CN115462695A - Motor monitoring method for food processor - Google Patents
Motor monitoring method for food processor Download PDFInfo
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- CN115462695A CN115462695A CN202211069740.1A CN202211069740A CN115462695A CN 115462695 A CN115462695 A CN 115462695A CN 202211069740 A CN202211069740 A CN 202211069740A CN 115462695 A CN115462695 A CN 115462695A
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
- A47J43/07—Parts or details, e.g. mixing tools, whipping tools
- A47J43/075—Safety devices
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Abstract
The embodiment of the invention discloses a motor monitoring method of a food processor, which comprises the following steps: the main control circuit is connected with a power supply, a switch, a detection circuit and a motor driving circuit in sequence; the detection signal output end of the detection circuit is connected with the signal input end of the main control circuit, and the method comprises the following steps: the switch comprises a closed state and an open state; when the switch is in an off state, acquiring a voltage value of the signal input end, which can judge whether the motor has poor voltage resistance; when the voltage value is zero, determining that the motor has no bad withstand voltage phenomenon; and when the voltage value is larger than zero and smaller than a preset voltage threshold value, determining that the motor has poor withstand voltage. The scheme of the embodiment can timely and effectively detect the bad withstand voltage phenomenon of the motor and timely process the motor. When the switch is disconnected, the voltage-resistant state of the motor is monitored, the influence of the working state of the motor is reduced, and the monitoring is more accurate.
Description
The application is a divisional application proposed in article 42 of the rules for implementing patent laws, and the original application is the application with the application number of 201910547284.9 and the name of 'a motor monitoring method of a food processor' which is submitted in 24.6.2019.
Technical Field
The embodiment of the invention relates to a motor detection technology, in particular to a motor monitoring method of a food processor.
Background
At present, most motors adopted by food processing machines (such as soybean milk machines) are brush motors, the motors work by adopting carbon brush reversing, a large amount of carbon powder can be generated due to the abrasion of the carbon brush after working time is long, the carbon powder can cause the voltage resistance of the motors to be poor after being accumulated seriously, the ignition is serious during working, even the tripping operation and other abnormalities can be caused, and no effective detection scheme is provided for the voltage resistance problem of the motors at present.
Disclosure of Invention
The embodiment of the invention provides a motor monitoring method of a food processor, which can effectively detect the phenomenon of poor withstand voltage of a motor in time and process the motor in time.
To achieve the object of the embodiments of the present invention, the embodiments of the present invention provide a motor monitoring method for a food processor, wherein the food processor comprises: the main control circuit is connected with a power supply, a switch, a detection circuit and a motor driving circuit in sequence; the detection signal output end of the detection circuit is connected with the signal input end of the main control circuit, the first end of the switch is connected with the zero line of the power supply, and the second end of the switch is connected with the detection signal input end of the detection circuit; the method comprises the following steps:
the switch comprises a closed state and an open state;
when the switch is in an off state, acquiring a voltage value of the signal input end, which can judge whether the motor has poor voltage resistance;
when the voltage value is zero, determining that the motor has no voltage withstanding phenomenon;
and when the voltage value is larger than zero and smaller than a preset voltage threshold value, determining that the motor has poor withstand voltage.
In an exemplary embodiment of the invention, the method further comprises: the opening and closing of the switch are controlled by the opening and closing of the cup cover of the food processor.
In an exemplary embodiment of the invention, the switch is a magnetically controlled microswitch.
In an exemplary embodiment of the present invention, the detection circuit includes: the circuit comprises a diode, a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor, a triode, a first filter capacitor, a second filter capacitor and a pull-up resistor.
In an exemplary embodiment of the present invention, the diode, the first voltage-dividing resistor, the second voltage-dividing resistor, the third voltage-dividing resistor, and the fourth voltage-dividing resistor are sequentially connected in series; an anode of the diode is a detection signal input end of the detection circuit, a first end of the fourth divider resistor is connected with the third divider resistor, and a second end of the fourth divider resistor is connected with a signal ground SGND;
the first filter capacitor is connected with the fourth divider resistor in parallel;
an emitting electrode of the triode is connected with a first end of the fourth voltage-dividing resistor, a base electrode of the triode is connected with the SGND, and a collector electrode of the triode is connected with a first end of the pull-up resistor;
the second end of the pull-up resistor is connected with a power supply; the second filter capacitor is connected in parallel between the base electrode and the collector electrode of the triode;
and the signal input end of the main control circuit is connected with the collector.
