CN114060298B - Control circuit and method of electric fan - Google Patents
Control circuit and method of electric fan Download PDFInfo
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- CN114060298B CN114060298B CN202010770518.9A CN202010770518A CN114060298B CN 114060298 B CN114060298 B CN 114060298B CN 202010770518 A CN202010770518 A CN 202010770518A CN 114060298 B CN114060298 B CN 114060298B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004804 winding Methods 0.000 claims abstract description 48
- 239000003990 capacitor Substances 0.000 claims description 37
- 230000002051 biphasic effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 11
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004091 panning Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/10—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provisions for automatically changing direction of output air
- F04D25/105—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provisions for automatically changing direction of output air by changing rotor axis direction, e.g. oscillating fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Stepping Motors (AREA)
Abstract
The embodiment of the application discloses a control circuit and a method of an electric fan, wherein the control circuit of the electric fan comprises the following components: the device comprises a controller, an N-phase stepping motor and a main control circuit, wherein the main control circuit comprises N control modules, and each control module comprises a driving tube, a protection resistor and a voltage dividing circuit; the collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with the output end of a phase motor winding of the N-phase stepping motor, the emitter of the driving tube is grounded with the grounding end of the voltage dividing circuit, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller.
Description
Technical Field
The application relates to the technical field of household appliances, in particular to a control circuit and a control method of an electric fan.
Background
The electric fan is an electric appliance commonly used in summer and generally comprises a positioning system, a head shaking mechanism, a limiting device and the like. The limiting device is used for limiting the shaking range of the shaking mechanism, the positioning system can position the shaking mechanism in different angle ranges when the shaking mechanism rotates, and when the positioning system recognizes that the shaking mechanism rotates to the boundary position of the shaking range (namely the set maximum shaking angle), the shaking mechanism rotates backwards through resetting.
The positioning system in the related art generally includes a hall sensor, a magnet, etc., in addition to a controller. The positioning system in the related art has the following disadvantages: 1) Because the Hall sensor and the magnet are arranged, the circuit structure of the positioning system is complex, and the cost is high; 2) The electric fan needs to realize rotation of 30, 60, 90, 120 degrees and other angles, the initial position (0 degrees) needs to be reset firstly, in the resetting process, the oscillating mechanism needs different resetting time at different positions, and the maximum time is possibly 15 seconds, so that the energy efficiency utilization rate of the electric fan is low; the locked rotor can further increase the load of the gear, and if the locked rotor is locked for a long time, the problem that the oscillating mechanism gives out abnormal sound is easily caused.
Disclosure of Invention
The embodiment of the application provides a control circuit and a control method of an electric fan.
The technical scheme of the application is realized as follows:
in one aspect, an embodiment of the present application provides a control circuit for an electric fan, including:
the controller comprises M connecting ends;
an N-phase stepper motor; wherein M, N is an integer of 2 or more;
the main control circuit comprises N control modules, wherein each control module comprises a driving tube, a protection resistor and a voltage dividing circuit;
The collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with the output end of a phase motor winding of the N-phase stepping motor, the emitter of the driving tube and the grounding end of the voltage dividing circuit are grounded, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller.
On the other hand, the embodiment of the application provides a control method of an electric fan, which is applied to a control circuit of the electric fan, wherein the control circuit of the electric fan comprises an N-phase stepping motor, a controller and a main control circuit, and the controller comprises M connecting ends; the main control circuit comprises N control modules, and each control module comprises a driving tube, a protection resistor and a voltage dividing circuit;
the collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with the output end of a one-phase motor winding of the N-phase stepping motor, the emitter of the driving tube is grounded with the grounding end of the voltage dividing circuit, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller;
The method comprises the following steps:
the controller sequentially controls different connecting ends to output a voltage control signal in a corresponding beat in a period taking continuous N beats as one period, and controls the corresponding connecting ends to receive the voltage value output by the voltage dividing circuit in other (N-1) beats;
the controller determines that the N-phase stepping motor is locked according to the voltage value output by the voltage dividing circuit;
the controller determines an angle corresponding to the N-phase stepping motor when locked rotation occurs as a reset angle;
and the controller controls the N-phase stepping motor to rotate according to the reset angle.
In the technical scheme provided by the embodiment of the application, firstly, the controller outputs a voltage control signal through the connecting end to control the N-phase stepping motor to rotate, and the connecting end detects the voltage value output by the voltage dividing circuit to determine the blocking of the N-phase stepping motor, so that the circuit structure is simplified, the implementation is easier, and the cost is low because devices such as a Hall sensor and a magnet are not required to be arranged; secondly, the controller automatically judges whether the N-phase stepping motor is blocked by detecting the reverse voltage of the motor winding, and determines the corresponding angle of the N-phase stepping motor as a reset angle according to the judging result when the N-phase stepping motor is blocked, the whole process can be completed only in a short time, so that the rotating head mechanism can be quickly reset after rotating to the boundary position, the smooth rotation of the rotating head mechanism is realized, the blocking phenomenon of the rotating head mechanism is avoided, and the energy efficiency utilization rate of the electric fan is improved; and the problem of abnormal sound caused by locked rotor can be avoided.
