CN111123095B - Detection circuit, motor detection method, motor and household appliance - Google Patents
Detection circuit, motor detection method, motor and household appliance Download PDFInfo
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- CN111123095B CN111123095B CN201811291482.5A CN201811291482A CN111123095B CN 111123095 B CN111123095 B CN 111123095B CN 201811291482 A CN201811291482 A CN 201811291482A CN 111123095 B CN111123095 B CN 111123095B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention provides a detection circuit, a motor detection method, a motor and a household appliance, wherein the detection circuit comprises: the two access ports can be accessed to a winding coil of the motor, a first access port of the two access ports is grounded through a lead, and two voltage division elements are connected between a second access port of the two access ports and a direct current source in series; the blocking element is connected between the common end of the two voltage dividing elements and the ground wire; and the detection port of the control module is connected to a common end between the two voltage division elements and is used for acquiring a real-time voltage signal of the common end and determining whether the motor can run instantly according to the voltage signal. According to the technical scheme, the simple and reliable motor detection scheme is provided, the faults of the motor or the abnormal conditions such as missing installation of the motor can be quickly detected while the operation of the whole machine is not influenced, and the reliability of the whole machine of the household appliance is improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a detection circuit, a motor and a household appliance.
Background
With the improvement of the living standard of people, more and more household appliances have high automation functions, for example, the automatic electric rice cooker sequentially executes processes of rice feeding, water supplying, rice washing, rice discharging, cooking and the like, wherein a material washing box of the automatic electric rice cooker is generally provided with a stirring motor and a material discharging opening driving motor, and in addition, if the household appliance is provided with a fan assembly, a core part of the fan assembly for executing corresponding actions is also a motor.
In the related art, for household appliances such as automatic rice cookers which rely on a motor to realize an automatic function, the related detection of whether the motor can operate immediately is not involved, and particularly, whether the motor is neglected to be installed or not cannot be determined, which results in poor operation reliability of the household appliances and difficulty in troubleshooting.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, it is an object of the invention to provide a detection circuit.
Another object of the present invention is to provide a motor detection method.
It is another object of the present invention to provide an electric machine.
Another object of the present invention is to provide a home appliance.
To achieve the above object, according to an embodiment of a first aspect of the present invention, there is provided a detection circuit including: the two access ports can be accessed into a winding coil of the motor, a first access port of the two access ports is grounded through a lead, and two voltage division elements are connected between a second access port of the two access ports and a direct current source in series; the blocking element is connected between the common end of the two voltage dividing elements and the ground wire; and the detection port of the control module is connected to a common end between the two voltage division elements and is used for acquiring a real-time voltage signal of the common end and determining whether the motor can run instantly according to the voltage signal.
In the technical scheme, the two access interfaces, the DC blocking element and the control module are arranged according to the connection mode, so that the operation capacity of the motor can be detected in real time, when the motor is neglected to be installed or fails, the motor cannot operate immediately, and when the motor is installed correctly, the motor can operate immediately.
Specifically, a winding coil of the motor can be generally regarded as an inductance element, the inductance element has the characteristic that when direct current is conducted, the resistance value of the inductance element is close to the resistance value of a wire, when the direct current is not electrified or is subjected to continuous ripple signals or surge signals, the resistance value of the inductance element is close to the resistance value in an open circuit state, and in the two states, output signals of a common end of two voltage division elements are different.
The voltage dividing element generally employs one resistor, a plurality of resistors connected in series and/or in parallel, but is not limited to the above arrangement.
In addition, the dc blocking element generally employs one capacitor, a plurality of capacitors connected in series and/or in parallel, that is, the dc blocking element plays a role of isolating the dc signal, but is not limited to the above arrangement.
Finally, the control module can be MCU, DSP, CPU, embedded device or comparator, etc., and the detection port can be general I/O interface or communication interface, but not limited to this.
In any of the above technical solutions, preferably, the method further includes: and the output end of the direct current driving module is connected to one end, close to the second access port, of the winding coil through the direct current signal input end and is used for outputting a direct current driving signal to the winding coil, and when the winding coil is connected into the direct current driving signal, the winding coil can be conducted in a wire form.
