CN107544581A - A kind of Poewr control method of food processor - Google Patents
A kind of Poewr control method of food processor Download PDFInfo
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- CN107544581A CN107544581A CN201710864184.XA CN201710864184A CN107544581A CN 107544581 A CN107544581 A CN 107544581A CN 201710864184 A CN201710864184 A CN 201710864184A CN 107544581 A CN107544581 A CN 107544581A
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Abstract
The embodiment of the invention discloses a kind of Poewr control method of food processor, this method includes：During the heater for controlling food processor in a manner of default falling ripple computer heating control is operated, the operating voltage of food processor is detected；When it is rated voltage to detect operating voltage, control heater is with rated power PVolumeIt is operated；When it is not rated voltage to detect operating voltage, control heater works preset duration respectively on default multiple power corresponding with the first current operating voltage；Wherein, energy caused by the total duration that heater works on multiple power is equal to heater in rated power PVolumeEnergy caused by after the total duration that works.By scheme of the embodiment of the present invention, the heating power for precisely reliably adjusting heater according to voltage change in full voltage range is realized.
Description
Technical Field
The embodiment of the invention relates to a control technology of a food processor, in particular to a power control method of the food processor.
Background
Food processors (such as soymilk makers) in the market at present are generally designed to be used in a wide voltage range, and the national standard also requires that the food processors can normally work under the condition that the rated voltage of the food processors is 0.9 to 1.1 times. However, under different voltage conditions, the heating power of the heating device is different, and the influence on the pulping performance is different, so that the performance difference of the food processing machine is large under different voltage conditions, and the problems of pulp overflow, insufficient cooking and the like easily occur due to the higher or lower power of the heating device during abnormal voltage; moreover, because the heating power difference is great under the different voltages of food preparation machine, lead to food preparation machine heating time different, influence food preparation machine slurrying periodic stability, influence user experience.
At present, in order to ensure the reliability of food processor products, the high/medium/low voltage performance of the food processor needs to be tested, and the performance of the food processor is ensured to be qualified under different voltages. Therefore, the product testing period is prolonged, and the heating device of the food processor cannot ensure the consistency of heating power under different voltages, and the performance needs to adapt to a wide voltage range, so the design cost is high, and the development period is long.
In addition, to solve the heating device voltage adaptation problem, the heating device power is reduced at high voltage and increased at low voltage. In the prior art, the mode of adjusting the power of the heating device has no non-chopping control or wave-dropping control:
chopping and heating: the power of the heating device is controlled by controlling the size of the alternating current half-wave conduction angle, the power control is accurate, stepless power regulation can be realized, the power of the heating device can be ensured to be stable only by regulating the alternating current half-wave conduction angle to adapt to different voltages, but the defects are great, when the heating power is large (more than 500W), if chopped wave heating is used, great harmonic current disturbance (national standard has requirements on harmonic current) exists, a complex circuit is required to be additionally added to solve the problem of harmonic current, and the cost is very high;
wave dropping heating: the power of the heating device is controlled by controlling the conduction ratio of the alternating-current half waves, the power control device has the advantage of small harmonic current disturbance, and the power control device has the disadvantage of controlling only a few specific power gears, such as 3/4 power (conducting 3 half waves and closing 1 half wave). And the wave-dropping heating half-wave control period cannot be less than 1/5 (namely 1 half-wave is conducted, and 4 half-waves are closed), otherwise, the problem of voltage flicker is caused, and the national standard requirement is not met. Moreover, the prior art does not have a precise and reliable voltage self-adaptive method when the voltage changes.
Because chopping heating has a large harmonic current problem, and the problem that the harmonic current needs to be increased with very high cost is solved, the prior art basically uses a wave-dropping heating control mode to adjust the power of a heating device. The existing method for controlling the heating power to be adjusted along with the voltage by the wave-dropping control technology only has a plurality of gears such as P, 3/4P, 2/3P, 1/2P, 1/3P, 1/4P and the like because the power gear is single, the voltage gear is reduced at high voltage, the power gear is improved at low voltage, and the accurate and reliable heating power in the full voltage range cannot be ensured at all.
Disclosure of Invention
The embodiment of the invention provides a power control method of a food processor, which can accurately and reliably adjust the heating power of a heating device according to the voltage change in a full voltage range.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a method of power control of a food processor, the method comprising:
detecting the working voltage of the food processor in the process of controlling a heating device of the food processor to work in a preset wave-dropping heating control mode;
when the working voltage is detected to be the rated voltage, the heating device is controlled to have the rated power P Forehead (D) Carrying out work;
when the working voltage is detected to be not the rated voltage, controlling the heating device to work for a preset time length on a plurality of preset powers corresponding to the current first working voltage; wherein the total time period of the heating device working at a plurality of powers generates energy equal to the rated power P of the heating device Forehead (forehead) Energy generated after the total duration of operation.
Optionally, the plurality of powers comprises: a first power P1 and a second power P2 corresponding to a preset operating voltage range; the first working voltage conforms to a preset working voltage range;
the preset duration includes: a first duration T1 and a second duration T2 corresponding to the first power P1 and the second power P2, respectively.
