Hardware-in-the-loop interface board card

Abstract

The invention belongs to the technical field of hardware-in-loop simulation testing, and particularly relates to a hardware-in-loop interface board card. According to the hardware-in-the-loop interface board card disclosed by the invention, mutual conversion between a simulation machine input / output low-voltage signal and a controller output / input high-voltage signal is realized through a simulation machine signal photoelectric conversion sending circuit and a controller signal photoelectric conversion sending circuit in the signal conditioning module; the low-voltage signal output by the simulation machine interface can indirectly control the high-voltage signal input into the controller interface, and the high-voltage signal output by the controller interface can be converted into the low-voltage signal matched with the simulation machine interface, so that the problems of specification difference and signal matching difference between the IO interface and the controller interface are solved; the low-voltage simulator system is electrically isolated from the high-voltage controller system, so that the influence of the high-voltage controller on the simulator is avoided; and in the aspect of structural design, the hardware-in-the-loop interface board card is divided into an upper layer board and a lower layer board, so that the occupied area is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hardware-in-the-loop simulation testing, and in particular relates to a hardware-in-the-loop interface board. Background Art

[0002] Hardware-in-the-loop simulation testing technology is a technical means to test and analyze the performance of the controller; specifically, in a closed loop, the controller under test receives the state of the controlled object and issues a control command, then obtains feedback from the controlled object and issues a control command again to form a test closed loop. By setting different states of the object under test, it is tested whether the controller can correctly handle different working conditions and whether its functions can work normally. Hardware-in-the-loop simulation overcomes the shortcomings of traditional methods that require testing in a real environment, and can simulate the operation and fault status of the controlled object as needed. The test has good repeatability and can be tested under extreme conditions to achieve complete performance prediction and analysis of the entire control system, thereby shortening the development cycle and saving personnel, equipment, and capital investment.

[0003] When performing hardware-in-the-loop simulation testing, it is usually necessary to build a hardware-in-the-loop simulation model, replace the real controlled object with the virtual controlled object simulated by the simulator, receive all control instructions, and simulate all status information to return to the real controller to form a test closed loop. This requires designing an IO interface between the simulator and the controller to realize the interaction between the virtual controlled object and the controller, and to send and receive information according to the real line form and protocol, so that the simulator is connected to the controller through the line in the same form as the real object to realize signal reception and transmission; however, the IO interface of the existing simulator RTLAB and the controller interface often have specification differences and different signal matching of the interface transmission, making it difficult for the simulator to be directly connected to the controller, resulting in the corresponding control instructions cannot be transmitted or accurately identified, affecting the normal progress of the hardware-in-the-loop simulation test. Summary of the invention

[0004] The purpose of the present invention is to provide a hardware-in-the-loop interface board to solve the problem in the prior art that the simulation machine is difficult to interface with the controller due to specification differences and the signal matching of the interface transmission is different, resulting in the inability to transmit or accurately identify the corresponding control instructions of the hardware-in-the-loop simulation test.

[0005] In order to achieve the above object, the present invention provides a hardware-in-the-loop interface card, which is provided with a simulation machine signal input terminal and a simulation machine signal output terminal;

[0006] The hardware-in-the-loop interface board is also provided with various functional modules, wherein the functional modules include a signal conditioning module, and the signal conditioning module includes a simulation machine signal photoelectric conversion and transmission circuit;

[0007] The simulation machine signal photoelectric conversion and sending circuit includes a first trigger switch, a first photocoupler, a relay, a first power supply circuit for supplying power to the input end of the first photocoupler, and a second power supply circuit for supplying power to the relay coil. One end of the first trigger switch is used to connect to the simulation machine through the simulation machine signal input end, and the other end is connected to the first power supply circuit, and is used to turn on the first power supply circuit according to the low-voltage signal output by the simulation machine to turn on the first photocoupler; the first photocoupler output end is connected to the second power supply circuit, and is used to turn on the second power supply circuit when the first photocoupler is turned on to control the relay to close; the relay is used to connect to the high-voltage circuit at the controller through the simulation machine signal output end, so as to connect or disconnect the high-voltage circuit at the controller according to the opening and closing of the relay, and generate the high-voltage input signal of the controller accordingly.

