CN214375131U

CN214375131U - Circuit test board

Info

Publication number: CN214375131U
Application number: CN202120089994.4U
Authority: CN
Inventors: 卢中华
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-10-08
Anticipated expiration: 2031-01-13

Abstract

The utility model discloses a circuit test platform, include: the base body is provided with an inner cavity; the detection instrument is arranged in the inner cavity, and the base body is provided with an observation opening communicated with the inner cavity; the overload protection module is arranged in the inner cavity and is electrically connected with the detection instrument; and the wiring terminal group is arranged on the base body, and the overload protection module is electrically connected with the wiring terminal group. The detecting instrument sets up in the inner chamber of base member, and detecting instrument integrates on the base member promptly, makes things convenient for the experiment operation to go on, need not to remove arrangement detecting instrument, makes the use more convenient. Simultaneously, through being provided with the overload protection module, the terminal group passes through overload protection module and detecting instrument electric connection, and the overload protection module can prevent to cause the condition emergence that too big voltage or electric current were applyed on detecting instrument by reasons such as wiring mistake, is favorable to protecting detecting instrument and avoids damaging, improves the reliability.

Description

Circuit test board

Technical Field

The utility model relates to a circuit test field, in particular to have a circuit test board.

Background

In the teaching process, in order to enhance the understanding and experience of students on the theoretical knowledge of the electronic circuit, the students can directly and manually carry out the operations of circuit connection, circuit test, circuit fault removal and the like in a training course. During actual operation, students use the wire to connect relevant devices on the test board to form a complete circuit, and use the detection instruments such as the ampere meter, the voltmeter and the ohmmeter to detect and record the circuit, so as to facilitate the subsequent experiment report. When the circuit has an accident problem, the detection instrument is also needed to be used for removing faults of the circuit.

In the prior art, the detection instrument needs to be moved and arranged before the experiment starts and after the experiment ends, so that the use is inconvenient. In addition, in the moving and arranging process, the detection instrument is easy to break down or damage due to collision and extrusion, so that the detection indication is inaccurate, and the experiment is influenced. Managing a large number of meters at the same time requires a great deal of time and effort.

In addition, when the detection instrument is connected and used, due to the reasons of less experience or inattention of students and the like, connection errors or gear errors of the detection instrument are easy to occur, and overlarge current or overlarge voltage is applied to the detection instrument, so that the detection instrument is burnt out, damaged and damaged.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a circuit test platform, it can avoid instrumentation to remove the arrangement to can protect instrumentation from damaging.

According to the utility model discloses a circuit test platform, include: a base body provided with an inner cavity; at least one instrumentation disposed in the inner cavity, the base having an observation opening communicating with the inner cavity; the overload protection module is arranged in the inner cavity and is electrically connected with the detection instrument; and the wiring terminal group is arranged on the base body, and the overload protection module is electrically connected with the wiring terminal group.

According to the utility model discloses circuit test platform has following beneficial effect at least: the detecting instrument sets up in the inner chamber of base member, and detecting instrument integrates on the base member promptly, makes things convenient for the experiment operation to go on, need not to remove arrangement detecting instrument, makes the use more convenient. Simultaneously, through being provided with the overload protection module, the terminal group passes through overload protection module and detecting instrument electric connection, and the overload protection module can prevent to cause the condition emergence that too big voltage or electric current were applyed on detecting instrument by reasons such as wiring mistake, is favorable to protecting detecting instrument and avoids damaging, improves the reliability.

According to some embodiments of the utility model, overload protection module is including all setting up comparing unit, switch element and the reference voltage unit in the inner chamber, comparing unit's first input with binding post group electric connection, comparing unit's second input with reference voltage unit electric connection, comparing unit's output with switch element's control end is connected, binding post group passes through switch element with detecting instrument connects.

According to some embodiments of the present invention, the comparison unit includes an operational amplifier U2, a resistor R4 and a resistor R5, one end of the resistor R4 and the connection terminal set, the other end of the resistor R4 respectively with the first input terminal of the operational amplifier U2 and one end of the resistor R5, the other end of the resistor R5 is grounded, the second input terminal of the operational amplifier U2 is connected to the reference voltage unit, the output terminal of the operational amplifier U2 is connected to the control terminal of the switch unit.

