CN215678692U - Structure for testing POE power output voltage - Google Patents
Structure for testing POE power output voltage Download PDFInfo
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- CN215678692U CN215678692U CN202122084825.4U CN202122084825U CN215678692U CN 215678692 U CN215678692 U CN 215678692U CN 202122084825 U CN202122084825 U CN 202122084825U CN 215678692 U CN215678692 U CN 215678692U
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Abstract
The utility model provides a structure for testing POE power output voltage, which comprises a positive bus and a negative bus; an input resistor and an output resistor which are bridged between the positive bus and the negative bus; the current grading branch circuit arranged between the input resistor and the output resistor comprises an N-type triode Q3, an N-type switch tube Q2, an N-type switch tube Q1, a shunt resistor, a voltage stabilizing tube ZD2, a voltage stabilizing tube ZD4 and a resistor R17, wherein a positive bus is connected to a c pole of a triode Q3 through the shunt resistor, an e pole of the triode Q3 is connected with a negative bus, the positive bus is sequentially connected in series with the voltage stabilizing tube ZD2, the resistor R17 and the voltage stabilizing tube ZD4 to the negative bus, a g pole of the N-type switch tube Q2 is connected between the resistor R17 and the voltage stabilizing tube ZD4, an s pole and a d pole of the N-type switch tube Q1 are connected in series in the negative bus, and the g pole of the N-type switch tube Q1 is connected between the resistor R17 and the voltage stabilizing tube ZD 4. The POE power supply output voltage testing method and the POE power supply output voltage testing device can test the POE power supply output voltage.
Description
Technical Field
The utility model relates to the technical field of POE power supply output voltage induction, and mainly relates to a structure for testing the POE power supply output voltage.
Background
POE power is more and more popularized on the market, and the producer of POE power often need come induced POE power output voltage with the PD equipment (Powered Device) of outside purchase after producing the POE power, then carries out aging testing according to the voltage of POE power output, and the POE power need test to be accomplished and the performance is qualified just can pack and dispatch from the factory.
The external PD device completes the burn-in test by the following operation method:
firstly, the method comprises the following steps: after a POE power supply is electrified, firstly providing a detection voltage of 4-8V for detecting the characteristic impedance of the PD equipment, wherein the rated range of the characteristic impedance is 17-29.7K omega;
the second step is that: after the POE power supply finishes the characteristic impedance detection, sending out a standard detection voltage of 18V, and detecting the current flowing through the PD equipment;
the third step: the POE power supply sets power distribution according to different collected currents, and limits the power after handshaking is successful;
the fourth step: after the POE power supply completely outputs 54V voltage, the minimum working current is continuously detected, the current is generally greater than 20mA, and whether external electric equipment is connected or not is judged.
The PD equipment purchased from outside needs to use a standard chip, which is generally manufactured in europe and america, and the cost is very expensive, and the custom-made delivery period is also very long, which is not beneficial to the aging test of manufacturers of POE power supplies.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a structure for testing the output voltage of a POE power supply, which can test the output voltage of the POE power supply and has the advantages of low cost and convenient use.
Therefore, a structure for testing the output voltage of the POE power supply is provided, which comprises:
a positive bus and a negative bus;
the input resistor is bridged between the positive bus and the negative bus and is used for adjusting the input impedance of the circuit;
the output resistor is bridged between the positive bus and the negative bus and is used for adjusting the output impedance of the circuit;
the current grading branch circuit arranged between the input resistor and the output resistor comprises an N-type triode Q3, an N-type switch tube Q2, an N-type switch tube Q1, a shunt resistor, a voltage stabilizing tube ZD2, a voltage stabilizing tube ZD4 and a resistor R17, wherein the shunt resistor is a plurality of resistors connected in parallel, a positive bus is connected to a c pole of the triode Q3 through the shunt resistor, an e pole of the triode Q3 is connected with a negative bus, the positive bus is sequentially connected with the voltage stabilizing tube ZD2, the resistor R17 and the voltage stabilizing tube 4 to the negative bus in series, the conduction directions of the voltage stabilizing tube ZD2 and the voltage stabilizing tube ZD4 point to the positive bus, a g pole of the N-type switch tube Q2 is connected between the resistor R17 and the voltage stabilizing tube ZD4, a d pole of the N-type switch tube Q3 is connected with a b pole, an s pole of the triode Q3 is connected with the negative bus, and s poles of the N-type switch tube Q1 are connected in series in the negative bus in series, and the g pole of the N-type switch tube ZD 17 and the voltage stabilizing tube 4.
