Motor drive signal switching circuit and electrical equipment

Abstract

This application relates to a motor drive signal switching circuit and electrical device. The circuit includes: a first signal conversion module, a second signal conversion module, a signal switching module, and a control module. The control module is used to: send a motor drive signal to the target signal conversion module currently in use between the first and second signal conversion modules; and receive feedback signals output by the motor. If the feedback signal indicates that the motor is not operating normally, the control module sends a switching signal to the signal switching module to switch the target signal conversion module. This application enables switching to another signal conversion module when one signal conversion module fails, avoiding motor shutdown due to signal conversion module failure and improving the stability of motor operation.

Description

Technical Field

[0001] This application relates to the field of motor drive technology, and in particular to a motor drive signal switching circuit and electrical equipment. Background Technology

[0002] DC motors are widely used in industrial automation, robot control, and electric vehicles due to their excellent speed regulation performance and control characteristics. However, traditional DC motor control systems typically employ single-channel voltage signal conditioning (VSP) control and rely on a single speed feedback loop for closed-loop control. If this control loop or feedback loop malfunctions, such as sensor failure, circuit disconnection, or controller abnormality, the system will fail to operate normally, potentially leading to equipment shutdown and impacting production efficiency and safety.

[0003] In addition, existing systems lack effective fault tolerance mechanisms when dealing with sudden interference or transient failures, making it difficult to meet the requirements of high reliability and high stability application scenarios. Utility Model Content

[0004] In view of this, in order to solve some or all of the above-mentioned technical problems, embodiments of this application provide a motor drive signal switching circuit and electrical equipment.

[0005] In a first aspect, embodiments of this application provide a motor drive signal switching circuit, the circuit comprising: The system comprises a first signal conversion module, a second signal conversion module, a signal switching module, and a control module; the first signal conversion module and the second signal conversion module are used to convert a first type of motor drive signal into a second type of motor drive signal. The first drive signal output terminal of the control module is connected to the input terminal of the first signal conversion module, and the second drive signal output terminal of the control module is connected to the input terminal of the second signal conversion module. The output of the first signal conversion module is connected to the first input contact of the signal switching module, the output of the second signal conversion module is connected to the second input contact of the signal switching module, and the output contact of the signal switching module is connected to the motor drive device. The switching signal output terminal of the control module is connected to the control terminal of the signal switching module; The feedback input terminal of the control module is connected to the feedback output terminal of the motor; The control module is used to: send motor drive signals to the target signal conversion module currently in use in the first signal conversion module and the second signal conversion module; and receive feedback signals output by the motor. If the feedback signal indicates that the motor is not running normally, the control module sends a switching signal to the signal switching module to switch the target signal conversion module.

[0006] In one possible implementation, the control module includes a controller and a feedback signal conversion unit; the input terminal of the feedback signal conversion unit is the feedback input terminal of the control module and is connected to the feedback output terminal of the motor. The output of the feedback signal conversion unit is connected to the input of the controller; The switching signal output terminal of the controller is the switching signal output terminal of the control module and is connected to the signal switching module; The feedback signal conversion unit is used to: convert the level of the feedback signal output by the motor to obtain the converted feedback signal, and input the converted feedback signal into the controller; The controller is used to: determine whether the motor is operating normally based on the converted feedback signal; if not, send a switching signal to the signal switching module.

[0007] In one possible implementation, the feedback signal conversion unit includes a first feedback signal conversion subunit and a second feedback signal conversion subunit; The input terminals of both the first and second feedback signal conversion subunits are connected to the feedback output terminal of the motor. The output of the first feedback signal conversion subunit is connected to the first feedback input of the controller, and the output of the second feedback signal conversion subunit is connected to the second feedback input of the controller. The controller is configured to: receive the converted feedback signal from the target feedback signal conversion subunit currently in use between the first feedback signal conversion subunit and the second feedback signal conversion subunit; and if an abnormality is detected in the converted feedback signal, switch to the other feedback signal conversion subunit as the target feedback signal conversion subunit currently in use.

[0008] In one possible implementation, if both the converted feedback signals sent by the first feedback signal conversion subunit and the second feedback signal conversion subunit are detected to be abnormal, a switching signal is sent to the signal switching module to switch the target signal conversion module.

