Resistance detection circuit and clothes airing machine

Abstract

The embodiment of the utility model provides a resistance detection circuit and a clothes airing machine, and relates to the technical field of clothes airing machines. The resistance detection circuit is arranged in the clothes airing machine and comprises a motor current acquisition circuit and / or at least one Hall sensor. The input end of the motor current acquisition circuit is electrically connected with a motor of the clothes airing machine, the output end of the motor current acquisition circuit is connected with a main control chip of the clothes airing machine, and the motor current acquisition circuit is configured to output detection voltage of the motor to the main control chip when an airing rod of the clothes airing machine ascends; the detection voltage is used for detecting resistance of the airing rod; each Hall sensor is arranged on the motor and is configured to output a Hall signal to the main control chip; hall signals are used for detecting the resistance of the airing rod. According to the embodiment of the invention, the main control chip can determine whether the airing rod is blocked or not through the detection voltage and / or the Hall signal output by the resistance detection circuit, so that the motor is controlled to stop rotating, the airing rod is prevented from further rising and shrinking, and the safety of the clothes airing machine is improved.

Description

Technical Field

[0001] The present application relates to the technical field of clothes drying machines, and in particular to an obstruction detection circuit and a clothes drying machine. Background Art

[0002] At present, people's material consumption level is gradually improving, and many people use smart electric clothes drying machines to dry clothes at home. Among the common clothes drying machines on the market, the standard functions are the clothes drying pole lifting and drying clothes and the lighting to illuminate the balcony.

[0003] However, the clothes drying rod may sometimes encounter obstacles during its rising process. The existing clothes drying machine does not have an obstruction detection circuit to output a detection signal for detecting obstruction of the clothes drying rod, so that the main control chip cannot obtain the detection signal to determine whether the clothes drying rod encounters an obstruction, and thus cannot control the motor to stop rotating in time, resulting in structural damage to the clothes drying machine and bringing safety issues to the clothes drying machine. Utility Model Content

[0004] The embodiments of the present application provide an obstruction detection circuit and a clothes drying machine, which are used to solve the technical problem that the existing clothes drying machine has no obstruction detection circuit to output a detection signal for detecting obstruction of the clothes drying rod to the main control chip, thus bringing safety problems to the clothes drying machine.

[0005] In a first aspect, an embodiment of the present application provides an obstruction detection circuit, which is arranged in a clothes drying machine, and includes a motor current acquisition circuit and / or at least one Hall sensor;

[0006] The input end of the motor current acquisition circuit is electrically connected to the motor of the clothes drying machine, and the output end of the motor current acquisition circuit is connected to the main control chip of the clothes drying machine, and is configured to output the detection voltage of the motor to the main control chip when the clothes drying rod of the clothes drying machine rises; the detection voltage is used to detect whether the clothes drying rod encounters resistance;

[0007] Each Hall sensor is arranged on the motor and is configured to output a Hall signal to the main control chip; the Hall signal is used to detect whether the drying rod encounters obstruction.

[0008] In a possible implementation, the motor current acquisition circuit includes:

[0009] A filtering module, wherein the first end serves as an input end of a motor current acquisition circuit and is electrically connected to a first end of a sampling resistor in a motor drive circuit of the clothes drying machine, and the second end is electrically connected to a second end of the sampling resistor, and is configured to filter an initial voltage corresponding to the first end of the sampling resistor so that the frequency of the detection voltage is within a predetermined frequency range; the first end of the sampling resistor is electrically connected to the motor, and the second end of the sampling resistor is electrically connected to the first voltage end;

[0010] The voltage protection module has a first end electrically connected to the third end of the filter module, and a second end serving as an output end of the motor current acquisition circuit, and is configured to control the detection voltage to be within a preset voltage range.

[0011] In a possible implementation, the filtering module includes: a first inductor, a first capacitor, and a second capacitor;

[0012] The first end of the first inductor serves as the first end of the filter module, and the second end of the first inductor, the first end of the first capacitor and the first end of the second capacitor serve together as the third end of the filter module;

[0013] The second end of the first capacitor and the second end of the second capacitor together serve as the second end of the filter module.

[0014] In a possible implementation, the voltage protection module includes: a first resistor, a second resistor, a first diode, and a second diode;

[0015] The first end of the first resistor serves as the first end of the voltage protection module;

[0016] The second end of the first resistor, the anode of the first diode, the cathode of the second diode and the first end of the second resistor are all electrically connected;

[0017] The cathode of the first diode is electrically connected to the second voltage terminal, and the anode of the second diode is grounded;

[0018] The second end of the second resistor serves as the second end of the voltage protection module.

[0019] In a possible implementation, the resistance detection circuit further includes:

[0020] A signal acquisition circuit, the input end of which is electrically connected to each Hall sensor, the output end of which is electrically connected to the main control chip, and is configured to output the Hall signal output by the Hall sensor to the main control chip;

[0021] Among them, one waveform cycle of the Hall signal represents one rotation of the motor's rotating shaft.

