltage value, the output voltage of the voltage regulation unit is adjusted to supply power to the resistive heating device. This achieves real-time monitoring of the system voltage at the output of the power supply unit and timely adjustment of the voltage output of the voltage regulation unit when the system voltage reaches the preset safety condition, avoiding severe voltage drops, ensuring system voltage stability, and thus achieving stable operation of the heating circuit and extending its service life. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the topology of the heating circuit in one embodiment;

[0042] Figure 2 This is a flowchart illustrating a heating control method in one embodiment;

[0043] Figure 3 This is a flowchart illustrating the heating control method in another embodiment;

[0044] Figure 4 This is a schematic diagram of the topology of the heating circuit in another embodiment;

[0045] Figure 5 This is a schematic diagram of the process for adjusting the output voltage in one embodiment;

[0046] Figure 6 This is a schematic diagram illustrating the relationship between temperature and voltage changes in one embodiment;

[0047] Figure 7 This is a flowchart illustrating the process of determining the temperature region corresponding to a resistive heating device in one embodiment.

[0048] Figure 8 This is a schematic diagram of the process for adjusting the output voltage in another embodiment;

[0049] Figure 9 This is a schematic diagram of the heating circuit in another embodiment. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0051] The heating control method provided in this application embodiment can be applied to, for example... Figure 1 The heating circuit shown includes a power supply unit 101, a control unit 102, a voltage monitoring unit 103, a voltage regulation unit 104, and a resistive heating element 105. During the process of the power supply unit 101 supplying power to the resistive heating element 105 through the voltage regulation unit 104, the voltage monitoring unit 103 detects the system voltage at the output of the power supply unit 101 at the current moment, and obtains a reference voltage value output by the voltage regulation unit 104 when the system voltage reaches a preset safety condition. The control unit 102 then adjusts the output voltage of the voltage regulation unit 104 according to the reference voltage value to supply power to the resistive heating element 105.

[0052] In one embodiment, such as Figure 2 As shown, a heating control method is provided, which can be applied to heating control applications. Figure 1 The following steps are used as an example to illustrate the process: (Take control unit 102 as an example)

[0053] S210. During the process of the power supply unit supplying power to the resistive heating device through the voltage regulation unit, the system voltage at the output terminal of the power supply unit at the current moment is detected.

[0054] The power supply unit 101 supplies power to the control unit 102 and also supplies power to the resistive heating element 105 via the voltage regulation unit 104, so that the resistive heating element 105 can perform electrothermal conversion to achieve heating. The voltage monitoring unit 103 detects the system voltage at the output terminal of the power supply unit 101 and feeds the detection result back to the control unit 102.

[0055] It should be noted that during normal operation of the heating circuit, the output voltage of the voltage regulating unit 104 (outputting to the resistive heating device 105) gradually increases from a minimum voltage value Vmin to a preset voltage value V. The preset voltage value V can be the maximum voltage value Vmax that the power supply unit 101 can provide, or any fixed value between Vmin and Vmax. As the output voltage of the voltage regulating unit 104 gradually increases, the load power of the resistive heating device 105 increases accordingly, the internal resistance of the power supply unit 101 increases, causing the system voltage Vsys at the output of the power supply unit 101 to continuously decrease.

[0056] Optionally, during the process of the power supply unit 101 supplying power to the resistive heating device 105 through the voltage regulation unit 104, the control unit 102 can detect the system voltage Vsys at the output terminal of the power supply unit 101 at the current moment through the voltage monitoring unit 103.

[0057] S220. Obtain the reference voltage value output by the voltage regulation unit when the system voltage reaches the preset safety condition.

[0058] The aforementioned preset safety conditions are the limiting conditions to ensure the stable operation of the entire heating circuit. When the system voltage Vsys reaches this preset safety condition, it indicates that the entire heating circuit is about to become unstable or has already become unstable.

[0059] Optionally, after obtaining the system voltage Vsys, the control unit 102 further determines whether the system voltage Vsys has reached the preset safety condition, and if it is determined that the system voltage Vsys has reached the preset safety condition, it obtains the reference voltage value Vo output by the voltage regulation unit 104 at this time.

