CN219718254U - CAN card and signal conversion equipment - Google Patents

Abstract

The utility model discloses a CAN card and signal conversion equipment, wherein the CAN card comprises a miniCIE interface, a CAN controller, a CAN transceiver module, a CAN output port and a control module. The miniPCE interface is used for transmitting the received miniPCE signal to the CAN controller. The CAN controller is used for converting the MiniPCE signal into a CAN signal and transmitting the CAN signal to the CAN transceiver module. The CAN transceiver module is used for transmitting CAN signals to the CAN output port. The control module is used for controlling the CAN transceiver module to enter a low-power consumption mode or a normal working mode. The CAN card disclosed by the utility model CAN control the CAN transceiver module to enter a low-power-consumption mode when the CAN bus is in an idle state, so that the system power consumption is reduced.

Description

CAN card and signal conversion equipment

Technical Field

The utility model belongs to the technical field of signal conversion, and particularly relates to a CAN card and signal conversion equipment.

Background

The current CAN (Controller Area Network ) bus is widely applied to the industrial control field due to the advantages of high reliability, strong real-time performance and the like, and many CPUs (Central Processing Unit, central processing units) and Super input/output (Super input/output controllers) and the like do not support CAN interfaces, so that technologies of converting serial ports into CAN, converting USB (Universal Serial Bus ) into CAN, converting miniPCE (mini Peripheral Component Interconnect Express, high-speed interconnection standards of miniature peripheral devices) into CAN and the like are widely applied to the industrial control field. The miniCIE interface card is small and compact in appearance and high in tightness, so that the miniCIE interface card is more suitable for being manufactured into a CAN card to be used in the field of industrial control. However, various types of CAN cards in the form of miniCIE on the market are still in a normal working mode when a CAN bus is idle, so that the system power consumption is high.

Disclosure of Invention

The embodiment of the utility model provides a CAN card and signal conversion equipment, which CAN solve the problem that the system power consumption is high because the existing CAN card in the MiniPCE form is still in a normal working mode when a CAN bus is idle.

In a first aspect, an embodiment of the present utility model provides a CAN card, including a minicie interface, a CAN controller, a CAN transceiver module, a CAN output port, and a control module; the miniCIE interface is electrically connected with the CAN controller, and the CAN controller, the control module and the CAN output port are electrically connected with the CAN transceiver module;

the miniPCE interface is used for receiving a miniPCE signal and transmitting the miniPCE signal to the CAN controller; the CAN controller is used for converting the miniPCE signal into a CAN signal and transmitting the CAN signal to the CAN transceiver module; the CAN transceiver module is used for receiving the CAN signal and transmitting the CAN signal to the CAN output port; the control module is used for controlling the CAN transceiver module to enter a low-power consumption mode or a normal working mode.

In a possible implementation manner of the first aspect, the CAN transceiver module includes a CAN transceiver chip, a first capacitance unit, a second capacitance unit, a third capacitance unit, and a filtering unit;

the first capacitance unit, the second capacitance unit, the third capacitance unit and the filtering unit are all electrically connected with the CAN transceiver chip.

In a possible implementation manner of the first aspect, the first capacitor unit includes a first capacitor and a second capacitor, a first end of the first capacitor is electrically connected to a first end of the second capacitor, the CAN transceiver chip and a first dc power supply, and a second end of the first capacitor is electrically connected to a second end of the second capacitor and is grounded.

In a possible implementation manner of the first aspect, the second capacitor unit includes a third capacitor and a fourth capacitor, a first end of the third capacitor is electrically connected to the first end of the fourth capacitor, the CAN transceiver chip and the second dc power supply, and a second end of the third capacitor is electrically connected to the second end of the fourth capacitor and grounded.

In a possible implementation manner of the first aspect, the third capacitor unit includes a fifth capacitor and a sixth capacitor, a first end of the fifth capacitor is electrically connected to the first end of the sixth capacitor, the CAN transceiver chip and the third dc power supply, and a second end of the fifth capacitor is electrically connected to the second end of the sixth capacitor and grounded.

In a possible implementation manner of the first aspect, the filtering unit includes a first magnetic bead, a second magnetic bead, a seventh capacitor and an eighth capacitor;

the first end of the seventh capacitor is electrically connected with the first end of the first magnetic bead and the CAN receiving and dispatching chip respectively, the second end of the seventh capacitor is electrically connected with the first end of the second magnetic bead and the CAN receiving and dispatching chip respectively, the first end of the eighth capacitor is electrically connected with the second end of the first magnetic bead and the fourth direct current power supply respectively, and the second end of the eighth capacitor is electrically connected with the second end of the second magnetic bead and grounded.

In a possible implementation manner of the first aspect, the model number of the CAN transceiver chip is ADM3057EBRWZ.

In a possible implementation manner of the first aspect, the CAN card further includes an anti-interference unit, a first end of the anti-interference unit is electrically connected with the CAN transceiver module, and a second end of the anti-interference unit is electrically connected with the CAN output port.

