CN210895423U - Test system for host interface - Google Patents
Test system for host interface Download PDFInfo
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- CN210895423U CN210895423U CN202020143011.6U CN202020143011U CN210895423U CN 210895423 U CN210895423 U CN 210895423U CN 202020143011 U CN202020143011 U CN 202020143011U CN 210895423 U CN210895423 U CN 210895423U
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Abstract
The utility model relates to a computer detection device technical field, its aim at provides a test system for host computer interface. The utility model is electrically connected with a power module, and the test system for the host interface comprises a voltage reference source circuit, a resistance voltage-dividing network, a voltage-dividing circuit, a threshold comparator and an indicator light; the input end of the voltage reference source circuit is electrically connected with the power supply module, and the output end of the voltage reference source circuit is grounded through the resistance voltage division network and the voltage division circuit respectively; a plurality of test plugs are led out of the resistance voltage division network, the midpoint of the resistance voltage division network is electrically connected with one input end of the threshold comparator, and the output end of the voltage division circuit is electrically connected with the other input end of the threshold comparator; the anode of the indicator light is electrically connected with the output end of the threshold comparator, the anode of the indicator light and the power supply input end of the threshold comparator are both electrically connected with the power supply module, and the cathode of the indicator light and the power supply output end of the threshold comparator are both grounded. The utility model discloses efficiency of software testing to the host computer interface is high.
Description
Technical Field
The utility model relates to a computer detection device technical field especially relates to a test system for host computer interface.
Background
A host interface refers to an interface where a processor is accessed as a slave by other processors as masters. The processor can conveniently receive the control information downloaded by the main control equipment and the uploading processing result through the host interface, so that the internal data of the processor can be accessed through the host interface.
In the prior art, the circuit structure of the host interface is complex, the circuit connection points are numerous, the problems of assembly errors and the like are easy to occur in the production process, and in order to ensure that the host interface is normal, the host interface needs to be tested by utilizing test equipment. However, the conventional detection device is a multimeter, and the multimeter is used for measuring the on-off of a circuit during testing, so that the time consumption is too long, and the testing efficiency is low. Therefore, there is a need to develop a test apparatus that can quickly detect the quality of the entire host interface circuit.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned problem that prior art exists, the utility model provides a test system for host computer interface.
The utility model adopts the technical proposal that:
a test system for a host interface is electrically connected with a power supply module and comprises a voltage reference source circuit, a resistance voltage division network, a voltage division circuit, a threshold comparator and an indicator light; the input end of the voltage reference source circuit is electrically connected with the power supply module, and the output end of the voltage reference source circuit is grounded through the resistance voltage division network and the voltage division circuit respectively; a plurality of test plugs are led out of the resistance voltage division network, the midpoint of the resistance voltage division network is electrically connected with one input end of the threshold comparator, and the output end of the voltage division circuit is electrically connected with the other input end of the threshold comparator; the anode of the indicator light is electrically connected with the output end of the threshold comparator, the anode of the indicator light and the power input end of the threshold comparator are both electrically connected with the power module, and the cathode of the indicator light and the power output end of the threshold comparator are both grounded.
Preferably, the threshold comparator comprises an upper threshold comparator and a lower threshold comparator, and the voltage dividing circuit is provided with a high-voltage output end and a low-voltage output end in cooperation with the upper threshold comparator and the lower threshold comparator; the middle point of the resistance voltage division network is respectively and electrically connected with the inverting input end of the upper threshold comparator and the non-inverting input end of the lower threshold comparator, the high-voltage output end of the voltage division circuit is electrically connected with the non-inverting input end of the upper threshold comparator, and the low-voltage output end of the voltage division circuit is electrically connected with the inverting input end of the lower threshold comparator; and the output ends of the upper threshold comparator and the lower threshold comparator are electrically connected with the anode of the indicator light.
Preferably, the voltage reference source circuits are provided with two voltage reference source circuits, and the two voltage reference source circuits are divided into a first voltage reference source circuit and a second voltage reference source circuit; the input end of the first voltage reference source circuit and the input end of the second voltage reference source circuit are both electrically connected with the power supply module, the output end of the first voltage reference source circuit is grounded through a resistor voltage division network, and the output end of the second voltage reference source circuit is grounded through a voltage division circuit.
