Fault detection circuit, equipment control circuit and clothes airing machine

Abstract

The utility model relates to the technical field of electronic circuits, in particular to a fault detection circuit, a control circuit of equipment and a clothes airing machine. The fault detection circuit comprises at least one of the following components: a first detection module which is respectively connected with the motor control circuit and the motor and determines whether the motor control circuit and / or the motor are / is abnormal by detecting a control signal of the circuit and voltage and current information of the motor; the second detection module is respectively connected with a first functional module adopting direct-current voltage and a first control circuit of the module, and is used for determining whether the first functional module and / or the first control circuit are / is abnormal or not by detecting a control signal of the circuit and voltage and current information of the first functional module; and the third detection module is connected with a second functional module adopting the alternating current voltage, and determines whether the second functional module and / or a circuit sending out the control signal are / is abnormal or not by detecting the control signal and the zero-crossing signal of the module. According to the invention, the fault detection can accurately locate the position where the abnormity exists.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits and smart home devices, and in particular to a fault detection circuit, a control circuit of a device, and a clothes drying machine. Background Art

[0002] In order to extend the service life of the equipment and improve the user experience, most of the existing equipment is equipped with a fault detection function to promptly detect any abnormalities in the equipment and better maintain the equipment.

[0003] However, although the existing fault detection can detect the presence of abnormalities in the equipment, it is impossible to clearly identify the location of the abnormality, which makes it difficult for maintenance personnel to maintain the equipment and the maintenance cost is high. Utility Model Content

[0004] The purpose of the present application is to provide a fault detection circuit, a control circuit of a device and a clothes drying machine to solve at least one of the above technical problems. The solutions provided in the embodiments of the present application are as follows:

[0005] In a first aspect, the present application provides a fault detection circuit, comprising at least one of the following:

[0006] A first detection module is connected to the motor control circuit and the motor respectively, and determines whether the motor control circuit and / or the motor has an abnormality by detecting a control signal sent by the motor control circuit and voltage and current information of the motor;

[0007] A second detection module is connected to the first functional module using a DC voltage and the first control circuit of the first functional module, respectively, and determines whether the first functional module and / or the first control circuit has an abnormality by detecting a control signal sent by the first control circuit and voltage and current information of the first functional module;

[0008] The third detection module is connected to the second functional module using AC voltage, and determines whether there is an abnormality in the second functional module and / or the second control circuit that sends the control signal by detecting the control signal and the zero-crossing signal received by the second functional module.

[0009] In a feasible embodiment, the first detection module, the second detection module and / or the third detection module are also respectively connected to the central control module to receive work instructions issued by the central control module and to feedback detection information to the central control module; the motor control circuit, the first control circuit and the second control circuit are connected to the central control module.

[0010] In a feasible embodiment, the first detection module includes a motor interface unit, a first current detection unit and a first voltage detection unit;

[0011] The motor interface unit is connected to the motor control circuit, the motor, the first current detection unit and the first voltage detection unit respectively;

[0012] One end of the first current detection unit is connected to the motor interface unit, and the other end is connected to the central control module;

[0013] One end of the first voltage detection unit is connected to the motor interface unit, and the other end is connected to the central control module.

[0014] In a feasible embodiment, the first current detection unit includes a current sampling resistor R2, a magnetic bead L1, a capacitor C1 and clamping diodes D2 and D3; the first end of the current sampling resistor R2 is connected to the first end of the magnetic bead L1 and to the motor interface unit, and the second end is connected to the first end of the capacitor C1, the positive electrode of the clamping diode D3 and grounded; the second end of the magnetic bead L1 is connected to the second end of the capacitor C1, the positive electrode of the clamping diode D2, the negative electrode of the clamping diode D3 and the central control module; the negative electrode of the clamping diode D2 is connected to the power supply voltage;

[0015] Among them, the first voltage detection unit includes diodes D4 and D5, resistors R5, R6, R7, R8 and capacitor C3; the positive electrodes of the diodes D4 and D5 are respectively connected to the motor voltage output end of the motor interface unit, and the negative electrodes are respectively connected to the first end of the resistor R5; the first end of the resistor R6 is connected to the second end of the resistor R5, and the second end is connected to the first end of the resistor R8, the first end of the capacitor C3 and the first end of the resistor R7; the second end of the resistor R8 and the second end of the capacitor C3 are grounded, and the second end of the resistor R7 is connected to the central control module.