[0008] The beneficial effects of the above technical solution are: through the simulator signal optoelectronic conversion and sending circuit in the signal conditioning module, the mutual conversion between the low-voltage signal output by the simulator and the high-voltage signal input by the controller is realized, so that the low-voltage signal output by the simulator can indirectly control the high-voltage signal of the input controller, solving the problem of specification differences and signal matching between the IO interface of the simulator RTLAB and the controller interface, and electrically isolating the low-voltage simulator system from the high-voltage controller system to avoid the influence of the high-voltage controller on the low-voltage simulator.

[0009] Furthermore, it also includes a controller signal input terminal and a controller signal output terminal;

[0010] The signal conditioning module also includes a controller signal photoelectric conversion and sending circuit, which includes a second photoelectric coupler and a third power supply circuit for supplying power to the input end of the second photoelectric coupler; the third power supply circuit is connected to the controller through the controller signal input end, and is used to be turned on according to the high-voltage output signal of the controller to turn on the second photoelectric coupler; the second photoelectric coupler output end is used to be connected to the simulation machine through the controller signal output end, and to generate a low-voltage input signal of the simulation machine according to the conduction status of the second photoelectric coupler for transmission to the simulation machine.

[0011] The beneficial effects of the above technical solution are: through the controller signal optoelectronic conversion and sending circuit in the signal conditioning module, the mutual conversion between the high-voltage signal input by the controller and the low-voltage signal output by the simulator is realized, so that the high-voltage signal output by the controller can be converted into a low-voltage level signal that can be accurately recognized by the simulator. This not only solves the problem of specification differences and signal matching between the IO interface of the simulator RTLAB and the controller interface, but also electrically isolates the low-voltage simulator system from the high-voltage controller system, avoiding the influence of the high-voltage controller on the low-voltage simulator.

[0012] Furthermore, the functional module also includes a fiber optic communication module, which includes a first fiber optic interface for connecting to the fiber optic interface of the simulation machine and a second fiber optic interface for connecting to the fiber optic interface of the controller, and is used to transmit relay protection signals between the simulation machine and the controller via optical fiber.

[0013] The beneficial effects of the above technical solution are: facilitating the transmission of relay protection signals between the simulator and the controller in the form of optical signals, thereby meeting the requirements of the power system for large transmission volume, strong anti-interference performance, and high transmission quality of relay protection communication data.

[0014] Furthermore, the functional module also includes a power module and an EMC module; the power module is used to perform level conversion on the input voltage to provide the corresponding required working voltage to other functional modules; the EMC module is used to perform surge protection and common mode filtering on the external power input terminal.

[0015] Furthermore, the hardware-in-the-loop interface board includes an upper board and a lower board, and each functional module is arranged on the upper board and the lower board respectively;

[0016] The upper layer board and the lower layer board are spliced ​​through an interface connector and perform signal transmission.

[0017] The beneficial effects of the above technical solution are: reducing the footprint of the hardware-in-the-loop interface board and facilitating the miniaturization of the hardware-in-the-loop interface board.

[0018] Furthermore, the functional modules are arranged in the following manner: the power module, the signal conditioning module and the EMC module are arranged on the lower board, and the optical fiber communication module is arranged on the upper board.

[0019] The beneficial effects of the above technical solution are: it can reduce the mutual influence between the functional modules and facilitate the operation and maintenance of the hardware-in-the-loop interface board.

[0020] Furthermore, the interfaces corresponding to the simulation machine signal input terminal and the controller signal output terminal are uniformly arranged on the side of the hardware-in-the-loop interface board close to the simulation machine, and the interfaces corresponding to the controller signal input terminal and the simulation machine signal output terminal are uniformly arranged on the side of the board close to the controller.

[0021] The beneficial effects of the above technical solution are: shortening the distance between the relevant corresponding wiring terminals as much as possible, facilitating the signal interaction between the simulator and the controller and reducing the complexity of wiring.