[0022] In a possible implementation, the signal acquisition circuit includes: a signal interface and at least one protection resistor;

[0023] The signal interface includes a third voltage terminal, a fourth voltage terminal and at least one signal output terminal, the first terminal of each protection resistor is electrically connected to a corresponding signal output terminal, and the second terminal of each protection resistor is electrically connected to the fifth voltage terminal; the number of the signal output terminals is the same as the number of the Hall sensors;

[0024] The third voltage terminal, the fourth voltage terminal and a signal output terminal are electrically connected to a Hall sensor respectively, and each signal output terminal is used to be electrically connected to the main control chip.

[0025] In a second aspect, an embodiment of the present application provides a clothes drying machine, comprising: a main unit and a clothes drying rod, wherein the clothes drying rod is telescopically connected to the main unit, and the main unit comprises a motor, a main control chip and the resistance detection circuit of the first aspect.

[0026] In a possible implementation, the clothes drying machine has a main body with a bottom having an accommodation space for accommodating a clothes drying rod retracted into the main body.

[0027] In a possible implementation, the clothes drying machine further includes: a voice module communicatively connected to the main control chip;

[0028] The voice module is configured to send out corresponding voice prompt information according to the voice prompt instruction when receiving the voice prompt instruction sent by the main control chip; the voice prompt information is used to prompt that the clothes drying rod encounters an obstruction.

[0029] In one possible implementation, the host includes a motor driving circuit;

[0030] The motor driving circuit is electrically connected to the motor and is configured to drive the motor and control the rotation direction of the motor.

[0031] The beneficial effects of the technical solution provided by the embodiment of the present application are:

[0032] The resistance detection circuit of the embodiment of the present application is arranged in the clothes drying machine, and can detect the operating status of the motor of the clothes drying machine to obtain the detection voltage and / or the Hall signal characterizing the rotation of the motor, so that the main control chip can determine that the operation of the motor is abnormal according to the detection signal. When the resistance condition is met, the main control chip controls the motor to stop rotating, thereby avoiding structural damage or circuit failure of the clothes drying machine or fire of the main control board caused by further rising and contraction of the clothes drying rod, thereby greatly improving the safety of the clothes drying machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in describing the embodiments of the present application.

[0034] Figure 1 A schematic diagram of a framework of an obstacle detection circuit provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of a framework of electrical connection between a motor drive circuit and a motor current acquisition circuit provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of a circuit structure in which a motor drive circuit and a motor current acquisition circuit are electrically connected, provided in an embodiment of the present application;

[0037] Figure 4A schematic diagram of a current fluctuation waveform of a motor provided in an embodiment of the present application when a drying rod encounters an obstruction;

[0038] Figure 5 A schematic diagram of another frame of an obstacle detection circuit provided in an embodiment of the present application;

[0039] Figure 6 A schematic diagram of the structure of a signal acquisition circuit provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of an output waveform when a motor rotates provided in an embodiment of the present application;

[0041] Figure 8 A schematic diagram of a waveform output by a motor when a clothes drying rod encounters an obstruction provided in an embodiment of the present application;

[0042] Fig. 9 A schematic diagram of a framework in which the main control chip provided in an embodiment of the present application is electrically connected to an obstruction detection circuit and a voice module respectively.

[0043] Reference numerals:

[0044] 110-resistance detection circuit, 111-motor current acquisition circuit, 1111-filter module, 1112-voltage protection module, 112-Hall sensor, 113-signal acquisition circuit, 1131-signal interface;

[0045] 120-main control chip, 121-motor drive circuit, 1211-sampling resistor;

[0046] 130-Voice module. DETAILED DESCRIPTION

[0047] The embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the implementation methods described below in conjunction with the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0048] It will be understood by those skilled in the art that, unless specifically stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the terms "including" and "comprising" used in the embodiments of the present application refer to that the corresponding features can be implemented as the presented features, information, data, steps, operations, elements and / or components, but do not exclude the implementation as other features, information, data, steps, operations, elements, components and / or combinations thereof supported by the technical field. It should be understood that when we say that an element is "connected" or "coupled" to another element, the one element may be directly connected or coupled to the other element, or it may refer to that the one element and the other element establish a connection relationship through an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein indicates at least one of the items defined by the term, for example, "A and / or B" indicates that it is implemented as "A", or is implemented as "A", or is implemented as "A and B".

[0049] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0050] See also Figure 1 , which shows a schematic diagram of a framework of an obstacle detection circuit 110. The obstacle detection circuit 110 is arranged in a clothes drying machine, and the obstacle detection circuit 110 includes a motor current acquisition circuit 111 and / or at least one Hall sensor 112, Figure 1 A Hall sensor 112 is schematically taken as an example.

