CN108279338B - Household appliance and electromagnet driving detection method and device for household appliance - Google Patents
Household appliance and electromagnet driving detection method and device for household appliance Download PDFInfo
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- CN108279338B CN108279338B CN201710007780.6A CN201710007780A CN108279338B CN 108279338 B CN108279338 B CN 108279338B CN 201710007780 A CN201710007780 A CN 201710007780A CN 108279338 B CN108279338 B CN 108279338B
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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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- 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
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/0802—Control mechanisms for pressure-cookers
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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
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/09—Safety devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1253—Measuring galvano-magnetic properties
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- Condensed Matter Physics & Semiconductors (AREA)
- Air Conditioning Control Device (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses a household appliance, and an electromagnet driving detection method and device for the household appliance, wherein the method comprises the following steps: after receiving a fault detection instruction, respectively outputting a high level signal, a low level signal or a PWM signal to a first control port and a second control port; and acquiring a level signal of the other end of the electromagnet coil, and judging whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil. The method can effectively judge whether the electromagnet and the driving unit have faults according to the signal of the control port and the level signal of the electromagnet coil, thereby effectively avoiding the problem that the household appliance is abnormal or damaged due to the fact that the electromagnet or the driving unit still continues to work when being damaged.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to an electromagnet driving detection method for a household appliance, an electromagnet driving detection device for the household appliance and the household appliance with the device.
Background
At present, most of household appliances (such as electric cookers, electric pressure cookers and the like) with pressure in the market use electromagnets as pressure control devices. Therefore, the safety and reliability of the electromagnet drive are important. Most products on the market do not detect the working states of the electromagnet and the driving circuit of the electromagnet, and when the electromagnet or the driving circuit is abnormal, the system cannot obtain a feedback signal due to the lack of a safe and reliable detection mechanism, so that the system cannot perform corresponding processing, and certain risks are caused.
For example, when the electromagnet is controlled to work, the actual electromagnet is damaged and cannot be normally attracted, and the system can continue to work according to the normal state because the system cannot know the working state of the electromagnet, so that the final cooking effect is abnormal; when the electromagnet is controlled to be disconnected, if the electromagnet is damaged, the electromagnet cannot be normally disconnected, so that the product always works, and safety accidents are caused.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide an electromagnet driving detection method for a household appliance, which can effectively determine whether an electromagnet and a driving unit have a fault according to a signal of a control port and a level signal of an electromagnet coil, thereby effectively avoiding the problem of abnormality or damage of the household appliance caused by continuous operation when the electromagnet or the driving unit is damaged.
Another object of the present invention is to provide an electromagnet driving detecting device for a home appliance.
It is a further object of the invention to propose a household appliance.
In order to achieve the above object, an embodiment of an aspect of the present invention provides an electromagnet driving detection method for a household appliance, where a driving circuit of an electromagnet includes a first driving unit and a second driving unit, the first driving unit is disposed between one end of an electromagnet coil and a preset power supply, the second driving unit is disposed between the other end of the electromagnet coil and ground, a first resistor is further connected in parallel between one end of the electromagnet coil and the other end of the electromagnet coil, the first driving unit includes a first control port, and the second driving unit includes a second control port, and the method includes the following steps: after receiving a fault detection instruction, respectively outputting a high level signal, a low level signal or a PWM (pulse width Modulation) signal to the first control port and the second control port; and acquiring a level signal of the other end of the electromagnet coil, and judging whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil.
According to the electromagnet driving detection method for the household appliance, after a fault detection instruction is received, a high-level signal, a low-level signal or a PWM signal is respectively output to a first control port and a second control port, a level signal of the other end of an electromagnet coil is obtained, and whether the electromagnet, a first driving unit and a second driving unit have faults or not is judged according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil. The method can effectively judge whether the electromagnet and the driving unit have faults according to the signal of the control port and the level signal of the electromagnet coil, thereby effectively avoiding the problem that the household appliance is abnormal or damaged due to the fact that the electromagnet or the driving unit still continues to work when being damaged.
According to an embodiment of the present invention, the determining whether the electromagnet, the first driving unit, and the second driving unit have a failure according to the signal of the first control port, the signal of the second control port, and the level signal of the other end of the electromagnet coil includes: when the signals of the first control port and the second control port are both low level signals, if the level signal of the other end of the electromagnet coil is a high level signal, judging that the first driving unit has a fault; when the level signal of the first control port is a high level signal and the level signal of the second control port is a low level signal, if the level signal of the other end of the electromagnet coil is a low level signal, judging that the electromagnet fails; and when the signals of the first control port and the second control port are high level signals, if the level signal of the other end of the electromagnet coil is a high level signal, judging that the second driving unit has a fault.
