CN216747870U - AC/DC test pencil with high sensitivity and dynamic internal resistance - Google Patents
AC/DC test pencil with high sensitivity and dynamic internal resistance Download PDFInfo
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- CN216747870U CN216747870U CN202122279367.XU CN202122279367U CN216747870U CN 216747870 U CN216747870 U CN 216747870U CN 202122279367 U CN202122279367 U CN 202122279367U CN 216747870 U CN216747870 U CN 216747870U
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Abstract
The utility model relates to an alternating current-direct current test pencil of high-sensitivity dynamic internal resistance, which comprises two groups of dynamic internal resistance measuring parts, wherein the two groups of dynamic internal resistance measuring parts have the same structure and opposite current directions; one group of dynamic internal resistance measuring components comprise diodes, a plurality of triodes, a plurality of resistors and light emitting diodes. The LED can simultaneously detect the anode and the cathode of a direct current power supply and an alternating current power supply, when the current is small, the LED can be brighter than the existing LED, and when the current is large, the LED has certain protection due to the protection of a resistor.
Description
Technical Field
The utility model belongs to the field of ammeter detection, and particularly relates to a high-sensitivity alternating current-direct current test pencil with dynamic internal resistance.
Background
In the field of power grids, test pens are often used for measuring voltages and the like, however, the internal structural design of the existing test pen is unreasonable, when the resistance is large, a light-emitting diode emits light weakly, when the resistance is small, the light-emitting diode emits light suddenly, observation is not facilitated, and the light-emitting diode is also not protected.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a high-sensitivity dynamic internal resistance alternating current and direct current test pencil which can simultaneously detect the positive electrode and the negative electrode of a direct current power supply and an alternating current power supply, when the current is small, a light emitting diode can be brighter than the existing light emitting diode, and when the current is large, the light emitting diode has certain protection due to the protection of a resistor.
The technical scheme of the utility model is as follows:
a high-sensitivity alternating current-direct current test pencil for dynamic internal resistance comprises two groups of dynamic internal resistance measuring components, wherein the two groups of dynamic internal resistance measuring components have the same structure and opposite current directions;
the dynamic internal resistance measuring component comprises a diode, a plurality of triodes, a plurality of resistors and a light-emitting diode, wherein the anode of the diode is connected with the anode of a power supply, the cathode of the diode is respectively connected with one ends of a first resistor and a second resistor, the other end of the first resistor is connected with one end of a third resistor and the C pole of the first triode, the other end of the second resistor is connected with the anode of the light-emitting diode, the cathode of the light-emitting diode is connected with the C pole of the second triode, the B pole of the second triode is connected with the other end of the third resistor, the E pole of the second triode is connected with the B pole of the first triode and one end of a fourth resistor, and the E pole of the first triode is connected with the other end of the fourth resistor, a detecting end and the anode of the diode of the other dynamic internal resistance measuring component.
Furthermore, the other group of dynamic internal resistance measuring components comprise a diode, a plurality of triodes, a plurality of resistors and a light emitting diode; the negative electrode of the diode is respectively connected with one end of a first resistor and one end of a second resistor, the other end of the first resistor is connected with one end of a third resistor and the C electrode of the first triode, the other end of the second resistor is connected with the positive electrode of the light-emitting diode, the negative electrode of the light-emitting diode is connected with the C electrode of the second triode, the B electrode of the second triode is connected with the other end of the third resistor, the E electrode of the second triode is connected with the B electrode of the first triode and one end of a fourth resistor, and the E electrode of the first triode is connected with the other end of the fourth resistor, the negative electrode of the power supply and the diode positive electrode of the first dynamic internal resistance measuring component.
Furthermore, the triodes are all NPN triodes.
Furthermore, one of the light emitting diodes is red, and the other light emitting diode is blue.
Furthermore, the test pencil is used for measuring the anode and the cathode of the direct current power supply and the alternating current power supply.
Compared with the prior art, the utility model has the following beneficial effects:
the structure of the dynamic internal resistance measuring component is reasonably arranged, two groups of dynamic internal resistance measuring components with opposite current directions are arranged, the internal resistance is dynamically adjusted through the conduction of the triode, and the current trend is reasonably planned through the series-parallel connection of the internal resistance, so that the LED can simultaneously detect the anode and the cathode of the direct current power supply and the alternating current power supply, when the current is small, the LED can be brighter than the existing LED, and when the current is large, the LED has certain protection due to the protection of the resistance.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples without making any creative effort, shall fall within the protection scope of the present application.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "upper," "lower," "left," "right," "transverse," and "vertical" are used merely for purposes of orientation relative to the elements in the drawings, and these directional terms are relative terms, which are used for descriptive and clarifying purposes and which can vary accordingly depending upon the orientation in which the elements in the drawings are placed.
As shown in fig. 1, the ac/dc test pencil with high sensitivity and dynamic internal resistance of the present embodiment includes two sets of dynamic internal resistance measurement components, where the two sets of dynamic internal resistance measurement components have the same structure and opposite current directions.
One group of dynamic internal resistance measuring components comprise diodes, a plurality of triodes, a plurality of resistors and light emitting diodes. The anode D21 of the diode is connected to the anode of the power source S, the cathode of the diode D21 is connected to one ends of the first resistor R21 and the second resistor R22, the other end of the first resistor R21 is connected to one end of the third resistor R23 and the C-pole of the first triode T21, the other end of the second resistor R22 is connected to the anode of the light emitting diode, the cathode of the light emitting diode is connected to the C-pole of the second triode T22, the B-pole of the second triode T22 is connected to the other end of the third resistor R23, the E-pole of the second triode T22 is connected to the B-pole of the first triode T21 and one end of the fourth resistor R24, and the E-pole of the first triode T21 is connected to the other end of the fourth resistor R24, the detection end P, and the anode D11 of the other group of dynamic internal resistance measurement components.