[0051] The input end of the current acquisition circuit 112 is electrically connected to the motor of the clothes drying machine, and the output end of the current acquisition circuit 112 is connected to the main control chip 120 of the clothes drying machine, and is configured to output the detection voltage of the motor to the main control chip 120 when the clothes drying rod of the clothes drying machine rises; the detection voltage is used to detect whether the clothes drying rod encounters resistance. Each Hall sensor 112 is arranged on the motor and is configured to output a Hall signal to the main control chip 120; the Hall signal is used to detect whether the clothes drying rod encounters resistance.

[0052] Optionally, the main control chip 120 determines whether the motor operation is abnormal according to the detection voltage and / or the Hall signal, and controls the motor to stop rotating when it is determined that the motor operation is abnormal. Large fluctuations in the detection voltage and / or the Hall signal may indicate that the motor operation is abnormal.

[0053] The resistance detection circuit 110 of the embodiment of the present application is arranged in the clothes drying machine, and can detect the operating state of the motor of the clothes drying machine to obtain the detection voltage and / or the Hall signal characterizing the rotation of the motor, so that the main control chip 120 can determine that the operation of the motor is abnormal according to the detection signal. When the resistance condition is met, the main control chip 120 controls the motor to stop rotating, thereby avoiding structural damage to the clothes drying machine or circuit failure or fire of the main control board caused by further rising and contracting of the clothes drying rod, thereby greatly improving the safety of the hidden clothes drying machine.

[0054] Optionally, the main control chip 120 can determine the motor current according to the detection voltage, and the main control chip 120 can determine the motor current through the detection voltage of the motor current acquisition circuit 111 through an existing calculation method. At the same time, the main control chip 120 can determine the motor rotation cycle time according to the Hall signal, and the determination of the motor rotation cycle time through the Hall signal output by the Hall sensor 112 can be achieved through an existing waveform processing method.

[0055] Furthermore, the main control chip 120 can control the motor to stop rotating when it is determined through a known computer program that the motor current exceeds a first predetermined threshold value and / or the motor rotation cycle time exceeds a second predetermined threshold value. The main control chip 120 also uses circuit devices such as comparators to implement comparison and output comparison results to control the motor to stop rotating.

[0056] As an example, the resistance detection circuit 110 can be applied to a hidden clothes drying machine. The resistance detection circuit 110 is configured to output a detection voltage and / or a Hall signal representing the rotation of the motor to the main control chip 120 when the clothes drying rod of the clothes drying machine moves into the main unit of the clothes drying machine.

[0057] When the clothes drying rod of the clothes drying machine moves into the main body of the clothes drying machine, the resistance detection circuit 110 of the embodiment of the present application can obtain the detection voltage of the motor of the clothes drying machine and / or the Hall signal representing the rotation of the motor, so that the main control chip 120 can obtain the motor current and / or the motor rotation cycle time according to the detection voltage and / or the Hall signal output by the resistance detection circuit 110, so that the motor can be controlled to stop rotating when it is determined that the resistance condition is met according to the motor current and / or the motor rotation cycle time.

[0058] The resistance detection circuit 110 of the embodiment of the present application can be applied to the field of intelligent fully hidden electric clothes drying machines. During the contraction process, the clothes drying rod will move upward until it is embedded in the main unit of the clothes drying machine. Because the overall appearance of the main unit needs to be maintained, the gap between the clothes drying rod and the main unit is small. If a clothes hanger is hung on the clothes drying rod, the width of the clothes hanger is greater than the gap of the main unit during the rise, which will cause resistance. In addition, if the clothes drying rod swings and deviates during the rise, it may collide with the main unit on the side, causing resistance.

[0059] See also Figure 2, which shows a schematic diagram of a framework of electrical connection between a motor drive circuit 121 and a motor current acquisition circuit 111. Figure 2 As shown, the motor driving circuit 121 includes a sampling resistor 1211. The motor driving circuit 121 is electrically connected to the motor, and the motor driving circuit 121 is configured to drive the motor and control the rotation direction of the motor.

[0060] The input end of the motor current acquisition circuit 111 is electrically connected to the first end of the sampling resistor 1211, and the output end of the motor current acquisition circuit 111 is electrically connected to the main control chip 120. The motor current acquisition circuit 111 is configured to output a detection voltage to the main control chip 120 so that the main control chip 120 samples the detection voltage to obtain a sampling voltage, and determines the motor current based on the sampling voltage and the sampling resistor.

[0061] The motor current acquisition circuit 111 of the embodiment of the present application can output a detection voltage, so that the main control chip 120 samples the detection voltage to obtain a sampling voltage, and converts it into a motor current, so that the motor current can be sampled in real time. When the motor current suddenly increases and exceeds the first predetermined threshold value corresponding to the motor current, it is determined that the drying rod encounters resistance, and the motor is controlled to stop rotating.

