CN109387737B - Needle seat and plastic shell connection state detection system - Google Patents
Needle seat and plastic shell connection state detection system Download PDFInfo
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- CN109387737B CN109387737B CN201811457841.XA CN201811457841A CN109387737B CN 109387737 B CN109387737 B CN 109387737B CN 201811457841 A CN201811457841 A CN 201811457841A CN 109387737 B CN109387737 B CN 109387737B
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- 238000001514 detection method Methods 0.000 title claims abstract description 62
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
Classifications
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application relates to a system for detecting the connection state of a needle seat and a plastic shell, which comprises the needle seat, the plastic shell, a detection circuit and a main control circuit, wherein the needle seat is provided with a pin, the plastic shell is provided with a corresponding number of jacks, two jacks of the plastic shell are in short connection through a wire harness, the pin of the needle seat corresponding to the two jacks in short connection is connected with the detection circuit, the detection circuit is connected with the main control circuit, and the detection circuit is used for detecting the connection state of the needle seat and the plastic shell and outputting a corresponding level signal to the main control circuit according to the connection state; the main control circuit is used for receiving the level signal sent by the detection circuit and obtaining a detection result according to the level signal. The detection circuit outputs high-low level signals for the main control circuit to judge according to the detected connection state of the needle seat and the plastic shell, and the main control circuit can accurately judge whether the needle seat and the plastic shell are successfully connected according to the received high-low level signals, so that the detection accuracy is high.
Description
Technical Field
The application relates to the technical field of port detection, in particular to a needle seat and plastic shell connection state detection system.
Background
The connection among the internal circuit boards of the controller and the collection of a plurality of signals are all carried out by the connection mode of the wire harness, the needle seat and the plastic shell. During the installation or testing of the controller, if the needle seat is not connected with the plastic shell, the controller directly works, and other working modules can be damaged due to abnormal work. For example, when the project is high-power motor drive, the motor drive normally works and needs to collect U, V, W three-phase current, the magnitude of the current is transmitted through a connection mode of a wire harness, a needle seat and a plastic shell, when the needle seat is not successfully inserted into the plastic shell in the test process, a main control circuit does not actually detect a current value, but the current in an IGBT module is continuously increased, so that the IGBT module is in overcurrent protection, and if the overcurrent protection is not timely, the IGBT will burst. Traditional needle file and plastic case are connected and can only judge the connection state through artifical naked eye, easily appear misjudgement's problem, and the detection accuracy is low.
Disclosure of Invention
Based on this, it is necessary to provide a needle stand and plastic shell connection state detection system with high detection accuracy, aiming at the problems that the connection state of the traditional needle stand and plastic shell can only be judged by naked eyes, misjudgment is easy, and the detection accuracy is low.
The connection state detection system of the needle seat and the plastic shell comprises a needle seat, a plastic shell, a detection circuit and a main control circuit, wherein the needle seat is provided with contact pins, the plastic shell is provided with a corresponding number of jacks, two jacks of the plastic shell are in short connection through a wire harness, the contact pins of the needle seat corresponding to the two jacks in short connection are connected with the detection circuit, the detection circuit is connected with the main control circuit,
The detection circuit is used for detecting the connection state of the needle seat and the plastic shell and outputting a corresponding level signal to the main control circuit according to the connection state;
The main control circuit is used for receiving the level signal sent by the detection circuit and obtaining a detection result according to the level signal.
According to the needle seat and plastic shell connection state detection system, two jacks in the plastic shell are in short connection through one wire harness, the contact pins at corresponding positions of the needle seat are connected with the detection circuit, the detection circuit outputs high-low level signals according to the detected connection state of the needle seat and the plastic shell for judging by the main control circuit, and the main control circuit can accurately obtain the detection result of whether the needle seat and the plastic shell are successfully connected or not according to the received high-low level signals, so that the detection accuracy is high.
Drawings
FIG. 1 is a schematic view of a conventional hub, plastic housing and harness in one embodiment;
fig. 2 is a simplified schematic diagram of a hub in one embodiment;
FIG. 3 is a simplified schematic diagram of a molded case in one embodiment;
FIG. 4 is a diagram of a detection circuit in one embodiment;
fig. 5 is a diagram showing a structure of a detection circuit in another embodiment.