In a possible implementation manner of the first aspect, the anti-interference unit includes a common mode inductor, a ninth capacitor and a tenth capacitor, a first coil of the common mode inductor is connected in series between the CAN transceiver module and the CAN output port, a second coil of the common mode inductor is connected in series between the CAN transceiver module and the CAN output port, a first end of the ninth capacitor is electrically connected with the second coil of the common mode inductor, a first end of the tenth capacitor is electrically connected with the first coil of the common mode inductor, and a second end of the ninth capacitor and a second end of the tenth capacitor are electrically connected to ground.

In a second aspect, an embodiment of the present utility model provides a signal conversion device, including a CAN card as set forth in any one of the first aspects.

Compared with the prior art, the embodiment of the utility model has the beneficial effects that:

the CAN card provided by the embodiment of the utility model comprises a miniCIE interface, a CAN controller, a CAN transceiver module, a CAN output port and a control module. The MiniPCE interface is electrically connected with the CAN controller and is used for receiving the MiniPCE signal and transmitting the MiniPCE signal to the CAN controller. The CAN controller is electrically connected with the CAN transceiver module and is used for converting the MiniPCE signal into a CAN signal and transmitting the CAN signal to the CAN transceiver module. The CAN transceiver module is electrically connected with the CAN controller and is used for receiving the CAN signals and transmitting the CAN signals to the CAN output port. The control module is electrically connected with the CAN transceiver module, and when the CAN transceiver module outputs CAN signals, the CAN bus is in a working state, the control module controls the CAN transceiver module to enter a working mode, and the CAN transceiver module CAN normally output the CAN signals, so that the CAN bus CAN normally work. When the CAN receiving and transmitting module does not output CAN signals, the CAN bus is in an idle state, the control module controls the CAN receiving and transmitting module to enter a low-power consumption mode, and the CAN receiving and transmitting module does not output the CAN signals any more, so that the overall power consumption of the system is reduced. The CAN card provided by the embodiment of the utility model CAN control the CAN transceiver module to enter a low-power consumption mode when the CAN bus is in an idle state, so that the overall power consumption of the system is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a functional block diagram of a CAN card provided by an embodiment of the utility model;

FIG. 2 is a functional block diagram of a CAN card provided by another embodiment of the utility model;

FIG. 3 is a schematic block diagram of a CAN transceiver module according to an embodiment of the utility model;

fig. 4 is a schematic circuit connection diagram of a CAN transceiver module according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a circuit connection of an anti-interference unit according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a circuit connection of an anti-interference protection unit according to an embodiment of the present utility model;

FIG. 7 is a block diagram of a CAN card provided by an embodiment of the utility model;

FIG. 8 is a functional block diagram of a circuit board mated with a CAN card in accordance with one embodiment of the utility model;

fig. 9 is a structural diagram of a circuit board matched with a CAN card according to an embodiment of the present utility model.

In the figure: 10. a miniPCE interface; 20. a CAN controller; 30. a CAN transceiver module; 301. CAN receiving and transmitting chip; 302. a first capacitor unit; 303. a second capacitor unit; 304. a third capacitor unit; 305. a filtering unit; 31. a first CAN transceiver module; 32. a second CAN transceiver module; 40. CAN output port; 41. a first CAN output port; 42. a second CAN output port; 50. a control module; 60. an anti-interference unit; 70. an anti-interference protection unit; 701. an anti-interference circuit; 702. a protection circuit; 80. a terminal resistor selection module; 90. a circuit board input port; 100. and a circuit board output port.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present utility model with unnecessary detail.

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

As used in the present description and the appended claims, the term "if" may be interpreted in context as "when …" or "upon" or "in response to a determination" or "in response to detection. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".

Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the utility model. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

Because the miniCIE interface card has small and compact appearance and stronger fastening property, the miniCIE interface card is more suitable for being manufactured into a CAN card to be used in the field of industrial control. However, various types of CAN cards in the form of miniCIE on the market are still in a normal working mode when a CAN bus is idle, so that the system power consumption is high.

Based on the above problems, the CAN card provided by the embodiment of the utility model comprises a miniCIE interface, a CAN controller, a CAN transceiver module, a CAN output port and a control module. The MiniPCE interface is electrically connected with the CAN controller and is used for receiving the MiniPCE signal and transmitting the MiniPCE signal to the CAN controller. The CAN controller is electrically connected with the CAN transceiver module and is used for converting the MiniPCE signal into a CAN signal and transmitting the CAN signal to the CAN transceiver module. The CAN transceiver module is electrically connected with the CAN controller and is used for receiving the CAN signals and transmitting the CAN signals to the CAN output port. The control module is electrically connected with the CAN transceiver module, and when the CAN transceiver module outputs CAN signals, the CAN bus is in a working state, the control module controls the CAN transceiver module to enter a working mode, and the CAN transceiver module CAN normally output the CAN signals, so that the CAN bus CAN normally work. When the CAN receiving and transmitting module does not output CAN signals, the CAN bus is in an idle state, the control module controls the CAN receiving and transmitting module to enter a low-power consumption mode, and the CAN receiving and transmitting module does not output the CAN signals any more, so that the overall power consumption of the system is reduced. The CAN card provided by the embodiment of the utility model CAN control the CAN transceiver module to enter a low-power consumption mode when the CAN bus is in an idle state, so that the overall power consumption of the system is reduced.