Drawings
FIG. 1 is a schematic diagram of a related art panning mechanism;
FIG. 2 is a schematic diagram of a positioning system in the related art;
fig. 3 is a schematic structural diagram of a control circuit of an electric fan according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a control circuit of an electric fan according to an embodiment of the present application;
fig. 5 is a flow chart of a control method of an electric fan according to an embodiment of the present application;
fig. 6 is a flow chart of a control method of an electric fan according to an embodiment of the present application;
fig. 7 is a flow chart of a control method of an electric fan according to an embodiment of the present application;
fig. 8 is a flow chart of a control method of an electric fan according to an embodiment of the present application;
fig. 9 is a schematic diagram of an operation timing sequence of a stepper motor according to an embodiment of the present application.
Detailed Description
The technical solution of the present application will be further elaborated with reference to the accompanying drawings and examples, which should not be construed as limiting the application, but all other embodiments which can be obtained by one skilled in the art without making inventive efforts are within the scope of protection of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
If a similar description of "first/second" appears in the application document, the following description is added, in which the terms "first/second/third" merely distinguish similar objects and do not represent a specific ordering of the objects, it being understood that the "first/second/third" may, where allowed, interchange a specific order or precedence order such that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the application only and is not intended to be limiting of the application.
In the related art, as shown in fig. 1 and 2, an electric fan generally includes a positioning system 10, a head-shaking mechanism, a limiting device 20, and the like, wherein the limiting device 20 is disposed at a head-shaking boundary, and the head-shaking mechanism is caught by the limiting device 20 after reaching the boundary and cannot exceed a physical head-shaking range defined by the limiting device 20. As shown in fig. 2, the positioning system 10 includes a magnet 11, a hall sensor 12, and a controller 13. The magnet 11 is provided in the oscillating mechanism, and the hall sensor 12 is usually provided at an intermediate position. The magnet 11 is driven to move through rotation of the head shaking mechanism, when the magnet 11 passes through the Hall sensor 12, the Hall sensor 12 senses a magnetic signal, the controller 13 can determine that the head shaking mechanism is at the middle position, and then the controller 13 controls the stepping motor 30 to drive the head shaking mechanism to rotate, so that the head shaking mechanism can rotate leftwards or rightwards.
In the positioning system shown in fig. 2, 1) since the hall sensor 12 and the magnet 11 are provided, the circuit structure of the positioning system 10 is complicated, resulting in high cost; 2) If the oscillating mechanism rotates to the boundary position after being electrified, the oscillating mechanism can generate a locked-rotor phenomenon, and the locked-rotor duration time is longer, so that the energy efficiency utilization rate of the electric fan is low; the locked rotor can further increase the load of the gear, and if the locked rotor is locked for a long time, the problem that the oscillating mechanism gives out abnormal sound is easily caused.
Compared with the related art, firstly, the embodiment of the application drives the driving tube to be conducted through the voltage control signal output by the connecting end of the controller connected with the protection resistor, so as to control the N-phase stepping motor to rotate, and the controller judges whether the motor winding generates reverse voltage or not through detecting the voltage value output by the voltage dividing circuit, and determines whether the N-phase stepping motor is locked or not; secondly, the controller automatically judges whether the N-phase stepping motor is blocked by detecting the reverse voltage of the motor winding, and determines the corresponding angle of the N-phase stepping motor as a reset angle according to the judging result when the N-phase stepping motor is blocked, the whole process can be completed only in a short time, so that the rotating head mechanism can be quickly reset after rotating to the boundary position, the smooth rotation of the rotating head mechanism is realized, the blocking phenomenon of the rotating head mechanism is avoided, and the energy efficiency utilization rate of the electric fan is improved; and the problem of abnormal sound caused by locked rotor can be avoided.
The control circuit of an electric fan according to an embodiment of the present application, as shown in fig. 3, includes:
a controller 40 including M connection terminals;
an N-phase stepping motor M1; wherein M, N is an integer of 2 or more;
the main control circuit comprises N control modules 50, wherein each control module 50 comprises a driving tube Q, a protection resistor R and a voltage dividing circuit 501;
the collector of the driving tube Q and the voltage input end of the voltage dividing circuit 501 are commonly connected with the output end of a phase motor winding of the N-phase stepping motor M1, the emitter of the driving tube Q and the ground of the voltage dividing circuit 501 are grounded, the base of the driving tube Q is connected with one end of the protection resistor R, and the other end of the protection resistor R and the voltage output end of the voltage dividing circuit 501 are commonly connected with one connection end of the controller 40.
Here, the controller 40 is configured to control the N-phase stepping motor M1 to rotate; the N-phase stepping motor M1 is determined to be locked according to the voltage value output by the voltage dividing circuit 501. In addition, the controller 40 can also filter the voltage signal input through the connection terminal of the controller 40 through a built-in software algorithm, so as to simplify the circuit structure and reduce the cost. The controller 40 may be a Micro-controller Unit (MCU), a microprocessor (Microprocessor Unit, MPU), a digital signal processor (Digital Signal Processor, DSP), a field programmable gate array (Field Programmable Gate Array, FPGA), or the like, and in this embodiment, the controller 40 is described as an MCU. The connection end of the controller 40 connected with the protection resistor R outputs a voltage control signal to drive the driving tube Q to be turned on, so as to control the N-phase stepping motor M1 to rotate, the controller 40 determines whether the motor winding has reverse voltage or not by detecting the voltage value of the voltage output end of the voltage dividing circuit 501, and determines whether the N-phase stepping motor M1 is blocked or not, where the driving tube can be a silicon tube, a germanium tube, a MOS tube or the like, so that the conduction voltage drop is different, and the resistance ratio of the selected voltage dividing circuit is different. Because devices such as a Hall sensor and a magnet are not required to be arranged, the circuit structure is simplified, the implementation is easy, and the cost is low.
