Circuit for signal transmission, control circuit and motor control system

Abstract

The invention provides a circuit for signal transmission, a control circuit and a motor control system. The circuit may include: an output control circuit for acquiring a first pulse width modulation (PWM) signal from a controller during a first period of time, and processing the first PWM signal into a first converted PWM signal to transfer the first converted PWM signal to a device side via a common trace; the input control circuit is used for receiving a second PWM signal from the device side through the common wire in a second time period and processing the second PWM signal into a second converted PWM signal to be transmitted to the controller, and the first time period and the second time period are not overlapped. The circuit can be used for reducing the number of wires used for signal transmission.

Description

Technical Field

[0001] The present application relates to the field of circuits, and more particularly, to a circuit for signal transmission between a controller and a device, a control circuit, and a motor control system. Background Art

[0002] In a motor vehicle, it is usually necessary to drive the motor so that the motor can rotate, and the controller (such as MCU) can provide a PWM drive signal to the motor through the wiring. In addition, during the operation of the motor, it is usually necessary to measure the speed of the motor. For example, a speed sensor such as a Hall sensor can generate a PWM speed measurement signal (related to the speed of the motor), so another wiring is also required to feedback to the controller, so that the controller can analyze the state of the motor. In this application, the motor and its related devices (such as speed sensors, etc.) are referred to as the motor side.

[0003] Usually, the PWM drive signal output by the controller is provided to the motor. At the same time, the PWM speed measurement signal measured by the speed sensor for the rotation of the motor is provided to the controller through another wiring, such as Figure 1 As shown, the PWM drive signal and the PWM speed measurement signal are transmitted between the controller and the motor side via two different wires. Figure 1 Although it is shown that the motor side and the controller are directly connected, circuits for processing the PWM drive signal and the PWM speed measurement signal respectively can be set between the two, so that the two PWM signals can meet the requirements of the motor side and the controller for the input signal respectively.

[0004] It should be noted that the above description uses the motor in a motor vehicle as an example to illustrate the need for bidirectional transmission of PWM signals, but this is only an example, and there may be other situations where bidirectional transmission of PWM signals is required between two devices.

[0005] However, too many traces may make the circuit layout more complicated and the cost higher, so a solution that can reduce the number of traces is needed. Summary of the invention

[0006] According to one aspect of the present application, a circuit for signal transmission is provided, comprising: an output control circuit for acquiring a first pulse width modulation (PWM) signal from a controller in a first time period, and processing the first PWM signal into a first conversion PWM signal to transmit the first conversion PWM signal to a device side via a common wiring; and an input control circuit for receiving a second PWM signal from the device side via the common wiring in a second time period, and processing the second PWM signal into a second conversion PWM signal to transmit to the controller, wherein the first time period does not overlap with the second time period.

[0007] According to an embodiment of the present application, the output control circuit includes a first switching circuit, a switch control end of the first switching circuit obtains the first PWM signal from the controller, a first end of the first switching circuit is connected to a first power supply end and the common wiring, and a second end of the first switching circuit is connected to a reference power supply end, wherein the first switching circuit switches in response to the first PWM signal, thereby outputting the first conversion PWM signal from the first end of the first switching circuit.

[0008] According to an embodiment of the present application, the input control circuit includes a second switching circuit, a switch control end of the second switching circuit is connected to the common wiring, and receives a second PWM signal from the device side via the common wiring, a first end of the second switching circuit is connected to a second power supply end, a level of a voltage signal provided by the second power supply end is suitable for the controller, and a second end of the second switching circuit is connected to a reference power supply end, wherein the second switching circuit switches in response to the second PWM signal, thereby outputting the second conversion PWM signal from the third end of the second switching circuit to the controller.

[0009] According to an embodiment of the present application, the circuit further includes: a first protection circuit, which is arranged between the first power supply terminal and the output control circuit and is used to limit the current direction and current magnitude of the current flowing out of the first power supply terminal.

[0010] According to an embodiment of the present application, the circuit further includes: a second protection circuit, which is arranged between the output control circuit and the common wiring, and is used to limit the current size of the current flowing out of the output control circuit.