In this technical scheme, by setting the dc signal input end according to the above connection manner, it can be ensured that a winding coil of the motor is connected to a dc driving signal for operation, that is, before the motor is detected, it is necessary to determine that the dc signal input end outputs the dc driving signal to the motor, so as to improve reliability and accuracy of motor detection.
The dc driving module includes an inverter, a PFC (Power Factor Correction), a rectifier bridge, and a filter, but is not limited thereto.
In any of the above technical solutions, preferably, when the motor can run instantly, the winding coil serves as a wire to connect the two voltage dividing elements in series between the dc source and the ground, and the real-time voltage signal at the common terminal is a load voltage signal of the first voltage dividing element of the ground, where the load voltage signal can be recognized as a low level signal by the control module.
In the technical scheme, when the motor can run instantly, the winding coil is used as a lead to connect the two voltage division elements in series between the direct current source and the ground wire, the real-time voltage signal of the common end is the load voltage signal of the first voltage division element of the ground wire, and the load voltage signal is set to be recognized as a low level signal by the control module, namely when the low level signal is detected, the winding coil is determined to be normally electrified and has the property of the lead, so that the running reliability of the household appliance to which the winding coil belongs can be effectively guaranteed.
In any of the above technical solutions, preferably, when the motor cannot run instantly, the winding coil opens the two voltage dividing elements, and the real-time voltage signal at the common terminal is a dc output signal of the dc source, where the dc output signal can be recognized as a high-level signal by the control module.
According to the technical scheme, when the motor cannot run immediately, the winding coil is disconnected with the two voltage division elements, a real-time voltage signal of a public end is a direct-current output signal of a direct-current source, the direct-current output signal is set to be recognized as a high-level signal by the control module, namely when the high-level signal is detected, the winding coil is determined to be in a disconnected state due to neglected installation or faults, and based on the situation, the motor can be controlled to stop and follow-up process is stopped, and fault prompt is carried out on a user, so that the user or maintenance personnel can timely troubleshoot the fault problem of the motor.
In any of the above technical solutions, preferably, a ratio between a resistance value of the first voltage dividing element and a resistance value of the second voltage dividing element is less than or equal to three-seventh, where the second voltage dividing element is another one of the two voltage dividing elements connected to the dc source.
In the technical scheme, the ratio of the resistance value of the first voltage division element to the resistance value of the second voltage division element is set to be less than or equal to three-seventh, so that when the motor can run instantly, the load voltage signal of the first voltage division element can be identified as a low level signal by the control module.
In any of the above technical solutions, preferably, a ratio between the resistance value of the first voltage dividing element and the resistance value of the second voltage dividing element is greater than or equal to seven-thirds.
In this technical scheme, through setting up the ratio between the resistance of first partial pressure component and the resistance of second partial pressure component and be greater than or equal to seven thirds, and then when the motor can operate immediately, the load voltage signal of first partial pressure component can be discerned as low level signal by the control module, in addition, when the motor can not operate immediately, the direct current output signal of direct current source can be discerned as high level signal by the control module.
According to a second aspect of the present invention, there is provided a motor detection method, including: after detecting that an electrifying signal is output to a winding coil of the motor, detecting a voltage signal of a common end between two voltage division elements in a detection circuit; and determining whether the motor can operate immediately according to the voltage signal.
In the technical scheme, after the electrifying signal is output to the winding coil of the motor, the voltage signal of the common end between the two voltage division elements in the detection circuit is detected, whether the motor can run immediately is further determined according to the voltage signal, the running capability of the motor can be detected in real time, when the motor is neglected to be installed or fails, the motor cannot run immediately, when the motor is correctly installed, the motor can run immediately, the detection scheme is reliable, and the cost for additionally arranging the detection circuit is low.
In any of the above technical solutions, preferably, determining whether the motor can run immediately according to the voltage signal specifically includes: when the voltage signal is detected to be identified as a high level signal, determining that the motor cannot run immediately or is in a leakage connection state; and when the voltage signal is detected to be identified as a low level signal, determining that the motor can run immediately.
In the technical scheme, by referring to the setting mode and specific limited content of the detection circuit, when the voltage signal is detected to be identified as a high level signal, the motor is determined not to be capable of running instantly or be in a leakage connection state, and when the voltage signal is detected to be identified as a low level signal, the motor is determined to be capable of running instantly, so that the running capability of the motor can be accurately and reliably detected, the detection efficiency is high, and the improvement of the reliability of the whole household appliance is facilitated.