The N-phase stepper motor M1 is used for driving the oscillating mechanism of the electric fan to rotate, in this embodiment, the N-phase stepper motor M1 is a four-phase stepper motor, the N-phase stepper motor M1 is controlled by the controller 40, and after the controller 40 outputs a driving pulse, the N-phase stepper motor M1 rotates by an angle.
The main control circuit includes N control modules 50, in this embodiment, the main control circuit includes four control modules 50, however, the number of the control modules 50 is not limited thereto, and one skilled in the art may determine the number of the output terminals of the N-phase stepping motor M1 during implementation, which is not limited in the embodiment of the present application. Each control module 50 is connected with a corresponding motor winding, in this embodiment, the control module 50 includes a driving tube Q, a protection resistor R and a voltage dividing circuit 501, when the driving tube Q is turned on, the motor winding corresponding to the driving tube Q is powered on and rotates by an angle, and when the driving tube Q is turned off, the voltage of the voltage output end of the voltage dividing circuit 501 cannot pass through the driving tube Q, so that the reverse voltage collection of the motor winding cannot be affected.
When the N-phase stepping motor M1 is blocked, the beat is continuously output, the N-phase stepping motor M1 is inverted, a motor winding of the N-phase stepping motor M1 outputs a reverse voltage, the controller 40 automatically judges whether the N-phase stepping motor M1 is blocked or not by detecting the reverse voltage of the motor winding, and determines the angle corresponding to the N-phase stepping motor M1 when the N-phase stepping motor M1 is blocked as a reset angle according to a judging result, the whole process can be completed in a short time, and thus, after the oscillating mechanism rotates to the boundary position, the oscillating mechanism can be quickly reset, and smooth rotation of the oscillating mechanism is realized, so that the blocking phenomenon of the oscillating mechanism is avoided, and the energy efficiency utilization rate of the electric fan is improved; and the problem of abnormal sound caused by locked rotor can be avoided.
The embodiment of the application provides a control circuit of an electric fan, which comprises:
the controller comprises M connecting ends;
an N-phase stepper motor; wherein M, N is an integer of 2 or more;
the main control circuit comprises N control modules, wherein each control module comprises a driving tube, a protection resistor and a voltage dividing circuit;
the collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with the output end of a phase motor winding of the N-phase stepping motor, the emitter of the driving tube and the grounding end of the voltage dividing circuit are grounded, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller.
The voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected with the collector electrode of the driving tube, the other end of the first voltage dividing resistor and one end of the second voltage dividing resistor are connected with the other end of the protection resistor together, and the other end of the second voltage dividing resistor is grounded.
In some embodiments, the voltage dividing circuit further includes a capacitor, one end of the capacitor is connected to the other end of the first voltage dividing resistor, and the other end of the capacitor is grounded. The capacitor is used for filtering the voltage value output by the voltage dividing circuit, so that the output voltage value is smoother, and interference to the reverse voltage of the motor winding detected by the controller is avoided.
The embodiment of the application provides a control circuit of an electric fan, which comprises:
the controller comprises M connecting ends;
an N-phase stepper motor;
the main control circuit comprises N control modules, wherein each control module comprises a driving tube, a protection resistor, a voltage dividing circuit and a diode;
the collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with one output end of the stepping motor, the emitter of the driving tube and the grounding end of the voltage dividing circuit are grounded, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller.
The positive pole of the diode is connected with one end of the protection resistor, and the negative pole of the diode is connected with the collector electrode of the driving tube.
The voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected with the collector electrode of the driving tube, the other end of the first voltage dividing resistor and one end of the second voltage dividing resistor are connected with the other end of the protection resistor together, and the other end of the second voltage dividing resistor is grounded.
The diode in the embodiment of the application can reduce the voltage input through the protection resistor, so that the voltage input through the protection resistor is lower than the conduction voltage of the driving tube, and the influence on the reverse voltage of the motor winding detected by the controller is avoided.
In some embodiments, the voltage dividing circuit further includes a capacitor, one end of the capacitor is connected to the other end of the first voltage dividing resistor, and the other end of the capacitor is grounded. The capacitor is used for filtering the voltage value output by the voltage dividing circuit, so that the output voltage value is smoother, and interference to the reverse voltage of the motor winding detected by the controller is avoided.
The embodiment of the application provides a control circuit of an electric fan, as shown in fig. 4, a triode is selected as an example of a driving tube, the control circuit comprises a controller 40, an N-phase stepping motor M1 and a main control circuit, and the main control circuit comprises a first control module 51, a second control module 52, a third control module 53 and a fourth control module 54.
The first control module 51 includes a first resistor R1, a first diode D1, a first triode Q1, and a first voltage dividing circuit 521, where the first voltage dividing circuit 521 includes a second resistor R2, a third resistor R3, and a first capacitor C1, one end of the first resistor R1 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the base of the first triode Q1, the other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the third resistor R3, one end of the first capacitor C1, and a connection end a of the controller 40 respectively, a collector of the first triode Q1 and the other end of the second resistor R2 are connected to a first output end of the N-phase stepping motor M1, and an emitter of the first triode Q1 and the other end of the third resistor R3 and the other end of the first capacitor C1 are grounded together.
Here, the resistance of the first resistor R1 is 470 Ω, the second resistor R2 and the third resistor R3 play a role of voltage division, the resistance of the second resistor R2 is 100kΩ, the resistance of the third resistor R3 is 4.7kΩ, the model of the first diode D1 is 4148, the model of the first transistor Q1 is 8050, and the capacitance of the first capacitor C1 is 0.01uF.