[0060] S230. Adjust the output voltage of the voltage regulation unit according to the reference voltage value to supply power to the resistive heating device.

[0061] Optionally, when the system voltage Vsys reaches a preset safety condition, the control unit 102 adjusts the output voltage of the voltage regulation unit 104 according to the reference voltage value Vo output by the voltage regulation unit 104 at the current moment, so as to supply power to the resistive heating device 105.

[0062] Optionally, the control unit 102 may continue to use the reference voltage value Vo as the output voltage Vout to supply power to the resistive heating device 105; or it may use a voltage less than the reference voltage value Vo as the output voltage Vout to supply power to the resistive heating device 105.

[0063] In this embodiment, during the process of the power supply unit supplying power to the resistive heating device through the voltage regulation unit, the system voltage at the output terminal of the power supply unit is detected at the current moment to obtain the reference voltage value output by the voltage regulation unit when the system voltage reaches a preset safety condition. Then, the output voltage of the voltage regulation unit is adjusted according to the reference voltage value to supply power to the resistive heating device. This achieves real-time monitoring of the system voltage at the output terminal of the power supply unit and timely adjustment of the voltage output of the voltage regulation unit when the system voltage reaches the preset safety condition, avoiding severe voltage drops, ensuring system voltage stability, and thus achieving stable operation of the heating circuit and extending its service life.

[0064] For the system voltage Vsys, the aforementioned preset safety conditions are the safe voltage thresholds, such as... Figure 3 As shown, the above method also includes:

[0065] S310. Determine whether the system voltage is less than or equal to the preset safe voltage threshold.

[0066] The safe voltage threshold is the minimum voltage value that the system voltage Vsys is allowed to reach.

[0067] Specifically, the control unit 102 compares the system voltage Vsys with a preset safe voltage threshold to determine whether the system voltage Vsys is less than the preset safe voltage threshold, and then determines whether the system voltage Vsys has reached the preset safe condition.

[0068] S320. If so, confirm that the system voltage has reached the preset safety conditions.

[0069] Specifically, if the system voltage Vsys is less than or equal to the safe voltage threshold, then the system voltage Vsys is determined to have reached the preset safe condition; conversely, if the system voltage Vsys is greater than the safe voltage threshold, then the system voltage Vsys is determined to have not yet reached the preset safe condition.

[0070] It should be noted that, in this application, while the output voltage Vout from the voltage regulation unit 104 to the resistive heating device 105 is gradually increasing, the system voltage Vsys at the output terminal of the power supply unit 101 is monitored simultaneously to determine whether the system voltage Vsys has reached a preset safety condition. If the system voltage Vsys is less than or equal to the safety voltage threshold, it is determined that the system voltage Vsys has reached the preset safety condition, and the output voltage Vout of the voltage regulation unit 104 is adjusted accordingly to prevent the system voltage Vsys from decreasing further. If the system voltage Vsys is greater than the safety voltage threshold, it is determined that the system voltage Vsys has not yet reached the preset safety condition, and the output voltage Vout to the resistive heating device 105 can continue to increase until the output voltage Vout reaches the target voltage value, or the system voltage Vsys reaches the preset safety condition.

[0071] In this embodiment, the method further includes determining whether the system voltage is less than or equal to a preset safe voltage threshold. If so, the system voltage is determined to have reached the preset safe condition. This allows for targeted real-time monitoring of the system voltage at the output of the power supply unit, promptly detecting situations where the system voltage drops below the safe voltage threshold, and enabling timely adjustments to improve the timeliness of the adjustments.

[0072] In the actual operation of the heating circuit, it is necessary not only to control the output voltage Vout to the resistive heating element 105, but also to control the temperature of the resistive heating element 105, and then combine this with the output voltage Vout output to the resistive heating element 105 by the temperature control voltage adjustment unit 104. Accordingly, as... Figure 4 As shown, the heating circuit also includes a temperature sensor 106 connected to the control unit 102 to obtain the temperature of the resistive heating element 105. Based on this, as Figure 5 As shown, the process of adjusting the output voltage of the voltage regulation unit according to the reference voltage value in S230 includes:

[0073] S510: Obtain the temperature range of the current temperature value of the resistive heating element.

