Reaction cam controller testing device

Abstract

The invention discloses a reaction cam controller testing device which is used for testing a circuit board of a cam controller. The reaction cam controller testing device comprises a control device for controlling a testing process and acquiring, processing and displaying testing data; the power supply can supply power to the tested circuit board; the signal conditioning and switching equipment is used for carrying out conversion and unified operation on signals between the control equipment and the tested circuit board, and the signal conversion and unified operation comprises power supply voltage acquisition and conversion, power supply current acquisition and conversion, steering signal acquisition and conversion and the like; the signal conditioning and switching equipment comprises a first serial port connected with a third serial port of the control equipment and a second serial port used for being connected with a tested circuit board, and the signal conditioning and switching equipment is further connected with the control equipment through a data acquisition card; and the test cable is used for signal transmission between the signal conditioning switching equipment and the tested circuit board. According to the invention, testing and screening tasks of the reaction cam controller assembly can be efficiently completed.

Description

Technical Field

[0001] The present application relates to the field of circuit board testing, and in particular to a reaction cam controller testing device. Background Art

[0002] The reaction cam controller is a key component used to control and monitor the reaction cam system, which plays an important role in aerospace, industrial automation and other fields. The reaction cam controller can ensure the stability and reliability of the cam system at high speed rotation, so the test of the reaction cam controller cannot be ignored.

[0003] In the process of developing a reaction cam controller, we first need to clarify the specific requirements of the circuit board, then design and determine the corresponding test items or test cases based on these requirements, and then conduct pure manual testing and debugging. However, in the process of pure manual execution of test items, it is often necessary to build multiple test environments and use a large number of complicated test equipment, such as oscilloscopes and multimeters, which is not only time-consuming, but also places high demands on the technical quality of the operators. Summary of the invention

[0004] The technical problem to be solved by the present application is how to improve the integration of the test device to reduce the difficulty of executing the test items.

[0005] In order to solve the above technical problems, the present application provides a reaction cam controller testing device, which is used for testing a circuit board of a reaction cam controller, comprising: Control equipment, control the test process, and collect, process and display test data; A power supply capable of supplying power to a circuit board under test, the circuit board under test being a circuit board of a reaction cam controller; A signal conditioning and switching device converts and uniformly operates the signals between the control device and the circuit board under test, wherein the signal conversion and uniform operation include: power supply voltage acquisition and conversion, power supply current acquisition and conversion, speed pulse frequency multiplication signal acquisition and conversion, steering signal acquisition and conversion, motor current test signal acquisition and conversion, motor drive power tube control signal acquisition and conversion, instruction switching indication signal acquisition and conversion, power supply on-off control, speed signal source conversion and transmission, motor position signal source conversion and output, motor current analog signal conversion and output, thermistor analog signal conversion and output, and serial communication level conversion. The signal conditioning and switching device includes a first serial port connected to the third serial port of the control device and a second serial port for connecting the circuit board under test. The signal conditioning and switching device is also connected to the control device through a data acquisition card; The test cable is used for signal transmission between the signal conditioning and switching device and the circuit board under test.

[0006] Preferably, the data acquisition card can collect the converted power supply voltage signal, power supply current signal, speed pulse frequency multiplication signal, steering signal, motor current test signal, motor drive power tube control signal, and instruction switching indication signal after conversion by the signal conditioning adapter to generate test data and send the test data to the control device.

[0007] Preferably, the signal conditioning switching device further includes: A first relay connected between the power supply and the circuit board under test; A relay driver chip capable of controlling the opening and closing of the power supply control relay to complete the on-off control operation of the power supply; The direct digital frequency synthesizer module can generate two variable-frequency speed signal sources to complete the operation of speed signal source conversion and transmission, and can also generate nine variable-frequency motor position signal sources to complete the operation of motor position signal source conversion and output; A programmable current source provides a constant current to complete the operation of converting and outputting the motor current analog signal; The thermistor analog signal switching circuit includes a plurality of power resistors and a plurality of second relays. The second relays are controlled by the digital channel of the data acquisition card to realize the selective connection of the power resistors, thereby simulating thermistor signals at different temperatures and completing the operation of converting and outputting the thermistor analog signals.

[0008] Preferably, both ends of the test cable are respectively fixed with aviation plugs, and the signal conditioning adapter device and the circuit board under test are detachably connected through the test cable.