The beneficial effects of the embodiment of the invention can include:
1. the food processor of an embodiment of the invention may comprise: the main control circuit is connected with a power supply, a switch, a detection circuit and a motor driving circuit in sequence; the detection signal output end of the detection circuit is connected with the signal input end of the main control circuit, and the method can comprise the following steps: the switch comprises a closed state and an open state; when the switch is in an off state, acquiring a voltage value of the signal input end, which can be used for judging whether the motor has good withstand voltage; when the voltage value is zero, determining that the motor has no bad withstand voltage phenomenon; and when the voltage value is larger than zero and smaller than a preset voltage threshold value, determining that the motor has poor withstand voltage. The problem of poor withstand voltage of the motor can be judged by identifying the signal modulus AD value of the detection circuit. Furthermore, by utilizing the closing state and the opening state of the switch, the food processor is in a normal working state usually in the closing state, and the voltage resistance monitoring of the motor is reduced to ensure that the food processor is always in the normal working state; the withstand voltage of the motor is detected only in the off state, so that the influence on the accuracy of withstand voltage detection when the motor is in the working state is reduced, and the accuracy of withstand voltage detection is further improved.
2. The switch of the embodiment of the invention is a magnetic control microswitch; the method may further comprise: the magnetic control microswitch is controlled to be switched on and off by opening and closing the cup cover of the food processor. By the scheme of the embodiment, the magnetic control microswitch can be ensured to have the actions of closing and opening during pulping each time, so that the withstand voltage problem of the motor can be detected during pulping each time.
3. The food processor of an embodiment of the invention may comprise: the main control circuit is connected with a power supply, a switch, a detection circuit and a motor driving circuit in sequence; the detection signal output end of the detection circuit is connected with the signal input end of the main control circuit, and the method can comprise the following steps: after the switch is closed, acquiring a detection signal of the signal input end; determining a signal parameter of the detection signal; the signal parameters include any one or more of: duty cycle, pulse width, low level duration, and detected voltage value; determining whether the motor has poor withstand voltage phenomenon according to the change condition of the signal parameter; when the motor is determined to have the poor withstand voltage phenomenon, processing according to a preset processing scheme; the preset treatment scheme comprises any one or more of the following: alarming, controlling the motor to stop running and cutting off the power supply of the motor. Through the scheme of the embodiment, the voltage-resistant bad phenomenon of the motor can be timely and effectively detected, and the motor can be timely processed.
4. When the signal parameter is the duty ratio, the determining whether the motor has poor withstand voltage according to the change condition of the signal parameter may include: when the duty ratio is reduced, determining that the motor has poor withstand voltage; and when the duty ratio is not changed, determining that the motor has no bad withstand voltage phenomenon. The embodiment has simple scheme and easy implementation.
5. When the signal parameter is the pulse width, the determining whether the motor has a bad withstand voltage phenomenon according to the change condition of the signal parameter may include: when the pulse width is larger than a preset pulse width threshold value, determining that the motor has a poor withstand voltage phenomenon; and when the pulse width is less than or equal to the pulse width threshold value, determining that the motor has no bad withstand voltage phenomenon. The embodiment has high detection precision, ensures the correct detection of the withstand voltage problem of the motor, and avoids other abnormalities caused by continuous use after poor withstand voltage.
6. In the embodiment of the present invention, when the signal parameter is the low level continuous time, the determining whether the motor has a bad withstand voltage phenomenon according to the change condition of the signal parameter may include: when the duration of the low level is less than a preset duration threshold, determining that the motor has poor withstand voltage; and when the duration of the low level is greater than or equal to the duration threshold, determining that the motor has no bad withstand voltage phenomenon. Through the scheme of the embodiment, the detection circuit can be realized through the zero-crossing detection circuit, and the poor withstand voltage phenomenon of the motor can be detected through detecting the zero-crossing signal.
7. The first end of the switch is connected with a zero line of the power supply, and the second end of the switch is connected with a detection signal input end of the detection circuit; a rectifier bridge is arranged in the motor driving circuit, and the detection signal input end is directly connected with the rectifier bridge. By means of this embodiment, the power supply can be disconnected by opening the switch, so that the input of the detection circuit is switched to the circuit of the motor.
Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the embodiment of the application serve to explain the principles of the embodiments of the invention and not to limit the embodiments of the invention.
FIG. 1 is a flow chart of a method for monitoring a motor of a food processor according to an embodiment of the present invention;
FIG. 2 is a block diagram of the components of a food processor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a detecting circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an equivalent circuit when the switch is closed according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the base voltage of the transistor and the voltage waveform of the signal input terminal of the main control circuit according to the embodiment of the present invention;
FIG. 6 is a schematic diagram of an equivalent circuit of the motor with poor withstand voltage according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of an AD sampling circuit as the detection circuit according to the embodiment of the present invention;
fig. 8 is a schematic diagram of the case where current flows into the detection circuit through the case when the motor has a poor withstand voltage 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
An embodiment of the present invention provides a motor monitoring method for a food processor, where the food processor may include: the main control circuit 5, and the power supply 2, the switch 1, the detection circuit 3 and the motor drive circuit 4 which are connected in sequence; as shown in fig. 1 and 2, the detection signal output terminal of the detection circuit 3 is connected to the signal input terminal of the main control circuit 5, and the method may include S101 to S104:
s101, after the switch is closed, acquiring a detection signal of the signal input end;
s102, determining signal parameters of the detection signals; the signal parameters include any one or more of: duty cycle, pulse width, low level duration, and detected voltage value;
s103, determining whether the motor has a bad withstand voltage phenomenon according to the change condition of the signal parameter;
s104, when the voltage-resistant bad phenomenon of the motor is determined, processing according to a preset processing scheme; the preset treatment scheme comprises any one or more of the following: alarming, controlling the motor to stop running and cutting off the power supply of the motor.
In an exemplary embodiment of the present invention, as shown in fig. 3, the detection circuit may include: the power supply comprises a diode D1, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a third voltage-dividing resistor R3, a fourth voltage-dividing resistor R4, a triode Q1, a first filter capacitor C1, a second filter capacitor C2 and a pull-up resistor R5;
the diode D1, the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are sequentially connected in series; an anode of the diode D1 is a detection signal input end of the detection circuit, a first end of the fourth voltage dividing resistor R4 is connected to the third voltage dividing resistor R3, and a second end is connected to a signal ground SGND;
the first filter capacitor C1 is connected with the fourth voltage-dividing resistor R4 in parallel;
an emitting electrode B of the triode Q1 is connected with a first end of the fourth voltage-dividing resistor R4, a base electrode E is connected with the SGND, and a collector electrode C is connected with a first end of the pull-up resistor R5;
the second end of the pull-up resistor R5 is connected with a power supply; the second filter capacitor C2 is connected in parallel between the base electrode and the collector electrode of the triode;
and the signal input end Z of the main control circuit is connected with the collector C.
In an exemplary embodiment of the invention, when the food processor is in normal operation, and the switch is closed, since the signal ground SGND is 220V for N (power supply zero line), the power supply performs half-wave rectification through D1, divides the voltage through R4, and then turns on and off the triode Q1, so that a square wave with a frequency of 50HZ and a duty ratio of 50% is formed at the signal input end Z of the main control circuit; when the switch is off, the power supply is turned off and the signal at Z is continuously high. After the motor is in poor withstand voltage, a large resistor is generated between the shell and the internal conducting wire, the resistor is connected with the detection circuit, the resistance of the voltage division circuit is changed, so that the detection signal is changed, at the moment, the signal at the Z position is a square wave signal with the frequency of 50HZ and the duty ratio of less than 50%, and based on the principle, the duty ratio, the pulse width, the low level duration (such as the zero voltage duration) or the voltage difference of the detection signal are identified through the main control circuit, so that whether the motor has poor withstand voltage can be judged.
In the exemplary embodiment of the invention, by detecting the problem of the withstand voltage of the motor, other abnormalities caused by continuous use after poor withstand voltage are avoided.
Example two
The embodiment provides a specific implementation mode for determining whether the motor has a voltage-withstanding phenomenon according to the variation of the signal parameter on the basis of the first embodiment.
In an exemplary embodiment of the present invention, when the signal parameter is the duty ratio, the determining whether the motor has a voltage withstanding phenomenon according to a variation of the signal parameter may include:
when the duty ratio is reduced, determining that the motor has poor withstand voltage;
and when the duty ratio is not changed, determining that the motor has no bad withstand voltage phenomenon.