[0062] See also Figure 2 As shown, the motor current acquisition circuit 111 includes: a filtering module 1111 and a voltage protection module 1112 .

[0063] The first end of the filter module 1111 serves as the input end of the motor current acquisition circuit 111 and is electrically connected to the first end of the sampling resistor 1211 in the motor drive circuit 121 of the clothes drying machine, and the second end is electrically connected to the second end of the sampling resistor 1211. The filter module 1111 is configured to filter the initial voltage corresponding to the first end of the sampling resistor 1211 so that the frequency of the detection voltage is within a predetermined frequency range. The first end of the sampling resistor 1211 is electrically connected to the motor, and the second end of the sampling resistor is electrically connected to the first voltage end.

[0064] The first end of the voltage protection module 1112 is electrically connected to the third end of the filter module 1111 , and the second end of the voltage protection module 1112 serves as the output end of the motor current acquisition circuit 111 . The voltage protection module 1112 is configured to control the detection voltage to be within a preset voltage range.

[0065] Optionally, the first voltage terminal may be connected to a predetermined voltage or directly grounded, and the motor current acquisition circuit 111 may be a bus motor current acquisition circuit or a current sensor.

[0066] See also Figure 3 As shown, a schematic diagram of a circuit structure in which a motor drive circuit 121 is electrically connected to a motor current acquisition circuit 111 is shown. Figure 3 As shown, the filtering module 1111 includes a first inductor L4, a first capacitor EC12, and a second capacitor C22; the first end of the first inductor L4 serves as the first end of the filtering module 1111; the second end of the first inductor L4, the first end of the first capacitor EC12, and the first end of the second capacitor C22 serve together as the third end of the filtering module 1111; the second end of the first capacitor EC12 and the second end of the second capacitor C22 serve together as the second end of the filtering module 1111.

[0067] The voltage protection module 1112 includes a first resistor R48, a second resistor RJ8, a first diode D13, and a second diode D14. The first end of the first resistor R48 serves as the first end of the voltage protection module 1112; the second end of the first resistor R48, the anode of the first diode D13, the cathode of the second diode D14, and the first end of the second resistor RJ8 are all electrically connected. The cathode of the first diode D13 is electrically connected to the second voltage terminal VCC, and the anode of the second diode D14 is grounded. The second end of the second resistor RJ8 serves as the second end of the voltage protection module 1112.

[0068] Optionally, the inductance value of the first inductor L4 is 3.3μH (microhenry); the capacitance value of the first capacitor EC12 is 22μF, with a withstand voltage of 50V; the capacitance value of the second capacitor C22 is 104nF (nanofarad), the resistance value of the first resistor R48 is 4.7kΩ, and the first diode D13 and the second diode D14 are selected from 4148.

[0069] See also Figure 3 As shown, I_TEST is the connection point for the main control chip 120 to measure the motor current. The main control chip 120 collects the detection voltage here at a high speed of 100,000 times per second to obtain the sampled voltage; the motor current is connected to the ground after passing through the sampling resistor R49, and the sampling resistor R49 is 0.1Ω. According to Ohm's law U=IR formula, it can be obtained that the motor current I=I_TEST*10.

[0070] See also Figure 4 As shown in FIG. 1 , a schematic diagram of the current fluctuation waveform of the motor when the drying rod encounters resistance is shown. Figure 4 As shown in the figure, T1, T2 and T3 represent the stages of motor starting, motor resistance triggering, motor resistance stopping and falling back respectively. After the motor starts, the current rises and keeps stable. When encountering resistance, the motor current increases rapidly by 50%, triggering the resistance fault, and then falls back after the motor resistance stops.

[0071] Optionally, in each sampling period, the average motor current corresponding to the current motor current is determined based on a predetermined number of motor currents before the current motor current, and the average motor current is multiplied by a predetermined multiple to obtain a first predetermined threshold value as a threshold for encountering resistance judgment. The predetermined multiple can be 1.5 times. In practical applications, the first predetermined threshold value can also be a preset conventional motor current.

[0072] Optionally, the main control chip 120 calculates and records the motor current of each acquisition cycle, analyzes the fluctuation of the motor current, and when the motor current increases by 50% compared with the normal stable current, it is determined to be obstructed, thereby deriving the obstruction situation of the drying rod.

[0073] See also Figure 5 As shown in FIG. 1 , another schematic diagram of a resistance detection circuit 110 is shown. Figure 5 As shown, the resistance detection circuit 110 further includes: a signal acquisition circuit 113 .

[0074] The input end of the signal acquisition circuit 113 is electrically connected to each Hall sensor 112, and the output end of the signal acquisition circuit 113 is electrically connected to the main control chip 120. The signal acquisition circuit 113 is configured to output the Hall signal output by the Hall sensor 112 to the main control chip 120, wherein one waveform cycle of the Hall signal represents one rotation of the motor's rotating shaft.