[0009] Preferably, the signal conditioning switching device further includes: A signal conditioning transfer box, the signal conditioning transfer box comprising a front panel and a rear panel, The front panel is provided with a total power supply voltage test point, a total power supply current test point, a secondary power supply voltage test point, a speed pulse frequency multiplication signal test point, a turn signal test point, a motor current simulation signal test point, a speed telemetry signal test point, and a motor drive power tube control signal test point. The rear panel is provided with a data acquisition card interface connected to the control device, a third serial port connected to the control device, an aviation plug interface for connecting the circuit board under test, an aviation socket for connecting the power supply, and a 220V main power socket of the mains.

[0010] Preferably, the first serial port and the third serial port are both RS-232 standard serial ports, the second serial port is an RS-422 standard serial port, and the signal conditioning switching device further includes: A communication chip that can realize mutual conversion between RS-232 level and RS-422 level.

[0011] Preferably, the power supply is a 50V adjustable DC power supply.

[0012] One or more technical solutions provided in this application have at least the following technical effects or advantages: The reaction cam controller test device of the present application integrates multiple test functions such as power supply, signal conversion, data acquisition, etc., and can process and display test data, simplifying the construction of the test environment, ensuring the accuracy and consistency of the test data, and reducing the dependence on the technical quality of the operator. The test data can clearly identify the functional failures and performance defects of the circuit board assembly, i.e. the circuit board. Compared with the traditional pure manual testing and debugging, it not only saves a lot of manpower, but also greatly improves the test efficiency. Therefore, the present application can improve the integration of the test device to reduce the difficulty of executing the test items, thereby efficiently completing the test and screening tasks of the reaction cam controller assembly, and improving the product development efficiency and testing capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 It is a schematic diagram of the composition structure of the reaction cam controller testing device provided in the embodiment of the present application; Figure 2 It is a schematic diagram of the electrical connection relationship of the reaction cam controller test device provided in the embodiment of the present application; Figure 3 It is a schematic diagram of the acquisition process of the power supply voltage signal provided in the embodiment of the present application; Figure 4 It is a schematic diagram of the speed pulse frequency multiplication signal acquisition process provided by the embodiment of the present application; Figure 5 It is a schematic diagram of the turn signal collection process provided by an embodiment of the present application; Figure 6 It is a schematic diagram of the motor current test signal acquisition process provided by the embodiment of the present application; Figure 7 It is a schematic diagram of the motor drive power tube control signal acquisition process provided by the embodiment of the present application; Figure 8 This is a schematic diagram of the power supply on-off control process provided by an embodiment of the present application; Fig. 9 It is a schematic diagram of the basic principle of power supply on-off control provided in the embodiment of the present application; Fig.10 It is a schematic diagram of the motor current analog signal conversion and output process provided by the embodiment of the present application; Fig.11 It is a schematic diagram of the basic control principle of the thermistor analog signal switching circuit provided in the embodiment of the present application. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described in the present application are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0016] Reaction cam controller test device, used for testing the circuit board of the reaction cam controller, including: A control device controls the test process and collects, processes and displays test data. In this embodiment, the control device is specifically a computer. The control device is installed with a host computer software. The host computer software can complete command sending and data reception through the RS-422 asynchronous serial port, that is, it can combine commands into serial data according to test needs and send them to the circuit board under test through the serial port. The circuit board under test is the circuit board of the reaction cam controller. It can also parse the data received by the serial port, obtain its corresponding actual meaning and display it on the software interface. The host computer software can analyze, process, echo, store, query and display the data collected by the computer and the data received through the serial port. That is, after the acquired data is analyzed and processed, it is displayed in real time on the software interface in the form of numerical values ​​and curve graphs. The test results can be saved to the database in time. After the test is completed, the test results can be queried. The query results can be displayed in the form of tables or graphics in the report. The host computer software can be developed based on the MFC software development framework using the C++ high-level programming language; Please refer to Figure 1 , power supply, capable of supplying power to the circuit board under test; Please refer to Figure 2, a signal conditioning and switching device converts and uniformly operates the signals between the control device and the circuit board under test, wherein the signal conversion and uniform operation include: power supply voltage acquisition conversion, power supply current acquisition conversion, speed pulse frequency multiplication signal acquisition conversion, steering signal acquisition conversion, motor current test signal acquisition conversion, motor drive power tube control signal acquisition conversion, instruction switch indication signal acquisition conversion, power supply on-off control, speed signal source conversion and transmission, motor position signal source conversion output, motor current analog signal conversion output, thermistor analog signal conversion output, and serial communication level conversion. The signal conditioning and switching device includes a first serial port connected to the third serial port of the control device and a second serial port for connecting the circuit board under test. The signal conditioning and switching device is also connected to the control device through a data acquisition card; Please refer to Figure 1 , a test cable is used for signal transmission between the signal conditioning and switching device and the circuit board under test.

