CN203086339U - POE power supply device port circuit and POE power supply device - Google Patents
POE power supply device port circuit and POE power supply device Download PDFInfo
- Publication number
- CN203086339U CN203086339U CN 201220741940 CN201220741940U CN203086339U CN 203086339 U CN203086339 U CN 203086339U CN 201220741940 CN201220741940 CN 201220741940 CN 201220741940 U CN201220741940 U CN 201220741940U CN 203086339 U CN203086339 U CN 203086339U
- Authority
- CN
- China
- Prior art keywords
- output
- pwm control
- termination
- control unit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a POE power supply device port circuit and a POE power supply device. The POE power supply device port circuit comprises a DC input end, a DC output end, a PWM control unit, an electronic switch, an output current sampling circuit and an output voltage sampling circuit. The electronic switch is in series connection between the DC input end and the DC output end. A control end of the electronic switch is connected with a PWM control signal output end of the PWM control unit. A signal output end of the output current sampling circuit is connected with a current sampling signal input end of the PWM control unit. An output end of the output voltage sampling circuit is connected with a voltage sampling signal input end of the PWM control unit. The POE power supply device comprises a DC power supply and a plurality of the POE power supply device port circuits, and DC input ends of the port circuits are connected with an output end of the DC power supply. According to the POE power supply device port circuit and the POE power supply device, when an output power exceeds a set limit, the output is cut, and restart can be tried, security risks existing in the application process are reduced, and a function of output power limit protection by a standard PSE device can be realized.
Description
[technical field]
The utility model relates to the Power over Ethernet technology, relates in particular to a kind of POE charger port circuit and POE charger.
[background technology]
Power over Ethernet technology (POE) is in wireless coverage, security protection, etc. the application of occasion more and more widely, be the various application of standard, the IEEE802.3 standard code two kinds of standard application, wherein the long-term power of af regulation is 13w, the long-term power of at regulation is 25w, in the application of satisfying this standard, need adopt PSE(power source equipment at feeder ear) equipment powers, need adopt PD(power device at receiving end) be subjected to electric control, by standard code a series of power detection and Power Limitation related protocol and application.The application of satisfying this standard agreement can be satisfied the requirement of safety.
In actual use, owing to realize that the POE cost of standard agreement is very high, wish in some applications that on the other hand the requirement that use power is above standard and limits, these occasions need a large amount of off-gauge POE products that use.In these off-gauge application, the product of existing market is only supplied with power supply network interface output (most of employing 4,5 just, 7,8 negative powering modes), perhaps recoverable fuse of series connection reduces the risk that accident takes place in the loop, but in this case, port does not almost have current limliting, has very big potential safety hazard.
[summary of the invention]
The technical problems to be solved in the utility model provides a kind of POE charger port circuit that can reduce nonstandard POE application safety risk.
Another technical problem that will solve of the utility model provides a kind of POE charger that can reduce nonstandard POE application safety risk.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of POE charger port circuit, comprise direct-flow input end, dc output end, PWM control unit, electronic switch, output current sample circuit and output voltage sampling circuit, electronic switch is serially connected between direct-flow input end and the dc output end, the pwm control signal output of the control termination PWM control unit of electronic switch; The signal output part of output current sample circuit connects the current sampling signal input of PWM control unit; The voltage sampling signal input of the output termination PWM control unit of output voltage sampling circuit.
Above-described POE charger port circuit, described electronic switch is triode or metal-oxide-semiconductor.
Above-described POE charger port circuit comprises output capacitance, inductance and diode, and described output current sample circuit comprises sampling resistor, and described electronic switch is the N-channel MOS pipe; The grid of N-channel MOS pipe connects the pwm control signal output of PWM control unit, and source electrode connects first end of sampling resistor, the second end ground connection of sampling resistor; The drain electrode of N-channel MOS pipe connects first end of inductance, the negative pole of the second termination dc output end of inductance; The positive pole of the first termination dc output end of output capacitance, the negative pole of the second termination dc output end, the anode of diode connect first end of inductance, and negative electrode connects first end of output capacitance; First end of the current sampling signal input termination sampling resistor of PWM control unit; The positive pole of direct-flow input end connects the dc output end positive pole, the minus earth of direct-flow input end.
Above-described POE charger port circuit, the negative pole of a termination dc output end of output voltage sampling circuit, the voltage sampling signal input of another termination PWM control unit.