[0009] In one possible implementation, the first feedback signal conversion subunit includes a first signal receiving component, a first optocoupler, and a first signal conditioning component; The input terminal of the first signal receiving component is connected to the feedback output terminal of the motor, and the output terminal is connected to the input terminal of the first optocoupler. The output terminal of the first optocoupler is connected to the input terminal of the first signal conditioning component, and the output terminal of the first signal conditioning component is connected to the first feedback input terminal of the controller. The second feedback signal conversion subunit includes a second signal receiving component, a second optocoupler, and a second signal conditioning component; The input terminal of the second signal receiving component is connected to the feedback output terminal of the motor, and the output terminal is connected to the input terminal of the second optocoupler. The output of the second optocoupler is connected to the input of the second signal conditioning component, and the output of the second signal conditioning component is connected to the second feedback input of the controller.

[0010] In one possible implementation, the first signal conversion module includes a third signal receiving component, a third optocoupler, and a third signal conditioning component; The input terminal of the third signal receiving component is connected to the first drive signal output terminal of the control module, and the output terminal is connected to the input terminal of the third optocoupler. The output of the third optocoupler is connected to the input of the third signal conditioning component, and the output of the third signal conditioning component is connected to the first input contact of the signal switching module. The second signal conversion module includes a fourth signal receiving component, a fourth optocoupler, and a fourth signal conditioning component; The input terminal of the fourth signal receiving component is connected to the second drive signal output terminal of the control module, and the output terminal is connected to the input terminal of the fourth optocoupler. The output of the fourth optocoupler is connected to the input of the fourth signal conditioning component, and the output of the fourth signal conditioning component is connected to the second input contact of the signal switching module.

[0011] In one possible implementation, both the third signal conditioning component and the fourth signal conditioning component include at least one set of signal conditioning devices, each set of signal conditioning devices including two devices of the same type connected together.

[0012] In one possible implementation, in at least one group of signal conditioning devices, any group of signal conditioning devices of the type of resistors includes resistors connected in parallel, and any group of signal conditioning devices of the type of capacitors includes capacitors connected in series.

[0013] In one possible implementation, the signal switching module includes a relay; The output of the first signal conversion module is connected to the first input contact of the relay, the output of the second signal conversion module is connected to the second input contact of the relay, and the output contact of the relay is connected to the motor drive device. The switching signal output terminal of the control module is connected to the first terminal of the electromagnetic coil of the relay, and the second terminal of the electromagnetic coil is connected to the preset level terminal.

[0014] Secondly, embodiments of this application provide an electrical device, which includes: a motor, a motor drive device, and the aforementioned motor drive signal switching circuit; The output contacts of the signal switching module included in the motor drive signal switching circuit are connected to the motor drive device. The output of the motor drive unit is connected to the motor; The feedback output terminal of the motor is connected to the feedback input terminal of the control module included in the motor drive signal switching circuit.

[0015] The motor drive signal switching circuit and electrical equipment provided in this application embodiment include a first signal conversion module, a second signal conversion module, a signal switching module, and a control module. The control module sends a motor drive signal to the target signal conversion module currently in use between the first and second signal conversion modules, and receives feedback signals from the motor output. If the feedback signal indicates that the motor is not operating normally, a switching signal is sent to the signal switching module to switch the target signal conversion module. By setting redundant signal conversion modules, this application embodiment achieves switching to another signal conversion module when one signal conversion module fails, avoiding motor shutdown due to signal conversion module failure and improving the stability of motor operation. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a schematic diagram of the structure of a motor drive signal switching circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of another motor drive signal switching circuit provided in an embodiment of this application; Figure 3 A schematic diagram of another motor drive signal switching circuit provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the feedback signal conversion subunit provided in the embodiments of this application; Figure 5This is a schematic diagram of the structure of another feedback signal conversion subunit provided in an embodiment of this application; Figure 6 A schematic diagram of another motor drive signal switching circuit provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the signal conversion module provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application.

[0020] Figure label: 100 - Motor drive signal switching circuit; 101 - First signal conversion module; 1011 - Third signal receiving component; 1012 - Third optocoupler; 1013 - Third signal conditioning component; 102 - Second signal conversion module; 1021 - Fourth signal receiving component; 1022 - Fourth optocoupler; 1023 - Fourth signal conditioning component; 103 - Signal switching module; 104 - Control module; 1041 - Controller; 1042 - Feedback signal conversion unit; 10421 - First feedback signal conversion subunit; 104211 - First signal receiving component; 104212 - First optocoupler; 104213 - First signal conditioning component; 10422 - Second feedback signal conversion subunit; 104221 - Second signal receiving component; 104222 - Second optocoupler; 104223 - Second signal conditioning component; 800 - Electrical equipment; 801 - Motor; 802 - Motor drive device. Detailed Implementation

[0021] Various exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application.

