Circuit for signal transmission, control circuit and electric motor control system

Abstract

Provided are a circuit for signal transmission, a control circuit and an electric motor control system. The circuit for signal transmission may comprise: an output control circuit, which is used for acquiring a first pulse-width modulation (PWM) signal from a controller within a first time period, and for processing the first PWM signal into a first converted PWM signal, so as to transmit the first converted PWM signal to an apparatus side by means of a common wire; and an input control circuit, which is used for receiving a second PWM signal from the apparatus side by means of the common wire within a second time period, and for processing the second PWM signal into a second converted PWM signal, so as to transmit the second converted PWM signal to the controller, wherein the first time period does not overlap the second time period. The circuit for signal transmission can be used for reducing the number of wires for signal transmission.

Description

Circuits for signal transmission, control circuits, and motor control systems 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 motor vehicles, it is usually necessary to drive the motor so that the motor can rotate. The controller (such as an MCU) can provide a PWM drive signal to the motor through 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), which also requires additional wiring to feed back to the controller so that the controller can analyze the status 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] Typically, the controller outputs a PWM drive signal that is supplied to the motor. Simultaneously, a PWM speed measurement signal, generated by a speed sensor based on the motor's rotation, is supplied to the controller via a separate trace, as shown in Figure 1. This means that the PWM drive signal and PWM speed measurement signal are transmitted between the controller and the motor via two separate traces. While Figure 1 shows a direct connection between the motor and controller, separate circuits for processing the PWM drive signal and PWM speed measurement signal can be provided between them, ensuring that the two PWM signals meet the input signal requirements of the motor and controller, 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 merely an example, and there may be other situations where bidirectional transmission of PWM signals between two devices is required.

[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.

[0006] Summary of the Invention

[0007] 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.

[0008] 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.

[0009] 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, the level of the 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.

[0010] 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.

[0011] According to an embodiment of the present application, the circuit further includes: a second protection circuit, disposed between the output control circuit and the common wiring, for limiting the current magnitude of the current flowing out of the output control circuit.

[0012] 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.

[0013] 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 the switching control end of the first switching 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 the 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.

[0014] 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 switching control end of the second switching circuit and is 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.

[0015] 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 electric motor.

[0016] According to another aspect of the present application, a control circuit is also provided, comprising: a controller; and the circuit for signal transmission as described above, 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 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 converted PWM signal from the circuit.

[0017] 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 line, for providing a first conversion PWM signal to the motor side via the common line, and receiving the second PWM signal from the motor side via the common line.

[0018] According to another aspect of the present application, a domain controller is provided, comprising the circuit according to the present invention as described above.

[0019] 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.

[0020] 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, thereby eliminating the need to separately set up 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.

[0021] 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

[0022] The above and other purposes, features, and advantages of the present disclosure will become more apparent through a more detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings. The accompanying drawings are intended 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 are not intended to limit the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0023] FIG1 shows a schematic diagram of signal transmission between a controller and a motor according to an embodiment.

[0024] FIG2 shows a schematic structural diagram of a control system according to an embodiment of the present application, including a schematic diagram of a circuit for transmitting signals via a shared trace.

[0025] FIG3 shows a further schematic structural diagram of the circuit in FIG2 .

[0026] FIG. 4 shows a detailed circuit diagram of various parts of the circuit in FIG. 2 .

[0027] FIG5 shows a schematic diagram of a control circuit according to an embodiment of the present application.

[0028] FIG6 shows a schematic structural diagram of a motor vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of 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.

[0030] 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 achieved from a circuit functional perspective.

[0031] FIG2 shows a schematic structural diagram of a control system according to an embodiment of the present application, which includes a circuit for transmitting signals via a common trace.

[0032] The circuit 200 shown in FIG2 is used to transmit a first PWM signal (e.g., a PWM drive signal for driving a motor) from a controller via a shared wiring to a device (e.g., a motor and related devices controlled and driven based on the controller's signals, which may include multiple interfaces for inputting and outputting various signals). The circuit 200 receives a second PWM signal (e.g., a PWM speed measurement signal for the motor) from the device via the shared wiring and transmits the second PWM signal to the controller. The controller may be, for example, a microprocessor, a microcontroller unit (MCU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or any other integrated circuit with processing capabilities and capable of outputting control signals.