According to another embodiment of the present invention, the determining whether the electromagnet, the first driving unit, and the second driving unit have a failure according to the signal of the first control port, the signal of the second control port, and the level signal of the other end of the electromagnet coil includes: when the signal that has one control port in first control port with the second control port is the PWM signal, and the signal of another control port is high level signal, or, when the signal of first control port with the second control port is the PWM signal, if the level signal of the other end of electromagnet coil with the PWM signal is in-phase, or the level signal of the other end of electromagnet coil is for lasting high level signal and lasting first preset time, or the level signal of the other end of electromagnet coil is for lasting low level signal and lasting first preset time, then judge the electro-magnet, first drive unit or the second drive unit breaks down.
According to an embodiment of the present invention, the first driving unit includes: a base electrode of the first NPN triode is connected with the first control port through a second resistor, the base electrode of the first NPN triode is also connected with an emitting electrode of the first NPN triode through a third resistor and then connected with the ground, and a collector electrode of the first NPN triode is connected with the preset power supply through a fourth resistor; the base electrode of the first PNP triode is connected with the collector electrode of the first NPN triode through a fifth resistor, the emitting electrode of the first PNP triode is connected with the preset power supply, and the collector electrode of the first PNP triode is connected with one end of the electromagnet coil.
According to an embodiment of the present invention, the second driving unit includes: and the base electrode of the second NPN triode is connected with the second control port through a sixth resistor, the base electrode of the second NPN triode is also connected with the emitting electrode of the second NPN triode through a seventh resistor and then is connected with the ground, and the collector electrode of the second NPN triode is connected with the other end of the electromagnet coil.
In order to achieve the above object, in another embodiment of the present invention, a driving circuit of an electromagnet for a household appliance includes a first driving unit and a second driving unit, the first driving unit is disposed between one end of an electromagnet coil and a preset power supply, the second driving unit is disposed between the other end of the electromagnet coil and ground, a first resistor is further connected in parallel between one end of the electromagnet coil and the other end of the electromagnet coil, the first driving unit includes a first control port, the second driving unit includes a second control port, and the detecting device includes: the acquisition unit is used for acquiring a level signal of the other end of the electromagnet coil; and the control unit is respectively connected with the acquisition unit, the first control port and the second control port, and is used for respectively outputting a high level signal, a low level signal or a PWM signal to the first control port and the second control port after receiving a fault detection instruction, and judging whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil.
According to the electromagnet driving detection device for the household appliance, after receiving the fault detection instruction, the control unit outputs a high-level signal, a low-level signal or a PWM signal to the first control port and the second control port respectively, and judges whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil. The device can effectively judge whether the electromagnet and the driving unit break down according to the signal of the control port and the level signal of the electromagnet coil, thereby effectively avoiding the problem that the household appliance is abnormal or damaged due to continuous work when the electromagnet or the driving unit is damaged.
According to an embodiment of the present invention, when the control unit determines whether the electromagnet, the first driving unit, and the second driving unit have a fault according to a signal of the first control port, a signal of the second control port, and a level signal of the other end of the electromagnet coil, the control unit determines that the first driving unit has a fault if the level signal of the other end of the electromagnet coil is a high level signal when the signals of the first control port and the second control port are both low level signals; when the level signal of the first control port is a high level signal and the level signal of the second control port is a low level signal, if the level signal of the other end of the electromagnet coil is a low level signal, the control unit judges that the electromagnet fails; when the signals of the first control port and the second control port are both high level signals, if the level signal of the other end of the electromagnet coil is a high level signal, the control unit judges that the second driving unit has a fault.
According to another embodiment of the present invention, when the control unit determines whether the electromagnet, the first driving unit and the second driving unit have a fault according to a signal of the first control port, a signal of the second control port and a level signal of the other end of the electromagnet coil, wherein when one of the first control port and the second control port is a PWM signal and the other control port is a high level signal, or both the first control port and the second control port are PWM signals, if the level signal of the other end of the electromagnet coil is in phase with the PWM signal, or the level signal of the other end of the electromagnet coil is a high level signal and continues for a first preset time, or the level signal of the other end of the electromagnet coil is a low level signal and continues for the first preset time, the control unit judges that the electromagnet, the first driving unit or the second driving unit has a fault.
According to an embodiment of the present invention, the first driving unit includes: a base electrode of the first NPN triode is connected with the first control port through a second resistor, the base electrode of the first NPN triode is also connected with an emitting electrode of the first NPN triode through a third resistor and then connected with the ground, and a collector electrode of the first NPN triode is connected with the preset power supply through a fourth resistor; the base electrode of the first PNP triode is connected with the collector electrode of the first NPN triode through a fifth resistor, the emitting electrode of the first PNP triode is connected with the preset power supply, and the collector electrode of the first PNP triode is connected with one end of the electromagnet coil.
According to an embodiment of the present invention, the second driving unit includes: and the base electrode of the second NPN triode is connected with the second control port through a sixth resistor, the base electrode of the second NPN triode is also connected with the emitting electrode of the second NPN triode through a seventh resistor and then is connected with the ground, and the collector electrode of the second NPN triode is connected with the other end of the electromagnet coil.