Above-described POE charger port circuit comprises output capacitance, inductance and diode, and described output current sample circuit comprises sampling resistor, and described electronic switch is the P channel MOS tube; The grid of P channel MOS tube connects the pwm control signal output of PWM control unit, and drain electrode connects the positive pole of direct-flow input end, and source electrode connects first end of inductance, the positive pole of the second termination dc output end of inductance; The negative pole of the first termination dc output end of sampling resistor, the second end ground connection of sampling resistor; The positive pole of the first termination dc output end of output capacitance, the negative pole of the second termination dc output end, the anode of diode connect second end of output capacitance, and negative electrode connects first end of inductance; First end of the current sampling signal input termination sampling resistor of PWM control unit; The minus earth of direct-flow input end.
Above-described POE charger port circuit, a termination dc output end positive pole of output voltage sampling circuit, the voltage sampling signal input of another termination PWM control unit.
A kind of technical scheme of POE charger comprises DC power supply and plurality of ports circuit, and described port circuit is with above-mentioned POE charger port circuit; The direct-flow input end of port circuit connects the output of DC power supply.
When the utility model POE charger port circuit and POE charger surpass the limit value of setting when output current; cut off output; and can attempt restarting, reduced the security risk that exists in the application process, can realize the function of standard P SE equipment to the power output limiting protecting.
[description of drawings]
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the theory diagram of the utility model embodiment 1 POE charger.
Fig. 2 is the circuit diagram of the utility model embodiment 2 POE charger port circuits.
Fig. 3 is the circuit diagram of the utility model embodiment 3 POE charger port circuits.
[embodiment]
As shown in Figure 1, the POE charger of the utility model embodiment 1 is a kind of POE charger with Port Management function.Comprise DC power supply and network interface plate with port controlling function.
DC power supply is a Switching Power Supply, and voltage and power requirement satisfy application need, and is consistent with common communication power supply.
The network interface plate has the corresponding port circuit at every network port.Port circuit is mainly realized Current limited Control and short-circuit protection; its basic principle is under normal output situation; (can be metal-oxide-semiconductor or triode, according to the circuit difference of reality, can be PMOS to electronic switch; NMOS; the NPN triode, the PNP triode) be in complete conduction status, when output overcurrent or short circuit; control circuit detects output current to transfinite, and turn-offs output rapidly.Behind certain hour, for exporting judgement, switch carries out the PWM action, and the detection that this moment, control circuit carried out current/voltage judges determine whether output normal, and if normally the complete conducting of switching tube normally export.If undesired, then protect once more.By above method, can realize overload to network port output, short-circuit detecting and protection realize restarting output simultaneously.
Network interface plate port circuit can adopt the POE charger port circuit of embodiment 2 or 3.The direct-flow input end of port circuit connects the output of DC power supply.
As shown in Figure 2, the utility model embodiment 2 POE charger port circuits comprise direct-flow input end, dc output end, PWM control unit, electronic switch, output current sample circuit and output voltage sampling circuit.
The output current sample circuit comprises sampling resistor R8, and electronic switch Q3 is the N-channel MOS pipe.The grid of N-channel MOS pipe connects the pwm control signal output of PWM control unit, and source electrode connects first end of sampling resistor R8, the second end ground connection of sampling resistor R8.The drain electrode of N-channel MOS pipe connects first end of inductance L 1, the negative pole POE-of the second termination dc output end of inductance L 1.The anodal POE+ of the first termination dc output end of output capacitance C2, the negative pole POE-of the second termination dc output end, the anode of diode D1 connect first end of inductance L 1, and negative electrode connects first end of output capacitance C2.First end of the current sampling signal input termination sampling resistor R8 of PWM control unit.Positive pole+the 53.5V of direct-flow input end connects the anodal POE+ of dc output end, the minus earth of direct-flow input end.One termination dc output end negative pole POE-of output voltage sampling circuit, the voltage sampling signal input of another termination PWM control unit.
The PWM control unit can be a microprocessor, as the Freescale single-chip microcomputer, and the DSP of TI etc.
Demand in the practical application is, the power of the work of every road POE charger port circuit is 40w, and output voltage is 53.5V, and load current is 0.75A.For guaranteeing the time service allowance, output overcurrent protection point is set is 0.8-1A.The Switching Power Supply of prime is 150w.
POE charger port circuit is enough realized the accurate current limliting of every port, exports defencive functions such as long-term short circuit, can restart after output overloading and short circuit elimination, and port is normally exported.