According to an embodiment of a third aspect of the present invention, there is provided an electric machine including: a winding coil; according to the detection circuit of any one of the above technical solutions, the detection circuit can be connected to the winding coil to detect whether the motor can run instantly.
According to an embodiment of a fourth aspect of the present invention, there is provided a home appliance including: the motor of any one of the above technical solutions.
In any of the above technical solutions, preferably, the household appliance is one of an electric cooker, an electric pressure cooker, a steamer, a fully automatic washing machine, a coffee maker and a water heater.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow diagram of a detection circuit according to one embodiment of the present invention;
FIG. 2 shows a schematic flow diagram of a motor detection method according to an embodiment of the invention;
FIG. 3 shows a schematic block diagram of an electric machine according to an embodiment of the invention;
fig. 4 shows a schematic structural diagram of a home appliance according to an embodiment of the present invention;
fig. 5 shows a schematic block diagram of a household appliance according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The first embodiment is as follows:
FIG. 1 shows a schematic flow diagram of a detection circuit according to one embodiment of the present invention.
As shown in fig. 1, a detection circuit 100 according to an embodiment of the present invention includes: the two access ports can be connected into a winding coil L of the motor, a first access port P1 in the two access ports is grounded through a lead, and two voltage division elements are connected in series between a second access port P2 in the two access ports and a direct current power supply Vcc; the DC blocking element C is connected between the common end of the two voltage division elements and the ground wire GND; and the detection port of the control module is connected to a common end between the two voltage division elements and is used for acquiring a real-time voltage signal of the common end and determining whether the motor can run instantly according to the voltage signal.
In the technical scheme, the two access interfaces, the DC blocking element C and the control module are arranged according to the connection mode, so that the operation capacity of the motor can be detected in real time, when the motor is neglected to be installed or fails, the motor cannot operate immediately, and when the motor is installed correctly, the motor can operate immediately.
Specifically, the winding coil L of the motor may be generally regarded as an inductance element, and the inductance element has a characteristic that when the dc is conducted, the resistance value of the inductance element is close to the resistance value of the wire, and when the dc is not powered on or is subjected to a continuous ripple signal or surge signal, the resistance value of the inductance element is close to the resistance value in the off state, and in the two states, the common terminal output signals of the two voltage dividing elements are different.
The voltage dividing element generally employs one resistor, a plurality of resistors connected in series and/or in parallel, but is not limited to the above arrangement.
In addition, the dc blocking element C usually adopts one capacitor, a plurality of capacitors connected in series and/or in parallel, i.e. functions to isolate the dc signal, but is not limited to the above arrangement.
Finally, the control module can be MCU, DSP, CPU, embedded device or comparator, etc., and the detection port can be general I/O interface or communication interface, but not limited to this.
In any of the above technical solutions, preferably, the method further includes: and the direct current signal input end P3 is connected to the direct current driving module Vdd, and the output end of the direct current driving module Vdd is connected to one end, which is close to the second access port P2, of the winding coil L through the direct current signal input end P3, and is used for outputting a direct current driving signal to the winding coil L, wherein when the winding coil L is connected to the direct current driving signal, the winding coil L can be conducted in a wire form.
In this technical solution, by setting the dc signal input terminal P3 according to the above connection manner, it can be ensured that the winding coil L of the motor is connected to the dc driving signal for operation, that is, before the motor is detected, it is necessary to determine that the dc signal input terminal P3 outputs the dc driving signal to the motor, so as to improve the reliability and accuracy of the motor detection.
The dc driving module Vdd includes an inverter, a PFC (Power Factor Correction), a rectifier bridge, and a filter, but is not limited thereto.
In any of the above technical solutions, preferably, when the motor is capable of running instantly, the winding coil L serves as a lead to connect the two voltage dividing elements in series between the dc source Vcc and the ground GND, and the real-time voltage signal of the common terminal is a load voltage signal of the first voltage dividing element R1 of the ground GND, wherein the load voltage signal can be recognized as a low level signal by the control module.
