CN114390737A - Power control circuit and power control method of electromagnetic heating device - Google Patents
Power control circuit and power control method of electromagnetic heating device Download PDFInfo
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Abstract
The application discloses a power control circuit and a power control method of an electromagnetic heating device. The power control circuit includes: a resonant circuit; the control circuit is connected with the resonant circuit and controls the resonant circuit to work based on the power control signal; the detection circuit is connected in a resonant circuit of the resonant circuit, is connected with the control circuit and is used for detecting the output power of the resonant circuit; the control circuit is further used for adjusting the power control signal based on the output power and the target power of the resonant circuit so as to control the resonant circuit to work by using the adjusted power control signal. In this way, the accuracy of the power control of the electromagnetic heating device can be improved.
Description
Technical Field
The present disclosure relates to electromagnetic heating technologies, and in particular, to a power control circuit and a power control method for an electromagnetic heating device.
Background
The electromagnetic heating device realizes electromagnetic heating based on the alternating magnetic field of the resonant circuit. When the power supply characteristics of the resonant circuit change, the power of electromagnetic heating and the like change, and an effective electromagnetic heating function cannot be realized.
In order to solve the above problems, in the prior art, the bus voltage (power supply) and the bus current (power supply) are sampled, and the total input power of the resonant circuit is obtained based on the bus voltage and the bus current, so as to monitor the output power of the resonant circuit. However, in this way, the output power of each resonant tank in the resonant circuit cannot be monitored, and therefore, the power control accuracy is low.
Disclosure of Invention
The technical problem mainly solved by the application is to provide a power control circuit and a power control method of an electromagnetic heating device, which can improve the accuracy of power control of the electromagnetic heating device.
In order to solve the technical problem, the application adopts a technical scheme that: a power control circuit for an electromagnetic heating device is provided. The power control circuit includes: a resonant circuit; the control circuit is connected with the resonant circuit and controls the resonant circuit to work based on the power control signal; the detection circuit is connected in a resonant circuit of the resonant circuit, is connected with the control circuit and is used for detecting the output power of the resonant circuit; the control circuit is further used for adjusting the power control signal based on the output power and the target power of the resonant circuit so as to control the resonant circuit to work by using the adjusted power control signal.
In one embodiment, a resonant circuit includes: a coil, the first end of which is connected with the detection circuit and the control circuit; and a first end of the resonance capacitor is connected with the second end of the coil, and a second end of the resonance capacitor is connected with the detection circuit.
In one embodiment, the power control circuit includes at least two resonant circuits, at least two detection circuits, and at least two control circuits; the first end of a coil of a resonant circuit is connected with a detection circuit and a control circuit, the first end of a resonant capacitor of the resonant circuit is connected with the second end of the coil of the resonant circuit, and the second end of the resonant capacitor of the resonant circuit is connected with the detection circuit; the first end of the coil of the other resonant circuit is connected with the other detection circuit and the other control circuit, the first end of the resonant capacitor of the other resonant circuit is connected with the second end of the coil of the other resonant circuit, and the second end of the resonant capacitor of the other resonant circuit is connected with the other detection circuit.
In one embodiment, a detection circuit includes: the first acquisition end of the voltage sampling circuit is connected with the first end of the coil, and the output end of the voltage sampling circuit is connected with the control circuit and used for acquiring the resonance voltage of the resonance circuit; a first acquisition end of the current sampling circuit is connected with a second end of the resonant capacitor, a second acquisition end of the current sampling circuit is connected with a second acquisition end of the voltage sampling circuit, and an output end of the current sampling circuit is connected with the control circuit and is used for acquiring the resonant current of the resonant circuit; the control circuit calculates the output power of the resonant tank based on the resonant voltage and the resonant current.
In one embodiment, the control circuit includes: the input end of the power regulating circuit is respectively connected with the second end of the voltage sampling circuit and the second end of the current sampling circuit, and the power regulating circuit is used for calculating the output power of the resonant circuit based on the resonant voltage and the resonant current and regulating the power control signal based on the output power and the target power; and the control end of the switching tube is connected with the power regulating circuit, and the communication end of the switching tube is connected with the second end of the coil and is used for switching on and off under the control of the power control signal so as to regulate the output power of the resonant circuit.
