CN208862853U - A kind of PoE interchanger of non-standard power supply - Google Patents
A kind of PoE interchanger of non-standard power supply Download PDFInfo
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- CN208862853U CN208862853U CN201821768706.2U CN201821768706U CN208862853U CN 208862853 U CN208862853 U CN 208862853U CN 201821768706 U CN201821768706 U CN 201821768706U CN 208862853 U CN208862853 U CN 208862853U
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Abstract
The utility model relates to PoE technical fields, refer in particular to a kind of PoE interchanger of non-standard power supply, it includes power supply change-over device and power supply unit PSE and power supply unit PSE, power supply unit PSE includes exchanger chip, power switch unit and MCU microcontroller U11, power switch unit includes NMOS tube Q2, switching tube Q1 and network interface output negative pole PORT_NEG, network interface output negative pole PORT_NEG is connected between direct-flow positive pole end VMAIN and direct current negative pole end DGND, and MCU microcontroller U11 is used for the conducting and closing of control switch pipe Q1.The utility model is by power supply change-over device instead of adding standard inverters in PoE interchanger in the prior art, its volume and manufacturing cost for reducing PoE interchanger, power supply by power switch Unit selection to powered device PD, it avoids when powered device PD damage or short circuit, human electric shock is caused to endanger.
Description
Technical field
The utility model relates to PoE technical fields, refer in particular to a kind of PoE interchanger of non-standard power supply.
Background technique
PoE interchanger is while based on to IP terminal transmission data, to transmit direct current pair in standard too net twisted pair
The interchanger of IP terminal data power supply, and two kinds of equipment of PoE technical definition: PoE power supply unit PSE and PoE power receiving equipment
PD carries out data transmission to power receiving equipment and provides direct current by the realization of PoE power supply unit, and standard too net twisted pair is all abided by
Follow IEEE802.3AF standard or the standard of IEEE802.3AT；
IEEE802.3AF allows two kinds of connections, and one is set by idle foot (4 in Fig. 1,5,7,8 pins) to by electricity
Standby PD powers, i.e., the 4th the 5th foot of PoE power supply unit PSE connects anode, and the 7th octal connects cathode, and another kind is to pass through signal
Line (1,2,3,6 pins in Fig. 1) realizes transmitting data and power supply to powered device PD simultaneously.
PoE interchanger in the prior art requires to provide the power-supply device of a standard in PoE interchanger, will
The operating voltage of PoE power supply unit PSE is clamped down between 48-75V, this undoubtedly makes the volume of water of entire PoE interchanger rise ship
Height, and cost is high, secondly PoE interchanger in the prior art is all to force to power to too net twisted pair, when PoE is set by electricity
When standby PD is damaged or short circuit occurred, human electric shock etc. is be easy to cause to endanger.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of PoE interchangers of non-standard power supply, without handing in PoE
It changes planes the internal power-supply device for adding standard, small volume, cost is low, and the network interface of PoE interchanger can detect automatically
Whether PoE powered device PD is connected, to determine whether PoE power supply unit PSE powers to too net twisted pair.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution:
A kind of PoE interchanger of non-standard power supply comprising power supply change-over device and power supply unit PSE；The power supply
Conversion equipment is converted to direct current supply voltage, the power supply change-over device for connecting alternating current, and by alternating current 220V AC voltage
Equipped with direct-flow positive pole end VMAIN and direct current negative pole end DGND；The power supply unit PSE, for being connect with powered device PD,
It include enhanced NMOS including exchanger chip, power switch unit and MCU microcontroller U11, the power switch unit
Pipe Q2, the control amplifying circuit containing switching tube Q1 and network interface output negative pole PORT_NEG, the power switch unit pass through
Network interface output negative pole PORT_NEG is connected between direct-flow positive pole end VMAIN and direct current negative pole end DGND, the enhanced NMOS
The grid of pipe Q2 is connect with direct-flow positive pole end VMAIN, and the source electrode of enhanced NMOS tube Q2 is connect with direct current negative pole end DGND, enhancing
The drain electrode of type NMOS tube Q2 is connect with network interface output negative pole PORT_NEG, and the direct-flow positive pole end VMAIN is also with switching tube Q1's
Collector connection, the MCU microcontroller U11 are used for the conducting and closing of control switch pipe Q1, the exchanger chip and MCU
Microcontroller U11 is configured to serial communication mode.