In the technical scheme, when the motor can run instantly, the winding coil L is used as a lead to connect two voltage division elements in series between the direct current source Vcc and the ground wire GND, the real-time voltage signal of the common end is the load voltage signal of the first voltage division element R1 of the ground wire GND, and the load voltage signal is set to be recognized as a low-level signal by the control module, namely when the low-level signal is detected, the winding coil L is determined to be normally electrified and has the lead property, so that the running reliability of the household appliance to which the winding coil L belongs can be effectively guaranteed.
In any of the above technical solutions, preferably, when the motor cannot run immediately, the winding coil L opens the two voltage dividing elements, and the real-time voltage signal at the common terminal is a dc output signal of the dc source Vcc, where the dc output signal can be recognized as a high-level signal by the control module.
In the technical scheme, when the motor cannot run immediately, the winding coil L is disconnected with the two voltage division elements, the real-time voltage signal of the common end is the direct-current output signal of the direct-current source Vcc, the direct-current output signal is set to be recognized as a high-level signal by the control module, namely when the high-level signal is detected, the winding coil L is determined to be in a disconnected state due to neglected installation or failure, and based on the situation, the motor can be controlled to stop and the follow-up process is stopped, and a fault prompt is given to a user, so that the user or a maintenance worker can timely troubleshoot the fault problem of the motor.
In any of the above technical solutions, preferably, a ratio between a resistance value of the first voltage dividing element R1 and a resistance value of the second voltage dividing element R2 is less than or equal to three-seventh, where the second voltage dividing element R2 is another element of the two voltage dividing elements connected to the dc source Vcc.
In this technical solution, by setting the ratio between the resistance value of the first voltage dividing element R1 and the resistance value of the second voltage dividing element R2 to be less than or equal to three-seventeen, when the motor can run instantly, the load voltage signal of the first voltage dividing element R1 can be identified as a low level signal by the control module.
In any of the above solutions, it is preferable that the ratio between the resistance value of the first voltage dividing element R1 and the resistance value of the second voltage dividing element R2 is greater than or equal to seven-thirds.
In the technical scheme, the ratio of the resistance value of the first voltage division element R1 to the resistance value of the second voltage division element R2 is larger than or equal to seven thirds, so that when the motor can run instantly, a load voltage signal of the first voltage division element R1 can be identified as a low level signal by the control module, and in addition, when the motor cannot run instantly, a direct current output signal of the direct current source Vcc can be identified as a high level signal by the control module.
Example two:
fig. 2 shows a schematic flow diagram of a motor detection method according to an embodiment of the invention.
As shown in fig. 2, a motor detection method according to an embodiment of the present invention includes: step S202, after detecting that an electrifying signal is output to a winding coil of the motor, detecting a voltage signal of a common end between two voltage division elements in a detection circuit; and step S204, determining whether the motor can run instantly according to the voltage signal.
In the technical scheme, after the electrifying signal is output to the winding coil of the motor, the voltage signal of the common end between the two voltage division elements in the detection circuit is detected, whether the motor can run immediately is further determined according to the voltage signal, the running capability of the motor can be detected in real time, when the motor is neglected to be installed or fails, the motor cannot run immediately, when the motor is correctly installed, the motor can run immediately, the detection scheme is reliable, and the cost for additionally arranging the detection circuit is low.
In any of the above technical solutions, preferably, determining whether the motor can run immediately according to the voltage signal specifically includes: when the voltage signal is detected to be identified as a high-level signal, determining that the motor cannot run immediately or is in a leakage connection state; when the voltage signal is detected and recognized as a low level signal, it is determined that the motor can be instantly operated.
In the technical scheme, by referring to the setting mode and specific limited content of the detection circuit, when the voltage signal is detected to be identified as a high level signal, the motor is determined not to be capable of running instantly or be in a leakage connection state, and when the voltage signal is detected to be identified as a low level signal, the motor is determined to be capable of running instantly, so that the running capability of the motor can be accurately and reliably detected, the detection efficiency is high, and the improvement of the reliability of the whole household appliance is facilitated.
Example three:
fig. 3 shows a schematic block diagram of an electrical machine according to an embodiment of the invention.
As shown in fig. 3, a motor 300 according to an embodiment of the present invention includes: a winding coil 302; in the detection circuit 100 according to any of the above embodiments, the detection circuit 100 can access the winding coil 302 to detect whether the motor 300 can operate immediately.