Detailed Description
The application scene of the application specifically comprises: as shown in fig. 1, is a schematic view of the needle hub, plastic housing and harness currently in use. In fig. 1, a is a pin holder, and pins below the pin holder are connected with bonding pads on a PCB board; b in fig. 1 is a plastic case; in fig. 1, C is a wire harness. As shown in fig. 2, which is a simplified schematic diagram of the hub, 8 elongated strips are partially pins of the hub, the uppermost pin (the pin on the hub connected to the PCB is referred to as a pin) is denoted as D, and the lowermost pin is denoted as E; as shown in FIG. 3, the schematic diagram is simplified for the plastic shell, 8 elongated strip parts are jacks for connecting the plastic shell with the needle seat, the jack at the upper end is denoted as F, the jack at the lower end is denoted as G, the vertical elongated strip part is a connecting wire for shorting two jacks and denoted as H, and further, the structure of the jacks at two sides of the plastic shell is shorted by H, and the structure is also applicable to the occasion that the structure of the jacks at two sides of the plastic shell is shorted by H.
In one embodiment, the system for detecting the connection state of the needle seat and the plastic shell comprises the needle seat, the plastic shell, a detection circuit and a main control circuit, wherein the needle seat is provided with pins, the plastic shell is provided with a corresponding number of jacks, two jacks of the plastic shell are in short circuit through a wire harness, the needle seat is connected with the detection circuit corresponding to the two jacks in short circuit, the detection circuit is connected with the main control circuit, and the detection circuit is used for detecting the connection state of the needle seat and the plastic shell and outputting corresponding level signals to the main control circuit according to the connection state; the main control circuit is used for receiving the level signal sent by the detection circuit and obtaining a detection result according to the level signal.
Specifically, the contact pin used for detecting the needle seat is the contact pin added on the basis of the original needle seat; the jacks of the plastic shell, which are applied to detection, are jacks added on the basis of the original needle seat. In this embodiment, two pins are added on the basis of the number of pins and jacks used in the original needle stand and the plastic case, and two jacks, namely, two pins and two jacks at the outermost side are used for detecting the connection state, and the use functions of other pins are not affected. Assuming that the original needle seat with 6 needles is connected with the plastic shell with 6 holes, the needle seat with 8 needles and the plastic shell with 8 jacks are added for two needles and two jacks (D, E is an added contact pin, F, G is an added jack), further, the contact pin is not limited to be added at the outermost side of the original needle seat, the contact pin can be arranged at any middle position, the jacks are added at positions corresponding to the plastic shell, and the use functions of other needles are not affected.
According to the needle seat and plastic shell connection state detection system, two jacks in the plastic shell are in short connection through one wire harness, the contact pins at corresponding positions of the needle seat are connected with the detection circuit, the detection circuit outputs high-low level signals according to the detected connection state of the needle seat and the plastic shell for judging by the main control circuit, and the main control circuit can accurately obtain the detection result of whether the needle seat and the plastic shell are successfully connected or not according to the received high-low level signals, so that the detection accuracy is high.
In one embodiment, as shown in fig. 4, pins corresponding to the two shorted jacks of the hub are a first pin and a second pin respectively, the detection circuit comprises a voltage follower and a voltage comparator, the non-inverting input end of the voltage follower is connected with a first external power supply, the inverting input end of the voltage follower is grounded, the output end of the voltage follower is connected with the inverting input end of the voltage comparator, the non-inverting input end of the voltage comparator is connected with the second external power supply and the first pin of the hub, the first pin of the hub is shorted with the second pin of the hub through a wire harness of the plastic shell, the second pin of the hub is grounded, and the output end of the voltage comparator is connected with the master control circuit.
Specifically, the voltage follower is an electronic component for realizing that the output voltage follows the change of the input voltage, in this embodiment, a reference voltage of 3.3V is provided, a stable 3.3V voltage is output through the voltage follower, during detection, the E pin (corresponding to the second pin) in fig. 4 is grounded, the D pin (corresponding to the first pin) is pulled up to 5V, and the reference voltage is compared with the 3.3V voltage output by the voltage follower. The specific detection process comprises the following steps: when the plastic shell is inserted into the needle seat, the plug switch is closed (namely the short circuit wire harness H of the jack pulls down the potential of the pin D to the ground), the voltage of the non-inverting input end of the voltage comparator U31-A is smaller than the voltage of the inverting input end, and a low level is output; when the plastic shell is pulled out of the needle seat, the plug switch is turned off, the voltage of the non-inverting input end of the voltage comparator is larger than that of the inverting input end, and a high level is output, namely when the needle seat and the plastic shell are successfully connected, a low level signal is output to the main control circuit; when the connection between the needle seat and the plastic shell fails, a high-level signal is output to the main control circuit.
