A verification method based on comprehensive simulation of interface circuit

Abstract

The present application provides a verification method based on comprehensive simulation of interface circuits, the verification method comprising: modeling the control drive interface circuit based on parameters to form the entire control loop; simulating and verifying the entire control loop; the present application adopts the comprehensive simulation technology of interface circuits to model and simulate the control instruction circuit, the processing conversion circuit and the execution circuit, shortening the verification cycle while improving the reliability and comprehensiveness of the verification, and has been successfully applied in multiple projects. At the same time, the verification method using comprehensive simulation of interface circuits can solve the system-level design evaluation problem of finished interface circuits; the verification method using comprehensive simulation of interface circuits greatly shortens the iterative verification cycle of finished circuit changes.

Description

Technical Field

[0001] The present application belongs to the technical field of finished product design and verification of electrical control products, and in particular, relates to a verification method based on comprehensive simulation of interface circuits. Background Art

[0002] In a control loop composed of multiple products, the interface circuit comprehensive simulation technology is applied to complete the full-temperature and full-state simulation verification of the control loop during the scheme design stage, saving the verification cost and verification cycle of physical tests.

[0003] Currently, verification of control loops is based on theory and experiments (acceptance test and iron-bird test). The verification cycle is long, the verification status is incomplete, and hidden dangers that are not fully verified will be brought onto the aircraft. Summary of the invention

[0004] In view of the above technical problems, the present application provides a verification method based on comprehensive simulation of interface circuits, the verification method comprising:

[0005] Model the control drive interface circuit based on parameters to form the entire control loop;

[0006] The entire control loop is verified by simulation.

[0007] Preferably, the simulation verification of the entire control loop includes:

[0008] Simulating the entire control loop to obtain simulation results over a full temperature range;

[0009] Based on the simulation results, the parameters are verified and optimized.

[0010] Preferably, simulating the entire control loop to obtain simulation results over a full temperature range includes:

[0011] Simulating the entire control loop based on temperature adjustment device parameters to obtain output signals of various nodes in the entire control loop;

[0012] The simulation result is determined based on the output signals of the respective nodes.

[0013] Preferably, verifying and optimizing the parameters based on the simulation results includes:

[0014] Based on the system indicator requirements, verify whether the signal of each node is optimal;

[0015] If the signal of each node is optimal, the parameter is updated based on the optimal signal.

[0016] Preferably, before the control drive interface circuit is modeled based on the parameters, the method further includes:

[0017] Parameters are determined based on system indicator requirements; wherein the system indicator requirements are requirements specified in the product agreement.

[0018] Preferably, the modeling of the control drive interface circuit based on parameters includes:

[0019] In the simulation software, the control drive interface circuit is modeled based on the parameters.

[0020] Preferably, if the signal of each node is optimal, after updating the parameter based on the optimal signal, the method further includes:

[0021] The entire control loop is verified by simulation based on the updated parameters.

[0022] Preferably, the simulation software includes Multisim software.

[0023] Beneficial technical effects of this application:

[0024] This application uses interface circuit comprehensive simulation technology to model and simulate the control instruction circuit, processing conversion circuit and execution circuit, which shortens the verification cycle while improving the reliability and comprehensiveness of the verification. It has been successfully applied in multiple projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A block diagram of an interface circuit provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of modeling an interface circuit provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of an interface circuit simulation provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of simulation of various states of an interface circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-4This application uses comprehensive interface circuit simulation technology to simulate and verify the full temperature and full state of the control loop, which is a supplement to the system test (ATP experiment and iron bird test) and provides support for the system-level design evaluation of the finished interface circuit in the scheme stage.

[0031] In simulation software (such as Multisim), design and model the control drive interface circuit (see the attached interface circuit block diagram). Figure 1 ), different finished product manufacturers are required to provide detailed parameters of circuit design.

[0032] The simulation software may also be Cadence, Synopsys Saber, or other simulation software, which is not limited here.

[0033] Perform comprehensive (entire path) simulation on the interface circuit and adjust device parameters according to temperature to obtain simulation results over the full temperature range.

[0034] Adjust and optimize the circuit parameters accordingly to improve the product performance of the prototype under ambient temperature conditions, and verify the rationality of the interface circuit and the simulation demonstration of the fault solution.

[0035] It should be noted that the VMC provides a 30mA 15V / ground signal to the flap control box, which is converted into a 28V signal after internal circuit processing and provided to the electromagnetic clutch of the rear flap drive device.

[0036] Among them, according to the actual design circuit, the interface circuit of the aircraft management computer (VMC), the flap control box and the flap drive device is parameter modeled.

[0037] Among them, the powerful simulation function of Multisim software is used to simulate the designed circuit.

[0038] Among them, according to the Multisim circuit simulation results, the output voltage and current of each part are compared with the design indicators to find the optimal design solution.

[0039] In this application, the application is divided into three parts:

[0040] 1. Interface circuit modeling

[0041] Among them, the output development indicators of each product are sorted out (taking the flap control circuit of a certain model as an example): the output voltage and current of the VMC control command circuit (15V / ground (30mA)), the output of the flap control box (output power ≥10W, resistance ≤100Ω), and the flap drive device (current ≤1.875A). According to the circuit diagrams provided by each manufacturer, the simulation software Multisim is used to reasonably select the parameters of each component and perform accurate design modeling, as shown in the attached figure. Figure 2 shown.