[0022] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of this application are only used to distinguish different steps, devices or modules, and do not represent any specific technical meaning, nor do they indicate the logical order between them.

[0023] It should also be understood that in this embodiment, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0024] It should also be understood that any component, data or structure mentioned in the embodiments of this application can generally be understood as one or more unless explicitly defined or given contrary guidance in the context.

[0025] Furthermore, the term "and / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "or" relationship.

[0026] It should also be understood that the description of the various embodiments in this application emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0027] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0028] Techniques, circuits, and devices known to a person skilled in the art may not be discussed in detail, but where appropriate, such techniques, circuits, and devices should be considered part of the instruction manual.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. To facilitate understanding of the embodiments of this application, the application will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] Figure 1 This is a schematic diagram of a motor drive signal switching circuit 100 provided in an embodiment of this application. This circuit can be applied to various devices that require driving DC motors, such as air conditioners and robots. The circuit specifically includes: a first signal conversion module 101, a second signal conversion module 102, a signal switching module 103, and a control module 104.

[0032] The first signal conversion module 101 and the second signal conversion module 102 are used to convert a first type of motor drive signal into a second type of motor drive signal. For example, the first type of motor drive signal is a PWM signal, and the second type of motor drive signal is a VSP signal.

[0033] like Figure 1As shown, the first drive signal output terminal of the control module 104 is connected to the input terminal of the first signal conversion module 101, and the second drive signal output terminal of the control module 104 is connected to the input terminal of the second signal conversion module 102.

[0034] In this embodiment, the control module 104 can send a motor drive signal to the first signal conversion module 101 or the second signal conversion module 102, and the type of the motor drive signal can be a preset type. For example, the control module 104 sends a PWM signal for controlling the motor speed to the first signal conversion module 101 or the second signal conversion module 102.

[0035] The output terminal of the first signal conversion module 101 is connected to the first input contact of the signal switching module 103, the output terminal of the second signal conversion module 102 is connected to the second input contact of the signal switching module 103, and the output contact of the signal switching module 103 is connected to the motor drive device.

[0036] The switching signal output terminal of the control module 104 is connected to the control terminal of the signal switching module 103.

[0037] In this embodiment, the signal switching module 103 may include a single-pole double-throw switch or a double-pole double-throw switch. The switch can selectively connect either the first contact or the second contact to the output contact. The signal switching module 103 may include various types of switching devices, such as relays, transistors, etc. The control module 104 can send a switching signal to the signal switching module 103, and the signal switching module 103, according to the switching signal, connects the output contact to either the first contact or the second contact.

[0038] Optional, such as Figure 1 As shown, the signal switching module 103 includes a relay. The output terminal of the first signal conversion module 101 is connected to the first input contact of the relay, the output terminal of the second signal conversion module 102 is connected to the second input contact of the relay, and the output contact of the relay is connected to the motor drive device. The switching signal output terminal of the control module 104 is connected to the first end of the electromagnetic coil of the relay, and the second end of the electromagnetic coil is connected to a preset level terminal (e.g., ...). Figure 1 As shown, the preset level is high (VDD). The control module 104 can output a high level or a low level to the electromagnetic coil of the relay, thereby causing the switch inside the relay to perform the corresponding action. Because relays have higher load-carrying capacity and stronger anti-interference ability, the stability of the drive motor can be improved by using relays.

[0039] The feedback input terminal of the control module 104 is connected to the feedback output terminal of the motor. For example... Figure 1 As shown, the feedback output terminal of the motor outputs a feedback signal FB, and the control module 104 receives the feedback signal FB.

[0040] The control module 104 is used to: send motor drive signals to the target signal conversion module currently in use in the first signal conversion module 101 and the second signal conversion module 102; and receive feedback signals output by the motor. If the feedback signal indicates that the motor is not running normally, the control module 104 sends a switching signal to the signal switching module 103 to switch the target signal conversion module.

[0041] In this embodiment, the target signal conversion module currently used in the first signal conversion module 101 and the second signal conversion module 102 is one of the two. The control module 104 sends a first type of motor drive signal to the target signal conversion module, which converts the motor drive signal to a second type of motor drive signal. This second type of motor drive signal is then sent to the motor drive device via the signal switching module 103. Under the control of the received motor drive signal, the motor drive device drives the motor to rotate.