In order to solve the technical problem, the application adopts a technical scheme that: a power control method of an electromagnetic heating device is provided. The power control method is used for the power control circuit, and comprises the following steps: acquiring output power of a resonant circuit; comparing the output power with a target power of the resonant circuit; and adjusting the power control signal based on the comparison result so as to control the resonant circuit to work by using the adjusted power control signal.
In one embodiment, the obtaining of the output power of the resonant tank of the resonant circuit includes: acquiring a sampling period; setting a plurality of sampling points in a sampling period, and acquiring the resonance voltage and the resonance current of a resonance circuit corresponding to the sampling points; and calculating the average power of the resonant circuit in the sampling period as the output power based on the plurality of resonant voltages and the plurality of resonant currents.
In an embodiment, the adjusting the power control signal based on the comparison result includes: the frequency of the power control signal is adjusted based on the comparison.
In one embodiment, the adjusting the frequency of the power control signal based on the comparison result includes: in response to the output power being greater than the target power, increasing the frequency of the power control signal; in response to the output power being less than the target power, the frequency of the power control signal is decreased.
In an embodiment, the adjusting the power control signal based on the comparison result includes: the duty cycle of the power control signal is adjusted based on the comparison.
In an embodiment, the adjusting the power control signal based on the comparison result includes: the frequency and duty cycle of the power control signal are adjusted based on the comparison.
The beneficial effects of the embodiment of the application are that: the power control circuit of the electromagnetic heating device comprises: a resonant circuit; the control circuit is connected with the resonant circuit and controls the resonant circuit to work based on the power control signal; the detection circuit is connected in a resonant circuit of the resonant circuit, is connected with the control circuit and is used for detecting the output power of the resonant circuit; the control circuit is further used for adjusting the power control signal based on the output power and the target power of the resonant circuit so as to control the resonant circuit to work by using the adjusted power control signal. This application can detect resonant circuit's output through the detection circuitry who connects in resonant circuit's resonant circuit, and adjust control circuit's power control signal based on resonant circuit's output and target power through control circuit, utilize the work of power control signal control resonant circuit after the adjustment, not only can make resonant circuit's output keep following its target power, realize effectual electromagnetic heating function, and can directly independently monitor (every) resonant circuit's output, carry out independent control to (every) resonant circuit's output, consequently, can improve power control's precision.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a block diagram of a power control circuit of an electromagnetic heating apparatus;
FIG. 2 is a block diagram of a power control circuit of the electromagnetic heating apparatus;
FIG. 3 is a schematic structural diagram of an embodiment of a power control circuit of the electromagnetic heating apparatus of the present application;
FIG. 4 is a schematic flow chart illustrating an embodiment of a power control method for an electromagnetic heating apparatus according to the present application;
FIG. 5 is a schematic structural diagram of an embodiment of a power control circuit of the electromagnetic heating apparatus of the present application;
FIG. 6 is a schematic flow chart illustrating an embodiment of a power control method for an electromagnetic heating apparatus according to the present application;
fig. 7 is a specific flowchart of step S61 in the embodiment of fig. 6.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
In the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In order to monitor and control the output power of the resonant circuit, the control circuit respectively controls the voltage detection circuit to collect the voltage of the power supply bus and controls the current detection circuit to collect the current of the power supply bus loop, as shown in fig. 1, the total input power of the resonant circuit is obtained based on the current and the voltage.
Since the electromagnetic heating device achieves electromagnetic heating based on the alternating magnetic field of the coil in the resonant circuit, the (heating) power of the electromagnetic heating device is approximately equivalent to the consumed power of the coil. Because the current of the power supply bus loop is not the current of the resonant circuit and the voltage of the power supply bus is not the voltage of the resonant circuit, the input total power cannot directly reflect the output power of the resonant circuit and the consumed power of the coil in the resonant circuit, and further cannot accurately control the power of the electromagnetic heating device.
Further, in the application scenario shown in fig. 2, the power obtained from the voltage of the power supply bus and the current of the power supply bus loop is the total input power, which cannot represent the output power of each resonant loop in the multiple resonant loops, and further cannot represent the power consumption of the coil in each resonant loop, so that the power consumption of each coil cannot be controlled based on the total input power.
