CN101083899B - Isolating safety grid - Google Patents
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- CN101083899B CN101083899B CN2007100432503A CN200710043250A CN101083899B CN 101083899 B CN101083899 B CN 101083899B CN 2007100432503 A CN2007100432503 A CN 2007100432503A CN 200710043250 A CN200710043250 A CN 200710043250A CN 101083899 B CN101083899 B CN 101083899B
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- 238000005516 engineering process Methods 0.000 description 3
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- 231100001261 hazardous Toxicity 0.000 description 2
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- 238000002955 isolation Methods 0.000 description 1
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Abstract
The present invention offers a kind of isolated safety barrier using the design of double sources redundancy power supply. Specifically, the electrical source, accepting double power inputs, connects with the power switch device to form a redundancy power supply circuit. The power switch device will automatically shift to the other power source in normal state if one of the power sources is invalid, therefore the isolated safety barrier can maintain a normal working state. Comparing to the isolated safety barrier using single power source, the present invention largely increases the credibility of isolated safety barriers.
Description
Technical field
The present invention relates to isolating safety grid, relate in particular to a kind of isolating safety grid with redundant power supply.
Background technology
Essential safety is that the electric flux that utilizes the guard grating technology will offer field instrument is limited in and can not produces the spark that is enough to ignite, and can not produce again in the safe range of the instrument surface temperature that is enough to ignite, thereby eliminate the explosion-proof method in ignition source.Essential safety has Ex (ia) and two grades of Ex (ib).IEC (International Electrotechnical Commission) regulation in the highest dangerous situation 0 district of degree of danger, can only adopt Ex (ia) grade intrinsic safe explosion-proof technology.Ex (ia) level essential safety instrument is in normal operation and when existing two faults in the circuit, and circuit element can not fire.In Ex (ia) type circuit, operating current is limited in below the 100mA, is applicable to 0 district, 1 district and 2 districts.Ex (ib) level essential safety instrument is in normal operation and when existing together fault in the circuit, circuit element does not fire fried.In Ex (ib) type circuit, operating current is limited in below the 150mA, is applicable to 1 district and 2 districts.
Existing Sefe antiexplosion system is made up of three parts: on-the-spot essential safety instrument, essential safety cable and essential safety associate device.On-the-spot essential safety instrument comprises the various one-time detection instrument that are installed in the hazardous area.The essential safety cable that with the two-wire system transducer is representative has special-purpose earth connection, distinguishes mutually with other cable with the pure blue of durability.The essential safety associate device comprises Zener type guard grating, isolating safety grid and other forms of protective device with current limliting, pressure limiting function.The energy limited that those associate devices can will be scurried into on-the-spot essential safety instrument in safety value, thereby guarantee the safety of field apparatus, personnel and production.
At present, modal associate device is a guard grating.Being connected to the circuit that on-the-spot essential safety instrument constituted from guard grating by the essential safety cable is intrinsically safe circuit; From the guard grating to DCS and to the circuit of power supply is immaterial safety circuit.It is installed in harbor, divides two kinds of Zener type guard grating (Zener grid) and isolating safety grids (isolated gate).
Isolating safety grid has intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, signal processing circuit and power circuit.See also Fig. 1, it is the partial circuit schematic diagram of existing isolating safety grid.The power input part of power circuit divides only accepts the input of single channel power supply.Promptly Shu Ru power positive end is connected directly to the power positive end of power circuit, and input power supply common port is connected directly to the power supply common port of power circuit.Isolating safety grid provides two input ports: power positive end input port and power supply common port input port.Because existing isolating safety grid only has single power supply, in case therefore this road power-fail just will directly cause accepting the isolating safety grid operation irregularity of this road power supply power supply or quitting work.
See also Fig. 2, it is the shape assumption diagram of existing isolating safety grid.See also Fig. 3, it installs and uses state diagram for existing isolating safety grid.The bottom 12 of isolating safety grid is used for being installed on the guide rail 13, and power end is positioned at the side 11 of its contour structures, and supply power mode adopts the terminal power supply, is about to power line and directly is connected on the power supply terminal of each isolating safety grid.Adopt this side to install and the terminal mode of power supply separately, wiring is many and complicated, is unfavorable for the intensive installation of isolating safety grid, and the powering on of engineering construction, installation etc. are brought inconvenience.
The MTL4000 of MTL company series isolating safety grid provides the dual power supply implementation, in this scheme, MTL4000 series isolating safety grid must cooperate motherboard (BACKPLANE) to use, with be connected by connector between the motherboard, look the different model of motherboard, the serial isolating safety grids of 4,8,16 or 24 MTL4000 that can peg graft on the motherboard.With regard to MTL4000 series isolating safety grid itself, its power unit is equally only accepted the input of single channel power supply; And its motherboard is supported the dual power supply redundancy power supply.The shortcoming of this scheme is, realize the redundant power supply of isolating safety grid by additional motherboard, needs to increase extra external accessory, not only increased cost, and this structure belongs to non-standard pattern, realizes complicatedly, is unfavorable for the intensive installation of isolating safety grid.