[0033] 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 circuit 200 from the controller is a PWM drive signal, and the second PWM signal PWM2 received by circuit 200 from the device side for input to the controller is a PWM speed measurement signal measured by the speed sensor and indicating the rotational speed of the motor. Of course, the device side may also include different devices in the motor control system that require PWM signals to control their operation or that can provide PWM signal feedback, and this application does not limit this.

[0034] As shown in FIG. 2 , the circuit 200 includes an output control circuit 210 and an input control circuit 220 .

[0035] The output control circuit 210 is configured to obtain a first pulse width modulation (PWM) signal PWM1 from the controller in a first time period, process the first PWM signal PWM1 into a first converted PWM signal SPWM-1, and provide the first converted PWM signal SPWM-1 to the device side via a shared bus.

[0036] The input control circuit 220 is configured to receive a second PWM signal PWM2 from the device via the shared line during a second time period, and process the second PWM signal PWM2 into a second converted PWM signal SPWM-2 to return to the controller.

[0037] Furthermore, as shown in FIG3 , the output control circuit 210 may include a first switching circuit SC1. A switch control terminal of the first switching circuit SC1 receives a first PWM signal PWM1 from a controller. A first terminal of the first switching circuit SC1 is connected to a first power terminal VP1 and a common trace. The voltage level of the voltage signal provided by the first power terminal is suitable for the device side. A second terminal of the first switching circuit SC1 is connected to a reference power terminal VREF. The first switching 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 switching circuit SC1.

[0038] 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 a common trace and receives a second PWM signal PWM2 from the device via the common trace. A first terminal of the second switch circuit SC2 is connected to a second power supply terminal VP2, which provides a voltage signal at a voltage level suitable for the controller. A second terminal of the second switch circuit SC2 is connected to a reference power supply terminal. The second switch circuit SC2 switches in response to the second PWM signal PWM2, thereby outputting a second conversion PWM signal SPWM-2 to the controller from a third terminal of the second switch circuit SC2.

[0039] As can be seen, the output control circuit and the input control circuit operate in a time-sharing manner. The output control circuit can convert a first PWM signal from the controller into a first converted PWM signal and provide it to the device via a shared bus. Furthermore, the input control circuit can receive a second PWM signal from the device via the shared bus and convert it into a second converted PWM signal to provide to the controller. This eliminates the need for separate routing for the first and second PWM signals, thereby reducing the number of routing lines. Furthermore, the first converted PWM signal provided to the device and the second converted PWM signal provided to the controller both have voltage levels suitable for the device and controller, respectively. Therefore, circuit 200 also implements signal conditioning.

[0040] Furthermore, in some embodiments, the circuit 200 may be integrated and packaged together. In this case, the circuit 200 only needs to have one input / output port for the first PWM signal and the second PWM signal. This input / output port can be connected to the shared bus, so that the output control circuit 210 outputs the first converted PWM signal SPWM-1 through this input / output port, and the input control circuit 220 receives the second PWM signal PWM2 through this input / output port. In this case, reducing the number of input / output ports can also reduce costs and layout complexity.

[0041] In addition, the device side can receive and send signals via the shared 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.

[0042] Optionally, as an example, the specific circuits of each circuit part in the circuit described with reference to FIG. 2-FIG . 3 are described below in conjunction with FIG. 4 .

[0043] 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 .

[0044] The first end of the first resistor R1 serves as the switch control terminal of the first switching 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, the first end of the first capacitor, and the control terminal of the first transistor T1. The second end of the second resistor R2, the second end of the first capacitor, and the second terminal of the first transistor T1 are connected to the reference voltage terminal. The second terminal of the first transistor T1 serves as the second terminal of the first switching circuit SC1. The first terminal of the first transistor T1 serves as the first terminal of the first switching circuit SC1 and is connected to the first power supply terminal.