Switching tube Q1 in the POE charger port circuit of present embodiment; inductance L 1; diode D1; output capacitance C2 forms a Buck circuit; switch Q1 is being carried out under the situation of PWM control, by to the switch current detecting, output voltage detection etc. can be transshipped to output state; judgements such as short circuit, thus carry out corresponding protection or operate as normal action.
As shown in Figure 3, the utility model embodiment 3 POE charger port circuits comprise direct-flow input end, dc output end, PWM control unit, electronic switch, output current sample circuit and output voltage sampling circuit equally.
The output current sample circuit comprises sampling resistor R9.As different from Example 2, electronic switch Q4 is the P channel MOS tube; The grid of P channel MOS tube connects the pwm control signal output of PWM control unit, the anodal POE+ of drain electrode direct-flow input end, and source electrode connects first end of inductance L 2, the positive pole of the second termination dc output end of inductance L 2.The negative pole POE-of the first termination dc output end of sampling resistor R9, the second end ground connection of sampling resistor R9; The anodal POE+ of the first termination dc output end of output capacitance C4, the negative pole POE-of the second termination dc output end.The anode of diode D2 connects second end of output capacitance C4, and negative electrode connects first end of inductance L 2.First end of the current sampling signal input termination sampling resistor R9 of PWM control unit; The anodal POE+ of one termination dc output end of output voltage sampling circuit, the voltage sampling signal input of another termination PWM control unit.The minus earth of direct-flow input end.
Present embodiment adopts the P channel MOS tube to control, and the difference of using with the N-channel MOS pipe is, PMOS is positioned over the anode of output, and its drive controlling mode and N-channel MOS are different simultaneously, and its operation principle is consistent with the application of N-channel MOS.
Switching tube Q4 in the POE charger port circuit of present embodiment; inductance L 2; diode D2; Buck circuit of the same formation of output capacitance C4; switch Q4 is being carried out under the situation of PWM control, by to the switch current detecting, output voltage detection etc. can be transshipped to output state; judgements such as short circuit, thus carry out corresponding protection or operate as normal action.
The above embodiment of the utility model especially is adapted to port is carried out application requirements under the Power Limitation situation, is characterized in realizing the Power Limitation of every port, the size that can regulate power-limiting according to actual needs.By the circuit of above embodiment, can guarantee the overload protection of output port, controlled function such as short circuit, after can realizing simultaneously removing overload and short-circuit protection, the port restart facility.Adopt the circuit of above embodiment, can realize in the standard P OE definition other function of PSE except that the differentiated control function,, export and function such as restart as output current limiting and protection.Adopt this POE charger with Port Management function, the PSE of alternate standard function can avoid adopting simultaneously the various risks of not being with the current limliting management function to cause fully.
Claims (7)
1. POE charger port circuit, it is characterized in that, comprise direct-flow input end, dc output end, PWM control unit, electronic switch, output current sample circuit and output voltage sampling circuit, electronic switch is serially connected between direct-flow input end and the dc output end, the pwm control signal output of the control termination PWM control unit of electronic switch; The signal output part of output current sample circuit connects the current sampling signal input of PWM control unit; The voltage sampling signal input of the output termination PWM control unit of output voltage sampling circuit.
2. POE charger port circuit according to claim 1 is characterized in that described electronic switch is triode or metal-oxide-semiconductor.
3. POE charger port circuit according to claim 2 is characterized in that, comprises output capacitance, inductance and diode, and described output current sample circuit comprises sampling resistor, and described electronic switch is the N-channel MOS pipe; The grid of N-channel MOS pipe connects the pwm control signal output of PWM control unit, and source electrode connects first end of sampling resistor, the second end ground connection of sampling resistor; The drain electrode of N-channel MOS pipe connects first end of inductance, the negative pole of the second termination dc output end of inductance; The positive pole of the first termination dc output end of output capacitance, the negative pole of the second termination dc output end, the anode of diode connect first end of inductance, and negative electrode connects first end of output capacitance; First end of the current sampling signal input termination sampling resistor of PWM control unit; The positive pole of direct-flow input end connects the dc output end positive pole, the minus earth of direct-flow input end.
4. POE charger port circuit according to claim 3 is characterized in that, the negative pole of a termination dc output end of output voltage sampling circuit, the voltage sampling signal input of another termination PWM control unit.