[0022] Furthermore, the controller signal photoelectric conversion and sending circuit also includes a differential amplifier circuit for converting the low-voltage input signal of the simulator into a differential signal input into the simulation model in the host computer, so as to be forwarded to the host computer through the simulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the connection structure of the hardware-in-the-loop interface card in the hardware-in-the-loop test system in the hardware-in-the-loop interface card embodiment of the present invention;

[0024] Figure 2 It is a front view of a hardware-in-the-loop interface card in an embodiment of the hardware-in-the-loop interface card of the present invention;

[0025] Figure 3 It is a basic functional module and operation schematic diagram of the hardware-in-the-loop interface card in the hardware-in-the-loop interface card embodiment of the present invention;

[0026] Figure 4 This is a circuit structure example diagram of a simulation machine signal photoelectric conversion and transmission circuit in a hardware-in-the-loop interface card in an embodiment of the hardware-in-the-loop interface card of the present invention;

[0027] Figure 5 It is a schematic diagram of the principle of the photoelectric conversion and sending circuit of the simulation machine signal in the hardware-in-the-loop interface card in the hardware-in-the-loop interface card embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the principle of the controller signal photoelectric conversion and transmission circuit in the hardware-in-the-loop interface card in the hardware-in-the-loop interface card embodiment of the present invention;

[0029] Figure 7 This is a circuit structure example diagram of a controller signal photoelectric conversion and sending circuit in a hardware-in-the-loop interface card in an embodiment of the hardware-in-the-loop interface card of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Hardware-in-the-loop interface card implementation example

[0032] This embodiment provides a technical solution for a hardware-in-the-loop interface card. The location of the hardware-in-the-loop interface card in the hardware-in-the-loop test system is shown in the following figure. Figure 1 As shown; the board is provided with a simulation machine signal input terminal and a simulation machine signal output terminal, which are respectively used to input the simulation machine signal into the board and input the simulation machine signal after the board is converted into the controller; the simulation machine in this embodiment is an RT-LAB simulation machine. In this embodiment, the board is also provided with a controller signal input terminal and a controller signal output terminal, which are respectively used to input the controller signal into the board and input the controller signal after the board is converted into the simulation machine; in order to facilitate the signal interaction between the simulation machine and the controller and reduce the complexity of wiring, refer to Figure 2The interfaces corresponding to the simulator signal input terminal and the controller signal output terminal (i.e., the terminals for inputting relevant input signals to the simulator and outputting simulator output signals) are uniformly arranged on the side of the hardware-in-the-loop interface card close to the simulator, and the interfaces corresponding to the controller signal input terminal and the simulator signal output terminal (i.e., the terminals for inputting relevant input signals to the controller and outputting controller output signals) are uniformly arranged on the side of the card close to the controller; Figure 2 The example given is a front view of the board. Due to the problem of fiber optic connector model specifications in the actual PCB layout, a fiber optic head for receiving signals from the RTLAB simulator (i.e., the interface corresponding to the simulator signal input end) is set on the side of the board close to the controller.

[0033] The hardware-in-the-loop interface board is also equipped with various functional modules, such as Figure 3 As shown, the functional module includes a signal conditioning module, which includes a simulator signal photoelectric conversion and sending circuit for converting the low voltage signal output by the simulator into a 220V high voltage signal of the corresponding controller.

[0034] Reference Figure 4 The simulator signal photoelectric conversion and transmission circuit converts the low voltage signal output by the simulator into a 220V high voltage signal of the corresponding controller. The principle and process are as follows: Figure 5 The simulation machine signal photoelectric conversion and sending circuit specifically includes a first trigger switch, a first photocoupler, a relay, a first power supply circuit for supplying power to the input end of the first photocoupler, and a second power supply circuit for supplying power to the relay coil; in this embodiment, the first trigger switch is a transistor located at the signal input end of the simulation machine, one end of which is used to connect to the simulation machine through the signal input end of the simulation machine, and the other end is connected to the first power supply circuit, and is used to turn on the first power supply circuit according to the low-voltage level signal output by the simulation machine to turn on the first photocoupler; the output end of the first photocoupler is connected to the second power supply circuit, and is used to turn on the second power supply circuit when the first photocoupler is turned on to control the relay to close; the relay is used to connect to the high-voltage circuit at the controller through the signal output end of the simulation machine, so as to turn on or off the high-voltage circuit at the controller according to the opening and closing of the relay, and generate the high-voltage input signal of the controller accordingly.