In an exemplary embodiment of the invention, when the switch is closed during normal operation of the food processor, a square wave with a frequency of 50HZ and a duty ratio of 50% is formed at the signal input end Z of the main control circuit; after the motor is poor in voltage resistance, a large resistor is generated between the shell and the inner conducting wire, the resistor is led into the detection circuit, the resistance of the voltage division circuit is changed, and therefore detection signals are changed, at the moment, the signal at the Z position is a square wave signal with the frequency of 50HZ and the duty ratio of less than 50%. Therefore, the duty ratio of the signal detected by the Z port can be directly detected to determine whether the motor has poor withstand voltage, and the scheme is simple and easy to implement.
In an exemplary embodiment of the present invention, when the signal parameter is the pulse width, the determining whether the voltage withstanding phenomenon occurs in the motor according to the variation of the signal parameter may include:
when the pulse width is larger than a preset pulse width threshold value, determining that the motor has poor withstand voltage;
and when the pulse width is less than or equal to the pulse width threshold value, determining that the motor has no bad withstand voltage phenomenon.
In an exemplary embodiment of the present invention, when the signal parameter is the low level lasting time, the determining whether the voltage withstanding phenomenon occurs in the motor according to the variation of the signal parameter may include:
when the duration of the low level is less than a preset duration threshold, determining that the motor has poor withstand voltage;
and when the duration of the low level is greater than or equal to the duration threshold, determining that the motor has no bad withstand voltage phenomenon.
In an exemplary embodiment of the present invention, when a switch (such as a magnetic control microswitch) is closed, and an equivalent circuit thereof is as shown in fig. 4, at a voltage of 220V, a power supply voltage is half-wave rectified through D1, and then divided by R4, R1, R2, and R3 to obtain a voltage UB at a base B end to control the conduction of a triode, at a positive half-wave,
u at negative half wave B =0, the waveform of which is shown by the graph in fig. 5. When U is turned B When the voltage is greater than 0.7V of the conduction voltage of the triode, IIIPole tube is on when U B When the voltage is less than 0.7V, the triode is turned off and passes through U B =0.7V, the starting on-time T = T1 can be calculated. When the triode is turned off, the Z end outputs high level, and the waveform output by the Z end is shown as a straight line in figure 5. The main control circuit can acquire that the low level duration is T1= (0.01-2T 1) S, and the high level duration is T2= (0.01 +2t 1) S.
In the exemplary embodiment of the present invention, when the motor has a bad withstand voltage, the equivalent circuit is shown in fig. 6, and the voltage dividing circuit is connected in series to the resistor R of the motor, so that when the positive half wave occurs,
u at negative half wave B =0, resulting in a shorter on-time of the triode at that time, i.e. U B And =0.7V, the initial on-time T = T2 can be calculated, and the main control circuit can acquire that the low level duration is T3= (0.01-2T 2) S and the high level duration is T4= (0.01 +2t 2) S. Since R is far larger than the rest of resistances, T3 is far smaller than T1 through calculation, and a threshold value T (T2) is set>T>T1), when the low level is detected and the duration is greater than (0.01-2T) S, namely a long threshold, or when the high level is detected and the duration is less than (0.01 + 2T) S, namely a pulse width threshold, the detection signal is considered to be normal, otherwise, the detection signal is considered to be abnormal due to poor voltage resistance.
In the exemplary embodiment of the present invention, the problem of the poor withstand voltage of the motor is indirectly recognized through the judgment of the low level duration and the pulse width.
EXAMPLE III
This embodiment is based on the first embodiment, and the method further includes: the switch comprises a closed state and an open state; and only when the switch is in an off state, acquiring a voltage value of the signal input end, which can determine whether the motor has poor withstand voltage, and determining whether the motor has the poor withstand voltage according to the change condition of the signal parameter, namely, identifying the poor withstand voltage of the motor by performing AD detection on the detection signal.
In an exemplary embodiment of the present invention, when the switch is in an off state, and the signal parameter is the voltage value, the determining whether the voltage withstand failure phenomenon occurs in the motor according to the variation of the signal parameter may include:
when the voltage value is larger than zero and smaller than a preset voltage threshold value, determining that the motor has a voltage withstanding phenomenon;
and when the voltage value is zero, determining that the motor has no bad withstand voltage phenomenon.