Optionally, the controlling the heating device to respectively operate for a preset time length at a plurality of preset power gears corresponding to the current first operating voltage includes:
and when the working voltage is detected to be the first working voltage, controlling the heating device to work at the first power P1 for a first time period T1, and controlling the heating device to work at the second power P2 for a second time period T2.
Optionally, the total length of time that the heating means is operated at the plurality of powers generates energy equal to the rated power P of the heating means Forehead (forehead) The energy generated after the total working time is as follows:
P forehead (forehead) ×(T1+T2)＝P1×T1+P2×T2。
Optionally, when the working voltage within the preset working voltage range is greater than the rated voltage; the first power P1 and/or the second power P2 are/is lower than the rated power P Forehead (forehead) ；
When the working voltage within the preset working voltage range is less than the rated voltage; the first power P1 and/or the second power P2 are/is higher than the rated power P Forehead (forehead) 。
Optionally, the first power P1 and the second power P2 are determined according to a conduction half-wave ratio m in a control period in the wave-dropping heating control mode;
wherein, the first and the second end of the pipe are connected with each other,U forehead (forehead) Indicating rated voltage, U Fruit of Chinese wolfberry The actual working voltage is shown, n represents the wave-dropping ratio of the heating device, and T means that the control period of the alternating current half-wave is T alternating current half-waves.
Optionally, the determining of the first power P1 and the second power P2 according to the on-half wave ratio m in the control period in the wave-dropping heating control mode means:
if m is more than or equal to T, the first power P1 and the second power P2 are both rated power P Forehead (forehead) ；
If m is more than or equal to 3/4T, the first power P1 and the second power P2 are respectively the rated power P Forehead (forehead) And 3/4P Forehead (forehead) ；
If m is more than or equal to 2/3T, the first power P1 and the second power P2 are respectively 3/4P Forehead (forehead) And 2/3P Forehead (forehead) ；
If m is more than or equal to 1/2T, the first power P1 and the second power P2 are respectively 2/3P Forehead (forehead) And 1/2P Forehead (forehead) ；
If m is more than or equal to 1/3T, the first power P1 and the second power P2 are respectively 1/2P Forehead (forehead) And 1/3P Forehead (D) ；
If m is more than or equal to 1/4T, the first power P1 and the second power P2 are respectively 1/3P Forehead (forehead) And 1/4P Forehead (forehead) ；
If m < 1/4T, the first power P1 and the second power P2 are 0 and 1/4P respectively Forehead (forehead) 。
Optionally, the method further comprises:
acquiring a second wave-dropping ratio n2 and a third wave-dropping ratio n3 which respectively correspond to the first power P1 and the second power P2 according to the determined first power P1 and the second power P2;
respectively calculating a first time length T1 and a second time length T2 according to the conducting half wave ratio m, the second dropping wave ratio n2, the third dropping wave ratio n3 and the following equation:
optionally, the method further comprises: and controlling the heating device to work alternately at a first power P1 and a second power P2 in a control period.
Optionally, the method further comprises:
in the process of controlling the heating device to work, the actual working power P of the heating device is calculated in real time Fruit of Chinese wolfberry And the actual working power P is Fruit of Chinese wolfberry Comparing with the preset power P of the current stage; the preset power P of the current stage includes: rated power P Forehead (D) A first power P1 or a second power P2;
when actual operating power P Fruit of Chinese wolfberry When the current power is higher than the preset power P of the current stage, the current on half-wave ratio m is reduced toWhen the actual working power P Fruit of Chinese wolfberry When the current power is less than the preset power P of the current stage, the current on-state half-wave ratio m is increased to
The embodiment of the invention has the beneficial effects that:
1. in the embodiment of the invention, the working voltage of the food processor is detected in the working process of controlling the heating device of the food processor in a preset wave-dropping heating control mode; when the working voltage is detected to be the rated voltage, the heating device is controlled to have the rated power P Forehead (D) Carrying out work; when the working voltage is detected to be not the rated voltage, controlling the heating device to work for a preset time length on a plurality of preset powers corresponding to the current first working voltage; wherein the total time period of the heating device working at a plurality of powers generates energy equal to the rated power P of the heating device Forehead (D) Energy generated after the total duration of operation. Through the scheme of the embodiment, the heating power of the heating device can be accurately and reliably adjusted according to the voltage change in the full voltage range.
2. The method for controlling the heating device to respectively work for the preset duration on the plurality of preset power gears corresponding to the current first working voltage comprises the following steps: and when the working voltage is detected to be the first working voltage, controlling the heating device to work at the first power P1 for a first time period T1, and controlling the heating device to work at the second power P2 for a second time period T2. The total duration of operation of the heating means at a plurality of powers produces an energy equal to the nominal power P of the heating means Forehead (forehead) The energy generated after the total working time is as follows: p Forehead (D) X (T1 + T2) = P1 × T1+ P2 × T2. According to the scheme of the embodiment, on the basis of a limited heating power gear, two different power P1 and P2 combinations are adopted according to a voltage sampling value, and the aim that the heating power is equivalent to the rated heating power under an abnormal voltage is fulfilled by controlling the working time T1 and T2 of the two powers, so that the stability of the heating power of the food processor in a wide voltage range is ensured.