[0035] It can be seen that the specific working process of the simulator signal photoelectric conversion and transmission circuit when the hardware-in-the-loop test system is tested is as follows: first, the simulator RTLAB opens a TTL level signal of 1.8V to 5V, and the transistor located at the simulator signal input end is turned on accordingly. At this time, the first power supply circuit for powering the optocoupler is turned on, and the power supply is added to the power generation diode at the input end of the optocoupler (hereinafter referred to as the optocoupler) through a current limiting resistor to make it emit light, and the phototransistor at the output end of the optocoupler is turned on. At this time, the second power supply circuit for powering the relay coil in the subsequent circuit is turned on, and the relay working circuit is closed, controlling the 220V circuit of the subsequent controller to be turned on; in this embodiment, the transistor (i.e., the first trigger switch) arranged at the simulator signal input end plays the role of switching and protecting the pins of the previous simulator chip, and the optocoupler and the relay play the role of isolation control, isolating the low-voltage simulator system from the high-voltage controller system. Therefore, the simulator signal photoelectric conversion and transmission circuit mentioned above in this embodiment not only transmits the electrical signal through photoelectric conversion, but also realizes the function of indirectly controlling the 220V high-voltage signal through the relay with the low-voltage signal output by the single-chip microcomputer (i.e., the simulator).

[0036] In this embodiment, the signal conditioning module also includes a controller signal photoelectric conversion and transmission circuit, which is used to convert the high voltage signal output by the controller into a low voltage signal input by the simulator RTLAB;

[0037] The controller signal photoelectric conversion and sending circuit converts the high voltage signal from the controller into the low voltage signal input by the simulator RTLAB. Figure 6 ; The controller signal photoelectric conversion and transmission circuit specifically includes a second photocoupler and a third power supply circuit for supplying power to the input end of the second photocoupler; the third power supply circuit is connected to the controller through the controller signal input end, and is used to be turned on according to the high-voltage output signal of the controller to turn on the second photocoupler; the second photocoupler output end is used to be connected to the simulator through the controller signal output end, and to generate a low-voltage input signal of the simulator according to the conduction status of the second photocoupler for transmission to the simulator. The specific circuit example is as follows Figure 7 shown.

[0038] The above-mentioned controller signal photoelectric conversion and transmission circuit also uses a photocoupler to realize the transmission and isolation of the high voltage signal output by the controller and the low voltage signal input by the simulator RTLAB. The entire signal transmission process is completed through the conversion of "electric → optical → electric". At the same time, considering that the simulation model built in the host computer connected to the simulator is controlled by a differential signal, in this embodiment, the controller signal photoelectric conversion and transmission circuit also includes a differential amplifier circuit, which is used to convert the low voltage input signal generated by the simulator into a differential signal input to the simulation model in the host computer, so as to forward it to the host computer through the simulator, that is, the single-ended signal output by the controller is converted into a differential signal for inputting the simulation model in the host computer through the differential amplifier circuit.

[0039] To sum up, this embodiment realizes the mutual conversion between the low-voltage signal switched in / out of the simulator and the high-voltage signal switched in / out of the controller through the simulator signal optoelectronic conversion and sending circuit and the controller signal optoelectronic conversion and sending circuit in the signal conditioning module, so that the low-voltage signal output by the simulator can indirectly control the 220V high-voltage signal, and the high-voltage signal output by the controller can be converted into a low-voltage level signal that can be accurately recognized by the simulator. This not only solves the problem of specification differences and signal matching between the IO interface of the simulator RTLAB and the controller interface, but also electrically isolates the low-voltage simulator system from the high-voltage controller system, avoiding the influence of the high-voltage controller on the low-voltage simulator.

