A CAN bus data acquisition device supporting redundant interlocking

Abstract

The present application belongs to the technical field of programmable PLC controllers and relates to a CAN bus data acquisition device supporting redundant interlocking, comprising: a first valve control plate, a second valve control plate, and a valve; the first valve control plate comprising: a first control assembly and a first interlock assembly connected in sequence; the second valve control plate comprising: a second control assembly and a second interlock assembly connected in sequence; the first control assembly and the second interlock assembly are connected, the first interlock assembly and the second control assembly are connected, and both the first interlock assembly and the second interlock assembly are connected to the valve; when the first control assembly detects a fault in the second valve control plate, the first control assembly changes the state of the second interlock assembly; or when the second control assembly detects a fault in the first valve control plate, the second control assembly changes the state of the first interlock assembly, so that either the first interlock assembly or the second interlock assembly is connected to the valve at the same time. The present application can implement a redundant interlocking function.

Description

Technical Field

[0001] The present application relates to the technical field of programmable PLC controllers, and in particular to a CAN bus data acquisition device supporting redundant interlocking. Background Art

[0002] With the development of technology, CAN bus data communication technology has been widely used in many monitoring systems due to its high real-time performance and relatively long transmission distance. Especially with the vigorous development of my country's Industrial Internet construction and the increasingly complete industrial chain of industrial control chips, hardware, software, etc. that the Industrial Internet platform relies on, CAN bus data communication technology has been increasingly expanded to various fields.

[0003] In the existing technology, CAN bus data acquisition devices are mainly used in industrial control fields such as military and aerospace, and their application in civilian fields has not yet been popularized. Moreover, since the structure of the CAN bus data acquisition device does not implement a redundant interlocking function, when the CAN bus data acquisition device fails, it is necessary to send someone to the site to replace the acquisition device. During this period, the acquisition device cannot collect data in real time, and the data collection work cannot be carried out continuously and effectively. Therefore, it has not yet been widely promoted and applied. Summary of the Invention

[0004] Based on this, it is necessary to provide a CAN bus data acquisition device that supports redundant interlocking to address the above technical problems and realize the redundant interlocking function.

[0005] A CAN bus data acquisition device supporting redundant interlocking includes: a first valve control board, a second valve control board and a valve;

[0006] The first valve control plate includes: a first control assembly and a first interlock assembly connected in sequence; the second valve control plate includes: a second control assembly and a second interlock assembly connected in sequence; the first control assembly is connected to the second interlock assembly, the first interlock assembly is connected to the second control assembly, and the first interlock assembly and the second interlock assembly are both connected to the valve;

[0007] When the first control component detects that the second valve control plate has failed, the first control component changes the state of the second interlock component, or when the second control component detects that the first valve control plate has failed, the second control component changes the state of the first interlock component, so that the first interlock component or the second interlock component is connected to the valve at the same time.

[0008] In one embodiment, the first interlock assembly includes: a first control relay, a first solid-state relay, and a first contact relay; the second interlock assembly includes: a second control relay, a second solid-state relay, and a second contact relay;

[0009] The first solid-state relay, the second control relay and the second contact relay are all connected to the first control component, and the second solid-state relay, the first control relay and the first contact relay are all connected to the second control component.

[0010] In one embodiment, the first control component and the second control component each include: an MCU processing unit, a power processing unit, and a power output adapter unit connected in sequence;

[0011] The power output adapter unit of the first control component is connected to the first interlocking component, and the power output adapter unit of the second control component is connected to the second interlocking component.

[0012] In one embodiment, the power output transfer unit includes: a Darlington transistor, a diode, and an optical coupler;

[0013] The Darlington tube and diode of the first control component are connected to the first interlock component to provide power to the first interlock component and prevent damage to the first interlock component; the optocoupler of the first control component is connected to the second interlock component to determine the fault of the second valve control board;

[0014] The Darlington tube and diode of the second control component are connected to the second interlock component to provide power to the second interlock component and prevent damage to the second interlock component; the optocoupler of the second control component is connected to the first interlock component to determine the fault of the first valve control board.