According to some embodiments of the present invention, the switch unit includes switch tube Q1 and resistance R6, switch tube Q1 the input with the binding post group link, switch tube Q1's output with instrumentation connects, switch tube Q1's control end respectively with the output of comparing unit and resistance R6 connect, resistance R6's other end ground connection.

According to the utility model discloses a few embodiments, detecting instrument is provided with the gear adjusting part, the gear adjusting part with the reference voltage unit connection is in order to adjust the output voltage size of reference voltage unit.

According to some embodiments of the present invention, the reference voltage unit comprises a transfer switch, a voltage stabilization chip, a resistor R1, a resistor R2, and a resistor R3, and the gear adjuster is in transmission connection with the transfer switch; the voltage stabilizing chip is connected with one end of the resistor R1, and the other end of the resistor R1 is respectively connected with a second input end of the comparison unit and a contact of the change-over switch; a first contact of the change-over switch is connected with one end of the resistor R2, and a second contact of the change-over switch is connected with one end of the resistor R3; the other end of the resistor R2 and the other end of the resistor R3 are grounded.

According to some embodiments of the utility model, the binding post group includes two at least binding post, still include with the pilot lamp that binding post one-to-one is connected, the pilot lamp sets up on the base member.

According to some embodiments of the utility model, still including setting up power supply connecting seat and power supply terminal group on the base member, the power supply connecting seat can be connected with outside power module detachably, the power supply connecting seat with power supply terminal group electric connection.

According to some embodiments of the utility model, still include the fuse, the power supply connecting seat passes through the fuse with power supply terminal group electric connection.

According to some embodiments of the utility model, be provided with on the base member and dismantle connection structure and bread board, can dismantle connection structure can be connected with outside circuit board module detachably.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

fig. 2 is a circuit diagram of an overload protection module according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

As shown in fig. 1, the circuit testing platform according to the embodiment of the present invention includes: a base body 100, the base body 100 being provided with an inner cavity; at least one test meter 200, the test meter 200 being disposed in the internal cavity, the base 100 being provided with an observation opening 110 communicating with the internal cavity; the overload protection module 300 is arranged in the inner cavity, and the overload protection module 300 is electrically connected with the detection instrument 200; the terminal set 400 is disposed on the substrate 100, and the overload protection module 300 is electrically connected to the terminal set 400.

The detecting instrument 200 is arranged in the inner cavity of the base body 100, namely the detecting instrument 200 is integrated on the base body 100, so that the experiment operation is convenient to carry out, the detecting instrument 200 does not need to be moved and arranged, and the use is more convenient. Meanwhile, by providing the overload protection module 300, the connection terminal set 400 is electrically connected to the detection instrument 200 through the overload protection module 300, and the overload protection module 300 can prevent the occurrence of the situation that an excessive voltage or current is applied to the detection instrument 200 due to reasons such as wiring errors, and is beneficial to protecting the detection instrument 200 from being damaged and improving the reliability.

The substrate 100 may be an embodiment of an object such as a table. The detection instrument 200 may be a voltmeter, an ammeter, an ohmmeter or other devices, preferably, a dc voltmeter, an ac voltmeter, a dc ammeter, an ac ammeter and an ohmmeter are disposed on the substrate 100, the ac voltmeter and the ac ammeter may be processed by disposing a rectifier, and the connection terminal group 400, the rectifier, the overload protection module 300 and the detection instrument 200 are sequentially connected. The terminal group 400 may be a device including a plurality of plug terminals or a plurality of connection pins or the like that can be detachably connected to an external connection wire.

Referring to fig. 2, in some embodiments of the present invention, the overload protection module 300 includes a comparison unit 310, a switch unit 320 and a reference voltage unit 330 all disposed in the inner cavity, a first input end of the comparison unit 310 is electrically connected to the connection terminal set 400, a second input end of the comparison unit 310 is electrically connected to the reference voltage unit 330, an output end of the comparison unit 310 is connected to a control end of the switch unit 320, and the connection terminal set 400 is connected to the detection instrument 200 through the switch unit 320.