[0074] Optionally, the control unit 102 can monitor the current temperature value of the resistive heating device 105 in real time through the temperature sensor 106, and then determine the temperature range corresponding to the current temperature value of the resistive heating device 105 according to the preset correspondence between the temperature value and the temperature range.

[0075] S520: Adjust the output voltage of the voltage regulation unit according to the temperature range and reference voltage value.

[0076] Optionally, after determining the temperature range corresponding to the current temperature value of the resistive heating device 105, the control unit 102 can adjust the output voltage Vout of the voltage regulation unit 104 together with the temperature range and the reference voltage value Vo.

[0077] To simplify the correspondence between temperature values ​​and temperature regions, such as Figure 6 As shown, the temperature region can be divided into a low-temperature region, a high-temperature region, and a constant-temperature region. In an optional embodiment, as... Figure 7 As shown, S410 above, obtaining the temperature range where the current temperature value of the resistive heating device is located, includes:

[0078] S710: Obtain the current temperature value of the resistive heating element.

[0079] Specifically, the control unit 102 obtains the current temperature value of the resistive heating device 105 at the current moment through the temperature sensor 106, and then determines the temperature range corresponding to the current temperature value of the resistive heating device 105 based on the current temperature value, a preset temperature threshold, and a target temperature threshold.

[0080] The target temperature threshold is the temperature value that the resistive heating device 105 is expected to reach, and the preset temperature threshold is any temperature value between the minimum temperature value (e.g., 0℃) and the target temperature threshold. For example, if the target temperature threshold is 100℃, the preset temperature threshold can be slightly lower than the target temperature threshold, such as 80℃.

[0081] S720. If the current temperature value is less than the preset temperature threshold, the temperature range is determined to be the low temperature range.

[0082] S730. If the current temperature value is greater than the preset temperature threshold but less than the target temperature threshold, the temperature region is determined to be a high temperature region.

[0083] S740. If the current temperature value is equal to or greater than the target temperature threshold, the temperature range is determined to be a constant temperature zone.

[0084] Specifically, the control unit 102 determines the target temperature to the corresponding temperature range by comparing the current temperature value of the resistive heating element 105 with the preset temperature threshold and the target temperature threshold. Specifically, if the current temperature value is less than the preset temperature threshold, the temperature range is determined to be a low-temperature range; if the current temperature value is greater than the preset temperature threshold but less than the target temperature threshold, the temperature range is determined to be a high-temperature range; and if the current temperature value is equal to or greater than the target temperature threshold, the temperature range is determined to be a constant-temperature range.

[0085] After determining the temperature range corresponding to the current temperature value of the resistive heating element 105, the output voltage Vout of the voltage regulation unit 104 can be adjusted based on this temperature range and the aforementioned reference voltage value Vo. For example... Figure 8As shown, the above-mentioned S420, which adjusts the output voltage of the voltage regulation unit according to the temperature range and the reference voltage value, includes:

[0086] S810. If the temperature range is a low temperature range, adjust the output voltage of the voltage regulation unit to the reference voltage value.

[0087] The low-temperature zone is the area where the temperature is below a preset temperature threshold. For example... Figure 6 As shown, the reference voltage value Vo is the output voltage Vout of the power supply unit 101 (output terminal) when the system voltage Vsys reaches the preset safety condition during the process of the voltage regulation unit 104 outputting a gradually increasing output voltage Vout to the resistive heating device 105.

[0088] Specifically, when the control unit 102 determines that the temperature range corresponding to the current temperature value of the resistive heating element 105 is a low-temperature zone, it gradually increases the output voltage Vout of the voltage regulation unit 104 to the reference voltage value Vo and then maintains it. This ensures system voltage stability while controlling the resistive heating element 105 to reach its maximum output power through the maximum output voltage, thereby causing the resistive heating element 105 to heat up rapidly.

[0089] S820. If the temperature range is a high-temperature range, the output voltage of the voltage regulation unit will be reduced from the reference voltage value to the target voltage value using a preset voltage reduction method. The target voltage value is the voltage value when the temperature of the resistive heating element reaches the target temperature threshold.