[0015] In one embodiment, the first control component and the second control component further include: a CAN communication unit;

[0016] The CAN communication unit is connected to the MCU processing unit and the power processing unit at the same time.

[0017] In one embodiment, the CAN communication unit includes: a CAN transceiver;

[0018] The CAN transceiver is connected to the MCU processing unit so that the MCU processing unit can communicate with upper layer devices.

[0019] In one embodiment, the power processing unit includes: a DC;

[0020] The DC of the first control component is connected to the MCU processing unit of the first control component, the CAN communication unit of the first control component and the first interlock component, so as to be used for the isolated power supply of the MCU processing unit of the first control component, the isolated power supply of the CAN communication unit of the first control component and the non-isolated power supply of the first interlock component;

[0021] The DC of the second control component is connected to the MCU processing unit of the second control component, the CAN communication unit of the second control component and the second interlock component to be used for isolated power supply of the MCU processing unit of the second control component, isolated power supply of the CAN communication unit of the second control component and non-isolated power supply of the second interlock component.

[0022] In one embodiment, the first control component and the second control component further include: an input voltage acquisition unit and an output voltage acquisition unit;

[0023] The input voltage acquisition unit and the output voltage acquisition unit are both connected to the MCU processing unit.

[0024] In one embodiment, the input voltage acquisition unit includes: an input sampling resistor and an input isolation amplifier connected in sequence;

[0025] The input isolation amplifier is connected to the MCU processing unit to achieve input voltage sampling and isolation.

[0026] In one embodiment, the output voltage acquisition unit includes: an output sampling resistor and an output isolation amplifier connected in sequence;

[0027] The output isolation amplifier is connected to the MCU processing unit to achieve output voltage sampling and isolation.

[0028] The above-mentioned CAN bus data acquisition device supporting redundant interlocking is provided with a first valve control board and a second valve control board that serve as redundant backup for each other. A first interlocking component is provided on the first valve control board, and a second interlocking component is provided on the second valve control board, and they are cross-connected to each other, thereby realizing the redundant interlocking function by mutual control. Furthermore, a power output transfer unit is provided to realize the input power voltage transfer function. Furthermore, a CAN communication unit is provided to isolate and protect the communication line CAN bus. In addition, each component of the present application can be implemented using domestically produced components, realizing independent control. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of a CAN bus data acquisition device supporting redundant interlocking in one embodiment;

[0030] Figure 2 A hardware architecture diagram of a valve control board in one embodiment;

[0031] Figure 3 Schematic diagram of the structure of a valve control plate in one embodiment;

[0032] Figure 4 A circuit diagram of an MCU processing unit in one embodiment;

[0033] Figure 5 1. The MCU isolation power supply circuit diagram of the power processing unit in one embodiment, wherein (a) is the MCU isolation power supply, and (b) is the MCU power supply;

[0034] Figure 6 A CAN isolated power supply circuit diagram of a power processing unit in one embodiment;

[0035] Figure 7 A circuit diagram of a power output adapter unit in one embodiment;

[0036] Figure 8 Schematic diagram of the structure of a CAN communication unit in one embodiment;

[0037] Figure 9 A circuit diagram of a CAN communication unit in one embodiment

[0038] Figure 10 is a circuit diagram of an input voltage acquisition unit in one embodiment;

[0039] Figure 11 FIG. 4 is a circuit diagram of an output voltage acquisition unit in an embodiment. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application without creative work are within the scope of protection of this application.

[0041] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, and so on, unless otherwise specifically defined.

[0043] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood in a broad sense. For example, "fix" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two elements or an interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0044] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0045] The present application provides a CAN bus data acquisition device supporting redundant interlocking. In one embodiment, the device includes: a first valve control board, a second valve control board, and a valve.

[0046] The first valve control board includes: a first control component and a first interlocking component connected in sequence, and the first interlocking component includes: a first control relay, a first solid-state relay and a first contact relay.