In order to illustrate the technical scheme of the utility model, the following description is made by specific examples.

Fig. 1 shows a functional block diagram of a CAN card according to an embodiment of the present utility model. Referring to fig. 1, the CAN card includes a minicie interface 10, a CAN controller 20, a CAN transceiver module 30, a CAN output port 40, and a control module 50. The miniCIE interface 10 is electrically connected with the CAN controller 20, and the CAN controller 20, the control module 50 and the CAN output port 40 are electrically connected with the CAN transceiver module 30.

Specifically, the minicie interface 10 is configured to receive the minicie signal and transmit the minicie signal to the CAN controller 20. The CAN controller 20 is configured to convert the minicie signal into a CAN signal and transmit the CAN signal to the CAN transceiver module 30. The CAN transceiver module 30 is configured to receive the CAN signal and transmit the CAN signal to the CAN output port 40. The control module 50 is electrically connected with the CAN transceiver module 30, when the CAN transceiver module 30 outputs CAN signals, the CAN bus is in a working state, the control module 50 controls the CAN transceiver module 30 to enter a working mode, the CAN transceiver module 30 CAN normally output the CAN signals, and the CAN bus CAN normally work. When the CAN transceiver module 30 does not output a CAN signal, it indicates that the CAN bus is in an idle state, and the control module 50 controls the CAN transceiver module 30 to enter a low power consumption mode, and the CAN transceiver module 30 does not output a CAN signal any more, thereby reducing the overall power consumption of the system. The CAN card provided by the embodiment of the utility model CAN control the CAN transceiver module 30 to enter a low-power consumption mode when the CAN bus is in an idle state, so that the overall power consumption of the system is reduced.

As shown in fig. 2, the CAN signal may be a CAN signal, including a CANL (Low-level CAN Busline, low-level CAN1 bus) signal and a CANH (High-level CAN Busline, high-level CAN1 bus) signal. At this time, the CAN card of the present utility model includes the first CAN transceiver module 31 and the first CAN output port 41. The first CAN transceiver module 31 has a CAN signal isolation function and a power isolation function, and is configured to receive a CANH signal and a CANL signal, and transmit the isolated CANH signal and CANL signal to the first CAN output port 41.

The CAN signal CAN also be two paths of CAN signals, including a CAN1H signal, a CAN1L signal, a CAN2H signal and a CAN2L signal. At this time, the CAN card of the present utility model includes the first CAN transceiver module 31, the first CAN output port 41, the second CAN transceiver module 32, and the second CAN output port 42. The first CAN transceiver module 31 has a CAN signal isolation function and a power isolation function, and is configured to receive a CAN1H signal and a CAN1L signal, and transmit the isolated CAN1H signal and CAN1L signal to the first CAN output port 41. Meanwhile, the second CAN transceiver module 32 has a CAN signal isolation function and a power isolation function, and is configured to receive the CAN2H signal and the CAN2L signal, and transmit the isolated CAN2H signal and CAN2L signal to the second CAN output port 42.

When the first CAN transceiver module 31 outputs CAN signals (CAN 1H signals and CAN1L signals), it is indicated that the CAN bus is in a working state, and the control module 50 controls the first CAN transceiver module 31 to enter a working mode, and the first CAN transceiver module 31 CAN normally output CAN signals, so as to ensure that the CAN bus CAN normally work. When the first CAN transceiver module 31 outputs no CAN signal (CAN 1H signal and CAN1L signal), it indicates that the CAN bus is in an idle state, and the control module 50 controls the first CAN transceiver module 31 to enter a low power consumption mode, and the first CAN transceiver module 31 does not output any CAN signal any more, thereby reducing the overall power consumption of the system.

For example, a designer may choose a model of the CAN controller according to the actual situation. For example, a CAN controller of model F81601N is selected.

The CAN transceiver module 30 (the first CAN transceiver module and the second CAN transceiver module) CAN select a transceiver module with CAN signal isolation function and CAN power isolation function, thereby being beneficial to the integrated design of a CAN card and reducing the design difficulty of a circuit board.

Fig. 3 shows a functional block diagram of a CAN transceiver module 30 according to an embodiment of the present utility model. Referring to fig. 3, the CAN transceiver module 30 includes a CAN transceiver chip 301, a first capacitance unit 302, a second capacitance unit 303, a third capacitance unit 304, and a filter unit 305. The first capacitance unit 302, the second capacitance unit 303, the third capacitance unit 304 and the filtering unit 305 are all electrically connected with the CAN transceiver chip 301.