Further, a resistor R19 is connected between the resistor R17 and the N-type switching tube Q2.
Furthermore, the power supply also comprises an indicator light, wherein the input end of the indicator light is connected with the positive bus, and the output end of the indicator light is connected with the d pole of the N-type switching tube Q1.
Further, a resistor R16 is connected between the input end of the indicator light and the positive bus.
Further, the input resistor comprises a capacitor C1, a resistor R15, a resistor R18 and a resistor R20, and the three resistors are connected in series and then connected in parallel with the capacitor C1 between the positive bus and the negative bus respectively.
Further, the output resistor comprises a plurality of resistors connected in parallel.
According to the structure for testing the output voltage of the POE power supply, the POE power supply can output the voltage by arranging the positive bus, the negative bus, the input resistor, the output resistor and the specific connecting circuit of the current grading branch, the external controller conducts the aging test of the POE power supply by connecting the output end of the power branch, and the structure is low in cost and convenient to use.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a detection circuit for testing the POE power output voltage structure of the present invention.
Detailed Description
The utility model is further described with reference to the following examples.
Referring to fig. 1, in this embodiment, the structure of the POE power output voltage, the positive bus and the negative bus, is tested; the input resistor is bridged between the positive bus and the negative bus and is used for adjusting the input impedance of the circuit; the output resistor is bridged between the positive bus and the negative bus and is used for adjusting the output impedance of the circuit; the current grading branch circuit arranged between the input resistor and the output resistor comprises an N-type triode Q3, an N-type switch tube Q2, an N-type switch tube Q1, a shunt resistor, a voltage regulator tube ZD2, a voltage regulator tube ZD4 and a resistor R17, the shunt resistor is a plurality of resistors connected in parallel, the positive bus is connected to the c pole of the triode Q3 through the shunt resistor, the e pole of the triode Q3 is connected with the negative bus, the positive bus is sequentially connected in series with a voltage regulator tube ZD2, a resistor R17, a voltage regulator tube ZD4 to the negative bus, the conduction directions of the voltage regulator tube ZD2 and the voltage regulator tube ZD4 point to the positive bus, the g pole of the N-type switch tube Q2 is connected between a resistor R17 and a voltage regulator tube ZD4, the d pole of the N-type switch tube Q1 is connected with the b pole of the triode Q3, the s pole of the triode Q3 is connected with the negative bus, the s pole and the d pole of the N-type switch tube Q1 are connected in series in the negative bus, the g pole of the power supply is connected between the resistor R17 and the voltage regulator tube ZD4, so that the POE power supply can output voltage, and the external controller carries out the aging test of the POE power supply by connecting the output end of the power supply branch. This embodiment induces POE power output voltage to perform aging test through the above structure.
The N-type switching tube Q2 can protect the current classification branch, and when the voltage across the current classification branch exceeds a first set value, the N-type switching tube Q2 is turned off to cut off the current loop flowing through the current classification branch.
The current is prevented from flowing into the N-type switch tube Q1 directly from the positive bus, so that the N-type switch tube Q1 is conducted, and the resistor R19 is connected between the resistor R17 and the N-type switch tube Q2.
The input resistor comprises a capacitor C1, a resistor R15, a resistor R18 and a resistor R20, and the three resistors are connected in series and then connected in parallel with the capacitor C1 between the positive bus and the negative bus respectively.
Further, the output resistor comprises a plurality of resistors connected in parallel.
The capacitors connected in parallel to the two ends of the resistor R26 are respectively a capacitor C2, a capacitor C3 and a capacitor C4.
In order to judge whether POE power output voltage, still including the pilot lamp, the positive bus is connected to the input of pilot lamp, and the output connects the d utmost point of connecting N type switch tube Q1. And a resistor R16 is connected between the input end of the indicator light and the positive bus and is used for preventing the indicator light from being broken down by high voltage.
