CN220527888U - POE power supply circuit - Google Patents
POE power supply circuit Download PDFInfo
- Publication number
- CN220527888U CN220527888U CN202321377879.2U CN202321377879U CN220527888U CN 220527888 U CN220527888 U CN 220527888U CN 202321377879 U CN202321377879 U CN 202321377879U CN 220527888 U CN220527888 U CN 220527888U
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- triode
- power supply
- circuit
- voltage division
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- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- Control Of Voltage And Current In General (AREA)
Abstract
The utility model discloses a POE power supply circuit, which comprises a control chip, a first voltage division circuit and a second voltage division circuit, wherein the first voltage division circuit and the second voltage division circuit are connected with a first power supply, the control chip comprises an AD port and a first port, the AD port is connected with the first voltage division circuit and the second voltage division circuit, the other end of the first voltage division circuit is connected with the first port, an interface matched with an inserting device is arranged at the joint of the second voltage division circuit and the first power supply, a first switch element is arranged on the second voltage division circuit, and the other end of the first switch element is connected with the first port; the utility model has higher detection precision.
Description
Technical Field
The utility model particularly relates to a POE power supply circuit.
Background
POE power technology is becoming more and more mature. The existing power supply circuit, as shown in fig. 1, has the defects that the test accuracy is low and corresponding numerical values cannot be accurately calculated in the test process due to the fact that the voltage division ratio of detection and current detection is the same after the insertion equipment is inserted. The plug-in device may be a wireless AP, or a PD, etc.
Disclosure of Invention
The utility model mainly solves the technical problem of providing a POE power supply circuit.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a POE power supply circuit comprises a control chip, a first voltage dividing circuit connected with a first power supply and a second voltage dividing circuit, wherein the control chip comprises an AD port and a first port, the AD port is connected with the first voltage dividing circuit and the second voltage dividing circuit, the other end of the first voltage dividing circuit is connected with the first port, an interface matched with an inserting device is arranged at the joint of the second voltage dividing circuit and the first power supply, a first switch element is arranged on the second voltage dividing circuit, and the other end of the first switch element is connected with the first port.
By adopting the structure, when no insertion equipment is connected, the AD port detects the corresponding voltage division ratio through the first voltage division circuit, so that an initial preset value is obtained, when the insertion equipment is connected, the value detected by the AD port changes, at the moment, the control chip receives a signal to interrupt the first voltage division circuit, controls the second voltage division circuit to be conducted, and carries out current calculation through the second voltage division circuit, so that the accuracy of overall calculation is improved.
The first voltage dividing circuit comprises two triode switch units, and the two triode switch units are matched to form a switch circuit.
The switching circuit is formed by matching the two triodes, so that a better control effect is formed, and the control chip can better form the control effect.
The two triode switch units comprise a first triode and a second triode, wherein the collector electrode of the first triode is connected with a first power supply, the base electrode of the first triode is connected with a first port, and the base electrode of the second triode is connected with the collector electrode of the first triode.
The AD port is high-resistance input.
The first switching element is a MOS tube.
The MOS tube is adopted to better realize the opening and closing effect, so that the use requirement is met.
Drawings
FIG. 1 is a schematic diagram of the prior art;
fig. 2 is a schematic diagram of embodiment 1 of the present utility model.
Detailed Description
Example 1:
referring to fig. 2, a POE power supply circuit includes a control chip, a first voltage dividing circuit connected to a first power supply, and a second voltage dividing circuit.
It should be noted that, in the present embodiment, all the connections are electrical connections, and those skilled in the art should know the corresponding connection manner, so only the electrical connections are represented by the connections in the present embodiment.
The control chip is provided with the AD ports and the first ports, the number of the AD ports can be selected according to actual requirements, in the embodiment, one AD port is matched with one first port, and therefore a detection effect can be achieved. The first port is a conventional port and can output either a high level 1 or a low level 0. In this embodiment, the control chip is a conventional power supply voltage, and the first power supply VCC may supply power through a voltage stabilizing circuit, or may directly supply power to the control chip through an external power supply.