[0042] During motor operation, it can output a feedback signal representing the motor speed in real time (for example, the feedback signal is a pulse signal, with 12 pulses per revolution during normal motor operation). The control module 104 identifies the feedback signal to determine whether the motor is operating normally. If the motor is determined to be operating abnormally, the signal switching module 103 can be controlled to perform a switching action, switching the currently used signal conversion module to another unused signal conversion module. The switched signal conversion module becomes the new target signal conversion module.

[0043] The motor drive signal switching circuit provided in this application embodiment includes a first signal conversion module 101, a second signal conversion module 102, a signal switching module 103, and a control module 104. The control module 104 sends a motor drive signal to the target signal conversion module currently in use in the first and second signal conversion modules 101 and 102, and receives feedback signals from the motor output. If the feedback signal indicates that the motor is not running normally, it sends a switching signal to the signal switching module 103 to switch the target signal conversion module. By setting redundant signal conversion modules, this application embodiment achieves switching to another signal conversion module when one signal conversion module fails, avoiding motor shutdown due to signal conversion module failure and improving the stability of motor operation.

[0044] In some optional implementations of this embodiment, such as Figure 2 As shown, the control module 104 includes a controller 1041 and a feedback signal conversion unit 1042. The input terminal of the feedback signal conversion unit 1042 is the feedback input terminal of the control module 104 and is connected to the feedback output terminal of the motor.

[0045] The output of the feedback signal conversion unit 1042 is connected to the input of the controller 1041.

[0046] The switching signal output terminal of the controller 1041 is the switching signal output terminal of the control module 104 and is connected to the signal switching module 103.

[0047] The feedback signal conversion unit 1042 is used to: convert the level of the feedback signal FB1 output by the motor to obtain the converted feedback signal FB2, and input the converted feedback signal FB2 into the controller 1041.

[0048] In order for the controller 1041 to recognize the feedback signal output by the motor, this embodiment includes a feedback signal conversion unit 1042 to convert the level of the feedback signal output by the motor into a level that matches the I / O port of the controller 1041. As an example, the feedback signal conversion unit 1042 may include an operational amplifier, as well as necessary resistors, capacitors, and other devices to convert the level of the feedback signal.

[0049] The controller 1041 is used to: determine whether the motor is running normally based on the converted feedback signal; if not, send a switching signal to the signal switching module 103.

[0050] The controller 1041 can be any device capable of logic processing, such as a DSP or MCU chip. The controller 1041 can identify the converted feedback signal to determine whether the motor is operating normally. For example, if the converted feedback signal is a pulse signal, the controller 1041 can determine whether the motor is operating normally based on the number of pulse signals received per unit time.

[0051] In this embodiment, by setting a feedback signal conversion unit 1042, the feedback signal output by the motor can be converted to meet the requirements of the I / O port of the controller 1041, which helps the controller 1041 to more accurately identify the feedback signal and improve the accuracy of motor control.

[0052] In some optional implementations of this embodiment, such as Figure 3 As shown, the feedback signal conversion unit 1042 includes a first feedback signal conversion subunit 10421 and a second feedback signal conversion subunit 10422. The internal circuit structures of the first feedback signal conversion subunit 10421 and the second feedback signal conversion subunit 10422 can be the same.

[0053] The input terminals of the first feedback signal conversion subunit 10421 and the second feedback signal conversion subunit 10422 are both connected to the feedback output terminal of the motor.

[0054] The output of the first feedback signal conversion subunit 10421 is connected to the first feedback input of the controller 1041, and the output of the second feedback signal conversion subunit 10422 is connected to the second feedback input of the controller 1041.

[0055] The controller 1041 is configured to: receive the converted feedback signal from the target feedback signal conversion subunit currently in use in the first feedback signal conversion subunit 10421 and the second feedback signal conversion subunit 10422; and if an abnormality is detected in the converted feedback signal, switch to another feedback signal conversion subunit as the target feedback signal conversion subunit currently in use.

[0056] The target feedback signal conversion subunit can be either the first feedback signal conversion subunit 10421 or the second feedback signal conversion subunit 10422. Both feedback signal conversion subunits can convert the feedback signal simultaneously, and the controller 1041 can select one as the target feedback signal conversion subunit. If the controller 1041 detects an abnormality in the feedback signal output by the target feedback signal conversion subunit (such as signal interruption, excessive deviation between the rotational speed represented by the feedback signal and the set normal rotational speed range), it can switch to the other feedback signal conversion subunit as the new target feedback signal conversion subunit.