In addition, the embodiment of the invention also provides a household appliance, which comprises the electromagnet driving detection device for the household appliance.
According to the household appliance provided by the embodiment of the invention, through the drive detection device, whether the electromagnet and the drive unit have faults or not can be effectively judged according to the signal of the control port and the level signal of the electromagnet coil, so that the problem that the household appliance is abnormal or damaged due to the fact that the household appliance continues to work when the electromagnet or the drive unit is damaged is effectively avoided, and the safety and reliability of the household appliance are improved.
Drawings
Fig. 1 is a flowchart of an electromagnet driving detecting method for a home appliance according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an electromagnet driving detecting apparatus for home appliances according to an embodiment of the present invention; and
fig. 3 is a circuit diagram of an electromagnet driving detecting apparatus for a home appliance according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electromagnet driving detecting method for a home appliance, an electromagnet driving detecting device for a home appliance, and a home appliance having the same according to embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an electromagnet driving detecting method for a home appliance according to an embodiment of the present invention.
In an embodiment of the present invention, as shown in fig. 2, the driving circuit of the electromagnet includes a first driving unit and a second driving unit, the first driving unit is disposed between one end of the electromagnet coil and a preset power supply, the second driving unit is disposed between the other end of the electromagnet coil and ground, a first resistor is further connected in parallel between one end of the electromagnet coil and the other end of the electromagnet coil, the first driving unit includes a first control port, and the second driving unit includes a second control port. The first resistor is a high-resistance resistor.
In one embodiment of the present invention, as shown in fig. 3, the first driving unit may include: the first NPN triode, the first PNP triode, the second resistor to the fifth resistor. The base electrode of the first NPN triode is connected with the first control port through a second resistor, the base electrode of the first NPN triode is also connected with the emitting electrode of the first NPN triode through a third resistor and then grounded, and the collector electrode of the first NPN triode is connected with a preset power supply through a fourth resistor. The base electrode of the first PNP triode is connected with the collector electrode of the first NPN triode through the fifth resistor, the emitting electrode of the first PNP triode is connected with the preset power supply, and the collector electrode of the first PNP triode is connected with one end of the electromagnet coil.
Further, as shown in fig. 3, the second driving unit may include: the base electrode of the second NPN triode is connected with the second control port through the sixth resistor, the base electrode of the second NPN triode is also connected with the emitting electrode of the second NPN triode through the seventh resistor and then grounded, and the collector electrode of the second NPN triode is connected with the other end of the electromagnet coil.
It should be noted that fig. 3 is only an example of the present invention, and other circuit structures may be adopted for the first driving unit and the second driving unit, and are not limited herein.
As shown in fig. 1, the electromagnet driving detecting method for a home appliance may include the steps of:
and S1, after receiving the fault detection instruction, respectively outputting a high level signal, a low level signal or a PWM signal to the first control port and the second control port.
And S2, acquiring a level signal of the other end of the electromagnet coil, and judging whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil.
According to an embodiment of the present invention, determining whether the electromagnet, the first driving unit, and the second driving unit are malfunctioning based on a signal of the first control port, a signal of the second control port, and a level signal of the other end of the electromagnet coil includes: when the signals of the first control port and the second control port are low level signals, if the level signal of the other end of the electromagnet coil is a high level signal, judging that the first driving unit has a fault; when the level signal of the first control port is a high level signal and the level signal of the second control port is a low level signal, if the level signal of the other end of the electromagnet coil is a low level signal, judging that the electromagnet breaks down; and when the signals of the first control port and the second control port are high level signals, if the level signal of the other end of the electromagnet coil is a high level signal, judging that the second driving unit has a fault.
Specifically, as shown in FIG. 2, Sol _ Ctrl1 is a first control port and Sol _ Ctrl2 is a second control port. When the electromagnet, the first driving unit and the second driving unit are all in normal state, high level signals are respectively output to the first control port and the second control port when a work starting instruction of the electromagnet is received, so that the electromagnet is effectively attracted, and the electromagnet starts to work. In the working process of the electromagnet, a high level signal or a PWM signal can be output to the second control port, and meanwhile, the high level signal is continuously output to the first control port, so that the electromagnet is kept in a suction state. When a stop working instruction of the electromagnet is received, low level signals are respectively output to the first control port and the second control port, so that the electromagnet is disconnected, and the electromagnet stops working.
After receiving a fault detection instruction of the electromagnet, when a low level signal is respectively output to the first control port and the second control port, under a normal condition, the first driving unit is in a disconnected state, one end of the electromagnet coil is disconnected with a preset power supply, meanwhile, the second driving unit is in a disconnected state, the other end of the electromagnet coil is disconnected with the ground, and at the moment, if a high level signal is detected at the other end of the electromagnet coil, it can be judged that the first driving unit is in a fault, and if the first driving unit is in a short-circuit fault.