[0047] The second valve control board includes: a second control component and a second interlocking component connected in sequence, and the second interlocking component includes: a second control relay, a second solid-state relay and a second contact relay.

[0048] Both the first control component and the second control component include: an MCU processing unit, a power processing unit, a power output adapter unit, a CAN communication unit, an input voltage acquisition unit and an output voltage acquisition unit. The MCU processing unit, the power processing unit and the power output adapter unit are connected in sequence, the CAN communication unit is connected to the MCU processing unit and the power processing unit at the same time, the input voltage acquisition unit and the output voltage acquisition unit are both connected to the MCU processing unit, and the power output adapter unit is connected to the MCU processing unit and the output voltage acquisition unit at the same time.

[0049] The MCU processing unit is the core control component. The MCU processing unit of the first valve control board collects signals from the second valve control board for fault monitoring and controls the on / off states of the first control relay and the first contact relay. The MCU processing unit of the second valve control board collects signals from the first valve control board for fault monitoring and controls the on / off states of the second control relay and the second contact relay.

[0050] The power processing unit includes: DC; the DC of the first control component is connected to the MCU processing unit of the first control component, the CAN communication unit of the first control component and the first interlocking component, so as to be used for the isolated power supply of the MCU processing unit of the first control component, the isolated power supply of the CAN communication unit of the first control component and the non-isolated power supply of the first interlocking component; the DC of the second control component is connected to the MCU processing unit of the second control component, the CAN communication unit of the second control component and the second interlocking component, so as to be used for the isolated power supply of the MCU processing unit of the second control component, the isolated power supply of the CAN communication unit of the second control component and the non-isolated power supply of the second interlocking component.

[0051] The power output transfer unit includes a Darlington transistor, a diode, and an optocoupler. The Darlington transistor and diode of the first control component are connected to the first interlocking component to provide power to the first interlocking component and prevent damage to the first interlocking component. The optocoupler of the first control component is connected to the second interlocking component to determine if a fault has occurred in the second valve control board. The Darlington transistor and diode of the second control component are connected to the second interlocking component to provide power to the second interlocking component and prevent damage to the second interlocking component. The optocoupler of the second control component is connected to the first interlocking component to determine if a fault has occurred in the first valve control board. The power output transfer unit enables power supply, data collection, and control without the need for a separate power supply, thus achieving power output transfer.

[0052] The CAN communication unit includes: a CAN transceiver; the CAN transceiver is connected to the MCU processing unit to enable the MCU processing unit to communicate with the upper layer device.

[0053] The input voltage acquisition unit includes: an input sampling resistor and an input isolation amplifier connected in sequence; the input isolation amplifier is connected to the MCU processing unit to achieve input voltage sampling and isolation.

[0054] The output voltage acquisition unit includes: an output sampling resistor and an output isolation amplifier connected in sequence; the output isolation amplifier is connected to the MCU processing unit to achieve output voltage sampling and isolation.

[0055] In the present application, the first control component is simultaneously connected to the first interlock component and the second interlock component (the power output adapter unit of the first control component is connected to the first interlock component, and the MCU processing unit of the first control component is connected to the second interlock component), the second control component is simultaneously connected to the first interlock component and the second interlock component (the MCU processing unit of the second control component is connected to the first interlock component, and the power output adapter unit of the second control component is connected to the second interlock component), and the first interlock component and the second interlock component are both connected to the valve; the first solid-state relay, the second control relay and the second contact relay are all connected to the first control component, and the second solid-state relay, the first control relay and the first contact relay are all connected to the second control component; when the first control component detects that the second valve control plate has a fault, the first control component changes the state of the second interlock component, or when the second control component detects that the first valve control plate has a fault, the second control component changes the state of the first interlock component, so that the first interlock component or the second interlock component is connected to the valve at the same time.