To solve the above problems, the present application first provides a power control circuit of an embodiment of an electromagnetic heating device, as shown in fig. 3, and fig. 3 is a schematic structural diagram of an embodiment of the power control circuit of the electromagnetic heating device of the present application. The power control circuit (not shown) of the present embodiment includes: a resonance circuit 31, a control circuit 32, and a detection circuit 33; the control circuit 32 is connected to the resonant circuit 31, and controls the resonant circuit 31 to operate based on the power control signal; the detection circuit 33 is connected in the resonant tank of the resonant circuit 31, and is connected with the control circuit 32 for detecting the output power of the resonant tank; the control circuit 32 is further configured to adjust the power control signal based on the output power of the resonant tank and the target power of the resonant circuit 31, so as to control the resonant circuit 31 to operate by using the adjusted power control signal.
The control circuit 32 controls the detection circuit 33 to periodically collect the output power of the resonant circuit, compares the output power of the resonant circuit with the target power, adjusts the power control signal according to the comparison result, and controls the resonant circuit 31 to work by using the adjusted power control signal, so as to adjust the output power of the resonant circuit to be as close to the target power as possible, thereby enabling the electromagnetic heating device to realize an effective electromagnetic heating function.
Specifically, if the control circuit 32 determines that the output power of the resonant tank is greater than the target power, the frequency of the power control signal is increased and/or the duty ratio of the power control signal is decreased to reduce the output power of the resonant tank, and the next sampling period is entered; if the control circuit 32 determines that the output power of the resonant tank is smaller than the target power, the frequency of the power control signal is decreased and/or the duty ratio of the power control signal is increased to increase the output power of the resonant tank and enter the next sampling period; if the control circuit 32 determines that the output power of the resonant tank is equal to the target power, the power control signal is kept unchanged and the next sampling period is entered.
In the embodiment, the output power of the resonant circuit can be detected by the detection circuit 33 connected in the resonant circuit of the resonant circuit 31, the control circuit 32 adjusts the power control signal of the control circuit 32 based on the output power of the resonant circuit and the target power, and the adjusted power control signal is used for controlling the resonant circuit 31 to work, so that the output power of the resonant circuit keeps following the target power, an effective electromagnetic heating function is realized, the output power of (each) resonant circuit can be directly and independently monitored, the output power of (each) resonant circuit is independently controlled, and the accuracy of power control can be improved.
Optionally, the resonant circuit 31 of the present embodiment includes: a coil L and a resonant capacitor C; wherein, the first end of the coil L is connected with the detection circuit 33 and the control circuit 32; a first end of the resonant capacitor C is connected to a second end of the coil L, and a second end of the resonant capacitor C is connected to the detection circuit 33.
The resonant circuit 31 of the present embodiment is a series resonant circuit including a coil L and a resonant capacitor C. In other embodiments, the resonant circuit may also be a parallel resonant circuit, and the technical effect of this embodiment can also be achieved by appropriately adjusting the circuit structure.
Optionally, the detection circuit 33 of this embodiment includes: a voltage sampling circuit 331 and a current sampling circuit 332; the first acquisition end of the voltage sampling circuit 331 is connected with the first end of the coil L, the output end of the voltage sampling circuit 331 is connected with the control circuit 32, and the voltage sampling circuit 331 is used for acquiring the resonant voltage of the resonant circuit; the first collection end of the current sampling circuit 332 is connected with the second end of the resonant capacitor C, the second collection end of the current sampling circuit 332 is connected with the second collection end of the voltage sampling circuit 331, the output end of the current sampling circuit 332 is connected with the control circuit 32, and the current sampling circuit 332 is used for collecting resonant current of the resonant circuit. The control circuit 32 calculates the output power of the resonant tank based on the resonant voltage and the resonant current.
In an application scenario, the output power may be the average power of the resonant tank. Specifically, the control circuit 32 sets N sampling points in each sampling period, and the larger N is, the higher the sampling precision is; the control circuit 32 controls the voltage sampling circuit 331 to collect the resonance voltage of the resonance circuit at the corresponding N sampling points in each sampling period, and is marked as v (k); the control circuit 32 controls the current sampling circuit 332 to collect the resonant current of the resonant tank, i.e. the current of the coil L, at the corresponding N sampling points in each sampling period, and is denoted as i (k).