[0075] Optionally, the main control chip 120 can sample the Hall signal output by any Hall sensor to obtain a timing parameter, and determine the motor rotation cycle time according to the timing parameter and a preset sampling frequency. The motor rotation cycle time is the time for the rotating shaft to rotate one circle.

[0076] Optionally, the Hall sensor 112 may be a Hall position sensor, and only one Hall sensor 112 may be provided, and only one Hall signal output by the Hall sensor 112 needs to be selected. Setting two Hall sensors 112 at the same time can be used in other functions of the clothes drying machine.

[0077] See also Figure 6 As shown, a schematic diagram of the structure of a signal acquisition circuit 113 is shown, and the signal acquisition circuit 113 includes: a signal interface 1131 and at least one protection resistor. The signal interface 1131 includes a third voltage terminal, a fourth voltage terminal and at least one signal output terminal, the first end of each protection resistor is electrically connected to a signal output terminal, and the second end of each protection resistor is electrically connected to the fifth voltage terminal. The number of signal output terminals is the same as the number of Hall sensors 112. The third voltage terminal, the fourth voltage terminal and a signal output terminal are electrically connected to a Hall sensor 112, and each signal output terminal is electrically connected to the main control chip 120.

[0078] See also Figure 6 As shown, CN10 represents a signal interface 1131, 1 and 2 correspond to two signal output terminals respectively, which can be connected to two Hall sensors 112, 3 and 4 correspond to the third voltage terminal and the fourth voltage terminal respectively, the third voltage terminal is connected to a 3.3v voltage, the fourth voltage terminal is grounded, the Hall sensor 112 is powered, and the fifth voltage terminal is connected to a 3.3v voltage. Correspondingly, the signal acquisition circuit 113 includes two protection resistors, namely resistor R14 and resistor R15, and the resistance values ​​of resistor R14 and resistor R15 can both be 10kΩ.

[0079] See also Figure 7 As shown in FIG. 1 , a schematic diagram of an output waveform when a motor rotates is shown. Figure 6 and Figure 7 As shown, CN10 is used as the motor Hall interface, HA_L and HA_H are the connection points for the main control chip 120 to detect the Hall signal of the Hall sensor 112. The Hall signal is installed at the rotating shaft of the motor. When the motor rotates one circle, the Hall signal outputs one cycle. The main control chip 120 receives the Hall output waveform and calculates the running speed of the motor. An optional calculation method is as follows: start the timer at the rising edge to start timing, end the timing at the next rising edge, record the timing parameters and start the next timing. According to the value of the timing parameter, combined with the preset sampling frequency of the timer, it is concluded that the motor rotation cycle time is T ms / r (milliseconds / revolution).

[0080] See also Figure 8 As shown in FIG. 1 , a schematic diagram of a waveform output by a motor when a drying rod encounters an obstacle is shown. Figure 8 As shown in the figure, the motor outputs a waveform when encountering resistance. When encountering resistance, the motor speed gradually slows down, and the motor rotation cycle time of the Hall signal of the motor becomes longer and longer.

[0081] Optionally, based on a predetermined number of motor rotation cycle times before the current motor rotation cycle time, an average motor rotation cycle time corresponding to the current motor rotation cycle time is determined, and the average motor rotation cycle time is multiplied by a predetermined multiple to obtain a second predetermined threshold value corresponding to the motor rotation cycle time as a threshold for encountering resistance judgment. The predetermined multiple may be 1.5 times. At the same time, the second predetermined threshold value may also be obtained by multiplying the average value of all motor rotation cycle times of the previous sampling period by a predetermined multiple. In practical applications, the second predetermined threshold value may also be a preset conventional motor rotation cycle time.

[0082] Optionally, the main control chip 120 can calculate and record the motor speed of each cycle, analyze the fluctuation of the motor speed, and when the motor rotation cycle time suddenly increases by 50% after being in a normal stable waveform motor, it is determined to be encountering resistance, thereby deriving the situation of resistance of the clothes drying rod.

[0083] The obstruction detection circuit 110 of the embodiment of the present application solves the problem that the clothes drying rod is easily colliding with the host and encountering obstruction. The motor current can be collected in real time through the motor drive circuit 121 and the motor current collection circuit 111 integrated in the main control board of the host. When the motor current suddenly increases, it is judged as encountering obstruction. At the same time, the obstruction detection circuit 110 of the embodiment of the present application collects the Hall signal of the Hall sensor 112 integrated on the motor through the signal collection circuit 113 set on the main control board to detect the rotation of the motor. When the motor speed suddenly slows down, the motor rotation cycle time suddenly increases, and it is judged as encountering obstruction, thereby avoiding the safety problems that may occur in the fully hidden host due to obstruction, and greatly improving the safety of the clothes drying machine.