[0090] The high-temperature zone is the area where the temperature is greater than the preset temperature threshold but less than the target temperature threshold.

[0091] In an optional embodiment, the above-mentioned method of reducing the output voltage of the voltage regulation unit from the reference voltage value to the target voltage value using a preset step-down method includes:

[0092] The output voltage of the voltage regulation unit is reduced from the reference voltage value to the target voltage value by the same amount of voltage change, such as... Figure 6 The linear uniform voltage reduction shown is another approach. Alternatively, the voltage change can be increased first, then decreased to reduce the output voltage of the voltage regulation unit from the reference voltage value to the target voltage value, thus ensuring both rapid control and precise adjustment to the target voltage value.

[0093] Alternatively, the voltage can be reduced in a stepwise manner (e.g., reduced a little, held for a period of time, and then reduced a little more), or in a curved manner (e.g., the voltage reduction amount gradually decreases). In this embodiment, there are no specific restrictions on the voltage reduction method; as long as the voltage reduction is achieved, it is acceptable.

[0094] Specifically, when the control unit 102 determines that the temperature range corresponding to the current temperature value of the resistive heating element 105 is a high-temperature zone, it reduces the output voltage Vout of the voltage regulation unit 104 from the reference voltage value using a preset voltage reduction method until the current temperature value of the resistive heating element 105 reaches the target temperature. This is to control the resistive heating element 105 to reach the target temperature relatively accurately, avoiding the resistive heating element 105 heating up too quickly and failing to adjust its output power in time, which would cause the temperature of the resistive heating element 105 to exceed the target temperature by too much.

[0095] S830. If the temperature range is a constant temperature range, adjust the output voltage of the voltage regulation unit to the target voltage value.

[0096] The constant temperature zone is the area where the temperature reaches and remains at the target temperature.

[0097] Specifically, when the control unit 102 determines that the temperature range corresponding to the current temperature value of the resistive heating device 105 is a constant temperature range, it adjusts the output voltage Vout of the voltage regulation unit 104 to the target voltage value, that is, it maintains the current target voltage value continuously output, so as to control the current temperature value of the resistive heating device 105 to be maintained at the target temperature.

[0098] In this embodiment, the control unit obtains the temperature range of the current temperature value of the resistive heating element, and then adjusts the output voltage of the voltage regulation unit according to the temperature range and the reference voltage value. Specifically, when the temperature range is low, the output voltage of the voltage regulation unit is adjusted to the reference voltage value; when the temperature range is high, the output voltage of the power converter is reduced from the reference voltage value to the target voltage value using a preset voltage reduction method; when the temperature range is constant, the output voltage of the voltage regulation unit is adjusted to the target voltage value. This achieves adjustment of the output voltage of the voltage regulation unit based on the current temperature value of the resistive heating element, ensuring system voltage stability while allowing the resistive heating element to reach the target temperature as quickly as possible, thus achieving efficient and accurate heating of the heating circuit.

[0099] This application also provides a heating circuit, such as Figure 1 As shown, the heating circuit includes a power supply unit 101, a control unit 102, a voltage monitoring unit 103, a voltage regulation unit 104, and a resistive heating element 105.

[0100] The power supply unit 101 is connected to the control unit 102 and the voltage regulation unit 104 respectively. The control unit 102 is connected to the voltage monitoring unit 103 and the voltage regulation unit 104 respectively. The voltage regulation unit 104 is connected to the resistive heating device 105.

[0101] The voltage monitoring unit 103 is used to acquire the system voltage Vsys at the output terminal of the power supply unit 101. The control unit 102 is used to acquire the reference voltage value output by the voltage regulation unit 104 when the system voltage Vsys reaches a preset safety condition, and adjust the output voltage Vout of the voltage regulation unit 104 according to the reference voltage value to supply power to the resistive heating device 105.

