Circuit for signal transmission, control circuit and motor control system

Abstract

Provided are a circuit for signal transmission, a control circuit, and a motor control system. The circuit is used for transmitting a power supply signal to a device side via a shared wiring, and receiving a pulse width modulation (PWM) signal from the device side via the shared wiring, so as to transmit the PWM signal to a controller. The circuit comprises: a first sub-circuit, used for, on the basis of a source power supply signal and a first conversion PWM signal, obtaining a second conversion PWM signal and transmitting the second conversion PWM signal to a controller, wherein the second conversion PWM signal and the first conversion PWM signal have the same duty ratio and switching frequency as the PWM signal; and a second sub-circuit, used for, on the basis of the PWM signal and the source power supply signal, together with the first sub-circuit, generating the first conversion PWM signal, wherein the first conversion PWM signal is further used for maintaining the second sub-circuit to output the power supply signal to the device side.

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 specifically, 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's often necessary to measure the speed of the motor. Hall effect sensors are commonly used for this purpose. Their output signal is a PWM signal that changes with the motor's rotation. Hall effect sensors can also be used to detect current in other circuit components in motor vehicles. During the motor's operation, the PWM signal (correlated with the motor's speed) output by the Hall effect sensor needs to be returned to a controller (such as an MCU) so that the controller can analyze the motor's status.

[0003] Hall effect sensors require power to operate, so an external power supply typically provides a power signal to the Hall effect sensors. Furthermore, as mentioned above, the Hall effect sensors also need to provide feedback to the controller, providing a PWM signal related to the motor's speed. Therefore, this feedback PWM signal must be transmitted back to the controller via separate wiring, as shown in Figure 1. While Figure 1 shows direct connections between the motor (including the motor and Hall effect sensors), the power supply, and the controller, signal processing circuits can be provided between the power supply and the motor, and between the controller and the motor, respectively, to ensure that the two signals meet the input signal requirements of the motor and controller, respectively.

[0004] It should be noted that the above-mentioned Hall sensors are merely exemplary components in a motor vehicle, and there may be other components or components in other applications that also need to be powered via respective wiring and / or need to feed back PWM signals to the controller via respective wiring.

[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 is provided for transmitting a power supply signal to a device side via a shared wiring, and receiving a pulse width modulation (PWM) signal from the device side via the shared wiring to transmit the PWM signal to a controller, the circuit comprising: a first sub-circuit for obtaining a second conversion PWM signal based on a source power supply signal and a first conversion PWM signal, and transmitting the second conversion PWM signal to the controller, the second conversion PWM signal and the first conversion PWM signal having the same duty cycle and switching frequency as the PWM signal; and a second sub-circuit for generating the first conversion PWM signal based on the PWM signal and the source power supply signal, wherein the first conversion PWM signal is also used to keep the second sub-circuit from outputting the power supply signal to the device side.

[0008] According to an embodiment of the present application, the first sub-circuit includes a power transfer circuit and a switching circuit, wherein the power transfer circuit is used to transfer the source power supply signal and control the amplitude of the first conversion PWM signal so that the switching circuit can switch, and the switching circuit is used to switch based on the first conversion PWM signal, thereby transferring the second conversion PWM signal having the same duty cycle and switching frequency as the first conversion PWM signal to the controller.

[0009] According to an embodiment of the present application, the first end of the power transfer circuit and the first end of the switching circuit are connected to the power supply, and wherein the switch control end of the switching circuit and the second end of the power transfer circuit are connected to the first end of the second sub-circuit, and the second end of the switching circuit is used to output the second conversion PWM signal, and wherein the signals at the switch control end of the switching circuit and the second end of the power transfer circuit are the first conversion PWM signal.

[0010] According to an embodiment of the present application, the power transfer circuit includes a first resistor and a first capacitor connected in parallel; and the switching circuit includes a first transistor, the control electrode of the first transistor serving as the switch control terminal of the switching circuit, and the first electrode of the first transistor serving as the first terminal of the switching circuit, and the second electrode serving as the second terminal of the switching circuit.

[0011] According to an embodiment of the present application, the second sub-circuit includes a signal conversion circuit, wherein the signal conversion circuit is used to convert a voltage signal serving as the first conversion PWM signal into a current signal serving as the power supply signal; and wherein the signal conversion circuit is also used to receive the PWM signal and generate the first conversion PWM signal based on the source power supply signal and the PWM signal.