[0056] The above-mentioned CAN bus data acquisition device supporting redundant interlocking is provided with a first valve control board and a second valve control board that serve as redundant backup for each other. A first interlocking component is provided on the first valve control board, and a second interlocking component is provided on the second valve control board, and they are cross-connected to each other, thereby realizing the redundant interlocking function by mutual control. Furthermore, a power output transfer unit is provided to realize the input power voltage transfer function. Furthermore, a CAN communication unit is provided to isolate and protect the communication line CAN bus. In addition, each component of the present application can be implemented using domestically produced components, realizing independent control.

[0057] In a specific embodiment, a CAN bus data acquisition device supporting redundant interlocking is provided. Figure 1 As shown, valve control plate A is the first valve control plate, and valve control plate B is the second valve control plate.

[0058] The redundant operating mechanism is as follows: The power supply circuits of both valve control boards A and B are equipped with control relays (A1, B1) controlled by the counterpart board (the redundant valve control board) to control the power input. Simultaneously, a valve control path requires a solid-state relay (A2, B2) and a contact relay (A3, B3) connected in series to complete the circuit. The solid-state relay is controlled by the board itself, while the contact relay is controlled by the counterpart board. Valve control boards A and B can operate in either hot or cold redundant switching modes. During hot redundant operation, valve control board A serves as the master control to execute the specified valve actuation commands. Valve control board B and its relays cut off the valve output without cutting off the power supply. If valve control board A fails, hot redundant operation immediately switches to valve control board B. During cold redundant operation, valve control board A directly cuts off the power supply to valve control board B via control relay A1. If valve control board A fails subsequently, cold redundant operation switches to valve control board B. When valve control board A is operating normally, regardless of the presence of valve control board B, since the control relays (A1, A3) are in the normally closed state by default, valve control board A can control the output of the valve control signal by controlling relay A1. If valve control board A fails, valve control board B can forcibly control the control relays A1, A3 of valve control board A to open, thereby cutting off the power supply and output of the valve control signal of valve control board A. At this time, the output of the valve control signal is transferred to valve control board B, thus achieving safe redundant switching of the system. The mutual control of the relays between the two boards is electrically isolated by optocouplers, further improving the stability and safety of the system.

[0059] The hardware architecture of valve control board A (or valve control board B) is as follows Figure 2 As shown, the structure is shown as Figure 3 As shown in the figure. After the input DC voltage of the CAN bus data acquisition device passes through the control relay, a portion is stepped down by DC (isolated DC-DC) to power the chip on the board (valve control board), while the remaining portion is output externally through the relay control module. The main control logic is as follows: The CAN bus, which is extended from the upper control box, communicates with the MCU processing unit (main control chip) via a CAN transceiver (CAN isolated transceiver) to transmit control instructions. The main control chip can control the relay to output 28V voltage according to the control instructions. At the same time, the main control chip can also collect the valve position signal and upload it to the upper control box via the CAN bus. All control signals and feedback signals are isolated by optocouplers. At the same time, the board is equipped with an isolation op amp to collect the input power voltage and output voltage.

[0060] A circuit diagram of the MCU processing unit is as follows Figure 4Specifically, the CS32F103CB 32-bit microcontroller from the China Electronics Technology Group Corporation 58th Institute is used. This microcontroller uses the ARM Cortex-M3 32-bit RISC core with a maximum operating frequency of 72MHz, built-in high-speed memory (up to 128K bytes of flash memory and 20K bytes of SRAM), a rich set of enhanced I / O ports, and peripherals connected to two APB buses.