In order to reduce the cost, under the condition that the first diode D1 is omitted, the value of the third resistor R3 is 2.7kΩ, and the voltage difference V1 between two ends of the third resistor R3 is calculated by the formula (1) provided in the embodiment;
V1＝R3/(R3+R2)*VCC＝2.7/(2.7+100)*24＝0.63V (1)；
v1 is smaller than PN junction voltage 0.7V of the first triode Q1, and the first triode Q1 is not conducted.
The second control module 52 includes a fourth resistor R4, a second diode D2, a second triode Q2, and a second voltage dividing circuit 522, where the second voltage dividing circuit 522 includes a fifth resistor R5, a sixth resistor R6, and a second capacitor C2, one end of the fourth resistor R4 is connected to the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected to the base of the second triode Q2, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, one end of the sixth resistor R6, one end of the second capacitor C2, and a connection end B of the controller 40 respectively, a collector of the second triode Q2 and the other end of the fifth resistor R5 are connected to a second output end of the N-phase stepping motor M1, and an emitter of the second triode Q2 and the other end of the sixth resistor R6, and the other end of the second capacitor C2 are grounded together.
Here, the resistance of the fourth resistor R4 is 470 Ω, the fifth resistor R5 and the sixth resistor R6 perform voltage division, the resistance of the fifth resistor R5 is 100kΩ, the resistance of the sixth resistor R6 is 4.7kΩ, the model of the second diode D2 is 4148, the model of the second transistor Q2 is 8050, and the capacitance of the second capacitor C2 is 0.01uF.
In order to reduce the cost, under the condition that the second diode D2 is omitted, the value of the sixth resistor R6 is 2.7kΩ, and the voltage difference V2 between two ends of the sixth resistor R6 is calculated by the formula (2) provided in the embodiment;
V2＝R6/(R6+R5)*VCC＝2.7/(2.7+100)*24＝0.63V (2)；
v2 is smaller than the PN junction voltage of the second triode Q2 by 0.7V, and the second triode Q2 is also not conducted.
The third control module 53 includes a seventh resistor R7, a third diode D3, a third triode Q3, and a third voltage dividing circuit 523, where the third voltage dividing circuit 523 includes an eighth resistor R8, a ninth resistor R9, and a third capacitor C3, one end of the seventh resistor R7 is connected to the positive electrode of the third diode D3, the negative electrode of the third diode D3 is connected to the base of the third triode Q3, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, one end of the ninth resistor R9, one end of the third capacitor C3, and a connection end C of the controller 40, a collector of the third triode Q3 and the other end of the eighth resistor R8 are connected to a third output end of the N-phase stepping motor M1, and an emitter of the third triode Q3 and the other end of the ninth resistor R9 and the other end of the third capacitor C3 are grounded together.
Here, the resistance value of the seventh resistor R7 is 470 Ω, the eighth resistor R8 and the ninth resistor R9 play a role of voltage division, the resistance value of the eighth resistor R8 is 100kΩ, the resistance value of the ninth resistor R9 is 4.7kΩ, the model of the third diode D3 is 4148, the model of the third transistor Q3 is 8050, and the capacitance of the third capacitor C3 is 0.01uF.
In order to reduce the cost, under the condition that the third diode D3 is omitted, the value of the ninth resistor R9 is 2.7kΩ, and the voltage difference V3 between two ends of the ninth resistor R9 is calculated by the formula (3) provided in the embodiment;
V3＝R9/(R9+R8)*VCC＝2.7/(2.7+100)*24＝0.63V (3)；
v3 is smaller than PN junction voltage 0.7V of the third triode Q3, and the third triode Q3 is also not conducted.
The fourth control module 54 includes a tenth resistor R10, a fourth diode D4, a fourth triode Q4, and a fourth voltage dividing circuit 524, where the fourth voltage dividing circuit 524 includes an eleventh resistor R11, a twelfth resistor R12, and a fourth capacitor C4, one end of the tenth resistor R10 is connected to the positive electrode of the fourth diode D4, the negative electrode of the fourth diode D4 is connected to the base of the fourth triode Q4, the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11, one end of the twelfth resistor R12, one end of the fourth capacitor C4, and the connection end D of the controller 40 respectively, the collector of the fourth triode Q4 and the other end of the eleventh resistor R11 are connected to the fourth output end of the N-phase stepping motor M1, and the emitter of the fourth triode Q4 and the other end of the twelfth resistor R12 and the other end of the fourth capacitor C4 are grounded together.
Here, the tenth resistor R10 has a resistance of 470 Ω, the eleventh resistor R11 and the twelfth resistor R12 have a voltage dividing function, the eleventh resistor R11 has a resistance of 100kΩ, the twelfth resistor R12 has a resistance of 4.7kΩ, the fourth diode D4 has a model of 4148, the fourth transistor Q4 has a model of 8050, and the fourth capacitor C4 has a capacitance of 0.01uF.
In order to reduce the cost, in the case of canceling the fourth diode D4, the twelfth resistor R12 takes a value of 2.7kΩ, and the voltage difference V4 between the two ends of the twelfth resistor R12 is calculated by the formula (4) provided in the embodiment;
V4＝R12/(R12+R11)*VCC＝2.7/(2.7+100)*24＝0.63V (4)；
v4 is smaller than the PN junction voltage of the fourth triode Q4 by 0.7V, and the fourth triode Q4 is also not conducted.