When a high level signal is output to the first control port and a low level signal is output to the second control port, under normal conditions, the first driving unit is in a conducting state, a preset power supply is applied to one end of the electromagnet coil, the second driving unit is in a disconnecting state, the other end of the electromagnet coil is disconnected with the ground, and if the other end of the electromagnet coil is detected to be the low level signal at the moment, the electromagnet can be judged to be in fault, such as open-circuit fault of the electromagnet. Specifically, if the detected level signal is almost 0, it may be that the second driving unit malfunctions, such as a short-circuit malfunction of the second driving unit.
When high level signals are respectively output to the first control port and the second control port, under normal conditions, the first driving unit and the second driving unit are both in a conducting state, the electromagnet coil is electrified and attracted, if the high level signals are detected at the moment, the second driving unit can be judged to be in fault, and if the second driving unit is in open-circuit fault, the second driving unit can be judged to be in fault.
Further, as shown in fig. 3, when the signals of the first control port and the second control port are both low level signals, under normal conditions, the first NPN transistor, the first PNP transistor, and the second NPN transistor are all in a cut-off state, and at this time, if it is detected that the level signal of the other end of the electromagnet coil is a high level signal, it may be determined that the first driving unit has a fault, for example, the first PNP transistor has a short circuit fault.
When the first control port is a high level signal and the second control port is a low level signal, the first NPN triode and the first PNP triode are both in a conducting state and the second NPN triode is in a disconnecting state under normal conditions, and at this time, if the other end of the electromagnet coil is detected to be a low level signal, it can be determined that the electromagnet has a fault, for example, an open circuit fault occurs to the electromagnet. Specifically, if the detected level signal is almost 0, it may be that the second driving unit malfunctions, for example, the second NPN transistor malfunctions.
When the signals of the first control port and the second control port are high-level signals, under a normal condition, the first NPN triode, the first PNP triode and the second NPN triode are all in a conducting state, the electromagnet coil is electrified and attracted, and at the moment, if the other end of the electromagnet coil is detected to be a high-level signal, the second driving unit can be judged to have a fault, and if the second NPN triode has an open-circuit fault.
When the electromagnet, the first driving unit or the second driving unit is judged to have faults, the relevant working circuit is also cut off to stop the household appliance, and meanwhile, an alarm prompt is sent out through a display interface or a sound module of the household appliance to prompt a user to maintain.
Therefore, according to the electromagnet driving detection method for the household appliance, whether the electromagnet and the driving unit have faults or not can be effectively detected according to the signal of the control port and the level signal of the electromagnet coil, so that the working states of the electromagnet and the driving unit can be monitored in an all-around mode, after the electromagnet or the driving unit is detected to have faults, corresponding measures are taken in time to protect the household appliance, meanwhile, an error prompt is sent to remind a user of maintenance, and the working reliability and safety of the household appliance are guaranteed.
The first control port and the second control port may be driven not only by high-level and low-level driving methods but also by PWM signals.
According to an embodiment of the present invention, determining whether the electromagnet, the first driving unit, and the second driving unit are malfunctioning based on a signal of the first control port, a signal of the second control port, and a level signal of the other end of the electromagnet coil includes: when the signal of one control port of the first control port and the second control port is a PWM signal and the signal of the other control port is a high level signal, or the signals of the first control port and the second control port are both PWM signals, if the level signal of the other end of the electromagnet coil is in phase with the PWM signal, or the level signal of the other end of the electromagnet coil is a continuous high level signal and lasts for a first preset time, or the level signal of the other end of the electromagnet coil is a continuous low level signal and lasts for a first preset time, it is determined that the electromagnet, the first driving unit or the second driving unit has a fault. The first preset time can be calibrated according to actual conditions.
Specifically, when the signal of the first control port is a PWM signal and the signal of the second control port is a high level signal, or the signal of the first control port is a high level signal and the signal of the second control port is a PWM signal, or both the signal of the first control port and the signal of the second control port are PWM signals, if it is detected that the level signal of the other end of the electromagnet coil is in phase with the PWM signal, or it is detected that the level signal of the other end of the electromagnet coil is a high level signal and lasts for a first preset time, or it is detected that the level signal of the other end of the electromagnet coil is a low level and lasts for a first preset time, it is determined that the electromagnet, the first driving unit, or the second driving unit has a fault, and at this time, the driving signals of the first control port and the second control port are turned off, and a related working circuit of the household appliance is turned off to protect the household appliance, and meanwhile, sending an alarm prompt to remind a user of maintenance. The first preset time is greater than the period of the PWM signal.