Since the loss of the resonant capacitor C is extremely small, the power (including the heat generation energy of electromagnetic heating) lost by the coil L is negligible. The power dissipated by the coil L per sampling period is then:
wherein, T is the time length of each sampling period, and when the bus voltage is a constant voltage, T may be the duty cycle of the half bridge; when the bus voltage is a non-constant voltage, T is the fluctuation period of the bus voltage. For example, if AC is 50Hz AC power, and after rectification, the frequency of bus voltage fluctuation is 100Hz, and the period is 10ms, then T is the fluctuation period of the bus voltage, i.e., 10 ms. Samples are taken every time period of T/N from the beginning of each sampling period. And sampling at least 100 times in each half-bridge sampling period; the average power per sampling period is: p is E/T.
In the embodiment, the fluctuation period of the bus voltage is taken as a sampling period, and the average power of each sampling period is calculated, so that the control fluctuation caused by instantaneous power fluctuation can be inhibited from being too fast.
In other application scenarios, the time length of the sampling period and the number of sampling points may be adjusted.
In the embodiment, the power control is performed by adopting the sampling period and the average power thereof, so that frequent adjustment of the power control signal can be avoided.
In other embodiments, the average power of the resonant tank is calculated in other ways, or other powers of the resonant tank are used instead of the average power.
For example, the resonant current and the resonant voltage of the resonant tank can be sampled at preset time intervals, the output power of the sampling point is obtained, and the power control signal is adjusted based on the output power.
The adjustment amount of the power control signal may be a preset amount or may be obtained based on a difference between the output power of the resonant tank and the target power.
The voltage sampling circuit 331 may be a resistor, and the current sampling circuit 332 may be a current transformer.
Optionally, the control circuit 32 of the present embodiment includes: a power regulating circuit 321 and a switch (not shown); the input end of the power adjusting circuit 321 is connected to the second end of the voltage sampling circuit 331 and the second end of the current sampling circuit 332, respectively, and is configured to calculate the output power of the resonant tank based on the resonant voltage of the voltage sampling circuit 331 and the resonant current of the current sampling circuit 332, and adjust the power control signal based on the output power of the resonant tank and the target power; the control end of the switch tube is connected with the power adjusting circuit 321, the communication end of the switch tube is connected with the second end of the coil L, and the switch tube is used for switching on and off under the control of the power control signal so as to adjust the output power of the resonant circuit.
The power regulating circuit 321 controls the switching tube to be periodically switched on and off through the power control signal, and the coil L is charged, oscillated and discharged in each period, so that a magnetic field with high-frequency change can be generated, and food and the like can be heated in an electromagnetic induction mode.
The control circuit 32 of this embodiment further includes a driving circuit 322, which is respectively connected to the power regulating circuit 321 and the control end of the switch tube, and is used to increase the driving force of the power regulating circuit 321 on the switch tube, so as to ensure the normal operation of the switch tube.
The control circuit 32 of the present embodiment includes a switching transistor Q1 and a switching transistor Q2, and the switching transistor Q1 and the switching transistor Q2 form a half-bridge inverter circuit. The first communication end of the switching tube Q1 is connected with the first power supply end, the second communication end of the switching tube Q1 is connected with the first communication end of the switching tube Q2, the second communication end of the switching tube Q2 is connected with the second power supply end, and the control end of the switching tube Q1 and the control end of the switching tube Q2 are connected with the driving circuit 322.
In an application scenario, as shown in fig. 4, after the power control is started, first, the power adjusting circuit 321 outputs a power control signal with a fixed frequency to the driving circuit 322, and the driving circuit 322 drives the switching tube Q1 and the switching tube Q2 to be alternately turned on according to the fixed frequency, so that the square wave voltage is loaded on the coil L and the resonant capacitor C, and the coil L starts to generate current and consume energy; starting at the 0 moment of each sampling period, the voltage sampling circuit 331 continuously samples the resonant voltage of the resonant tank for the duration of the interval T/N, and the current sampling circuit continuously samples the resonant current of the resonant tank for the duration of the interval T/N until the end of one sampling period; the power adjustment circuit 321 calculates the average power P of one sampling period that has just ended, and calculates the difference between the average power and the target power; if the difference is greater than 0, indicating that the output power is larger, outputting the frequency of the power increasing control signal; if the difference is 0, the output power reaches the target power, and the frequency of the power control signal is kept unchanged; if the difference is less than 0, the output power is smaller, and the frequency of the output power control signal is reduced; and continuously repeating the steps in the power control stage to enable the output power of the resonant circuit to always keep following the target power.