In practical application, the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 may be replaced by an integrated driving circuit UL2003 or the like, or may be replaced by a MOS transistor with the same characteristics.
The voltage division ratio of the second resistor R2 to the third resistor R3, the fifth resistor R5 to the sixth resistor R6, the eighth resistor R8 to the ninth resistor R9, and the eleventh resistor R11 to the twelfth resistor R12 can be equal to or smaller than that of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4, which are not conducted when the input state is controlled, can be properly controlled according to different resistance values selected by the stepping motor with different voltage values, and the transistor with the driving function can be selected from a silicon transistor, a germanium transistor, a MOS transistor, and the like.
The embodiment of the application provides a control method of an electric fan, as shown in fig. 5, the method comprises the following steps:
step S501, in a period taking continuous N beats, the controller sequentially controls different connection ends to output a voltage control signal in a corresponding beat, and controls the corresponding connection end to receive the voltage value output by the voltage dividing circuit in other (N-1) beats;
the electric fan comprises an N-phase stepping motor, a controller and a main control circuit, wherein the controller comprises M connecting ends; the main control circuit comprises N control modules, and each control module comprises a driving tube, a protection resistor and a voltage dividing circuit;
the collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with the output end of a one-phase motor winding of the N-phase stepping motor, the emitter of the driving tube is grounded with the grounding end of the voltage dividing circuit, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller;
in this embodiment, the N-phase stepper motor is a four-phase stepper motor, and correspondingly, the main control circuit has four connection terminals, and generally, the four-phase stepper motor has two operation modes, namely four-phase four-beat, namely a-B-C-D, and four-phase eight-beat, namely A-AB-B-BC-C-CD-D-DA; wherein A, B, C, D is a single-phase beat, AB, BC, CD, DA is a double-phase beat, four-phase and four-phase take four beats as a period, four-phase and eight beats as a period, four-phase and four beats are taken as examples in the embodiment, and a person skilled in the art can complete the situation when the four-phase stepping motor works with four-phase and eight beats according to actual needs.
When the stepping motor works in a four-phase four-beat mode, the A, B, C, D beats sequentially run, and the controller sequentially controls the four connecting ends to output a voltage control signal in a corresponding beat, in this embodiment, the voltage control signal is a high-level signal, and controls the corresponding connecting end to receive the voltage value output by the voltage dividing circuit in other three beats, namely, the connecting end outputting the voltage control signal in the A beat receives the corresponding voltage value output by the voltage dividing circuit in the B, C, D beats.
Step S502, the controller determines that the N-phase stepping motor is locked according to the voltage value output by the voltage dividing circuit;
when the N-phase stepping motor is blocked, the beat is continuously output, the N-phase stepping motor is inverted, the motor winding of the N-phase stepping motor outputs a reverse voltage, the reverse voltage is output after being divided by the voltage dividing circuit, the controller judges whether the motor winding generates the reverse voltage or not by detecting the voltage value output by the voltage dividing circuit, and whether the N-phase stepping motor is blocked or not is determined.
Step S503, the controller determines an angle corresponding to the N-phase stepping motor when locked rotation occurs as a reset angle;
After the controller determines that the N-phase stepping motor is locked, the current angle is set as a reset angle immediately, and likewise, if a user touches the head shaking mechanism or directly swings the head shaking mechanism to an angle value larger than the reset angle, the phenomenon of locked rotation can also occur, and the controller can also determine the angle corresponding to the N-phase stepping motor when the N-phase stepping motor is locked as the reset angle.
And step S504, the controller controls the N-phase stepping motor to rotate according to the reset angle.
After the current angle is set as a reset angle by the controller, the controller controls the N-phase stepping motor to drive the oscillating mechanism to rotate according to the reset angle, only a short time is required from the occurrence of the locked-rotor phenomenon to the restoration of normal rotation, and the oscillating mechanism in the related technology stays at the locked-rotor position for a long time.
The embodiment of the application provides a control method of an electric fan, as shown in fig. 6, the method comprises the following steps:
Step S601, the controller sequentially controls different connection ends to output a voltage control signal in a corresponding beat in a period taking continuous N beats as a period, and controls the corresponding connection ends to receive voltage values output by the voltage dividing circuit in other (N-1) beats;
here, the step S601 corresponds to the step S501, and the specific embodiment of the step S501 may be referred to when the step S is performed.
Step S602, a driving tube connected to a phase motor winding rotates corresponding to the motor winding connected to the collector of the conductive driving tube in response to the voltage control signal being conductive.
The base electrode of the driving tube is connected with the collector electrode of the driving tube through receiving the voltage control signal, the motor winding connected with the collector electrode of the driving tube is electrified, and the motor winding rotates by a certain angle.
Step S603, the controller determines that the N-phase stepping motor is locked according to the voltage value output by the voltage dividing circuit;
step S604, the controller determines an angle corresponding to the N-phase stepping motor when locked rotation occurs as a reset angle;
step S605, the controller controls the N-phase stepper motor to rotate according to the reset angle.
Here, the steps S603 to S605 correspond to the steps S502 to S504, and the specific embodiments of the steps S603 to S605 may be referred to when the steps are performed.
In some embodiments, the voltage divider circuit further comprises a capacitor, and correspondingly, the method further comprises:
the capacitor filters the voltage value output by the voltage dividing circuit;
and the controller determines that the N-phase stepping motor is locked according to the filtered voltage value.