Further, the power supply change-over device includes that power input circuit, power conversion modules and power supply export back
Road, the power input circuit include rectification module and the filter module for being connected to rectification module, the power conversion modules
Coupling transformer T1 including being connected to filter module, the power supply output loop are equipped with power supply positive terminal VCC24, power supply cathode
It holds DGND2 and is connected to the common mode inductance LF3, the power supply positive terminal VCC24 of coupling transformer T1, power supply negative pole end
DGND2 is connected to the both ends of common mode inductance LF3.
Further, the power conversion modules further include electric current pwm chip U2 and switch mosfet pipe Q4, institute
The VCC pin for stating electric current pwm chip U2 is connect with filter module, and the COMP pin of electric current pwm chip U2 passes through light
Coupling device U3 is connect with power supply output loop, and the OUT pin of electric current pwm chip U2 passes through switch mosfet pipe Q4 and power supply
Output loop connection, the CS pin of electric current pwm chip U2 are connected with current sense resistor R48, the current sense resistor
R48 is also connect with switch mosfet pipe Q4.
Further, the coupling transformer T1 is equipped with the first winding Y1 and the second winding Y2, the first winding Y1
It is connect with common mode inductance LF3, the second winding Y2 is electrically connected with exchanger chip, MCU microcontroller.
Further, the VCC pin of the electric current pwm chip U2 is also connected with coupling coil L1, coupling coil L1
Also it is of coupled connections with the second winding Y2.
Further, the model GR8837R of the electric current pwm chip U2.
Power supply the utility model has the beneficial effects that in practical application, according to IEEE80 2.3af agreement, in the present embodiment
Equipment PSE is using idle line power supply (i.e. 4/5,7/8), and also the four, the 5th pins of power supply unit PSE and power supply are positive
Seven, the 85 pins of VMAIN connection, power supply unit PSE are connect with direct current negative pole end GND.Specifically, the MCU microcontroller
Device U11 and exchanger chip carry out serial communication, and whether the exchanger chip is used to detect switch port to connect and be set by electricity
Standby, the MCU microcontroller U11 actively reads information from exchanger chip, when exchanger chip detects power receiving equipment,
According to a pre-set procedure, MCU microcontroller U11 exports low level control signal POE_CTRL to MCU microcontroller U11,
The base stage of switching tube Q1 is acted on, and then turns off the switch pipe Q1, enhanced NMOS tube Q2 is connected in direct-flow positive pole end VMAIN at this time,
Network interface power supply output negative pole PORT_NEG flows to the source electrode of enhanced NMOS tube by the drain electrode of enhanced NMOS tube Q2 at this time, from
And with DC power supply reflux end DGND be connected, formed current supply circuit, power supply unit PSE to powered device PD power supply, it is on the contrary then also
So；The utility model, instead of that need to add standard inverters in PoE interchanger in the prior art, has by power supply change-over device
Using the manufacturing cost of the volume and reduction PoE interchanger that reduce PoE interchanger, passes through the power switch unit and control power supply
Power supply of the equipment PSE to powered device PD is used compared to non-standard PoE interchanger in the market to power supply unit PSE's
Network interface continued power is exported, which obviate when powered device PD damage or short circuit, human electric shock is caused to endanger.
Detailed description of the invention
Fig. 1 is the power supply the principle figure of PoE interchanger；
Fig. 2 is the circuit diagram of power switch unit；
Fig. 3 is the schematic diagram of MCU microcontroller U11；
Fig. 4 is the circuit diagram of power supply change-over device；
Fig. 5 is the circuit connection diagram of power supply output loop, filter module and electric current pwm chip U2.