[0012] According to an embodiment of the present application, the signal conversion circuit includes a second resistor, a third resistor, a second transistor and a clamping circuit, the first end of the second resistor serving as the first end of the second sub-circuit, connected to the first sub-circuit and the first end of the clamping circuit, and the second end of the second resistor is connected to the first electrode of the second transistor, the control electrode of the second transistor is connected to the second end of the clamping circuit and the first end of the third resistor, and the second electrode of the second transistor serves as the second end of the signal conversion circuit; the second end of the third resistor is connected to a reference voltage terminal or an enable circuit, wherein the enable circuit is used to control whether the second transistor is turned on and thus control whether the second sub-circuit is started; and the clamping circuit is used to maintain the voltage difference between the first electrode and the control electrode of the second transistor, so that the second transistor operates in a saturation region to output a constant current signal as the power supply signal.

[0013] According to an embodiment of the present application, the circuit further includes: an enabling circuit, configured to control whether to start the second sub-circuit in response to an enabling control signal from a controller.

[0014] According to an embodiment of the present application, the circuit further includes: a voltage regulation circuit, configured to perform voltage regulation on the second converted PWM signal output by the first sub-circuit so that the amplitude of the second converted PWM signal is the same as the amplitude of the PWM signal.

[0015] According to an embodiment of the present application, the circuit further includes: a filtering circuit, configured to filter the power supply signal output by the second sub-circuit.

[0016] According to an embodiment of the present application, the device side includes a Hall sensor, and the Hall sensor is used to measure the speed of the motor after operating based on the power supply signal, so as to feed back the PWM signal indicating the rotation speed of the motor to the circuit via the shared trace.

[0017] According to another aspect of the present application, a control circuit is provided, comprising a controller and the circuit for signal transmission as described above.

[0018] According to another aspect of the present application, a motor control system is provided, comprising: a motor; a Hall sensor for measuring the speed of the motor and generating a pulse width modulation (PWM) signal associated with the speed of the motor; a controller; and a circuit according to the above aspect, for providing a power supply signal to the Hall sensor via a shared trace, and receiving the PWM signal from the Hall sensor via the shared trace to transmit the PWM signal to the controller.

[0019] The signal transmission circuit of the present application can provide power signals to the device side and receive PWM signals from the device side via a shared bus, eliminating the need for separate wiring for providing power signals and wiring for feedback of PWM signals. This reduces the number of wiring and thus reduces costs. Furthermore, the circuit can adjust the power signals provided to the device side and the PWM signals to be input to the controller to meet different signal input requirements.

[0020] According to another aspect of the present application, a domain controller is provided, comprising the circuit for signal transmission as described above.

[0021] 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.

[0022] 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

[0023] 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.

[0024] FIG. 1 is a schematic diagram showing signal transmission between a controller and a Hall sensor according to an embodiment.

[0025] 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.

[0026] FIG3 shows a further schematic structural diagram of the circuit in FIG2 .

[0027] FIG4 shows a detailed circuit diagram of various parts of the circuit in FIG2 .

[0028] FIG5 shows a schematic diagram of a control circuit according to an embodiment of the present application.

[0029] FIG6 shows a schematic diagram of a motor vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Circuit 200 shown in FIG2 is used to provide a power supply signal P to a device (e.g., a Hall effect sensor for measuring motor speed) via a shared trace, and to receive a pulse width modulation (PWM) signal PWM from the device via the shared trace, thereby transmitting the PWM signal to a controller. The controller may be, for example, a microprocessor, a microcontroller unit, a digital controller, an application-specific integrated circuit, or any other integrated circuit capable of processing and outputting control signals.

[0034] As shown in FIG. 2 , the circuit 200 includes a first sub-circuit 210 and a second sub-circuit 220 .

[0035] The first sub-circuit 210 is configured to generate a second converted PWM signal SPWM-2 based on the received source power signal P0 and the first converted PWM signal SPWM-1, and transmit the second converted PWM signal SPWM-2 to the controller. The first converted PWM signal SPWM-1 and the second converted PWM signal SPWM-2 have the same switching frequency and duty cycle as the PWM signal received from the device side via the shared trace.