Example four:
fig. 4 shows a schematic configuration diagram of a home appliance according to an embodiment of the present invention.
As shown in fig. 4, the technical solution of the present invention is explained in detail by taking an automatic electric cooker 400 as a specific embodiment, and the automatic electric cooker 400 includes: a cleaning cavity 402, the cleaning cavity 402 is communicated with a liquid supply pipeline 404, a liquid discharge pipeline 410, a feeding pipeline 426 and an air blowing pipeline 420, the liquid supply pipeline 404 is used for providing cleaning liquid for the cleaning cavity 402, the liquid discharge pipeline 410 is used for discharging the cleaning liquid after cleaning, the feeding pipeline 426 is used for conveying materials to the cleaning cavity 402 and performing air blowing treatment on the area below the liquid level in the cleaning cavity 402, the air blowing pipeline 420 is used for air-drying the cleaning liquid in the cleaning cavity 402 after cleaning in the cleaning cavity 402, the materials are remained in the cleaning cavity 402 after the materials are cleaned by the material cleaning device, cleaning of the cleaning cavity 402 is performed according to a preset period, when the cleaning cavity 402 is supplied with liquid, the feeding pipeline 426 is controlled to perform air blowing treatment on the area below the liquid level in the cleaning cavity 402, and after a preset time interval of air blowing treatment is completed, the liquid discharge pipeline 410 is controlled to discharge the cleaning liquid, and meanwhile, the air blowing pipeline 420 is controlled to air-dry the cleaning cavity 402, so that the cleaning liquid in the cleaning cavity 402 can be discharged along with air through the liquid discharge pipeline 410 and/or the exhaust pipeline 416, the problem of bacterial breeding caused by the residual cleaning liquid and/or materials in the cleaning cavity 402 is further reduced, the cleaning effect on the cleaning cavity 402 is effectively improved, and the user experience is improved.
The inlet end of the feeding pipeline 426 is connected with a first fan (the core component is the motor 300), the inlet end of the blowing pipeline 420 is connected with a second fan (the core component is the motor 300), the outlet ends of the feeding pipeline 426 and the blowing pipeline 420 are connected into the cleaning cavity 402, the liquid supply pipeline 404 further comprises a water faucet 500 and a liquid supply control valve 406, and the liquid discharge pipeline 410 further comprises a liquid discharge control valve 414 and a water discharge receiving box 412.
In this embodiment, the automatic cooking process of the full automatic electric rice cooker 400 includes a loading process, a washing process, a discharging process, and a heating process.
(1) The feeding process comprises the following steps: the feed valve 424 under the storage tank 422 is opened, the stored material falls into the air shuttle 428, and the first fan (the core is the motor 300) is activated to blow the material into the wash chamber 402 through the feed line 426.
(2) The material washing process comprises the following steps: after the feeding process is completed, the liquid supply pipeline 404 and the water faucet 500 are opened, at the moment, the opening and closing degree of the liquid supply control valve 404 is adjusted by combining flow information acquired by the flow Sensor to realize quantitative liquid supply to the cleaning cavity 402, the air blowing pipeline 440 and the second fan (the core part is the motor 300) are simultaneously started, air blowing treatment is carried out below the liquid level in the cleaning cavity 402, the material cleaning efficiency is accelerated, and after a preset time period, the liquid discharge control valve 414 is communicated with the liquid discharge pipeline 410 to discharge cleaning liquid.
(3) The blanking process comprises the following steps: the feed opening that washs chamber 402 is opened, open liquid supply pipeline 404 and tap 500, make the material can be along with the washing liquid gets into in the culinary art chamber 408, reach and predetermine the liquid supply volume after, control liquid supply pipeline 404 and tap 500 after ending, open pay-off pipeline 426 and/or blast pipe 420 and air-dry to wasing chamber 402, wherein, the core component that is used for air-dried fan is above-mentioned motor 300 also, make adnexed completion abluent material drying and the spalling on the inner wall, promote the unloading effect, the extravagant problem of material has been reduced, the unable closure of washing chamber 402 that has reduced the material simultaneously and has remained the result, unable reseing and the unable sealed condition emergence, also be favorable to improving the cleanliness of washing chamber 402.
(4) An exhaust line 416 is provided on the upper side of the upper lid to equalize the air pressure within the cleaning chamber 402 during the cleaning process.
