CN108243516B - Power control method and device of electromagnetic heating equipment and electromagnetic heating equipment - Google Patents
Power control method and device of electromagnetic heating equipment and electromagnetic heating equipment Download PDFInfo
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- CN108243516B CN108243516B CN201810110716.5A CN201810110716A CN108243516B CN 108243516 B CN108243516 B CN 108243516B CN 201810110716 A CN201810110716 A CN 201810110716A CN 108243516 B CN108243516 B CN 108243516B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
Abstract
The invention is suitable for the field of household appliances, and provides a power control method and a device of electromagnetic heating equipment and the electromagnetic heating equipment, wherein the power control method is applied to the electromagnetic heating equipment with a half-bridge topological structure, and the method comprises the following steps: acquiring target power and preset power, and comparing the target power with the preset power; and if the target power is less than or equal to the preset power, adjusting the duty ratio of the PWM control signal to enable the current actual power of the electromagnetic heating equipment to reach the target power. According to the power control method of the electromagnetic heating equipment, when the target power is smaller than the preset power, the purpose of outputting the low power by the electromagnetic heating equipment is achieved by reducing the duty ratio of the PWM control signal, intermittent heating is not needed, the cooking effect of food is better, and a user obtains better use experience.
Description
Technical Field
The invention belongs to the field of household appliances, and particularly relates to a power control method and device of electromagnetic heating equipment and the electromagnetic heating equipment.
Background
Electromagnetic heating equipment such as induction cookers and induction cookers has become an indispensable product for people's life. When using these electromagnetic heating devices, it is often necessary to use small power to heat, for example, when frying eggs and cooking soup, if the heating power is too large, the food material will be destroyed, and the taste of the food and even the appetite of the user will be affected.
At present, an electromagnetic heating device generally adopts a topological half-bridge heating principle, generally, the higher the working frequency is, the lower the heating power is, so the purpose of reducing the heating power can be achieved by increasing the working frequency, but due to the limitation of the self characteristics of circuits and components, for example, the higher the working frequency is, the larger the consumption of an IGBT switching power tube is, the more serious the heating is, and when the frequency is increased to a certain degree, the IGBT switching power tube falls into a hard switching working mode from a soft switching working mode, so that the working stability and safety performance of the IGBT switching power tube are reduced, so the working frequency cannot be increased any more, and therefore, the minimum heating power of the electromagnetic heating device is limited by the limitation. Generally, the working frequency can not exceed 60KHZ, and the heating power can still only be reduced to 300-500W. In order to obtain lower heating power, only an intermittent heating method can be adopted, namely, the electromagnetic heating device heats the food for a period of time and then is turned off for a period of time, and the operation is repeated to achieve a heating effect similar to that of the lower heating power, but the method can lead the cooker to be heated unevenly, and the user experience is poor.
Disclosure of Invention
The embodiment of the invention provides a power control method of electromagnetic heating equipment, and aims to solve the problem that the heating power of the existing electromagnetic heating equipment can be reduced only by intermittent heating.
The embodiment of the invention is realized in such a way that a power control method of electromagnetic heating equipment is applied to the electromagnetic heating equipment with a half-bridge topological structure, and the method comprises the following steps:
acquiring target power and preset power and comparing the target power with the preset power;
and if the target power is less than or equal to the preset power, adjusting the duty ratio of the PWM control signal to enable the current actual power of the electromagnetic heating equipment to reach the target power.
The invention also provides a power control device of the electromagnetic heating equipment, which is applied to the electromagnetic heating equipment with a half-bridge topology structure, and the device comprises:
the power acquisition unit is used for acquiring target power and preset power and comparing the target power with the preset power;
and the first power control unit is used for adjusting the duty ratio of the PWM control signal if the target power is less than or equal to the preset power so as to enable the current actual power of the electromagnetic heating equipment to reach the target power.
An embodiment of the present invention further provides an electromagnetic heating apparatus, where the electromagnetic heating apparatus includes:
a control unit including a power control device of the electromagnetic heating apparatus according to any one of the above aspects;
a half-bridge topology circuit connected to the control unit; and
and the induction coil is connected with the half-bridge topological structure circuit.