3. The inventionIn the embodiment, the first power P1 and the second power P2 are determined according to the conducting half-wave ratio m in the control period in the wave-dropping heating control mode; wherein the content of the first and second substances,U forehead (forehead) Indicating rated voltage, U Fruit of Chinese wolfberry The actual working voltage is shown, n represents the wave-dropping ratio of the heating device, and T means that the control period of the alternating current half-wave is T alternating current half-waves. Through the scheme of the embodiment, the consistency of the working power of the heating device and the power under the rated voltage can be ensured in the control period even if the voltage changes.
4. In the embodiment of the invention, the determination of the first power P1 and the second power P2 according to the conducting half-wave ratio m in the control period in the wave-dropping heating control mode refers to that: if m is more than or equal to T, the first power P1 and the second power P2 are both rated power P Forehead (forehead) (ii) a If m is more than or equal to 3/4T, the first power P1 and the second power P2 are respectively the rated power P Forehead (forehead) And 3/4P Forehead (forehead) (ii) a If m is more than or equal to 2/3T, the first power P1 and the second power P2 are respectively 3/4P Forehead (forehead) And 2/3P Forehead (forehead) (ii) a If m is more than or equal to 1/2T, the first power P1 and the second power P2 are respectively 2/3P Forehead (forehead) And 1/2P Forehead (forehead) (ii) a If m is more than or equal to 1/3T, the first power P1 and the second power P2 are respectively 1/2P Forehead (D) And 1/3P Forehead (D) (ii) a If m is more than or equal to 1/4T, the first power P1 and the second power P2 are respectively 1/3P Forehead (forehead) And 1/4P Forehead (forehead) (ii) a If m < 1/4T, the first power P1 and the second power P2 are 0 and 1/4P respectively Forehead (forehead) . According to the scheme of the embodiment, m alternating-current half-wave equivalent powers are conducted in the control period by combining the two powers P1 and P2, the conducting half-waves and the closing half-waves are distributed in a crossed mode, the thermal inertia influence of the heating device is reduced, and the heating effect is more accurate.
5. According to the embodiment of the invention, a second wave-dropping ratio n2 and a third wave-dropping ratio n3 which respectively correspond to the first power P1 and the second power P2 are obtained according to the determined first power P1 and the determined second power P2; respectively calculating a first time length T1 and a second time length T2 according to the conducting half wave ratio m, the second dropping wave ratio n2, the third dropping wave ratio n3 and the following equation:through the scheme of the embodiment, the consistency of the working power of the heating device and the power under the rated voltage can be further ensured even if the voltage changes in the control period.
6. The embodiment of the invention controls the heating device to alternately work at a first power P1 and a second power P2 in a control period. Through the scheme of the embodiment, the situation that the continuous working time of any one power is too long to influence the heating effect of the other power can be prevented, and the consistency of the heating effect is ensured.
Drawings
The embodiments of the present invention will be further described with reference to the accompanying drawings:
FIG. 1 is a flow chart of a method for controlling power of a food processor according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating the alternate operation of the first power P1 and the second power P2 according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Example one
A method of power control for a food processor, as shown in fig. 1, may include S101-S102:
s101, detecting the working voltage of the food processor during the working process of controlling the heating device of the food processor in a preset wave-dropping heating control mode.
In an embodiment of the present invention, during the operation of the food processor in the wave-dropping heating control mode, the set power gear may include:
1. rated power (i.e. full power) P Forehead (D) (AC half-wave full conduction), and controlling the wave-dropping ratio n =1;
2、3/4P forehead (forehead) (alternating current half-wave is switched on for 3 and is switched off for 1), and the wave dropping ratio n =3/4 is controlled;
3、2/3P forehead (D) (alternating current half-wave is switched on for 2 and is switched off for 1), and the wave dropping ratio n =2/3 is controlled;
4、1/2P forehead (forehead) (alternating current half-wave is switched on for 1 and is switched off for 1), and the wave dropping ratio n =1/2 is controlled;
5、1/3P forehead (forehead) (alternating current half-wave is switched on for 1 and switched off for 2), and the wave dropping ratio n =1/3 is controlled;
6、1/4P forehead (forehead) (alternating current half-wave is turned on for 1, and is turned off for 3), and the wave dropping ratio n =1/4 is controlled.
In the embodiment of the invention, according to the voltage value and the wave-dropping heating control method of the heating device, the heating power control can be realized by utilizing different wave-dropping ratio combinations, so that the effective values of the heating tube power under different voltages are ensured to be unchanged, and the reliability of the heating effect is ensured. In addition, the technical scheme adopts a wave dropping control mode to realize equivalent heating power of the heating device under different voltages, compared with the current chopping heating control method, the harmonic current disturbance is small, and the national standard requirement can be met without any additional circuit.