Further preferably, the resistance voltage-dividing network includes a first resistance, a second resistance, a third resistance, a fourth resistance, a fifth resistance and a sixth resistance; one end of the first resistor is electrically connected with the first voltage reference source circuit, and the other end of the first resistor is grounded through a fifth resistor, a second resistor, a third resistor, a sixth resistor and a fourth resistor in sequence; the combination point of the second resistor and the third resistor is electrically connected with one input end of the threshold comparator; test plugs are led out between the first resistor and the first voltage reference source circuit, between the first resistor and the fifth resistor, between the fifth resistor and the second resistor, between the second resistor and the threshold comparator, between the threshold comparator and the third resistor, between the third resistor and the sixth resistor, between the sixth resistor and the fourth resistor, and between the fourth resistor and the ground electrode.
Preferably, the voltage reference source circuit comprises a controllable precision voltage-stabilizing source, a first voltage-dividing resistor and a second voltage-dividing resistor; the cathode of the controllable precise voltage-stabilizing source is electrically connected with the anode of the controllable precise voltage-stabilizing source sequentially through the first voltage-dividing resistor and the second voltage-dividing resistor, the reference electrode of the controllable precise voltage-stabilizing source is electrically connected with the joint of the first voltage-dividing resistor and the second voltage-dividing resistor, the anode of the controllable precise voltage-stabilizing source is grounded, the cathode of the controllable precise voltage-stabilizing source is electrically connected with the power module, and the cathode of the controllable precise voltage-stabilizing source is the output end of the voltage reference source circuit.
Further preferably, the voltage reference source circuit further comprises a capacitor, one end of the capacitor is electrically connected with the anode of the controllable precise voltage-stabilizing source, and the other end of the capacitor is electrically connected with the cathode of the controllable precise voltage-stabilizing source.
Further preferably, the voltage reference source circuit further comprises a first current limiting resistor, and the controllable precise voltage regulator is electrically connected with the power module through the first current limiting resistor.
Preferably, the test system for the host interface further comprises a second current limiting resistor, and the anode of the indicator light is electrically connected with the power supply module through the current limiting resistor.
The beneficial effects of the utility model are that concentrated the appearance, it is high to the efficiency of software testing of host computer interface. Particularly, the utility model discloses in the use, at first, be connected test plug and the host interface electricity on the circuit board of being tested, power module continuously provides electric support to voltage reference source circuit, threshold comparator and pilot lamp; the voltage reference source circuit provides reference voltage for the resistance voltage division network and the voltage division circuit, one input end of the threshold comparator introduces the reference voltage from the voltage division circuit, the midpoint voltage of the resistance voltage division network flows into the other input end of the threshold comparator, and the threshold comparator compares the reference voltage with the midpoint voltage of the resistance voltage division network; when the host interfaces on the tested circuit board are all normal, the midpoint voltage of the resistance voltage division network is within the opening range of the threshold comparator, at the moment, the threshold comparator outputs high level, the indicator light is lightened, and the host interfaces are indicated to be normal; when the host interface and the connecting cable on the tested circuit board have faults of short circuit, open circuit and the like, the midpoint voltage of the resistance voltage division network deviates from the preset voltage, at the moment, the threshold comparator is closed and outputs low level, the indicator lamp is turned off, and the host interface is indicated to be abnormal. Therefore, the user can master the assembly condition of the host interface by checking the indicator lamp, and simultaneously, the plurality of test plugs are respectively connected with the host interface to be detected, so that the test work can be completed, and the test efficiency is high.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that specific details are provided in the following description to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.
Example (b):
the embodiment provides a test system for a host interface, which is electrically connected to a power module, as shown in fig. 1, the test system for the host interface includes a voltage reference source circuit, a resistance voltage division network, a voltage division circuit, a threshold comparator and an indicator light LED; the input end of the voltage reference source circuit is electrically connected with the power supply module, the output end of the voltage reference source circuit is grounded through the resistance voltage division network and the voltage division circuit respectively, namely one pole of the resistance voltage division network and one pole of the voltage division circuit are both electrically connected with the output end of the voltage reference source circuit, the other pole of the resistance voltage division network and the other pole of the voltage division circuit are both grounded, and the voltage reference source circuit can respectively provide 5V reference voltage for the resistance voltage division network and the voltage division circuit; a plurality of test plugs are led out of the resistance voltage division network, the test plugs are special test plugs and are matched with a host interface on a tested circuit board, the midpoint of the resistance voltage division network is electrically connected with one input end of the threshold comparator, and the output end of the voltage division circuit is electrically connected with the other input end of the threshold comparator; the anode of the indicator light LED is electrically connected with the output end of the threshold comparator, the anode of the indicator light LED and the power input end of the threshold comparator are both electrically connected with the power module, and the cathode of the indicator light LED and the power output end of the threshold comparator are both grounded.
