I / F circuit detection device

Abstract

The utility model belongs to the technical field of circuit detection, and particularly discloses an I / F circuit detection device which comprises a measurement and control box and a constant current source. The measurement and control box is connected with the I / F circuit to be tested through a test cable; an AC / DC power supply, an embedded industrial personal computer and a measurement and control board are arranged in the measurement and control box, the measurement and control board comprises a core control chip, a secondary power supply module and a peripheral circuit, and the core control chip is in signal connection with the constant current source; the secondary power supply module supplies power to the core control chip and the I / F circuit to be tested. The peripheral circuit is used for CAN interface isolation, reference frequency scale output control and reversible counting. According to the utility model, the measurement and control board and the embedded industrial personal computer are integrated in the measurement and control box, the core control chip and the peripheral circuit connected with the core control chip are arranged on the measurement and control board, precision indexes such as a power supply, reference frequency, pulse quantity reversible counting and automatic calculation of the I / F circuit required for testing the I / F circuit are provided, and the precision test of the I / F circuit is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to circuit detection technical field, especially related to an I / F circuit detection device. BACKGROUND

[0002] I / F conversion circuit is a kind of circuit that current signal is converted into digital pulse, and main working principle includes current integration and charge balance.It is mainly applied to the conversion of the current signal of accelerometer into pulse signal.Therefore the characteristics of I / F conversion circuit have very important significance for improving navigation accuracy.

[0003] I / F board test needs to provide power supply, reference current source interface, reference frequency, pulse quantity output detection channel, can automatically calculate I / F circuit zero, scale factor, scale factor nonlinearity and other precision indexes.If manual test, standard instrument operation is tedious, and needs to measure large amount of data, and test parameter calculation is complex, seriously affect production efficiency. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the defects in prior art, and provides an I / F circuit detection device.

[0005] The utility model provides an I / F circuit detection device, including measurement and control box and the human-computer interaction equipment and constant current source of connection with measurement and control box;

[0006] The measurement and control box are connected with the I / F circuit to be measured through test cable;

[0007] AC / DC power supply, embedded industrial computer and measurement and control board are arranged in the measurement and control box, the AC / DC power supply is electrically connected with the embedded industrial computer and measurement and control board respectively, and the embedded industrial computer is connected with the measurement and control board through CAN interface;

[0008] The AC / DC power supply is used to convert AC220V voltage into DC27V voltage, and power supply for embedded industrial computer and measurement and control board respectively;

[0009] The measurement and control board includes core control chip and secondary power module and peripheral circuit connected with the core control chip, and the core control chip is connected with the constant current source signal;

[0010] The secondary power module is used to convert DC27V voltage into 5V voltage and ±15V voltage, and the ±5V voltage is used to power supply for core control chip, and the ±15V voltage is used to power supply for I / F circuit to be measured;

[0011] The peripheral circuit is used for CAN interface isolation, reference frequency output control and reversible counting.

[0012] Further, the peripheral circuit comprises a temperature compensation crystal oscillator, a reversible counter and a CAN transceiver connected with the core control chip respectively.

[0013] The temperature compensation crystal oscillator is used for outputting a reference frequency, the reversible counter is used for reversible counting of a pulse quantity signal, and the CAN transceiver is used for sending the reversible counting result to the embedded industrial computer.

[0014] Further, the secondary power module comprises an EC6A11 power conversion module and an SWH15 power conversion module.

[0015] The EC6A11 power conversion module is used for converting a DC 27V voltage into a 5V voltage.

[0016] The SWH15 power conversion module is used for converting a DC 27V voltage into a ±15V voltage.

[0017] Further, the core control chip is a 32-bit floating-point DSP, and the model is TMS320F28335 DSP.

[0018] Further, the box structure of the measurement and control box is a 4U machine box, and a power switch, a voltmeter head, an ammeter head, an indicator lamp, a wave band switch and a test hole are arranged on the front panel of the box structure; a 220VAC three-core power single-phase socket, a product interface, a constant current source input interface and a man-machine interactive display interface are arranged on the rear panel of the box structure.

[0019] The power switch, the ammeter head and the test hole are connected with the AC / DC power supply respectively, the voltmeter head is connected with the AC / DC power supply and the secondary power module through the wave band switch respectively, and the indicator lamp is connected with the core control chip.

[0020] The 220VAC three-core power single-phase socket is connected with the AC / DC power supply, the product interface is connected with a to-be-measured I / F circuit through a test cable, the constant current source input interface is connected with the core control chip, and the man-machine interactive display interface is connected with the embedded industrial computer.