[0011] According to an embodiment of the present application, the circuit further includes: a third protection circuit, arranged between the common wiring and the reference power supply terminal, for electrostatic protection.

[0012] According to an embodiment of the present application, the first switching circuit includes a first transistor, a first resistor, a second resistor and a first capacitor, the first end of the first resistor serves as a switch control end of the first switching circuit and is connected to a PWM signal output pin of the controller, the second end of the first resistor is connected to the first end of the second resistor and the first end of the first capacitor, and to the control electrode of the first transistor, the second end of the second resistor, the second end of the first capacitor and the second electrode of the first transistor are connected to a reference voltage end, the second electrode of the first transistor serves as the second end of the first switching circuit; and the first electrode of the first transistor serves as the first end of the first switching circuit and is connected to the first power supply end.

[0013] According to an embodiment of the present application, the second switching circuit includes a second transistor, a third resistor, a fourth resistor and a fifth resistor, the first end of the third resistor serves as the switch control end of the second switching circuit, connected to the common wiring, and the second end of the third resistor is connected to the control electrode of the second transistor and the second end of the fourth resistor, the first end of the fourth resistor serves as the first end of the second switching circuit and is connected to the second power supply end, and the second electrode of the second transistor serves as the third end of the second switching circuit and is connected to the first end of the fifth resistor and the PWM signal input pin of the controller, and the second end of the fifth resistor serves as the second end of the second switching circuit and is connected to the reference voltage end.

[0014] According to an embodiment of the present application, the device side includes an electric motor and a speed sensor for the electric motor, and the first PWM signal is a pulse width modulation (PWM) drive signal provided from the controller to the electric motor, and the second PWM signal is a PWM speed measurement signal measured by the speed sensor and indicating the rotational speed of the motor.

[0015] According to another aspect of the present application, a control circuit is also provided, comprising: a controller; and a circuit for signal transmission according to the above, connected to a PWM signal input pin and a PWM signal output pin of the controller, wherein, during the first time period, the PWM signal input pin is closed, and the PWM signal output pin is enabled, so that the controller provides the first PWM signal to the circuit; and during the second time period, the PWM signal output pin is closed, and the PWM signal input pin is enabled, so that the controller receives the second conversion PWM signal from the circuit.

[0016] According to another aspect of the present application, a motor control system is also provided, including: a motor side; a controller; and a circuit for signal transmission as described above, connected to the motor side via a common wiring, for providing a first conversion PWM signal to the motor side via the common wiring, and receiving the second PWM signal from the motor side via the common wiring.

[0017] According to another aspect of the present application, a domain controller is further provided, comprising the circuit according to the present invention as described above.

[0018] According to another aspect of the present application, a motor vehicle is also provided, comprising: the circuit according to the present invention as described above; and / or the control circuit according to the present invention as described above; and / or the motor control system according to the present invention as described above.

[0019] According to the circuit, control circuit, motor control system and motor vehicle for signal transmission of the present application, a first PWM signal provided by a controller can be transmitted to a first device via a shared bus during different time periods, and a second PWM signal can be received from a second device (the same device as the first device or a different device) and transmitted to the controller, so there is no need to separately set a wiring for transmitting the first PWM signal and a wiring for transmitting the second PWM signal. Therefore, for the device side, the number of wirings used for signal transmission between the device side and the controller can be reduced, thereby reducing costs. For the control circuit side, only one port connected to the shared wiring can be set to realize input and output functions, which can also facilitate layout and reduce costs. In addition, the circuit can also adjust the PWM signal output by the controller and the PWM signal to be input to the controller to meet different signal input requirements. In addition, various protection circuits are also provided to make the circuit safer and more reliable.

[0020] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0022] Figure 1 A schematic diagram of signal transmission between a controller and a motor side according to an embodiment is shown.

[0023] Figure 2 A schematic structural diagram of a control system according to an embodiment of the present application is shown, including a schematic diagram of a circuit for transmitting signals via a common wiring.

[0024] Figure 3 Shows Figure 2 Further schematic structural diagram of the circuit in .