[0016] In a feasible embodiment, the second detection module includes a first interface unit, a second current detection unit and a second voltage detection unit;

[0017] The first interface unit is connected to the first functional module, the first control circuit, the second current detection unit and the second voltage detection unit respectively;

[0018] One end of the second current detection unit is connected to the first interface unit, and the other end is connected to the central control module;

[0019] One end of the second voltage detection unit is connected to the first interface unit, and the other end is connected to the central control module.

[0020] In a feasible embodiment, the second current detection unit includes a current sampling resistor R15, a magnetic bead L2, a capacitor C6 and clamping diodes D6 and D7; the first end of the current sampling resistor R15 is connected to the first end of the magnetic bead L2 and connected to the first interface unit, and the second end is connected to the first end of the capacitor C6 and the positive electrode of the clamping diode D7 and is grounded; the second end of the magnetic bead L2 is connected to the positive electrode of the clamping diode D6, the negative electrode of the clamping diode D7 and the second end of the capacitor C6 and connected to the central control module; the negative electrode of the clamping diode D6 is connected to the power supply voltage;

[0021] Among them, the second voltage detection unit includes resistors R10, R11, R12, R14 and capacitor C5; the first end of the resistor R10 is connected to the first interface unit, and the second end is connected to the resistor R11; the second end of the resistor R11 is connected to the first end of the resistor R12 and the first end of the resistor R14; the second end of the resistor R12 is connected to the first end of the capacitor C5 and is grounded; the second end of the resistor R14 is connected to the second end of the capacitor C5 and is connected to the central control module.

[0022] In a feasible embodiment, the third detection module includes a second interface unit and a zero-crossing detection unit;

[0023] The zero-crossing detection unit includes a diode and a resistor for voltage division arranged at the front end, a resistor, a triode and a capacitor for filtering arranged at the back end, and a photoelectric coupler connecting the front end and the back end;

[0024] One end of the second interface unit is connected to the second functional module, and the other end is connected to the front end of the zero-crossing detection unit; the rear end of the zero-crossing detection unit is connected to the central control module.

[0025] In a second aspect, the present application provides a control circuit of a device, including: a drive control circuit for driving a motor and / or a functional module configured by the device, and a fault detection circuit provided by the first aspect and any one of the aspects;

[0026] Among them, the drive control circuit is connected to the central control module, including at least one of a motor control circuit, a first control circuit and a second control circuit; the fault detection circuit is connected to the motor and / or functional module configured by the device.

[0027] In a feasible embodiment, the fault detection circuit is also connected to the central control module to receive a working instruction issued by the central control module and transmit detection information to the central control module.

[0028] In a feasible embodiment, the central control module includes an MCU chip that integrates a wireless communication sub-module, which is used to transmit the detection result information to different external devices through different wireless communication methods; the wireless communication sub-module is configured with at least two of a network communication unit, a Bluetooth communication unit and an infrared communication unit.

[0029] In a third aspect, the present application provides a clothes drying machine, the operation of which is controlled by the control circuit of the device provided in the second aspect and any one of the items thereof; the clothes drying machine comprises: a main unit, a clothes drying rod connected to the main unit and a functional module; the central control module is arranged inside the main unit; and the motor is used to drive the clothes drying rod to work.

[0030] In a feasible embodiment, the functional modules of the clothes drying machine include the first functional module and / or the second functional module; the first functional module includes a lighting module and / or a disinfection module; the second functional module includes a drying module and / or an air-drying module.

[0031] Compared with the prior art, the solution of this application has the following advantages:

[0032] In the first aspect, the present application provides a fault detection circuit, specifically, adapted to the detection of the direction of the motor, a first detection module connected to the motor control circuit and the motor can be arranged, and the motor control circuit and / or the motor are determined to be abnormal by detecting the control signal sent by the motor control circuit and the voltage and current information of the motor; adapted to the detection of the direction of the first functional module using DC voltage, a first detection module connected to the first functional module and the first control circuit of the first functional module can be arranged, and the control signal sent by the first control circuit and the voltage and current information of the first functional module can be detected to determine whether the first functional module and / or the first control circuit are abnormal; adapted to the detection of the direction of the second functional module using AC voltage, a third detection module connected to the second functional module can be arranged, and the control signal and the zero-crossing signal received by the second functional module can be detected to determine whether the second functional module and / or the second control circuit that sends the control signal are abnormal. The implementation of the present application can accurately locate the location of the abnormality, such as clarifying whether it is a problem with the functional module or the control circuit (circuit board circuit), which is conducive to the maintenance personnel to maintain the equipment, reduce maintenance costs, and improve user experience.