In an exemplary embodiment of the present invention, when the detection circuit is an analog-to-digital AD sampling circuit, a circuit diagram may be as shown in fig. 7.
In an exemplary embodiment of the present invention, the detection circuit may include: the diode D2, the fifth voltage-dividing resistor R5, the sixth voltage-dividing resistor R6, the seventh voltage-dividing resistor R7, the eighth voltage-dividing resistor R8, the third filter capacitor EC1 and the fourth filter capacitor C3;
the diode D2, the fifth voltage-dividing resistor R5, the sixth voltage-dividing resistor R6, the seventh voltage-dividing resistor R7 and the eighth voltage-dividing resistor R8 are sequentially connected in series; the anode of the diode D2 is a detection signal input end of the detection circuit, the first end of the eighth voltage-dividing resistor R8 is connected to the seventh voltage-dividing resistor R7, and the second end is connected to the signal ground SGND;
the third filter capacitor EC1 and the fourth filter capacitor C3 are both connected with the eighth voltage-dividing resistor R8 in parallel;
and an AD signal sampling end VOL _ AD of the main control circuit is connected with the first end of the eighth voltage-dividing resistor R8.
In the exemplary embodiment of the invention, when the switch is closed, the power supply is rectified by D2, then divided by R8, and filtered by EC1 to obtain the voltage value V AD And meanwhile, the master control circuit carries out AD sampling on the voltage at the point through the VOL _ AD. Because the input voltage of the main control circuit (such as a singlechip) is generally required to be less than 5V, namely 275 × 0.45 × R8/220K at the maximum value of the input voltage<5, then R8<8.8K, in the scheme of the embodiment, R8=3.3K Ω may be taken.
In exemplary embodiments of the inventionWhen the motor is normal and the switch is closed, the voltage at VOL _ AD is V AD =0.45u by 3.3/220, u being the current mains voltage. When the switch is turned off, no voltage is input, and the voltage at VOL _ AD is V AD ＝0。
In an exemplary embodiment of the present invention, when a withstand voltage failure occurs in the motor: when the switch is closed, the voltage at the VOL _ AD position is consistent with that in normal state and is not in a monitoring state; when the switch is turned off, voltage is connected in series through the motor shell, the voltage at VOL _ AD is 0.45U + 3.3/(220 + R), U is the current mains voltage, and R is the equivalent resistance when the motor has poor withstand voltage. Then the voltage V at the voltage threshold VT, VOL _ AD is set AD Satisfies 0<V AD <And when VT is used, the condition that the pressure resistance of the motor is poor can be judged. Meanwhile, since the allowable range of the current mains voltage U is 155V-275V, the VT setting needs to be smaller than V when the switch is closed under the voltage of 155V AD =1V, and VT is larger than V under 275V AD =0.33V, therefore, the scheme of the present embodiment may take VT =0.7V. Therefore, the monitoring of the voltage withstanding of the motor is realized.
In the exemplary embodiment of the invention, by identifying the signal AD value of the detection circuit, when the detection AD value is lower than the set voltage threshold value, the problem of poor withstand voltage of the motor can be judged.
Example four
This embodiment is based on any of the above embodiments, and gives a specific connection embodiment of the detection circuit.
In an exemplary embodiment of the present invention, as shown in fig. 3, a first end of the switch 1 is connected to a zero line of the power supply 2, and a second end is connected to a detection signal input end of the detection circuit 3;
a rectifier bridge 41 is arranged in the motor driving circuit 4, and the detection signal input end is directly connected with the rectifier bridge 41.
In the exemplary embodiment of the present invention, the input end of the detection circuit needs to be directly connected with the rectifier bridge 41 of the motor 6, and the controllable switch 1 needs to be added between the input end and the zero line so as to cut off the input of the power supply of the zero line end during detection.
In the exemplary embodiment of the present invention, the detection circuit 3 is disconnected from the power supply 2 by opening the switch 1, thereby switching the input of the detection circuit to the motor drive circuit 4.
EXAMPLE five
The embodiment is based on any embodiment above, and provides an embodiment scheme that the opening and closing of a switch (such as a magnetic control microswitch) is controlled by the opening and closing of an upper cover.
In an exemplary embodiment of the invention, the switch is a magnetically controlled microswitch; the method may further comprise: the magnetic control micro switch is controlled to be switched on and off by opening and closing the cup cover of the food processor.
