Invention relates to a device for a network connection,
in addition to data, a supply current transferable
is and has at least one connector part.
Computers, printers, scanners, hard drives, multimedia devices and the like are now connected to exchange data over a network. As the standard for the wired data connection, the Ethernet has prevailed. There are different specifications and data transfer rates. Very common is the so-called Fast Ethernet with 100 MBit / s. For this purpose, eight-core cables are used and, as plug-in connectors, eight-pin connectors and sockets named RJ45 according to the standard IEC 60603-7 used.
However, it is possible that not only data about
the network will be transmitted. An evolution
introduces the so-called "Power over Ethernet",
abbreviated to "PoE" that connects to the network
connected devices via the Ethernet connection cable
and the connector parts additionally powered
can be. This can be with these consumers
Power supply can be saved and also deleted
the additional installation of power supply cables.
As a conductor, the unused or the signal-carrying
Wire pairs of the connection cable used for the network
according to the IEEE standard 802.3af the power consumption of energy consumers
is limited to about 13 W usable power is the power
over Ethernet so far limited to network-enabled devices,
who need relatively little energy,
like cameras or Wi-Fi access points. Because of this, the
future standard IEEE 802.3at developed as PoE +
is called and also devices with significantly higher power requirements
can supply the power of the transmission line
(a channel) of 15W (U = 48V, I = 320mA) to 30W (U = 72V;
I = 420 mA) is increased. For later
Standards are even planned for an output of 70W.
to prevent the energy consuming device (will
also called "powered device" or "PD" for short)
when connecting to the energy supplier ("Power Sourcing
Equipment "or" PSE "for short)
possibly too high voltage is damaged, is a protection circuit
Prior art, which controls the power supply of the PSE and initially
only a small voltage is applied to the PD. The protection circuit
also measures the input resistance of the PD, assigns it
a defined performance class and only then puts the full
Voltage depending on the measured resistance or
the associated performance class.
Disadvantage of high current flows, however, is that
when disconnecting, ie when pulling out the RJ45 connector
from the ethernet socket, break-off sparks arise, which are their electrical
Destroy contacts permanently. It is also important to take into account
that the Ethernet connector parts in terms of their dimensions only
on the data transfer, but not on the transfer
are designed by high supply currents.
above-mentioned protection circuit can not prevent break-off sparks
because when disconnecting the full voltage is still applied.
The invention is therefore to propose a device by
the formation of switching or Abreißfunken when disconnecting
the connection is reliably prevented.
Task is in accordance with the main claim in a device
with at least one connector part for a network connection,
in addition to data, a supply current transferable
is, solved by the fact that the connector part a
Detection means which is set up, the release
recognize the connection and a leading signal for switching
to supply the power supply, so connect to power contacts
no break-off spark forms. The detection means switches the power supply
of the energy supplier or the energy consumer in such a way,
that the applied voltage is either diminished or completely
is turned off. This happens prematurely, that is, before the data
and power transmitting connection between the two devices
is disconnected. Therefore, it can be between the contacts of the connector parts
come to no sparking.
Embodiments are specified in the subclaims and
are explained below.
Switch off or reduce the voltage before disconnecting the connection
can be done easily by the recognition means
is placed directly in the supplying circuit to switch it.
The detection means may also be connected to a circuit arrangement which is connected to the supplying circuit or a power supply unit, in particular a power supply. The circuit then measures via the resistance of the detection means whose circuit state and controls the on coupled, powering circuit by turning on or off or reducing the voltage. The circuit arrangement can also be connected to a power supply and in this way regulate the current via a voltage change.
Detection means as is leading electrical contact of the connector part
educated. Leading contact means that an electric
Contact of the connector part closed at a time
or is opened before the contacts of the connector parts
to be separated for data and power transmission. By
the leading contact can thus prematurely interrupt the power
become. The leading electrical contact can, as described above,
arranged directly in the supplying circuit or with a circuit arrangement
be connected, which controls the power.
Detecting means can also be used as a mechanical switch, in particular
Micro switch, or is designed as an optical switch. Of the
For example, optical switches may include light emitting diodes and photodiodes.