[0033] In the second aspect, the present application provides a control circuit of a device, specifically, the control circuit includes a central control module, a drive control circuit for driving a motor and / or a functional module configured for the device, and the fault detection circuit described in the first aspect and any one thereof; wherein the drive control circuit is connected to the central control module and may include at least one of a motor control circuit, a first control circuit, and a second control circuit; the fault detection circuit is connected to the motor and / or the functional module configured for the device. The implementation of the present application introduces a fault detection circuit into the control circuit of the device to effectively improve the efficiency of fault detection of the device, reduce the maintenance cost of the device, and improve the user experience.

[0034] In the third aspect, the present application provides a clothes drying machine. Specifically, the operation of the clothes drying machine is controlled by the control circuit of the device provided in the second aspect and any one of the aspects; wherein the clothes drying machine includes a host, a clothes drying rod connected to the host, and a functional module, and the central control module in the control circuit can be arranged inside the host, and the clothes drying rod is driven to work by a motor. The implementation of the present application controls the operation of the clothes drying machine through the control circuit of the device equipped with a fault detection circuit, which can effectively improve the fault detection efficiency of the clothes drying machine, accurately locate the abnormal position in the clothes drying machine (such as clarifying whether there is an abnormality in the control circuit or the functional module), better maintain the clothes drying machine, and reduce the maintenance cost of the clothes drying machine.

[0035] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0037] Figure 1 A module diagram of a fault detection circuit provided by one embodiment of the present application;

[0038] Figure 2 A circuit diagram of a motor interface unit and a first current detection unit in a first detection module provided in one embodiment of the present application;

[0039] Figure 3 A circuit diagram of a first voltage detection unit in a first detection module provided in one embodiment of the present application;

[0040] Figure 4 A schematic diagram of a fault detection adapted to the direction of a motor provided by an embodiment of the present application;

[0041] Figure 5 A circuit diagram of a second detection module provided in one embodiment of the present application;

[0042] Figure 6 A schematic diagram of fault detection adapted to a first functional module provided in one embodiment of the present application;

[0043] Figure 7 A circuit diagram of a third detection module provided in one embodiment of the present application;

[0044] Figure 8 A schematic diagram of fault detection adapted to a second functional module provided in one embodiment of the present application;

[0045] Fig. 9 A schematic diagram of a control circuit of a device provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0046] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0047] The fault detection circuit provided in the present application is described below in conjunction with the accompanying drawings.

[0048] Specifically, Figure 1 As shown, the fault detection circuit provided in the embodiment of the present application may include at least one of a first detection module, a second detection module and a third detection module.

[0049] Among them, the first detection module is suitable for fault detection in the motor direction, which can be connected to the motor control circuit and the motor respectively. During fault detection, it can determine whether there is an abnormality in the motor control circuit and / or the motor by detecting the control signal sent by the motor control circuit and the voltage and current information of the motor.

[0050] Among them, the second detection module is suitable for fault detection of the first functional module using DC voltage, and it can be connected to the first functional module and the first control circuit that controls the first functional module respectively. In fault detection, it can be determined whether there is an abnormality in the first functional module and / or the first control circuit by detecting the control signal emitted by the first control circuit and the voltage and current information of the first functional module.

[0051] Among them, the third detection module is suitable for fault detection of the second functional module using AC voltage, and it can be connected to the second functional module. In fault detection, it can be determined whether the second functional module and / or the second control circuit that sends the control signal is abnormal by detecting the control signal and the zero-crossing signal received by the second functional module. Optionally, the second control circuit and the third detection module can be connected so that the third detection module directly obtains the control signal sent by the second control circuit.

[0052] In a feasible embodiment, considering that the control circuit that sends the control signal is generally connected to the central control module of the equipment, in order to better and timely feedback the fault detection result, each detection module arranged in the fault detection circuit can also be connected to the central control module respectively to receive the working instructions sent by the central control module and timely feedback the fault detection result to the central control module. Figure 1 and Fig. 9 As shown, in the peripheral circuit of the fault detection circuit, the central control module is connected to each control circuit as well as each detection module arranged in the fault detection circuit.