[0045] For example, the first power supply terminal can be the output terminal of a battery, and the voltage level of the DC voltage signal provided is relatively high (high level), for example, it can be 18V, so that the voltage amplitude of the first conversion PWM signal output by the output control circuit is relatively large, thereby having a stronger driving capability. The reference voltage terminal can be, for example, a ground terminal or other power supply terminal that provides a relatively low DC voltage (low level). Optionally, the first transistor and other transistors to be described later can all be selected from various types of transistors commonly used in the art, and this application does not impose any restrictions on this. Figure 4 shows that the first transistor is an NPN transistor.

[0046] The second switch circuit SC2 includes a second transistor T2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5.

[0047] The first end of the third resistor R3 serves as the switch control terminal of the second switching circuit SC2 and is connected to the common trace. The second end of the third resistor R3 is connected to the control terminal of the second transistor T2 and the second end of the fourth resistor R4. The first end of the fourth resistor R4 serves as the first end of the second switching circuit SC2 and is connected to the second power supply terminal. The second end of the second transistor T2 serves as the third end of the second switching circuit SC2 and is connected to the first end of the fifth resistor R5 and the PWM signal input pin of the controller. The second end of the fifth resistor R5 serves as the second end of the second switching circuit SC2 and is connected to the reference voltage terminal.

[0048] The voltage level of the DC voltage signal provided by the second power supply terminal needs to meet the level requirement of the controller's input signal, so the voltage level is generally relatively low, such as 5V or 3.2V, etc. FIG4 shows that the second transistor T2 is a PNP transistor.

[0049] The working process of the output control circuit and the input control circuit in FIG4 is described below.

[0050] During the first time period, the output control circuit 210 needs to output a first conversion PWM signal based on the first PWM signal PWM1 from the controller, and transmit it to the device side via the circuit 200. Referring to Figure 4 , when the first PWM signal is high, the first transistor T1 turns on, thereby pulling the voltage at the first electrode of the first transistor T1 down to a low level, causing the first conversion PWM signal SPWM-1 to also be low. It should be noted that although the second transistor T2 in the input control circuit turns on based on the low level of the first conversion SPWM-1, causing the second electrode of the second transistor T2 to output a high-level signal (the voltage level of the DC voltage signal provided by the second power supply terminal), the PWM input port is internally closed in the controller during the first time period, so no signal is input to the controller from this PWM input pin during this period. When the first PWM signal PWM1 is low, the first transistor T1 turns off, causing the voltage at the first electrode of the first transistor T1 to be provided by the voltage signal from the first power supply terminal, causing the first conversion PWM signal SPWM-1 to be high.

[0051] Therefore, the first conversion PWM signal SPWM-1 output by the output control circuit switches in sync with the first PWM signal. This means that both have the same switching frequency and duty cycle, and their phases can be the same or 180 degrees apart, depending on the control method and transistor type. Therefore, during the first time period, the first conversion PWM signal can be transmitted to the device via the shared trace.

[0052] On the other hand, during the second time period, the input control circuit 220 needs to receive the second PWM signal PWM2 via the shared wiring and convert the second PWM signal into a second conversion PWM signal for input into the controller. Referring to FIG4 , 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. At this time, the controller can default the voltage of the second conversion PWM signal to a low level. It should be noted that at this time, the first transistor T1 in the output control circuit will not be turned on due to the lack of the first PWM signal driving it. Therefore, the first electrode of the first transistor T1 is at a high level (related to the voltage level of the DC voltage signal provided by the first power supply terminal). The high level of the voltage signal in both directions is coupled to the control electrode of the second transistor, causing the second transistor T2 to be non-conductive. When the level of the second PWM signal is low, the voltage at the control electrode of the second transistor is low, and due to the voltage dividing 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 is able to 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.

[0053] Therefore, the second converted PWM signal SPWM-2 output by the input control circuit switches in sync with the switching of the second PWM signal. This means that the two signals have the same switching frequency and duty cycle, and their phases can be the same or 180° apart, depending on the control method and transistor type. Therefore, during the second time period, the second PWM signal received from the device via the shared trace is converted into a second converted PWM signal and transmitted to the controller.

[0054] Optionally, in order to make the circuit more functional and reliable, the circuit may further include other circuit parts.