[0025] Figure 4 Shows Figure 2 Specific circuit diagrams of the various parts of the circuit.

[0026] Figure 5 A schematic diagram of a control circuit according to an embodiment of the present application is shown.

[0027] Figure 6 A schematic diagram of a motor vehicle according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] In the present application, description about a first element being connected to a second element may indicate that the first element and the second element are directly connected or indirectly connected via one or more third elements, as long as it can be realized from a circuit functional point of view.

[0030] Figure 2 A schematic structural diagram of a control system according to an embodiment of the present application is shown, which includes a circuit for transmitting signals via a common wiring.

[0031] Figure 2 The circuit 200 shown is used to transmit a first PWM signal (e.g., a PWM drive signal for driving a motor) from a controller to a device side (e.g., a motor and related devices for controlling and driving based on the signal of the controller, which may include multiple interfaces for inputting and outputting various signals) via a shared line, and receive a second PWM signal (e.g., a PWM speed measurement signal of the motor) from the device side via the shared line to transmit the second PWM signal to the controller. The controller may be, for example, a microprocessor, a microcontroller unit (MCU), a digital controller (DSP), an application specific integrated circuit (ASIC), or any integrated circuit having processing capabilities and capable of outputting control signals, etc.

[0032] For example, the control system may be a motor control system, in which case the device side includes a motor and a speed sensor for the motor. Thus, the first PWM signal PWM1 received by the circuit 200 from the controller is a PWM drive signal, and the second PWM signal PWM2 received by the circuit 200 from the device side for input to the controller is a PWM speed measurement signal indicating the rotation speed of the motor measured by the speed sensor. Of course, the device side may also include different devices in the motor control system that require PWM signals to control their operation or can provide PWM signal feedback, and this application does not limit this.

[0033] like Figure 2 As shown, the circuit 200 includes an output control circuit 210 and an input control circuit 220 .

[0034] The output control circuit 210 is used to obtain a first pulse width modulation (PWM) signal PWM1 from the controller in a first time period, and process the first PWM signal PWM1 into a first conversion PWM signal SPWM-1, so as to provide the first conversion PWM signal SPWM-1 to the device side via a common bus.

[0035] The input control circuit 220 is used to receive the second PWM signal PWM2 from the device side via the common line in the second time period, and process the second PWM signal PWM2 into a second conversion PWM signal SPWM-2 to return to the controller. The first time period does not overlap with the second time period.

[0036] Furthermore, if Figure 3 As shown, the output control circuit 210 may include a first switch circuit SC1, a switch control terminal of the first switch circuit SC1 obtains a first PWM signal PWM1 from a controller, a first terminal of the first switch circuit SC1 is connected to a first power terminal VP1 and a common wiring, a voltage level of a voltage signal provided by the first power terminal is suitable for the device side, and a second terminal of the first switch circuit SC1 is connected to a reference power terminal VREF. The first switch circuit SC1 switches in response to the first PWM signal PWM1, thereby outputting a first conversion PWM signal SPWM-1 from the first terminal of the first switch circuit SC1.

[0037] The input control circuit 220 may include a second switch circuit SC2, a switch control terminal of the second switch circuit SC2 is connected to the common wiring, and receives the second PWM signal PWM2 from the device side via the common wiring, a first terminal of the second switch circuit SC2 is connected to the second power terminal VP2, a voltage level of the voltage signal provided by the second power terminal is suitable for the controller, and a second terminal of the second switch circuit SC2 is connected to the reference power terminal. The second switch circuit SC2 switches in response to the second PWM signal PWM2, thereby outputting the second conversion PWM signal SPWM-2 to the controller from the third terminal of the second switch circuit SC2.

[0038] It can be seen that the output control circuit and the input control circuit work in time-sharing mode. The output control circuit can convert the first PWM signal from the controller into a first conversion PWM signal and provide it to the device side via a shared bus, and the input control circuit can receive the second PWM signal from the device side via the shared bus and convert it into a second conversion PWM signal to provide it to the controller, so there is no need to set two wires for transmitting the first PWM signal and the second PWM signal respectively, thus reducing the number of wires. In addition, the first conversion PWM signal provided to the device side and the second conversion PWM signal provided to the controller both have levels suitable for the device side and the controller respectively, so the circuit 200 also realizes the signal adjustment process.

