CN110389278B

CN110389278B - B2B connector assembly detection device that targets in place

Info

Publication number: CN110389278B
Application number: CN201910706562.0A
Authority: CN
Inventors: 王海来
Original assignee: Intelligent Automation Equipment Zhuhai Co Ltd
Current assignee: Intelligent Automation Equipment Zhuhai Co Ltd
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2024-06-14
Anticipated expiration: 2039-08-01
Also published as: CN110389278A

Abstract

The invention provides the B2B connector assembly in-place detection device which has the advantages of simple structure, low cost, quick test and capability of early warning whether the connection assembly is correct or not. The invention comprises a comparison reference voltage source (1), two comparators (2), an AND gate judgment (3) and an inverter (4), wherein the comparison reference voltage source (1) respectively inputs two different voltages to the two comparators (2), the output ends of the two comparators (2) are connected with the AND gate judgment (3), the AND gate judgment (3) is connected with the inverter (4), the inverter (4) outputs a test result to display, the inverting ends of the two comparators (2) respectively lead out test needles (5), and the two test needles (5) are respectively connected to metal spring plates at two ends of a B2B connector to be tested. The invention can be applied to the field of testing.

Description

B2B connector assembly detection device that targets in place

Technical Field

The invention relates to the field of testing, in particular to a B2B connector assembly in-place detection device.

Background

B2B connectors are very widely used in small mobile terminal products, where a large number of B2B connectors are provided on the PCBA (printed circuit board assembly) of the mobile terminal product, and when performing a functional test of the PCBA, the PCBA must couple some functional peripherals through the B2B connectors. The assembly method is mainly divided into automatic and manual according to the testing method, wherein the automatic method is generally to connect to a B2B socket on the PCBA through a pin block, and the manual method is to buckle one end of the peripheral device and one end of the PCBA together through B2B through manual operation. In the case of PCBA testing, the entire operation will be repeated continuously. However, in either test mode, reliable connection of the connector is very important. However, due to the compact structure and small size of the connector, abnormal connection is easy to occur in repeated operation, especially dislocation connection is easy to occur in manual connection, and the difference between correct connection and incorrect connection can be clearly seen in the assembly diagram of the connector shown in fig. 1. When dislocation connection occurs, the circuit board is easy to be short-circuited when the system is electrified, even the whole system is damaged, and great loss is caused.

At present, a method for testing the B2B connector in place is not scientific and economical, and whether the connection is in place or not can only be identified by using technologies such as boundary scanning, open-short circuit testing and the like before the tested product is powered on after the B2B connector is assembled. However, the boundary scanning has high cost, high technical requirements and poor universality; the technical method of open-short circuit test needs to use instruments and other means, the test time is long, and if the number of test points to be verified is relatively large, the test time is prolonged.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the B2B connector assembly in-place detection device which has the advantages of simple structure, low cost, quick test and capability of early warning whether the connection assembly is correct or not.

The technical scheme adopted by the invention is as follows: the device comprises a comparison reference voltage source, two comparators, an AND gate judgment and an inverter, wherein the comparison reference voltage source inputs two different voltages to the two comparators respectively, the output ends of the two comparators are connected with the AND gate judgment, the AND gate judgment is connected with the inverter, the inverter outputs a test result to display that the inverting ends of the two comparators are respectively led out of test pins, and the two test pins are respectively connected to metal spring plates at two ends of a B2B connector to be tested.

According to the scheme, in the testing process of the B2B connector, different voltages are led into the comparator through the comparison reference voltage source, the testing needle is led out from the opposite phase end of the comparator and is connected to the metal elastic pieces at the two ends of the B2B connector to be tested, when the male seat and the female seat of the B2B connector are buckled together, if the connectors are well connected, the metal elastic pieces on the connectors are in short circuit, the two testing needles are at the same potential, the output pins of the two comparators output two high levels, and after the two high levels are simultaneously input into the AND gate judging logic for comparison, the output pin judged by the AND gate outputs one high level; if any pin contact of the two test pins is bad due to assembly or other reasons, a low level is output, so that whether the B2B connector is buckled normally or not can be detected rapidly before power-on, early warning is sent in advance, and damage to a circuit board is avoided; the structure is simple and the cost is low.

Further, the comparison reference voltage source comprises two groups of 150mV reference voltage sources and two groups of 300mV reference voltage sources, and the 150mV reference voltage sources and the 300mV reference voltage sources each comprise an operational amplifier, and the model of the operational amplifier is LM358. Therefore, the same voltage loaded by the two test pins can be ensured to be the same by adopting the same two groups of reference voltage source inputs, and the comparability and the reliability of the test result are ensured.

Still further, the comparator is a differential voltage comparator, model LM339. Therefore, the characteristics of small offset voltage, wide voltage range, large common mode range, flexible selection of the electric potential of the output end and the like of the four-way differential voltage comparator are utilized, so that the reliability of the whole device is better, and the efficiency is higher.

