CN110542890B - Radar central distribution box offline automatic detection system and method - Google Patents

Radar central distribution box offline automatic detection system and method Download PDF

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Publication number
CN110542890B
CN110542890B CN201910945991.3A CN201910945991A CN110542890B CN 110542890 B CN110542890 B CN 110542890B CN 201910945991 A CN201910945991 A CN 201910945991A CN 110542890 B CN110542890 B CN 110542890B
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alternating current
chip microcomputer
single chip
relay group
current relay
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CN110542890A (en
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郑东峰
畅玲
屈博
许保卫
聂强
畅言
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Xian Electronic Engineering Research Institute
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Xian Electronic Engineering Research Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4004—Means for monitoring or calibrating of parts of a radar system

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention relates to an off-line automatic detection system and method for a radar central distribution box, wherein the system comprises a multi-channel switching unit, a single chip microcomputer control and numerical control acquisition unit and a power distribution control signal driving output module, the single chip microcomputer control and numerical control acquisition unit controls the power distribution control signal driving output module to supply power to each path of power distribution working state required by the radar central distribution box, and the multi-channel switching unit is controlled to be opened or closed to acquire a detected signal. The invention greatly improves the safety, convenience, compatibility and traceability of system test and simultaneously greatly improves the test efficiency.

Description

Radar central distribution box offline automatic detection system and method
Technical Field
The invention belongs to the field of radar testing, and particularly relates to an off-line automatic detection system and method for a radar central distribution box. Belongs to a method for product design and detection.
Background
The radar central distribution box is one of key subsystems of the radar and is responsible for providing electric energy for all subsystems of the radar. It is responsible for distributing three-phase alternating current (AC 380V) sent by a power station to each unit according to the requirement of each power utilization unit and providing control and protection.
Radar central distribution boxes need to provide ac and dc power to tens or even twenty-several subsystems. The dc power supply may involve various varieties (e.g., +24V, +36V, +48V, etc.), while the AC power supply provides accurate phases, lines (U, V, W, N, PE) and sizes (AC 220V, AC 380V), cannot be out of phase, out of line, out of value, or cause damage or injury to the power system. Therefore, the central distribution box must be comprehensively tested before the complete machine is assembled so as to ensure that the normal and accurate power supply is provided for each power utilization system after the central distribution box is on station.
At present, no related automatic detection method exists, and usually, the point testing is performed on the output socket manually, so that potential safety hazards exist, time and labor are wasted when the testing points reach hundreds of points, and the integrity of the testing cannot be guaranteed.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides an off-line automatic detection system and method for a radar central distribution box.
Technical scheme
An off-line automatic detection system for a radar central distribution box is characterized by comprising a multi-channel switching unit, a single chip microcomputer control and numerical control acquisition unit and a distribution control signal drive output module, wherein the multi-channel switching unit comprises a first alternating current relay group, a second alternating current relay group, a third alternating current relay group and a direct current relay group, the single chip microcomputer control and numerical control acquisition unit comprises an isolation transformation module, an A/D module, a RS232 interface and a single chip microcomputer, the isolation transformation module is connected with the A/D module, the A/D module is respectively connected with the RS232 interface and the single chip microcomputer, and the RS232 interface is respectively connected with the single chip microcomputer and a computer; one end of the first alternating current relay is connected with a No. 1-10 alternating current output port of the radar central distribution box, and the other end of the first alternating current relay is connected with the isolation transformation module; one end of the second alternating current relay group is connected with an alternating current output port of No. 11-20 of the radar central distribution box, and the other end of the second alternating current relay group is connected with the isolation transformation module; one end of the third alternating current relay group is connected with a No. 21-30 alternating current port of the radar central distribution box, and the output of the other end of the third alternating current relay group is connected with the isolation transformation module; one end of the direct current relay group is connected with a No. 1-10 direct current output port of the radar central distribution box, and the other end of the direct current relay group is connected with the A/D module; the single chip microcomputer is respectively connected with the first alternating current relay, the second alternating current relay group, the third alternating current relay group and the direct current relay group to provide channel control signals for the first alternating current relay group, the second alternating current relay group, the third alternating current relay group and the direct current relay group, and is connected with the power distribution control signal driving output module to provide power distribution control signals for the single chip microcomputer; the RS232 interface is connected with the computer, receives the test command of the computer and sends the test result to the computer.