[0039] In addition, in some embodiments, the circuit 200 may be integrated and packaged together. In this case, the circuit 200 only needs to set one input / output port for the first PWM signal and the second PWM signal, and the input / output port may be connected to the shared bus, so that the output control circuit 210 outputs the first conversion PWM signal SPWM-1 through the input / output port, and the input control circuit 220 receives the second PWM signal PWM2 through the input / output port. In this case, the reduction in the number of input / output ports can also reduce costs and layout complexity.

[0040] In addition, the device side can receive and send signals via the common line, so timing control is also set for the device side to receive the first conversion PWM signal SPWM-1 during the first time period and output the second PWM signal PWM2 during the second time period.

[0041] Optionally, as an example, the following combination Figure 4 For reference Figure 2-Figure 3 The specific circuit of each circuit part in the described circuit is described.

[0042] More specifically, the first switch circuit SC1 includes a first transistor T1, a first resistor R1, a second resistor R2 and a first capacitor C1.

[0043] The first end of the first resistor R1 serves as the switch control end of the first switch circuit SC1 and is connected to the PWM signal output pin of the controller. The second end of the first resistor R1 is connected to the first end of the second resistor R2 and the first end of the first capacitor, and is connected to the control electrode of the first transistor T1. The second end of the second resistor R2, the second end of the first capacitor and the second electrode of the first transistor T1 are connected to the reference voltage end, and the second electrode of the first transistor T1 serves as the second end of the first switch circuit SC1. The first electrode of the first transistor T1 serves as the first end of the first switch circuit SC1 and is connected to the first power supply end.

[0044] For example, the first power supply terminal may be an output terminal of a battery, and the voltage level of the DC voltage signal provided is relatively high (high level), for example, 18V, so that the voltage amplitude of the first conversion PWM signal output by the output control circuit is relatively large, so that it can have a stronger driving capability. The reference voltage terminal may be, for example, a ground terminal or other power supply terminal providing a relatively low DC voltage (low level). Optionally, the first transistor and other transistors to be described later may all be selected from various types of transistors commonly used in the art, and the present application does not limit this. Figure 4 The first transistor is shown as an NPN transistor.

[0045] The second switch circuit SC2 includes a second transistor T2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5.

[0046] The first end of the third resistor R3 is connected to the common wiring as the switch control end of the second switch circuit SC2, and the second end of the third resistor R3 is connected to the control electrode of the second transistor T2 and the second end of the fourth resistor R4. The first end of the fourth resistor R4 is connected to the second power supply end as the first end of the second switch circuit SC2, and the second electrode of the second transistor T2 is connected to the first end of the fifth resistor R5 and the PWM signal input pin of the controller as the third end of the second switch circuit SC2. The second end of the fifth resistor R5 is connected to the reference voltage end as the second end of the second switch circuit SC2.

[0047] The voltage level of the DC voltage signal provided by the second power supply terminal needs to meet the level requirement of the input signal of the controller, because the voltage level is generally small, such as 5V or 3.2V. Figure 4 The second transistor T2 is shown as a PNP transistor.

[0048] The following Figure 4 The working process of the output control circuit and input control circuit is described in the following.

[0049] During the first time period, the output control circuit 210 needs to output the first conversion PWM signal according to the first PWM signal PWM1 from the controller, and transmit it to the device side through the circuit 200. Figure 4 , when the level of the first PWM signal is high, the first transistor T1 is turned on, thereby pulling the voltage of the first electrode of the first transistor T1 down to a low level, so that the first conversion PWM signal SPWM-1 is also low. It should be noted that although the second transistor T2 in the input control circuit is turned on based on the low-level first conversion SPWM-1, so that the second electrode of the second transistor T2 will output a high-level (the voltage level of the DC voltage signal provided by the second power supply terminal) signal, but since the PWM input port is closed inside the controller during the first time period, the PWM input pin will not input any signal to the controller during this period. When the level of the first PWM signal PWM1 is low, the first transistor T1 is turned off, so that the voltage at the first electrode of the first transistor T1 is provided by the voltage signal of the first power supply terminal, so that the first conversion PWM signal SPWM-1 is high.