In one embodiment, as shown in fig. 5, the detection circuit further includes a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected to the first external power supply, the other two ends of the first voltage dividing resistor are connected to the in-phase input end of the voltage follower, one end of the second voltage dividing resistor is connected to the common end of the voltage follower and the first voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded.
Specifically, the voltage dividing resistor refers to the resistance of a conductor connected in series with a certain circuit, and when the total voltage is unchanged, a voltage dividing resistor is connected in series with a certain circuit, so that the voltage dividing function can be realized, and a part of the voltage is reduced on the voltage dividing resistor, so that the voltage across the part of the circuit is reduced. In this embodiment, the first voltage dividing resistor R8 and the first voltage dividing resistor R7 divide the voltage, and a voltage of 3.3V is generated at the non-inverting input terminal (pin 5) of the voltage follower U31-B, and further, the pins 6 and 5 of the U31-B are equipotential, and the pins 7 and 6 of the U31-B are equipotential.
In one embodiment, the detection circuit further includes a first filter capacitor, and the first filter capacitor and the second voltage dividing resistor are connected in parallel. Specifically, the first filter capacitor C2 is configured to filter noise in the input voltage, so as to ensure stability of the input voltage of the voltage follower.
In one embodiment, the detection circuit further includes a second filter capacitor, and the inverting input terminal of the voltage follower is grounded through the second filter capacitor. Specifically, the second filter capacitor C1 is configured to filter noise in the output voltage, so as to ensure stability of the output voltage of the voltage follower.
In one embodiment, the detection circuit further comprises a first current limiting resistor, and an output end of the voltage follower is connected with an inverting input end of the voltage comparator through the first current limiting resistor. Specifically, a resistor with a suitable resistance value is selected as the first current limiting resistor R3 to limit the current of the branch circuit, so as to prevent the voltage comparator U31-a connected in series from being burnt out due to excessive current.
In one embodiment, the detection circuit further comprises a third voltage dividing resistor and a fourth voltage dividing resistor, one end of the third voltage dividing resistor is connected with the second external power supply, the other end of the third voltage dividing resistor is connected with the non-inverting input end of the voltage comparator, one end of the fourth voltage dividing resistor is connected with the common end of the voltage comparator and the third voltage dividing resistor, and the other end of the fourth voltage dividing resistor is connected with the first pin of the needle seat.
Specifically, the resistance of the third voltage dividing resistor R4 is equal to the resistances of the first voltage dividing resistor R8 and the second voltage dividing resistor R7, and the resistance of the fourth voltage dividing resistor R3 is smaller than the resistance of the third voltage dividing resistor R4.
In one embodiment, the detection circuit further comprises a resistor, one end of the resistor is connected with the second pin of the needle seat, the other end of the resistor is grounded, and the first pin of the needle seat and the second pin of the needle seat are in short circuit through the wire harness. Specifically, the resistor is used for protecting the second pin of the needle seat.
In one embodiment, the detection circuit further comprises a second current limiting resistor, and the input end of the voltage comparator is connected with the main control circuit through the second current limiting resistor. Specifically, a resistor with a proper resistance value is selected as the second current limiting resistor R2 to limit the current of the branch circuit, so as to prevent the master control circuit connected in series from being burnt out due to excessive current.
In one embodiment, the detection circuit further comprises a pull-up resistor, one end of the pull-up resistor is connected with the output end of the voltage comparator, and the other end of the pull-up resistor is connected with a third external power supply. Specifically, the pull-up resistor R1 is used for pulling up the level signal output by the voltage comparator and simultaneously plays a role in current limiting.
