CN213364906U - Cable test circuit and cable test device - Google Patents
Cable test circuit and cable test device Download PDFInfo
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- CN213364906U CN213364906U CN202022079816.1U CN202022079816U CN213364906U CN 213364906 U CN213364906 U CN 213364906U CN 202022079816 U CN202022079816 U CN 202022079816U CN 213364906 U CN213364906 U CN 213364906U
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Abstract
The utility model discloses a cable test circuit and cable testing arrangement. Cable test circuit and cable testing arrangement obtain required two kinds of voltages through the step-down module, realize the switching of two kinds of voltages through voltage switching circuit to whether test LED lamp has the effect and protection circuit is effective, easy operation is high-efficient.
Description
Technical Field
The utility model relates to a cable test field especially relates to cable test circuit and cable testing arrangement.
Background
Along with the rapid development of the electronic industry, some electronic equipment's cables such as data line, charging wire all can increase some functions that play the suggestion effect to the user, add the LED lamp for example, indicate the operating condition of user's cable through light. The inside of these cables is provided with a protection circuit, and the protection circuit inside the cables fails, so the protection circuit of the cables needs to be tested.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing cable test circuit and cable testing arrangement for detect the inside protection circuit of the cable that awaits measuring to select bad product fast.
The utility model provides a cable test circuit includes: the voltage reduction module is used for converting voltage input by an external power supply into first direct current voltage and second direct current voltage, and the first direct current voltage is smaller than the second direct current voltage; the first input end inputs the first direct-current voltage output by the voltage reduction module; the second input end inputs the second direct-current voltage output by the voltage reduction module; the output end is used for being connected to an input terminal of a cable to be tested; and a voltage switching circuit connected between the first input terminal, the second input terminal, and the output terminal, configured to switch an output voltage of the output terminal between the first input terminal and the second input terminal.
Specifically, the cable to be tested comprises an LED lamp.
Specifically, the cable test circuit conducts conduction test of the LED lamp on the cable to be tested.
Specifically, the voltage reduction module comprises a voltage reduction control chip.
Specifically, the voltage switching circuit includes: a relay comprising a control device and a switch array, the switch array being connected between the first input, the second input and the output, the control device having a first terminal and a second terminal, the first terminal being connected to the first input, the control device being for controlling the switch array; the transistor is electrically connected between the second end of the control device and a grounding end; and the current-limiting resistor and the voltage change-over switch are electrically connected between the control end and the first input end of the transistor.
In particular, the control device is configured to switch the first input terminal to connect to the output terminal in the presence of a current flowing through the control switch array, and is configured to switch the second input terminal to connect to the output terminal in the absence of a current flowing through the control switch array.
Specifically, the voltage switching circuit further comprises a diode, and the diode is connected in reverse parallel with the relay.
The utility model provides a cable testing arrangement includes: a housing; the cable test circuit is arranged in the shell; the external power supply interface is arranged on the shell and is used for connecting an external power supply; the test interface is arranged on the shell and is configured to be connected with an output terminal of the cable to be tested; an output interface disposed on the housing; and the output terminal test circuit comprises a resistor and an interface end which are used for forming a loop, the interface end is connected with the test interface, and the output terminal test circuit is arranged in the shell.
Specifically, the output interface is connected to the output terminal.
Specifically, the test interface includes a magnet configured to be detachably and magnetically connected to the output terminal of the cable to be tested.
Specifically, the cable testing device further comprises a light shield, and the light shield is arranged on the testing interface in a shielding mode.
Specifically, the cable testing device further comprises a buzzer, and the buzzer is electrically connected with the voltage reduction module.
The utility model discloses a cable test circuit and cable testing arrangement obtains two kinds of required voltages through the step-down module, realizes the switching of two kinds of voltages through the voltage switching circuit to whether test LED lamp is effective and protection circuit is effective. The circuit and the device have simple composition, simple and convenient test operation and high efficiency.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a current trend diagram of a voltage switching circuit according to an embodiment of the present invention;
fig. 2 is another current-flow diagram of the voltage switching circuit in an embodiment of the present invention;
fig. 3 is a flow chart of cable testing according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a cable to be tested in an embodiment of the present invention;
fig. 5 is a schematic view of an internal structure of a cable detection device according to an embodiment of the present invention;
fig. 6 is an external structural schematic diagram of the cable detection device in the embodiment of the present invention.