[0053] The fault detection circuit provided in the embodiment of the present application can be considered based on the operation of the device. For example, if the device may need to deploy a motor to control the operation of certain components, the fault detection for the motor direction is optimized to specifically locate whether the circuit used to control the motor has an abnormality or the motor itself has an abnormality. Similarly, the present application also optimizes the circuit for fault detection for functional modules that apply DC voltage and functional modules that apply AC voltage to accurately locate the location of the abnormality, reduce maintenance costs, and improve user experience.

[0054] The specific circuit structure and working principle of the first detection module in the embodiment of the present application are described below.

[0055] like Figure 2 and Figure 3 As shown, the first detection module includes a motor interface unit, a first current detection unit (also called a motor current detection unit) and a first voltage detection unit (also called a motor voltage detection unit).

[0056] The first detection module is connected to the motor control circuit and the motor respectively through the motor interface unit. The first current detection unit and the first voltage detection unit are independent of each other; one end of the first current detection unit is connected to the motor interface unit, and the other end is connected to the central control module; one end of the first voltage detection unit is connected to the motor interface unit, and the other end is connected to the central control module.

[0057] Optionally, the circuit structure of the motor interface unit can be specifically seen Figure 2 Schematic diagram shown.

[0058] Alternatively, if Figure 2As shown, the first current detection unit includes a current sampling resistor R2, a magnetic bead L1, a capacitor C1, and clamping diodes D2 and D3. The first end of the current sampling resistor R2 is connected to the first end of the magnetic bead L1 and to the motor interface unit, and the second end is connected to the first end of the capacitor C1, the positive electrode of the clamping diode D3 and grounded; the second end of the magnetic bead L1 is connected to the second end of the capacitor C1, the positive electrode of the clamping diode D2, the negative electrode of the clamping diode D3 and the central control module; the negative electrode of the clamping diode D2 is connected to the power supply voltage (3.3V).

[0059] Alternatively, if Figure 3 As shown, the first voltage detection unit includes diodes D4 and D5, resistors R5, R6, R7, R8 and capacitor C3. The positive electrodes of diodes D4 and D5 are respectively connected to the motor voltage output end of the motor interface unit, and the negative electrodes are respectively connected to the first end of resistor R5; the first end of resistor R6 is connected to the second end of resistor R5, and the second end is connected to the first end of resistor R8, the first end of capacitor C3 and the first end of resistor R7; the second end of resistor R8 and the second end of capacitor C3 are grounded, and the second end of resistor R7 is connected to the central control module.

[0060] The working principle of the first detection module is described below: Figure 4 As shown, when the corresponding power supply voltage is obtained, the fault detection circuit can start self-checking, first self-checking the motor control circuit.

[0061] If no signal is detected to turn on the relay, the motor output port (such as Figure 2 and Figure 3 If there is no working voltage at the motor output port, it indicates that the relay is not damaged. At the same time, if there is working voltage at the motor output port, it detects whether there is current in the motor control circuit to determine whether there is any abnormality in the motor control circuit and the motor.

[0062] If a control relay signal is detected, the motor output port is checked for working voltage. If there is no working voltage at the motor output port, it is determined that the relay is damaged and the detection resistor is damaged. If there is working voltage at the motor output port, the motor is checked for current to determine whether the motor is abnormal.

[0063] During the detection of the motor current, when current passes through the current sampling resistor R2, part of the current will pass through the magnetic bead L1 and capacitor C1 to eliminate the motor interference, and enter the control chip (connected to the central control module through the interface TEST-ADC) after passing through the chip IO port protection circuit composed of clamping diodes D2 and D3, and then the motor current value is converted by the high-precision ADC.

[0064] During the detection of motor voltage, when the motor rotates forward, its positive voltage will pass through diode D4 / D5 and then through resistors R5, R6, and R7 for voltage division. Then, the voltage division will pass through capacitor C3 to filter out interference waves and then enter the control chip through protection resistor R7 (connected to the central control module through interface Moter ADC), and then the motor voltage value will be converted by high-precision ADC.

[0065] The specific circuit structure and working principle of the second detection module in the embodiment of the present application are described below.

[0066] like Figure 5 As shown, the second detection module includes a first interface unit, a second current detection unit (also called a lighting / disinfection current detection unit) and a second voltage detection unit (also called a lighting / disinfection voltage detection unit).