S102, when the working voltage is detected to be the rated voltage, controlling the heating device to have the rated power P Forehead (forehead) Carrying out work; when the working voltage is detected to be not the rated voltage, controlling the heating device to work for a preset time length on a plurality of preset powers corresponding to the current first working voltage; wherein the total time period of the heating device working at a plurality of powers generates energy equal to the rated power P of the heating device Forehead (forehead) Energy generated after the total duration of operation.
Optionally, the plurality of powers may include: a first power P1 and a second power P2 corresponding to a preset operating voltage range; the first working voltage conforms to a preset working voltage range;
the preset duration includes: a first duration T1 and a second duration T2 corresponding to the first power P1 and the second power P2, respectively.
In the embodiment of the present invention, the preset operating voltage range may be divided by the above rated voltage, for example, a first operating voltage range in which the operating voltage is higher than the rated voltage and a second operating voltage range in which the operating voltage is lower than the rated voltage. And the plurality of powers corresponding to the first operating voltage range may include P1-1 and P2-1; the plurality of powers corresponding to the first operating voltage range may include P1-2 and P2-2. Further, the time lengths corresponding to P1-1 and P2-1, respectively, may be T1-1 and T2-1; the time periods corresponding to P1-2 and P2-2, respectively, may be T1-2 and T2-2.
Optionally, the controlling the heating device to respectively operate for a preset time length at a plurality of preset power gears corresponding to the current first operating voltage includes:
and when the working voltage is detected to be the first working voltage, controlling the heating device to work at the first power P1 for a first time period T1, and controlling the heating device to work at the second power P2 for a second time period T2.
In the embodiment of the invention, when the first operating voltage is detected to be in accordance with the first operating voltage range, the heating device can be controlled to operate at the power P1-1 for the time period T1-1, and the heating device can be controlled to operate at the power P2-1 for the time period T2-1. When the first operating voltage is detected to be in accordance with the second operating voltage range, the heating device is controlled to operate at the power P1-2 for a time period T1-2, and the heating device is controlled to operate at the power P2-2 for a time period T2-2.
Optionally, the total length of time that the heating means is operated at the plurality of powers generates energy equal to the rated power P of the heating means Forehead (forehead) The energy generated after the total working time is as follows:
P forehead (forehead) ×(T1+T2)＝P1×T1+P2×T2。
Optionally, when the working voltage in the preset working voltage range is greater than the rated voltage; the first power P1 and/or the second power P2 are/is lower than the rated power P Forehead (forehead) ；
When the working voltage within the preset working voltage range is less than the rated voltage; the first power P1 and/or the second power P2 are/is higher than the rated power P Forehead (forehead) 。
In the embodiment of the invention, the control period of the alternating-current half-wave is T (specifically, the control period of the alternating-current half-wave comprises T alternating-current half-waves), T can be selectively set to 120 alternating-current half-waves, and when the working voltage of the food processor is the rated voltage, the main control unit MCU can drive the control device to set the power gear P Forehead (forehead) Controlling the heating device to work; when the working voltage of the food processor is above the rated voltage, the MCU can drive the control device to control the heating device to work at a smaller power, wherein at least one of the power P1-1 and the power P2-1 is smaller than the rated power P Forehead (D) The total working time of P1-1 and P2-1 is T1-1+ T2-1; when the food processor works below the rated voltage, the MCU drive control device controls the heating device to work at a larger power, wherein at least one of the power P1-2 and the power P2-2 is larger than the rated power P Forehead (forehead) And the total working time of P1-2 and P2-2 is T1-2+ T2-2.
In the embodiment of the invention, the actual average power of the heating device is kept the same as the rated voltage in the control period under the abnormal voltage, namely P is kept Forehead (forehead) X (T1-1 T2-1) = P1-1 xT 1-1+ P2-1 xT 2-1, or, P Forehead (forehead) ×(T1-2+T2-2)＝P1-2×T1-2+P2-2×T2-2。
In the embodiment of the invention, on the basis of limited heating power gears, different combinations of two powers P1 and P2 are adopted according to voltage sampling values, and the aim that the heating power is equivalent to the heating power of a rated voltage under an abnormal voltage is achieved by controlling the working time T1 and T2 of the two powers, so that the stability of the heating power of the food processor in a wide voltage range is ensured.
In addition, because the time points of the food processor in the pulping process, which are easy to overflow pulp, are all in the low-power heating stage, although the method for adjusting the heating power according to the voltage cannot enable the low-voltage rated power to be equivalent to the medium-voltage rated power (the maximum power of the heating pipe is reduced along with the voltage), the low-power heating power equivalent in a wide voltage range can be realized, and the problem that the food processor overflows in the low-power heating anti-overflow stage or the low-power boiling stage due to the fact that the heating power is higher due to the abnormal mains supply voltage in the current food processor is solved; the problem that when the voltage of the food processor is abnormal, the low-power heating power is too low, so that the food processor is not cooked well, and a user drinks the uncooked food to harm the health of the user is also solved.