Description of reference numerals: 1-a shell; 2-external power supply interface; 3-a test interface; 4-an output interface; 5-a magnet; 6-a light shield; 7-a buzzer; 8-the cable to be tested; 81-input terminal; 82-output terminals; 83-LED lamps; a-a voltage reduction module; b-a voltage switching circuit; c-a first input; d1-diode; e-a second input terminal; f-an output end; a K-relay; k1-control device; k2-switch array; q1-transistor; r-current limiting resistor; s-voltage transfer switch; u1-voltage input by external power supply; u2 — first dc voltage; u3 — second dc voltage; o-a first terminal; p-a second end; z-cable testing device.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Meanwhile, it should be understood that in the following description, a "circuit" refers to a conductive loop constituted by at least one component or sub-circuit through electrical or electromagnetic connection. When a component or circuit is referred to as being "connected to" another component or component/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other component or intervening components may be present, and the connection between the components may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that the two be absent intermediate elements.
Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 4, the cable 8 to be tested has an input terminal 81 at one end of the cable 8 to be tested, and an output terminal 82 and an LED lamp 83 at the other end of the cable 8 to be tested. When the cable 8 to be tested is used, the output terminal 82 is connected with the equipment, and the LED lamp 83 is lighted at the same time, so that the user is prompted that the equipment is in a charging state or a data transmission state at present.
In this embodiment, the cable test circuit includes a voltage-reducing module a, a first input terminal C, a second input terminal E, an output terminal F, and a voltage switching circuit B. The output end F is connected to the 2, 19, 39 pins of the input terminal 81 of the cable 8 to be tested, and the 2, 19, 39 pins are power supply pins of the cable 8 to be tested in this embodiment. It should be understood that the output terminal F may also be connected to the power supply pins of other cables. The cable test circuit conducts conduction test of the LED lamp 83 on the cable 8 to be tested. The voltage reduction module A comprises a voltage reduction control chip. As shown in fig. 3, the voltage dropping module a converts a voltage U1 inputted from an external power source into a first dc voltage U2 and a second dc voltage U3. Wherein the first dc voltage U2 is less than the second dc voltage U3.
The voltage switching circuit B shown in fig. 1 is connected between the first input terminal C, the second input terminal E and the output terminal F. The first input terminal C inputs the first DC voltage U2, and the second input terminal E inputs the second DC voltage U3. The voltage switching circuit B is used to switch the output voltage of the output terminal F between the first input terminal C and the second input terminal E.
Specifically, the voltage switching circuit B includes a relay K, a transistor Q1, a current limiting resistor R, and a voltage switching switch S.
More specifically, the relay K includes a control device K1 and a switch array K2, the control device K1 being for controlling the switch array K2. The switch array K2 is connected between the first input terminal C, the second input terminal E and the output terminal F. The control device K1 has a first terminal O connected to the first input terminal C and a second terminal P. The transistor Q1 is connected in series between the second terminal P of the control device K1 and ground. The current limiting resistor R and the voltage switch S are connected in series between the control terminal of the transistor Q1 and the first input terminal C.
In this embodiment, the transistor Q1 is a transistor, which is a semiconductor device for controlling current, and is used as a contactless switch for controlling pull-in of the relay K. The voltage switch S is used for controlling the base current of the triode so as to control the triode to work.
Specifically, as shown in fig. 1, the voltage switch S is closed, the control device K1 has current flowing through it, and the control switch array K2 switches to connect the first input terminal C to the output terminal F. As shown in fig. 2, when the voltage switch S is turned on, no current flows, and the control device K1 controls the switch array K2 to switch the second input terminal to be connected to the output terminal F.