[0017] Please refer to Figure 2 The data acquisition card can collect the signals converted by the signal conditioning adapter. The converted signals include: power supply voltage signal, power supply current signal, speed pulse frequency multiplication signal, steering signal, motor current test signal, motor drive power tube control signal, and instruction switching indication signal. Test data is generated by collecting the signals converted by the signal conditioning adapter, and the test data is sent to the control device.

[0018] The acquisition process of the power supply voltage signal is as follows: Figure 3 As shown, since the measuring range of the data acquisition card is usually small, the measuring range of the data acquisition card in this embodiment is ±10V, and the voltage of the power supply of the circuit board under test is usually +28V or +42V, the power supply voltage signal needs to be collected by the data acquisition card after voltage division and impedance conversion in the signal conditioning and switching device. Specifically, for the power supply voltage signal, it is necessary to divide the voltage through a resistor to make it meet the measuring range of ±10V, and at the same time, through impedance conversion, the power supply voltage signal is in a high-impedance state to the input port and in a low-impedance state to the acquisition port of the data acquisition card, so as to meet the requirements of high-precision acquisition.

[0019] The power supply current signal is used to detect whether the power supply current is normal and monitor whether the power consumption of the product under test is normal. Most data acquisition cards can only collect voltage signals, so for the collection of power supply current signals, a Hall current sensor is used for conversion in this embodiment. According to the Hall effect principle, the Hall current sensor can convert the current signal passing through into a voltage signal in a non-contact manner, and the values ​​of the two are linearly proportional. Pass the power cord of the power supply through the hole in the middle of the Hall current sensor, and the Hall current sensor can output a voltage value that is proportional to the current in the power cord. After that, the voltage is amplified by the operational amplifier circuit and connected to the analog acquisition channel of the data acquisition card. The control device reads the voltage value, and the actual current size can be obtained through parameter conversion.

[0020] Please refer to Figure 4 , Figure 4 This is a flow chart for the acquisition of speed pulse frequency doubling signals. The speed pulse frequency doubling signal is a RS-422 standard differential square wave signal, and the maximum frequency can reach 700kHz. The speed pulse frequency doubling signal is connected to the acquisition port of the data acquisition card after differential to single-ended conversion, and the DMA continuous sampling method is used for fixed-frequency acquisition at the specified sampling rate.

[0021] Please refer to Figure 5 , Figure 5 This is a flow chart of turn signal acquisition. The turn signal is an RS-422 standard differential signal. After differential to single-ended conversion, it can be connected to the acquisition port of the data acquisition card.

[0022] Please refer to Figure 6 , Figure 6 This is the flow chart of motor current test signal acquisition. The motor current test signal is a 0~5V analog voltage signal, which corresponds linearly to the actual motor current of 0~2.5A. Since the signal range is within the ±10V range of the data acquisition card, it can be directly connected to the data acquisition card and the voltage value can be read using the host computer software, and finally the voltage value can be converted into the actual current value.

[0023] Please refer to Figure 7 , Figure 7 This is a flow chart for collecting motor drive power tube control signals. In this embodiment, a total of 6 motor drive power tube control signals need to be measured, of which 3 are 12V square waves, and the other 3 are high-level 42V and low-level 27.8V pulse signals, and the frequency of all signals is not greater than 1kHz. Since the motor drive power tube control signal exceeds the ±10V range of the data acquisition card and is a periodic pulse signal, the 6 motor drive power tube control signals need to be converted in the signal conditioning and switching device and then collected by the data acquisition card in DMA continuous sampling mode.

[0024] The command switching indication signal is a 0V or 5V level signal, which can be directly connected to the analog acquisition port of the data acquisition card. The command switching indication signal acquisition process can refer to the motor current test signal acquisition process.