According to the power control method of the electromagnetic heating equipment, when the target power is smaller than the preset power, the purpose of outputting the low power by the electromagnetic heating equipment is achieved by reducing the duty ratio of the PWM control signal, intermittent heating is not needed, the cooking effect of food is better, and a user obtains better use experience.
Drawings
Fig. 1 is a flowchart of a control method of a power control method of an electromagnetic heating apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart of another control method of a power control method of an electromagnetic heating device according to an embodiment of the present invention;
FIG. 3 is a flow chart for regulating power by controlling the duty cycle of a PWM control signal according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of a control apparatus provided in an embodiment of the present invention;
FIG. 5 is another functional block diagram of a control apparatus provided in an embodiment of the present invention;
FIG. 6 is a waveform diagram of a PWM control signal according to an embodiment of the present invention;
FIG. 7 is a waveform diagram of another PWM control signal provided by an embodiment of the present invention;
fig. 8 is a partial circuit diagram of a heating portion of an electromagnetic heating apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the power control method of the electromagnetic heating equipment, when the target power is lower than the preset power, the work of the electromagnetic heating equipment is controlled in a mode of reducing the duty ratio of the PWM signal, and the heating power of the electromagnetic heating equipment can be reduced under the condition that the working frequency is not increased.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
The power control method of the electromagnetic heating device provided by the invention is applied to the electromagnetic heating device with a half-bridge topology structure, and particularly as shown in fig. 1, the method comprises the following steps:
step S1, acquiring target power and preset power, and comparing the target power with the preset power;
in the embodiment provided by the present invention, the target power refers to a required heating power input by a user to the electromagnetic heating device, and the setting input of the heating power by the user may be through a touch press, a rotary knob, a gesture recognition, and the like, which is not limited herein.
In addition, the preset power refers to a heating power prestored by the electromagnetic heating equipment, and the preset power is used for judging which power control mode the electromagnetic heating equipment is to enter. The preset power is generally set between 200W and 500W, and when the target power is less than or equal to the preset power, a low-power control mode is entered; and when the target power is larger than the preset power, entering a non-small power control mode.
Step S2, if the target power is less than or equal to a preset power, adjusting a duty ratio of a PWM control signal to make the current actual power of the electromagnetic heating device reach the target power.
In the embodiment provided by the invention, the on and off of the IGBT switching tube are controlled by a PWM control mode (PWM is an abbreviation of Pulse Width Modulation, namely the Width of a Pulse is modulated), and when the target power is less than or equal to the preset power, the duty ratio of a PWM control signal can be reduced (namely the Pulse Width of the PWM control signal is reduced), so that the effective working interval of the PWM control signal is reduced, and the purpose of reducing the heating power is further achieved. Namely, the purpose of reducing the heating power of the electromagnetic heating equipment is achieved by reducing the pulse width of the PWM control signal, and the electromagnetic heating equipment can output the small heating power required by a user without intermittent heating, so that the electromagnetic heating equipment can continuously output the small power, the phenomenon of uneven heating temperature is avoided, and the user can obtain better use experience.
Meanwhile, the rise of heating power caused by reducing the frequency of the PWM control signal can be compensated by reducing the duty ratio of the PWM control signal, namely, when the heating power of the electromagnetic heating equipment is reduced by reducing the duty ratio of the PWM control signal, the frequency of the PWM control signal can be properly reduced, so that the loss of an IGBT switching tube is reduced, and the service life of the whole circuit is prolonged.
As shown in fig. 5, in the embodiment provided by the present invention, the PWM control signals are two PWM signals with complementary dead zones.
As shown in fig. 2, in the embodiment of the present invention, after the step of obtaining the target power and the preset power in step S1, the method further includes:
and S2', if the target power is larger than the preset power, adjusting the frequency of the PWM control signal to enable the current actual power of the electromagnetic heating equipment to reach the target power. That is, when the target power is greater than the preset power, the heating power of the electromagnetic heating apparatus is increased by controlling the frequency of the PWM control signal. Specifically, the heating power of the electromagnetic heating device is increased by reducing the frequency of the PWM control signal, and the heating power of the electromagnetic heating device is decreased by increasing the frequency of the PWM control signal.