In a detailed embodiment, as shown in fig. 5, the connection state detection system of the hub and the plastic case comprises a hub, a plastic case, a voltage follower U31-B, a voltage comparator U31-A, a first voltage dividing resistor R8, a second voltage dividing resistor R7, a first filter capacitor C2, a second filter capacitor C1, a first current limiting resistor R3, a third voltage dividing resistor R4, a fourth voltage dividing resistor R3, a resistor R9, a second current limiting resistor R2 and a pull-up resistor R1, one end of the first voltage dividing resistor R8 is connected with a first external power supply, the other second end of the first voltage dividing resistor R8 is connected with the common end of the voltage follower U31-B, the other end of the second voltage dividing resistor R7 is grounded, the first filter capacitor C2 is connected with the second voltage dividing resistor R7 in parallel, the inverting input end of the voltage follower U31-B is grounded through the second filter capacitor C1, the output end of the voltage follower U31-B is connected with the first voltage follower U31-B through the first current limiting resistor R3, the other end of the inverting end of the voltage follower U31-B is connected with the common end of the hub R3, the other end of the voltage follower U31-B is connected with the other end of the voltage comparator U31, the other end of the common end of the voltage follower R2 is connected with the common end of the voltage follower R3, the other end of the voltage follower R31 is connected with the common end of the voltage comparator R2, the other end of the voltage comparator R3 is connected with the other end of the voltage comparator R3, and the other end of the voltage comparator R3 is connected with the other end of the common end of the voltage comparator R3 is connected with the voltage comparator R3, the other end is connected with a third external power supply, the pin 8 of the voltage comparator U31-A is connected with a fourth external power supply, and the pin 4 is grounded.
According to the needle seat and plastic shell connection state detection system, two jacks of the plastic shell for connection detection are short-circuited through one wire harness H, when the plastic shell is inserted into the needle seat, a plug switch is closed (namely the short-circuited wire harness H of the jacks pulls the potential of a pin D down to the ground), the potential of a pin 3 of a voltage comparator U31-A is smaller than the potential of a pin 2, and FO.CONNECT outputs a low level; when the plastic shell is pulled out of the needle seat, the plug switch is disconnected, namely the potential of the 3 pin of the voltage comparator U31-A is greater than the potential of the 2 pin when the first pin D and the second pin E are not connected, FO.CONNECT outputs a high level, namely when the needle seat and the plastic shell are successfully connected, a low level signal is output to the main control circuit; when the connection between the needle seat and the plastic shell fails, a high-level signal is output to the main control circuit. The connection state of the needle seat and the plastic shell can be accurately judged by the main control circuit through the output high-low level signals, the detection accuracy is high, the problem of misjudgment of naked eye detection is avoided, the control reliability of the main control circuit can be further ensured, the risk of damage to key devices of a controller where the main control circuit is located is reduced, and the cost is reduced.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The utility model provides a needle file and moulded case connection state detecting system, its characterized in that includes needle file, moulded case, detection circuit and master control circuit, be provided with the contact pin on the needle file, be provided with corresponding quantity jack on the moulded case, two of them jacks of moulded case pass through the pencil short circuit, the contact pin of needle file corresponding to two jacks of short circuit is first pin and second pin respectively, detection circuit includes voltage follower and voltage comparator, the homophase input of voltage follower inserts first external power supply, the reverse phase input ground of voltage follower, the output of voltage follower is connected the reverse phase input of voltage comparator, the homophase input of voltage comparator inserts second external power supply and the first pin of needle file, the first pin of needle file passes through the pencil short circuit of moulded case the second pin of needle file, the second pin ground connection of needle file, the output of voltage comparator is connected the master control circuit;
The detection circuit is used for detecting the connection state of the needle seat and the plastic shell and outputting a corresponding level signal to the main control circuit according to the connection state; when the needle seat and the plastic shell are successfully connected, the voltage comparator outputs a low-level signal to the main control circuit; when the connection between the needle seat and the plastic shell fails, the voltage comparator outputs a high-level signal to the main control circuit;
the main control circuit is used for receiving the high-low level signals sent by the detection circuit and obtaining detection results according to the high-low level signals.
2. The system for detecting the connection state of a needle stand and a plastic housing according to claim 1, further comprising a first voltage dividing resistor and a second voltage dividing resistor, wherein one end of the first voltage dividing resistor is connected to the first external power supply, the other two ends of the first voltage dividing resistor are connected to the in-phase input end of the voltage follower, one end of the second voltage dividing resistor is connected to the common end of the voltage follower and the first voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded.
