Eight-path MEMS IMU test equipment

Abstract

The utility model discloses an eight-path MEMS IMU test device, which comprises a test board packaged in a casing, and a plurality of interfaces are arranged on the casing. The test board comprises a USB2.0 to eight-path standard serial port circuit, a power supply shunt circuit, an eight-path RS422 drive circuit and an LDO (Low Dropout Regulator) power supply conversion circuit. According to the utility model, eight data acquisition channels and equipment power supply channels can be provided at the same time, and the installation process is simplified; and meanwhile, an original serial port acquisition program can be used without additionally writing upper computer software, so that the use is more convenient, the test time of the IMU is shortened, external configuration equipment is simplified, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of inertial measurement and relates to eight-channel MEMS IMU testing equipment. Background Art

[0002] With the continuous development and maturity of micro-electromechanical system (MEMS) technology, micro-mechanical inertial measurement units (MEMSIMUs) are widely used in military and civilian fields such as robots, drones, and small intelligent ammunition due to their low cost, small size, low power consumption, and wide dynamic range.

[0003] Before the inertial measurement unit (IMU) is put into use, it must undergo rigorous calibration, testing, and various environmental tests to meet technical requirements. Since the above tests and experimental projects take a long time and have high capital and labor costs, multiple products are generally tested at the same time. This requires solving two problems: 1) simultaneous acquisition of multiple serial port signals; 2) simultaneous power supply of multiple devices.

[0004] For simultaneous acquisition of serial port signals, a multi-channel serial port server is generally used. The serial port server packages the serial port data of multiple products into network data of IP / TCP protocol and transmits them to the host computer together. However, it is necessary to specially compile corresponding data receiving software to complete the acquisition and storage of multi-channel data. To power multiple products, a multi-channel output voltage-stabilized power supply is required. However, common power supplies generally have only 4 outputs at most. To provide power supply for more channels, the number of power supply devices needs to be increased. Therefore, this solution is not only costly, but also occupies a large space, and the cable connections are messy, resulting in cumbersome operation and prone to errors. Summary of the invention

[0005] The technical problem solved by the utility model is to provide an eight-channel inertial measurement unit test device, which can simultaneously provide eight-channel data acquisition channels and device power supply channels, simplify external configuration equipment, and simplify the installation process.

[0006] The utility model is realized by the following technical solutions:

[0007] An eight-channel MEMS IMU test device, characterized in that it includes a test board encapsulated in a casing, and the casing is provided with a plurality of interfaces;

[0008] The test board includes a USB2.0 to eight-way standard serial port circuit, a power shunt circuit, an eight-way RS422 drive circuit and an LDO power conversion circuit;

[0009] Among them, each serial port of the USB2.0 to eight-way standard serial port circuit has an independent sending and receiving buffer built in, and each serial port is connected to an RS422 drive circuit respectively, and the RS422 drive circuit is also connected to the test interface;

[0010] A power shunt circuit is connected to the LDO power conversion circuit and the test interface respectively;

[0011] LDO power conversion circuit converts the input power into DC power to power the USB2.0 to eight-way standard serial port circuit and RS422 drive circuit;

[0012] The external interface includes:

[0013] The command interface is connected to the USB2.0 to eight-way standard serial port circuit;

[0014] A power interface connected to an input end of a power shunt circuit;

[0015] The test interface can be connected to the MEMS IMU under test through a test cable. Each test cable includes a power supply line and an RS422 serial communication line.

[0016] Furthermore, it also includes a power indicator light and a USB status indicator light, which are respectively connected to the LDO power conversion circuit and the USB2.0 to eight-way standard serial port circuit.

[0017] Compared with the prior art, the utility model has the following beneficial technical effects:

[0018] The utility model can provide eight data acquisition channels and equipment power supply channels at the same time, simplifying the installation process; at the same time, the original serial port acquisition program can be used without the need to write additional host computer software, which is more convenient to use, shortens the inertial measurement unit (IMU) test time, simplifies external configuration equipment, and reduces manufacturing costs.

[0019] The utility model provides an eight-channel data acquisition and power supply circuit. If the number of devices to be tested simultaneously needs to be increased, corresponding communication circuits, power supply circuits and interfaces can be added as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a connection diagram of the test equipment of the utility model;

[0021] Figure 2 This is a connection diagram for use with the test equipment of the present utility model. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0023] See also Figure 1 , an eight-channel MEMS IMU test device, characterized in that it includes a test board encapsulated in a casing, and the casing is provided with a plurality of interfaces;

[0024] The test board includes a USB2.0 to eight-way standard serial port circuit, a power shunt circuit, an eight-way RS422 drive circuit and an LDO power conversion circuit;

[0025] Among them, each serial port of the USB2.0 to eight-way standard serial port circuit has an independent sending and receiving buffer built in, and each serial port is connected to an RS422 drive circuit respectively, and the RS422 drive circuit is also connected to the test interface;

[0026] A power shunt circuit is connected to the LDO power conversion circuit and the test interface respectively;

[0027] LDO power conversion circuit converts the input power into DC power to power the USB2.0 to eight-way standard serial port circuit and RS422 drive circuit;

[0028] The external interface includes:

[0029] The command interface is connected to the USB2.0 to eight-way standard serial port circuit;

[0030] A power interface connected to an input end of a power shunt circuit;

[0031] The test interface can be connected to the MEMS IMU under test through a test cable. Each test cable includes a power supply line and an RS422 serial communication line.