As shown in fig. 3, in the embodiment of the present invention, step S2, that is, if the target power is less than or equal to a preset power, the duty ratio of the PWM control signal is adjusted to make the power of the electromagnetic heating device reach the target power, specifically:
and step S21, when the target power is less than or equal to a preset power, adjusting the frequency of the PWM control signal to a preset frequency, and acquiring the current actual power of the electromagnetic heating equipment.
In this embodiment, when the target power is less than or equal to the preset power, the frequency of the PWM control signal is first adjusted to the preset frequency, and since the higher the frequency of the PWM control signal is, the more significant the IGBT switch tube generates heat, in order to reduce the heat generation of the IGBT switch tube, the preset frequency is set between 15KHz and 60KHz in this embodiment. In addition, when the frequency is lower than 18KHZ, the frequency falls into the hearing range of human ears, so that large noise is generated, and the physical and mental health of people is affected, so that as a further preference, the preset frequency is set to be between 18KHz and 25KHz, such as 20 KHZ.
The current actual power of the electromagnetic heating device is obtained in order to determine whether the power should be increased or decreased on the basis of the current actual power, relative to the power set by the user. Therefore, the control method further comprises the following steps:
and step S22, if the current actual power of the electromagnetic heating equipment is smaller than the target power, increasing the duty ratio of the PWM control signal, so that the effective working interval of the PWM control signal is increased, and the heating power of the electromagnetic heating equipment is increased.
And step S22', if the current actual power of the electromagnetic heating equipment is greater than the target power, reducing the duty ratio of the PWM control signal, so as to reduce the effective working interval of the PWM control signal and reduce the heating power of the electromagnetic heating equipment.
In addition, in practical use, when the target power is higher than the preset power, the output power of the electromagnetic heating device is adjusted by adjusting the frequency of the PWM control signal, if the preset power is fixed, the higher the working voltage is, the higher the frequency of the PWM control signal is, the higher the switching loss of the IGBT switch tube is, which is not favorable for reliable operation of the IGBT switch tube, and the lower the energy utilization efficiency is. In order to improve this problem, in another embodiment of the present invention, before comparing the target power with a preset power, the method further includes: and judging the working voltage of the half-bridge electromagnetic heating device, and adjusting the preset power according to the working voltage. That is, in the present embodiment, the predetermined power is a variable value. When the working voltage is higher, the preset power is increased, so that the mode of adjusting the duty ratio of the PWM control signal to adjust the output power of the electromagnetic heating equipment can be entered as soon as possible. Because the mode of adjusting the output power of the electromagnetic heating equipment by adjusting the duty ratio of the PWM control signal works at a lower PWM frequency, the switching loss of the IGBT switching tube is lower, and the heat generation is smaller, thereby not only being beneficial to the reliable work of the switching tube, but also improving the energy utilization efficiency.
As shown in fig. 6 and 7, in the embodiment provided by the present invention, when the PWM control signals are two PWM signals with complementary dead zones, the power control method further includes the following steps:
in a period T of the PWM control signal, controlling the first path of PWM signal to output a high level within the time T1, delaying for the time T1, controlling the second path of PWM signal to output a high level within the time T2, and entering the next period after the time T2; wherein, both T1 and T2 are longer than the time required for turning on the upper and lower bridge arm switch tubes, both T1 and T2 are longer than the dead time of the controlled switch tube, and T1 or T2 is not less than 3 times of the larger of T1 and T2.
That is, as shown in fig. 8, in one duty cycle T of the PWM control signal, in order to reduce the heating power, the pulse widths of the first PWM signal (i.e., the PWM control signal for controlling the IGBT switch Q1 of the upper arm) and the second PWM signal (i.e., the PWM control signal for controlling the IGBT switch Q2 of the lower arm) are respectively reduced, wherein the time of T1 and the time of T2 are both longer than the time of the IGBT switch being turned on in order to enable the IGBT switch of the upper arm and the IGBT switch of the lower arm to operate normally. In order to avoid the short circuit caused by the fact that the IGBT switching tubes Q1 and Q2 of the upper and lower bridge arms are conducted simultaneously, t1 and t2 are both larger than the dead time of the IGBT switching tubes. In order to reduce the heating power of the electromagnetic heating device to a desired value, in the present embodiment, the time of T1 or T2 is set to be not less than 3 times the larger of T1 and T2.