[0061] The MCU isolation power supply circuit and the CAN isolation power supply circuit of the power processing unit are respectively as follows Figure 5 and Figure 6 The CAN interface control module primarily uses 28V, 5V, and 3.3V power supplies. The MCU needs to be completely isolated from external control signals, necessitating an isolated DC-DC module. The module utilizes the domestically produced Jinshengyang WRB2405S-1WR2, WRB2405S-3WR2, and K7805MT-500R4 modules. These modules offer a maximum input voltage of DC36V, fully meeting the product's DC28V±10% requirement. The WRB2405S-1WR2 is a 1W isolated DC-DC-to-5V power supply for isolated power supply of the CAN communication chip; the WRB2405S-3WR2 is a 3W isolated DC-DC-to-5V power supply for 28V to 5V isolated DC-DC power supply of the MCU and its associated systems; and the K7805MT-500R4 is a 500mA non-isolated DC-DC-to-5V power supply for non-isolated relays. The rated operating voltage of the MCU is 3.3V, so an LDO power regulator, AiP1117-33, is used to convert 5V to 3.3V for MCU power supply. The LDO power regulator has the characteristic of small ripple and is more suitable for powering the MCU.

[0062] A circuit diagram of the power output transfer unit is as follows: Figure 7As shown in the figure, the electro-hydraulic valve control sensor node outputs valve control commands in the form of a switch signal for the first-level connected electro-hydraulic valve. The output voltage is 28V ± 15%. The switch output path includes a normally open relay and a normally closed relay. The switch control is implemented by the microcontroller (MCU) outputting an action signal. This control signal increases the drive current through the Darlington diode AIP2003, which then activates the normally open relay coil, generating a 28V output voltage. Furthermore, the switch path incorporates multiple protection measures to safeguard the circuit. A freewheeling diode on the coil side of the normally closed relay prevents damage to the relay coil caused by the high voltage generated when the normally closed relay is de-energized. A high-current protection diode and fuse are located at the end of the output path to prevent external current backflow from damaging the internal circuitry and to prevent switching in the event of excessive output current. The outputs of the two relays are fed back to the MCU via an isolating optocoupler for output fault detection.

[0063] The structural diagram of the CAN communication unit and a circuit diagram are shown as follows: Figure 8 He Ru Figure 9 As shown in the figure, the CAN bus data acquisition device uses a dual-channel CAN bus for communication. The microcontroller communicates with the upper-layer device via a CAN isolation transceiver, uploading the arrival signal to the upper-layer device in a specified message format. The node also receives action instructions from the upper-layer device to the control board. The control board sensor node contains two redundant CAN signal paths. Since the microcontroller integrates two CAN controllers, only the CAN transceiver circuit needs to be designed. Xinlite's SIT1050ISO is a capacitively isolated CAN repeater that conforms to the ISO11898 standard. It contains multiple logic input and output buffers separated by a silicon dioxide (SiO2) insulation barrier and is capable of differential signal transmission between the bus and the CAN protocol controller. The CAN bus uses the SIT1050ISO capacitively isolated CAN repeater, and a 120-ohm termination resistor is added at the end to reduce signal reflection interference.

[0064] A circuit diagram of the input voltage acquisition unit is as follows: Figure 10As shown in the figure. To detect input power supply voltage fluctuations, a power supply voltage acquisition circuit is designed. The front end uses a resistor divider to sample the power supply voltage. After input into an isolation amplifier, it undergoes secondary amplification and adjustment before being fed into the MCU's AD sampling circuit, achieving electrical isolation of the input voltage sampling. To maintain measurement accuracy within ±2%, a 1% precision sampling resistor is used in conjunction with the high-precision isolation amplifier NSI1300 to amplify the power supply voltage to a range of 0-3.3V before inputting it into the MCU's 12-bit ADC. The isolation amplifier will be the domestically produced NSI1300D025. The NSI1300 is a high-performance isolation amplifier that separates the output and input based on capacitive isolation technology, offering an isolation voltage of up to 5000V (RMS). The device has a linear differential input signal range of ±250mV (±320mV full scale).

[0065] A circuit diagram of the output voltage acquisition unit is as follows: Figure 11 To monitor the output voltage, a corresponding output voltage acquisition circuit is designed for each output. Each output voltage is amplified twice by an isolation amplifier to avoid mutual interference between the outputs. Finally, the ADC circuit of the MCU performs the acquisition calculation to complete the acquisition of each output voltage.