[0036] The second sub-circuit 220 is used to generate a first conversion PWM signal SPWM-1 together with the first sub-circuit based on the source power signal P0 and the PWM signal received via the shared trace, wherein the first conversion PWM signal is also used to keep the second sub-circuit outputting the power signal P to the device side.

[0037] Furthermore, as shown in FIG3 , the first sub-circuit 210 may include a power transfer circuit 210-1 and a switching circuit 210-2. The power transfer circuit 210-1 is configured to transfer a source power signal P0 from a power supply and, together with the second sub-circuit, control the amplitude of a first conversion PWM signal to enable switching of the switching circuit. The switching circuit 210-2 is configured to switch based on the first conversion PWM signal, for example, switching between a first level and a second level of the PWM signal, thereby providing a second conversion PWM signal having the same duty cycle and switching frequency as the first conversion PWM signal to the controller. The power supply may be within the circuit 200, but the power supply may also be external to the circuit 200.

[0038] For example, a first end of the power transfer circuit 210-1 and a first end of the switch circuit 210-2 in the first sub-circuit 210 may be connected to a power supply to receive a source power signal (having a voltage value VDD) from the power supply, and a switch control end of the switch circuit 210-2 and a second end of the power transfer circuit 210-1 are connected to a first end of the second sub-circuit, and the second end of the switch circuit 210-2 is used to output a second conversion PWM signal SPWM-2, and the signals at the switch control end of the switch circuit 210-2 and the second end of the power transfer circuit 210-1 are the first conversion PWM signal SPWM-1.

[0039] The second sub-circuit 220 includes a signal conversion circuit, which converts the voltage signal serving as the first converted PWM signal SPWM-1 into a current signal serving as a power supply signal for the device (Hall sensor). In other words, the signal conversion circuit may be a voltage-to-current conversion circuit. Furthermore, the signal conversion circuit, in conjunction with the first sub-circuit, generates the first converted PWM signal SPWM-1 based on the PWM signal fed back from the device and the source power supply signal. Optionally, the second sub-circuit may include a current limiting element to limit the current output from the second sub-circuit, thereby protecting the device, which serves as its load.

[0040] As can be seen, the second sub-circuit can utilize the power from the source power signal received via the first sub-circuit to generate and maintain a power supply signal to the device side. The first sub-circuit and the second sub-circuit can form a series path between the power supply source and the device side. Based on the source power signal and the PWM signal, a first converted PWM signal can be generated at the series node. This first converted PWM signal can have the same switching frequency and duty cycle as the fed-back PWM signal. This first converted PWM signal is then converted by the switching circuit in the first sub-circuit into a second converted PWM signal having the same switching frequency and duty cycle as the fed-back PWM signal, which is then output to the controller. The power supply signal can be provided to the device side and the PWM signal can be received from the device side via a shared bus, eliminating the need for separate routing for providing the power supply signal and routing for feeding back the PWM signal, thereby reducing the number of routing lines.

[0041] 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 .

[0042] More specifically, the power transfer circuit 210-1 includes a first resistor R1 and a first capacitor C1 connected in parallel. The switch circuit 210-2 includes a first transistor T1, wherein a control electrode of the first transistor T1 serves as a switch control terminal of the switch circuit 210-2, a first electrode of the first transistor T1 serves as a first terminal of the switch circuit 210-2, and a second electrode serves as a second terminal of the switch circuit 210-2.

[0043] The signal conversion circuit 220-1 of the second sub-circuit 220 includes a second resistor R2, a third resistor R3, a second transistor T2, and a clamping circuit CP. It should be noted that only one resistor is shown in the various figures of this application, but it can be obtained by connecting multiple resistors in series, in parallel, or in series and parallel.

[0044] A first end of the second resistor R2 serves as a first end of the second sub-circuit 220, is connected to the first sub-circuit 210 (e.g., to a second end of the power transfer circuit in the first sub-circuit) and a first end of the clamping circuit CP, and a second end of the second resistor R2 is connected to a first electrode of the second transistor T2.