In an exemplary embodiment of the invention, a magnet can be arranged in the cup cover, and when the cup cover is closed, the magnet is close to the magnetic control microswitch, so that the magnetic control microswitch is closed; when the cup cover is opened, the magnet is far away from the magnetic control microswitch, so that the magnetic control microswitch is switched off.
In the exemplary embodiment of the invention, because the opening and closing operations of the cup cover are required to be executed when the food processor makes milk each time, the magnetic control microswitch has the closing and opening actions when making milk each time, and the pressure resistance problem of the motor can be detected when the magnetic control microswitch is opened.
EXAMPLE six
On the basis of any of the above embodiments, the embodiment provides an embodiment in which a power supply (e.g., a 9V power supply) of a main control circuit (e.g., a single chip) is loaded on a live wire.
In an exemplary embodiment of the invention, the power input terminal of the main control circuit is connected to the live wire output terminal of the power supply, so that the power supply of the main control circuit is loaded on the live wire of the power supply.
In an exemplary embodiment of the present invention, the motor housing now needs to be Grounded (GND), since the zero line is almost equal to ground potential and 9v is at 9v to signal ground SGND, when 9v is loaded on the live line, the voltage of GND to SGND is about the voltage of zero line to live line, i.e. the voltage is about zero line to live line
In the exemplary embodiment of the present invention, when the withstand voltage of the motor is poor, corresponding to a large resistance between the case and the coil, a current flows into the detection circuit through the case due to a potential difference between GND and SGND, resulting in a square wave signal having a frequency of 50HZ and a duty ratio of less than 50% even when the micro switch is turned off Z.
In an exemplary embodiment of the present invention, the current flow is as shown by line X in FIG. 8.
EXAMPLE seven
This embodiment gives an example scheme of the threshold value set by voltage adjustment on the basis of any of the above embodiments.
In an exemplary embodiment of the present invention, the method may further include: and adjusting the set threshold value according to the working voltage of the food processor.
In the exemplary embodiment of the invention, the working voltage U of the current food processor, such as a soymilk machine, is in the range of 155-275V, the conduction voltage of the triode is 0.7V, and calculation shows that
And meanwhile, the starting conduction time t of the triode is inversely proportional to the current working voltage U, and the larger the voltage U is, the faster the conduction is. Therefore, the set threshold is adjusted correspondingly according to the current operating voltage U, that is, the detection signal is considered to be normal when the low level and the duration are greater than (0.01-2t 220/U) S or the detection signal is considered to be normal when the high level and the duration are less than (0.01 +2t 220/U), otherwise, the detection abnormality caused by the voltage withstanding failure is confirmed, wherein U is the current operating voltage value, and T is the on-time threshold set when the voltage T is 220V.
In the exemplary embodiment of the invention, through the scheme of the embodiment, the interference of pulse width difference when different working voltages are used is avoided, and the accuracy of high-voltage and low-voltage judgment is increased.
Example eight
This embodiment provides an embodiment in which the difference between the detection signal at the time of the breakdown voltage failure and the detection signal at the time of the normal operation is enlarged by setting an appropriate resistance value on the basis of any of the above embodiments.
In an exemplary embodiment of the present invention, in this embodiment, R4 (or R8) =5.1K Ω, and R1= R2= R3=73.3K Ω (or R5= R6= R7=73.3K Ω) may be selected. Since the power of the resistor is generally 1/4W, in order to ensure that the resistor is not burned out due to excessive power, i.e., U × U/R <0.25, in consideration of the common specification of the resistor, the embodiment adopts a mode of connecting 3 resistors in series by 73.3 ohms, so as to reduce the power consumption of each resistor, and at this time, the maximum power consumption of each resistor is 275 × 275.0.45 × 0.45/220K/3=0.023w, thereby meeting the use requirement.
In an exemplary embodiment of the present invention, when the motor is normal, the triode conduction condition is
Because the time length between two zero points is 10ms when the normal mains voltage passes zero, in order to ensure that the detection signal (such as a zero-crossing signal) at the Z position is consistent with the mains zero crossing as much as possible, namely the smaller the conduction time t is, the smaller the current conduction time t is<The use requirement can be met within 0.5ms, and the calculated R4 is more than 4.4K omega.