The liquid source may be a water faucet 500 and a liquid storage tank outside the household appliance, or a liquid storage box inside the household appliance.
The detection scheme in conjunction with fig. 1 to 4 specifies the following operating principles and core elements: a direct current source Vcc for the control module to work; a pull-up resistor (i.e., one embodiment of the second voltage divider element R2, but not limited thereto) is used to provide an initial high level of the detection signal; the current limiting resistor (i.e., an embodiment of the first voltage dividing element R1, but not limited thereto) serves as a current limit for the port signal, so as to prevent the overcurrent from burning the port of the control module chip; the blocking element C filters signal noise to avoid misjudgment caused by interference of signal noise detection; the dc signal input terminal P3 of the driving module of the motor 300 can be connected to the dc driving module Vdd, where Vcc and Vdd may be equal or different.
As shown in fig. 1, initially, due to the action of the dc source Vcc and the pull-up resistor (i.e., an embodiment of the second voltage dividing element R2, but not limited thereto), the voltage signal Vdet at the common terminal is at a high level, that is, when the motor 300 is capable of running instantly, the dc driving module Vdd supplies a dc signal, the driving module of the motor 300 is normally operated, and the winding coil L can be driven to be in a wire state, so that Vcc, R1, R2, L and GND form a serial voltage dividing loop, and the Vdet detected by the control module is Vcc x (R1/(R1+ R2)), specifically, (R1/(R1+ R2)) is smaller than a threshold coefficient of the control module for detecting a low-level signal, and is generally 0.2 to 0.3.
Therefore, when the motor 300 is operating normally, Vdet is detected as low level 0 (the control module determines that R1/(R1+ R2) is lower than the control module low level threshold, all the signals are regarded as level 0), and conversely, when the motor driving module fails, the winding coil L cannot be driven to operate, which corresponds to Vcc, R1, R2, L and GND forming a series voltage dividing loop which is open, the voltage signal at the common end is the clamp signal Vcc of the pull-up resistor, i.e., Vdet is regarded as Vcc, and the control module recognizes Vdet as high level signal 1 (the control module generally considers that the high level threshold coefficient is 0.7-0.8, i.e., when Vdet >0.7 × Vcc, the control module considers the control module as a high level signal). Similarly, when the motor 300 is not assembled, the Vdet detection corresponds to the detection of an open circuit, and the high signal 1 is also detected, thereby determining that the motor 300 is faulty.
The motor driving module is a controller connected to the input side of the motor and used for inputting a direct current driving signal or a three-phase inversion driving signal to the motor.
In summary, based on the above detection scheme and detection circuit 100, the following works: when Vdet is 0, the state of the motor 300 is normal, and when Vdet is 1, the state of the motor 300 is abnormal, so that the fault detection of the motor 300 is realized, the motor 300 does not need to work and judge again, and the purpose of static judgment is achieved.
Here, it is to be noted that the determination of the state of the motor 300 using Vdet equal to 0 or Vdet equal to 1 is not particularly limited, and the state of the motor 300 may be normal when Vdet is equal to 0, abnormal when Vdet is equal to 1, abnormal in the state of the motor 300, abnormal when Vdet is equal to 0, and normal in the state of the motor 300 when Vdet is equal to 1.
In any of the above technical solutions, preferably, the household appliance is one of an electric cooker, an electric pressure cooker, a steamer, a fully automatic washing machine, a coffee maker and a water heater.
Example five:
fig. 5 shows a schematic block diagram of a household appliance according to an embodiment of the present invention.
As shown in fig. 5, a home appliance according to an embodiment of the present invention includes: the motor 300, the processor 602 and the memory 604 according to any of the above technical solutions, wherein the memory 604 stores a cooking control program, and when the processor 602 executes the cooking control program, the following steps can be implemented: after detecting that an electrifying signal is output to a winding coil of the motor, detecting a voltage signal of a common end between two voltage division elements in a detection circuit; and determining whether the motor can operate immediately according to the voltage signal.
In the technical scheme, after the electrifying signal is output to the winding coil of the motor, the voltage signal of the common end between the two voltage division elements in the detection circuit is detected, whether the motor can run immediately is further determined according to the voltage signal, the running capability of the motor can be detected in real time, when the motor is neglected to be installed or fails, the motor cannot run immediately, when the motor is correctly installed, the motor can run immediately, the detection scheme is reliable, and the cost for additionally arranging the detection circuit is low.