Specifically, the first capacitance unit 302, the second capacitance unit 303 and the third capacitance unit 304 are all electrically connected with the CAN transceiver chip 301, and are all used for filtering high-frequency ac components of a power supply end of the CAN transceiver chip 301, so that the influence of high-frequency ac signals on the CAN transceiver chip 301 is reduced, and safe and reliable operation of a CAN bus network is ensured. The filtering unit 305 is used for filtering high-frequency noise, effectively eliminating the influence of noise on the CAN bus on the quality of the CAN signal, and improving the quality of the CAN signal.

For example, a designer may select the model of the CAN transceiver chip 301 according to the actual situation. For example, a CAN transceiver chip 301 of model ADM3057EBRWZCAN is selected. The CAN transceiver chip 301 with the model of ADM3057EBRWZCAN is internally integrated with a CAN signal isolation function, and also has a CAN power isolation function, thereby being beneficial to the integrated design of a CAN card and reducing the design difficulty of a circuit board.

It should be noted that, the STBY pin of the CAN transceiver chip 301 is electrically connected to the output end of the control module 50, the CANH pin of the CAN transceiver chip 301 is electrically connected to the first input pin of the control module 50, and the CANH pin of the CAN transceiver chip 301 is electrically connected to the second input pin of the control module 50. The first input pin and the second input pin of the control module 50 are both used for receiving the CAN signal output by the CAN transceiver chip 301. When the control module 50 has a signal input, the output pin of the control module 50 outputs a low level to the STBY pin of the CAN transceiver chip 301, and at this time, the STBY pin of the CAN transceiver chip 301 is pulled down, and the CAN transceiver chip 301 enters a normal operation mode. When no signal is input to the control module 50, the output pin of the control module 50 outputs a high level to the STBY pin of the CAN transceiver chip 301, and at this time, the STBY pin of the CAN transceiver chip 301 is pulled high, and the CAN transceiver chip 301 enters a low power consumption mode, thereby reducing the power consumption of the whole system.

For example, when the CAN transceiver chip 301 enters the normal operation mode, the power consumption is 2.35W in an environment with a temperature of 25 ℃; when the CAN transceiver chip 301 enters the low power consumption mode, the power consumption is 0.18W in an environment with a temperature of 25 ℃.

The control module 50 includes, for example, a control chip, which is CH558L.

Fig. 4 shows a schematic circuit connection diagram of the CAN transceiver module 30 according to an embodiment of the utility model. Referring to fig. 4, the first capacitor unit 302 includes a first capacitor C1 and a second capacitor C2, wherein a first end of the first capacitor C1 is electrically connected to a first end of the second capacitor C2, the CAN transceiver 301, and the first dc power VCC1, and a second end of the first capacitor C1 is electrically connected to a second end of the second capacitor C2 and grounded.

Specifically, the first capacitor C1 and the second capacitor C2 both have the function of preventing the direct current signal and allowing the alternating current signal to pass through, and meanwhile, the first capacitor C1 and the second capacitor C2 can also reduce the low-frequency signal to pass through and increase the high-frequency signal to pass through. The first capacitor C1 and the second capacitor C2 are both used for filtering out the high-frequency ac component of the first dc power VCC1 end of the CAN transceiver chip 301, so as to reduce the influence of the high-frequency ac signal on the CAN transceiver chip 301 and ensure safe and reliable operation of the CAN bus network. The first capacitor C1 is further configured to store energy, that is, the first direct current power VCC1 provides electric energy for the first capacitor C1.

For example, the designer may choose the capacitance value of the first capacitor C1 and the second capacitor C2 and the corresponding withstand voltage value according to the actual situation. For example, the capacitance of the first capacitor C1 may be 10 μf, the withstand voltage may be 15V, and the capacitance of the second capacitor C2 may be 0.1 μf, and the withstand voltage may be 15V. The designer may also set the voltage of the first direct current power supply VCC1 according to the actual situation, for example, set the voltage of the first direct current power supply VCC1 to 5V.

In one embodiment of the present utility model, as shown in fig. 4, the second capacitor unit 303 includes a third capacitor C3 and a fourth capacitor C4, where a first end of the third capacitor C3 is electrically connected to a first end of the fourth capacitor C4, the CAN transceiver 301, and the second dc power VCC2, and a second end of the third capacitor C3 is electrically connected to a second end of the fourth capacitor C4 and grounded.

Specifically, the third capacitor C3 and the fourth capacitor C4 both have the function of preventing the direct current signal and allowing the alternating current signal to pass through, and meanwhile, the third capacitor C3 and the fourth capacitor C4 can also reduce the low-frequency signal to pass through and increase the high-frequency signal to pass through. The third capacitor C3 and the fourth capacitor C4 are both used for filtering out the high-frequency ac component at the second dc power VCC2 end of the CAN transceiver chip 301, so as to reduce the influence of the high-frequency ac signal on the CAN transceiver chip 301 and ensure safe and reliable operation of the CAN bus network.