[0025] Specifically, the signal conditioning switching device also includes: A first relay connected between the power supply and the circuit board under test; A relay driver chip capable of controlling the opening and closing of the power supply control relay to complete the on-off control operation of the power supply; Please refer to Figure 8 and Fig. 9 , Figure 8 It is the power supply on-off control process diagram. Fig. 9 It is the basic principle diagram of the on-off control of the power supply. The operation of the on-off control of the power supply is specifically to use the digital channel of the data acquisition card to control the control end of the relay driver chip, and then control the first relay to realize the switching of the switch open and closed states, thereby realizing the on-off control of the power supply.

[0026] The direct digital frequency synthesizer module can generate two variable-frequency speed signal sources to complete the operation of speed signal source conversion and transmission, and can also generate nine variable-frequency motor position signal sources to complete the operation of motor position signal source conversion and output; Among them, the operation of converting and sending the speed signal source includes providing two variable-frequency speed signal sources, the speed signal sources are A and B with a common ground, the speed signal source is a TTL level output, and the frequency of the speed signal source is continuously adjustable from 0 to 200kHz, the phase difference between the two speed signal sources can be set to +90° or -90°, the speed signal source has a load capacity of not less than 500Ω, and can be controlled by the upper computer software to output, the two variable-frequency speed signal sources are generated under the control of the direct digital frequency synthesizer module, and the direct digital frequency synthesizer module has the advantages of low cost, low power consumption, high resolution and fast conversion time compared with the traditional frequency synthesizer, and is widely used in the fields of telecommunications and electronic instruments. The output of the synthesizer module is generally a digitized sine wave, so it needs to pass through a high-speed D / A converter and a low-pass filter to obtain a usable analog frequency signal; the operation of converting and outputting the motor position signal source includes providing nine variable-frequency motor position signal sources, the variable-frequency motor position signal sources are H1 to H9, a total of 9 channels with a common ground, OC gate output, and the frequency is continuously adjustable from 0 to 1000 Hz. The 9 variable-frequency motor position signal sources are divided into 3 groups. The phase difference between the variable-frequency motor position signal sources in the same group can be set to +120° or -120°, and the phase difference between the three groups of variable-frequency motor position signal sources can be set to +20° or -20°. The variable-frequency motor position signal source has a load capacity of not less than 500Ω, and the output is controlled by the host computer software.

[0027] A programmable current source provides a constant current to complete the operation of converting and outputting the motor current analog signal; Please refer to Fig.10 , Fig.10 It is a process diagram of the conversion and output of the motor current analog signal. The operation of the conversion and output of the motor current analog signal includes providing the motor current analog output. There is a total of 1 current output, and the size is adjustable from 0 to 3A. The output is controlled and the current size is adjusted by the host computer software. When the circuit is implemented, the programmable current source is used to provide a constant current. After the corresponding current value is set in the host computer software, the programmable current source transmits the current of the specified size to the corresponding port of the circuit board under test.

[0028] Thermistor analog signal switching circuit includes a plurality of power resistors and a plurality of second relays. The second relays are controlled by the digital channel of the data acquisition card to realize the selective connection of the power resistors, thereby simulating thermistor signals at different temperatures and completing the operation of thermistor analog signal conversion output. Please refer to Fig.11 , Fig.11This is a basic control schematic diagram of a thermistor analog signal switching circuit. The actual resistance value in the circuit can be changed by controlling the second relay. In this embodiment, five resistance values ​​can be selected to simulate thermistor signals at different temperatures.

[0029] Specifically, aviation plugs are fixedly arranged at both ends of the test cable, and the signal conditioning adapter device is detachably connected to the circuit board under test through the test cable.

[0030] Specifically, the signal conditioning switching device also includes: A signal conditioning switching box comprises a front panel and a rear panel.

[0031] The front panel is provided with test points, which include a total power supply voltage test point, a total power supply current test point, a secondary power supply voltage test point, a speed pulse frequency multiplication signal test point, a turn signal test point, a motor current simulation signal test point, a speed telemetry signal test point, and a motor drive power tube control signal test point. The test points on the front panel are usually used to connect external test instruments so that the operator can manually connect the test points for testing and measurement operations.

[0032] The rear panel is provided with a data acquisition card interface connected to the control device, a third serial port connected to the control device, a plug interface for connecting to a circuit board under test, a socket for connecting to the power supply, and a 220V main power socket of the mains.

[0033] In this embodiment, the power supply is arranged at the lower side of the signal conditioning adapter box, and the power supply can also supply power to the signal conditioning adapter device.