[0057] This embodiment sets up two feedback signal conversion subunits, which can back up the currently used feedback signal conversion subunit. In the event of a failure of one feedback signal conversion subunit, the system can switch to the other feedback signal conversion subunit, ensuring that the controller 1041 can stably receive feedback signals, thereby improving the stability of motor operation.

[0058] In some optional implementations of this embodiment, the controller 1041 is further configured to: if it detects that the converted feedback signals sent by the first feedback signal conversion subunit 10421 and the second feedback signal conversion subunit 10422 are both abnormal, send a switching signal to the signal switching module 103 to switch the target signal conversion module.

[0059] For example, after the controller 1041 determines that the feedback signal sent by the first feedback signal conversion subunit 10421 is abnormal, it determines that the first feedback signal conversion subunit 10421 may be abnormal. At this time, it receives a feedback signal from the second feedback signal conversion subunit 10422. If the feedback signal is still abnormal, it determines that the signal conversion module currently in use may be abnormal. At this time, it can switch to another signal conversion module to drive the motor.

[0060] Optionally, a feedback signal anomaly count variable can be set in the controller 1041. When any feedback signal sent by any feedback signal conversion subunit is abnormal, this variable is incremented by 1. When the variable is 2, it indicates that both feedback signal conversion subunits are abnormal, and a switching signal is sent to the signal switching module 103. After the user repairs the abnormal feedback signal conversion subunit, the above variable can be cleared to zero, thereby accurately recording the number of abnormal feedback signal conversion subunits. In the same way, the controller 1041 can also record the number of abnormal signal conversion modules in real time, and output a warning message to the user when both signal conversion modules are abnormal.

[0061] This embodiment achieves orderly repair of motor drive faults and improves the stability of motor drive by switching the signal conversion module when both feedback signal conversion subunits are abnormal.

[0062] In some optional implementations of this embodiment, such as Figure 4 As shown, the first feedback signal conversion subunit 10421 includes a first signal receiving component 104211, a first optocoupler 104212, and a first signal conditioning component 104213.

[0063] The input terminal of the first signal receiving component 104211 is connected to the feedback output terminal of the motor, and the output terminal of the first signal receiving component 104211 is connected to the input terminal of the first optocoupler 104212.

[0064] The output terminal of the first optocoupler 104212 is connected to the input terminal of the first signal conditioning component 104213, and the output terminal of the first signal conditioning component 104213 is connected to the first feedback input terminal of the controller 1041.

[0065] The first signal receiving component 104211 receives a feedback signal and, based on the feedback signal, drives the photodiode inside the first optocoupler 104212 to emit light or extinguish, thereby driving the switching element in the first optocoupler 104212 to turn on or off. The first signal conditioning component 104213, under the control of the switching element, outputs a corresponding converted feedback signal. In one embodiment, such as... Figure 5 As shown, resistors R1 and R2, and capacitor C1 constitute the first signal receiving component 104211. Resistors R3 and R4, and capacitors C2 and C3 constitute the first signal conditioning component 104213. The first signal conditioning component 104213 is connected to an external +3.3V power supply. Figure 5 The circuit shown is merely an example and does not constitute a limitation on the structure of the first feedback signal conversion subunit 10421 and the second feedback signal conversion subunit 10422 in this embodiment.

[0066] Similarly, the second feedback signal conversion subunit 10422 includes a second signal receiving component 104221, a second optocoupler 104222, and a second signal conditioning component 104223. The input terminal of the second signal receiving component 104221 is connected to the feedback output terminal of the motor, and the output terminal of the second signal receiving component 104221 is connected to the input terminal of the second optocoupler 104222. The output terminal of the second optocoupler 104222 is connected to the input terminal of the second signal conditioning component 104223, and the output terminal of the second signal conditioning component 104223 is connected to the second feedback input terminal of the controller 1041. Figure 5 As shown, resistors R5 and R6, and capacitor C4 constitute the first signal receiving component 104211. Resistors R7 and R8, and capacitors C5 and C6 constitute the first signal conditioning component 104213.

[0067] This embodiment, by setting a signal receiving component, an optocoupler, and a signal conditioning component in the feedback signal conversion subunit, can utilize the electrical isolation characteristics of the optocoupler to reduce electromagnetic interference and improve the stability of the feedback signal conversion.

[0068] In some optional implementations of this embodiment, such as Figure 6 As shown, the first signal conversion module 101 includes a third signal receiving component 1011, a third optocoupler 1012, and a third signal conditioning component 1013.