For example, the designer may choose the capacitance value of the third capacitor C3 and the fourth capacitor C4 and the corresponding withstand voltage value according to the actual situation. For example, the capacitance of the third capacitor C3 may be 0.1 μf, the withstand voltage of 16V, the capacitance of the fourth capacitor C4 may be 0.01 μf, and the withstand voltage of 50V. The designer may also set the voltage of the second dc power source VCC2 according to the actual situation, for example, set the voltage of the second dc power source VCC2 to 5V.

In one embodiment of the present utility model, as shown in fig. 4, the third capacitor unit 304 includes a fifth capacitor C5 and a sixth capacitor C6, wherein a first end of the fifth capacitor C5 is electrically connected to a first end of the sixth capacitor C6, the CAN transceiver 301 and the third dc power VCC3, and a second end of the fifth capacitor C5 is electrically connected to a second end of the sixth capacitor C6 and grounded.

Specifically, the fifth capacitor C5 and the sixth capacitor C6 each have the function of blocking the direct current signal and allowing the alternating current signal to pass through, and meanwhile, the fifth capacitor C5 and the sixth capacitor C6 can also reduce the low-frequency signal to pass through and increase the high-frequency signal to pass through. The fifth capacitor C5 and the sixth capacitor C6 are both used for filtering out the high-frequency ac component at the third dc power VCC3 end of the CAN transceiver chip 301, so as to reduce the influence of the high-frequency ac signal on the CAN transceiver chip 301 and ensure safe and reliable operation of the CAN bus network.

It should be noted that, the third dc power VCC3 is a CAN signal power, and the second end of the sixth capacitor C6 is electrically connected to the CAN signal ground GND-CAN to form a communication signal loop.

For example, the designer may choose the capacitance values of the fifth capacitor C5 and the sixth capacitor C6 and the corresponding withstand voltage values according to the actual situation. For example, the capacitance of the fifth capacitor C5 may be 0.01 μf, the withstand voltage of 50V, the capacitance of the sixth capacitor C6 may be 0.1 μf, and the withstand voltage of 16V.

In one embodiment of the present utility model, as shown in fig. 4, the filtering unit 305 includes a first magnetic bead FB1, a second magnetic bead FB2, a seventh capacitor C7, and an eighth capacitor C8. The first end of the seventh capacitor C7 is electrically connected to the first end of the first magnetic bead FB1 and the CAN transceiver chip 301, the second end of the seventh capacitor C7 is electrically connected to the first end of the second magnetic bead FB2 and the CAN transceiver chip 301, the first end of the eighth capacitor C8 is electrically connected to the second end of the first magnetic bead FB1 and the fourth dc power supply VCC4, and the second end of the eighth capacitor C8 is electrically connected to the second end of the second magnetic bead FB2 and grounded.

Specifically, the first magnetic bead FB1 and the second magnetic bead FB2 are both configured to absorb high-frequency noise in the fourth dc power supply VCC4, reduce the influence of the high-frequency noise on the CAN transceiver chip 301, and ensure safe and reliable operation of the CAN bus network. The seventh capacitor C7 and the eighth capacitor C8 both have the function of preventing direct current signals and allowing alternating current signals to pass through, and meanwhile, the seventh capacitor C7 and the eighth capacitor C8 can also reduce low-frequency signals to pass through and increase high-frequency signals to pass through. The seventh capacitor C7 is used for filtering out the high-frequency ac component input to the CAN transceiver chip 301. The eighth capacitor C8 is configured to filter out a high-frequency ac component at the fourth dc power VCC4 end of the CAN transceiver chip 301, thereby reducing an influence of the high-frequency ac signal on the CAN transceiver chip 301, and ensuring safe and reliable operation of the CAN bus network.

The fourth dc power VCC4 is a CAN signal power, and the second end of the eighth capacitor C8 is electrically connected to the CAN signal ground GND-CAN to form a communication signal loop.

For example, the designer may select the impedance, rated current, and dc impedance parameters of the first magnetic bead FB1 and the second magnetic bead FB2 according to the actual situation. For example, a first magnetic bead FB1 and a second magnetic bead FB2 capable of achieving 600 Ω in impedance at 100MHz are selected, rated currents of the first magnetic bead FB1 and the second magnetic bead FB2 are 1A, and direct current impedances of the first magnetic bead FB1 and the second magnetic bead FB2 are 200mΩ. The designer can select the capacitance value and the corresponding withstand voltage value of the seventh capacitor C7 and the eighth capacitor C8 according to the actual situation. For example, the capacitance of the seventh capacitor C7 may be 0.1 μf, the withstand voltage of 16V, the capacitance of the eighth capacitor C8 may be 10 μf, and the withstand voltage of 16V.

Fig. 5 shows a schematic circuit connection diagram of an anti-interference unit 60 according to an embodiment of the utility model. Referring to fig. 5, the CAN card further includes an anti-interference unit 60, a first end of the anti-interference unit 60 is electrically connected to the CAN transceiver module 30, and a second end of the anti-interference unit 60 is electrically connected to the CAN output port 40.