The voltage or current of the wiring terminal group 400 forms a detection signal and is input to the first input end of the comparison unit 310, the reference voltage output by the reference voltage unit 330 is input to the second input end of the comparison unit 310, the comparison unit 310 compares the voltage of the first input end with the voltage of the second input end, when the voltage of the wiring terminal group 400 is greater than the reference voltage, the comparison unit 310 controls the switch unit 320 to be turned off, which is equivalent to the disconnection between the wiring terminal group 400 and the detection instrument 200, so that the excessive voltage or current can be prevented from being applied to the detection instrument 200, the effect of protecting the detection instrument 200 is realized, and the damage of the detection instrument 200 caused by a wrong wiring line and other reasons can be avoided.

Referring to fig. 2, in some embodiments of the present invention, the comparing unit 310 includes an operational amplifier U2, a resistor R4 and a resistor R5, one end of the resistor R4 is connected to the connection terminal set 400, the other end of the resistor R4 is connected to the first input terminal of the operational amplifier U2 and one end of the resistor R5, the other end of the resistor R5 is grounded, the second input terminal of the operational amplifier U2 is connected to the reference voltage unit 330, and the output terminal of the operational amplifier U2 is connected to the control terminal of the switching unit 320.

The voltage or current inputted from the connection terminal set 400 is converted by the resistor R4 and the resistor R5 to form a detection voltage and inputted to the first input terminal of the operational amplifier U2, and the reference voltage generated by the reference voltage unit 330 is inputted to the second input terminal of the operational amplifier U2. Taking fig. 2 as an example, the first input terminal is an inverting input terminal, the second input terminal is a non-inverting input terminal, when the detection voltage is smaller than the reference voltage, the operational amplifier U2 outputs a high level to turn on the switch unit 320, the voltage or current input by the connection terminal set 400 can be normally applied to the detection instrument 200, and the detection instrument 200 normally indicates a number; when the detection voltage is greater than the reference voltage, the operational amplifier U2 outputs a low level to turn off the switch unit 320, so that the connection terminal set 400 and the detection instrument 200 are disconnected, thereby protecting the detection instrument 200 from being damaged by an excessive voltage or current. Therefore, the comparison function is realized, and the structure is simple and convenient to implement.

Referring to fig. 2, in some embodiments of the present invention, the switch unit 320 includes a switch tube Q1 and a resistor R6, an input end of the switch tube Q1 is connected to the connection terminal set 400, an output end of the switch tube Q1 is connected to the detection instrument 200, a control end of the switch tube Q1 is connected to an output end of the comparison unit 310 and the resistor R6, and the other end of the resistor R6 is grounded.

The control end of the switch tube Q1 is connected with the output end of the comparison unit 310, and the comparison unit 310 can control the switch tube Q1 to be switched on or off by changing the output level, so that the switch function is realized, the structure is simple, and the implementation is convenient. The switching transistor Q1 may be implemented as a transistor or a fet.

Referring to fig. 1 and 2, in some embodiments of the present invention, the measuring instrument 200 is provided with a gear adjuster 210, and the gear adjuster 210 is connected to the reference voltage unit 330 to adjust the output voltage of the reference voltage unit 330.

The detecting instrument 200 is generally provided with a gear adjusting member, such as a knob, a shift lever, etc., in order to adapt to different detecting ranges, so that a user can select different detecting ranges according to the use requirement, and the number can be obtained more accurately. Because the maximum voltage and the maximum current that different detection ranges of instrumentation 200 can bear can be different, for this, be connected with reference voltage unit 330 through keeping off the position regulating part to adjust the reference voltage size of reference unit output when the user operates and keeps off the position regulating part, and then make the maximum voltage, the maximum current that the size adaptation instrumentation 200 of reference voltage can bear, realize under the condition of the different detection ranges of instrumentation 200, all can protect instrumentation 200 from damaging, be favorable to improving the reliability.