In addition, as shown in fig. 6, in a specific implementation manner of this embodiment, in order to facilitate software control and reduce software programming difficulty, the two PWM signals are symmetrically set, that is, the values of TI and T2 are set to be equal, and the values of T1 and T2 are set to be equal.
As shown in fig. 7, in another specific implementation manner of this embodiment, the two PWM signals may also be asymmetrically arranged, so that the IGBT switch tube can more easily enter the soft switch, and the heat generation of the IGBT switch tube is reduced. Specifically, in the present embodiment, TI is set equal to the value of T2, and T1 is set unequal to T2.
In summary, in the power control method of the electromagnetic heating apparatus provided by the present invention, when the target power is less than the preset power, reducing the power of the electromagnetic heating device is achieved by reducing the duty cycle of the PWM control signal (i.e. reducing the pulse width), meanwhile, the heating power can be reduced by reducing the pulse width of the PWM control signal, the loss of the IGBT switch tube can be reduced by reducing the pulse frequency of the PWM control signal, but the heating power can be improved, in the actual control process, the frequency of the PWM control signal can be reduced to a preset frequency, and the heating power is reduced by reducing the pulse width of the PWM control signal (the rise of the heating power caused by reducing the frequency of the PWM control signal can be compensated for), through the reasonable setting of the two, the heating power can be reduced, intermittent heating is not needed, and meanwhile, the loss effect of an IGBT switch tube can be reduced.
The present invention also provides a power control device of an electromagnetic heating apparatus, which is applied to an electromagnetic heating apparatus with a half-bridge topology, wherein, as shown in fig. 4, the power control device comprises:
a power obtaining unit 100, configured to obtain a target power and a preset power, and compare the target power with the preset power; the first power control unit 200 is configured to adjust a duty ratio of the PWM control signal if the target power is less than or equal to a preset power, so that the current actual power of the electromagnetic heating device reaches the target power.
In the embodiment provided by the present invention, the target power refers to a required heating power input by a user to the electromagnetic heating device, the setting input of the heating power by the user may be through touch pressing, knob rotating, gesture recognition, and the like, and the power obtaining unit may be a touch sensing device, a knob device, a gesture recognition device, and the like.
In addition, the preset power refers to a heating power prestored in the production process of the electromagnetic heating equipment, and the preset power is used for judging which power control mode the electromagnetic heating equipment enters. The preset power can be generally set between 200W and 500W, and when the target power is less than or equal to the preset power, the low-power control mode is entered; and when the target power is larger than the preset power, entering a non-small power control mode.
In the embodiment provided by the invention, the on/off of the IGBT switching tube is controlled by a PWM control mode (PWM is an abbreviation of Pulse Width Modulation, namely the Width of a Pulse is modulated), and when the target power is less than or equal to the preset power, the duty ratio of a PWM control signal can be reduced (namely the Pulse Width of the PWM control signal is reduced) through the first power control unit, so that the effective working interval of the PWM control signal is reduced, and the purpose of reducing the heating power is further achieved. Namely, the purpose of reducing the heating power of the electromagnetic heating equipment is achieved by reducing the pulse width of the PWM control signal, and the electromagnetic heating equipment can output the small heating power required by a user without intermittent heating, so that the electromagnetic heating equipment can continuously output the small power, the phenomenon that the heating temperature is suddenly changed is avoided, and the user can obtain better use experience.
Meanwhile, the rise of heating power caused by reducing the frequency of the PWM control signal can be compensated by reducing the duty ratio of the PWM control signal, namely, when the heating power of the electromagnetic heating equipment is reduced by reducing the duty ratio of the PWM control signal, the frequency of the PWM control signal can be properly reduced, so that the loss of an IGBT switching tube is reduced, and the service life of the whole circuit is prolonged.
As shown in fig. 7, in the embodiment provided by the present invention, the PWM control signals are two PWM signals with complementary dead zones. Specifically, as shown in fig. 6, the PWM control signal controls the on and off of two IGBT switching tubes Q1 and Q2, and further controls the inductor L and the two capacitors C1 and C2 to form an oscillator circuit.