Specifically, the anti-interference unit 60 is connected in series between the CAN transceiver module 30 and the CAN output port 40, and is used for filtering noise in the CAN signal output by the CAN transceiver module 30, avoiding interference to the CAN card caused by a large amount of noise contained in the CAN signal, and improving the use security of the CAN card.

In one embodiment of the present utility model, as shown in fig. 5, the anti-interference unit 60 includes a common-mode inductor F1, a first resistor R1, a second resistor R2, a ninth capacitor C9, and a tenth capacitor C10.

The first coil of the common-mode inductor F1 is connected in series between the CAN transceiver module 30 and the CAN output port 40, the second coil of the common-mode inductor F1 is connected in series between the CAN transceiver module 30 and the CAN output port 40, the first resistor R1 is connected in parallel with the first coil of the common-mode inductor F1, the second resistor R2 is connected in parallel with the second coil of the common-mode inductor F1, the first end of the ninth capacitor C9 is electrically connected with the second coil of the common-mode inductor F1, the first end of the tenth capacitor C10 is electrically connected with the first coil of the common-mode inductor F1, and the second end of the ninth capacitor C9 is electrically connected with the second end of the tenth capacitor C10 and grounded.

Specifically, the common mode inductor F1 is used for primarily filtering noise from the CAN signal, so that the interference of a large amount of noise contained in the CAN signal to the CAN card is avoided, and the quality of the CAN card is improved. The first resistor R1 and the second resistor R2 are used for installing the first resistor R1 and the second resistor R2 when the CAN card works in an environment with less interference, and are used for replacing the common mode inductance F1 so as to reduce the cost of the CAN card. The ninth capacitor C9 and the tenth capacitor C10 are used for filtering out high-frequency interference on the CAN bus and preventing electromagnetic radiation.

The second end of the ninth capacitor C9 and the second end of the tenth capacitor C10 are electrically connected to the CAN signal ground GND-CAN, so as to form a communication signal loop.

For example, the designer may set the resistance and the accuracy of the first resistor R1 and the second resistor R2 according to the actual situation. For example, the resistance values of the first resistor R1 and the second resistor R2 are set to 0Ω, and the precision of the first resistor R1 and the second resistor R2 is set to 5%. The designer can choose the capacitance value and the corresponding withstand voltage value of the ninth capacitor C9 and the tenth capacitor C10 according to the actual situation. For example, the capacitance value of the ninth capacitor C9 may be 220PF, the withstand voltage value may be 50V, the capacitance value of the tenth capacitor C10 may be 220PF, and the withstand voltage value may be 50V.

As shown in fig. 6, the CAN card further includes an anti-interference protection unit 70, where the anti-interference protection unit 70 is connected in series between the CAN transceiver module 30 and the CAN output port 40. The anti-interference protection unit 70 includes an anti-interference circuit 701 and a protection circuit 702, where the anti-interference circuit 701 includes a third magnetic bead FB3, a fourth magnetic bead FB4, an eleventh capacitor C11, and a twelfth capacitor C12. The first end of the third magnetic bead FB3 and the first end of the fourth magnetic bead FB4 are electrically connected with the CAN transceiver module 30, the second end of the third magnetic bead FB3 is electrically connected with the first end of the twelfth capacitor C12, the second end of the fourth magnetic bead FB4 is electrically connected with the first end of the eleventh capacitor C11, and the second end of the eleventh capacitor C11 is electrically connected with the second end of the twelfth capacitor C12 and grounded.

Specifically, the third magnetic bead FB3 and the fourth magnetic bead FB4 are used for absorbing high-frequency noise in the CAN signals, reducing the influence of the high-frequency noise on the circuit board and ensuring safe and reliable operation of the CAN bus network. The eleventh capacitor C11 and the twelfth capacitor C12 each have the function of blocking the direct current signal and allowing the alternating current signal to pass through, and meanwhile, the eleventh capacitor C11 and the twelfth capacitor C12 can reduce the low-frequency signal to pass through and increase the high-frequency signal to pass through. The eleventh capacitor C11 and the twelfth capacitor C12 are both used for high-frequency interference on the CAN bus to prevent electromagnetic radiation.

The second end of the eleventh capacitor C11 and the second end of the twelfth capacitor C12 are electrically connected to the CAN signal ground GND-CAN, so as to form a communication signal loop.

For example, the designer may choose the impedance, rated current and dc impedance parameters of the third magnetic bead FB3 and the fourth magnetic bead FB4 according to the actual situation. For example, a third magnetic bead FB3 and a fourth magnetic bead FB4 capable of having an impedance of 600Ω at 100MHz were selected, rated currents of the third magnetic bead FB3 and the fourth magnetic bead FB4 were each 1A, and direct-current impedances of the third magnetic bead FB3 and the fourth magnetic bead FB4 were each 200mΩ. The designer can choose the capacitance value and the corresponding withstand voltage value of the eleventh capacitor C11 and the twelfth capacitor C12 according to the actual situation. For example, the capacitance value of the eleventh capacitor C11 may be 220PF, the withstand voltage value may be 50V, the capacitance value of the twelfth capacitor C12 may be 220PF, and the withstand voltage value may be 50V.