The working principle of the embodiment is as follows: firstly, a test plug is electrically connected with a host interface on a tested circuit board, and a power supply module continuously provides power support for a voltage reference source circuit, a threshold comparator and an indicator light LED; the voltage reference source circuit provides reference voltage for the resistance voltage division network and the voltage division circuit, one input end of the threshold comparator introduces the reference voltage from the voltage division circuit, the midpoint voltage of the resistance voltage division network flows into the other input end of the threshold comparator, and the threshold comparator compares the reference voltage with the midpoint voltage of the resistance voltage division network; when the host interfaces on the tested circuit board are all normal, the midpoint voltage of the resistance voltage division network is within the opening range of the threshold comparator, at the moment, the threshold comparator outputs high level, the indicator light LED is lightened, and the host interfaces are indicated to be normal; when the host interface and the connecting cable on the tested circuit board have faults of short circuit, open circuit and the like, the midpoint voltage of the resistance voltage division network deviates from the preset voltage, the threshold comparator is closed and outputs low level, and the indicator light LED is turned off to indicate that the host interface is abnormal. Therefore, the user can master the assembly condition of the host interface by checking the indicator light LED, and simultaneously, the plurality of test plugs are respectively connected with the host interface to be detected, so that the test work can be completed, and the test efficiency is high.
In this embodiment, the threshold comparator includes an upper threshold comparator IC1 and a lower threshold comparator IC2, and the voltage dividing circuit is matched with the upper threshold comparator IC1 and the lower threshold comparator IC2 to be provided with a high-voltage output end and a low-voltage output end; the middle point of the resistor voltage division network is respectively electrically connected with the inverting input end of the upper threshold comparator IC1 and the non-inverting input end of the lower threshold comparator IC2, the high-voltage output end of the voltage division circuit is electrically connected with the non-inverting input end of the upper threshold comparator IC1, and the low-voltage output end of the voltage division circuit is electrically connected with the inverting input end of the lower threshold comparator IC 2; the output terminals of the upper threshold comparator IC1 and the lower threshold comparator IC2 are electrically connected with the anode of the indicator LED.
In order to avoid the problem of mutual interference between the resistance voltage-dividing network and the threshold comparator, in the embodiment, two voltage reference source circuits are arranged, and the two voltage reference source circuits are divided into a first voltage reference source circuit and a second voltage reference source circuit; the input end of the first voltage reference source circuit and the input end of the second voltage reference source circuit are both electrically connected with the power supply module, the output end of the first voltage reference source circuit is grounded through a resistor voltage division network, and the output end of the second voltage reference source circuit is grounded through a voltage division circuit.
In this embodiment, the voltage divider circuit includes a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15, one end of the thirteenth resistor R13 is electrically connected to the second reference source voltage, the other end of the thirteenth resistor R13 is grounded through a fourteenth resistor R14 and a fifteenth resistor R15 in sequence, a junction point of the thirteenth resistor R13 and the fourteenth resistor R14 is a low-voltage output terminal and outputs a voltage of 2.4V, and a junction point of the fourteenth resistor R14 and the fifteenth resistor R15 is a high-voltage output terminal and outputs a voltage of 2.6V.
In this embodiment, the resistor voltage divider network includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; one end of the first resistor R1 is electrically connected with the first voltage reference source circuit, and the other end of the first resistor R1 is grounded through a fifth resistor R5, a second resistor R2, a third resistor R3, a sixth resistor R6 and a fourth resistor R4 in sequence; a junction point of the second resistor R2 and the third resistor R3 is electrically connected to an input terminal of the threshold comparator, specifically, in this embodiment, a junction point of the second resistor R2 and the third resistor R3 is electrically connected to an inverting input terminal of the upper threshold comparator IC1 and a non-inverting input terminal of the lower threshold comparator IC2, respectively; test plugs are led out between the first resistor R1 and the first voltage reference source circuit, between the first resistor R1 and the fifth resistor R5, between the fifth resistor R5 and the second resistor R2, between the second resistor R2 and the threshold comparator, between the threshold comparator and the third resistor R3, between the third resistor R3 and the sixth resistor R6, between the sixth resistor R6 and the fourth resistor R4, and between the fourth resistor R4 and the ground electrode. In this embodiment, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are equal and are all 1000 Ω.