In the embodiment of the present invention as shown in fig. 5, the power control apparatus further includes:
and the second power control unit 200' is configured to adjust the frequency of the PWM control signal if the target power is greater than the preset power, so that the current actual power of the electromagnetic heating device reaches the target power. That is, when the input power is greater than the preset power, the heating power of the electromagnetic heating apparatus is increased by controlling the frequency of the PWM control signal by the second power control unit. Specifically, the heating power of the electromagnetic heating device is increased by reducing the frequency of the PWM control signal, and the heating power of the electromagnetic heating device is decreased by increasing the frequency of the PWM control signal.
In an embodiment provided by the present invention, the first power control unit is further configured to:
when the target power is smaller than or equal to a preset power, adjusting the frequency of the PWM control signal to a preset frequency, and acquiring the current actual power of the electromagnetic heating equipment; if the current actual power of the electromagnetic heating equipment is smaller than the target power, increasing the duty ratio of the PWM control signal; and if the current actual power of the electromagnetic heating equipment is greater than the target power, reducing the duty ratio of the PWM control signal.
That is, in the present embodiment, when the target power is less than or equal to the preset power, the frequency of the PWM control signal is adjusted to the preset frequency by the first power control unit, and since the heat generation of the IGBT switch tube is more significant as the frequency of the PWM control signal is higher, the preset frequency is set between 15KHz and 60KHz in the present embodiment in order to reduce the heat generation of the IGBT switch tube. In addition, when the frequency is lower than 18KHZ, the frequency falls into the hearing range of human ears, so that large noise is generated, and the physical and mental health of people is affected, so that as a further preference, the preset frequency is set to be between 18KHz and 25KHz, such as 20 KHZ.
The current actual power of the electromagnetic heating equipment is obtained to judge whether the power is increased or reduced on the basis of the current actual power relative to the target power, and when the current actual power is smaller than the target power, the duty ratio of the PWM control signal is increased, so that the effective working interval of the PWM control signal is increased, and the heating power of the electromagnetic heating equipment is increased; if the current actual power is larger than the target power, the duty ratio of the PWM control signal is reduced, so that the effective working interval of the PWM control signal is reduced, and the heating power of the electromagnetic heating equipment is reduced.
In addition, in practical use, when the target power is higher than the preset power, the output power of the electromagnetic heating device is adjusted by adjusting the frequency of the PWM control signal, if the preset power is fixed, the higher the working voltage is, the higher the frequency of the PWM control signal is, the higher the switching loss of the IGBT switch tube is, which is not favorable for reliable operation of the IGBT switch tube, and the lower the energy utilization efficiency is. To improve this problem, in another embodiment provided by the present invention, the apparatus further comprises: and the voltage judging unit is used for judging the working voltage of the half-bridge electromagnetic heating device before the power acquiring unit compares the target power with the preset power, and adjusting the preset power according to the working voltage. That is, in the present embodiment, the predetermined power is a variable value. When the working voltage is higher, the preset power is increased, so that the mode of adjusting the duty ratio of the PWM control signal to adjust the output power of the electromagnetic heating equipment can be entered as soon as possible. Because the mode of adjusting the output power of the electromagnetic heating equipment by adjusting the duty ratio of the PWM control signal works at a lower PWM frequency, the switching loss of the IGBT switching tube is lower, and the heat generation is smaller, thereby not only being beneficial to the reliable work of the switching tube, but also improving the energy utilization efficiency.
As shown in fig. 6 and 7, in an embodiment provided by the present invention, the power control apparatus further includes: the PWM control signal setting unit is used for controlling the first path of PWM signal to output high level within the time T1 in one period T of the PWM control signal, controlling the second path of PWM signal to output high level within the time T2 after delaying the time T1, and entering the next period after the time T2; wherein, both T1 and T2 are longer than the time required for turning on the upper and lower bridge arm switch tubes, both T1 and T2 are longer than the dead time of the controlled switch tube, and T1 or T2 is not less than 3 times of the larger of T1 and T2.