[0045] The control electrode of the second transistor T2 is connected to the second end of the clamping circuit CP and the first end of the third resistor R3, and the second electrode of the second transistor T2 serves as the second end of the signal conversion circuit 220-1. The second end of the third resistor R3 is connected to a reference voltage terminal (for example, having a ground voltage) or an enable circuit, wherein the enable circuit is used to control whether the second transistor T2 is turned on and thus whether the second sub-circuit 220 is started. The clamping circuit is used to maintain the voltage difference between the first electrode and the control electrode of the second transistor T2, so that the second transistor T2 is turned on to output a constant current signal as a power supply signal. It can be seen that the second transistor T2 operates in the saturation region, so that the output current is in a suitable range, thereby protecting the device side as its load and meeting the power supply signal requirements of the load.

[0046] The operation process of the circuit 200 is described with reference to the circuit of FIG. 4 .

[0047] First, regarding the process of powering the device side (e.g., a Hall sensor), assuming the second sub-circuit is operating normally, for example, the enable circuit outputs a low level or the third resistor of the second sub-circuit is directly connected to the reference voltage terminal, the power supply provides a power signal P0 (having a power supply voltage VDD) to the first sub-circuit. The first resistor R1 (and its parallel first capacitor C1) in the power transfer circuit 210-1 can transfer power to the second sub-circuit, thereby enabling the clamp circuit CP to operate the second transistor in the saturation region, thereby turning on the second transistor T2 and outputting a constant current to the device side. At this time, when the second transistor T2 is turned on, the signal at the second terminal of the second transistor T2 includes a PWM signal fed back from the device side. Accordingly, this PWM signal is transmitted to the first terminal of the second transistor T2 via the turned-on second transistor T2. Since the current flowing through the second resistor R2 is a constant current, the signal at the first terminal of the second resistor R2 (i.e., the first terminal of the second sub-circuit) is also a PWM signal, i.e., a first converted PWM signal.

[0048] 4, when the second transistor T2 remains on, the amplitude of the first conversion PWM signal SPWM-1 relative to the reference voltage terminal can be expressed as Vpwm+I R2 *R2, where Vpwm is the voltage value of the feedback PWM signal, which changes with the switching frequency of the PWM signal, R2 represents the resistance value of the second resistor in the second sub-circuit, and I R2is the constant current flowing through the second resistor R2. It can be seen that the amplitude of the first converted PWM signal can be switched between a first amplitude and a second amplitude that are not zero. Therefore, when the voltage value of Vpwm is determined, by properly setting the value of the second resistor R2, the amplitude range of the first converted PWM signal can ensure that the clamping circuit of the second sub-circuit maintains normal operation, thereby maintaining the second transistor T2 on and ensuring operation in the saturation region.

[0049] The constant current signal output by the second subcircuit to the device side serves as the power supply signal P to be provided to the device side. If the device side still requires voltage power supply, the constant current signal can be further converted into a voltage signal to power the device side.

[0050] Then, for the process of feeding back the PWM signal received from the device side to the controller, as described above, the amplitude of the first conversion PWM signal SPWM-1 relative to the reference voltage terminal can be expressed as Vpwm+I R2 *R2, which has a first amplitude and a second amplitude as the amplitude of the PWM signal varies. When the first amplitude is reached, the first converted PWM signal turns on the first transistor T1 in the switching circuit (e.g., when VDD is greater than the first amplitude), thereby ensuring that the voltage at the second terminal of the first transistor is substantially VDD. When the second amplitude is reached, the first transistor T1 turns off (e.g., when VDD is less than the second amplitude), thereby ensuring that no voltage or a zero voltage is output at the second terminal of the first transistor. Consequently, a PWM signal, namely the second converted PWM signal, is also output from the second terminal of the first transistor (i.e., the second terminal of the switching circuit and the output terminal of the first sub-circuit 210). The amplitude of this second converted PWM signal switches between 0 and the voltage value VDD of the source power signal P0, and has the same switching frequency and duty cycle as the PWM signal and the second converted PWM signal. Therefore, the controller can also obtain information related to the feedback PWM signal, such as the measured motor speed, through this second converted PWM signal.

[0051] Therefore, this circuit can provide a power supply signal to the device side and receive a PWM signal from the device side via a shared bus, so there is no need to separately set up a line for providing a power supply signal and a line for feeding back a PWM signal, thereby reducing the number of lines.

[0052] Optionally, in order to make the function of the circuit more complete, the circuit may further include other circuit parts.