[0069] The input terminal of the third signal receiving component 1011 is connected to the first drive signal output terminal of the control module 104, and the output terminal is connected to the input terminal of the third optocoupler 1012.

[0070] The output terminal of the third optocoupler 1012 is connected to the input terminal of the third signal conditioning component 1013, and the output terminal of the third signal conditioning component 1013 is connected to the first input contact of the signal switching module 103.

[0071] The third signal receiving component 1011 receives the first type of motor drive signal output by the control module 104. Based on the motor drive signal, it controls the photodiode inside the third optocoupler 1012 to light up or turn off, thereby driving the switching element in the third optocoupler 1012 to turn on or off. Under the control of the switching element, the third signal conditioning component 1013 outputs the corresponding converted motor drive signal.

[0072] In one embodiment, such as Figure 7As shown, resistors R9 and R10 and transistor Q1 constitute the third signal receiving component 1011, and the motor drive signal (PWM1) is input from resistor R9. The third signal conditioning component 1013 can use resistors and capacitors to form an RC filter network, and output a second type of motor drive signal based on the level change caused by the on / off state of the switching elements in the third optocoupler 1012. Figure 7 As shown, the third signal conditioning component 1013 converts the PWM1 signal into a VSP1 signal. The VSP1 signal can be input to the first contact of the signal switching module 103.

[0073] Similarly, the second signal conversion module 102 includes a fourth signal receiving component 1021, a fourth optocoupler 1022, and a fourth signal conditioning component 1023; the input terminal of the fourth signal receiving component 1021 is connected to the second drive signal output terminal of the control module 104, and the output terminal is connected to the input terminal of the fourth optocoupler 1022; the output terminal of the fourth optocoupler 1022 is connected to the input terminal of the fourth signal conditioning component 1023, and the output terminal of the fourth signal conditioning component 1023 is connected to the second input contact of the signal switching module 103. Figure 7 As shown, resistors R11 and R12 and transistor Q2 constitute the fourth signal receiving component 1021, and the motor drive signal (PWM2) is input from resistor R11. The fourth signal conditioning component 1023 converts the PWM2 signal into a VSP2 signal. The VSP2 signal can be input to the second contact of the signal switching module 103.

[0074] In this embodiment, by setting a signal receiving component, an optocoupler, and a signal conditioning component in the first signal conversion module 101 and the second signal conversion module 102, the electrical isolation characteristics of the optocoupler can be utilized to reduce electromagnetic interference and accurately and stably convert the type of motor drive signal.

[0075] In some optional implementations of this embodiment, both the third signal conditioning component 1013 and the fourth signal conditioning component 1023 include at least one set of signal conditioning devices, each set of signal conditioning devices includes two devices of the same type, and the two devices of the same type are connected together.

[0076] The types of at least one group of signal conditioning devices mentioned above can include resistors, capacitors, etc., that is, for any group of signal conditioning devices, the corresponding type can be resistors or capacitors, etc. The connection method of the devices included in each group of signal conditioning devices can be set according to actual needs, including series and parallel connections.

[0077] This embodiment provides at least one set of signal conditioning devices in the third signal conditioning component 1013 and the fourth signal conditioning component 1023. Each set of signal conditioning devices includes redundant devices, so that if one device fails, the other can still work, enabling the signal conversion module to continue to convert the motor drive signal, thereby reducing the risk of motor shutdown due to device failure and improving the stability of motor operation.

[0078] In some optional implementations of this embodiment, in at least one group of signal conditioning devices, the resistors in any group of signal conditioning devices of the type of resistor are connected in parallel, and the capacitors in any group of signal conditioning devices of the type of capacitor are connected in series.

[0079] like Figure 7 As shown, the third signal conditioning component 1013 includes resistors R13-R20 and capacitors C7-C10. R15, R16, R17, R18, R19, and R20 are three sets of resistor-type signal conditioning devices, while capacitors C7, C8, C9, and C10 are capacitor-type signal conditioning components. The third signal conditioning component 1013 has the same structure and device parameters as the third signal conditioning component 1014. When a resistor is damaged and becomes open-circuited, the signal can still be transmitted using another resistor; similarly, when a capacitor is short-circuited due to breakdown, the signal can still be transmitted using another capacitor, thus ensuring uninterrupted signal transmission.

[0080] Typically, the signal conversion module converts the PWM signal into a VSP signal. The conversion process only requires adjusting the VSP signal based on the speed deviation fed back from the motor, without needing to consider the absolute voltage magnitude. Therefore, if any set of signal conditioning devices malfunctions, although the equivalent resistance or capacitance changes, it does not affect the ability of the converted motor drive signal to drive the motor.