[0102] Optionally, the power supply unit 101, which provides electrical energy, may include a system power supply that directly powers the control unit 102 and the voltage regulation unit 104. However, as the power of the system power supply decreases and the number of uses increases, the internal resistance increases, thereby reducing the system voltage Vsys at the output of the system power supply. Alternatively, the power supply unit 101 may include a power supply battery and a system power supply connected to the power supply battery. The power supply battery supplies power to the control unit 102 and the voltage regulation unit 104 through the system power supply. However, the voltage drop caused by the path impedance on the transmission path from the power supply battery to the system power supply further reduces the system voltage Vsys at the output of the system power supply.

[0103] Optionally, the voltage monitoring unit 103, which is used to monitor the system voltage Vsys at the output of the system power supply, can be an ADC voltage monitoring circuit.

[0104] The operation of the heating circuit described above is as follows:

[0105] After the system power supply supplies power to the control unit 102 and the voltage regulation unit 104, under the action of the control unit 102, the output voltage Vout of the voltage regulation unit 104 to the resistive heating device 105 gradually increases from the minimum voltage value Vmin to the maximum voltage value Vmax. The voltage monitoring unit 103 monitors the system voltage Vsys at the output terminal of the system power supply in real time and feeds it back to the control unit 102. The control unit 102 then determines whether the system voltage Vsys at the output terminal of the system power supply has reached the preset safety condition. For example, it determines whether the system voltage Vsys is less than or equal to the safety voltage threshold. If so, it obtains the output voltage Vout of the voltage regulation unit 104 at the current moment as the reference voltage value of the critical state, and controls the output voltage Vout of the voltage regulation unit 104 to no longer increase, and further controls the output voltage Vout of the voltage regulation unit 104 based on the reference voltage value.

[0106] In this embodiment, the heating circuit includes a power supply unit, a control unit, a voltage monitoring unit, a voltage regulation unit, and a resistive heating element. The power supply unit is connected to both the control unit and the voltage regulation unit; the control unit is connected to both the voltage monitoring unit and the voltage regulation unit; and the voltage regulation unit is connected to the resistive heating element. The voltage monitoring unit acquires the system voltage at the output of the power supply unit. The control unit acquires a reference voltage value output by the voltage regulation unit when the system voltage reaches a preset safety condition, and adjusts the output voltage of the voltage regulation unit according to the reference voltage value to supply power to the resistive heating element. This allows for real-time monitoring of the system voltage at the output of the power supply unit and timely adjustment of the voltage output of the voltage regulation unit when the system voltage reaches the preset safety condition, preventing severe voltage drops, ensuring system voltage stability, and thus achieving stable operation of the heating circuit and extending its service life.

[0107] As mentioned earlier, in the actual operation of the heating circuit, it is necessary not only to control the output voltage Vout to the resistive heating element 105, but also to control the temperature of the resistive heating element 105, and then combine this with the output voltage Vout of the temperature control voltage adjustment unit 104 to the resistive heating element 105. Figure 3 As shown, the heating circuit also includes a temperature sensor 106 connected to the control unit 102 for obtaining the temperature of the resistive heating element 105.

[0108] The process of adjusting the output voltage of the resistive heating element in the heating circuit, in conjunction with temperature control of the resistive heating element, is as follows:

[0109] When the voltage regulation unit 104 outputs voltage to the resistive heating device 105, as the output voltage Vout increases, the output power of the resistive heating device 105 also gradually increases, converting more electrical energy into heat energy, and the resistive heating device 105 gradually heats up. The control unit 102 monitors the current temperature of the resistive heating device 105 in real time through the temperature sensor 106. If the current temperature does not reach the preset temperature threshold (i.e., it belongs to the low temperature zone), the aforementioned reference voltage value is used as the output voltage Vout of the voltage regulation unit 104 and is continuously output, and the resistive heating device 105 continues to heat up. If the current temperature of the resistive heating device 105 reaches the preset temperature threshold but does not reach the target temperature threshold (i.e., it belongs to the high temperature zone), the output voltage Vout of the voltage regulation unit 104 is reduced from the reference voltage value using a preset voltage reduction method until the current temperature of the resistive heating device 105 reaches the target temperature threshold (entering the constant temperature zone). When the current temperature of the resistive heating element 105 reaches the target temperature threshold, the output voltage Vout of the voltage regulation unit 104 is the target voltage value. After the current temperature of the resistive heating element 105 reaches the target temperature threshold, the target voltage value is used as the output voltage Vout of the voltage regulation unit 104 and is continuously output to control the current temperature value of the resistive heating element 105 to be maintained at the target temperature.