[0050] Therefore, the first conversion PWM signal SPWM-1 output by the output control circuit switches with the switching of the first PWM signal, that is, the two have the same switching frequency and duty cycle, and the phases can be the same or 180 degrees different according to the control method and the type of transistor. Therefore, during the first time period, the first conversion PWM signal can be transmitted to the device side via the common wiring.

[0051] On the other hand, during the second time period, the input control circuit 220 needs to receive the second PWM signal PWM2 via the common line and convert the second PWM signal into a second conversion PWM signal to be input into the controller. Figure 4 , when the level of the second PWM signal is high, the second transistor T2 is turned off, so that the second electrode of the second transistor T2 does not return a signal to the controller, and the controller can assume that the voltage of the second conversion PWM signal is low. It should be noted that at this time, the first transistor T1 in the output control circuit will not be turned on because it is not driven by the first PWM signal, so the first electrode of the first transistor T1 is high (related to the voltage level of the DC voltage signal provided by the first power supply terminal), and the high level of the voltage signal in both directions is coupled to the control electrode of the second transistor, so that the second transistor T2 is not turned on. When the level of the second PWM signal is low, the voltage of the control electrode of the second transistor is low, and due to the voltage division effect of the third resistor and the fourth resistor, the voltage value between the first electrode and the control electrode of the second transistor T2 can turn on the second transistor T2, so that the voltage at the second electrode of the second transistor T2 is pulled up to the high level of the second power supply terminal, so that the second conversion PWM signal SPWM-1 is high.

[0052] Therefore, the second conversion PWM signal SPWM-2 output by the input control circuit switches along with the switching of the second PWM signal, that is, the two have the same switching frequency and duty cycle, and the phases can be the same or 180° different according to the control method and the type of transistor. Therefore, during the second time period, the second PWM signal received from the device side via the common wiring is converted into the second conversion PWM signal and then transmitted to the controller.

[0053] Optionally, in order to make the circuit function more complete and the circuit more reliable, the circuit may further include other circuit parts.

[0054] Continue as Figure 4 As shown, in Figure 2Based on the circuit structure shown, the circuit 200 may further include a first protection circuit P1, which is arranged between the first power supply terminal and the first terminal of the output control circuit, and is used to limit the current direction and current magnitude of the current flowing out of the first power supply terminal, for example, when the first transistor T1 is turned on, the current flowing from the first power supply terminal to the reference power supply terminal is limited, and when the first transistor T1 is turned off, the current flowing from the first power supply terminal to the common wiring and / or the second switch circuit SC2 is limited. At the same time, the first protection circuit P1 is also used to limit the current direction to prevent the current from flowing in the reverse direction into the first power supply terminal, for example, during the second time period. Optionally, the first protection circuit may include a current limiting resistor and a diode.

[0055] Optionally, the circuit 200 may further include a second protection circuit P2, which is arranged between the output control circuit and the common wiring (for example, between the first electrode of the first transistor and the common wiring), and is used to limit the current size of the current flowing out of the output control circuit. Optionally, the second protection circuit may include a current limiting resistor. Optionally, the second protection circuit may also include a diode, thereby also preventing current from flowing from the common wiring to the first switch circuit or the first power supply terminal.

[0056] Optionally, the circuit 200 may further include a third protection circuit P3, which is arranged between the common wiring and the reference power supply terminal for electrostatic protection. Optionally, the third protection circuit may include a TVS diode array or a variable resistor and / or a capacitor connected in parallel therewith.

[0057] It can be seen that by setting various protection circuits, the current on each path in the circuit can be limited to a reasonable range and the current can be prevented from flowing in the reverse direction. In addition, electrostatic protection is also designed to further improve the reliability of the circuit.

[0058] According to another aspect of the present application, a control circuit is also provided.

[0059] Figure 5 A schematic structural diagram of a control circuit according to an embodiment of the present application is shown.