Summary of the invention
The object of the present invention is to provide a kind of isolating safety grid, only provide the input of single channel power supply in the prior art, when this circuit power lost efficacy, cause isolation type safety operation irregularity or out-of-work technical problem easily to solve.Another object of the present invention is to solve existing isolating safety grid and adopt the side terminal mode of connection, there is inconvenience in powering on and installing in the engineering construction, more will be unfavorable for the technical problem of the intensive installation of isolating safety grid after the increase redundant power supply function.
In order to achieve the above object, the invention discloses a kind of isolating safety grid, comprise intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, power end and signal processing circuit, power end comprises power input and the follow-up power circuit of supporting two-way power supply input at least, it also comprises power transfer device, wherein, described power transfer device is arranged between power input and the follow-up power circuit, be used for selecting wherein one road power supply input, to power to follow-up power circuit.
Support that the power input of two-way power supply input has at least 3 input ports at least, be respectively applied for the anode input and the common port input of two-way or the above power supply of two-way.
Power input is positioned at the isolating safety grid bottom, and wherein, the isolating safety grid bottom refers to the structure division of close installed surface in the isolating safety grid appearance structure.
Described power transfer device comprises at least two diodes, the anode of described each diode connects an input port that is used to receive the power positive end input, the negative electrode of all diodes connects the output of back as power transfer device, be connected to the power positive end of follow-up power circuit, the port number of input port that is used to receive the input of power supply common port is smaller or equal to the number of power supply, those input ports that are used to receive the input of power supply common port are connected to the power supply common port of follow-up power circuit after direct the connection again.
The port number that is used to receive the input port of power supply common port input can equal the number of power supply, i.e. each power supply common port input port of can pegging graft.All power supply common ports or part power supply common port can shared input ports.
Described power transfer device comprises at least two diodes, the anode of described each diode connects an input port that is used to receive the power positive end input, the negative electrode of all diodes connects the output of back as power transfer device, be connected to the power positive end of follow-up power circuit, the port number that is used to receive the input port of power supply common port input is 1, and this input port directly connects the power supply common port of follow-up power circuit.
Described power transfer device comprises at least two diodes, the negative electrode of described each diode connects an input port that is used to receive the input of power supply common port, the anode of described all diodes connects the output of back as power transfer device, be connected to the power supply common port of follow-up power circuit, the port number of input port that is used to receive the power positive end input is smaller or equal to the number of power supply, those input ports that are used to receive the power positive end input are connected to the power positive end of follow-up power circuit after direct the connection again.
The port number that is used to receive the input port of power positive end input can equal the number of power supply, i.e. each power positive end input port of can pegging graft.Certainly, all power positive ends or part power positive end can shared input ports.
Described power transfer device comprises at least two diodes, the negative electrode of described each diode connects one and is used to receive the input port that the power supply common port is imported, the anode of described all diodes connects the output of back as power transfer device, be connected to the power supply common port of follow-up power circuit, the port number that is used to receive the input port of power positive end input is 1, and this input port that is used to receive the power positive end input is connected directly to the power positive end of follow-up power circuit.
Described power transfer device comprises power positive end side processing electronic circuit and the public distolateral processing electronic circuit of power supply, described power positive end side is handled electronic circuit and is comprised at least two diodes, the anode of described each diode connects an input port that is used to receive the power positive end input, the negative electrode of all diodes connects the output of back as power transfer device, be connected to the power positive end of follow-up power circuit, the public distolateral processing electronic circuit of power supply also comprises at least two diodes, the negative electrode of described each diode connects one and is used to receive the input port that the power supply common port is imported, the anode of described all diodes connects the output of back as power transfer device, is connected to the power supply common port of follow-up power circuit.
Compared with prior art, isolating safety grid provided by the invention has the function of redundant power supply, has an enormous advantage with respect to the isolating safety grid tool of traditional single power supply.When in case the working power of input lost efficacy, power transfer device will automatically switch and use the power supply of other operate as normal, thereby guarantee that this isolating safety grid can keep normal operating conditions, thereby the present invention greatly improved the degree of reliability of isolating safety grid, adopts the mode of bottom power supply to be beneficial to powering on and intensive installation in the engineering construction.
And, compare with the dual power supply implementation of the MTL4000 of MTL company series isolating safety grid, the present invention has realized redundant power supply in the body of isolating safety grid, need not the similar external accessory of cooperation in addition and MTL4000 series isolating safety grid motherboard (BACKPLANE) and realize redundant power supply, when reducing cost, install easylier, more help the intensive installation of isolating safety grid.