The heating power of the food processor is stable and reliable in a wide voltage range, the performance consistency of the food processor in the wide voltage range can be ensured, a large number of performance tests for different voltages are not required in the development process of the food processor, and the test period and the development cost are reduced. And the technical scheme ensures that the heating effect under the abnormal voltage is equivalent to that under the rated voltage, shortens the test period under the abnormal condition and further saves the development cost. And the problems that the power of the heating device is higher or lower easily to cause pulp overflow, the cooking is not done and the like during abnormal voltage are solved.
In the embodiment of the invention, the stability of the heating power of the food processor in a wide voltage range is realized only by the limited 6 power gears of the wave-dropping heating, and compared with the current wave-dropping heating control technology, the power control is more accurate; compared with a chopping wave heating control technology, the harmonic current disturbance is low; the problem of current technology can't be through falling the ripples heating accurate control heating pipe power reliable and stable at full voltage range is solved. Furthermore, in the technical scheme, the heating power of the food processor is stable in a wide voltage range, the heating period is stable and reliable, the stability and the reliability of the pulping period of the food processor in a full voltage range are ensured, and the user experience is improved.
Example two
The embodiment further defines the manner of obtaining the first power P1 and the second power P2 on the basis of the first embodiment.
Optionally, the first power P1 and the second power P2 are determined according to a conduction half-wave ratio m in a control period in the wave-dropping heating control mode;
wherein the content of the first and second substances,U forehead (forehead) Indicating rated voltage, U Fruit of Chinese wolfberry The actual working voltage is shown, n is the wave dropping ratio of the heating device, and T is the control period of the alternating current half waves and is T alternating current half waves.
In the embodiment of the invention, the food processor controls heating by taking T alternating current half-waves as a period, and the rated voltage AD value V of the food processor 0 Real time voltage AD value V 1 If the wave-dropping ratio of the heating power P is n and the resistance value of the heating device is R, then when the voltage is the rated voltage V 0 When the temperature of the water is higher than the set temperature,within the control period T there areWhen the real-time AC voltage sampling AD is V 1 In order to ensure that the power of the heating pipe is not changed, the requirement of constant power of the heating pipe must be metAnd the power of the heating pipe is consistent with the power under the rated voltage even if the voltage changes in the control period T.
In the embodiment of the invention, theSubstitution intoTherefore, the following steps are carried out: namely, it isWhen the voltage is V 1 In the period T, m half-wave conduction is controlled to ensure the heating pipe power and the rated voltage V 0 The time is consistent.
In the embodiment of the invention, although in theory, the alternating current half-wave can be directly controlled to continuously conduct m alternating current half-waves, and then the T-m half-waves are closed to realize power equivalence. However, when the wide voltage range is compatible, the range of the alternating-current half-wave control period T is large, and the heating effect of the heating pipe is affected by thermal inertia, so in order to ensure the consistency of the heating effect of the heating pipe under different voltages, the technical scheme adopts the combination of two powers P1 and P2 to realize that m alternating-current half-wave equivalent powers are switched on in the control period T altogether, the switching-on half-waves and the switching-off half-waves are distributed in a crossed manner to reduce the thermal inertia effect of the heating pipe, and the heating effect is ensured to be more accurate.
In the embodiment of the invention, for example, when the heating pipe with the power of 1000W under the rated voltage is set to be half-power heating P =500W, n =1/2,V 0 =220V. When the voltage is changed to 242V, in order to ensure that the heating power of the heating pipe is not changed, the heating pipe needs to be conducted within the control period T =100 alternating-current half wavesThe heating power of the heating pipe under 242V can be ensured to be 500W only by the alternating-current half wave.
In the embodiment of the invention, because T =100 alternating current half-wavenumbers m =41With m being greater thanThen it can pass throughThe control circuit works for a certain time respectively to realize the conduction of m =41 alternating current half waves in the alternating current half wave control period T = 100.
In the embodiment of the present invention, when the combined power P1 and P2 is an adjacent power stage in the power stage, for example, m =41, the combined power P1 and P2 may also be passedThe control circuit works for a certain time respectively to realize the conduction of m =41 alternating current half waves in the alternating current half wave control period T = 100. But preferablyThe combination is to prevent the heating effect consistency of the heating pipe from being poor due to the fact that the heating effect is influenced by thermal inertia when the power gears are switched with each other due to overlarge power difference value.
In the embodiment of the present invention, the following first power P1 and second power P2 value schemes may be obtained based on the above theory.
Optionally, the determining of the first power P1 and the second power P2 according to the on-half wave ratio m in the control period in the wave-dropping heating control mode means:
if m is more than or equal to T, the first power P1 and the second power P2 are both rated power P Forehead (forehead) ；
If m is more than or equal to 3/4T, the first power P1 and the second power P2 are respectively the rated power P Forehead (forehead) And 3/4P Forehead (forehead) ；
If m is more than or equal to 2/3T, the first power P1 and the second power P2 are respectively 3/4P Forehead (D) And 2/3P Forehead (D) ；
If m is more than or equal to 1/2T, the first power P1 and the second power P2 are respectively 2/3P Forehead (forehead) And 1/2P Forehead (forehead) ；
If m is more than or equal to 1/3T, the first power P1 and the second power P2 are respectively 1/2P Forehead (forehead) And 1/3P Forehead (forehead) ；
If m is more than or equal to 1/4T, the first power P1 and the second power P2 are respectively 1/3P Forehead (forehead) And 1/4P Forehead (D) ；
If m < 1/4T, the first power P1 and the second power P2 are 0 and 1/4P respectively Forehead (forehead) 。
EXAMPLE III
The embodiment further defines the manner of acquiring the first time length T1 and the second time length T2 on the basis of the first embodiment and the second embodiment.