[0040] In this embodiment, the functional module also includes an optical fiber communication module, which includes a first optical fiber interface for connecting to the optical fiber interface of the simulator and a second optical fiber interface for connecting to the optical fiber interface of the controller, and is used to transmit the relay protection signal between the simulator and the controller through optical fiber; the optical fiber communication module replaces the DB37 serial port with an optical fiber interface, which can meet the requirements of large transmission volume, strong anti-interference performance, and high transmission quality for relay protection communication data in the power system. Since the method of how the simulator and the controller end perform photoelectric / electro-optical conversion on the relay protection signal belongs to the prior art, it will not be repeated here.

[0041] Reference Figure 3, the functional module also includes a power module and an EMC module; wherein, the power module is used to perform level conversion on the input voltage to provide the corresponding required working voltage to other functional modules, which is related to the stability of the entire interface board; specifically, when the hardware-in-the-loop interface board is running, the power module is connected to an external 220V power supply, and provides different levels of power supply voltage to other modules through level conversion; the EMC module is used to perform surge protection and common-mode filtering on the power input end, that is, considering the electromagnetic compatibility problem, the switching power supply is designed with EMC, and the external power input end (that is, the input end corresponding to the external power supply inputting electric energy to the power module) is protected by protection first and then filtering, and filtering measures are also taken for the 24V, ±15V, and 3.3V voltage output ends converted and output by the power module.

[0042] Reference Figure 2 , the upper right corner of the hardware-in-the-loop interface board (i.e., the side close to the simulator) is provided with the simulator RTLAB signal optical fiber communication interface; in terms of structural design, the hardware-in-the-loop interface board includes an upper board and a lower board, and each functional module is arranged on the upper board and the lower board respectively to reduce the footprint of the hardware-in-the-loop interface board; the board is placed between the simulator and the controller, and the shell adopts an electromagnetic shielding structure; the upper board and the lower board are spliced ​​through an interface connector and transmit signals. Considering the board design principles such as higher voltage functional modules are distributed together, lower voltage functional modules are distributed together, control circuits that may need to be frequently modified are distributed in the upper layer, and basic functional modules (functional modules that will not be modified basically) are distributed in the lower layer, in a preferred embodiment, in order to reduce the mutual influence between the functional modules and facilitate the operation and maintenance of the hardware-in-the-loop interface board, the arrangement of the functional modules is as follows: the power module, the signal conditioning module and the EMC module are arranged on the lower board, and the optical fiber communication module is arranged on the upper board.

[0043] The present invention has the following characteristics:

[0044] 1) Through the simulator signal optoelectronic conversion and sending circuit and the controller signal optoelectronic conversion and sending circuit in the signal conditioning module, the mutual conversion between the low-voltage signal switched in / out of the simulator and the high-voltage signal switched in / out of the controller is realized, so that the low-voltage signal output by the simulator can indirectly control the 220V high-voltage signal, and the high-voltage signal output by the controller can be converted into a low-voltage level signal that the simulator can accurately identify. This not only solves the problem of specification differences and signal matching between the IO interface of the simulator RTLAB and the controller interface, but also electrically isolates the low-voltage simulator system from the high-voltage controller system, avoiding the influence of the high-voltage controller on the low-voltage simulator.

[0045] 2) In terms of structural design, the hardware-in-the-loop interface board is divided into an upper board and a lower board, and each functional module is arranged on the upper board and the lower board respectively, which reduces the footprint of the hardware-in-the-loop interface board.

[0046] 3) The interfaces corresponding to the simulator signal input terminal and the controller signal output terminal (i.e., the terminals used to input relevant input signals to the simulator and output simulator output signals) are uniformly arranged on the side of the hardware-in-the-loop interface board close to the simulator, and the interfaces corresponding to the controller signal input terminal and the simulator signal output terminal (i.e., the terminals used to input relevant input signals to the controller and output simulator output signals) are uniformly arranged on the side of the board close to the controller, which facilitates the signal interaction between the simulator and the controller and reduces the complexity of wiring.