In summary, according to the electromagnet driving detection method for a household appliance in the embodiment of the present invention, after receiving a fault detection instruction, a high level signal, a low level signal or a PWM signal is output to the first control port and the second control port, respectively, and a level signal of the other end of the electromagnet coil is obtained, and whether the electromagnet, the first driving unit, and the second driving unit have a fault is determined according to the signal of the first control port, the signal of the second control port, and the level signal of the other end of the electromagnet coil. The method can effectively judge whether the electromagnet and the driving unit have faults according to the signal of the control port and the level signal of the electromagnet coil, thereby effectively avoiding the problem that the household appliance is abnormal or damaged due to the fact that the electromagnet or the driving unit still continues to work when being damaged.
Fig. 2 is a schematic structural view of an electromagnet driving detecting apparatus for home appliances according to an embodiment of the present invention.
As shown in fig. 2, the driving circuit of the electromagnet may include a first driving unit 10 and a second driving unit 20, wherein the first driving unit 10 is disposed between one end of the coil of the electromagnet 30 and a preset power VCC, the second driving unit 20 is disposed between the other end of the coil of the electromagnet 30 and a ground GND, a first resistor R1 is further connected in parallel between the one end of the coil of the electromagnet 30 and the other end of the coil of the electromagnet 30, the first driving unit 10 includes a first control port Sol _ Ctrl1, and the second driving unit 20 includes a second control port Sol _ Ctrl 2. In order to prevent damage to the coil when the electromagnet 30 is powered off, a diode D1 is connected in parallel with the coil of the electromagnet 30 to freewheel when the electromagnet 30 is powered off.
The electromagnet drive detection means may include an acquisition unit 40 and a control unit (not specifically shown in the drawings). The acquiring unit 40 is used for acquiring a level signal of the other end of the coil of the electromagnet 30, the control unit is respectively connected with the acquiring unit 40, the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2, the control unit is used for outputting a high level signal, a low level signal or a PWM signal to the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 after receiving a fault detection instruction, and judging whether the electromagnet 30, the first driving unit 10 and the second driving unit 20 have faults or not according to a signal of the first control port Sol _ Ctrl1, a signal of the second control port Sol _ Ctrl2 and the level signal of the other end of the coil of the electromagnet 30.
According to an embodiment of the present invention, when the control unit determines whether the electromagnet 30, the first driving unit 10 and the second driving unit 20 are failed according to the signal of the first control port Sol _ Ctrl1, the signal of the second control port Sol _ Ctrl2 and the level signal of the other end of the coil of the electromagnet 30, when the signals of the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 are both low level signals, if the level signal of the other end of the coil of the electromagnet 30 is a high level signal, the control unit determines that the first driving unit 10 is failed; when the level signal of the first control port Sol _ Ctrl1 is a high level signal and the level signal of the second control port Sol _ Ctrl2 is a low level signal, if the level signal of the other end of the coil of the electromagnet 30 is a low level signal, the control unit determines that the electromagnet 30 has a fault; when the signals of the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 are both high level signals, if the level signal of the other end of the coil of the electromagnet 30 is a high level signal, the control unit determines that the second driving unit 20 has a fault.
Specifically, as shown in fig. 2, when the electromagnet 30, the first driving unit 10, and the second driving unit 20 are all normal, the control unit outputs a high level signal to the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 when receiving an instruction to start operation of the electromagnet 30, so that the electromagnet 30 is effectively attracted and the electromagnet 30 starts to operate. During the operation of the electromagnet 30, a high level signal or a PWM signal can be output to the second control port Sol _ Ctrl2, while a high level signal is continuously output to the first control port Sol _ Ctrl1, so that the electromagnet 30 is kept in the attraction state. When receiving the stop command of the electromagnet 30, the low level signals are respectively output to the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2, so that the electromagnet 30 is switched off, and the electromagnet 30 stops working.
After receiving the fault detection instruction of the electromagnet 30, the control unit outputs a high level signal or a low level signal to the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 respectively, so as to realize electromagnet drive detection.
When the control unit respectively outputs a low level signal to the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2, under normal conditions, the first driving unit 10 is in an off state, one end of the coil of the electromagnet 30 is disconnected from the preset power VCC, meanwhile, the second driving unit 20 is in an off state, and the other end of the coil of the electromagnet 30 is disconnected from the ground GND, at this time, if the control unit detects a high level signal at the other end of the coil of the electromagnet 30 through the obtaining unit 40, it can be determined that the first driving unit 10 has a fault, for example, the first driving unit 10 has a short-circuit fault.
When the control unit outputs a high level signal to the first control port Sol _ Ctrl1 and outputs a low level signal to the second control port Sol _ Ctrl2, under normal conditions, the first driving unit 10 is in an on state, the preset power VCC is applied to one end of the coil of the electromagnet 30, the second driving unit 20 is in an off state, and the other end of the coil of the electromagnet 30 is disconnected from the ground GND, at this time, if the control unit detects that the other end of the coil of the electromagnet is the low level signal through the obtaining unit 40, it can be determined that the electromagnet 30 has a fault, for example, the electromagnet 30 has an open circuit fault. Specifically, if the detected level signal is almost 0, it may be that the second driving unit 20 malfunctions, such as that the second driving unit 20 malfunctions by short circuit.