The switch tube of this embodiment is an N-MOS tube, the control end of which is a gate, the first communication end of which is a drain, and the second communication end of which is a source.
In other embodiments, a relay, a thyristor or an IGBT or other switching tubes can be used instead of the N-MOS tube; or the P-MOS transistor can replace the N-MOS transistor, and the circuit structure of the present embodiment is adaptively adjusted, so as to achieve the technical effect of the present embodiment.
The power conditioning circuit 321 of the present embodiment may be an integrated circuit chip having signal processing capability. The power conditioning circuit 321 may also be a general purpose processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The general purpose processor may be a microprocessor or the power conditioning circuit 321 may be any conventional processor or the like. The power regulating circuit 321 may be integrated on the hardware of the switching power supply, or may be integrated in the powered device.
Optionally, the power control circuit of this embodiment further includes: and a rectifying circuit 34 connected to the AC power supply AC and the switching tube, respectively, for rectifying AC power input from the AC power supply AC to obtain dc power and supplying the dc power to the switching tube.
The rectifier circuit 34 is a full-bridge rectifier circuit, and includes a first diode (not shown), a second diode (not shown), a third diode (not shown), and a fourth diode (not shown); the cathode of the first diode is connected with the cathode of the third diode, and the anode of the first diode is connected with the cathode of the second diode and the first power supply end of the alternating current power supply AC; the cathode of the fourth diode is connected with the anode of the third diode and the second power supply end of the alternating current power supply AC, and the anode of the fourth diode is connected with the anode of the second diode; the cathode of the third diode is connected to the first communication terminal of the switch Q1, and the anode of the fourth diode is connected to the second communication terminal of the switch Q2.
The rectifier circuit 34 converts the input ac power into dc power by turning on the first diode and the fourth diode at the same time and turning off the second diode and the third diode at the same time, or by turning off the first diode and the fourth diode at the same time and turning on the second diode and the third diode at the same time.
In other embodiments, a transistor, a field effect transistor, or the like may be used instead of the diode, or another circuit such as a half-bridge rectifier circuit may be used instead of the full-bridge rectifier circuit.
In other embodiments, the electromagnetic resonance control circuit may be powered by a dc power supply without a rectifier circuit.
Optionally, the power control circuit of this embodiment further includes: and the filter circuit (not shown) is respectively connected with the rectifying circuit and the switching tube, and is used for filtering the direct current, filtering out alternating current clutter in the direct current and providing the alternating current clutter for the switching tube. Specifically, the filter circuit of the present embodiment is a filter capacitor.
In another embodiment, as shown in fig. 5, the power control circuit of this embodiment is provided with two resonant tanks, so that independent detection and control of the output power of each resonant tank can be realized. Specifically, the power control circuit of the present embodiment includes two resonant circuits 31, two detection circuits 33, and two control circuits 32; a first end of a coil L of a resonant circuit 31 is connected to a detection circuit 33 and a control circuit 33, a first end of a resonant capacitor C of the resonant circuit 31 is connected to a second end of the coil L of the resonant circuit 31, and a second end of the resonant capacitor C of the resonant circuit 31 is connected to the detection circuit 33; a first end of the coil L of the further resonant circuit 31 is connected to the further detection circuit 33 and the further control circuit 32, a first end of the resonant capacitor C of the further resonant circuit 31 is connected to a second end of the coil L of the further resonant circuit 31, and a second end of the resonant capacitor C of the further resonant circuit 31 is connected to the further detection circuit 33.
For a specific connection circuit between the resonant circuit 31 and the corresponding detection circuit 33 in this embodiment, reference may be made to the above-mentioned embodiment, and for other circuit structures of the power control circuit in this embodiment, reference may also be made to the above-mentioned embodiment.