That is, as shown in fig. 8, in one duty cycle T of the PWM control signal, in order to reduce the heating power, the pulse widths of the first PWM signal (i.e., the PWM control signal for controlling the IGBT switch Q1 of the upper arm) and the second PWM signal (i.e., the PWM control signal for controlling the IGBT switch Q2 of the lower arm) are respectively reduced, wherein the time of T1 and the time of T2 are both longer than the time of the IGBT switch being turned on in order to enable the IGBT switch of the upper arm and the IGBT switch of the lower arm to operate normally. In order to avoid the short circuit caused by the fact that the IGBT switching tubes Q1 and Q2 of the upper and lower bridge arms are conducted simultaneously, t1 and t2 are both larger than the dead time of the IGBT switching tubes. In order to reduce the heating power of the electromagnetic heating device to a desired value, in the present embodiment, the time of T1 or T2 is set to be not less than 3 times the larger of T1 and T2.
In addition, as shown in fig. 6, in a specific implementation manner of this embodiment, in order to facilitate software control and reduce software programming difficulty, the two PWM signals are symmetrically set, that is, the values of TI and T2 are set to be equal, and the values of T1 and T2 are set to be equal.
As shown in fig. 7, in another specific implementation manner of this embodiment, the two PWM signals may also be asymmetrically arranged, so that the IGBT switch tube can more easily enter the soft switch, and the heat generation of the IGBT switch tube is reduced. Specifically, in the present embodiment, TI is set equal to the value of T2, and T1 is set unequal to T2.
In addition, the present invention also provides an electromagnetic heating apparatus including: a control unit, including the power control device of the electromagnetic heating apparatus according to the above embodiment, and in order to avoid repeated descriptions, the control device is not described repeatedly in this embodiment; a half-bridge topology circuit connected to the control unit; and an induction coil connected to the half-bridge topology circuit.
The electromagnetic heating equipment provided by the invention uses the power control device, so that the purpose of low-power heating can be achieved without intermittent heating when the electromagnetic heating equipment works, the cooking effect of the electromagnetic heating equipment on food is better, and the use experience of a user is improved.
The above-described units, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, electrical signals, software distribution medium, and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. A power control method of an electromagnetic heating device is applied to the electromagnetic heating device with a half-bridge topology structure, and is characterized by comprising the following steps:
acquiring target power and preset power, and comparing the target power with the preset power;
if the target power is less than or equal to the preset power, adjusting the duty ratio of a PWM control signal to enable the current actual power of the electromagnetic heating equipment to reach the target power;
if the target power is larger than the preset power, adjusting the frequency of the PWM control signal to enable the current actual power of the electromagnetic heating equipment to reach the target power;
before comparing the target power with the preset power, the method further includes: and judging the working voltage of the electromagnetic heating equipment, and adjusting the preset power according to the working voltage.
2. The power control method of the electromagnetic heating device according to claim 1, wherein the PWM control signals are two PWM signals with complementary dead zones.
3. The power control method of the electromagnetic heating device according to claim 1, wherein if the target power is less than or equal to a preset power, the step of adjusting a duty ratio of a PWM control signal to make the power of the electromagnetic heating device reach the target power specifically comprises:
when the target power is smaller than or equal to a preset power, adjusting the frequency of the PWM control signal to a preset frequency, and acquiring the current actual power of the electromagnetic heating equipment;
if the current actual power of the electromagnetic heating equipment is smaller than the target power, increasing the duty ratio of the PWM control signal;
and if the current actual power of the electromagnetic heating equipment is greater than the target power, reducing the duty ratio of the PWM control signal.
4. A power control method for an electromagnetic heating apparatus as set forth in claim 3, wherein said predetermined frequency is 18KHz to 25 KHz.
5. A method for power control of an electromagnetic heating apparatus as claimed in claim 2, characterized in that the method further comprises the steps of:
in a period T of the PWM control signal, controlling the first path of PWM signal to output a high level within the time T1, delaying for the time T1, controlling the second path of PWM signal to output a high level within the time T2, and entering the next period after the time T2;
wherein, both T1 and T2 are longer than the time required for turning on the upper and lower bridge arm switch tubes, both T1 and T2 are longer than the dead time of the controlled switch tube, and T1 or T2 is not less than 3 times of the larger of T1 and T2.