[0032] Furthermore, it also includes a power indicator light and a USB status indicator light, which are respectively connected to the LDO power conversion circuit and the USB2.0 to eight-way standard serial port circuit.

[0033] Specific examples are given below.

[0034] The utility model provides an eight-channel inertial measurement unit (IMU) test device, comprising a casing, an external interface, an indicator light and a test board.

[0035] The casing is made of aluminum alloy and has good electromagnetic compatibility.

[0036] External interfaces include:

[0037] The power interface (interface 1) is connected to the input end of the power shunt circuit to power the test equipment. Specifically, a set of red and black 4mm banana plug female sockets can be used;

[0038] The command interface (interface 2) connects the USB2.0 to eight-way standard serial port circuit to the computer that sends the test command, and specifically can use a USB2.0 female connector;

[0039] The test interface (interface 3) is connected to the inertial measurement unit to send test instructions to it and provide power for it. Specifically, a DB50 female interface and a 1-to-8-way test cable can be used.

[0040] There are two indicator lights: power indicator light and USB status indicator light.

[0041] The test board includes a USB2.0 to eight-way standard serial port circuit, a power shunt circuit, eight-way RS422 drive circuit and an LDO power conversion circuit.

[0042] USB2.0 to eight standard serial ports, each serial port has an independent built-in transmit and receive buffer. Each serial port has a built-in 2KB receive buffer and 1KB send buffer. The communication baud rate supports 1200bps~6Mbps, and USB has ESD protection.

[0043] The power shunt circuit supplies the input power to the test interface and provides power input for the on-board circuit to prevent power crosstalk between the on-board power supply and the IMU under test.

[0044] Eight-way RS422 drive circuit, eight-way serial port full-duplex, each independent, with ESD protection.

[0045] The LDO power conversion circuit converts the power input to 3.3V to power the test board.

[0046] like Figure 2 As shown in the figure, when using this test equipment, only one power supply device and a computer with a USB port are needed, and three cables can complete the test and calibration of 8 IMU devices. Among them:

[0047] A USB data cable is connected to the computer through the command interface, which is used to test that the computer sends commands to the 8 tested devices through the serial port and collects data from the 8 tested IMUs through the serial port.

[0048] 1 power cord is connected to the DC regulated power supply through the power interface to power the test equipment;

[0049] 1 test cable, using 1-to-8-way cable, each cable includes a set of power supply lines and a set of RS422 serial communication lines; connected to 8 devices under test through the test interface, used for 8-way data communication and 8-way device power supply.

[0050] The utility model provides an eight-channel data acquisition and power supply circuit. If the number of devices to be tested simultaneously needs to be increased, corresponding communication circuits, power supply circuits and interfaces can be added as needed.

[0051] The utility model can provide eight data acquisition channels and equipment power supply channels at the same time, simplifying the installation process; shortening the inertial measurement unit (IMU) test time, simplifying external configuration equipment, and reducing manufacturing costs.

[0052] The above embodiments are preferred examples for implementing the present invention, and the present invention is not limited to the above embodiments. Any non-essential additions and substitutions made by those skilled in the art based on the technical features of the present invention are within the protection scope of the present invention.

Claims

1. An eight-channel MEMS IMU test device, characterized in that: It includes a test board enclosed in a housing, and the housing is provided with a plurality of interfaces; The test board includes a USB2.0 to eight-way standard serial port circuit, a power shunt circuit, an eight-way RS422 drive circuit and an LDO power conversion circuit; Among them, each serial port of the USB2.0 to eight-way standard serial port circuit has an independent sending and receiving buffer built in, and each serial port is connected to an RS422 drive circuit respectively, and the RS422 drive circuit is also connected to the test interface; A power shunt circuit is connected to the LDO power conversion circuit and the test interface respectively; LDO power conversion circuit converts the input power into DC power to power the USB2.0 to eight-way standard serial port circuit and RS422 drive circuit; The interface includes: The command interface is connected to the USB2.0 to eight-way standard serial port circuit; A power interface connected to an input end of a power shunt circuit; The test interface can be connected to the MEMS IMU under test through a test cable. Each test cable includes a power supply line and an RS422 serial communication line.

2. The eight-way MEMS IMU test device according to claim 1, characterized in that: It also includes a power indicator light and a USB status indicator light, which are respectively connected to the LDO power conversion circuit and the USB2.0 to eight-way standard serial port circuit.

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