In any of the above technical solutions, preferably, determining whether the motor can run immediately according to the voltage signal specifically includes: when the voltage signal is detected to be identified as a high-level signal, determining that the motor cannot run immediately or is in a leakage connection state; and when the voltage signal is detected to be identified as a low level signal, determining that the motor can run immediately.
In the technical scheme, by referring to the setting mode and specific limited contents of the detection circuit, it is determined that the motor cannot run or is in a leakage connection state when the voltage signal is detected to be identified as a high-level signal, and in addition, the motor can run immediately when the voltage signal is detected to be identified as a low-level signal, so that the running capacity of the motor can be accurately and reliably detected, the detection efficiency is high, and the reliability of the whole household appliance is improved.
The technical scheme of the invention is described in detail by combining the attached drawings, and the invention provides a detection circuit, a motor detection method, a motor and a household appliance.
The steps in the method of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the device of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by instructions associated with hardware, and the programs may be stored in a computer-readable storage medium, which includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc-Read Only Memory (CD-ROM), or other Memory, magnetic disk, magnetic tape, or magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A detection circuit adapted for use with an electric machine, the detection circuit comprising:
the two access ports can be accessed to a winding coil of the motor, a first access port of the two access ports is grounded through a lead, and two voltage division elements are connected between a second access port of the two access ports and a direct current source in series;
the direct current blocking element is connected between the common end of the two voltage dividing elements and the ground wire;
the detection port of the control module is connected to a common end between the two voltage division elements and used for acquiring a real-time voltage signal of the common end, determining whether the motor can run instantly according to the voltage signal and detecting the running capacity of the motor;
a direct current signal input end connected to a direct current driving module, an output end of the direct current driving module is connected to one end of the winding coil, which is close to the second access port, through the direct current signal input end, and is used for outputting a direct current driving signal to the winding coil,
when the winding coil is connected to the direct current driving signal, the winding coil can be conducted in a wire form;
and before the motor is detected, determining that the direct current signal input end outputs a direct current driving signal to the motor.
2. The detection circuit of claim 1,
when the motor can run instantly, the winding coil is used as a lead to connect the two voltage dividing elements in series between the direct current source and the ground wire, the real-time voltage signal of the common end is a load voltage signal of a first voltage dividing element of the ground wire,
wherein the load voltage signal is recognizable by the control module as a low level signal.
3. The detection circuit of claim 2,
when the motor can not run instantly, the winding coil breaks the two voltage division elements, the real-time voltage signal of the common end is the direct current output signal of the direct current source,
wherein the DC output signal is recognizable by the control module as a high level signal.
4. The detection circuit of claim 3,
the ratio of the resistance value of the first voltage-dividing element to the resistance value of the second voltage-dividing element is less than or equal to three-seventh,
wherein the second voltage dividing element is the other one of the two voltage dividing elements connected with the direct current source.
5. The detection circuit of claim 4,
the ratio of the resistance value of the first voltage-dividing element to the resistance value of the second voltage-dividing element is greater than or equal to seven-thirds.
6. A motor detection method applied to the detection circuit according to any one of claims 1 to 5, characterized by comprising:
after detecting that an electrifying signal is output to a winding coil of the motor, detecting a voltage signal of a common end between two voltage division elements in the detection circuit;
and determining whether the motor can run immediately according to the voltage signal.
7. The motor detection method according to claim 6, wherein determining whether the motor is capable of running instantaneously according to the voltage signal specifically includes:
when the voltage signal is detected to be identified as a high-level signal, determining that the motor cannot be operated immediately or is in a leakage connection state;
and determining that the motor can be instantly operated when the voltage signal is detected to be identified as a low level signal.
8. An electric machine, comprising:
a winding coil;
the detection circuit of any one of claims 1 to 5, the detection circuit being accessible to the winding coil to detect whether the motor is ready to run.
9. A household appliance, comprising:
the electric motor as set forth in claim 8,
wherein the household appliance is one of an electric cooker, an electric pressure cooker, a garment steamer, a full-automatic washing machine, a coffee machine and a water heater.
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