The first voltage dividing circuit comprises two triode switch units, and the two triode switch units are matched to form a switch circuit. The specific circuit is that two triode switch units include first triode Q1 and second triode Q2, and first triode Q1's collecting electrode passes through resistance R3 and is connected with first power VCC, and first triode Q1's collecting electrode still is connected with second triode Q2's base. The base of the first triode Q1 is connected with the first port through a resistor R4. The collector of the second triode Q2 is connected with one end of a resistor R1, and the other end of the resistor R1 is respectively connected with the AD port and one end of the resistor R2. The emitter of the second transistor Q2 is grounded.
The second voltage dividing circuit is provided with a first switching element Q3. The specific circuit is that the first power VCC is connected with one end of an interface matched with the insertion equipment, and the other end of the interface is respectively connected with the other end of the resistor R2 and one end of the resistor R5. The other end of the resistor R5 is connected to the D pole of the first switching element Q3, the G pole of the first switching element Q3 is connected to the first port, and the S pole of the first switching element Q3 is grounded. The first switching element is a MOS transistor. The MOS tube is adopted to better realize the opening and closing effect, so that the use requirement is met.
By adopting the structure, when no insertion equipment is connected, the AD port detects the corresponding voltage division ratio through the first voltage division circuit, so that an initial preset value is obtained, when the insertion equipment is connected, the value detected by the AD port changes, at the moment, the control chip receives a signal to interrupt the first voltage division circuit, controls the second voltage division circuit to be conducted, and carries out current calculation through the second voltage division circuit, so that the accuracy of overall calculation is improved.
When equipment is not accessed, the first port outputs a low-level signal 0, the second triode Q2 is opened at the moment, the first triode Q1 is in a closed state, the first switching element Q3 is also in a closed state, at the moment, due to the fact that the second triode Q2 is opened, the AD port can detect corresponding values according to the voltage division ratio of the resistor R1 and the resistor R2, the ratio of the voltage division ratio can be selected according to actual requirements, and therefore corresponding adjustment is conducted.
When the device is connected, the first port still continues to output the low level signal 0, a certain voltage drop can be generated due to the fact that the device is connected, at the moment, the AD port can detect the connection of the device, whether the device is connected effectively or not can be judged, when the device is invalid, the first port still continues to output the low level signal 0, the first switching element Q3 is in the closed state, and at the moment, power cannot be supplied.
When the device is active, the control chip controls the first port to output the high-level signal 1 after detecting the signal, the first triode Q1 is in an on state, the second triode Q2 is in an off state, and the first switching element Q3 is in an on state, so that the AD port is directly communicated with the resistor R2. The resistor R5 is a resistor for detecting current, and the first power VCC realizes voltage division detection through the resistor R5. The VCC of the other path is directly communicated with the AD port through the resistor R2, and the AD port is in a high-resistance state, so that the resistor R2 is equivalent to an invalid state, and the connection part of the resistor R5 and the device is directly detected by the AD port, so that the 1:1 detection effect is realized, and the accurate detection effect can be realized.
Claims (5)
1. A POE power supply circuit is characterized in that: the control chip comprises an AD port and a first port, wherein the AD port is connected with the first voltage dividing circuit and the second voltage dividing circuit, the other end of the first voltage dividing circuit is connected with the first port, an interface matched with the insertion equipment is arranged at the joint of the second voltage dividing circuit and the first power supply, a first switch element is arranged on the second voltage dividing circuit, and the other end of the first switch element is connected with the first port.
2. A POE power supply circuit as set forth in claim 1 wherein: the first voltage dividing circuit comprises two triode switch units, and the two triode switch units are matched to form a switch circuit.
3. A POE power supply circuit as set forth in claim 2 wherein: the two triode switch units comprise a first triode and a second triode, wherein the collector electrode of the first triode is connected with a first power supply, the base electrode of the first triode is connected with a first port, and the base electrode of the second triode is connected with the collector electrode of the first triode.
4. A POE power supply circuit as set forth in claim 1 wherein: the AD port is a high-impedance state input.
5. A POE power supply circuit as set forth in claim 1 wherein: the first switching element is a MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321377879.2U CN220527888U (en) | 2023-06-01 | 2023-06-01 | POE power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321377879.2U CN220527888U (en) | 2023-06-01 | 2023-06-01 | POE power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220527888U true CN220527888U (en) | 2024-02-23 |
Family
ID=89928650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321377879.2U Active CN220527888U (en) | 2023-06-01 | 2023-06-01 | POE power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220527888U (en) |
-
2023
- 2023-06-01 CN CN202321377879.2U patent/CN220527888U/en active Active
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