Plug-in connector is designed as RJ45 plug or as RJ45 socket
This makes it possible to establish a network connection via Ethernet.
have a latching tongue in the RJ45 socket when plugging
engages and locks both connectors. To her
To be able to solve it again first
be pressed on the latching tongue. The timing
the latching tongue is therefore necessarily a separation of the electrical
Contacts of RJ45 plug and RJ45 socket ahead. It is because of that
advantageous in that the detection means with a latching tongue of the plug
mechanically connected, because in this way the switch in front
the separation is actuated. Here for the detection means
a microswitch provided. As a means of detection can also the
Detent tongue itself be formed by electrically conductive
Has switching contacts.
Recognition means may also be arranged on the socket. It is
then, for example, designed as a pressure-sensitive micro-switch, the
so arranged on the socket that he mechanically by a
plugged in when pulling out is actuated,
before the electrical contacts of RJ45 plug and RJ45 socket
Recognition means may also be a contact strip or movable circuit board
be that when pulling the plug from the socket a movable
PCB is moved, thus closing a contact.
Depending on the construction or arrangement, when operated
opened by pulling out the plugged plug switching contacts
The invention will be exemplified with reference to a drawing
described, with further advantageous details the figures
can be taken from the drawing.
the same parts are provided with the same reference numerals.
Figures of the drawing show in detail:
1 a schematic representation of two connected data transmission and power supply systems,
2a a RJ45 socket with plug in vertical section,
2 B a RJ45 jack with plug out 2a with pressed latch,
3a a RJ45 socket with detection means and inserted plug in vertical section,
3b an RJ45 socket out 3a with partially unplugged plug, and
4 schematically the basic structure of a circuit arrangement of the device with a protection circuit.
1 shows a schematic representation of two connected data transmission and power supply systems. These are a data-transmitting, power-supplying device 9 (Power Sourcing Equipment, PSE) and a data-transmitting, power-consuming device 10 (Powered Device, PS). Both devices 9 . 10 Each has an Ethernet socket as connection 3 on, in which a connecting cable 4 with matching RJ45 plugs 2 is plugged. In the drawing, for reasons of clarity, only three wires 14 of the cable 4 while common Ethernet cables have eight wires. Both sockets 3 are with a data interface 7 connected to the data via the cable 4 transferred to. In this way, a common Ethernet network is formed.
In addition, both devices 9 . 10 for "Power over Ethernet", short PoE furnished. Here to the power supply unit PSE 9 a power supply 6 on that too with the ethernet jack 3 connected is. The supply current is so over the Ethernet cable 4 the power consuming Ge advises PD 10 provided and can by a consumer 8th be used. For example, this can be done on a separate power supply of the PD 10 be waived. The supply current can also be via the wires 14 of the Ethernet cable 4 are transmitted, which serve the data transmission, since it is the supply current to DC while the data is transmitted in a frequency modulated manner.
Disconnect the connection by putting one of the plugs 2 from a socket 3 pulls, then can plug in between the electrical contacts 2 and socket 3 form a break-off spark that permanently damages the electrical contacts and the connector parts. To prevent this, is on at the connector part 1 a detection means 5 provided that turns off the power before the power-supplying circuit by pulling out a plug 2 is interrupted. The detection means 5 is with a control circuit 11 connected, in turn, the power supply of the power supply 6 turns on or off. The detection means 5 but could also be designed as a switch and directly turn on or off the power supply circuit. The detection means can 5 be formed as well as leading contact and interrupt the supply current before the electrical contacts of the connector part 1 be separated. It may alternatively be a mechanical or optical switch, either on the socket 3 or on the plug 2 is arranged (see also the 2a to 3b ). A detection means 5 is both the connector part 1 of the PD 10 as well as at the connector part 1 of the PSE 9 provided to both devices 9 . 10 before pulling out the plug 2 to switch off the supply current. Will the plug 2 from the socket 3 of energy consuming PD 10 pulled, then closes, for example, designed as a switch detection means 5 one or more wire pairs 14 acting as a signal line 17 serve, in short. The change of the resistance of the signal line 17 is from the control circuit 11 measured, then the power supply 6 off.