[0084] At the same time, the resistance detection circuit 110 of the embodiment of the present application can also combine the two detection methods of the motor current acquisition circuit 111 and the Hall sensor 112. When the motor current suddenly increases and the motor rotation cycle time suddenly increases, it is judged as resistance. Therefore, the resistance detection circuit 110 of the embodiment of the present application can accurately judge the resistance, and then accurately control the motor to stop falling.

[0085] Based on the same inventive concept, an embodiment of the present application provides a clothes drying machine, including: a main unit and a clothes drying rod, the clothes drying rod is telescopically connected to the main unit, and the main unit includes a motor, a main control chip 120 and an resistance detection circuit 110 of an embodiment of the present application.

[0086] Optionally, the main control chip 120 , the motor driving circuit 121 , the motor current acquisition circuit 111 and the signal acquisition circuit 113 may all be integrated on a main control board.

[0087] In some embodiments, the bottom of the main unit has a storage space for accommodating a clothes drying rod retracted into the main unit.

[0088] The clothes dryer of the embodiment of the present application can be a fully hidden clothes dryer. The use of the resistance detection circuit 110 can solve the safety problem when the clothes drying rod of the fully hidden clothes dryer is retracted. In practical applications, high-precision current sensors and Hall position sensors can be used. When the main unit encounters slight obstacles when retracting, it can be detected and the unit will fall back when encountering obstacles, which greatly improves the safety of the hidden clothes dryer.

[0089] Optionally, the main control chip 120 is the control chip of the clothes drying machine, which can obtain the detection voltage and / or Hall signal of the resistance detection circuit 110, and obtain the motor current and / or the motor rotation cycle time according to the detection voltage and / or the Hall signal respectively, and then judge whether the clothes drying rod encounters resistance according to the motor current and / or the motor rotation cycle time, and then control the operation of the motor.

[0090] See also Fig. 9As shown, a schematic diagram of a framework in which the main control chip 120 is electrically connected to the resistance detection circuit 110 and the voice module 130 is shown. Fig. 9 As shown, the clothes drying machine further includes: a voice module 130 that is communicatively connected to the main control chip 120. The main control chip 120 is also configured to send a voice prompt instruction to the voice module 130 when it is determined that the motor current exceeds a first predetermined threshold and / or the motor rotation cycle time exceeds a second predetermined threshold. The voice module 130 is configured to send corresponding voice prompt information according to the voice prompt instruction; the voice prompt information is used to prompt that the clothes drying rod encounters an obstacle.

[0091] The clothes drying machine of the embodiment of the present application can give a voice prompt to the user after encountering an obstruction, so that the user can take down the clothes on the clothes drying rod and then hide them based on the voice prompt. The voice prompt information can be: encountering an obstruction fault, please take down the clothes on the clothes drying rod and then hide them.

[0092] In some embodiments, the host includes a motor driving circuit 121; the motor driving circuit 121 is electrically connected to the motor and is configured to drive the motor and control the rotation direction of the motor.

[0093] See also Figure 3 As shown, the motor drive circuit 121 includes a motor interface CN4, a first relay REL3, a second relay REL4, a third capacitor CX5, a third resistor R43, a third diode D15, a fourth capacitor EC4 and a sampling resistor 1211. In the motor drive circuit 121, the sampling resistor R49 is the sampling resistor 1211, CN4 is the interface of the motor, the first relay REL3 and the second relay REL4 are relays for controlling the forward and reverse rotation of the motor, M_DOWN_ON and M_UP_ON are signals for driving the relays, which are controlled by the main control chip 120; when M_DOWN_ON=0, M_UP_ON=12V, the clothes drying rod of the clothes drying machine drops; when M_DOWN_ON=12V, M_UP_ON=0V, the clothes drying rod of the clothes drying machine rises.

[0094] Optionally, the capacitance value of the third capacitor CX5 is 0.1μF (microfarad), with a withstand voltage of 275v (volt); the resistance value of the third resistor R43 is 47Ω (ohm); the first relay REL3 and the second relay REL4 are both connected to a 12v voltage, and JQC-3FF-12VDC is selected; the third diode D15 uses SB58, and the positive electrode is connected to a 32v voltage; the capacitance value of the fourth capacitor EC4 is 470μF, with a withstand voltage of 50v, and one end is grounded. R49 is a high-precision sampling resistor of 0.1Ω, with an accuracy of 1% and a power of 2w (watt). The current of the motor is finally grounded through the sampling resistor R49 and flows into GND.

[0095] In some embodiments, the main control chip 120 is also configured to control the motor to stop rotating, control the motor to rotate in a second direction, and control the motor to rotate for a predetermined time or the drying rod to descend to a predetermined position; the second direction is opposite to the first direction.

[0096] The clothes drying machine of the embodiment of the present application can automatically control the rotation direction of the motor to the second direction through the main control chip 120 when the clothes drying rod encounters an obstacle, and then control the motor to rotate for a predetermined time or the clothes drying rod to drop to a predetermined position, so that the clothes drying rod automatically falls back after encountering an obstacle.