[0067] The second detection module is connected to the first control circuit and the first functional module respectively through the first interface unit. The second current detection unit and the second voltage detection unit are independent of each other; one end of the second current detection unit is connected to the first interface unit, and the other end is connected to the central control module; one end of the second voltage detection unit is connected to the first interface unit, and the other end is connected to the central control module.

[0068] Optionally, the circuit structure of the first interface unit can be specifically seen Figure 5 The schematic diagram shown in FIG. 1 shows a circuit including resistors R9 and R13, capacitor C4 and transistor Q2. In one example, the chip CN2, capacitor CY1 and interface 32V-LED are part of the first interface unit.

[0069] Alternatively, if Figure 5 As shown, the second current detection unit includes a current sampling resistor R15, a magnetic bead L2, a capacitor C6 and clamping diodes D6 and D7; the first end of the current sampling resistor R15 is connected to the first end of the magnetic bead L2 and connected to the first interface unit, and the second end is connected to the first end of the capacitor C6 and the positive electrode of the clamping diode D7 and is grounded; the second end of the magnetic bead L2 is connected to the positive electrode of the clamping diode D6, the negative electrode of the clamping diode D7 and the second end of the capacitor C6 and is connected to the central control module; the negative electrode of the clamping diode D6 is connected to the power supply voltage (3.3V).

[0070] Alternatively, if Figure 5 As shown, the second voltage detection unit includes resistors R10, R11, R12, R14 and capacitor C5; the first end of resistor R10 is connected to the first interface unit, and the second end is connected to resistor R11; the second end of resistor R11 is connected to the first end of resistor R12 and the first end of resistor R14; the second end of resistor R12 is connected to the first end of capacitor C5 and is grounded; the second end of resistor R14 is connected to the second end of capacitor C5 and is connected to the central control module.

[0071] The working principle of the second detection module is described below: Figure 6 As shown, after the power supply voltage is obtained, the self-test can be started through the second detection module.

[0072] When the first functional module does not receive the control signal, it detects whether there is voltage and current at the interface of the first functional module. If there is voltage and current, it is determined that the first control circuit is abnormal; if there is no voltage and current, it is determined that the first control circuit is normal.

[0073] If the first functional module receives the control signal and detects that the voltage at the interface of the first functional module is abnormal and the current is normal, it can be determined that the first functional module is abnormal; if the voltage is normal and the current is abnormal, it is determined that the first control circuit is abnormal.

[0074] In the process of current detection by the second current detection unit, when current passes through the current sampling resistor R15, part of the current will pass through the magnetic bead L2 and the capacitor C6 to eliminate current interference, and then enter the control chip (such as Figure 5 The interface TEST-ADC shown is then used to convert the current value of the first functional module through a high-precision ADC.

[0075] During the voltage detection process by the second voltage detection unit, the positive voltage of the first functional module is divided by resistors R10, R11, and R12, and the divided voltage is filtered out by capacitor C5 and then enters the control chip through protection resistor R14 (such as Figure 5 The interface LED ADC shown is then converted by a high-precision ADC to obtain the lighting / disinfection voltage value.

[0076] The specific circuit structure and working principle of the third detection module in the embodiment of the present application are described below.

[0077] Alternatively, if Figure 7 As shown, the third detection module includes a second interface unit and a zero-crossing detection unit. The zero-crossing detection unit includes a diode D8 arranged at the front end and resistors R16, R17, R19, and R20 for voltage division, resistors R18, R21, a transistor Q3, and a capacitor C7 for filtering arranged at the rear end, and a photocoupler U1 connecting the front end and the rear end. One end of the second interface unit is connected to the second functional module, and the other end is connected to the front end of the zero-crossing detection unit; the rear end of the zero-crossing detection unit is connected to the central control module.

[0078] The working principle of the third detection module is described below: Figure 8 As shown, when the power supply voltage (3.3V) is obtained, a self-check can be performed through the third detection module.

[0079] When the second functional module does not receive the control signal, a zero-crossing detection is performed. If there is a zero-crossing signal, it can be determined that the second control circuit is abnormal.

[0080] When the second functional module receives the control signal, a zero-crossing detection is performed. If there is no zero-crossing signal, it can be determined that the second functional module is abnormal.

[0081] During the zero-crossing detection process, the AC power is divided by resistors R16, R17, R19, and R20, and then passes through diode D8. At this time, the voltage direction is converted, and the AC signal is transmitted to the back end through optocoupler U1 isolation. The back end receives the signal, filters it through capacitor C7, and then controls the conduction and closing of transistor Q3 through resistor R3 to generate an AC 50hz frequency signal and output it to the central control module.