[0034] Since the control device usually only provides RS-232 standard serial interface, the signal conditioning adapter is required to convert the RS-232 standard serial interface to RS-422 standard serial interface and then connect it to the circuit board under test. Figure 2 The first serial port and the third serial port are both RS-232 standard serial interfaces, that is, the control device and the signal conditioning and switching device perform RS-232 standard serial communication, and the second serial port is an RS-422 standard serial interface, that is, the signal conditioning and switching device can perform RS-422 standard serial communication with the circuit board under test, and the signal conditioning and switching device also includes a communication chip that can realize mutual conversion between RS-232 level and RS-422 level.

[0035] Specifically, most of the circuit boards under test are powered by 28V or 42V, so the power supply selects a 50V adjustable DC power supply. The other voltages such as ±12V, +5V and +2.5V required inside the circuit board under test are converted and generated by the circuit board under test itself, without the need for external separate power supply.

[0036] It should also be noted that in this specification, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. Reaction cam controller test device, characterized in that, Testing of circuit boards for reaction cam controllers including: Control equipment, control the test process, and collect, process and display test data; A power supply capable of supplying power to the circuit board under test; A signal conditioning and switching device converts and uniformly operates the signals between the control device and the circuit board under test, wherein the signal conversion and uniform operation include: power supply voltage acquisition and conversion, power supply current acquisition and conversion, speed pulse frequency multiplication signal acquisition and conversion, steering signal acquisition and conversion, motor current test signal acquisition and conversion, motor drive power tube control signal acquisition and conversion, instruction switch indication signal acquisition and conversion, power supply on-off control, speed signal source conversion and transmission, motor position signal source conversion and output, motor current analog signal conversion and output, thermistor analog signal conversion and output, and serial communication level conversion, wherein the signal conditioning and switching device includes a first serial port connected to the third serial port of the control device and a second serial port for connecting the circuit board under test, and the signal conditioning and switching device is also connected to the control device through a data acquisition card; The test cable is used for signal transmission between the signal conditioning and switching device and the circuit board under test.

2. The reaction cam controller testing device according to claim 1, characterized in that: The data acquisition card can collect the converted power supply voltage signal, power supply current signal, speed pulse frequency multiplication signal, steering signal, motor current test signal, motor drive power tube control signal, and instruction switching indication signal after conversion by the signal conditioning adapter to generate test data and send the test data to the control device.

3. The reaction cam controller testing device according to claim 1, characterized in that: The signal conditioning switching device also includes: A first relay connected between the power supply and the circuit board under test; A relay driver chip capable of controlling the opening and closing of the power supply control relay to complete the on-off control operation of the power supply; The direct digital frequency synthesizer module can generate two variable-frequency speed signal sources to complete the operation of speed signal source conversion and transmission, and can also generate nine variable-frequency motor position signal sources to complete the operation of motor position signal source conversion and output; A programmable current source provides a constant current to complete the operation of converting and outputting the motor current analog signal; The thermistor analog signal switching circuit includes a plurality of power resistors and a plurality of second relays. The second relays are controlled by the digital channel of the data acquisition card to realize the selective connection of the power resistors, thereby simulating thermistor signals at different temperatures and completing the operation of converting and outputting the thermistor analog signals.

4. The reaction cam controller testing device according to claim 1, characterized in that: Both ends of the test cable are respectively fixed with aviation plugs, and the signal conditioning adapter device and the circuit board under test are detachably connected through the test cable.

5. The reaction cam controller testing device according to claim 1, characterized in that: The signal conditioning switching device also includes: A signal conditioning transfer box, the signal conditioning transfer box comprising a front panel and a rear panel, The front panel is provided with a total power supply voltage test point, a total power supply current test point, a secondary power supply voltage test point, a speed pulse frequency multiplication signal test point, a turn signal test point, a motor current simulation signal test point, a speed telemetry signal test point, and a motor drive power tube control signal test point. The rear panel is provided with a data acquisition card interface connected to the control device, a third serial port connected to the control device, an aviation plug interface for connecting the circuit board under test, an aviation socket for connecting the power supply, and a 220V main power socket of the mains.

6. The reaction cam controller testing device according to claim 1, characterized in that: The first serial port and the third serial port are both RS-232 standard serial ports, the second serial port is an RS-422 standard serial port, and the signal conditioning switching device further includes: A communication chip that can realize mutual conversion between RS-232 level and RS-422 level.

7. The reaction cam controller testing device according to claim 1, characterized in that: The power supply is a 50V adjustable DC power supply.

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