[0042] 2. Interface circuit simulation

[0043] Among them, according to the device manual, the value range of device parameters changing with temperature was found, and a large number of circuit simulations with different value parameters were performed (such as the attached Figure 3 shown), optimization analysis, and virtual validation.

[0044] 3. Interface circuit analysis and evaluation

[0045] Among them, according to the simulation analysis results, the compliance of each product development index can be evaluated. At the same time, the system considers the design rationality of the entire control loop (such as the attached Figure 4 shown).

[0046] Among them, the application of comprehensive simulation technology of interface circuits can systematically verify and optimize weak links to ensure optimal product performance; simulation virtual experiments instead of actual circuit debugging can greatly reduce the loss of electronic components; a large number of simulations, optimization analyses and virtual verifications are carried out in terms of high and low temperatures, device tolerances, etc., to reduce the number of iterations in product development and shorten development time; support is provided for the system-level design evaluation of finished interface circuits, which is the first time in the profession to evaluate designed circuits in a non-experimental way.

[0047] In other embodiments of the present application, Figure 1-4 .

[0048] 1. Product specifications require that the VMC output flap retraction / extension command signal is 15V, (30~50)mA; the output signal of the flap control box has a voltage range of 18V~32V, an output power of not less than 10W (single side), a clutch DC resistance of not more than 100Ω, and an inductance of not more than 0.5H; the flap drive device has a voltage range of 18~32VDC, a power of not more than 60W, and an operating current of not more than 1.875A, and a clutch DC resistance of not more than 100Ω.

[0049] 2. When the VMC is designed to output a high level, the optocoupler is turned on to drive the MOSFET to output a 15V / ground high current discrete output signal, which can provide a maximum current output of 400mA to the flap control box. After the flap control box output voltage is divided, it passes through a triode with a magnification of 10 times, and outputs the drive voltage to the rear-end drive device. The electromagnetic clutch of the drive device has an impedance range of 12Ω to 26.6Ω at (-55℃~70℃). The control loop of the control drive interface circuit is shown in the attached figure. Figure 1 shown.

[0050] 3. In the simulation software Multisim, according to the interface circuit design parameters of each product, the control drive interface circuit is designed and modeled, as shown in the attached figure. Figure 2 shown.

[0051] 4. Use simulation tools to design and simulate the control drive interface circuit (see attached Figure 3 As shown), the output signal of each node is obtained and the output signal of each node is analyzed. The signal at the output end of the VMC is 13.2V, -125mA (the current meets the specification requirements), and the signal at the output end of the control box is 25.2V, -984mA (the power is 24.8W, which meets the specification requirements). At the same time, the design circuit is reviewed and it is found that the control box design circuit uses a transistor drive. Conventional high-power drives generally use MOS tubes. After analyzing this transistor, it is found that the amplification factor is β=1.97 / 0.125=15.76. In terms of design parameters, the amplification factor of the transistor is 20 times, and the margin design may be insufficient. In order to avoid extreme situations, the transistor amplification factor is optimized to 80 times. Considering that the current is large, the temperature rise may be high. After comprehensive consideration, BUR51 is selected to replace 3DK020H.

[0052] 5. Compare the design parameters of the components of the control drive interface circuit within the full temperature range to identify temperature-sensitive components. In this design circuit, the impedance of the drive device varies with temperature from 12Ω to 26.6Ω. Based on the impedance variation range, the control drive interface circuit is modeled with variable parameters in the simulation software Multisim, and the output signals under different design parameters are iteratively simulated. The output signals are then verified and evaluated based on specifications or experience.

[0053] 6. After determining the optimal design parameters, produce actual products and conduct joint tests in the laboratory, test and record the standardized output signals, and compare them with the simulation results of the control drive interface circuit (see attached). Figure 4As shown in the figure, the VMC simulation value is (13.2V, -125mA), and the measured value is (13.03V, -113.9mA); the control box simulation value is (25.2V, -984mA), and the measured value is (25.63V, -867mA). After comparative analysis, it is found that the simulation and the measured value are quite close.

[0054] The technical effect of the present application is that the verification method using comprehensive simulation of interface circuits can solve the system-level design evaluation problem of finished interface circuits. The verification method using comprehensive simulation of interface circuits can greatly shorten the iterative verification cycle of finished circuit changes.

[0055] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A verification method based on comprehensive simulation of interface circuit, characterized in that: The verification method comprises: Determine parameters based on system index requirements; wherein the system index requirements are based on the requirements specified in the product agreement; the parameters include the output voltage and current of the VMC control command circuit, the output power and resistance of the flap control box, and the output current of the flap drive device; Modeling the control drive interface circuit based on the parameters to form the entire control loop; wherein the control drive interface circuit includes an interface circuit of the VMC, a flap control box and a flap drive device; Simulating and verifying the entire control loop; The simulation verification of the entire control loop includes: Simulating the entire control loop based on temperature adjustment device parameters to obtain output signals of various nodes in the entire control loop; Determining the simulation result based on the output signal of each node; Based on the system indicator requirements, verify whether the signal of each node is optimal; If the signal of each node is optimal, the parameter is updated based on the optimal signal.

2. The verification method according to claim 1, characterized in that: The control drive interface circuit is modeled based on parameters, including: In the simulation software, the control drive interface circuit is modeled based on the parameters.

3. The verification method according to claim 2, characterized in that: If the signal of each node is optimal, after updating the parameter based on the optimal signal, the method further includes: The entire control loop is verified by simulation based on the updated parameters.

4. The verification method according to claim 3, characterized in that: The simulation software includes Multisim software.

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