Still further, the inverter is connected with LED early warning pilot lamp. Therefore, through the arrangement of the LED early warning indicator lamp, quick and reliable feedback can be intuitively and conveniently provided for detection personnel, and when B2B connection is abnormal, the reaction can be quickly made.

Finally, the inverter is also externally connected with an MCU. Therefore, through the connection setting of the MCU, the output result of the inverter can be sent to the MCU, and through MCU early warning and message notification, reference is provided for background control personnel, and the event can be recorded.

Drawings

FIG. 1 is a schematic illustration of a B2B connector assembly normal and abnormal;

FIG. 2 is a schematic diagram of the test needle of the present invention;

FIG. 3 is a simplified connection block diagram of the present invention;

FIG. 4 is a schematic circuit diagram of a 150mV reference voltage source;

FIG. 5 is a schematic circuit diagram of a 300 mV reference voltage source;

FIG. 6 is a schematic circuit diagram of the comparator;

FIG. 7 is a schematic circuit diagram of the AND gate determination;

fig. 8 is a schematic circuit diagram of the inverter.

Detailed Description

As shown in fig. 1 to 8, the present invention includes a comparison reference voltage source 1, two comparators 2, an and gate judgment 3, and an inverter 4, where the comparison reference voltage source 1 inputs two different voltages to the two comparators 2, the output ends of the two comparators 2 are connected with the and gate judgment 3, the and gate judgment 3 is connected with the inverter 4, the inverter 4 outputs a test result to show that the inverting ends of the two comparators 2 are respectively led out with a test needle 5, and the two test needles 5 are respectively connected to metal spring plates at two ends of the B2B connector to be tested. The comparison reference voltage source 1 comprises two groups of 150mV reference voltage sources and two groups of 300mV reference voltage sources, and the 150mV reference voltage sources and the 300mV reference voltage sources comprise an operational amplifier, and the model of the operational amplifier is LM358. The comparator 2 is a differential voltage comparator, and the model is LM339. The inverter 4 is connected with an LED early warning indicator lamp. The inverter 4 is also externally connected with an MCU.

The present invention introduces two voltage sources of 150mV and 300mV to the comparator and pulls out two test pins from the inverting terminal of the comparator, as shown in FIG. 3, AJ_GND1 and AJ_GND2 are test points to be dropped. The test points are respectively arranged on the metal shrapnel at two ends of the B2B connector, when the two B2B connectors are buckled together, even if the connectors are well connected, the metal shrapnels on the connectors are shorted together, AJ_GND1 and AJ_GND2 are in the same potential, the 1 pins AJ_OUT1 and AJ_OUT2 of the LM339 output two high levels, the two high levels are simultaneously input to the AND gate judgment logic for comparison, the output end OUT1 outputs one high level, as shown in figure 7, and if any pin of the AJ_GND1 and the J_GND2 is in poor contact due to assembly or other reasons, the OUT1 outputs one low level. The level signal output by the AND gate judgment is finally sent to the inverter, as shown in fig. 8, the finally output signal OUT1 can be used for driving the LED early warning indicator lamp, and can be sent to the MCU of the test fixture to execute early warning and message notification and record events, so that protection is realized.

The technology of the invention is that the open-short circuit test is completed when the PCBA is connected with other peripheral equipment, early warning can be carried out before the tested system is powered on, the test time can be greatly shortened and the test efficiency can be improved after the B2B is detected before the powered on, and the test can be used independently without the detection by means of instruments and equipment.

Claims

1. A B2B connector assembly in place detection device, characterized by: the device comprises a comparison reference voltage source (1), two comparators (2), an AND gate judgment (3) and an inverter (4), wherein the comparison reference voltage source (1) respectively inputs two different voltages to the two comparators (2), the output ends of the two comparators (2) are connected with the AND gate judgment (3), the AND gate judgment (3) is connected with the inverter (4), the inverter (4) outputs a test result to display, the two inverting ends of the comparators (2) respectively lead out test needles (5), and the two test needles (5) are respectively connected to metal spring plates at two ends of a B2B connector to be tested.

2. The B2B connector assembly in place detection device of claim 1, wherein: the comparison reference voltage source (1) comprises two groups of 150mV reference voltage sources and two groups of 300mV reference voltage sources, and the 150mV reference voltage sources and the 300mV reference voltage sources comprise an operational amplifier, and the model of the operational amplifier is LM358.

3. The B2B connector assembly in place detection device of claim 1, wherein: the comparator (2) is a differential voltage comparator, and the model is LM339.

4. The B2B connector assembly in place detection device of claim 1, wherein: the inverter (4) is connected with an LED early warning indicator lamp.

5. The B2B connector assembly in place detecting apparatus of claim 4, wherein: the inverter (4) is also externally connected with an MCU.