In this embodiment, different power adjusting circuits 321 are used to control the two resonant circuits 31, and of course, in other embodiments, the same power adjusting circuit 321 may be used to control the resonant circuits and the corresponding detecting circuits respectively.
In other embodiments, a plurality of resonant circuits may be disposed in the electromagnetic heating device to form a plurality of resonant circuits, and a plurality of detection circuits and a plurality of control circuits may be disposed in the electromagnetic heating device, and each resonant circuit may be controlled by a corresponding detection circuit for power detection and a corresponding control circuit.
Of course, the detection circuit of the present application may be used for power detection for each resonant tank, and a control circuit, a power supply circuit, and the like may be shared by a plurality of resonant tanks.
The electromagnetic heating device can be heating devices such as an electromagnetic rice cooker, an electromagnetic oven, an electromagnetic pressure cooker and an electromagnetic oven.
The present application further provides a power control method of an electromagnetic heating device, which can be used in the heating control circuit of the above embodiments, as shown in fig. 6, fig. 6 is a schematic flow chart of an embodiment of the power control method of the electromagnetic heating device of the present application. The power control method of the embodiment specifically includes the following steps:
step S61: the output power of the resonant tank of the resonant circuit is obtained.
The control circuit controls the detection circuit to periodically acquire the output power of the resonant circuit.
The output power of the resonant circuit can represent the consumed power of the coil in the resonant circuit, namely the heating power of the electromagnetic heating device.
Alternatively, the present embodiment may implement step S61 by using the method shown in fig. 7. The method of the present embodiment specifically includes steps S71 to S73:
step S71: a sampling period is obtained.
Step S72: and setting a plurality of sampling points in a sampling period, and acquiring the resonance voltage and the resonance current of the resonance circuit corresponding to the sampling points.
Step S73: and calculating the average power of the resonant circuit in the sampling period as the output power based on the plurality of resonant voltages and the plurality of resonant currents.
The steps S71 to S73 are also described:
the control circuit is provided with N sampling points in each sampling period, and the sampling precision is higher when N is larger; the control circuit controls the voltage sampling circuit to collect the resonance voltage of the resonance circuit at the corresponding N sampling points in each sampling period, and the resonance voltage is recorded as v (k); and the control circuit controls the current sampling circuit to acquire the resonance current of the resonance circuit, namely the current of the coil L at the corresponding N sampling points in each sampling period, and the current is recorded as i (k).
Since the loss of the resonant capacitor C is extremely small, the power (including the heat generation energy of electromagnetic heating) lost by the coil L is negligible. The power dissipated by the coil L per sampling period is then:
wherein, T is the time length of each sampling period, and when the bus voltage is a constant voltage, T may be the duty cycle of the half bridge; when the bus voltage is a non-constant voltage, T is the fluctuation period of the bus voltage. For example, if AC is 50Hz AC power, and after rectification, the frequency of bus voltage fluctuation is 100Hz, and the period is 10ms, then T is the fluctuation period of the bus voltage, i.e., 10 ms. Samples are taken every time period of T/N from the beginning of each sampling period. And sampling at least 100 times in each half-bridge sampling period; the average power per sampling period is: p is E/T.
In the embodiment, the fluctuation period of the bus voltage is taken as a sampling period, and the average power of each sampling period is calculated, so that the control fluctuation caused by instantaneous power fluctuation can be inhibited from being too fast.
In other application scenarios, the time length of the sampling period and the number of sampling points may be adjusted.
In the embodiment, the power control is performed by adopting the sampling period and the average power thereof, so that frequent adjustment of the power control signal can be avoided.
In other embodiments, the average power of the resonant tank is calculated in other ways, or other powers of the resonant tank are used instead of the average power.
For example, the resonant current and the resonant voltage of the resonant tank can be sampled at preset time intervals, the output power of the sampling point is obtained, and the power control signal is adjusted based on the output power.
The adjustment amount of the power control signal may be a preset amount or may be obtained based on a difference between the output power of the resonant tank and the target power.
Step S62: the output power is compared with a target power of the resonant circuit.
The control circuit obtains a difference between the output road and the target power.
Step S63: and adjusting the power control signal based on the comparison result so as to control the resonant circuit to work by using the adjusted power control signal.