When the control unit respectively outputs a high level signal to the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2, under a normal condition, the first driving unit 10 and the second driving unit 20 are both in a conducting state, the coil of the electromagnet 30 is electrified and attracted, and at this time, if the control unit detects that the other end of the coil of the electromagnet 30 is the high level signal through the obtaining unit 40, it can be determined that the second driving unit 20 has a fault, such as an open circuit fault of the second driving unit 20.
According to an embodiment of the present invention, as shown in fig. 3, the first driving unit 10 may include: the circuit comprises a first NPN triode Q1, a first PNP triode Q2, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5. The base of the first NPN triode Q1 is connected to the first control port Sol _ Ctrl1 through the second resistor R2, the base of the first NPN triode Q1 is further connected to the emitter of the first NPN triode Q1 through the third resistor R3 and then grounded to GND, and the collector of the first NPN triode Q1 is connected to the preset power VCC through the fourth resistor R4. The base of the first PNP triode Q2 is connected to the collector of the first NPN triode Q1 through the fifth resistor R5, the emitter of the first PNP triode Q2 is connected to the preset power VCC, and the collector of the first PNP triode Q2 is connected to one end of the coil of the electromagnet 30.
Further, as shown in fig. 3, the second driving unit 20 may include: a second NPN transistor Q3, a sixth resistor R6, and a seventh resistor R7. The base of the second NPN triode Q3 is connected to the second control port Sol _ Ctrl2 through a sixth resistor R6, the base of the second NPN triode Q3 is also connected to the emitter of the second NPN triode Q3 through a seventh resistor R7 and then grounded to GND, and the collector of the second NPN triode Q3 is connected to the other end of the coil of the electromagnet 30.
As shown in fig. 3, when the signals of the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 are both low level signals, under normal conditions, the first NPN triode Q1, the first PNP triode Q2, and the second NPN triode Q3 are all in a cut-off state, and at this time, if the control unit detects that the level signal at the other end of the coil of the electromagnet 30 is a high level signal through the obtaining unit 40, it can be determined that the first driving unit 10 has a fault, for example, the first PNP triode Q2 has a short circuit fault.
When the first control port Sol _ Ctrl1 is a high level signal and the second control port Sol _ Ctrl2 is a low level signal, under normal conditions, both the first NPN transistor Q1 and the first PNP transistor Q2 are in a conducting state, and the second NPN transistor Q3 is in a disconnecting state, at this time, if the control unit detects that the other end of the coil of the electromagnet 30 is a low level signal through the obtaining unit 40, it can be determined that the electromagnet 30 has a fault, for example, the electromagnet 30 has an open circuit fault. Specifically, if the detected level signal is almost 0, it may be that the second driving unit 20 has failed, such as the second NPN transistor Q3 has a short-circuit failure.
When the signals of the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 are both high-level signals, under a normal condition, the first NPN triode Q1, the first PNP triode Q2, and the second NPN triode Q3 are all in a conducting state, the coil of the electromagnet 30 is electrified and attracted, and at this time, if the control unit detects that the other end of the coil of the electromagnet 30 is a high-level signal through the acquisition unit 40, it can be determined that the second drive unit 20 has a fault, for example, the second triode NPN Q3 has an open-circuit fault.
Finally, when the control unit judges that the electromagnet 30, the first driving unit 10 or the second driving unit 20 has a fault, the control unit also cuts off the relevant working circuit to stop the household appliance, and simultaneously sends out an alarm prompt through a display interface or a sound module of the household appliance to prompt a user to maintain.
Therefore, according to the electromagnet driving detection device for the household appliance, provided by the embodiment of the invention, whether the electromagnet and the driving unit have faults or not can be effectively detected by controlling signals of the port and level signals of the electromagnet coil, so that the working states of the electromagnet and the driving unit can be comprehensively monitored, after the electromagnet or the driving unit is detected to have faults, corresponding measures are timely adopted to protect the household appliance, and meanwhile, an error prompt is sent to remind a user of maintenance, so that the working reliability and the safety of the household appliance are ensured.
The first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 may be driven by not only a high-level signal and a low-level signal but also a PWM signal.
According to an embodiment of the present invention, when the control unit determines whether the electromagnet 30, the first driving unit 10 and the second driving unit 20 have a fault according to the signal of the first control port Sol _ Ctrl1, the signal of the second control port Sol _ Ctrl1 and the level signal of the other end of the coil of the electromagnet 30, wherein when the signal of one of the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 is a PWM signal and the signal of the other control port is a high level signal, or when the signals of the first control port Sol _ Ctrl1 and the second control port Sol _ Ctrl2 are both PWM signals, if the level signal of the other end of the coil of the electromagnet 30 is in phase with the PWM signal, or the level signal of the other end of the coil of the electromagnet 30 is a continuous high level signal and continues for a first preset time, or the level signal of the other end of the coil of the electromagnet 30 is a continuous low level signal and continues for a first preset time, the control unit determines that the electromagnet 30, the first drive unit 10, or the second drive unit 20 has failed.