[0066] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A CAN bus data acquisition device supporting redundant interlocking, characterized in that: include: a first valve control plate, a second valve control plate, and a valve; The first valve control plate includes: a first control assembly and a first interlock assembly connected in sequence; the second valve control plate includes: a second control assembly and a second interlock assembly connected in sequence; the first control assembly is connected to the second interlock assembly, the first interlock assembly is connected to the second control assembly, and the first interlock assembly and the second interlock assembly are both connected to the valve; When the first control component detects that the second valve control plate has failed, the first control component changes the state of the second interlock component, or when the second control component detects that the first valve control plate has failed, the second control component changes the state of the first interlock component, so that the first interlock component or the second interlock component is connected to the valve at the same time; The first control component and the second control component both include: an MCU processing unit, a power processing unit, and a power output adapter unit connected in sequence; The power output adapter unit of the first control component is connected to the first interlocking component, and the power output adapter unit of the second control component is connected to the second interlocking component; The power output transfer unit includes: Darlington tube, diode and optocoupler; The Darlington tube and diode of the first control component are connected to the first interlock component to provide power to the first interlock component and prevent damage to the first interlock component; the optocoupler of the first control component is connected to the second interlock component to determine the fault of the second valve control board; The Darlington tube and diode of the second control component are connected to the second interlock component to provide power to the second interlock component and prevent damage to the second interlock component; the optocoupler of the second control component is connected to the first interlock component to determine the fault of the first valve control board; The first interlock assembly includes: a first control relay, a first solid-state relay, and a first contact relay; the second interlock assembly includes: a second control relay, a second solid-state relay, and a second contact relay; The first solid-state relay, the second control relay, and the second contact relay are all connected to the first control component, and the second solid-state relay, the first control relay, and the first contact relay are all connected to the second control component; The first solid-state relay, the first contact relay and the valve are connected in sequence, and the second solid-state relay, the second contact relay and the valve are connected in sequence.

2. The CAN bus data acquisition device supporting redundant interlocking according to claim 1, characterized in that: The first control component and the second control component also include: a CAN communication unit; The CAN communication unit is connected to the MCU processing unit and the power processing unit at the same time.

3. The CAN bus data acquisition device supporting redundant interlocking according to claim 2, characterized in that: The CAN communication unit includes: a CAN transceiver; The CAN transceiver is connected to the MCU processing unit so that the MCU processing unit can communicate with upper layer devices.

4. The CAN bus data acquisition device supporting redundant interlocking according to claim 3, characterized in that: The power processing unit includes: DC; The DC of the first control component is connected to the MCU processing unit of the first control component, the CAN communication unit of the first control component and the first interlock component, so as to be used for the isolated power supply of the MCU processing unit of the first control component, the isolated power supply of the CAN communication unit of the first control component and the non-isolated power supply of the first interlock component; The DC of the second control component is connected to the MCU processing unit of the second control component, the CAN communication unit of the second control component and the second interlock component to be used for isolated power supply of the MCU processing unit of the second control component, isolated power supply of the CAN communication unit of the second control component and non-isolated power supply of the second interlock component.

5. The CAN bus data acquisition device supporting redundant interlocking according to any one of claims 1 to 4, characterized in that: The first control component and the second control component also include: an input voltage acquisition unit and an output voltage acquisition unit; The input voltage acquisition unit and the output voltage acquisition unit are both connected to the MCU processing unit.

6. The CAN bus data acquisition device supporting redundant interlocking according to claim 5, characterized in that: The input voltage acquisition unit includes: an input sampling resistor and an input isolation amplifier connected in sequence; The input isolation amplifier is connected to the MCU processing unit to achieve input voltage sampling and isolation.

7. The CAN bus data acquisition device supporting redundant interlocking according to claim 6, characterized in that: The output voltage acquisition unit includes: an output sampling resistor and an output isolation amplifier connected in sequence; The output isolation amplifier is connected to the MCU processing unit to achieve output voltage sampling and isolation.

Images