The protection circuit 702 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first TSS tube (Thyristor Surge Suppressors, semiconductor discharge tube) D1, and a second TSS tube D2. The first end of the third resistor R3 is electrically connected to the second end of the fourth bead FB4, the first end of the eleventh capacitor C11 and the first end of the sixth resistor R6, the first end of the fourth resistor R4 is electrically connected to the second end of the third bead FB3, the first end of the twelfth capacitor C12 and the first end of the fifth resistor R5, the second end of the fifth resistor R5 is electrically connected to the first end of the second TSS tube D2 and the CAN output port 40, the second end of the sixth resistor R6 is electrically connected to the first end of the first TSS tube D1 and the CAN output port 40, and the second end of the third resistor R3 is electrically connected to the second end of the fourth resistor R4, the second end of the first TSS tube D1 and the second end of the second TSS tube D2, respectively, and to ground.

Specifically, the third resistor R3 and the fourth resistor R4 are patch piezoresistors, which can clamp overvoltage and absorb redundant current. The fifth resistor R5 and the sixth resistor R6 are packaged by 0805 for over-current. The first TSS tube and the second TSS tube are patch TSS tubes for overvoltage protection.

The second end of the third resistor R3, the second end of the fourth resistor R4, the second end of the first TSS tube D1, and the second end of the second TSS tube D2 are connected to the CHASSIS ground GND-passis, so that the CAN signal CAN be prevented from being disturbed.

For example, the designer may choose the resistance and the accuracy of the fifth resistor R5 and the sixth resistor R6 according to the actual situation. For example, the resistance values of the fifth resistor R5 and the sixth resistor R6 are set to 4.7Ω, and the precision of the first resistor R1 and the second resistor R2 is set to 5%.

Fig. 7 shows a structural diagram of a CAN card according to an embodiment of the present utility model. Referring to fig. 7, the CAN card includes a minicie interface 10, a CAN controller 20, a CAN transceiver module 30, a CAN output port 40, and an interference rejection unit 60. The miniCIE interface 10 is electrically connected with the CAN controller 20, and the CAN controller 20 and the CAN output port 40 are electrically connected with the CAN transceiver module 30.

Specifically, the minicie interface 10 is configured to receive the minicie signal and transmit the minicie signal to the CAN controller 20. The CAN controller 20 is configured to convert the minicie signal into a CAN signal and transmit the CAN signal to the CAN transceiver module 30. The CAN transceiver module 30 is configured to receive the CAN signal and transmit the CAN signal to the CAN output port 40.

The tamper protection unit 70, the termination resistor selection module 80, the circuit board input port 90, and the circuit board output port 100 may be integrated on a circuit board mated with a CAN card. Fig. 8 shows a schematic block diagram of a circuit board matched with a CAN card according to an embodiment of the present utility model. Referring to fig. 8, the circuit board includes an anti-interference protection unit 70, a termination resistance selection module 80, a circuit board input port 90, and a circuit board output port 100. The circuit board input port 90 is electrically connected to a first end of the termination resistor selection module 80, a first end of the anti-tamper protection unit 70 is electrically connected to a second end of the termination resistor selection module 80, and a second end of the anti-tamper protection unit 70 is electrically connected to the circuit board output port 100.

Specifically, the circuit board input port 90 is configured to receive a CAN signal output by the CAN card, and transmit the CAN signal to the terminal resistor selection module 80. The terminal resistor selection module 80 is configured to receive the CAN signal, transmit the CAN signal to the anti-interference protection unit 70, and control on/off of the terminal resistor. The anti-interference protection unit 70 is used for eliminating noise on the CAN bus, reducing the influence of high-frequency ac signals on the CAN transceiver chip 301, and ensuring safe and reliable operation of the CAN bus network. The circuit board output port 100 can be used by a user conveniently, and the practicability is improved.

It should be noted that, the terminal resistor selecting module 80 may control the connection and disconnection of the terminal resistor by toggling a dial switch, where the dial switch is disposed at an edge of the circuit board, so as to facilitate the operation of a user. The CAN card is provided with the terminal resistor selection module 80, so that a user CAN conveniently control the connection or disconnection of the terminal resistor, the terminal resistor is disconnected on the CAN card without disassembling the whole machine, convenience is provided for the user, and the practicability of the CAN card is improved.

Illustratively, the termination resistor is connected in series between CANH and CANL. The designer can select the resistance and the precision of termination resistance. For example, a termination resistor with a resistance of 120Ω and an accuracy of 1% is selected, and the termination resistor selection module 80 is used for controlling the connection and disconnection of the termination resistor with a resistance of 120Ω.

Illustratively, the circuit board output port 100 is a CAN output port in the form of DB 9.