In order to provide characteristic impedance of 25K when the POE power supply outputs 4-8V detection voltage, the impedance branch circuit comprises a capacitor C1, a resistor R15, a resistor R18 and a resistor R20, and the three resistors are connected in series with each other and then connected in parallel with the capacitor C1 between the positive output end and the negative output end of the POE power supply respectively.
In order to prevent the current of the current grading branch from recovering when the output voltage of the POE power supply is from 9V to 54V and exceeds about 22V, the current grading branch is disconnected, and the eight resistors are prevented from being damaged due to overlarge power, the current grading branch comprises a resistor R1, a diode ZD1, a triode Q3 and a plurality of resistors which are mutually connected in parallel between a node A and a node B, the current flowing into the current grading branch is divided into two branches, one branch is connected in parallel to the node A after passing through a resistor R1 and a diode ZD1 which are connected in series, the other branch flows through a B pole of a triode Q3, a c pole of the triode Q3 is connected with the node B, and an e pole of the triode Q3 outputs the grading current. The plurality of resistors are eight resistors R2 to R9.
Provide a minimum operating current that is not less than 20mA for the POE power, let the POE power continuously output, the power branch road includes a plurality of resistances, and each resistance is parallelly connected in the both ends of the hierarchical branch road of electric current respectively. The resistors are respectively a resistor R10 to a resistor R14 and a resistor R21 to a resistor R25.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A test POE power output voltage's structure, its characterized in that includes:
a positive bus and a negative bus;
the input resistor is bridged between the positive bus and the negative bus and is used for adjusting the input impedance of the circuit;
the output resistor is bridged between the positive bus and the negative bus and is used for adjusting the output impedance of the circuit;
the current grading branch circuit arranged between the input resistor and the output resistor comprises an N-type triode Q3, an N-type switch tube Q2, an N-type switch tube Q1, a shunt resistor, a voltage stabilizing tube ZD2, a voltage stabilizing tube ZD4 and a resistor R17, wherein the shunt resistor is a plurality of resistors connected in parallel, a positive bus is connected to a c pole of the triode Q3 through the shunt resistor, an e pole of the triode Q3 is connected with a negative bus, the positive bus is sequentially connected with the voltage stabilizing tube ZD2, the resistor R17 and the voltage stabilizing tube 4 to the negative bus in series, the conduction directions of the voltage stabilizing tube ZD2 and the voltage stabilizing tube ZD4 point to the positive bus, a g pole of the N-type switch tube Q2 is connected between the resistor R17 and the voltage stabilizing tube ZD4, a d pole of the N-type switch tube Q3 is connected with a b pole, an s pole of the triode Q3 is connected with the negative bus, and s poles of the N-type switch tube Q1 are connected in series in the negative bus in series, and the g pole of the N-type switch tube ZD 17 and the voltage stabilizing tube 4.
2. The structure for testing the output voltage of the POE power supply of claim 1, wherein: and a resistor R19 is connected between the resistor R17 and the N-type switch tube Q2.
3. The structure for testing the output voltage of the POE power supply of claim 1, further comprising an indicator light, wherein the input end of the indicator light is connected to the positive bus, and the output end of the indicator light is connected to the d pole of the N-type switching tube Q1.
4. The structure for testing the output voltage of the POE power supply as claimed in claim 3, wherein a resistor R16 is connected between the input terminal of the indicator light and the positive bus.
5. The structure for testing the output voltage of the POE power supply of claim 1, wherein: the input resistor comprises a capacitor C1, a resistor R15, a resistor R18 and a resistor R20, and the three resistors are connected in series and then connected in parallel with the capacitor C1 between the positive bus and the negative bus respectively.
6. The structure for testing the output voltage of the POE power supply of claim 1, wherein: the output resistor comprises a plurality of resistors connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122084825.4U CN215678692U (en) | 2021-08-31 | 2021-08-31 | Structure for testing POE power output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122084825.4U CN215678692U (en) | 2021-08-31 | 2021-08-31 | Structure for testing POE power output voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215678692U true CN215678692U (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122084825.4U Active CN215678692U (en) | 2021-08-31 | 2021-08-31 | Structure for testing POE power output voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215678692U (en) |
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2021
- 2021-08-31 CN CN202122084825.4U patent/CN215678692U/en active Active
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