[0097] Optionally, after the control motor stops rotating, the main control chip 120 can also send an alarm instruction to the alarm device, so that the alarm device sends an alarm message, and the user can operate the remote control or voice control the clothes drying rod to a predetermined position. Alternatively, after the control motor stops rotating, the user can operate the remote control or voice control the clothes drying rod to a predetermined position when he needs to use the clothes drying machine.

[0098] In some embodiments, the main control chip 120 is also configured to sample the detection voltage to obtain a sampling voltage, and determine the motor current based on the sampling voltage and the sampling resistance of the resistance detection circuit 110; and / or, sample the Hall signal output by any Hall sensor 112 of the resistance detection circuit 110 to obtain timing parameters; determine the motor rotation cycle time based on the timing parameters and the preset sampling frequency.

[0099] Based on the same inventive concept, the control method for the drying rod encountering an obstruction provided in the embodiment of the present application is applied to the clothes drying machine in the embodiment of the present application, and the control method for the drying rod encountering an obstruction includes:

[0100] Step 1: Obtain a drying rod retraction instruction, and control the rotation direction of the motor to a first direction according to the drying rod retraction instruction, so that the drying rod moves into the main unit of the clothes drying machine.

[0101] Optionally, the control method for the drying rod encountering an obstacle in the embodiment of the present application is a control step of the main control chip 120, and the user sends a drying rod retraction instruction to the main control chip 120 by voice or by operating a remote control. After the main control chip 120 obtains the drying rod retraction instruction, it drives the drying rod to retract into the accommodation space in the host so as to be hidden in the host.

[0102] Step 2: Obtain the detection voltage output by the resistance detection circuit 110 and / or the Hall signal representing the rotation of the motor, determine the motor current according to the detection voltage and / or determine the motor rotation cycle time according to the Hall signal.

[0103] Optionally, the resistance detection circuit 110 obtains the detection voltage output by the motor current acquisition circuit 111 and / or the Hall signal of the motor rotation, so that the main control chip 120 can obtain two kinds of detection data of the motor current and the motor rotation cycle time according to the detection voltage and the Hall signal, and analyze the detection data to determine whether there is resistance.

[0104] Step three: when it is determined that the motor current exceeds the first predetermined threshold value and / or the motor rotation cycle time exceeds the second predetermined threshold value, control the motor to stop rotating.

[0105] The control method for the drying rod encountering resistance in the embodiment of the present application can combine the motor current and the motor rotation cycle time to determine whether resistance has occurred, or can determine whether resistance has occurred separately.

[0106] In some embodiments, after determining that the motor current exceeds a first predetermined threshold and / or the motor rotation cycle time exceeds a second predetermined threshold, controlling the motor to stop rotating includes at least one of the following:

[0107] Control the motor to rotate in a second direction, and control the motor to rotate for a predetermined time or the drying rod to descend to a predetermined position; the second direction is opposite to the first direction;

[0108] A corresponding voice prompt instruction is sent to the voice module 130, so that the voice module 130 sends corresponding voice prompt information according to the voice prompt instruction.

[0109] The control method for the clothes-drying rod encountering an obstacle in the embodiment of the present application can control the motor to stop rotating, and then control the motor to drive the clothes-drying rod to descend, so that it can fall back when encountering an obstacle. At the same time, voice reminders can be provided to the user, so that the user can take down the clothes on the clothes-drying rod based on the voice prompt and then hide them.

[0110] The embodiment of the present application also provides a second control method for the clothes drying rod encountering an obstacle, comprising the following process:

[0111] The system is powered on and enters standby operation. The user opens the drying rod hiding mode through voice or remote control. When the user controls the drying rod to enter the hiding mode, the resistance detection circuit 110 outputs two kinds of data related to the motor operation to the main control chip 120, namely the detection voltage output by the motor current acquisition circuit 111 and the Hall signal output by the Hall sensor 112. The main control chip 120 simultaneously starts to collect current 100,000 times per second to detect the motor current, and detects the motor rotation cycle time of the Hall signal of the Hall sensor 112 to collect and form the corresponding two kinds of detection data. The main control chip 120 analyzes the detection data. When the motor current increases by 50% compared with the normal stable current and the motor rotation cycle time suddenly increases by 50%, the system determines that it encounters resistance and triggers the drying rod to fall back due to resistance. The user is reminded by voice, "Voice reminder: resistance failure, please take off the clothes on the drying rod before hiding". If the resistance failure is not triggered throughout the process, it is considered normal and the drying rod will be hidden normally.