[0055] Continuing with FIG. 4 , based on the circuit structure shown in FIG. 2 , circuit 200 may further include a first protection circuit P1. The first protection circuit P1 is disposed between the first power supply terminal and the first terminal of the output control circuit and is configured to limit the direction and magnitude of current flowing from the first power supply terminal. For example, when the first transistor T1 is on, the current flowing from the first power supply terminal to the reference power supply terminal is limited. When the first transistor T1 is off, the current flowing from the first power supply terminal to the shared trace and / or the second switching circuit SC2 is limited. Furthermore, the first protection circuit P1 is configured to limit the direction of current flow to prevent reverse current flow into the first power supply terminal, such as during the second time period. Optionally, the first protection circuit may include a current-limiting resistor and a diode.

[0056] Optionally, circuit 200 may further include a second protection circuit P2, disposed between the output control circuit and the common wiring (e.g., between the first electrode of the first transistor and the common wiring), configured to limit 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 to prevent current from flowing from the common wiring to the first switching circuit or the first power supply terminal.

[0057] Optionally, the circuit 200 may further include a third protection circuit P3, which is provided between the common trace 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.

[0058] As can be seen, by setting up various protection circuits, the current in each path of the circuit can be limited to a reasonable range and reverse current flow can be prevented. In addition, electrostatic protection is also designed to further improve the reliability of the circuit.

[0059] According to another aspect of the present application, a control circuit is also provided.

[0060] FIG5 shows a schematic structural diagram of a control circuit according to an embodiment of the present application.

[0061] As shown in Figure 5, the control circuit 500 may include a controller and a circuit for transmitting signals via a common trace, wherein the circuit for transmitting signals via a common trace may be the circuit 200 described above with reference to Figures 2-4 and connected to the PWM signal input pin and the PWM signal output pin of the controller.

[0062] As described above, the output control circuit and the input control circuit in the circuit 200 operate in a time-sharing manner to output the first PWM signal and input the second PWM signal in a time-sharing manner. Therefore, 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 converted PWM signal from the circuit.

[0063] The control circuit 500 can be an integrated circuit having an input / output port for connecting to a common trace, 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 (for example, a motor) via the input / output port and the common trace, 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 trace, 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.

[0064] In this way, the number of ports at the control circuit 500 can be reduced, thereby reducing costs and reducing layout complexity.

[0065] A domain controller (or regional controller) is the core of each functional domain in a vehicle. It primarily consists of three components: a domain master processor, an operating system, and application software and algorithms. Leveraging its high-performance domain master processor, extensive hardware interface resources, and robust software features, the domain controller can integrate core functions that would otherwise require multiple ECUs, significantly improving system integration. Furthermore, standardized data exchange interfaces significantly reduce development and manufacturing costs. The circuit described in this article can be applied to domain controllers or regional controllers.

[0066] According to another aspect of the present application, a motor vehicle is also provided.

[0067] FIG6 shows a schematic structural diagram of a motor vehicle according to an embodiment of the present application.

[0068] As shown in FIG6 , a 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. A detailed description of the motor vehicle 600 according to the present application can be found in the description of FIG2 through FIG5 in this application, and for the sake of brevity, a detailed description thereof will not be repeated here.

[0069] Although the present invention has been described in detail with respect to various specific example embodiments thereof, each example is provided by way of explanation rather than limitation of the present invention. Those skilled in the art, upon obtaining an understanding of the foregoing, can readily make variations, changes, and equivalents of such embodiments. Therefore, the present invention does not exclude the inclusion of such modifications, changes, and / or additions to the present invention that would be apparent to those of ordinary skill in the art. For example, a feature illustrated or described as part of one embodiment may be used in conjunction with another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention cover such variations, changes, and equivalents.

[0070] Specifically, although the figures of the present disclosure describe steps performed in a specific order for the purposes 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.

[0071] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this 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 art and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0072] The above is an illustration of the present disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of the present disclosure have been 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 by the claims. It should be understood that the above is an illustration of the present disclosure and should not be considered as 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 the 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. Used to limit the current direction and current magnitude of the current flowing out of the first power supply end.

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: The 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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