CN2514565Y

CN2514565Y - Power reverse connecting-preventing device for network communication interface equipment

Info

Publication number: CN2514565Y
Application number: CN 02215090
Authority: CN
Inventors: 张戟
Original assignee: AITONG ELECTRIC Co Ltd SHANGHAI
Current assignee: AITONG ELECTRIC Co Ltd SHANGHAI
Priority date: 2002-01-10
Filing date: 2002-01-10
Publication date: 2002-10-02
Anticipated expiration: 2012-01-10

Abstract

A power reverse connection preservation device of apparatus-net communication interfaces comprises an interface and an integrated circuit of 5V power supply. The utility model is characterized in that the device also comprises a power reverse connection preservation protecting element which is a four-port element, wherein two input ports are respectively connected with the positive wire and the negative wire of the 24V power supply of an apparatus-net bus, and the two corresponding output ports are respectively connected with the voltage input end and the ground terminal of the integrated circuit of the power supply. The utility model thoroughly resolves the question of the damage accidents which are caused by reverse connection of power supply in the prior art.

Description

The anti-power supply reversal connecting device of facility network communication interface

Technical field

The utility model relates to the improvement structure of a kind of Device Net (facility network) communication interface, specifically, relates to set up an anti-power supply reversal connecting device on the facility network communication interface.

Background technology

As everyone knows, Device Net is a kind of communication bus cheaply, it is with industrial equipment, for example: limit switch, photoelectric sensor, valve group, motor starting device, process sensor, barcode reader, variable frequency drives, panel display and operator interface etc. are connected to network, thereby have eliminated expensive hardwire cost.Device Net is when allowing a plurality of complex device to connect, also allow the interchangeability of simple device, the direct interconnection that Device Net provides, obviously improved the communication of equipment room, and provide the device level diagnostic function that is difficult to realize with the hardwire interface simultaneously, therefore, Device Net has a wide range of applications aspect industrial automation.Wherein, be the I/O data between solution intelligent pump/valve control and the DeviceNet network master and the exchange of other setting data; be extensive use of Device Net communication interface at present; it is a kind of independently intelligent equipment; but because its+voltage input end of 5V power supply integrated circuit directly and the 24V power line in the Device Net bus be connected; not not anti-power supply reverse connecting protection device; therefore; when using this Device Net communication interface, regular meeting causes the system equipment damage accident because of the power supply reversal connection.

Summary of the invention

The purpose of this utility model provides a kind of anti-power supply reversal connecting device of facility network communication interface, promptly on the facility network communication interface ,+voltage input end of 5V power supply integrated circuit and the 24V electrode line of facility network bus; One anti-power supply reverse connecting protection device is set, to overcome the device damage accident that causes owing to the power supply reversal connection between the negative line.

The utility model is to realize like this, it comprises Device Net communication interface+5 volts of power ICs, characteristics are, also have anti-power supply power supply reverse connecting protection parts, these power supply reverse connecting protection parts are one four port part, and its two input is the 24V positive source line and the negative line of connection device network bus respectively; Its corresponding two output ports then connect the voltage input end and the earth terminal of this power IC respectively.Like this, when the facility network communication interface card hangs up Device Net bus, if input power supply (24V, DC) polarity is correct, then be back to the 24V power cathode line formation closed-loop path of facility network bus through the utility model device from the 24V of facility network bus positive source line, and foundation+5V power supply source is powered to the facility network communication interface, otherwise, then because anti-power supply reversal connecting device of the present utility model, and can not form the closed-loop path, protected the safe in utilization of facility network communication interface card and relevant device;

Further; said anti-power supply reversal connection parts, it comprise the 24V positive source line of a positive terminal connection device network bus and the field effect transistor protected location of voltage input end that negative pole end connects this power IC with an anodal earth terminal that is connected this power IC and the diode of the 24V power-polar curve of negative pole connection device network bus.This field effect transistor protected location system is based on a N type field effect transistor Q1, the voltage input end that the 24V positive source line of its source S connection device network bus, drain D connect this power IC, the control grid G then connects the dividing point of cross-over connection in the voltage divider of the 24V of facility network bus positive source line, negative line, more specifically, said N type field effect transistor Q1 is an IRFD9120 type field effect transistor, and resistance R 1, R2 series connection that said voltage divider is equated by two resistances constitute, said resistance R 1, R2, their resistance is 10K Ω; Said diode is an IN5819 type diode;

In addition; said power supply reverse connecting protection parts; it comprises the 24V positive source line of an anodal connection device bus and negative pole connects the diode of the voltage input end of this power IC, with the anodal earth terminal that is connected this power IC of another and the diode of the 24V power-polar curve of negative pole connection device bus.

The utility model has the advantages that: owing between the electrode line of the integrated circuit of the 5V of facility network communication interface card power supply and facility network bus 24V power supply, negative line, set up anti-power supply reverse connecting protection device; thereby, fundamentally eliminated the docking port card that causes because of the power supply reversal connection and the breaking-up accident of relevant device, guaranteed safe in utilization.

Description of drawings

Fig. 1 is the block diagram that the utility model is installed in the facility network communication interface.

Fig. 2 is embodiment circuit theory diagrams of the present utility model.

Fig. 3 is another embodiment circuit theory diagrams of the present utility model.

Embodiment

Provide two embodiment of the utility model according to Fig. 1～Fig. 3 below; by description to these two embodiment; ins and outs of the present utility model are provided; enable to understand better architectural feature of the present utility model and functional characteristics, they are to be used for illustrating the utility model rather than to be used for limiting rights protection scope of the present utility model.