[0021] Compared with the prior art, the utility model has the advantages that:

[0022] The utility model discloses a measurement and control box, which integrates a measurement and control board and an embedded industrial computer, realizes power supply for the measurement and control board and the embedded industrial computer through an AC / DC power supply, and provides a power supply, a reference frequency, reversible counting of a pulse quantity, automatic calculation of an I / F circuit and other precision indexes required by a test I / F circuit through the core control chip and the peripheral circuit connected with the core control chip on the measurement and control board, so that precision test of the I / F circuit is realized.

[0023] The utility model discloses a CAN interface connects industrial computer and control board, and control board automatically controls I / F circuit power on, exports reference frequency mark, completes pulse quantity signal reversible counting, and embedded industrial computer receives the counting result of control board output, and completes I / F circuit each channel precision detection.

[0024] The utility model discloses a secondary power module that is composed of two different model power conversion modules is arranged on the control board, can convert DC 27V voltage into 5V voltage and ± 15V voltage, wherein, ± 5V voltage is used to power the core control chip, ± 15V voltage is used to power the I / F circuit to be measured, realizes the separate power-on demand of core control chip and I / F circuit. BRIEF DESCRIPTION OF DRAWINGS

[0025] The following drawings only make the utility model illustrative and explanatory, and do not use to limit the range of the utility model, wherein:

[0026] Figure 1 The utility model discloses a composition block diagram;

[0027] Figure 2 The utility model discloses a control box principle block diagram;

[0028] Figure 3 The utility model discloses a control box structure front panel structure schematic view;

[0029] Figure 4 The utility model discloses a control box structure rear panel structure schematic view;

[0030] Figure 5 The utility model discloses a control box layout;

[0031] In the drawing: 1, control box;2, AC / DC power supply;3, constant current source;4, embedded industrial computer;5, core control chip;6, secondary power module;7, reversible counter;8, control board;9, temperature compensation crystal oscillator;10, CAN transceiver;11, man-machine interactive device;12, voltmeter head;13, ammeter head;14, indicator lamp;15, test hole;16, power switch;17, man-machine interactive display interface;18, 220VAC three-core power single-phase socket;19, product interface;20, constant current source input interface. DETAILED DESCRIPTION

[0032] In order to make the utility model's purpose, technical scheme, design method and advantage more clear and obvious, the following is further detailed to the utility model through specific embodiment with the drawings. It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0033] As Figure 1 And Figure 2 The utility model provides a kind of I / F circuit detection device, including measurement and control box 1 and the human-computer interaction equipment 11 and constant current source 3 connected with the measurement and control box 1;Wherein, measurement and control box 1 is connected by test cable with the I / F circuit to be measured;AC / DC power supply 2, embedded industrial computer 4 and measurement and control board 8 are provided inside the measurement and control box 1, the AC / DC power supply 2 is electrically connected with the embedded industrial computer 4 and measurement and control board 8 respectively, the embedded industrial computer 4 is connected with the measurement and control board 8 by CAN interface;The AC / DC power supply 2 is used to convert AC220V voltage to DC27V voltage, and embedded industrial computer and measurement and control board 8 are powered respectively;The measurement and control board 8 includes core control chip 5 and secondary power module 6 and peripheral circuit connected with the core control chip 5, and core control chip 5 is 32 bit floating point DSP, and model is TMS320F28335DSP, and the core control chip 5 is signal connected with the constant current source 3;The secondary power module 6 is used to convert DC27V voltage into 5V voltage and ±15V voltage, and the ±5V voltage is used to power core control chip 5, and the ±15V voltage is used to power the I / F circuit to be measured;The peripheral circuit is used for CAN interface isolation, reference frequency mark output control and reversible counting.

[0034] In the above, the peripheral circuit includes temperature compensation crystal oscillator 9, reversible counter 7, CAN transceiver 10 connected with the core control chip 5 respectively;The temperature compensation crystal oscillator 9 is used to output reference frequency mark, the reversible counter 7 is used for reversible counting of pulse quantity signal, and the CAN transceiver 10 is used to send reversible counting result to the embedded industrial computer 4, and in the embodiment, the model of temperature compensation crystal oscillator 9 is J-ZC550-5120K-V3-B5-E, the model of CAN transceiver 10 is SM1040, and the model of reversible counter 7 is B816 of aerospace electronics 772.

[0035] In order to meet the individual power-on demand of core control chip 5 and I / F circuit, the secondary power module 6 of the embodiment includes EC6A11 power conversion module and SWH15 power conversion module;Wherein, EC6A11 power conversion module is used to convert DC27V voltage into 5V voltage, and power core control chip 5, and SWH15 power conversion module is used to convert DC27V voltage into ±15V voltage, and power I / F circuit.