In the embodiment of the invention, the working time T1 and T2 of the heating power P1 and P2 can control the wave-dropping ratio n according to the heating power P1 and P2 1 、n 2 And m value confirmation, can be specifically realized by the following scheme.
Optionally, the method may further include:
acquiring a second wave-dropping ratio n2 and a third wave-dropping ratio n3 which respectively correspond to the first power P1 and the second power P2 according to the determined first power P1 and the second power P2;
respectively calculating a first time length T1 and a second time length T2 according to the conducting half-wave ratio m, the second dropping-wave ratio n2, the third dropping-wave ratio n3 and the following equation:
in the embodiment of the invention, if the heating control period is T, the rated voltage is V 0 The set power P (the controlled clip ratio is n) is known. Then according toAfter the heating power P1 and P2 are determined, the wave-dropping ratio n can be controlled according to the heating power P1 and the heating power P2 1 、n 2 Determining the operating time of the Power P1Operating time of power P2
In the embodiment of the invention, the wave-dropping ratio n of the heating power P1 and P2 is controlled 1 、n 2 As is known, the operating time T1 of the power P1 and the operating time T2 of the power P2 are set. Then T1, T2 must satisfy:
T＝T 1 +T 2 equation 1
The heating control period T is ensured to be unchanged. Meanwhile, in order to ensure that the set power P is consistent with the set power under the rated voltage, the number of the conduction semi-wave in the control period T is m, and then
m＝T1*n 1 +T2*n 2 Equation 2
I.e. the half wave number of the on-state of the power P1 in the period T1 is T1 x n 1 During the period T2, the power P2 is conducted with a half wave number of T2 n 2 The total number of half-waves for turning on the power P1 and the power P2 must be m, so that the power under the abnormal voltage is equivalent to the rated voltage condition.
The working time of the power P1 can be calculated by solving the equation of once two variables according to the formula 1 and the formula 2Operating time of power P2
Example four
This embodiment further defines the operation of the first power P1 and the second power P2 on the basis of any of the above embodiments.
Optionally, the method may further include: and controlling the heating device to work alternately at a first power P1 and a second power P2 in a control period.
In the embodiment of the present invention, in the control period T, the total working time of the power P1 and the power P2 is T1 and T2, respectively, and the working mode may be that the power P1 and the power P2 work alternately. For example, T =100 ac half-waves,m＝41，T 1 ＝46、T 2 =54, the control period of P1 is 2 ac half-waves: the control period of the switch 1, the switch P2 is 3 ac half-waves: switch 1 and switch 2.
In the embodiment of the present invention, as shown in fig. 2, in the control period T, the heating control manner may include:
power P1: controlling an alternating current half-wave switch 1 to switch 1;
power P2: controlling an alternating current half-wave switch 1 and a switch 2;
circulation ofAfter each period;
power P 1 : controlling an alternating current half-wave switch 1 to switch 1;
circulation ofAnd (4) one period.
In the embodiment of the invention, although the target power is realized by preferably combining the adjacent two power levels P1 and P2, and the influence of the thermal inertia of the heating device on the heating effect is reduced, even if the adjacent two power levels exist, the power of the heating device still has a certain deviation, so the two power levels are alternately controlled by the technical scheme, the heating effect of the other power level is prevented from being influenced by overlong continuous working time of any power level, and the consistency of the heating effect is ensured.
EXAMPLE five
On the basis of any of the above embodiments, the current power value is calculated by using current detection and voltage detection, so that closed-loop control of the heating power is realized.
Optionally, the method may further include:
during the control of the heating device, the actual working power P of the heating device is calculated in real time Fruit of Chinese wolfberry And the actual working power P is Fruit of Chinese wolfberry Comparing with the preset power P of the current stage; the preset power P of the current stage includes: rated power P Forehead (forehead) A first power P1 or a second power P2;
when actual operating power P Fruit of Chinese wolfberry When the current power is higher than the preset power P of the current stage, the current on half-wave ratio m is reduced toWhen the actual working power P Fruit of Chinese wolfberry When the current power is less than the preset power P of the current stage, the current on-state half-wave ratio m is increased to
In the embodiment of the invention, during the heating process, the effective voltage value V in the control period T is detected by using voltage detection, the effective current value I in the control period T is detected by using current detection, and the effective current value I is detected according to P Fruit of Chinese wolfberry And calculating the actual power in the control period T and comparing the actual power with the set power P.
When P is present Fruit of Chinese wolfberry &When P is greater than the value of mWhen P is present Fruit of Chinese wolfberry &At P, the value of m increases toAnd then controlling the power P1 and the power P2 to work according to the value m.