In this embodiment, the voltage reference source circuit includes a controllable precision voltage regulator, a first voltage dividing resistor and a second voltage dividing resistor; the cathode of the controllable precise voltage-stabilizing source is electrically connected with the anode of the controllable precise voltage-stabilizing source through the first voltage-dividing resistor and the second voltage-dividing resistor in sequence, the reference electrode of the controllable precise voltage-stabilizing source is electrically connected with the joint point of the first voltage-dividing resistor and the second voltage-dividing resistor, the anode of the controllable precise voltage-stabilizing source is grounded, the cathode of the controllable precise voltage-stabilizing source is electrically connected with the power module, and the cathode of the controllable precise voltage-stabilizing source is the output end of the voltage reference source circuit.
Furthermore, the voltage reference source circuit also comprises a capacitor, one end of the capacitor is electrically connected with the anode of the controllable precise voltage-stabilizing source, and the other end of the capacitor is electrically connected with the cathode of the controllable precise voltage-stabilizing source. It should be noted that, the control precision voltage regulator can generate zener noise during the working process, and the capacitor can absorb the zener noise generated by the control precision voltage regulator, so as to improve the output characteristic of the voltage reference source circuit.
Furthermore, the voltage reference source circuit also comprises a first current-limiting resistor, and the controllable precise voltage-stabilizing source is electrically connected with the power supply module through the first current-limiting resistor.
It should be noted that, if a short-circuit fault occurs at the host interface on the circuit board to be tested, the first current-limiting resistor can limit the short-circuit current to 68mA, so as to prevent the embodiment from burning the tested component and the components in the embodiment; if the host interface on the tested circuit board is normal, the supply current output by the voltage reference source circuit is about 1mA, and the working current of the controllable precise voltage-stabilizing source is about 44 mA; if the host interface on the tested circuit board is in an open circuit state, the working current of the controllable precise voltage-stabilizing source is about 45mA and is within 100mA of the rated current, and the controllable precise voltage-stabilizing source cannot be damaged.
Specifically, taking the first voltage reference source circuit as an example, the first voltage reference source circuit includes a controllable precision voltage regulator D1, a first voltage dividing resistor R8, a second voltage dividing resistor R9, a capacitor C1, and a first current limiting resistor R7; the cathode of the controllable precise voltage-stabilizing source D1 is electrically connected with the anode of the controllable precise voltage-stabilizing source D1 through a first voltage-dividing resistor R8 and a second voltage-dividing resistor R9 in sequence, the reference pole of the controllable precise voltage-stabilizing source D1 is electrically connected with the joint point of a first voltage-dividing resistor R8 and a second voltage-dividing resistor R9, the anode of the controllable precise voltage-stabilizing source D1 is grounded, the cathode of the controllable precise voltage-stabilizing source D1 is electrically connected with the power module, the cathode of the controllable precise voltage-stabilizing source D1 is the output end of the voltage reference source circuit, and the controllable precise voltage-stabilizing source D1 is electrically connected with the power module through a first current-limiting resistor R7; one end of the capacitor C1 is electrically connected with the anode of the controllable precise voltage-stabilizing source D1, and the other end of the capacitor C1 is electrically connected with the cathode of the controllable precise voltage-stabilizing source D1.
In this embodiment, the test system for the host interface further includes a second current limiting resistor R16, and an anode of the indicator light LED is electrically connected to the power supply module through the current limiting resistor. It should be appreciated that the second current limiting resistor R16 functions to protect the indicator LED.
The various embodiments described above are merely illustrative, and may or may not be physically separate, as they relate to elements illustrated as separate components; if reference is made to a component displayed as a unit, it may or may not be a physical unit, and may be located in one place or distributed over a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. Such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Finally, it should be noted that the present invention is not limited to the above-mentioned alternative embodiments, and that various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the following claims, and which can be used to interpret the claims.