Referring to fig. 2, in some embodiments of the present invention, the reference voltage unit 330 includes a switch 331, a voltage stabilizing chip 332, a resistor R1, a resistor R2, and a resistor R3, the gear adjusting element 210 is in transmission connection with the switch 331, the voltage stabilizing chip 332 is connected to one end of the resistor R1, the other end of the resistor is connected to the second input terminal of the comparing unit 310 and the contact terminal of the switch 331, the first contact of the switch 331 is connected to one end of the resistor R2, the second contact of the switch 331 is connected to one end of the resistor R3, and the other end of the resistor R2 is grounded to the other end of the resistor R3.

The voltage regulator chip 332 outputs a stable voltage, and the voltage is divided and converted by the resistor R1 and the resistor R2 or the resistor R1 and the resistor R3 to form a reference voltage, which is input to the second input terminal of the comparing unit 310, so that the stable reference voltage can be provided to the comparing unit 310 for comparison. Meanwhile, the change-over switch 331 is in transmission connection with the gear adjusting piece 210, so that a user can drive the change-over switch 331 when operating the gear adjusting piece 210, and then the change-over switch 331 is pressed against the first contact or the second contact, namely the change-over resistor R1 is connected with the resistor R2, or the resistor R1 is connected with the resistor R3, and finally the effect of adjusting the size of the reference voltage is achieved.

The gear adjusting element 210 and the switch 331 can be in transmission connection by using a synchronous switch or a coaxial switch or the like.

Referring to fig. 1 and 2, in some embodiments of the present invention, the connection terminal set 400 includes at least two connection terminals 410, and further includes an indicator 500 connected to the connection terminals 410 in a one-to-one correspondence, wherein the indicator 500 is disposed on the base 100.

In the experimental process, when students use the connecting wires to construct a circuit and then perform test operation, circuit faults may occur, which may be caused by wrong connection of the connecting wires, aging of the connecting wires, non-conduction and the like. Through being provided with pilot lamp 500 and binding post 410 one-to-one and being connected, alright know when pilot lamp 500 lights that corresponding binding post 410 has the electric current to pass through to this can learn circuit behavior directly perceived fast, is favorable to making the troubleshooting more convenient, improves experimental efficiency.

Referring to fig. 1, in some embodiments of the present invention, the power supply connector base 120 and the power supply terminal set 130 are further included, the power supply connector base 120 is detachably connected to an external power supply module, and the power supply connector base 120 is electrically connected to the power supply terminal set 130.

Because when testing different circuit board modules, need provide the power supply voltage of equidimension not, through be provided with power supply connecting seat 120 on base member 100 to can change different power supply module according to the demand of experiment circuit board module, make things convenient for going on of experiment.

The power supply connection socket 120 may be provided with a socket, a connector, and the like to achieve the effect of detachable connection with the external power supply module. The external power supply module can be a transformer, a power adapter, a switching power supply and the like.

Referring to fig. 1, in some embodiments of the present invention, the power supply connector 120 further includes a fuse 600, and the power supply terminal set 130 is electrically connected to the power supply connector 120 through the fuse 600.

Through being provided with fuse 600 to can appear the condition such as short circuit at whole circuit, when leading to the too big electric current of external module input, fuse 600 can the fusing cut the power supply, avoids the unexpected condition to appear, is favorable to improving security and reliability.

Referring to fig. 1, in some embodiments of the present invention, the base 100 is provided with a detachable connection structure 140 and a bread board 700, and the detachable connection structure 140 can be detachably connected with an external circuit board module.

To the real standard course of difference, generally need use different circuit board modules to carry out the experiment operation, consequently, through be provided with on base member 100 can dismantle connection structure 140 to the circuit board module that the fixed experiment was used is favorable to making the wiring operation more convenient. Meanwhile, the bread board 700 is arranged on the base body 100, so that the wiring requirement of a complex circuit can be met, and the experimental efficiency can be improved.