[0060] like Figure 5 As shown, the control circuit 500 may include a controller and a circuit for transmitting a signal via a common wiring, wherein the circuit for transmitting a signal via a common wiring may be as described above with reference to Figure 2-4 The described circuit 200 is connected to the PWM signal input pin and the PWM signal output pin of the controller.

[0061] As described above, the output control circuit and the input control circuit in the circuit 200 work in time-sharing mode to output the first PWM signal and input the second PWM signal in time-sharing mode, so that during the first time period, the PWM signal input pin of the controller is turned off, and the PWM signal output pin is enabled, so that the controller provides the first PWM signal to the circuit; and during the second time period, the PWM signal output pin of the controller is turned off, and the PWM signal input pin is enabled, so that the controller receives the second conversion PWM signal from the circuit.

[0062] The control circuit 500 can be an integrated circuit having an input / output port for connecting to a common wiring, so that the output control circuit in the circuit 200 can provide a first converted PWM signal (associated with the first PWM signal provided by the PWM signal output pin of the controller) to the device side (e.g., a motor) via the input / output port and the common wiring, and the input control circuit in the circuit 200 can receive a second PWM signal from the device side via the input / output port and the common wiring, and convert it to obtain a second converted PWM signal (associated with the first PWM signal provided by the controller) to provide to the PWM signal input pin of the controller.

[0063] In this way, the number of ports at the control circuit 500 can be reduced, thereby reducing costs and layout complexity.

[0064] The domain controller or regional controller is the core of each functional domain of the car. It is mainly composed of three parts: domain master processor, operating system, and application software and algorithms. Relying on high-performance domain master processor, rich hardware interface resources and powerful software functional characteristics, the domain controller can integrate the core functions that originally require many automotive control units ECU to implement, greatly improving the system function integration, coupled with the standardized interface for data interaction, it can greatly reduce the development and manufacturing costs of this part. The circuit described in this article can be used in a domain controller or regional controller.

[0065] According to another aspect of the present application, a motor vehicle is also provided.

[0066] Figure 6 A schematic structural diagram of a motor vehicle according to an embodiment of the present application is shown.

[0067] like Figure 6 As shown, the motor vehicle 600 according to the present application includes: the circuit 200 according to the present invention as described above; and / or the control circuit 500 according to the present invention as described above; and / or the motor control system according to the present invention as described above. The detailed description of the motor vehicle 600 according to the present application can be referred to in the present application for Figures 2 to 5 The descriptions made are not repeated here for the sake of brevity.

[0068] Although the subject matter has been described in detail for various specific example embodiments of the subject matter, each example is provided by way of explanation rather than limitation of the present disclosure. Those skilled in the art, after obtaining an understanding of the foregoing, can easily make changes, variations, and equivalents to such embodiments. Therefore, the present invention does not exclude including such modifications, variations, and / or additions to the subject matter that would be apparent to those of ordinary skill in the art. For example, a feature illustrated or described as part of one embodiment can be used together with another embodiment to produce yet another embodiment. Therefore, it is intended that the present disclosure covers such changes, variations, and equivalents.

[0069] Specifically, although the drawings of the present disclosure describe steps performed in a specific order for the purpose of illustration and discussion, the method of the present disclosure is not limited to the order or arrangement of the specific illustrations. The various steps of the above method can be omitted, rearranged, combined and / or adjusted in various ways without departing from the scope of the present disclosure.

[0070] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0071] The above is an explanation of the present disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of the present disclosure are described, it will be readily understood by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined in the claims. It should be understood that the above is an explanation of the present disclosure and should not be considered to be limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. A circuit for signal transmission, comprising: an output control circuit, configured to obtain a first pulse width modulation (PWM) signal from a controller in a first time period, and process the first PWM signal into a first conversion PWM signal, so as to transmit the first conversion PWM signal to a device side via a common wiring; and an input control circuit, configured to receive a second PWM signal from the device side via the common wiring in a second time period, and process the second PWM signal into a second converted PWM signal to be transmitted to the controller, The first time period does not overlap with the second time period.