In the embodiment shown in fig. 1 and 2, the switch array K2 is a double-pole double-throw switch, and it should be understood that other control switches, such as a single-pole double-throw switch, may be used.
Thus, the on or off of the voltage switch S triggers the switch array K2 to switch between the first input terminal C and the second input terminal E, so as to switch the voltage output at the output terminal F.
In this embodiment, the voltage switching circuit B further includes a diode D1, and the diode D1 is connected in inverse parallel with the relay K, that is, the cathode of the diode D1 is connected to the first terminal O of the control device K1, and the anode of the diode is connected to the second terminal P of the control device K1. The parallel diode D1 is used for preventing the counter electromotive force generated when the relay K is powered on or off from influencing the circuit or damaging the components.
With reference to fig. 5 and fig. 6, in the present embodiment, the cable testing apparatus Z includes a housing 1, the cable testing circuit as described above, an external power interface 2, a testing interface 3, an output interface 4, and an output terminal testing circuit.
Specifically, the cable test circuit is disposed within the housing 1. The external power supply interface 2 is arranged on the shell 1 and is used for connecting an external power supply. The test interface 3 is provided on the housing 1 and configured to connect the output terminals 82 of the cable 8 to be tested. The output interface 4 is provided on the housing 1 and connected to the output terminal F, and is configured to connect the input terminal 81 of the cable 8 to be tested. The output terminal test circuit is arranged in the shell 1 and comprises a resistor and an interface end which are used for forming a loop, and the interface end is connected with the test interface 3.
In this embodiment, the test interface 3 includes a magnet 5, and the magnet 5 is configured to be detachably and magnetically connected to the output terminal 82 of the cable 8 to be tested, so that the output terminal 82 of the cable 8 to be tested can be quickly connected to the test interface 3.
Referring to fig. 3, a voltage U1 input by the external power source obtains a first dc voltage U2 and a second dc voltage U3 through the voltage dropping module a, and the first dc voltage U2 and the second dc voltage U3 are connected to the voltage switching circuit B. The input terminal 81 of the cable 8 to be tested is connected to the output interface 4, and the output terminal 82 is connected to the test interface 3. The switching of the first dc voltage U2 and the second dc voltage U3 is realized by the voltage switching circuit B, thereby controlling the switching of the LED lamp 83.
Specifically, when the voltage switch S is closed, the first direct current voltage U2 is input to the cable 8 to be tested, so that the LED lamp 83 is turned on. When the voltage switch S is turned on, the second direct current voltage U3 is input to the cable 8 to be tested, the protection circuit in the cable 8 to be tested operates, and the LED lamp 83 is turned off.
The cable testing device Z of the present embodiment further includes a light shield 6 and a buzzer 7. The light shield 6 covers the test interface 3, so that a tester can observe whether the LED lamp 83 is effective or not more easily. Buzzer 7 and step-down module A electric connection, when LED lamp 83 shines, buzzer 7 sends out sound and reminds affirmation.
Therefore, the user can quickly confirm the test result of the cable 8 to be tested through the prompt of the light shield 6 and the buzzer 7, and the test efficiency is improved.
In the present embodiment, the voltage switch S is in the form of a foot switch connected to the outside. The user inserts the input terminal 81 of the cable 8 that awaits measuring behind the output interface 4 of cable testing arrangement Z, and output terminal 82 is connected to test interface 3 through the mating reaction of magnet 5 again, and the user does not step on this moment foot switch, voltage change over switch S are in the on-state, and the cable 8 that awaits measuring is imported to first direct current voltage U2, observes whether LED lamp 83 lights. If the LED lamp is lighted, the user steps on the foot switch again, the voltage change-over switch S is disconnected, the second direct current voltage U3 is input into the cable 8 to be tested, and if the LED lamp is extinguished, the protection circuit works normally.