The detachable connection structure 140 may be an embodiment including a screw member and a screw hole, the circuit board module is provided with a fixing hole, and the screw member passes through the fixing hole and is screwed with the screw hole to fix the circuit board module; the detachable connection structure 140 may also include a clip and a clip slot, in which the clip passes through the fixing hole of the circuit board module to be clipped with the clip slot to fix the circuit board module.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. A circuit test stand, comprising:

a base body (100), the base body (100) being provided with an inner cavity;

at least one test meter (200), said test meter (200) being disposed in said inner cavity, said base body (100) being provided with a viewing opening (110) communicating with said inner cavity;

the overload protection module (300) is arranged in the inner cavity, and the overload protection module (300) is electrically connected with the detection instrument (200);

and the wiring terminal group (400) is arranged on the base body (100), and the overload protection module (300) is electrically connected with the wiring terminal group (400).

2. A circuit test stand according to claim 1, wherein: overload protection module (300) including all set up comparing element (310), switch element (320) and reference voltage unit (330) in the inner chamber, the first input of comparing element (310) with binding post group (400) electric connection, the second input of comparing element (310) with reference voltage unit (330) electric connection, the output of comparing element (310) with the control end of switch element (320) is connected, binding post group (400) pass through switch element (320) with instrumentation (200) are connected.

3. A circuit test stand according to claim 2, wherein: the comparison unit (310) comprises an operational amplifier U2, a resistor R4 and a resistor R5, one end of the resistor R4 is connected with the wiring terminal group (400), the other end of the resistor R4 is connected with a first input end of the operational amplifier U2 and one end of the resistor R5 respectively, the other end of the resistor R5 is grounded, a second input end of the operational amplifier U2 is connected with the reference voltage unit (330), and an output end of the operational amplifier U2 is connected with a control end of the switch unit (320).

4. A circuit test stand according to claim 2, wherein: the switch unit (320) includes switch tube Q1 and resistance R6, switch tube Q1's input with binding post group (400) are connected, switch tube Q1's output with detecting instrument (200) are connected, switch tube Q1's control end respectively with the output and the resistance R6 of comparing element (310) are connected, the other end ground connection of resistance R6.

5. A circuit test stand according to claim 2, wherein: the detection instrument (200) is provided with a gear adjusting piece (210), and the gear adjusting piece (210) is connected with the reference voltage unit (330) to adjust the output voltage of the reference voltage unit (330).

6. A circuit test bench according to claim 5, wherein: the reference voltage unit (330) comprises a transfer switch (331), a voltage stabilizing chip (332), a resistor R1, a resistor R2 and a resistor R3, and the gear adjusting piece (210) is in transmission connection with the transfer switch (331);

the voltage stabilizing chip (332) is connected with one end of the resistor R1, and the other end of the resistor R1 is respectively connected with a second input end of the comparison unit (310) and a contact of the change-over switch (331);

a first contact of the transfer switch (331) is connected with one end of the resistor R2, and a second contact of the transfer switch (331) is connected with one end of the resistor R3;

the other end of the resistor R2 and the other end of the resistor R3 are grounded.

7. A circuit test stand according to claim 1, wherein: the wiring terminal group (400) comprises at least two wiring terminals (410) and indicator lamps (500) connected with the wiring terminals (410) in a one-to-one correspondence mode, and the indicator lamps (500) are arranged on the base body (100).

8. A circuit test stand according to claim 1, wherein: the power supply device is characterized by further comprising a power supply connecting seat (120) and a power supply terminal group (130), wherein the power supply connecting seat (120) is arranged on the base body (100), the power supply connecting seat (120) can be detachably connected with an external power supply module, and the power supply connecting seat (120) is electrically connected with the power supply terminal group (130).

9. A circuit test stand according to claim 8, wherein: the power supply connecting seat (120) is electrically connected with the power supply terminal group (130) through the fuse (600).

10. A circuit test stand according to claim 1, wherein: the base body (100) is provided with a detachable connecting structure (140) and a bread board (700), and the detachable connecting structure (140) can be detachably connected with an external circuit board module.