The input voltage is input into the voltage dividing circuit after passing through the motor winding, and is output through the voltage output end of the voltage dividing circuit after being divided by the voltage dividing circuit, and the capacitor can filter the voltage value output by the voltage dividing circuit, so that the output voltage value is smoother, and the interference to the reverse voltage of the motor winding detected by the controller is avoided. After the interference signals are removed, the controller can accurately judge whether the N-phase stepping motor is blocked or not through the filtered voltage value, and the judgment accuracy is improved.
In some embodiments, the voltage divider circuit further comprises a capacitor, and correspondingly, each of the control modules further comprises a diode, the method further comprising:
the diode steps down a voltage signal input to the base of the driving tube.
The voltage signal input to the base electrode of the driving tube is reduced by using the diode, so that the voltage input through the protection resistor is lower than the conducting voltage of the driving tube, the influence on the reverse voltage of the motor winding detected by the controller is avoided, and the judgment accuracy is further improved.
The embodiment of the application provides a control method of an electric fan, as shown in fig. 7, the method includes:
step S701, in a period taking continuous N beats, the controller sequentially controls different connection ends to output a voltage control signal in a corresponding beat, and controls the corresponding connection end to receive the voltage value output by the voltage dividing circuit in other (N-1) beats;
here, the above-mentioned step S701 corresponds to the above-mentioned step S501, and the specific embodiment of the above-mentioned step S501 may be referred to in the implementation.
Step S702, obtaining a reference voltage value V0;
the reference voltage V0 can be calculated by the formula (5) provided in the present embodiment;
R200/(R200+R100)*VCC＝V0 (5)；
wherein VCC is an input voltage, R100 is a resistance value of the first voltage dividing resistor, R200 is a resistance value of the second voltage dividing resistor, and the reference voltage V0 may be predetermined and may be stored locally.
Step S703, determining that the N-phase stepping motor is locked when the magnitude relation between the voltage value and the acquired reference voltage value V0 satisfies a specific relation;
In some embodiments, the voltage values include a monophasic voltage value output when the N-phase stepper motor operates in monophasic beats and two biphasic voltage values output when the N-phase stepper motor operates in biphasic beats; correspondingly, the step S703 may include at least one of the following:
determining that the N-phase stepping motor is locked under the condition that the single-phase voltage value is smaller than a reference voltage value V0;
and determining that the N-phase stepping motor is locked under the condition that at least one bidirectional voltage value is smaller than a reference voltage value V0.
Step S704, determining an angle corresponding to the N-phase stepping motor when locked rotation occurs as a reset angle;
step S705, the controller controls the N-phase stepping motor to rotate according to the reset angle.
Here, the step S704 and the step S705 correspond to the step S503 and the step S504, respectively, and reference may be made to specific embodiments of the step S503 and the step S504 when they are implemented.
Based on the foregoing embodiment, the method for controlling an electric fan according to the embodiment of the present application is implemented based on a four-phase four-beat operation mode of a stepper motor, and uses a triode as a driving tube, as shown in fig. 8, and includes:
step S801, the controller outputs a voltage control signal at a first beat control connection end a, controls the connection end a to receive corresponding voltage values output by the voltage dividing circuit from a second beat to a fourth beat, and determines that the N-phase stepping motor is locked;
As shown in fig. 4 and 9, the first beat (0 to 4 ms): the connection terminal a of the controller 40 outputs a 5V high level signal, and the current sequentially passes through the first resistor R1 and the first diode D1 to turn on the first transistor Q1, and at this time, the a-phase motor winding of the N-phase stepper motor is energized and rotated by an angle. Receiving the voltage value output by the first voltage dividing circuit 521 at the connection end a of the controller 40 from the second beat to the fourth beat (5 to 16 ms), assuming that the input voltage VCC is 24V, inputting the voltage value into the first voltage dividing circuit 521 after passing through the a-phase motor winding, wherein the reference voltage value V0 is different due to different resistances of the voltage dividing resistors of the voltage dividing circuits, and the reference voltage value V0 corresponding to the first voltage dividing circuit 521 in this embodiment can be calculated by the formula (6) provided in this embodiment;
R3/(R3+R2)*VCC＝4.7/(4.7+100)*24＝1.07V (6)；
the voltage output end of the first capacitor C1 is output through the voltage output end of the first voltage dividing circuit 521 after filtering, the voltage output end is divided into two paths, one path of the voltage output end is directly input to the connecting end A of the controller 40 for internal ADC conversion, whether the phase A motor winding has reverse voltage or not is detected, the reference voltage value V0 is 1.07V, if the voltage is smaller than 1.07V, the phase A motor winding is blocked, and the oscillating mechanism reaches the boundary; the other path is input to the PN junction of the first triode Q1 after being reduced by 0.7V through the first resistor R1 and the first diode D1, and the feedback voltage can be conducted through the two PN junctions only when the feedback voltage is at least larger than 1.4V, so that the first triode Q1 is cut off, and the reverse-phase voltage detection of the controller 40 on the A-phase motor winding cannot be influenced.