An off-line automatic detection method for a radar central distribution box is characterized by comprising the following steps:
step 1: the single chip microcomputer control and numerical control acquisition unit receives a test command sent by a computer, outputs a power distribution control signal to the power distribution control signal drive output module after being processed by an internal single chip microcomputer, and the power distribution control signal drive output module drives the voltage and current of the power distribution control signal sent by the single chip microcomputer and then provides the power distribution control signal to each power distribution working state required by the radar central power distribution box;
and 2, step: the single chip microcomputer outputs a channel selection signal to a corresponding relay group, the corresponding relay group is opened, and an alternating current/direct current signal to be tested is input to the single chip microcomputer control and numerical control acquisition unit;
and 3, step 3: the single chip microcomputer control and numerical control acquisition unit samples an alternating current/direct current signal to be tested;
and 4, step 4: the sampled signal is transmitted to the computer through RS 232.
The sampling of the single chip microcomputer control and numerical control acquisition unit on the alternating current signal to be detected is as follows: the measured signals Vin +, vin-are divided by precision resistors R9, R10 and R11 to obtain signals with the output range of 0-250 mV, the signals are isolated and amplified by an isolation amplifier AMC1100, differential signals with the peak value range of +/-2V are output, the differential signals enter a differential-to-single-ended circuit formed by a low-noise operational amplifier OP184 and are converted into single-ended signals with the voltage of 0-2V, the signals are subjected to RMS-DC conversion through an RMS-DC chip AD8436 and are converted into effective direct-current voltage, the effective direct-current voltage is sent to an ADC for sampling, and the ADC adopts a self-contained 12-bit ADC in a singlechip C8051F 040.
Advantageous effects
The invention provides an off-line automatic detection method for a radar central distribution box. On the basis of completing the automatic test of the system, the method can be used for comprehensively testing the radar central distribution box before the complete machine is assembled, so that the safety, convenience, compatibility and traceability of the system test are greatly improved, and meanwhile, the test efficiency is greatly improved. The following problems are solved:
1) Safety of the test: measures are taken from two aspects of hardware and software, and personal safety and system safety during power-on test are guaranteed.
2) Convenience of testing: and a friendly man-machine interface is designed, and all the test point data and states can be observed in real time only by running a test program.
3) Compatibility of the test: under the condition that the hardware resource configuration is not changed, the test requirements of a plurality of projects can be met only by replacing the adaptive cable and slightly adjusting the software according to the difference of the power utilization system.
4) Traceability of the test: and after each test is finished, generating a report according to the test time for subsequent visits.
Drawings
FIG. 1 is a block diagram of a testing apparatus for a multi-channel power supply and distribution system
FIG. 2 is a schematic block diagram of a circuit of a relay set
FIG. 3 is a schematic diagram of a single chip microcomputer control and data acquisition unit
FIG. 4 is a circuit diagram of a single-channel control signal driving output circuit
FIG. 5 shows a test apparatus and a device under test connected by an adapter cable
FIG. 6 test flow chart
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the block diagram of the testing equipment of the invention is shown in figure 1, and the figure is designed according to 3 alternating current relay groups and 1 direct current relay group. According to different tested systems, the number of the relay groups can be increased or decreased according to requirements.
The test equipment comprises a singlechip control and data acquisition unit, a multi-channel switching unit, a power distribution control signal drive output, an adaptive cable and a computer. The test equipment is mainly used for testing the voltage values of the multiple paths of alternating current and direct current signals.
The computer is connected to the test equipment through the RS232 interface, sends the test command and receives the test result through the RS232 interface, and displays the test result on a computer screen.
The single chip microcomputer control and data acquisition unit comprises a single chip microcomputer, an isolation transformation part, an A/D part and an RS232 part. The unit receives a test command sent by the computer, outputs a channel selection signal and a power distribution control signal after being processed by an internal single chip microcomputer, controls internal A/D and RS232 interfaces, collects a test result and reports the test result to the computer.
The multi-channel switching unit selects a corresponding relay group to be switched on and off according to a received channel selection signal sent by the single chip microcomputer control and data acquisition unit, and sends the selected alternating current/direct current signal to be tested to the single chip microcomputer control and data acquisition unit to be tested.
The power distribution control signal drives and outputs power distribution control signals sent by the singlechip to supply power distribution working states required by the radar central power distribution box after voltage and current driving.
The adapter cable is used for connecting the test equipment and the radar central distribution box. Through changing different adaptation cables, can accomplish the test of the radar central distribution box of multiple model.