If the difference value is larger than zero, adjusting the power control signal to reduce the output power of the resonant circuit; if the difference is less than zero, adjusting the power control signal to increase the output power of the resonant circuit; if the difference is equal to zero, the output power of the resonant tank is kept unchanged.
The embodiment detects the power consumed by the resonant circuit and the output power independently, so that the consumed power of each wire coil in the power control circuit can be controlled independently.
The application can detect the output power of the resonant circuit, and adjust the power control signal of the control circuit through the comparison result of the output power and the target power, and the adjusted power control signal is utilized to control the resonant circuit to work, so that the output power of the resonant circuit keeps following the target power, an effective electromagnetic heating function is realized, the output power of (each) resonant circuit can be directly and independently monitored, the output power of (each) resonant circuit is independently controlled, and the accuracy of power control can be improved.
Alternatively, the present embodiment may adjust the frequency of the power control signal based on the comparison result. Specifically, in response to the output power being greater than the target power, increasing the frequency of the power control signal such that the impedance of the resonant tank is increased, thereby causing the resonant current of the resonant tank to decrease, thereby causing the output power of the resonant tank to decrease; in response to the output power being less than the target power, reducing the frequency of the power control signal such that the impedance of the resonant tank is reduced, thereby increasing the resonant current of the resonant tank, and further increasing the output power of the resonant tank; the frequency of the power control signal is held constant in response to the output power being equal to the target power.
In another embodiment, the duty cycle of the power control signal may also be adjusted based on the comparison. In response to the output power being greater than the target power, reducing the duty cycle of the power control signal such that the voltage of the resonant tank is reduced, thereby causing the output power of the resonant tank to drop; in response to the output power being less than the target power, increasing the duty cycle of the power control signal such that the voltage of the resonant tank is increased, thereby causing the output power of the resonant tank to increase; the duty cycle of the power control signal is maintained constant in response to the output power being equal to the target power.
In another embodiment, the frequency and duty cycle of the power control signal may also be adjusted based on the comparison. The regulation principle can be combined with the regulation method of the frequency and the duty ratio.
The present application may employ the similar power control method described above for each of the power control circuits having multiple resonant circuits to detect the power inside each resonant tank, and achieve independent control of the power of each coil (or the output power of each half bridge).
Different from the prior art, this application electromagnetic heating device's power control circuit includes: a resonant circuit; the control circuit is connected with the resonant circuit and controls the resonant circuit to work based on the power control signal; the detection circuit is connected in a resonant circuit of the resonant circuit, is connected with the control circuit and is used for detecting the output power of the resonant circuit; the control circuit is further used for adjusting the power control signal based on the output power and the target power of the resonant circuit so as to control the resonant circuit to work by using the adjusted power control signal. This application can detect resonant circuit's output through the detection circuitry who connects in resonant circuit's resonant circuit, and adjust control circuit's power control signal based on resonant circuit's output and target power through control circuit, utilize the work of power control signal control resonant circuit after the adjustment, not only can make resonant circuit's output keep following its target power, realize effectual electromagnetic heating function, and can directly independently monitor (every) resonant circuit's output, carry out independent control to (every) resonant circuit's output, consequently, can improve power control's precision.
The above description is only an embodiment of the present application, and not intended to limit the scope of the present application, and all equivalent mechanisms or equivalent processes performed by the present application and the contents of the appended drawings, or directly or indirectly applied to other related technical fields, are all included in the scope of the present application.
Claims (11)
1. A power control circuit for an electromagnetic heating apparatus, comprising:
a resonant circuit;
the control circuit is connected with the resonant circuit and controls the resonant circuit to work based on a power control signal;
the detection circuit is connected in a resonant circuit of the resonant circuit, is connected with the control circuit and is used for detecting the output power of the resonant circuit;
the control circuit is further used for adjusting the power control signal based on the output power and the target power of the resonant circuit so as to control the resonant circuit to work by using the adjusted power control signal.
2. The power control circuit of claim 1, wherein the resonant circuit comprises:
a coil, a first end of which is connected with the detection circuit and the control circuit;
and a first end of the resonance capacitor is connected with the second end of the coil, and a second end of the resonance capacitor is connected with the detection circuit.