In the embodiment of the invention, the current actual working power P can also be used Fruit of Chinese wolfberry Setting a maximum threshold (e.g., 1.5P) and a minimum threshold (e.g., 0.5P) when the power P is high Fruit of Chinese wolfberry >, 1.5P or when P Fruit of Chinese wolfberry &And (t) 0.5P, the control circuit or the heating device is considered to be abnormal, and alarm prompt can be carried out.
In the embodiment of the invention, the actual power of the heating device is controlled in a closed loop mode according to the current detection and the voltage detection, so that the reliability of the heating effect is ensured. Meanwhile, when the heating power is abnormally large or small due to the fact that the heating device or the control circuit is abnormal, the heating device or the control circuit can be effectively identified, and a user is prompted by an alarm, so that the heating device is further guaranteed to work reliably.
The embodiment of the invention has the beneficial effects that:
1. in the embodiment of the invention, the working voltage of the food processor is detected in the working process of controlling the heating device of the food processor in a preset wave-dropping heating control mode; when the working voltage is detected to be the rated voltageControlling the heating device to a rated power P Forehead (D) Carrying out work; when the working voltage is detected to be not the rated voltage, controlling the heating device to work for a preset time length on a plurality of preset powers corresponding to the current first working voltage; wherein the total time period of the heating device working at a plurality of powers generates energy equal to the rated power P of the heating device Forehead (forehead) Energy generated after the total duration of operation. Through the scheme of the embodiment, the heating power of the heating device can be accurately and reliably adjusted according to the voltage change in the full voltage range.
2. The method for controlling the heating device to respectively work for the preset duration on the plurality of preset power gears corresponding to the current first working voltage comprises the following steps: and when the working voltage is detected to be the first working voltage, controlling the heating device to work at the first power P1 for a first time period T1, and controlling the heating device to work at the second power P2 for a second time period T2. The total duration of operation of the heating means at a plurality of powers produces an energy equal to the nominal power P of the heating means Forehead (D) The energy generated after the total working time is as follows: p Forehead (D) X (T1 + T2) = P1 × T1+ P2 × T2. According to the scheme of the embodiment, on the basis of a limited heating power gear, two different power P1 and P2 combinations are adopted according to a voltage sampling value, and the aim that the heating power is equivalent to the rated heating power under an abnormal voltage is fulfilled by controlling the working time T1 and T2 of the two powers, so that the stability of the heating power of the food processor in a wide voltage range is ensured.
3. According to the embodiment of the invention, a first power P1 and a second power P2 are determined according to a conducting half-wave ratio m in a control period in a wave-dropping heating control mode; wherein the content of the first and second substances,U forehead (D) Indicating rated voltage, U Fruit of Chinese wolfberry The actual working voltage is shown, n represents the wave-dropping ratio of the heating device, and T means that the control period of the alternating current half-wave is T alternating current half-waves. Through the scheme of the embodiment, the consistency of the working power of the heating device and the power under the rated voltage can be ensured even if the voltage changes in the control period.
4. In the embodiment of the invention, the determination of the first power P1 and the second power P2 according to the conducting half-wave ratio m in the control period in the wave-dropping heating control mode refers to that: if m is more than or equal to T, the first power P1 and the second power P2 are both rated power P Forehead (forehead) (ii) a If m is more than or equal to 3/4T, the first power P1 and the second power P2 are respectively the rated power P Forehead (D) And 3/4P Forehead (forehead) (ii) a If m is more than or equal to 2/3T, the first power P1 and the second power P2 are respectively 3/4P Forehead (forehead) And 2/3P Forehead (forehead) (ii) a If m is more than or equal to 1/2T, the first power P1 and the second power P2 are respectively 2/3P Forehead (forehead) And 1/2P Forehead (D) (ii) a If m is more than or equal to 1/3T, the first power P1 and the second power P2 are respectively 1/2P Forehead (forehead) And 1/3P Forehead (forehead) (ii) a If m is more than or equal to 1/4T, the first power P1 and the second power P2 are respectively 1/3P Forehead (forehead) And 1/4P Forehead (forehead) (ii) a If m < 1/4T, the first power P1 and the second power P2 are 0 and 1/4P respectively Forehead (forehead) . According to the scheme of the embodiment, m alternating-current half-wave equivalent powers are conducted in the control period by combining the two powers P1 and P2, the conducting half-waves and the closing half-waves are distributed in a crossed mode, the thermal inertia influence of the heating device is reduced, and the heating effect is more accurate.
5. According to the embodiment of the invention, a second wave-dropping ratio n2 and a third wave-dropping ratio n3 which respectively correspond to the first power P1 and the second power P2 are obtained according to the determined first power P1 and the determined second power P2; respectively calculating a first time length T1 and a second time length T2 according to the conducting half-wave ratio m, the second dropping-wave ratio n2, the third dropping-wave ratio n3 and the following equation:through the scheme of the embodiment, the consistency of the working power of the heating device and the power under the rated voltage can be further ensured even if the voltage changes in the control period.