Step S802, the controller outputs a voltage control signal at a second beat control connection end B, controls the connection end B to receive corresponding voltage values output by the voltage dividing circuit at a first beat, a third beat and a fourth beat, and determines that the N-phase stepping motor is locked;
second beat (5 to 8 ms): the connection terminal B of the controller 40 outputs a 5V high level signal, and the current sequentially passes through the fourth resistor R4 and the second diode D2 to turn on the second transistor Q2, and at this time, the B-phase motor winding of the N-phase stepper motor is energized and rotated by an angle. In the first beat (0 to 4 ms), the third beat (9 to 12 ms) and the fourth beat (13 to 16 ms), the connection end B of the controller 40 receives the voltage value output by the second voltage dividing circuit 522, and the input voltage VCC is assumed to be 24V, and the voltage value V0 is different due to the different resistance values of the voltage dividing resistors of the voltage dividing circuit, and the reference voltage value V0 can be calculated by the formula (7) provided in the embodiment;
R6/(R6+R5)*VCC＝4.7/(4.7+100)*24＝1.07V (7)；
the voltage output end of the second voltage dividing circuit 522 outputs the filtered voltage of the second capacitor C2, the voltage is divided into two paths, one path of the voltage is directly input to the connecting end B of the controller 40 for internal ADC conversion, whether the winding of the B-phase motor has reverse voltage or not is detected, the reference voltage value V0 is 1.07V, if the voltage is less than 1.07V, the winding of the B-phase motor is blocked, and the oscillating mechanism reaches the boundary; the other path of the feedback voltage is input to the PN junction of the second triode Q2 after being reduced by 0.7V through the fourth resistor R4 and the second diode D2, and the feedback voltage can be conducted through the two PN junctions only when the feedback voltage is at least larger than 1.4V, so that the second triode Q2 is cut off, and the reverse-phase voltage detection of the B-phase motor winding by the controller 40 cannot be influenced.
Step S803, the controller outputs a voltage control signal at the third beat control connection end C, controls the connection end C to receive the voltage values output by the voltage dividing circuit corresponding to the first beat, the second beat and the fourth beat, and determines that the N-phase stepping motor is locked;
third beat (9 to 12 ms): the connection terminal C of the controller 40 outputs a 5V high level signal, and the current sequentially passes through the seventh resistor R7 and the third diode D3 to turn on the third transistor Q3, and at this time, the C-phase motor winding of the N-phase stepper motor is energized and rotated by an angle. The connection terminal C of the controller 40 receives the voltage value output by the third voltage dividing circuit 523 in the first beat (0 to 4 ms), the second beat (5 to 8 ms) and the fourth beat (13 to 16 ms), and the input voltage VCC is assumed to be 24V, and the voltage value V0 is different due to the different resistances of the voltage dividing resistors of the voltage dividing circuit, and the reference voltage value V0 corresponding to the third voltage dividing circuit 523 in this embodiment can be calculated by the formula (8) provided in this embodiment;
R9/(R9+R8)*VCC＝4.7/(4.7+100)*24＝1.07V (8)；
the voltage output end of the third capacitor C3 is output through the third voltage dividing circuit 523 after filtering, and is divided into two paths, one path of the voltage is directly input to the connecting end C of the controller 40 for internal ADC conversion, whether the C-phase motor winding has reverse voltage or not is detected, the reference voltage value V0 is 1.07V, if the voltage is smaller than 1.07V, the C-phase motor winding is blocked, and the oscillating mechanism reaches the boundary; the other path of the feedback voltage is input to the PN junction of the third triode Q3 after being reduced by 0.7V through the seventh resistor R7 and the third diode D3, and the feedback voltage can be conducted through the two PN junctions only when the feedback voltage is at least larger than 1.4V of the third triode Q3, so that the third triode Q3 is cut off, and the reverse voltage detection of the C-phase motor winding by the controller 40 cannot be influenced.
Step S804, the controller outputs a voltage control signal at a fourth beat control connection end D, controls the connection end D to receive corresponding voltage values output by the voltage dividing circuit from a first beat to a third beat, and determines that the N-phase stepping motor is locked;
fourth beat (13 to 16 ms): the connection end D of the controller 40 outputs a 5V high-level signal, and the current sequentially passes through the tenth resistor R10 and the fourth diode D4 to enable the fourth triode Q4 to be conducted, and at the moment, the D-phase motor winding of the N-phase stepping motor is electrified and rotated for an angle. In the first beat (0 to 4 ms), the second beat (5 to 8 ms) and the third beat (9 to 12 ms), the connection end D of the controller 40 receives the voltage value output by the fourth voltage dividing circuit 524, and the input voltage VCC is assumed to be 24V, and the voltage value V0 is different due to the different resistance values of the voltage dividing resistors of the voltage dividing circuit, and the reference voltage value V0 corresponding to the fourth voltage dividing circuit 524 in this embodiment can be calculated by the formula (8) provided in this embodiment;
R9/(R9+R8)*VCC＝4.7/(4.7+100)*24＝1.07V (8)；
the voltage output end of the fourth capacitor C4 is output through the voltage output end of the fourth voltage dividing circuit 524 after filtering, the output end is divided into two paths, one path of the voltage is directly input to the connecting end D of the controller 40 for internal ADC conversion, whether the D-phase motor winding has reverse voltage or not is detected, the reference voltage value V0 is 1.07V, if the voltage is smaller than 1.07V, the D-phase motor winding is blocked, and the oscillating mechanism reaches the boundary; the other path of the feedback voltage is input to the PN junction of the fourth triode Q4 after being reduced by 0.7V through the tenth resistor R10 and the fourth diode D4, and the feedback voltage can be conducted through the two PN junctions only when the feedback voltage is at least larger than 1.4V of the fourth triode Q4, so that the fourth triode Q4 is cut off, and the reverse phase voltage detection of the D-phase motor winding by the controller 40 cannot be influenced.