And connecting the test equipment and the radar central distribution box to be tested. And powering on, sending a test command by the computer through the interface, controlling the output of the central distribution box and testing the voltage value of the central distribution box through various control signals after the test equipment receives the test command sent by the computer, then reporting the voltage value to the computer through the RS232 serial port, and receiving test data and displaying the test result on the interface by the computer.
The multi-channel test switching mode is realized as follows:
the multichannel test switching mode is realized by adopting a relay set: as shown in fig. 2, the relay set includes an ac relay set and a dc relay set.
In order to design modularization, all relay groups are composed of the same circuit on hardware, each relay group comprises ten relays and is connected with ten paths of signals to be tested, and switching selection of the test signals is completed by controlling on-off of the relays through control signals.
And for each path of signal to be tested (alternating current and direct current), controlling output through a control signal.
For example, "signal to be measured 01+" and "signal to be measured 01-" are controlled to be output by "control signal 01", and "signal to be measured 10+" and "signal to be measured 10-" are controlled to be output by "control signal 10". The output signal paths are both "Vin + signal" and "Vin-signal".
According to the system characteristics, the contact withstand voltage of the AC relay and the DC relay is more than 450V. Since the control signal is a 5V system, the relay also uses a 5VDC control signal to reduce intermediate level transitions. The selected relay of the system is G2RL-2A 5VDC of OMRON, the maximum contact withstand voltage of the contact of the relay of the type is more than or equal to 1000V, the control voltage is 5V, and the action voltage is 3.5V.
Automatic detection of distribution box output: automatic detection of the output of the distribution box is realized through the control of a single chip microcomputer and a data acquisition unit.
The single chip microcomputer control and data acquisition unit comprises an alternating current isolation conversion circuit, an AD sampling circuit, a channel selection circuit, a control signal generation circuit and the like, and the detailed diagram is shown in FIG. 3.
The measured signals Vin +, vin-are divided by precision resistors R9, R10 and R11 to obtain signals with the output range of 0-250 mV, the signals are isolated and amplified by an isolation amplifier AMC1100, differential signals with the peak value range of +/-2V are output, the differential signals enter a differential-to-single-ended circuit formed by a low-noise operational amplifier OP184 and are converted into single-ended signals with the voltage of 0-2V, the signals are subjected to RMS-DC conversion through an RMS-DC chip AD8436 and are converted into effective direct-current voltage, the effective direct-current voltage is sent to an ADC for sampling, and the ADC adopts a self-contained 12-bit ADC in a singlechip C8051F 040.
The signal under test and the sample measurement circuit are isolated by an isolation amplifier AMC1100 to ensure test safety. AMC1100 is a precision isolation amplifier (precision < 0.5%) with high field noise immunity silicon dioxide (SiO 2) barrier to isolate the output from the input circuit. The isolation gate is certified to provide current isolation up to 4250VPEAK according to UL1577 and IEC60747-5-2 standards. When used with an isolated power supply, the device prevents noise currents on the common mode high voltage line from entering local ground and interfering with or damaging sensitive circuitry.
RMS-DC conversion is carried out through an RMS-DC chip AD8436, and effective value measurement of complex modulation waveform signals can be completed.
( Note: input range of the measured signal: AC/DC of 0-500V, if higher voltage needs to be tested, the divider resistors R9, R10 and R11 need to be replaced by calculation )
And (3) realizing driving output of the control signal: the control signal driving output circuit provides multi-path control driving output required by the central distribution box. Because the control mechanism of each path is the same, the schematic diagram of the single-path control signal driving output circuit is only given in fig. 4 for simplicity.
Automatic detection of distribution box output: automatic detection of the output of the distribution box is realized through the control of a single chip microcomputer and a data acquisition unit.
The single chip microcomputer control and data acquisition unit comprises an alternating current isolation conversion circuit, an AD sampling circuit, a channel selection circuit, a control signal generation circuit and the like, and the detailed diagram is shown in figure 3.
When the single chip microcomputer gives a 'control signal 1' to be effective, the relay is closed, and the 'output 1' and the input signal form a loop to be output to the central distribution box to control the distribution output of the central distribution box. The relay only needs to provide one grounding path, and the small relay TQ2-5V is adopted to meet the index.
And (3) testing the compatibility: the interface of the test equipment is designed into a standard socket, and comprises an alternating current socket, a direct current socket and a control signal socket. When the power supply and distribution system to be tested is connected, only the adaptive cables (such as the 'direct current', 'alternating current' and 'control signal' cables in fig. 5) need to be changed according to requirements, and the software can be adjusted slightly according to the difference of the power supply and distribution system to be tested to meet the test requirements of other projects.
A test flow chart: as shown in fig. 6, before the index test of the selected channel is performed, the test system first sends a command of "close all relays", samples the output port after delaying for 10ms, and determines whether all relays are in a closed state by inquiring whether the sampling value of the output port is zero, so as to ensure that all relays are in an off state before the relays of the selected channel are opened (turned on), thereby avoiding the occurrence of a state that the previously turned-on relays are not turned off and the subsequent electrical appliances are turned on, thereby causing a short circuit phenomenon of two different power sources/voltages.