6. The embodiment of the invention controls the heating device to alternately work at a first power P1 and a second power P2 in a control period. Through the scheme of the embodiment, the situation that the continuous working time of any one power is too long and the heating effect of the other power is influenced can be prevented, and the consistency of the heating effect is ensured.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of power control for a food processor, the method comprising:
detecting the working voltage of the food processor in the process of controlling a heating device of the food processor to work in a preset wave-dropping heating control mode;
when the working voltage is detected to be the rated voltage, controlling the heating device to have the rated power P Forehead (forehead) Carrying out work;
when the working voltage is detected not to be the rated voltage, controlling the heating device to respectively work at a plurality of preset powers corresponding to the current first working voltage for a preset time; wherein the total length of time that the heating device is operated at the plurality of power levels produces an energy equal to the rated power P of the heating device Forehead (forehead) Energy generated after operating the total time period.
2. The method of claim 1, wherein the step of controlling the power of the food processor comprises the step of,
the plurality of powers includes: a first power P1 and a second power P2 corresponding to a preset operating voltage range; wherein the first working voltage conforms to the preset working voltage range;
the preset duration comprises: a first duration T1 and a second duration T2 corresponding to the first power P1 and the second power P2, respectively.
3. The method of claim 2, wherein controlling the heating device to operate at the predetermined plurality of power steps corresponding to the current first operating voltage for the predetermined duration comprises:
and when the working voltage is detected to be the first working voltage, controlling the heating device to work at the first power P1 for a first time period T1, and controlling the heating device to work at the second power P2 for a second time period T2.
4. A method as claimed in claim 3, characterized in that the total time during which the heating means are operated at the plurality of powers generates an energy which is equal to the nominal power P of the heating means Forehead (forehead) The energy generated after the operation of the total time duration is as follows:
P forehead (forehead) ×(T1+T2)＝P1×T1+P2×T2。
5. The method of power control of a food processor according to any one of claims 2-4,
when the working voltage within the preset working voltage range is larger than the rated voltage; the first power P1 and/or the second power P2 are/is lower than the nominal power P Forehead (forehead) ；
When the working voltage within the preset working voltage range is less than the rated voltage; the first power P1 and/or the second power P2 are/is higher than the rated power P Forehead (forehead) 。
6. A method as claimed in any one of claims 2 to 4, wherein the first power P1 and the second power P2 are determined in dependence on a conduction half-wave ratio m during a control period of the lost-wave heating control regime;
wherein the content of the first and second substances,U forehead (forehead) Represents the rated voltage, U Fruit of Chinese wolfberry Representing the actual operating voltage, n representing the heating deviceT means that the control period of the ac half-wave is T ac half-waves.
7. A power control method for a food processor as defined in claim 6, wherein the determining of the first power P1 and the second power P2 according to the on-half wave ratio m in the control period of the wave-dropping heating control mode means:
if m is more than or equal to T, the first power P1 and the second power P2 are both the rated power P Forehead (D) ；
If m is more than or equal to 3/4T, the first power P1 and the second power P2 are the rated power P respectively Forehead (forehead) And 3/4P Forehead (forehead) ；
If m is more than or equal to 2/3T, the first power P1 and the second power P2 are respectively 3/4P Forehead (forehead) And 2/3P Forehead (forehead) ；
If m is more than or equal to 1/2T, the first power P1 and the second power P2 are respectively 2/3P Forehead (forehead) And 1/2P Forehead (D) ；
If m is more than or equal to 1/3T, the first power P1 and the second power P2 are respectively 1/2P Forehead (forehead) And 1/3P Forehead (forehead) ；
If m is more than or equal to 1/4T, the first power P1 and the second power P2 are respectively 1/3P Forehead (forehead) And 1/4P Forehead (forehead) ；
If m is less than 1/4T, the first power P1 and the second power P2 are respectively 0 and 1/4P Forehead (forehead) 。
8. The method of power control of a food processor of claim 7, further comprising:
acquiring a second wave-dropping ratio n2 and a third wave-dropping ratio n3 corresponding to the first power P1 and the second power P2 respectively according to the determined first power P1 and the second power P2;
respectively calculating the first time length T1 and the second time length T2 according to the on half wave ratio m, the second dropping wave ratio n2, the third dropping wave ratio n3 and the following equation:
9. the method of power control of a food processor of claim 6, further comprising: controlling the heating device to work alternately at the first power P1 and the second power P2 in the control period.
10. The method of power control of a food processor of claim 6, further comprising:
calculating the actual working power P of the heating device in real time in the process of controlling the heating device to work Fruit of Chinese wolfberry And applying said actual operating power P Fruit of Chinese wolfberry Comparing with the preset power P of the current stage; the preset power P of the current stage comprises: rated power P Forehead (D) A first power P1 or a second power P2;
when the actual working power P Fruit of Chinese wolfberry When the current power is larger than the preset power P of the current stage, the current on-state half-wave ratio m is reduced toWhen the actual working power P Fruit of Chinese wolfberry When the current power is less than the preset power P of the current stage, the current on-state half-wave ratio m is increased to
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