[0036] As Figures 3-5As shown, the box structure of the measurement and control box 1 is a 4U case, and a power switch 16, a voltmeter 12, an ammeter 13, an indicator lamp 14 and a test hole 15 are arranged on the front panel of the box structure; a 220VAC three-core power single-phase socket 18, a product interface 19, a constant current source input interface 20 and a man-machine interactive display interface 17 are arranged on the rear panel of the box structure; the power switch 16, the ammeter 13 and the test hole 15 are connected with the AC / DC power supply 2 respectively, the voltmeter 12 is connected with the AC / DC power supply 2 and the secondary power module 6 through a wave band switch respectively, and the indicator lamp 14 is connected with the core control chip 5; the 220VAC three-core power single-phase socket 18 is connected with the AC / DC power supply 2, the product interface 19 is connected with the I / F circuit to be tested through a test cable, the constant current source input interface 20 is connected with the core control chip 5, and the man-machine interactive display interface 17 is connected with the embedded industrial computer 4, and is used for connecting a man-machine interactive device 11, which is a display, a keyboard, a mouse and the like in the embodiment.

[0037] When the I / F circuit is detected, the AC / DC power supply 2 is used to convert the mains into a DC 27V voltage for supplying power to the embedded industrial computer 4 and the measurement and control board 8, the DC 27V voltage entering the measurement and control board 8 is converted into 5V and ±15V voltages by the secondary power module 6 for supplying power to the core control chip 5 and the I / F circuit respectively, the test device controls the power-on and power-off of the I / F circuit through a 1-way GPIO of the measurement and control board 8, the core control chip 5 controls the constant current source 3 to output a plurality of stable currents according to the test requirements, such as ±1mA, ±5mA, ±10mA and the like, the I / F circuit outputs different pulse quantities, the reversible counter 7 is used to complete the reversible counting of the pulse signals and transmit the pulse signals to the embedded industrial computer 4 through a CAN interface for calculation, and the precision calculation of each channel of the I / F circuit is completed.

[0038] The above has described the embodiments of the present application, and the above description is exemplary, is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. An I / F circuit detection device characterized by comprising: The application relates to a test and control box and a human-machine interaction device and a constant current source connected with the test and control box. The test and control box is connected with an I / F circuit to be tested through a test cable. An AC / DC power supply, an embedded industrial computer and a test and control board are arranged in the test and control box; the AC / DC power supply is electrically connected with the embedded industrial computer and the test and control board respectively; and the embedded industrial computer is connected with the test and control board through a CAN interface. The AC / DC power supply is used for converting AC 220V voltage into DC 27V voltage to supply power to the embedded industrial computer and the test and control board respectively. The test and control board comprises a core control chip and a secondary power module and a peripheral circuit connected with the core control chip; the core control chip is connected with the constant current source signal. The secondary power module is used for converting the DC 27V voltage into 5V voltage and +15V voltage; the 5V voltage is used for supplying power to the core control chip; and the +15V voltage is used for supplying power to the I / F circuit to be tested. The peripheral circuit is used for CAN interface isolation, reference frequency output control and reversible counting.

2. The I / F circuit detection device according to claim 1, characterized by The peripheral circuit comprises a temperature compensation crystal oscillator, a reversible counter and a CAN transceiver connected with the core control chip respectively. The temperature compensation crystal oscillator is used for outputting a reference frequency; the reversible counter is used for reversible counting of a pulse quantity signal; and the CAN transceiver is used for sending a reversible counting result to the embedded industrial computer.

3. The I / F circuit detection device according to claim 2, wherein The secondary power module comprises an EC6A11 power conversion module and an SWH15 power conversion module. The EC6A11 power conversion module is used for converting the DC 27V voltage into 5V voltage. The SWH15 power conversion module is used for converting the DC 27V voltage into +15V voltage.

4. The I / F circuit detection device according to claim 3, wherein The core control chip is a 32-bit floating point DSP, and the model is TMS320F28335 DSP.

5. The I / F circuit detection device according to claim 4, wherein The box body structure of the test and control box is a 4U machine box; a power switch, a voltmeter head, an ammeter head, an indicator lamp and a test hole are arranged on a front panel of the box body structure; a 220VAC three-core power single-phase socket, a product interface, a constant current source input interface and a human-machine interaction display interface are arranged on a rear panel of the box body structure. The power switch, the ammeter head and the test hole are connected with the AC / DC power supply respectively; the voltmeter head is connected with the AC / DC power supply and the secondary power module through a wave band switch respectively; and the indicator lamp is connected with the core control chip. The 220VAC three-core power single-phase socket is connected with the AC / DC power supply; the product interface is connected with the I / F circuit to be tested through a test cable; the constant current source input interface is connected with the core control chip; and the human-machine interaction display interface is connected with the embedded industrial computer.

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