[0112] It should be understood that, although each operation step is indicated by arrows in the flowchart of the embodiment of the present application, the implementation order of these steps is not limited to the order indicated by the arrows. Unless clearly stated herein, in some implementation scenarios of the embodiment of the present application, the implementation steps in each flowchart can be performed in other orders according to demand. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on actual implementation scenarios. Some or all of these sub-steps or stages may be executed at the same time, and each sub-step or stage in these sub-steps or stages may also be executed at different times respectively. In different scenarios of execution time, the execution order of these sub-steps or stages may be flexibly configured according to demand, and the embodiment of the present application does not limit this.

[0113] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories), or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0114] The above is only an optional implementation method for some implementation scenarios of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical concept of the solution of the present application, other similar implementation methods based on the technical ideas of the present application are also within the protection scope of the embodiments of the present application.

Claims

1. An obstacle detection circuit, characterized in that: The resistance detection circuit is arranged in the clothes drying machine, and the resistance detection circuit comprises a motor current acquisition circuit and / or at least one Hall sensor; The input end of the motor current acquisition circuit is electrically connected to the motor of the clothes drying machine, and the output end of the motor current acquisition circuit is connected to the main control chip of the clothes drying machine, and is configured to output the detection voltage of the motor to the main control chip when the clothes drying rod of the clothes drying machine rises; the detection voltage is used to detect whether the clothes drying rod encounters resistance; Each of the Hall sensors is disposed on the motor and is configured to output a Hall signal to the main control chip; the Hall signal is used to detect whether the drying rod encounters an obstruction.

2. The resistance detection circuit according to claim 1, characterized in that: The motor current acquisition circuit comprises: A filtering module, wherein the first end serves as an input end of a motor current acquisition circuit and is electrically connected to a first end of a sampling resistor in a motor drive circuit of the clothes drying machine, and the second end is electrically connected to a second end of the sampling resistor, and is configured to filter an initial voltage corresponding to the first end of the sampling resistor so that the frequency of the detection voltage is within a predetermined frequency range; the first end of the sampling resistor is electrically connected to the motor, and the second end of the sampling resistor is electrically connected to the first voltage end; The voltage protection module has a first end electrically connected to the third end of the filter module and a second end serving as an output end of the motor current acquisition circuit and is configured to control the detection voltage to be within a preset voltage range.

3. The resistance detection circuit according to claim 2, characterized in that: The filtering module includes: a first inductor, a first capacitor and a second capacitor; The first end of the first inductor serves as the first end of the filter module, and the second end of the first inductor, the first end of the first capacitor and the first end of the second capacitor serve together as the third end of the filter module; The second end of the first capacitor and the second end of the second capacitor together serve as the second end of the filtering module.

4. The resistance detection circuit according to claim 2, characterized in that: The voltage protection module includes: a first resistor, a second resistor, a first diode and a second diode; The first end of the first resistor serves as the first end of the voltage protection module; The second end of the first resistor, the anode of the first diode, the cathode of the second diode and the first end of the second resistor are all electrically connected; The cathode of the first diode is electrically connected to the second voltage terminal, and the anode of the second diode is grounded; The second end of the second resistor serves as the second end of the voltage protection module.

5. The resistance detection circuit according to claim 1, characterized in that: The resistance detection circuit also includes: A signal acquisition circuit, the input end of which is electrically connected to each of the Hall sensors, the output end of which is electrically connected to the main control chip, and is configured to output the Hall signal output by the Hall sensor to the main control chip; Among them, one waveform cycle of the Hall signal represents one rotation of the rotating shaft of the motor.

6. The resistance detection circuit according to claim 5, characterized in that: The signal acquisition circuit includes: a signal interface and at least one protection resistor; The signal interface comprises a third voltage terminal, a fourth voltage terminal and at least one signal output terminal, the first terminal of each protection resistor is electrically connected to one of the signal output terminals, and the second terminal of each protection resistor is electrically connected to the fifth voltage terminal; the number of the signal output terminals is the same as the number of the Hall sensors; The third voltage terminal, the fourth voltage terminal and a signal output terminal are electrically connected to a corresponding Hall sensor, and each of the signal output terminals is electrically connected to the main control chip.

7. A clothes drying machine, characterized in that: include: A host and a drying rod, wherein the drying rod is telescopically connected to the host, and the host comprises a motor, a main control chip and an resistance detection circuit as described in any one of claims 1-6.

8. The clothes drying machine according to claim 7, characterized in that: The bottom of the main unit is provided with a receiving space for receiving the drying rod retracted into the main unit.

9. The clothes drying machine according to claim 7, characterized in that: Also includes: A voice module connected to the main control chip for communication; The voice module is configured to issue corresponding voice prompt information according to the voice prompt instruction when receiving the voice prompt instruction issued by the main control chip; the voice prompt information is used to prompt that the drying rod encounters an obstruction.

10. The clothes drying machine according to claim 7, characterized in that: The host comprises a motor drive circuit; The motor driving circuit is electrically connected to the motor, and is configured to drive the motor and control the rotation direction of the motor.

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