6. A power control device of an electromagnetic heating device, which is applied to the electromagnetic heating device with a half-bridge topology, and is characterized in that the device comprises:
the power acquisition unit is used for acquiring target power and preset power and comparing the target power with the preset power;
the first power control unit is used for adjusting the duty ratio of a PWM control signal when the target power is less than or equal to the preset power so as to enable the current actual power of the electromagnetic heating equipment to reach the target power;
the second power control unit is used for adjusting the frequency of the PWM control signal if the target power is greater than the preset power so that the current actual power of the electromagnetic heating equipment reaches the target power;
and the voltage judging unit is used for judging the working voltage of the electromagnetic heating equipment before the power acquiring unit compares the target power with the preset power, and adjusting the preset power according to the working voltage.
7. The power control device of the electromagnetic heating equipment according to claim 6, characterized in that the PWM control signals are two PWM signals with complementary dead zones.
8. A power control arrangement of an electromagnetic heating device as claimed in claim 6, characterized in that the first power control unit is further adapted to:
when the target power is smaller than or equal to a preset power, adjusting the frequency of the PWM control signal to a preset frequency, and acquiring the current actual power of the electromagnetic heating equipment;
if the current actual power of the electromagnetic heating equipment is smaller than the target power, increasing the duty ratio of the PWM control signal;
and if the current actual power of the electromagnetic heating equipment is greater than the target power, reducing the duty ratio of the PWM control signal.
9. A power control device for an electromagnetic heating apparatus as set forth in claim 8, wherein said predetermined frequency is 18KHz to 25 KHz.
10. A power control device of an electromagnetic heating apparatus according to claim 7, characterized in that said device further comprises:
the PWM control signal setting unit is used for controlling the first path of PWM signal to output high level within the time T1 in one period T of the PWM control signal, controlling the second path of PWM signal to output high level within the time T2 after delaying the time T1, and entering the next period after the time T2;
wherein, both T1 and T2 are longer than the time required for turning on the upper and lower bridge arm switch tubes, both T1 and T2 are longer than the dead time of the controlled switch tube, and T1 or T2 is not less than 3 times of the larger of T1 and T2.
11. An electromagnetic heating apparatus, characterized in that the electromagnetic heating apparatus comprises:
a control section comprising a power control device of the electromagnetic heating apparatus according to any one of claims 6 to 10;
a half-bridge topology circuit connected to the control unit; and
and the induction coil is connected with the half-bridge topological structure circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810110716.5A CN108243516B (en) | 2018-02-05 | 2018-02-05 | Power control method and device of electromagnetic heating equipment and electromagnetic heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810110716.5A CN108243516B (en) | 2018-02-05 | 2018-02-05 | Power control method and device of electromagnetic heating equipment and electromagnetic heating equipment |
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| CN108930999A (en) * | 2018-07-08 | 2018-12-04 | 苏州妙文信息科技有限公司 | A kind of shower house intelligent bathroom heater |
| CN108954483A (en) * | 2018-07-08 | 2018-12-07 | 苏州妙文信息科技有限公司 | A kind of intelligent bathroom heater temperature control method |
| CN109121240A (en) * | 2018-09-30 | 2019-01-01 | 珠海格力电器股份有限公司 | Cookware self-adaptive electromagnetic heating system, electromagnetic heater, method for heating and controlling |
| CN111385926B (en) * | 2018-12-29 | 2022-03-22 | 佛山市顺德区美的电热电器制造有限公司 | Control method and device of electromagnetic heating appliance and electromagnetic heating appliance |
| CN110958728B (en) * | 2019-11-14 | 2022-02-01 | 九阳股份有限公司 | Method for controlling power of electromagnetic heating equipment and electromagnetic heating equipment |
| CN112888100B (en) * | 2019-11-29 | 2023-05-02 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic heating control method of half-bridge electromagnetic appliance and half-bridge electromagnetic appliance |
| CN111012175B (en) * | 2019-12-04 | 2021-09-24 | 宁波拓邦智能控制有限公司 | Control method and device of wall breaking machine, wall breaking machine and computer readable storage medium |
| CN113382492B (en) * | 2021-06-21 | 2024-01-23 | 广东美的厨房电器制造有限公司 | Control method of microwave generating device, cooking device and readable storage medium |
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