[0053] Continuing with FIG. 4 , based on the circuit structure shown in FIG. 2 , circuit 200 may further include an enabling circuit for controlling whether to activate the second sub-circuit in response to an enabling control signal from the controller. For example, a disable signal may be provided to the control electrode of the second transistor of the second sub-circuit to shut down the second transistor, thereby disabling the second sub-circuit and rendering the entire circuit shown in FIG. 2 inoperative. In other words, without the enabling circuit, the second sub-circuit and the entire circuit shown in FIG. 2 remain operational, and their normal operation is stopped through additional control means.

[0054] Alternatively, for example, the enabling circuit may include an enabling control transistor KT, the control electrode of which is connected to, for example, a pin of the controller for receiving an enabling control signal from the controller. A first electrode of the control transistor is connected to the second end of a third resistor R3 of the second sub-circuit, and a second electrode is connected to a reference voltage terminal (e.g., having a ground voltage). Optionally, a capacitor is provided between the control electrode of the control transistor and the reference voltage terminal for voltage stabilization and filtering. In addition, a voltage divider circuit (resistor) is provided between the input terminal of the enabling circuit and the reference voltage terminal to achieve current limiting and reduce the control electrode voltage, thereby protecting the transistor.

[0055] With reference to the specific structure of the signal conversion circuit in FIG4 , when the controller applies a valid signal to the control electrode of the control transistor, the control transistor is turned on, thereby connecting the second end of the third resistor R3 in the signal conversion circuit to the reference voltage terminal, so that the second sub-circuit 220 can operate normally. Conversely, when the controller does not apply a valid signal to the control electrode of the control transistor, the control transistor is turned off, so that the second end of the third resistor R3 is floating, and the second sub-circuit does not operate.

[0056] In addition, circuit 200 may further include a voltage regulation circuit, such as a voltage divider circuit. As described in conjunction with the operating process of the circuit structure in FIG4 , the feedback PWM signal is converted by the second sub-circuit 220 to obtain a first converted PWM signal and a second converted PWM signal. The periods of these three PWM signals can be considered to be substantially synchronized, but their amplitudes may vary to some extent. For example, the amplitude of the first converted PWM signal output to the controller switches between 0 and the voltage value VDD of the power supply signal, while the amplitude of the feedback PWM signal received via the shared trace may not be the same. Therefore, the voltage amplitude can be adjusted by the voltage regulation circuit.

[0057] The power supply signal output by circuit 200 can also be converted or shaped in the second sub-circuit before being output, for example, using a transistor to output a constant current signal, thereby meeting the power supply signal requirements of the device. Furthermore, circuit 200 converts the PWM signal fed back from the device into a second converted PWM signal, which can also meet the input requirements of the controller.

[0058] In addition, the circuit 200 may further include a filtering circuit, such as an RC filter, for filtering the power supply signal output by the second sub-circuit to obtain a filtered power supply signal to be provided to the device side for use.

[0059] In summary, by additionally including these additional circuits, the signal transmission effect of the circuit 200 can be improved.

[0060] According to another aspect of the present application, a control circuit is also provided.

[0061] FIG5 shows a schematic structural diagram of a control circuit according to an embodiment of the present application.

[0062] As shown in FIG. 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 FIG. 2-4 .

[0063] The control circuit 500 may be an integrated circuit having an input / output port for connection to a common trace. Thus, the circuit 200 can provide a power supply signal to a device (e.g., a Hall sensor) via the input / output port and the common trace. Furthermore, the circuit 200 can receive a PWM signal fed back from the device via the input / output port and the common trace, convert the signal, and provide a second converted PWM signal to the controller. FIG. 5 shows a power supply within the control circuit; however, the power supply may also be external to the control circuit.

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

[0065] The domain controller or regional controller is the core of each functional domain of the car. It mainly consists 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 features, the domain controller can integrate core functions that originally required many vehicle control units (ECUs) to implement, greatly improving the system function integration. In addition, the standardized interface for data exchange can greatly reduce the development and manufacturing costs of this part. The circuit described in this article can be used in 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 transmitting a signal, for transmitting a power supply signal to a device side via a shared wiring, and receiving a pulse width modulation (PWM) signal from the device side via the shared wiring to transmit the PWM signal to a controller, the circuit comprising: a first subcircuit, configured to obtain a second conversion PWM signal based on a source power supply signal and a first conversion PWM signal, and transmit the second conversion PWM signal to the controller, wherein the second conversion PWM signal and the first conversion PWM signal have the same duty cycle and switching frequency as the PWM signal; and The second sub-circuit is used to generate the first switching PWM signal based on the PWM signal and the source power supply signal together with the first sub-circuit, wherein the first switching PWM signal is also used to keep the second sub-circuit outputting the power supply signal to the device side.