The utility model discloses a cable test circuit and cable testing arrangement obtains two kinds of required voltages through the step-down module, realizes the switching of two kinds of voltages through the voltage switching circuit to whether test LED lamp is effective and protection circuit is effective. The circuit and the device are simple in composition, the test operation is simple, convenient and efficient, the test result is easy to obtain quickly through the cooperation effect of the light shield and the buzzer, and the efficiency is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (11)
1. A cable test circuit, comprising:
the voltage reduction module (A) is used for converting a voltage (U1) input by an external power supply into a first direct-current voltage (U2) and a second direct-current voltage (U3), and the first direct-current voltage (U2) is smaller than the second direct-current voltage (U3);
a first input terminal (C) for inputting a first DC voltage (U2) output by the voltage reduction module (A);
a second input terminal (E) for inputting a second DC voltage (U3) output by the voltage reduction module (A);
an output terminal (F) for connection to an input terminal (81) of a cable (8) to be tested; and
a voltage switching circuit (B) connected between the first input (C), second input (E) and the output (F) configured to switch an output voltage of the output (F) between the first input (C) and the second input (E).
2. Cable test circuit according to claim 1, characterized in that the cable under test (8) comprises a LED lamp (83);
the cable test circuit conducts conduction test of the LED lamp (83) on the cable (8) to be tested.
3. Cable test circuit according to claim 1, characterized in that the voltage-reducing module (a) comprises a voltage-reducing control chip.
4. Cable test circuit according to claim 1, characterized in that the voltage switching circuit (B) comprises:
a relay (K) comprising a control device (K1) and a switch array (K2), the switch array (K2) being connected between the first input (C), the second input (E) and the output (F), the control device (K1) having a first terminal (O) and a second terminal (P), the first terminal (O) being connected to the first input (C), the control device (K1) being for controlling the switch array (K2);
a transistor (Q1), the transistor (Q1) being electrically connected between the second terminal (P) of the control device (K1) and ground; and
and the current limiting resistor (R) and the voltage switch (S) are electrically connected between the control end of the transistor (Q1) and the first input end (C).
5. Cable test circuit according to claim 4, characterized in that the control device (K1) is configured to switch to connect the first input (C) to the output (F) in the presence of a current flowing through the control switch array (K2) and to switch to connect the second input (E) to the output (F) in the absence of a current flowing through the control switch array (K2).
6. Cable test circuit according to claim 5, characterized in that the voltage switching circuit (B) further comprises a diode (D1), the diode (D1) being connected in anti-parallel with the relay (K).
7. A cable testing device (Z), characterized in that it comprises:
a housing (1);
a cable test circuit according to any one of claims 1-6, arranged within the housing (1);
the external power supply interface (2) is arranged on the shell (1) and is used for connecting an external power supply;
a test interface (3) provided on the housing (1) configured to connect an output terminal (82) of the cable (8) to be tested;
an output interface (4) arranged on the housing (1); and
the output terminal test circuit comprises a resistor and an interface end which are used for forming a loop, the interface end is connected with the test interface (3), and the output terminal test circuit is arranged in the shell (1).
8. Cable testing device (Z) according to claim 7, characterized in that the output interface (4) is connected to the output (F).
9. The cable testing device (Z) according to claim 8, characterized in that the test interface (3) comprises a magnet (5), the magnet (5) being configured to be detachably magnetically connected with the output terminal (82) of the cable (8) to be tested.
10. The cable testing device (Z) according to claim 9, characterized in that it further comprises a light shield (6), which light shield (6) is arranged outside the test interface (3).
11. The cable testing device (Z) according to claim 7, characterized in that it further comprises a buzzer (7), said buzzer (7) being electrically connected to said voltage step-down module (a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022079816.1U CN213364906U (en) | 2020-09-21 | 2020-09-21 | Cable test circuit and cable test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022079816.1U CN213364906U (en) | 2020-09-21 | 2020-09-21 | Cable test circuit and cable test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213364906U true CN213364906U (en) | 2021-06-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022079816.1U Active CN213364906U (en) | 2020-09-21 | 2020-09-21 | Cable test circuit and cable test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213364906U (en) |
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2020
- 2020-09-21 CN CN202022079816.1U patent/CN213364906U/en active Active
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