Specific embodiment
For the ease of the understanding of those skilled in the art, the utility model is made below with reference to embodiment and attached drawing further
Explanation, the content that embodiment refers to not is restriction to the utility model.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of PoE interchanger of non-standard power supply provided by the utility model comprising electricity
Supply changeover device and power supply unit PSE；The power supply change-over device, for connecting alternating current, and by alternating current 220V AC voltage
Direct current supply voltage is converted to, the power supply change-over device is equipped with direct-flow positive pole end VMAIN and direct current negative pole end DGND；It is described
Power supply unit PSE, for being connect with powered device PD comprising exchanger chip, power switch unit and MCU microcontroller
U11, the power switch unit include enhanced NMOS tube Q2 and the common collector amplifying circuit control containing switching tube Q1
Amplifying circuit and network interface output negative pole PORT_NEG, the power switch unit pass through network interface output negative pole PORT_NEG connection
Between direct-flow positive pole end VMAIN and direct current negative pole end DGND, the grid and direct current supply voltage of the enhanced NMOS tube Q2
The VMAIN connection of direct-flow positive pole end, the source electrode of enhanced NMOS tube Q2 connect with direct current negative pole end DGND, enhanced NMOS tube Q2
Drain electrode connect with network interface output negative pole PORT_NEG, the direct-flow positive pole end VMAIN is also connect with the collector of switching tube Q1,
The MCU microcontroller U11 is used for the conducting and closing of control switch pipe Q1, the exchanger chip and MCU microcontroller U11
It is configured to serial communication mode.
In practical application, according to IEEE80 2.3af agreement, the power supply unit PSE in the present embodiment is powered using idle line
(i.e. 4/5,7/8), also the four, the 5th pins of power supply unit PSE are connect with power supply anode VMAIN, power supply unit PSE's
Seven, the 85 pins are connect with direct current negative pole end DGND.Specifically, the MCU microcontroller U11 is gone here and there with exchanger chip
Port communications, the exchanger chip is for detecting whether switch port connects powered device PD, the MCU microcontroller U11
Information actively is read from exchanger chip, when exchanger chip detects power receiving equipment, MCU microcontroller U11 is according in advance
The program of setting, MCU microcontroller U11 export low level control signal POE_CTRL, act on the base stage of switching tube Q1, into
And pipe Q1 is turned off the switch, power supply change-over device is connected enhanced by direct-flow positive pole end VMAIN output cathode DC voltage at this time
NMOS tube Q2 so that network interface power supply output negative pole PORT_NEG by enhanced NMOS tube Q2 drain electrode flow to it is enhanced
The source electrode of NMOS tube forms current supply circuit, power supply is set to be connected with DC power supply reflux end DGND inside power supply unit PSE
Standby PSE powers to powered device PD, it is on the contrary then；The utility model is by power supply change-over device instead of needing in the prior art
Add standard inverters in PoE interchanger, have using reduce PoE interchanger volume and reduce PoE interchanger manufacture at
This, controls power supply of the power supply unit PSE to powered device PD by the power switch unit, nonstandard compared in the market
Quasi- PoE interchanger is used to the output network interface continued power of power supply unit PSE, and which obviate when powered device PD damage or short
Lu Shi causes human electric shock to endanger.
As shown in Figure 4, Figure 5, in the present embodiment, the power supply change-over device includes power input circuit, power conversion mould
Block and power supply output loop, the power input circuit include rectification module and the filter module for being connected to rectification module,
The power conversion modules are equipped with the coupling transformer T1 for being connected to filter module, and the power supply output loop is equipped with power supply anode
End VCC24, power supply negative pole end DGND2 and the common mode inductance LF3 for being connected to coupling transformer T1, the power supply positive terminal
VCC24, power supply negative pole end DGND2 are connected to the both ends of common mode inductance LF3.Preferably, the coupling transformer T1 is equipped with
First winding and the second winding, first winding are connect with common mode inductance LF3, second winding and exchanger chip,
The electrical connection of MCU microcontroller.