[0081] This embodiment, by connecting resistors in parallel and capacitors in series, ensures that the signal transmission line is not interrupted when a resistor or capacitor fails, thereby improving the stability of motor drive signal transmission.

[0082] Optionally, the control module described above can also have a fault self-diagnosis function, that is, it can record the time, type, and handling process of abnormal events, facilitating subsequent analysis and optimization. Simultaneously, the circuit also supports a manual switching mode, allowing operators to manually switch between the signal conversion module and the feedback signal conversion subunit under specific circumstances.

[0083] Figure 8 This is a schematic diagram of the structure of an electrical device 800 provided in an embodiment of this application. This electrical device can be used for various devices requiring a drive motor, such as air conditioners, robots, and electric vehicles. Figure 8As shown, the electrical device specifically includes: a motor 801, a motor drive device 802, and a motor drive signal switching circuit 100 described in the above embodiment. The motor drive signal switching circuit inputs a type-converted motor drive signal to the motor drive device. The motor drive device may include a circuit for driving the motor to rotate, and under the control of the motor drive signal, the circuit outputs a drive current to the motor.

[0084] like Figure 8 As shown, the output contacts of the signal switching module included in the motor drive signal switching circuit are connected to the motor drive device; the output terminal of the motor drive device is connected to the motor; and the feedback output terminal of the motor is connected to the feedback input terminal of the control module included in the motor drive signal switching circuit.

[0085] The electrical equipment provided in this application embodiment, by applying the above-mentioned motor drive signal switching circuit and utilizing redundant signal conversion modules, enables switching to another signal conversion module when one signal conversion module fails, thereby avoiding motor shutdown due to signal conversion module failure and improving the operational stability of the electrical equipment.

[0086] When it is necessary to compare the functions of certain electrical devices with those provided in the embodiments of this application to determine whether they are consistent with the solution of this application, the following method can be used: 1. The circuit design for the dual-channel signal conversion module includes the following three aspects: First, compare the hardware structure and check whether the controlled product contains two independent VSP output circuits, including components such as adjustment chips, PWM modules, and VSP conversion circuits.

[0087] Second, functional consistency judgment to confirm whether the two circuits have independent control capabilities, that is, when one circuit fails, the other circuit can still drive the motor.

[0088] Third, logical relationship verification: through testing or reverse engineering, determine whether the two circuits are independent of each other and have no cross control.

[0089] 2. For the dual-channel speed feedback signal conversion subunit, the following three aspects are included: First, compare the hardware structure and check whether the product being compared contains two independent speed feedback detection circuits, such as two detection I / O ports.

[0090] Second, verify the signal acquisition method to confirm whether the speed data is acquired by using the MCU's IO interrupt to detect the pulse frequency.

[0091] Third, functional consistency judgment: determine whether the two feedback channels work independently and can still provide effective feedback when one channel is abnormal.

[0092] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different circuits to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0093] The steps of the circuits or algorithms described in connection with the embodiments disclosed herein can be implemented in hardware, in a software module executed by a processor, or in a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0094] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0095] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A motor drive signal switching circuit, characterized by, The circuit includes: The system comprises a first signal conversion module, a second signal conversion module, a signal switching module, and a control module; the first signal conversion module and the second signal conversion module are used to convert a first type of motor drive signal into a second type of motor drive signal. The first drive signal output terminal of the control module is connected to the input terminal of the first signal conversion module, and the second drive signal output terminal of the control module is connected to the input terminal of the second signal conversion module. The output terminal of the first signal conversion module is connected to the first input contact of the signal switching module, the output terminal of the second signal conversion module is connected to the second input contact of the signal switching module, and the output contact of the signal switching module is connected to the motor drive device. The switching signal output terminal of the control module is connected to the control terminal of the signal switching module; The feedback input terminal of the control module is connected to the feedback output terminal of the motor; The control module is configured to: send a motor drive signal to the target signal conversion module currently in use among the first signal conversion module and the second signal conversion module; and receive a feedback signal output by the motor, and if the feedback signal indicates that the motor is not operating normally, send a switching signal to the signal switching module to switch the target signal conversion module.