Through the cyclic output from the first beat to the fourth beat, the operation of the motor can be continuously controlled, and whether the N-phase stepping motor is blocked or not can also be continuously detected.
In the related art, to realize the shaking of accurate angles of 30, 60, 90, 120 degrees and the like, the initial position (0 degree) needs to be reset firstly, in the resetting process, the shaking mechanism needs different resetting time at different positions, the worst position may need 15 seconds to stop rotating, the resetting time is long, and the user requirement cannot be met well. Meanwhile, a Hall sensor and a magnet form a reset system, so that the circuit is complex, the structure is complex, and the cost is high. From the above embodiments, it can be seen that the embodiment of the present application separates the motor's reverse voltage from the drive signal by a voltage divider circuit and drive tube. When the controller controls the connecting end to output a high-level signal, the driving triode is conducted, and the stepping motor starts to operate; when the controller controls the connection end to switch to an input state (namely, the connection end does not output a high-level signal any more at the moment), the controller monitors the reverse voltage output by the stepping motor through the voltage dividing circuit, namely, the reverse voltage is input through the voltage dividing circuit. Therefore, one connecting port of the controller can drive the stepping motor and collect reverse voltage, so that a control circuit of the electric fan is simplified, cost is reduced, the occurrence of locked rotation can be avoided, and the energy efficiency utilization rate is improved.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the present application.
Claims (9)
1. A control circuit of an electric fan, comprising:
the controller comprises M connecting ends;
an N-phase stepper motor; wherein M, N is an integer of 2 or more;
the main control circuit comprises N control modules, wherein each control module comprises a driving tube, a protection resistor and a voltage dividing circuit;
The collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with the output end of a one-phase motor winding of the N-phase stepping motor, the emitter of the driving tube is grounded with the grounding end of the voltage dividing circuit, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller;
the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected with a collector electrode of the driving tube, the other end of the first voltage dividing resistor and one end of the second voltage dividing resistor are connected with the other end of the protection resistor together, and the other end of the second voltage dividing resistor is grounded.
2. The control circuit of claim 1, wherein the voltage divider circuit further comprises a capacitor, one end of the capacitor is connected to the other end of the first voltage divider resistor, and the other end of the capacitor is grounded.
3. The control circuit according to any one of claims 1 to 2, wherein each of the control modules further comprises a diode, an anode of the diode being connected to one end of the protection resistor, and a cathode of the diode being connected to a collector of the driving tube.
4. The control method of the electric fan is characterized in that a control circuit of the electric fan comprises an N-phase stepping motor, a controller and a main control circuit, wherein the controller comprises M connecting ends; the main control circuit comprises N control modules, and each control module comprises a driving tube, a protection resistor and a voltage dividing circuit;
the collector of the driving tube and the voltage input end of the voltage dividing circuit are commonly connected with the output end of a one-phase motor winding of the N-phase stepping motor, the emitter of the driving tube is grounded with the grounding end of the voltage dividing circuit, the base of the driving tube is connected with one end of the protection resistor, and the other end of the protection resistor and the voltage output end of the voltage dividing circuit are commonly connected with one connecting end of the controller;
the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected with the collector electrode of the driving tube, the other end of the first voltage dividing resistor and one end of the second voltage dividing resistor are commonly connected with the other end of the protection resistor, and the other end of the second voltage dividing resistor is grounded;
the method comprises the following steps:
the controller sequentially controls different connecting ends to output a voltage control signal in a corresponding beat in a period taking continuous N beats as one period, and controls the corresponding connecting ends to receive the voltage value output by the voltage dividing circuit in other (N-1) beats;
The controller determines that the N-phase stepping motor is locked according to the voltage value output by the voltage dividing circuit;
the controller determines an angle corresponding to the N-phase stepping motor when locked rotation occurs as a reset angle;
and the controller controls the N-phase stepping motor to rotate according to the reset angle.
5. The method according to claim 4, wherein the method further comprises:
and the driving tube is connected with one-phase motor winding, and is connected with the collector electrode of the conductive driving tube to rotate corresponding to the motor winding under the condition that the voltage control signal is in conduction.
6. The method of claim 5, wherein the voltage divider circuit further comprises a capacitor, the method further comprising:
the capacitor filters the voltage value output by the voltage dividing circuit;
and the controller determines that the N-phase stepping motor is locked according to the filtered voltage value.
7. The method of claim 6, wherein each of the control modules further comprises a diode, the method further comprising:
the diode steps down a voltage signal input to the base of the driving tube.
8. The method of claim 4, wherein the controller determining the N-phase stepper motor stall from the voltage value output by the voltage divider circuit comprises
Acquiring a reference voltage value V0;
and under the condition that the magnitude relation between the voltage value and the acquired reference voltage value V0 meets a specific relation, determining that the N-phase stepping motor is locked.
9. The method of claim 8, wherein the voltage values include a monophasic voltage value output when the N-phase stepper motor is operated in monophasic beats and two biphasic voltage values output when operated in biphasic beats;
and under the condition that the magnitude relation between the voltage value and the acquired reference voltage value V0 meets a specific relation, determining that the N-phase stepping motor is locked, wherein the method comprises at least one of the following steps:
determining that the N-phase stepping motor is locked under the condition that the single-phase voltage value is smaller than a reference voltage value V0;
and determining that the N-phase stepping motor is locked under the condition that at least one of the two-phase voltage values is smaller than a reference voltage value V0.
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