[0082] Optionally, in the above embodiment, in addition to outputting the detection results of each detection module to the central control module for processing, a calculation unit can also be separately arranged in the detection module, such as arranging a calculation unit in the first detection module to directly output the motor current value and the motor voltage value.

[0083] The control circuit of the device provided in this application is described below in conjunction with the accompanying drawings.

[0084] like Figure 1 As shown, the control circuit of the device includes a central control module, a drive control circuit for driving the motor and / or functional module configured for the device, and a fault detection circuit provided in the above embodiments.

[0085] The drive control circuit includes at least one of a motor control circuit, a first control circuit and a second control circuit, and each control circuit is connected to the central control module. The fault detection circuit is connected to the motor and / or functional module configured by the device.

[0086] In one example, each detection module included in the fault detection circuit is also connected to the central control module respectively to receive a working instruction issued by the central control module and transmit detection information to the central control module.

[0087] In a feasible embodiment, considering the problem of communication interference, the central control module arranged in the embodiment of the present application includes an MCU chip (such as a wireless communication sub-module) integrated with the wireless communication sub-module. Fig. 9 The wireless communication submodule is configured with at least two of a network communication unit (WiFi), a Bluetooth communication unit, and an infrared communication unit.

[0088] The device provided in this application is described below with reference to the accompanying drawings.

[0089] It is understandable that the fault detection circuit and the control circuit of the device provided in the above embodiments can be introduced into corresponding devices for application. Fig. 9 A clothes drying machine in which a control circuit of the device is introduced is described.

[0090] The clothes drying machine includes a main unit, a clothes drying rod connected to the main unit, and a functional module.

[0091] Optionally, the central control module described in the above embodiment can be arranged inside the main unit, the motor can be used to drive the drying rod to work, and each configured functional module has its own corresponding control circuit.

[0092] In a feasible embodiment, the functional modules configured for the clothes drying machine, the first functional module may include a lighting module and / or a disinfection module; the second functional module may include a drying module and / or an air drying module. It is understandable that each functional module is arranged as an independent device, and an independent detection module can be configured in fault detection, such as Fig. 9 shown.

[0093] In one example, if fault information appears during the self-check process, the central control module will execute the fault algorithm to judge the abnormality after receiving the abnormal data, and upload the corresponding data to the cloud via WiFi and push it to the user and the manufacturer. Correspondingly, the user can use the mobile phone APP to send control information to the clothes drying machine through the mobile phone Bluetooth function (infrared function) or the Bluetooth remote control (infrared remote control) via Bluetooth (infrared). The central control module receives data through the Bluetooth function (infrared function) and processes the information through the internal algorithm. The internal MCU function of the central control module controls the clothes drying machine to start working.

[0094] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that shown or described in the drawings.

[0095] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A fault detection circuit, characterized in that: The circuit includes a first detection module, a second detection module or a third detection module, each detection module is connected to the central control module respectively: A first detection module, connected to the motor control circuit and the motor respectively, for transmitting the detected control signal sent by the motor control circuit and the voltage and current information of the motor to the central control module to determine whether there is an abnormality in the motor control circuit and / or the motor; The first detection module is composed of at least a current sampling resistor, a magnetic bead, a capacitor, and a diode; A second detection module is connected to the first functional module using a DC voltage and the first control circuit of the first functional module, respectively, and is used to transmit the control signal sent by the first control circuit and the voltage and current information of the first functional module to the central control module to determine whether the first functional module and / or the first control circuit are abnormal; The second detection module is composed of at least a current sampling resistor, a magnetic bead, a capacitor, and a diode; A third detection module, comprising a zero-crossing detection unit and a second interface unit, wherein the second interface unit is respectively connected to a second functional module using an AC voltage, a second control circuit and a front end of the zero-crossing detection unit, and a rear end of the zero-crossing detection unit is connected to a central control module, and is used to transmit the control signal and the zero-crossing signal received by the second functional module to the central control module, so as to determine whether the second functional module and / or the second control circuit that sends the control signal is abnormal; the zero-crossing detection unit comprises a diode arranged at the front end and a resistor for voltage division, a resistor, a triode and a capacitor for filtering arranged at the rear end, and a photoelectric coupler connecting the front end and the rear end; Wherein, the motor control circuit, the first control circuit and the second control circuit are connected to the central control module.