[0110] In this embodiment, the heating circuit also includes a temperature sensor connected to the control unit. The temperature sensor is used to acquire the current temperature value of the resistive heating element. The control unit is used to control the output voltage of the voltage regulation unit based on the current temperature value of the resistive heating element. This achieves the adjustment of the output voltage of the voltage regulation unit based on the current temperature value of the resistive heating element, ensuring system voltage stability while bringing the resistive heating element to the target temperature as quickly as possible, thus achieving efficient and accurate heating.

[0111] In one embodiment, the voltage regulation unit 104 is a PWM voltage regulation circuit, such as... Figure 9 As shown, it includes an RC filter circuit 1041, a voltage divider circuit 1042, and a first power conversion circuit 1043 connected in series.

[0112] The RC filter circuit 1041 is connected to the control unit 102, and the first power conversion circuit 1043 is connected to the power supply unit 101.

[0113] Optionally, such as Figure 9As shown, the RC filter circuit 1041 comprises a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. One end of the first resistor R1 is connected to one end of the first capacitor and also to one end of the second resistor R2. The other end of the first capacitor C1 is grounded. The other end of the second resistor R2 is connected to one end of the second capacitor C2 and also to a voltage divider circuit. The other end of the second capacitor C2 is grounded.

[0114] Optionally, such as Figure 9 As shown, the voltage divider circuit 1042 includes three resistors connected in parallel: a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. One end of the fourth resistor R4 is connected to the second resistor R2 and the second capacitor C2 in the RC filter circuit. The fifth resistor R5 is grounded, and the sixth resistor R6 is the output resistor.

[0115] Optionally, the first power conversion circuit 1043 is a DC-DC power supply chip. The power supply unit 101 is connected to the VIN pin of the DC-DC power supply chip to provide a voltage signal. The voltage regulation unit 104 is connected to the FB pin of the DC-DC power supply chip to control the output voltage Vout of the DC-DC power supply chip to the resistive heating device 105 through the VOUT pin.

[0116] In an alternative embodiment, please continue reading Figure 9 The power supply unit 101 includes a system power supply 1011, a power supply battery 1012, a charging circuit 1013, and a second power conversion circuit 1014.

[0117] The charging circuit 1013 is connected to the system power supply 1011 and the power supply battery 1012. The power supply battery 1012 is connected to the system power supply 1011. The system power supply 1011 is connected to the voltage regulation unit 104 and is connected to the control unit 102 through the second power conversion circuit 1014.

[0118] Optionally, the charging circuit 1013 also includes a charging interface and a charging chip connected to the charging interface. The external adapter introduces external power through the charging interface and charges the power supply battery 1012 and supplies power to the system power supply 1011 (path 2) through the charging chip.

[0119] It should be noted that the resistive heating device 105 can operate based on the following two power supply modes:

[0120] Mode 1: The power supply battery 1012 supplies power to the system power supply 1011 through path 1, and then the system power supply 1011 supplies power to the resistive heating device 105 through the first power conversion circuit 1043 to drive the resistive heating device 105 to work.

[0121] Mode 2: The external adapter supplies power to the system power supply 1011 through the charging circuit 1013 and path 2, and then the system power supply 1011 supplies power to the resistive heating device 105 through the first power conversion circuit 1043 to drive the resistive heating device 105 to work.

[0122] It should be noted that the heating circuit provided in this embodiment is used to implement the heating control method in any of the above embodiments, and will not be described again here.

[0123] In one embodiment, this embodiment also provides an electric heating device, including the heating circuit described in any of the above claims, and correspondingly implements the heating control method described above.

[0124] Alternatively, the heating device can be a constant temperature water heater, a heated breast pump, etc.