In practical application, the 220V AC voltage of input power conversion equipment is handled by rectification module and filter module
Afterwards, wherein all the way via the first winding Y1 and common mode inductance LF3 collective effect after, be converted to 24V direct current supply voltage (i.e.
Power supply positive terminal VCC24, power supply negative pole end DGND2 described above), using the four, the 5th pins as power supply unit PSE
Supply voltage is converted to 8V supply voltage (i.e. Fig. 5 after effect of the another way of 220 alternating voltages via the second winding Y2
In VCC8V), in power supply unit PSE exchanger chip, MCU microcontroller U11 power supply, to drive exchanger core
Piece and MCU microcontroller U11 work, the utility model reduce the magnetic core damage of power supply change-over device by adding common mode inductance LF3
Consumption, improves the EMC index of power supply change-over device, improves the transfer efficiency of power supply change-over device.
Referring to fig. 4, in the present embodiment, the power conversion modules include that electric current pwm chip U2 and MOSFET are opened
Pipe Q4 is closed, the VCC pin of the electric current pwm chip U2 is connect with filter module, and the COMP of electric current pwm chip U2 draws
Foot connect by optocoupler U3 with output loop, the OUT pin of electric current pwm chip U2 pass through switch mosfet pipe Q4 and
The connection of power supply output loop, the CS pin of electric current pwm chip U2 are connected with current sense resistor R48, the current detecting
Resistance R48 is also connect with switch mosfet pipe Q4.
In practical application, power input circuit is used for 220V AC voltage rectifying and wave-filtering into the high electricity of smoother direct current
The DC high voltage is converted high-frequency pulse voltage by pressure, the electric current pwm chip U2, and the power supply output loop is logical
It crosses common mode inductance LF3 and high-frequency pulse voltage is converted into DC output voltage, specifically, electric current pwm chip U2 passes through OUT
Pin driving switch mosfet pipe Q4's is turned on and off, and the switch mosfet pipe Q4 is also connect with output loop, electric current PWM
The CS pin of control chip U2 is connect by current sense resistor R48 with switch mosfet pipe Q4, is exported to realize to power supply
The sampling in circuit, the electric current pwm chip U2 codetermine electric current pwm chip U2 according to COMP pin and CS pin
Inside PWM duty ratio, so as to adjust the switch off time of switch mosfet pipe Q4, the utility model, by output loop
Size of current sampled, to realize monitoring to power supply power supply；Further, by adding optocoupler U3, to defeated
Circuit carries out electrical isolation out, to shield；Preferably, the model of the electric current pwm chip U2
GR8837R。
As shown in figure 5, the VCC pin of the electric current pwm chip U2 is also connected with coupling coil in the present embodiment
L1, coupling coil L1 are also of coupled connections with the second winding Y2, thus to electric current pwm chip U2 continued power.
All technical characteristics in the present embodiment can be freely combined according to actual needs.
Above-described embodiment is the preferable implementation of the utility model, and in addition to this, the utility model can be with other sides
Formula realizes that any obvious replacement is in the protection model of the utility model under the premise of not departing from the technical program design
Within enclosing.
Claims (6)
1. a kind of PoE interchanger of non-standard power supply, it is characterised in that: including power supply change-over device and power supply unit PSE；Electricity
Supply changeover device is converted to direct current supply voltage, the power supply converting means for connecting alternating current, and by alternating current 220V AC voltage
Direct-flow positive pole end VMAIN and direct current negative pole end DGND is installed；
Power supply unit PSE, for being connect with power receiving equipment powered device PD comprising exchanger chip, power switch unit with
And MCU microcontroller U11, the power switch unit include enhanced NMOS tube Q2, the control amplification electricity containing switching tube Q1
Road and network interface output negative pole PORT_NEG, the power switch unit are connected to direct current by network interface output negative pole PORT_NEG
Between positive terminal VMAIN and direct current negative pole end DGND, the grid and direct-flow positive pole end VMAIN of the enhanced NMOS tube Q2 connects
It connects, the source electrode of enhanced NMOS tube Q2 is connect with direct current negative pole end DGND, and the drain electrode of enhanced NMOS tube Q2 and network interface output are negative
Pole PORT_NEG connection, the direct-flow positive pole end VMAIN are also connect with the collector of switching tube Q1, the MCU microcontroller U11
For the conducting and closing of control switch pipe Q1, the exchanger chip and MCU microcontroller U11 are configured to serial communication side
Formula.