3. The system for detecting the connection state of a needle holder and a plastic housing according to claim 2, further comprising a first filter capacitor, wherein the first filter capacitor and the second voltage dividing resistor are connected in parallel.
4. The system for detecting the connection state of a needle holder and a plastic housing according to claim 1, further comprising a second filter capacitor, wherein the inverting input terminal of the voltage follower is grounded through the second filter capacitor.
5. The system for detecting the connection state of a needle holder and a plastic housing according to claim 1, further comprising a first current limiting resistor, wherein the output terminal of the voltage follower is connected to the inverting input terminal of the voltage comparator through the first current limiting resistor.
6. The system for detecting the connection state of the needle stand and the plastic shell according to claim 1, further comprising a third voltage dividing resistor and a fourth voltage dividing resistor, wherein one end of the third voltage dividing resistor is connected with a second external power supply, the other end of the third voltage dividing resistor is connected with the in-phase input end of the voltage comparator, one end of the fourth voltage dividing resistor is connected with a common end of the voltage comparator and the third voltage dividing resistor, and the other end of the fourth voltage dividing resistor is connected with the first pin of the needle stand.
7. The system for detecting the connection state of a needle holder and a molded case as claimed in claim 6, wherein the resistance of the fourth voltage dividing resistor is smaller than the resistance of the third voltage dividing resistor.
8. The system of claim 6, further comprising a resistor, wherein one end of the resistor is connected to the second pin of the hub, the other end of the resistor is grounded, and the first pin of the hub and the second pin of the hub are shorted by a wire harness.
9. The system for detecting the connection state of a needle stand and a plastic housing according to claim 1, further comprising a second current limiting resistor, wherein the input end of the voltage comparator is connected with the main control circuit through the second current limiting resistor.
10. The system for detecting the connection state of the needle stand and the plastic housing according to claim 1, further comprising a pull-up resistor, wherein one end of the pull-up resistor is connected to the output end of the voltage comparator, and the other end of the pull-up resistor is connected to a third external power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811457841.XA CN109387737B (en) | 2018-11-30 | 2018-11-30 | Needle seat and plastic shell connection state detection system |
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| CN201811457841.XA CN109387737B (en) | 2018-11-30 | 2018-11-30 | Needle seat and plastic shell connection state detection system |
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| CN109387737A CN109387737A (en) | 2019-02-26 |
| CN109387737B true CN109387737B (en) | 2024-05-24 |
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| CN109387737B (en) * | 2018-11-30 | 2024-05-24 | 珠海格力电器股份有限公司 | Needle seat and plastic shell connection state detection system |
| CN110108975A (en) * | 2019-05-22 | 2019-08-09 | 广州高新兴机器人有限公司 | A kind of detection method and detection system for realizing the detection whether outer line cable of robot |
| CN111966033B (en) * | 2020-07-17 | 2021-09-28 | 苏州浪潮智能科技有限公司 | Detection system for connection state of high-density connector |
| CN113049987B (en) * | 2021-06-01 | 2021-08-03 | 北京博科测试***股份有限公司 | Monitoring module for monitoring online state of sensor in real time |
| CN113346304B (en) * | 2021-06-11 | 2023-03-21 | 上海智租物联科技有限公司 | Prevent two-wheeled electric motor car and power battery's of striking sparks connecting wire |
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| CN106740232A (en) * | 2017-01-23 | 2017-05-31 | 华霆（合肥）动力技术有限公司 | One kind control guidance circuit |
| CN206818778U (en) * | 2017-05-03 | 2017-12-29 | 长春捷翼汽车零部件有限公司 | Control and protection device on intelligent high reliability electric automobile cable |
| CN107422222A (en) * | 2017-06-14 | 2017-12-01 | 广州三晶电气股份有限公司 | A kind of photovoltaic DC-to-AC converter judges the circuit for detecting of fuse quality |
| CN207010221U (en) * | 2017-07-26 | 2018-02-13 | 上海华宿电气股份有限公司 | A kind of intelligent wireless controller switching equipment of fault detect |
| CN207488456U (en) * | 2017-07-31 | 2018-06-12 | 宝沃汽车（中国）有限公司 | Detecting system, battery management system and the vehicle of battery cathode relay status |
| CN109387737A (en) * | 2018-11-30 | 2019-02-26 | 珠海格力电器股份有限公司 | Needle seat and plastic shell connection state detection system |
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