In the exemplary embodiment of the present invention, when the withstand voltage of the motor is poor, the resistance of R is in the order of mega Ω, and the conduction condition of the triode is that
The larger R is, the larger the initial conduction time t is; the larger R4, the larger the initial on-time t. Therefore, the larger the R4 is, the more accurate the zero crossing of the motor in normal condition is, but the smaller the difference with the motor in poor pressure resistance is; on the other hand, the smaller R4 is, the larger the zero-crossing deviation is when the motor is normal, but the larger the difference from the case of the motor breakdown voltage failure is.
In the exemplary embodiment of the present invention, R4=5.1K is set in the scheme of this embodiment, and it is calculated that the initial conduction time t =0.31ms when the motor is normal, that is, the pulse width of the zero-crossing signal at the low level is (0.01-2 t) S =9.4ms, and the pulse width at the high level is 10.6ms. When the motor voltage resistance is poor, if R is 1M Ω, the on time is t =2.6ms, that is, the pulse width of the zero-crossing signal at the low level is (0.01-2 t) S =4.8ms, and the pulse width at the high level is 15.2ms. The pulse width of the motor is different from that of the motor in a normal state by 4.6ms, and the difference is large, so that the motor can be effectively detected.
In the exemplary embodiment of the invention, by the scheme of the embodiment, the difference of the pulse widths in the normal zero-crossing and poor voltage resistance is increased, so that the detection is more reliable.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as is well known to those skilled in the art.
Claims (5)
1. A method of monitoring a motor of a food processor, the food processor comprising: the main control circuit is connected with a power supply, a switch, a detection circuit and a motor driving circuit in sequence; the detection signal output end of the detection circuit is connected with the signal input end of the main control circuit, the first end of the switch is connected with the zero line of the power supply, and the second end of the switch is connected with the detection signal input end of the detection circuit; the method comprises the following steps:
the switch comprises a closed state and an open state;
when the switch is in an off state, acquiring a voltage value of the signal input end, which can be used for judging whether the motor has poor withstand voltage;
when the voltage value is zero, determining that the motor has no voltage withstanding phenomenon;
and when the voltage value is larger than zero and smaller than a preset voltage threshold value, determining that the motor has poor withstand voltage.
2. The method of monitoring a motor of a food processor of claim 1, further comprising: the on-off of the switch is controlled by the opening and closing of the cup cover of the food processor.
3. The method of claim 2, wherein the switch is a magnetically controlled microswitch.
4. The method of claim 1, wherein the detection circuit comprises: the circuit comprises a diode, a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor, a triode, a first filter capacitor, a second filter capacitor and a pull-up resistor.
5. The method of claim 4, wherein the diode, the first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor, and the fourth voltage dividing resistor are connected in series in sequence; an anode of the diode is a detection signal input end of the detection circuit, a first end of the fourth divider resistor is connected with the third divider resistor, and a second end of the fourth divider resistor is connected with a signal ground SGND;
the first filter capacitor is connected with the fourth divider resistor in parallel;
an emitter of the triode is connected with a first end of the fourth voltage-dividing resistor, a base of the triode is connected with the SGND, and a collector of the triode is connected with a first end of the pull-up resistor;
the second end of the pull-up resistor is connected with a power supply; the second filter capacitor is connected in parallel between the base electrode and the collector electrode of the triode;
and the signal input end of the main control circuit is connected with the collector.
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| CN201402968Y (en) * | 2009-04-29 | 2010-02-10 | 九阳股份有限公司 | Pulping circuit of soymilk maker |
| JP6340913B2 (en) * | 2014-05-21 | 2018-06-13 | 日産自動車株式会社 | Control apparatus and control method |
| CN204636106U (en) * | 2015-01-30 | 2015-09-16 | 浙江绍兴苏泊尔生活电器有限公司 | Control circuit for food processor |
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| CN206563796U (en) * | 2017-03-02 | 2017-10-17 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking device and its motor self-checking unit |
| CN207352065U (en) * | 2017-07-25 | 2018-05-11 | 九阳股份有限公司 | A kind of signal deteching circuit and food processor for food processor |
| CN207215926U (en) * | 2017-09-22 | 2018-04-10 | 九阳股份有限公司 | The detection circuit and food processor of a kind of food processor |
| CN109085414B (en) * | 2018-08-10 | 2021-06-11 | 深圳和而泰智能控制股份有限公司 | Voltage detection method and device |
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