2. The circuit according to claim 1, wherein The first sub-circuit includes a power transfer circuit and a switch circuit, The power transfer circuit is used to transfer the source power supply signal and control the amplitude of the first conversion PWM signal together with the second sub-circuit, so that the switch circuit can switch, and The switch circuit is used to switch based on the first conversion PWM signal, so as to transmit the second conversion PWM signal having the same duty cycle and switching frequency as the first conversion PWM signal to the controller.

3. The circuit according to claim 2, wherein: A first end of the power transfer circuit and a first end of the switch circuit are connected to the power supply, and wherein the switch control terminal of the switch circuit and the second terminal of the power transfer circuit are connected to the first terminal of the second sub-circuit, and the second terminal of the switch circuit is used to output the second conversion PWM signal, The signal at the switch control terminal of the switch circuit and the second terminal of the power transfer circuit is the first conversion PWM signal.

4. The circuit of claim 3, wherein: The power transfer circuit includes a first resistor and a first capacitor connected in parallel; and The switch circuit includes a first transistor, a control electrode of the first transistor serves as a switch control terminal of the switch circuit, a first electrode of the first transistor serves as a first terminal of the switch circuit, and a second electrode serves as a second terminal of the switch circuit.

5. The circuit according to claim 1, wherein: The second sub-circuit includes a signal conversion circuit, Wherein, the signal conversion circuit is used to convert the voltage signal as the first conversion PWM signal into a current signal as the power supply signal; The signal conversion circuit is further configured to receive the PWM signal, and together with the first sub-circuit, generate the first conversion PWM signal based on the source power supply signal and the PWM signal.

6. The circuit according to claim 5, wherein: The signal conversion circuit includes a second resistor, a third resistor, a second transistor and a clamping circuit. The first end of the second resistor serves as the first end of the second sub-circuit, connected to the first sub-circuit and the first end of the clamping circuit, and the second end of the second resistor is connected to the first electrode of the second transistor. The control electrode of the second transistor is connected to the second end of the clamp circuit and the first end of the third resistor, and the second electrode of the second transistor serves as the second end of the signal conversion circuit; The second end of the third resistor is connected to a reference voltage end or an enabling circuit, wherein the enabling circuit is used to control whether to turn on the second transistor and thus control whether to start the second sub-circuit; as well as The clamping circuit is used to maintain the voltage difference between the first electrode and the control electrode of the second transistor, so that the second transistor operates in a saturation region to output a constant current signal as the power supply signal.

7. The circuit according to claim 1, further comprising: The enabling circuit is used to control whether to start the second sub-circuit in response to an enabling control signal from a controller.

8. The circuit of claim 1 , further comprising: A voltage regulating circuit is used to perform voltage regulation on the second converted PWM signal output by the first sub-circuit so that the amplitude of the second converted PWM signal is the same as the amplitude of the PWM signal.

9. The circuit of claim 1 , further comprising: A filter circuit is used to filter the power supply signal output by the second sub-circuit.

10. The circuit according to claim 1, wherein the device side comprises a Hall sensor, and the Hall sensor is used to measure the speed of the motor after operating based on the power supply signal, so as to feed back the PWM signal indicating the rotation speed of the motor to the circuit via the shared trace.

11. A domain controller comprising the circuit for signal transmission according to any one of claims 1 to 10.

12. A control circuit comprising: Controller; as well as A circuit for signal transmission according to any one of claims 1 to 10.

13. A motor control system, comprising: Electric motor; a Hall sensor for measuring the speed of the motor and generating a pulse width modulation (PWM) signal indicating the speed of the motor; Controller; as well as The circuit according to any one of claims 1-10 is connected to the Hall sensor via a shared bus, is used to transmit a power supply signal to the Hall sensor via the shared wiring, and receives the PWM signal from the Hall sensor via the shared wiring to transmit the PWM signal to the controller.

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

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