Specifically, when the signal of the first control port Sol _ Ctrl1 is a PWM signal and the signal of the second control port Sol _ Ctrl2 is a high level signal, or the signal of the first control port Sol _ Ctrl1 is a high level signal and the signal of the second control port Sol _ Ctrl2 is a PWM signal, or the signal of the first control port Sol _ Ctrl1 and the signal of the second control port Sol _ Ctrl2 are both PWM signals, if the control unit detects that the level signal of the other end of the coil of the electromagnet 30 is in phase with the PWM signal through the acquisition unit 40, or detects that the level signal of the other end of the coil of the electromagnet 30 is a high level signal and continues for a first preset time, or detects that the level signal of the other end of the coil of the electromagnet 30 is a low level and continues for a first preset time, it determines that the electromagnet 30, the first drive unit 10, or the second drive unit 20 has a failure, and at this time, the control unit closes the drive ports of the first control port Sol _ Ctrl1 and the second control port Sol _ 2, and the related working circuit of the household appliance is cut off to protect the household appliance, and meanwhile, an alarm prompt is sent out to remind a user of maintenance. The first preset time is greater than the period of the PWM signal.
According to the electromagnet driving detection device for the household appliance, after receiving the fault detection instruction, the control unit outputs a high level signal, a low level signal or a PWM signal to the first control port and the second control port respectively, and judges whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil. The device can effectively judge whether the electromagnet and the driving unit break down according to the signal of the control port and the level signal of the electromagnet coil, thereby effectively avoiding the problem that the household appliance is abnormal or damaged due to continuous work when the electromagnet or the driving unit is damaged.
In addition, the embodiment of the invention also provides a household appliance, which comprises the electromagnet driving detection device for the household appliance.
According to the household appliance provided by the embodiment of the invention, through the drive detection device, whether the electromagnet and the drive unit have faults or not can be effectively judged according to the signal of the control port and the level signal of the electromagnet coil, so that the problem that the household appliance is abnormal or damaged due to the fact that the household appliance continues to work when the electromagnet or the drive unit is damaged is effectively avoided, and the safety and reliability of the household appliance are improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. The electromagnet driving detection method for the household appliance is characterized in that a driving circuit of an electromagnet comprises a first driving unit and a second driving unit, the first driving unit is arranged between one end of an electromagnet coil and a preset power supply, the second driving unit is arranged between the other end of the electromagnet coil and the ground, a first resistor is further connected between one end of the electromagnet coil and the other end of the electromagnet coil in parallel, the first driving unit comprises a first control port, the second driving unit comprises a second control port, and the method comprises the following steps:
after receiving a fault detection instruction, respectively outputting a high level signal, a low level signal or a PWM signal to the first control port and the second control port;
and acquiring a level signal of the other end of the electromagnet coil, and judging whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil.
2. The electromagnet driving detecting method for home appliances according to claim 1, wherein judging whether the electromagnet, the first driving unit and the second driving unit are malfunctioning according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil comprises:
when the signals of the first control port and the second control port are both low level signals, if the level signal of the other end of the electromagnet coil is a high level signal, judging that the first driving unit has a fault;
when the level signal of the first control port is a high level signal and the level signal of the second control port is a low level signal, if the level signal of the other end of the electromagnet coil is a low level signal, judging that the electromagnet fails;
and when the signals of the first control port and the second control port are high level signals, if the level signal of the other end of the electromagnet coil is a high level signal, judging that the second driving unit has a fault.
3. The electromagnet driving detecting method for home appliances according to claim 1, wherein judging whether the electromagnet, the first driving unit and the second driving unit are malfunctioning according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil comprises:
when the signal that has one control port in first control port with the second control port is the PWM signal, and the signal of another control port is high level signal, or, when the signal of first control port with the second control port is the PWM signal, if the level signal of the other end of electromagnet coil with the PWM signal is in-phase, or the level signal of the other end of electromagnet coil is for lasting high level signal and lasting first preset time, or the level signal of the other end of electromagnet coil is for lasting low level signal and lasting first preset time, then judge the electro-magnet, first drive unit or the second drive unit breaks down.
4. The electromagnet driving detecting method for home appliances according to any one of claims 1 to 3, wherein the first driving unit comprises:
a base electrode of the first NPN triode is connected with the first control port through a second resistor, the base electrode of the first NPN triode is also connected with an emitting electrode of the first NPN triode through a third resistor and then connected with the ground, and a collector electrode of the first NPN triode is connected with the preset power supply through a fourth resistor;
the base electrode of the first PNP triode is connected with the collector electrode of the first NPN triode through a fifth resistor, the emitting electrode of the first PNP triode is connected with the preset power supply, and the collector electrode of the first PNP triode is connected with one end of the electromagnet coil.