The other group of dynamic internal resistance measuring components comprise diodes, a plurality of triodes, a plurality of resistors and light emitting diodes. The diode cathode D11 is respectively connected with one end of a first resistor R11 and one end of a second resistor R12, the other end of the first resistor R11 is connected with one end of a third resistor R13 and the C pole of a first triode T11, the other end of the second resistor R12 is connected with the anode of a light emitting diode, the cathode of the light emitting diode is connected with the C pole of a second triode T12, the B pole of the second triode T12 is connected with the other end of a third resistor R13, the E pole of the second triode R13 is connected with the B pole of a first triode T11 and one end of a fourth resistor R14, and the E pole of the first triode T11 is connected with the other end of a fourth resistor R14, the cathode of a power supply S and the diode anode D22 of the first dynamic internal resistance measuring component.
In this embodiment, the transistors are all NPN transistors. One of the light emitting diodes is red and the other light emitting diode is blue. The test pencil is used for measuring the anode and the cathode of the direct current power supply and the alternating current power supply. The resistance value of the resistor can be determined according to the measurement requirement.
The working process of the embodiment is as follows:
taking the positive electrode of the detection direct current as an example, when the current is small, the current passes through the diode D21, then passes through the resistor R21, the resistor R22, the resistor R23, the triode T22 and the resistor R24 to reach the detection end, and the overall resistance is large; when the electric current is great, triode T21 switches on, and the electric current still passes through triode T21, and triode T21 becomes dynamic internal resistance promptly, makes the whole can hinder lessly, thereby, the test pencil of this embodiment, can hinder big when voltage is high, can hinder little when voltage is low, the lamp is also brighter when measuring low-voltage, the electric current also can not be very much (increase very fast) when measuring high voltage, thereby protection emitting diode, in this embodiment, to 300V's voltage, the electric current is about 20 microamperes.
The light emitting diode is brighter no matter under a small current or a large current.
When the positive pole of the direct current is detected, one of the light emitting diodes is bright, and when the negative pole of the direct current is detected, the other light emitting diode is bright. When measuring the alternating current, the two light-emitting diodes are both bright.
Claims (5)
1. The utility model provides a high sensitive developments internal resistance's alternating current-direct current test pencil which characterized in that: the device comprises two groups of dynamic internal resistance measuring components, wherein the two groups of dynamic internal resistance measuring components have the same structure and opposite current directions;
the dynamic internal resistance measuring component comprises a diode, a plurality of triodes, a plurality of resistors and a light-emitting diode, wherein the anode of the diode is connected with the anode of a power supply, the cathode of the diode is respectively connected with one ends of a first resistor and a second resistor, the other end of the first resistor is connected with one end of a third resistor and the C pole of the first triode, the other end of the second resistor is connected with the anode of the light-emitting diode, the cathode of the light-emitting diode is connected with the C pole of the second triode, the B pole of the second triode is connected with the other end of the third resistor, the E pole of the second triode is connected with the B pole of the first triode and one end of a fourth resistor, and the E pole of the first triode is connected with the other end of the fourth resistor, a detecting end and the anode of the diode of the other dynamic internal resistance measuring component.
2. The ac/dc test pencil of claim 1, wherein: the other group of dynamic internal resistance measuring components comprise diodes, a plurality of triodes, a plurality of resistors and light emitting diodes; the negative electrode of the diode is respectively connected with one end of a first resistor and one end of a second resistor, the other end of the first resistor is connected with one end of a third resistor and the C electrode of the first triode, the other end of the second resistor is connected with the positive electrode of the light-emitting diode, the negative electrode of the light-emitting diode is connected with the C electrode of the second triode, the B electrode of the second triode is connected with the other end of the third resistor, the E electrode of the second triode is connected with the B electrode of the first triode and one end of a fourth resistor, and the E electrode of the first triode is connected with the other end of the fourth resistor, the negative electrode of the power supply and the diode positive electrode of the first dynamic internal resistance measuring component.
3. The ac/dc test pencil of claim 1 or 2, wherein: the triode is an NPN triode.
4. The ac/dc test pencil of claim 1 or 2, wherein: one of the light emitting diodes is red and the other light emitting diode is blue.
5. The ac/dc test pencil of claim 1 or 2, wherein: the test pencil is used for measuring the anode and the cathode of the direct current power supply and the alternating current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122279367.XU CN216747870U (en) | 2021-09-18 | 2021-09-18 | AC/DC test pencil with high sensitivity and dynamic internal resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122279367.XU CN216747870U (en) | 2021-09-18 | 2021-09-18 | AC/DC test pencil with high sensitivity and dynamic internal resistance |
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| Publication Number | Publication Date |
|---|---|
| CN216747870U true CN216747870U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122279367.XU Active CN216747870U (en) | 2021-09-18 | 2021-09-18 | AC/DC test pencil with high sensitivity and dynamic internal resistance |
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| Country | Link |
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| CN (1) | CN216747870U (en) |
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2021
- 2021-09-18 CN CN202122279367.XU patent/CN216747870U/en active Active
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