2. The fault detection circuit according to claim 1, characterized in that: The first detection module includes a motor interface unit, a first current detection unit and a first voltage detection unit; The motor interface unit is connected to the motor control circuit, the motor, the first current detection unit and the first voltage detection unit respectively; One end of the first current detection unit is connected to the motor interface unit, and the other end is connected to the central control module; the first current detection unit includes a current sampling resistor R2, a magnetic bead L1, a capacitor C1, a clamping diode D2 and a clamping diode D3; the first end of the current sampling resistor R2 is connected to the first end of the magnetic bead L1 and to the motor interface unit, and the second end is connected to the first end of the capacitor C1, the positive electrode of the clamping diode D3 and grounded; the second end of the magnetic bead L1 is connected to the second end of the capacitor C1, the positive electrode of the clamping diode D2, the negative electrode of the clamping diode D3 and the central control module; the negative electrode of the clamping diode D2 is connected to the supply voltage; One end of the first voltage detection unit is connected to the motor interface unit, and the other end is connected to the central control module; the first voltage detection unit includes a diode D4, a diode D5, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C3; the positive electrodes of the diode D4 and the diode D5 are respectively connected to the motor voltage output end of the motor interface unit, and the negative electrodes are respectively connected to the first end of the resistor R5; the first end of the resistor R6 is connected to the second end of the resistor R5, and the second end is connected to the first end of the resistor R8, the first end of the capacitor C3 and the first end of the resistor R7; the second end of the resistor R8 and the second end of the capacitor C3 are grounded, and the second end of the resistor R7 is connected to the central control module.

3. The fault detection circuit according to claim 1, characterized in that: The second detection module includes a first interface unit, a second current detection unit and a second voltage detection unit; The first interface unit is connected to the first functional module, the first control circuit, the second current detection unit and the second voltage detection unit respectively; One end of the second current detection unit is connected to the first interface unit, and the other end is connected to the central control module; the second current detection unit includes a current sampling resistor R15, a magnetic bead L2, a capacitor C6, a clamping diode D6 and a clamping diode D7; the first end of the current sampling resistor R15 is connected to the first end of the magnetic bead L2 and connected to the first interface unit, and the second end is connected to the first end of the capacitor C6, the positive electrode of the clamping diode D7 and grounded; the second end of the magnetic bead L2 is connected to the positive electrode of the clamping diode D6, the negative electrode of the clamping diode D7 and the second end of the capacitor C6 and connected to the central control module; the negative electrode of the clamping diode D6 is connected to the power supply voltage; One end of the second voltage detection unit is connected to the first interface unit, and the other end is connected to the central control module; the second voltage detection unit includes a resistor R10, a resistor R11, a resistor R12, a resistor R14 and a capacitor C5; the first end of the resistor R10 is connected to the first interface unit, and the second end is connected to the resistor R11; the second end of the resistor R11 is connected to the first end of the resistor R12 and the first end of the resistor R14; the second end of the resistor R12 is connected to the first end of the capacitor C5 and is grounded; the second end of the resistor R14 is connected to the second end of the capacitor C5 and is connected to the central control module.

4. A control circuit of a device, characterized in that: include: A central control module, a drive control circuit for a motor and / or a functional module configured for the drive device, and a fault detection circuit as described in any one of claims 1 to 3; Wherein, the drive control circuit is connected to the central control module and includes at least one of a motor control circuit, a first control circuit and a second control circuit; The fault detection circuit is connected to the motor and / or functional module configured for the device.

5. The control circuit of the device according to claim 4, characterized in that The central control module includes an MCU chip integrating a wireless communication submodule, which is used to transmit detection result information to different external devices through different wireless communication methods; the wireless communication submodule is configured with at least two of a network communication unit, a Bluetooth communication unit and an infrared communication unit.

6. A clothes drying machine, characterized in that: The operation of the clothes drying machine is controlled by the control circuit of the device described in any one of claims 4-5; the clothes drying machine includes: a main unit, a clothes drying rod connected to the main unit and a functional module; the central control module is arranged inside the main unit; the motor is used to drive the clothes drying rod to work.

7. The clothes drying machine according to claim 6, characterized in that: The functional modules of the clothes drying machine include the first functional module and / or the second functional module; the first functional module includes a lighting module and / or a disinfection module; the second functional module includes a drying module and / or an air-drying module.

Images