Claims (2)

1. An off-line automatic detection method for a central distribution box of a radar comprises a multi-channel switching unit, a single chip microcomputer control and numerical control acquisition unit and a distribution control signal drive output module, wherein the multi-channel switching unit comprises a first alternating current relay group, a second alternating current relay group, a third alternating current relay group and a direct current relay group, the single chip microcomputer control and numerical control acquisition unit comprises an isolation transformation module, an A/D module, a RS232 interface and a single chip microcomputer, the isolation transformation module is connected with the A/D module, the A/D module is respectively connected with the RS232 interface and the single chip microcomputer, and the RS232 interface is respectively connected with the single chip microcomputer and a computer; one end of the first alternating current relay is connected with a No. 1-10 alternating current output port of the radar central distribution box, and the other end of the first alternating current relay is connected with the isolation transformation module; one end of the second alternating current relay group is connected with an alternating current output port No. 11-20 of the radar central distribution box, and the other end of the second alternating current relay group is connected with the isolation transformation module; one end of the third alternating current relay group is connected with a No. 21-30 alternating current port of the radar central distribution box, and the output of the other end of the third alternating current relay group is connected with the isolation transformation module; one end of the direct current relay group is connected with a No. 1-10 direct current output port of the radar central distribution box, and the other end of the direct current relay group is connected with the A/D module; the single chip microcomputer is respectively connected with the first alternating current relay, the second alternating current relay group, the third alternating current relay group and the direct current relay group to provide channel control signals for the first alternating current relay group, the second alternating current relay group, the third alternating current relay group and the direct current relay group, and is connected with the power distribution control signal driving output module to provide power distribution control signals for the single chip microcomputer; the RS232 interface is connected with the computer, receives a test command of the computer and sends a test result to the computer; the method is characterized by comprising the following steps:
step 1: the single chip microcomputer control and numerical control acquisition unit receives a test command sent by a computer, and outputs a power distribution control signal to the power distribution control signal drive output module after being processed by the internal single chip microcomputer, and the power distribution control signal drive output module supplies the power distribution control signal sent by the single chip microcomputer to each power distribution working state required by the radar central distribution box after voltage and current drive is carried out on the power distribution control signal;
step 2: the single chip microcomputer outputs a channel selection signal to a corresponding relay group, the corresponding relay group is opened, and an alternating current/direct current signal to be tested is input to the single chip microcomputer control and numerical control acquisition unit;
and 3, step 3: the single chip microcomputer control and numerical control acquisition unit samples the AC/DC signal to be tested;
and 4, step 4: the sampled signal is transmitted to the computer through RS 232.
2. The off-line automatic detection method for the radar central distribution box according to claim 1, wherein the sampling of the to-be-detected alternating current signal by the single chip microcomputer control and numerical control acquisition unit in the step 3 is as follows: the measured signals Vin + and Vin-are subjected to voltage division through precision resistors R9, R10 and R11 to obtain signals with an output range of 0-250 mV, the signals are isolated and amplified through an isolation amplifier AMC1100, differential signals with a peak value range of +/-2V are output, the differential signals are converted into single-ended signals with a voltage of 0-2V through a differential-to-single-ended circuit formed by a low-noise operational amplifier OP184, the signals are subjected to RMS-DC conversion through an RMS-DC chip AD8436 and converted into effective direct-current voltage, the effective direct-current voltage is sent to an ADC for sampling, and the ADC adopts a self-contained 12-bit ADC in a single chip microcomputer C8051F 040.
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