2. The circuit of claim 1, wherein, The control module includes a controller and a feedback signal conversion unit; The input terminal of the feedback signal conversion unit is the feedback input terminal of the control module and is connected to the feedback output terminal of the motor. The output terminal of the feedback signal conversion unit is connected to the input terminal of the controller; The switching signal output terminal of the controller is the switching signal output terminal of the control module and is connected to the signal switching module; The feedback signal conversion unit is used to: convert the level of the feedback signal output by the motor to obtain the converted feedback signal, and input the converted feedback signal into the controller; The controller is used to: determine whether the motor is operating normally based on the converted feedback signal; if not, send a switching signal to the signal switching module.

3. The circuit of claim 2, wherein, The feedback signal conversion unit includes a first feedback signal conversion subunit and a second feedback signal conversion subunit; The input terminals of both the first feedback signal conversion subunit and the second feedback signal conversion subunit are connected to the feedback output terminal of the motor; The output terminal of the first feedback signal conversion subunit is connected to the first feedback input terminal of the controller, and the output terminal of the second feedback signal conversion subunit is connected to the second feedback input terminal of the controller. The controller is configured to: receive a converted feedback signal from the target feedback signal conversion subunit currently in use between the first feedback signal conversion subunit and the second feedback signal conversion subunit; and if an abnormality is detected in the converted feedback signal, switch to another feedback signal conversion subunit as the target feedback signal conversion subunit currently in use.

4. The circuit of claim 3, wherein, The controller is further configured to: if it detects that the converted feedback signals sent by the first feedback signal conversion subunit and the second feedback signal conversion subunit are both abnormal, send a switching signal to the signal switching module to switch the target signal conversion module.

5. The circuit of claim 4, wherein, The first feedback signal conversion subunit includes a first signal receiving component, a first optocoupler, and a first signal conditioning component; The input terminal of the first signal receiving component is connected to the feedback output terminal of the motor, and the output terminal is connected to the input terminal of the first optocoupler. The output terminal of the first optocoupler is connected to the input terminal of the first signal conditioning component, and the output terminal of the first signal conditioning component is connected to the first feedback input terminal of the controller. The second feedback signal conversion subunit includes a second signal receiving component, a second optocoupler, and a second signal conditioning component; The input terminal of the second signal receiving component is connected to the feedback output terminal of the motor, and the output terminal is connected to the input terminal of the second optocoupler; The output terminal of the second optocoupler is connected to the input terminal of the second signal conditioning component, and the output terminal of the second signal conditioning component is connected to the second feedback input terminal of the controller.

6. The circuit of claim 1, wherein, The first signal conversion module includes a third signal receiving component, a third optocoupler, and a third signal conditioning component; The input terminal of the third signal receiving component is connected to the first drive signal output terminal of the control module, and the output terminal is connected to the input terminal of the third optocoupler. The output terminal of the third optocoupler is connected to the input terminal of the third signal conditioning component, and the output terminal of the third signal conditioning component is connected to the first input contact of the signal switching module. The second signal conversion module includes a fourth signal receiving component, a fourth optocoupler, and a fourth signal conditioning component; The input terminal of the fourth signal receiving component is connected to the second drive signal output terminal of the control module, and the output terminal is connected to the input terminal of the fourth optocoupler. The output terminal of the fourth optocoupler is connected to the input terminal of the fourth signal conditioning component, and the output terminal of the fourth signal conditioning component is connected to the second input contact of the signal switching module.

7. The circuit of claim 6, wherein, Both the third signal conditioning component and the fourth signal conditioning component include at least one set of signal conditioning devices, each set of signal conditioning devices includes two devices of the same type, and the two devices of the same type are connected together.

8. The circuit of claim 7, wherein, In the at least one group of signal conditioning devices, any group of signal conditioning devices of the type of resistors includes resistors connected in parallel, and any group of signal conditioning devices of the type of capacitors includes capacitors connected in series.

9. The circuit according to any of claims 1-8, characterized in that, The signal switching module includes a relay; The output terminal of the first signal conversion module is connected to the first input contact of the relay, the output terminal of the second signal conversion module is connected to the second input contact of the relay, and the output contact of the relay is connected to the motor drive device; The switching signal output terminal of the control module is connected to the first terminal of the electromagnetic coil of the relay, and the second terminal of the electromagnetic coil is connected to the preset level terminal.

10. An electrical appliance, characterized in that The electrical equipment includes: a motor, a motor drive device, and a motor drive signal switching circuit as described in any one of claims 1-9; The output contacts of the signal switching module included in the motor drive signal switching circuit are connected to the motor drive device. The output end of the motor drive device is connected to the motor. The feedback output terminal of the motor is connected to the feedback input terminal of the control module included in the motor drive signal switching circuit.

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