3. The power control circuit of claim 2, wherein the power control circuit comprises at least two of the resonant circuits, at least two of the detection circuits, and at least two of the control circuits;
a first end of a coil of the resonant circuit is connected with the detection circuit and the control circuit, a first end of a resonant capacitor of the resonant circuit is connected with a second end of the coil of the resonant circuit, and a second end of the resonant capacitor of the resonant circuit is connected with the detection circuit;
a first end of a coil of the other one of the resonance circuits is connected to the other one of the detection circuits and the other one of the control circuits, a first end of a resonance capacitor of the other one of the resonance circuits is connected to a second end of the coil of the other one of the resonance circuits, and a second end of the resonance capacitor of the other one of the resonance circuits is connected to the other one of the detection circuits.
4. The power control circuit of claim 2 or 3, wherein the detection circuit comprises:
a voltage sampling circuit, a first acquisition end of which is connected with the first end of the coil, and an output end of which is connected with the control circuit, and is used for acquiring the resonance voltage of the resonance circuit;
a first acquisition end of the current sampling circuit is connected with the second end of the resonant capacitor, a second acquisition end of the current sampling circuit is connected with the second acquisition end of the voltage sampling circuit, and an output end of the current sampling circuit is connected with the control circuit and is used for acquiring the resonant current of the resonant circuit;
the control circuit calculates an output power of the resonant tank based on the resonant voltage and the resonant current.
5. The power control circuit of claim 4, wherein the control circuit comprises:
a power adjusting circuit, an input end of which is connected to the second end of the voltage sampling circuit and the second end of the current sampling circuit, respectively, for calculating an output power of the resonant tank based on the resonant voltage and the resonant current, and adjusting the power control signal based on the output power and the target power;
and the control end of the switching tube is connected with the power regulating circuit, and the communication end of the switching tube is connected with the second end of the coil and is used for switching on and off under the control of the power control signal so as to regulate the output power of the resonant circuit.
6. A power control method for an electromagnetic heating apparatus, which is used in the power control circuit according to any one of claims 1 to 5, the power control method comprising:
acquiring the output power of a resonant circuit of the resonant circuit;
comparing the output power to a target power for the resonant circuit;
and adjusting the power control signal based on the comparison result so as to control the resonant circuit to work by using the adjusted power control signal.
7. The power control method of claim 6, wherein said obtaining the output power of the resonant tank of the resonant circuit comprises:
acquiring a sampling period;
setting a plurality of sampling points in the sampling period, and acquiring the resonance voltage and the resonance current of the resonance circuit corresponding to the sampling points;
calculating an average power of the resonant circuit in the sampling period as the output power based on the plurality of resonant voltages and the plurality of resonant currents.
8. The power control method of claim 6, wherein said adjusting the power control signal based on the comparison comprises:
adjusting a frequency of the power control signal based on the comparison result.
9. The power control method of claim 8, wherein the adjusting the frequency of the power control signal based on the comparison comprises:
in response to the output power being greater than the target power, increasing a frequency of the power control signal;
in response to the output power being less than the target power, reducing the frequency of the power control signal.
10. The power control method of claim 6, wherein said adjusting the power control signal based on the comparison comprises:
adjusting a duty cycle of the power control signal based on the comparison result.
11. The power control method of claim 6, wherein said adjusting the power control signal based on the comparison comprises:
adjusting a frequency and a duty cycle of the power control signal based on the comparison result.
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| CN202111555263.5A CN114390737B (en) | 2021-12-17 | 2021-12-17 | Power control circuit and power control method of electromagnetic heating device |
| PCT/CN2022/139374 WO2023109916A1 (en) | 2021-12-17 | 2022-12-15 | Power control circuit and power control method for electromagnetic heating device |
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| CN202111555263.5A CN114390737B (en) | 2021-12-17 | 2021-12-17 | Power control circuit and power control method of electromagnetic heating device |
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Cited By (1)
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| WO2023109916A1 (en) * | 2021-12-17 | 2023-06-22 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method for electromagnetic heating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117665382B (en) * | 2024-01-31 | 2024-04-05 | 季华实验室 | Power detection circuit and power detection PCB |
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| CN114390737B (en) | 2024-06-07 |
| WO2023109916A1 (en) | 2023-06-22 |
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