Claims (8)
1. The utility model provides a test system for host computer interface, is connected with power module electricity which characterized in that: the test system for the host interface comprises a voltage reference source circuit, a resistance voltage division network, a voltage division circuit, a threshold comparator and an indicator light; the input end of the voltage reference source circuit is electrically connected with the power supply module, and the output end of the voltage reference source circuit is grounded through the resistance voltage division network and the voltage division circuit respectively; a plurality of test plugs are led out of the resistance voltage division network, the midpoint of the resistance voltage division network is electrically connected with one input end of the threshold comparator, and the output end of the voltage division circuit is electrically connected with the other input end of the threshold comparator; the anode of the indicator light is electrically connected with the output end of the threshold comparator, the anode of the indicator light and the power input end of the threshold comparator are both electrically connected with the power module, and the cathode of the indicator light and the power output end of the threshold comparator are both grounded.
2. The test system for a host interface of claim 1, wherein: the threshold comparator comprises an upper threshold comparator and a lower threshold comparator, and the voltage division circuit is matched with the upper threshold comparator and the lower threshold comparator and is provided with a high-voltage output end and a low-voltage output end; the middle point of the resistance voltage division network is respectively and electrically connected with the inverting input end of the upper threshold comparator and the non-inverting input end of the lower threshold comparator, the high-voltage output end of the voltage division circuit is electrically connected with the non-inverting input end of the upper threshold comparator, and the low-voltage output end of the voltage division circuit is electrically connected with the inverting input end of the lower threshold comparator; and the output ends of the upper threshold comparator and the lower threshold comparator are electrically connected with the anode of the indicator light.
3. The test system for a host interface of claim 1, wherein: the two voltage reference source circuits are divided into a first voltage reference source circuit and a second voltage reference source circuit; the input end of the first voltage reference source circuit and the input end of the second voltage reference source circuit are both electrically connected with the power supply module, the output end of the first voltage reference source circuit is grounded through a resistor voltage division network, and the output end of the second voltage reference source circuit is grounded through a voltage division circuit.
4. The test system for a host interface of claim 3, wherein: the resistance voltage division network comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; one end of the first resistor is electrically connected with the first voltage reference source circuit, and the other end of the first resistor is grounded through a fifth resistor, a second resistor, a third resistor, a sixth resistor and a fourth resistor in sequence; the combination point of the second resistor and the third resistor is electrically connected with one input end of the threshold comparator; test plugs are led out between the first resistor and the first voltage reference source circuit, between the first resistor and the fifth resistor, between the fifth resistor and the second resistor, between the second resistor and the threshold comparator, between the threshold comparator and the third resistor, between the third resistor and the sixth resistor, between the sixth resistor and the fourth resistor, and between the fourth resistor and the ground electrode.
5. The test system for a host interface according to any one of claims 1 to 4, wherein: the voltage reference source circuit comprises a controllable precise voltage stabilizing source, a first voltage dividing resistor and a second voltage dividing resistor; the cathode of the controllable precise voltage-stabilizing source is electrically connected with the anode of the controllable precise voltage-stabilizing source sequentially through the first voltage-dividing resistor and the second voltage-dividing resistor, the reference electrode of the controllable precise voltage-stabilizing source is electrically connected with the joint of the first voltage-dividing resistor and the second voltage-dividing resistor, the anode of the controllable precise voltage-stabilizing source is grounded, the cathode of the controllable precise voltage-stabilizing source is electrically connected with the power module, and the cathode of the controllable precise voltage-stabilizing source is the output end of the voltage reference source circuit.
6. The test system for a host interface of claim 5, wherein: the voltage reference source circuit further comprises a capacitor, one end of the capacitor is electrically connected with the anode of the controllable precise voltage stabilizing source, and the other end of the capacitor is electrically connected with the cathode of the controllable precise voltage stabilizing source.
7. The test system for a host interface of claim 5, wherein: the voltage reference source circuit further comprises a first current-limiting resistor, and the controllable precise voltage-stabilizing source is electrically connected with the power supply module through the first current-limiting resistor.
8. The test system for a host interface of claim 1, wherein: the test system for the host interface further comprises a second current-limiting resistor, and the anode of the indicator light is electrically connected with the power supply module through the current-limiting resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020143011.6U CN210895423U (en) | 2020-01-21 | 2020-01-21 | Test system for host interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020143011.6U CN210895423U (en) | 2020-01-21 | 2020-01-21 | Test system for host interface |
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| Publication Number | Publication Date |
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| CN210895423U true CN210895423U (en) | 2020-06-30 |
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| CN202020143011.6U Active CN210895423U (en) | 2020-01-21 | 2020-01-21 | Test system for host interface |
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| CN (1) | CN210895423U (en) |
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