2. a kind of PoE interchanger of non-standard power supply according to claim 1, it is characterised in that: the power supply converting means
It sets including power input circuit, power conversion modules and power supply output loop, the power input circuit includes rectification module
And it is connected to the filter module of rectification module, the power conversion modules include the coupling transformer for being connected to filter module
T1, the power supply output loop are equipped with power supply positive terminal VCC24, power supply negative pole end DGND2 and are connected to coupling transformer T1
Common mode inductance LF3, the power supply positive terminal VCC24, power supply negative pole end DGND2 are connected to the both ends of common mode inductance LF3.
3. a kind of PoE interchanger of non-standard power supply according to claim 2, it is characterised in that: the power conversion mould
Block further includes electric current pwm chip U2 and switch mosfet pipe Q4, the VCC pin of the electric current pwm chip U2 with
The COMP pin of filter module connection, electric current pwm chip U2 is connect by optocoupler U3 with power supply output loop, electric current
The OUT pin of pwm chip U2 is connect by switch mosfet pipe Q4 with power supply output loop, electric current pwm chip U2
CS pin be connected with current sense resistor R48, the current sense resistor R48 is also connect with switch mosfet pipe Q4.
4. a kind of PoE interchanger of non-standard power supply according to claim 3, it is characterised in that: the coupling transformer
T1 is equipped with the first winding Y1 and the second winding Y2, the first winding Y1 are connect with common mode inductance LF3, the second winding Y2
It is electrically connected with exchanger chip, MCU microcontroller.
5. a kind of PoE interchanger of non-standard power supply according to claim 4, it is characterised in that: the electric current PWM control
The VCC pin of chip U2 is also connected with coupling coil L1, and coupling coil L1 is also of coupled connections with the second winding Y2.
6. a kind of PoE interchanger of non-standard power supply according to claim 3, it is characterised in that: the electric current PWM control
The model GR8837R of chip U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821768706.2U CN208862853U (en) | 2018-10-29 | 2018-10-29 | A kind of PoE interchanger of non-standard power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821768706.2U CN208862853U (en) | 2018-10-29 | 2018-10-29 | A kind of PoE interchanger of non-standard power supply |
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| CN208862853U true CN208862853U (en) | 2019-05-14 |
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| CN201821768706.2U Active CN208862853U (en) | 2018-10-29 | 2018-10-29 | A kind of PoE interchanger of non-standard power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994973A (en) * | 2019-11-08 | 2020-04-10 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN112202571A (en) * | 2020-09-21 | 2021-01-08 | 普联国际有限公司 | POE power transmission device, POE switch and POE system |
| CN113777522A (en) * | 2020-06-10 | 2021-12-10 | 华为技术有限公司 | Power supply detection device and method and computer program product thereof |
-
2018
- 2018-10-29 CN CN201821768706.2U patent/CN208862853U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994973A (en) * | 2019-11-08 | 2020-04-10 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN113777522A (en) * | 2020-06-10 | 2021-12-10 | 华为技术有限公司 | Power supply detection device and method and computer program product thereof |
| WO2021249496A1 (en) * | 2020-06-10 | 2021-12-16 | 华为技术有限公司 | Power sourcing detection apparatus and method, and computer program product thereof |
| CN113777522B (en) * | 2020-06-10 | 2022-10-04 | 华为技术有限公司 | Power supply detection device and method and computer program product thereof |
| CN112202571A (en) * | 2020-09-21 | 2021-01-08 | 普联国际有限公司 | POE power transmission device, POE switch and POE system |
| CN112202571B (en) * | 2020-09-21 | 2023-03-17 | 普联国际有限公司 | POE power transmission device, POE switch and POE system |
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