An embodiment of the device show the 2a and 2 B in which a RJ45 socket 3 with plug 2 shown in vertical section. The plug 2 is in the socket 3 plugged in and is in this position by a latching tongue 12 with a catch 15 held. The power is supplied by a pair of wires 14 and electrical contacts 16 on the plug 2 and at the socket 3 as well as via a power line 18 , The catch tongue 12 and plugs 2 have switching contacts 13 and thus form the detection means 5 , The switching contacts 13 are via a signal line 17 with the power line 18 connected.
To plug 2 and socket 3 must be able to solve mechanically, first on the latching tongue 12 be pressed. The temporal operation of the latching tongue 12 is therefore necessarily a separation of the electrical contacts 16 from plug 2 and socket 3 ahead, like 2 B shows. By pressing the latching tongue 12 become the switching contacts 13 pressed on each other and close the supply circuit 18 short. To avoid a current spike, can be in the signal line 17 serially connected also a resistor. By pressing the latching tongue 12 thus reduces the resistance within the circuit 18 , This change is made by a control circuit 11 measured, which is connected to the power supply and turns off the power. There is then no or a low voltage on the power contacts 16 on and between the contacts 16 no electricity flows. When the plug 2 is completely pulled out and the power contacts 16 Consequently, no break-off spark is formed.
Another embodiment of the device show the 3a and 3b in which a RJ45 socket 3 with detection means 5 and plugged in 2 shown in vertical section. This is from two contacts 13 formed detection means on the socket 3 arranged. The power line 18 via the power contacts 16 , Since it is a representation in cross section, is only a current contact pair 16 for a vein 14 visible, although a total of eight wires are present. In the fully inserted condition, as in 3a shown, the two contacts 13 of the recognition agent 5 pressed on each other and thus close a signal circuit 17 , Will the plug 2 partly pulled out, as in 3b shown, then the signal circuit 17 interrupted, because the switching contact 13 is elastically resetting.
The operation of the switch 5 That is, the change in resistance in the switching circuit 17 is from a (not shown) control circuit 11 measured and the supply current in the supply circuit 18 is switched off. When the plug 2 is completely pulled out, therefore there is no voltage on the power contacts 16 why it does not lead to the formation of tearing sparks.
4 schematically shows the basic structure of another embodiment of the circuit arrangement of the device. In contrast to 1 is a protection circuit 20 intended.
The circuit arrangement has as a detection means a switch 5 on when releasing plug 2 and socket 3 (not shown) is advanced. The desk 5 is with a control circuit 11 connected to the switching state of the scarf ters 5 measures, for example, about its resistance. The control circuit 11 is again with a power supply unit 6 connected. Will the switch 5 then the control circuit switches 11 the power supply power supply 6 in the current output of the power supply 6 applied voltage is reduced or switched off. Thereby, as in the embodiments described above, sparking upon disconnection of electrically conductive contacts (not shown, see FIGS 2a to 3b ) avoided.
However, the circuit arrangement has an additional feature with an additional advantage. With the power supply 6 is also a protection circuit 20 connected. The protection circuit 20 measures the internal resistance 19 a connected PD or consumer and controls depending on the power supply 6 delivered tension. If no consumer is connected, then the protection circuit regulates 20 For safety reasons, the voltage of the power supply 6 down. Such a protection circuit 20 is state of the art. The disadvantage, however, is that the control process of the protection circuit 20 can reduce the "bandwidth" or the data transmission rate, because during the measurement the data transmission has to be interrupted for a short time.
To solve this additional problem is the control circuit 11 with the protection circuit 20 connected. The control circuit 11 is due to the switching state of the recognition means 5 "Known", whether already has a network connection between devices 9 . 10 (not shown, see 1 ) is made. If a connection is already established, the function of the protection circuit 20 no longer needed. The control circuit 11 therefore switches the unnecessary protection circuit 20 from. As a result, there are no interruptions in the data transmission by the protection circuit 20 and the transmission rate is increased.
- A plug connector
- connection cable
- recognition means
- power adapter
- Data Interface
- power company
- electricity consumers
- control circuit
- catch tongue
- switching contact
- locking lug
- current contacts
- signal line
- power line
- internal resistance
- protection circuit
QUOTES INCLUDE IN THE DESCRIPTION
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Cited non-patent literature