[0047] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, but do not constitute a limitation to the present invention.

Claims

1. A hardware-in-the-loop interface card, characterized in that: A simulation machine signal input terminal and a simulation machine signal output terminal are provided; The hardware-in-the-loop interface board is also provided with various functional modules, wherein the functional modules include a signal conditioning module, and the signal conditioning module includes a simulation machine signal photoelectric conversion and transmission circuit; The simulation machine signal photoelectric conversion and sending circuit includes a first trigger switch, a first photocoupler, a relay, a first power supply circuit for supplying power to the input end of the first photocoupler, and a second power supply circuit for supplying power to the relay coil. One end of the first trigger switch is used to connect to the simulation machine through the simulation machine signal input end, and the other end is connected to the first power supply circuit, and is used to turn on the first power supply circuit according to the low-voltage signal output by the simulation machine to turn on the first photocoupler; the first photocoupler output end is connected to the second power supply circuit, and is used to turn on the second power supply circuit when the first photocoupler is turned on to control the relay to close; the relay is used to connect to the high-voltage circuit at the controller through the simulation machine signal output end, so as to connect or disconnect the high-voltage circuit at the controller according to the opening and closing of the relay, and generate the high-voltage input signal of the controller accordingly.

2. The hardware-in-the-loop interface card according to claim 1, characterized in that: Also includes a controller signal input terminal and a controller signal output terminal; The signal conditioning module also includes a controller signal photoelectric conversion and sending circuit, which includes a second photoelectric coupler and a third power supply circuit for supplying power to the input end of the second photoelectric coupler; the third power supply circuit is connected to the controller through the controller signal input end, and is used to be turned on according to the high-voltage output signal of the controller to turn on the second photoelectric coupler; the second photoelectric coupler output end is used to be connected to the simulation machine through the controller signal output end, and to generate a low-voltage input signal of the simulation machine according to the conduction status of the second photoelectric coupler for transmission to the simulation machine.

3. The hardware-in-the-loop interface card according to claim 1 or 2, characterized in that: The functional module also includes a fiber optic communication module, which includes a first fiber optic interface for connecting to the fiber optic interface of the simulation machine and a second fiber optic interface for connecting to the fiber optic interface of the controller, and is used to transmit relay protection signals between the simulation machine and the controller via optical fiber.

4. The hardware-in-the-loop interface card according to claim 3, characterized in that: The functional module also includes a power module and an EMC module; the power module is used to perform level conversion on the input voltage to provide the corresponding required working voltage to other functional modules; the EMC module is used to perform surge protection and common mode filtering on the external power input terminal.

5. The hardware-in-the-loop interface card according to claim 4, characterized in that: The hardware-in-the-loop interface board includes an upper board and a lower board, and each functional module is arranged on the upper board and the lower board respectively; The upper layer board and the lower layer board are spliced ​​through an interface connector and perform signal transmission.

6. The hardware-in-the-loop interface card according to claim 5, characterized in that: The functional modules are arranged in the following manner: the power module, the signal conditioning module and the EMC module are arranged on the lower board, and the optical fiber communication module is arranged on the upper board.

7. The hardware-in-the-loop interface card according to claim 1 or 2, characterized in that: The interfaces corresponding to the simulation machine signal input terminal and the controller signal output terminal are uniformly arranged on the side of the hardware-in-the-loop interface board close to the simulation machine, and the interfaces corresponding to the controller signal input terminal and the simulation machine signal output terminal are uniformly arranged on the side of the board close to the controller.

8. The hardware-in-the-loop interface card according to claim 2, characterized in that: The controller signal photoelectric conversion and transmission circuit also includes a differential amplifier circuit for converting the low-voltage input signal of the simulator into a differential signal input into the simulation model in the host computer, so as to be forwarded to the host computer through the simulator.

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