5. POE charger port circuit according to claim 2 is characterized in that, comprises output capacitance, inductance and diode, and described output current sample circuit comprises sampling resistor, and described electronic switch is the P channel MOS tube; The grid of P channel MOS tube connects the pwm control signal output of PWM control unit, and drain electrode connects the positive pole of direct-flow input end, and source electrode connects first end of inductance, the positive pole of the second termination dc output end of inductance; The negative pole of the first termination dc output end of sampling resistor, the second end ground connection of sampling resistor; The positive pole of the first termination dc output end of output capacitance, the negative pole of the second termination dc output end, the anode of diode connect second end of output capacitance, and negative electrode connects first end of inductance; First end of the current sampling signal input termination sampling resistor of PWM control unit; The minus earth of direct-flow input end.
6. POE charger port circuit according to claim 5 is characterized in that, a termination dc output end positive pole of output voltage sampling circuit, the voltage sampling signal input of another termination PWM control unit.
7. a POE charger comprises DC power supply and plurality of ports circuit, it is characterized in that, described port circuit is the described POE charger of an arbitrary claim port circuit among the claim 1-6; The direct-flow input end of port circuit connects the output of DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220741940 CN203086339U (en) | 2012-12-28 | 2012-12-28 | POE power supply device port circuit and POE power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220741940 CN203086339U (en) | 2012-12-28 | 2012-12-28 | POE power supply device port circuit and POE power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203086339U true CN203086339U (en) | 2013-07-24 |
Family
ID=48832142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220741940 Expired - Fee Related CN203086339U (en) | 2012-12-28 | 2012-12-28 | POE power supply device port circuit and POE power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203086339U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701618A (en) * | 2013-12-27 | 2014-04-02 | 上海斐讯数据通信技术有限公司 | POE (power over Ethernet) switch port setting power limiting value validating method |
| CN106711928A (en) * | 2017-01-16 | 2017-05-24 | 努比亚技术有限公司 | Short-circuit protection device, as well as short-circuit protection method and short-circuit protection circuit thereof |
| CN110941224A (en) * | 2019-12-25 | 2020-03-31 | 北京东方微视科技有限公司 | Distributed POE equipment power acquisition and intelligent management system |
-
2012
- 2012-12-28 CN CN 201220741940 patent/CN203086339U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701618A (en) * | 2013-12-27 | 2014-04-02 | 上海斐讯数据通信技术有限公司 | POE (power over Ethernet) switch port setting power limiting value validating method |
| CN106711928A (en) * | 2017-01-16 | 2017-05-24 | 努比亚技术有限公司 | Short-circuit protection device, as well as short-circuit protection method and short-circuit protection circuit thereof |
| CN110941224A (en) * | 2019-12-25 | 2020-03-31 | 北京东方微视科技有限公司 | Distributed POE equipment power acquisition and intelligent management system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101815378B (en) | LED constant current source output short circuit protection circuit | |
| CN102593788A (en) | Short circuit/ overcurrent protection controller and operation method | |
| CN104184124A (en) | Direct current breaker for high-frequency switch power supply system and overload protection method | |
| CN204156508U (en) | Short-circuit protection circuit of lithium battery | |
| CN204144918U (en) | The DC circuit breaker that a kind of high frequency switch power supply system uses | |
| CN103050932A (en) | Electronic switch circuit for power over Ethernet | |
| CN202633893U (en) | Short circuit/overcurrent protection controller | |
| CN203086339U (en) | POE power supply device port circuit and POE power supply device | |
| CN104836196A (en) | Overcurrent protection circuit started in time-delay manner | |
| CN202034765U (en) | Switch power source short circuit protection circuit | |
| CN101259449B (en) | Automatically power-off system of paper chipper and automatically power-off method | |
| CN210640722U (en) | Battery switch circuit and power supply management system comprising same | |
| CN104158152A (en) | Motor driver protection circuit and motor driver protection method | |
| CN203883257U (en) | Remote control smart power strip by use of mobile phone | |
| CN202678921U (en) | Overcurrent fault alarm device used on high-voltage transmission lines | |
| CN202841160U (en) | Ethernet power supply circuit and port circuit | |
| CN204441855U (en) | A kind of under voltage trip gear | |
| CN107395175B (en) | MOS tube overcurrent protection circuit | |
| CN202917939U (en) | Short circuit protection circuit | |
| CN203326551U (en) | Magnetic latching non-stick over-voltage and under-voltage protector | |
| CN211266446U (en) | Circuit breaker protection device | |
| CN212622884U (en) | Power grid detection and protection circuit | |
| CN2478167Y (en) | Computer power supply device preventing error operation | |
| CN203748088U (en) | Light controlling means | |
| CN106025724A (en) | Intelligent socket for set-top box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20191228 |