2. The circuit according to claim 1, wherein The output control circuit comprises a first switch circuit, The switch control terminal of the first switch circuit obtains the first PWM signal from the controller, the first terminal of the first switch circuit is connected to the first power terminal and the common wiring, and the second terminal of the first switch circuit is connected to the reference power terminal, The first switch circuit switches in response to the first PWM signal, thereby outputting the first conversion PWM signal from a first end of the first switch circuit.

3. The circuit according to claim 1, wherein: The input control circuit includes a second switch circuit, The switch control terminal of the second switch circuit is connected to the common wiring and receives a second PWM signal from the device side via the common wiring, the first terminal of the second switch circuit is connected to a second power supply terminal, the level of the voltage signal provided by the second power supply terminal is suitable for the controller, and the second terminal of the second switch circuit is connected to a reference power supply terminal. The second switch circuit switches in response to the second PWM signal, thereby outputting the second conversion PWM signal from a third terminal of the second switch circuit to the controller.

4. The circuit according to claim 1, further comprising: The first protection circuit, The first protection circuit is arranged between the first power supply terminal and the output control circuit, and is used to limit the current direction and current magnitude of the current flowing out of the first power supply terminal.

5. The circuit according to any one of claims 1, further comprising: The second protection circuit is arranged between the output control circuit and the common wiring, and is used to limit the current magnitude of the current flowing out of the output control circuit.

6. The circuit according to claim 1, further comprising: A third protection circuit is arranged between the common wiring and the reference power supply terminal and is used for electrostatic protection.

7. The circuit according to claim 2, wherein: The first switch circuit includes a first transistor, a first resistor, a second resistor and a first capacitor. The first end of the first resistor is used as the switch control end of the first switch circuit and is connected to the PWM signal output pin of the controller. The second end of the first resistor is connected to the first end of the second resistor and the first end of the first capacitor, and is connected to the control electrode of the first transistor. The second end of the second resistor, the second end of the first capacitor and the second electrode of the first transistor are connected to a reference voltage terminal, and the second electrode of the first transistor serves as the second end of the first switch circuit; and The first electrode of the first transistor is connected to the first power supply terminal as the first end of the first switch circuit.

8. The circuit according to claim 3, wherein: The second switch circuit includes a second transistor, a third resistor, a fourth resistor and a fifth resistor, The first end of the third resistor is connected to the common wiring as the switch control end of the second switch circuit, and the second end of the third resistor is connected to the control electrode of the second transistor and the second end of the fourth resistor, the first end of the fourth resistor is connected to the second power supply end as the first end of the second switch circuit, and the second electrode of the second transistor is connected to the first end of the fifth resistor and the PWM signal input pin of the controller as the third end of the second switch circuit. The second end of the fifth resistor is connected to the reference voltage end as the second end of the second switch circuit.

9. The circuit of claim 1, wherein the device side includes a motor and a speed sensor for the motor, and The first PWM signal includes a pulse width modulation (PWM) driving signal provided from the controller to the motor, and the second PWM signal includes a PWM speed measurement signal indicating a rotation speed of the motor measured by the speed sensor.

10. A domain controller comprising the circuit according to any one of claims 1 to 9.

11. A control circuit comprising: Controller; as well as The circuit according to any one of claims 1 to 9, connected to the PWM signal input pin and the PWM signal output pin of the controller, wherein: During the first time period, the PWM signal input pin is turned off, and the PWM signal output pin is enabled, so that the controller provides the first PWM signal to the circuit; and During the second time period, the PWM signal output pin is turned off, and the PWM signal input pin is enabled, so that the controller receives the second switching PWM signal from the circuit.

12. A motor control system, comprising: Motor side; Controller; as well as The circuit according to any one of claims 1 to 9 is connected to the motor side via a common wiring, and is used to provide a first conversion PWM signal to the motor side via the common wiring, and receive the second PWM signal from the motor side via the common wiring.

13. A motor vehicle comprising A circuit according to any one of claims 1 to 9; and / or The domain controller according to claim 10; and / or The control circuit according to claim 11; and / or The motor control system according to claim 12.

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