[0125] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0126] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A heating control method, characterized in that, The method includes: During the process of the power supply unit supplying power to the resistive heating device through the voltage regulation unit, the system voltage at the output terminal of the power supply unit at the current moment is detected; Obtain the reference voltage value output by the voltage regulation unit when the system voltage reaches the preset safety condition; The output voltage of the voltage regulation unit is adjusted according to the reference voltage value to supply power to the resistive heating device.

2. The control method according to claim 1, characterized in that, The method further includes: Determine whether the system voltage is less than or equal to a preset safe voltage threshold; If so, determine that the system voltage has reached the preset safety condition.

3. The control method according to claim 1, characterized in that, The step of adjusting the output voltage of the voltage regulation unit according to the reference voltage includes: Obtain the temperature range in which the current temperature value of the resistive heating device is located; The output voltage of the voltage regulation unit is adjusted according to the temperature range and the reference voltage value.

4. The control method according to claim 3, characterized in that, The step of obtaining the temperature range in which the current temperature value of the resistive heating device is located includes: Obtain the current temperature value of the resistive heating device; If the current temperature value is less than a preset temperature threshold, the temperature region is determined to be a low temperature region; If the current temperature value is greater than the preset temperature threshold and less than the target temperature threshold, the temperature region is determined to be a high temperature region; If the current temperature value is equal to or greater than the target temperature threshold, the temperature region is determined to be a constant temperature region.

5. The control method according to claim 4, characterized in that, The step of adjusting the output voltage of the voltage regulation unit according to the temperature range and the reference voltage value includes: If the temperature range is the low temperature range, then adjust the output voltage of the voltage regulation unit to the reference voltage value; If the temperature range is the high temperature range, the output voltage of the voltage regulation unit is reduced from the reference voltage value to the target voltage value using a preset voltage reduction method; the target voltage value is the voltage value when the current temperature value of the resistive heating device reaches the target temperature threshold. If the temperature range is the constant temperature range, then adjust the output voltage of the voltage regulation unit to the target voltage value.

6. The control method according to claim 5, characterized in that, The step of reducing the output voltage of the voltage regulation unit from the reference voltage value to the target voltage value using a preset step-down method includes: The output voltage of the voltage regulation unit is reduced from the reference voltage value to the target voltage value by the same amount of voltage change; or, First increase the voltage change, then decrease the voltage change to reduce the output voltage of the voltage regulation unit from the reference voltage value to the target voltage value.

7. The control method according to any one of claims 1 to 6, characterized in that, The process of the power supply unit supplying power to the resistive heating device through the voltage regulation unit includes: The voltage output voltage from the voltage regulation unit to the resistive heating device is increased linearly.

8. A heating circuit, characterized in that, include: Power supply unit, control unit, voltage monitoring unit, voltage regulation unit, and resistive heating element; The power supply unit is connected to the control unit and the voltage regulation unit, the control unit is connected to the voltage monitoring unit and the voltage regulation unit, and the voltage regulation unit is connected to the resistive heating device. The voltage monitoring unit is used to acquire the system voltage at the output terminal of the power supply unit; The control unit is configured to acquire a reference voltage value output by the voltage regulation unit when the system voltage reaches a preset safety condition, and adjust the output voltage of the voltage regulation unit according to the reference voltage value to supply power to the resistive heating device.

9. The heating circuit according to claim 8, characterized in that, The heating circuit also includes a temperature sensor connected to the control unit, the temperature sensor being used to acquire the temperature of the resistive heating element; The control unit is used to control the output voltage of the voltage regulation unit according to the temperature of the resistive heating device.

10. The heating circuit according to claim 8 or 9, characterized in that, The voltage regulation unit includes: a series-connected RC filter circuit, a voltage divider circuit, and a first power conversion circuit; The RC filter circuit is connected to the control unit, and the first power conversion circuit is connected to the power supply unit.

11. The heating circuit according to claim 8 or 9, characterized in that, The power supply unit includes a charging circuit, a power supply battery, a system power supply, and a second power conversion circuit; wherein, the charging circuit is connected to the power supply battery and the system power supply, the power supply battery is connected to the system power supply, the system power supply is connected to the voltage regulation unit, and is connected to the control unit through the second power conversion circuit.

12. An electric heating device, characterized in that, The heating circuit includes any one of claims 8-11 above.

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