5. The electromagnet driving detecting method for home appliances according to claim 4, wherein the second driving unit comprises:
and the base electrode of the second NPN triode is connected with the second control port through a sixth resistor, the base electrode of the second NPN triode is also connected with the emitting electrode of the second NPN triode through a seventh resistor and then is connected with the ground, and the collector electrode of the second NPN triode is connected with the other end of the electromagnet coil.
6. The utility model provides an electro-magnet drive detection device for domestic appliance, a serial communication port, the drive circuit of electro-magnet includes first drive unit and second drive unit, first drive unit sets up between the one end of electromagnet coil and predetermines the power, the second drive unit sets up between the other end of electromagnet coil and ground, the one end of electromagnet coil with it has first resistance still to connect in parallel between the other end of electromagnet coil, first drive unit includes first control port, the second drive unit includes second control port, detection device includes:
the acquisition unit is used for acquiring a level signal of the other end of the electromagnet coil;
and the control unit is respectively connected with the acquisition unit, the first control port and the second control port, and is used for respectively outputting a high level signal, a low level signal or a PWM signal to the first control port and the second control port after receiving a fault detection instruction, and judging whether the electromagnet, the first driving unit and the second driving unit have faults or not according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil.
7. The electromagnet driving detecting apparatus for home appliances according to claim 6, wherein when the control unit judges whether the electromagnet, the first driving unit and the second driving unit have a malfunction according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil, wherein,
when the signals of the first control port and the second control port are both low level signals, if the level signal of the other end of the electromagnet coil is a high level signal, the control unit judges that the first driving unit has a fault;
when the level signal of the first control port is a high level signal and the level signal of the second control port is a low level signal, if the level signal of the other end of the electromagnet coil is a low level signal, the control unit judges that the electromagnet fails;
when the signals of the first control port and the second control port are both high level signals, if the level signal of the other end of the electromagnet coil is a high level signal, the control unit judges that the second driving unit has a fault.
8. The electromagnet driving detecting apparatus for home appliances according to claim 6, wherein when the control unit judges whether the electromagnet, the first driving unit and the second driving unit have a malfunction according to the signal of the first control port, the signal of the second control port and the level signal of the other end of the electromagnet coil, wherein,
when the signal of one control port in the first control port and the second control port is a PWM signal, and the signal of the other control port is a high level signal, or when the signals of the first control port and the second control port are both PWM signals, if the level signal of the other end of the electromagnet coil is in phase with the PWM signal, or the level signal of the other end of the electromagnet coil is a continuous high level signal and lasts for a first preset time, or the level signal of the other end of the electromagnet coil is a continuous low level signal and lasts for the first preset time, the control unit judges that the electromagnet, the first driving unit or the second driving unit has a fault.
9. The electromagnet driving detection apparatus for home appliances according to any one of claims 6 to 8, wherein the first driving unit comprises:
a base electrode of the first NPN triode is connected with the first control port through a second resistor, the base electrode of the first NPN triode is also connected with an emitting electrode of the first NPN triode through a third resistor and then connected with the ground, and a collector electrode of the first NPN triode is connected with the preset power supply through a fourth resistor;
the base electrode of the first PNP triode is connected with the collector electrode of the first NPN triode through a fifth resistor, the emitting electrode of the first PNP triode is connected with the preset power supply, and the collector electrode of the first PNP triode is connected with one end of the electromagnet coil.
10. The electromagnet driving detecting apparatus for electric home appliances according to claim 9, wherein the second driving unit comprises:
and the base electrode of the second NPN triode is connected with the second control port through a sixth resistor, the base electrode of the second NPN triode is also connected with the emitting electrode of the second NPN triode through a seventh resistor and then is connected with the ground, and the collector electrode of the second NPN triode is connected with the other end of the electromagnet coil.
11. A household appliance comprising an electromagnet actuation detection device for a household appliance according to any one of claims 6 to 10.
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| CN109700309B (en) * | 2017-10-25 | 2021-05-11 | 佛山市顺德区美的电热电器制造有限公司 | Fault detection method, fault detection device, cooking appliance and computer-readable storage medium |
| CN111110003A (en) * | 2018-10-31 | 2020-05-08 | 佛山市顺德区美的电热电器制造有限公司 | Cooking control method, cooking control apparatus, cooking appliance, and computer-readable storage medium |
| CN111123095B (en) * | 2018-10-31 | 2022-09-27 | 佛山市顺德区美的电热电器制造有限公司 | Detection circuit, motor detection method, motor and household appliance |
| CN113030673A (en) * | 2021-02-24 | 2021-06-25 | 中科新松有限公司 | Electromagnet control circuit and detection method thereof |
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