See also shown in Figure 1, anti-power supply reversal connecting device of the present utility model is mounted on DeviceNet (facility network) communication interface, existing Device Net communication interface khaki+5V power supply is to adopt by power IC 1 directly the 24V power supply that provides on the electrode line 2 of the 24V power line on the Device Net bus and the negative line 3 (direct voltage is from 25 volts-11 volts) to be converted to+the 5V power supply, the facility network communication interface card single-chip microcomputer of present embodiment is W78E58, dual port RAM is IDT7005, lan controller is SJA1000, local area network transceiver is 82C251, the address of the right output port of dual port RAM IDT7005 wherein, data and read-write control line are connected with the corresponding signal line of Single Chip Microcomputer (SCM) system respectively, and interrupt signal connects the external interrupt 0 of this single-chip microcomputer; The address of its left port, data and read-write, interruption controls line are connected to the respective pin of 34 needle interfaces according to the interface standard of Any Bus, and toggle switch and state LDE show it then is to realize that by one group of toggle switch and two two-color diodes MAC Address, baud rate equipment and the node of nodes and network state show.Because Device Net supports 63 Slave (slave station) node at most, and have only the available of three kinds of baud rates, therefore, only need one 8 DIP switch just can realize the equipment (wherein six are used for device mac address, and two are used for selecting baud rate) of the baud rate of MAC Address.Adopt a two-color diode to indicate respectively for node and network state.Because the restriction of interface microcontroller by output interface of a slice 74HC273 lock device expansion, shows thereby drive two two-color diodes in the hardware.

See also shown in Figure 2, the 5V power IC 1 of present embodiment adopts integrated package MC7805T, according to conventional connection, meet a high-frequency filter capacitor C1 between its voltage input end 11 and the earth terminal 12, C1=0.22 μ F, high-frequency filter capacitor C2 in parallel between its output and ground, C2=0.1 μ F and a low frequency filtering capacitor C 3, C3=100 μ F.

In the present embodiment; adopting an IRF9120 type field effect transistor Q1 is that main body constitutes field effect transistor protected location 41; it is a N type field effect transistor; and the voltage divider 410 that constitutes the control gate electrical bias of field effect transistor Q1 is resistance R 1, R2 that two resistances that are in series equate; their resistance (nominal value) is 10K Ω; its serial connection point is dividing point 411, the free termination V of this resistance R 1 ₊, i.e. the electrode line 2 of Device Net bus 24V power supply, and the free end V_ of resistance R 2, i.e. the negative line 3 of 24V power supply, the source S of field effect transistor Q1 meets V _t, and drain D connects the voltage input end 11 of power IC 1, the control grid G connects dividing point 411; Diode 42 among the embodiment is IN5819 type diodes, and its positive pole connects the earth terminal 12 of power IC 1, and negative pole then connects V_, and promptly negative line 3.

As an alternative; field effect transistor protected location 41 can be substituted by a diode 43; promptly constitute second embodiment of the present utility model; see also shown in Figure 3; this enforcement comprises the 24V positive source line 2 of an anodal connection device bus and negative pole connects the diode 43 of the voltage input end 11 of power IC 1, with the anodal earth terminal 12 that is connected power IC 1 of another and the diode 42 of the negative line 3 of the 24V power supply of negative pole connection Device Net bus.

Claims

1, a kind of anti-power supply reversal connecting device of facility network communication interface, comprise interface+5V power IC (1), it is characterized in that, also have anti-power supply power supply reverse connecting protection parts (4), these power supply reverse connecting protection parts (4) are one four port part, and its two input is the 24V positive source line (2) and the negative line (3) of connection device network bus respectively; Its corresponding two output ports then connect the voltage input end (11) and the earth terminal (12) of this power IC (1) respectively.

2, the anti-power supply reversal connecting device of facility network communication interface according to claim 1; it is characterized in that; said anti-power supply reversal connection parts (4), it comprise the 24V positive source line (2) of a positive terminal connection device network bus and the field effect transistor protected location (41) of voltage input end (11) that negative pole end connects this power IC (1) with an anodal earth terminal (12) that is connected this power IC (1) and the diode (42) of the 24V power-polar curve (3) of negative pole connection device network bus.

3, the anti-power supply reversal connecting device of facility network communication interface according to claim 2; it is characterized in that; said field effect transistor protected location (41) is based on a N type field effect transistor Q1; the voltage input end (11) that the 24V positive source line (2) of its source S connection device network bus, drain D connect this power IC (1), the control grid G then connects the dividing point (411) of cross-over connection in the voltage divider (410) of the 24V of facility network bus positive source line (2), negative line (3).

4, the anti-power supply reversal connecting device of facility network communication interface according to claim 3 is characterized in that, said N type field effect transistor Q1 is an IRFD9120 type field effect transistor.

5, the anti-power supply reversal connecting device of facility network communication interface according to claim 3 is characterized in that, the resistance R 1 that said voltage divider (410) is equated by two resistances, R2 series connection constitute.

6, the anti-power supply reversal connecting device of facility network communication interface according to claim 5 is characterized in that, said resistance R 1, R2, and their resistance is 10K Ω.

7, the anti-power supply reversal connecting device of facility network communication interface according to claim 2 is characterized in that, said diode (42) is an IN5819 type diode.

8, the anti-power supply reversal connecting device of facility network communication interface according to claim 1; it is characterized in that; said power supply reverse connecting protection parts (4); it comprises the 24V positive source line (2) of an anodal connection device bus and negative pole connects the diode (43) of the voltage input end (11) of this power IC (1), with the anodal earth terminal (12) that is connected this power IC (1) of another and the diode (42) of the 24V power-polar curve (3) of negative pole connection device bus.