Fig. 9 shows a structural diagram of a circuit board matched with a CAN card according to an embodiment of the present utility model. Referring to fig. 9, the circuit board includes an anti-interference protection unit 70, a termination resistance selection module 80, a circuit board input port 90, and a circuit board output port 100. The circuit board input port 90 is electrically connected to a first end of the termination resistor selection module 80, a first end of the anti-tamper protection unit 70 is electrically connected to a second end of the termination resistor selection module 80, and a second end of the anti-tamper protection unit 70 is electrically connected to the circuit board output port 100.

Specifically, the circuit board input port 90 is configured to receive a CAN signal output by the CAN card, and transmit the CAN signal to the terminal resistor selection module 80. The terminal resistor selection module 80 is configured to receive the CAN signal, transmit the CAN signal to the anti-interference protection unit 70, and control on/off of the terminal resistor. The anti-interference protection unit 70 is used for eliminating noise on the CAN bus, reducing the influence of high-frequency ac signals on the CAN transceiver chip 301, and ensuring safe and reliable operation of the CAN bus network. The circuit board output port 100 can be used by a user conveniently, and the practicability is improved.

The utility model also discloses a signal conversion device which comprises the CAN card, wherein the signal conversion device is provided with the CAN card, so that the CAN transceiver module 30 CAN be controlled to enter a low-power-consumption mode when the CAN bus is in an idle state, and the power consumption of the system is reduced.

Since the processing and the functions implemented by the signal conversion device in this embodiment basically correspond to the embodiments, principles and examples of the CAN card, the description of this embodiment is not exhaustive, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.

Claims (10)

1. The CAN card is characterized by comprising a miniPCE interface, a CAN controller, a CAN transceiver module, a CAN output port and a control module; the miniCIE interface is electrically connected with the CAN controller, and the CAN controller, the control module and the CAN output port are electrically connected with the CAN transceiver module;

the miniPCE interface is used for receiving a miniPCE signal and transmitting the miniPCE signal to the CAN controller; the CAN controller is used for converting the miniPCE signal into a CAN signal and transmitting the CAN signal to the CAN transceiver module; the CAN transceiver module is used for receiving the CAN signal and transmitting the CAN signal to the CAN output port; the control module is used for controlling the CAN transceiver module to enter a low-power consumption mode or a normal working mode.

2. The CAN card of claim 1, wherein the CAN transceiver module comprises a CAN transceiver chip, a first capacitance unit, a second capacitance unit, a third capacitance unit, and a filter unit;

the first capacitance unit, the second capacitance unit, the third capacitance unit and the filtering unit are all electrically connected with the CAN transceiver chip.

3. The CAN card of claim 2, wherein the first capacitor unit comprises a first capacitor and a second capacitor, a first end of the first capacitor is electrically connected to a first end of the second capacitor, the CAN transceiver chip and a first dc power supply, respectively, and a second end of the first capacitor is electrically connected to a second end of the second capacitor and is grounded.

4. The CAN card of claim 2, wherein the second capacitor unit includes a third capacitor and a fourth capacitor, a first end of the third capacitor is electrically connected to the first end of the fourth capacitor, the CAN transceiver chip, and a second dc power supply, and a second end of the third capacitor is electrically connected to the second end of the fourth capacitor and grounded.

5. The CAN card of claim 2, wherein the third capacitor unit includes a fifth capacitor and a sixth capacitor, a first end of the fifth capacitor is electrically connected to the first end of the sixth capacitor, the CAN transceiver chip, and a third dc power supply, and a second end of the fifth capacitor is electrically connected to the second end of the sixth capacitor and connected to ground.

6. The CAN card of claim 2 wherein the filter unit includes a first magnetic bead, a second magnetic bead, a seventh capacitance, and an eighth capacitance;

the first end of the seventh capacitor is electrically connected with the first end of the first magnetic bead and the CAN receiving and dispatching chip respectively, the second end of the seventh capacitor is electrically connected with the first end of the second magnetic bead and the CAN receiving and dispatching chip respectively, the first end of the eighth capacitor is electrically connected with the second end of the first magnetic bead and the fourth direct current power supply respectively, and the second end of the eighth capacitor is electrically connected with the second end of the second magnetic bead and grounded.

7. The CAN card of claim 2 wherein the CAN transceiver chip is model ADM3057EBRWZ.

8. The CAN card of any one of claims 1-7 further comprising an anti-tamper unit, a first end of the anti-tamper unit being electrically connected to the CAN transceiver module and a second end of the anti-tamper unit being electrically connected to the CAN output port.

9. The CAN card of claim 8 wherein the anti-tamper element comprises a common mode inductance, a ninth capacitance, and a tenth capacitance, a first coil of the common mode inductance being connected in series between the CAN transceiver module and the CAN output port, a second coil of the common mode inductance being connected in series between the CAN transceiver module and the CAN output port, a first end of the ninth capacitance being electrically connected to the second coil of the common mode inductance, a first end of the tenth capacitance being electrically connected to the first coil of the common mode inductance, a second end of the ninth capacitance being electrically connected to the second end of the tenth capacitance and being grounded.

10. Signal conversion device, characterized by comprising a CAN card according to any of claims 1-9.