Description of drawings
Fig. 1 is the part power circuit schematic diagram of existing isolating safety grid;
Fig. 2 is the shape assumption diagram of existing isolating safety grid;
Fig. 3 is the state diagram of installing and using of existing isolating safety grid;
Fig. 4 is the schematic diagram of the isolating safety grid first embodiment part power circuit of the present invention;
Fig. 5 is the schematic diagram of the isolating safety grid second embodiment part power circuit of the present invention;
Fig. 6 is the schematic diagram of isolating safety grid the 3rd embodiment part power circuit of the present invention;
Fig. 7 is the schematic diagram of isolating safety grid the 4th embodiment part power circuit of the present invention;
Fig. 8 is the schematic diagram of isolating safety grid the 5th embodiment part power circuit of the present invention;
Fig. 9 is an application circuit of isolating safety grid of the present invention;
Figure 10 is the shape assumption diagram of isolating safety grid of the present invention;
Figure 11 is the state diagram of installing and using of isolating safety grid of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
Guard grating is the associate device that connects intrinsic safety equipment and non-intrinsic safety equipment in the intrinsic safety system, realizes the explosion-proof of hazardous area equipment.Therefore the special safety effect of guard grating, need especially pay attention to the safety problem of guard grating just.Find that through long-term practice the isolating safety grid of at present traditional single power supply exists the huge potential safety hazard that industry technical staff does not pay attention to always.And adopting the side terminal mode of power supply separately, the wiring complexity is unfavorable for powering on and installing of engineering construction.For this reason, invented the isolating safety grid of the bottom supply power mode both practical, that reliability is high and easy for installation after deliberation with redundancy feature.
The invention provides a kind of isolating safety grid, comprise intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, power end and signal processing circuit, power end comprises power input and the follow-up power circuit of supporting two-way power supply input at least, it also comprises power transfer device, wherein, described power transfer device is arranged between power input and the follow-up power circuit, be used for selecting wherein one road power supply input, to power to follow-up power circuit, especially if the power supply that uses other road normal power supply is then switched in the power-fail of powering.Wherein power input is positioned at the isolating safety grid bottom, and wherein, the isolating safety grid bottom refers to the structure division of close installed surface in the isolating safety grid appearance structure.
Be to have the shape assumption diagram of isolating safety grid now and install and use state diagram as shown in Figures 2 and 3.The DIN guide rail mounting means of standard is generally adopted in the installation of existing isolating safety grid.Close installed surface partly is the bottom of the guard grating of general common name with the guide rail contacting structure promptly in the isolating safety grid appearance structure, and the structural plane with the guide rail parallel sided in the appearance structure is the side of the guard grating of general common name.Adopt its power supply terminal of guard grating of the independent supply power mode of side terminal to be positioned at the side of guard grating, power line directly is connected on the side power supply terminal of each guard grating, and wiring is many and complicated, and installation, wiring, engineering construction such as power on are all inconvenient.And the present invention is arranged on the isolating safety grid bottom with power input, helps powering on and intensive installation in the engineering construction.
Isolating safety grid of the present invention is accepted double loop power supply input usually, certainly, if the needs of some special occasions, also can isolating safety grid be set to accept three the road or more multiple power supplies input, all should drop in protection scope of the present invention.Because its principle is similar, the present invention is follow-up to illustrate that with regard to double loop power supply input this has the isolating safety grid of redundant power supply feature.
See also Fig. 4, it is for the schematic diagram of the isolating safety grid first embodiment part power circuit of the present invention.In the present embodiment, described power input has port one, port 2 and port 3 totally 3 ports, is respectively applied for the anode input and the common port input of two-way power supply.Port one connects the anode of external power source 1, and port 2 connects the anode of external power source 2, and port 3 connects the common port of external power source 1 and external power source 2.Described power transfer device comprises the first diode D1 and the second diode D2,1 back, anode connectivity port of the described first diode D1 is connected with the anode of external power source 1,2 backs, anode connectivity port of the described second diode D2 are connected with the anode of external power source 2, output as power transfer device after the negative electrode of the described first diode D1 and the second diode D2 is connected is connected with the power positive end of follow-up power circuit, and 3 backs, power supply common port connectivity port of follow-up power circuit are connected with the common port of external power source 1 with external power source 2.
The redundant power supply circuit working principle of the described isolating safety grid of present embodiment is described in detail as follows.When external power source 1 and external power source 2 all are in normal condition, the first diode D1 and the second diode D2 have at least 1 to be in the forward conduction state, be assumed to the first diode D1 and be in conducting state, then external power source 1 continuous backward then power circuit after producing a forward conduction voltage drop on the first diode D1 of forward conduction is powered, and guarantees this isolating safety grid operate as normal.Externally power supply 2 continues to be under the situation of normal condition, when external power source 1 lost efficacy (supply power voltage decline, power supply short circuit or electric power disconnection etc.) for a certain reason, power transfer device can automatically switch on the external power source of another road operate as normal and guarantee the isolating safety grid operate as normal.When descending as supply power voltage when external power source 1, in the moment that its supply power voltage begins to fall, the first diode D1 still is in the forward conduction state, for the common port (being port 3) of external power source 1 and external power source 2, because anode (the being port one) voltage of the external power source 1 that the first diode D1 anode is connected begins to descend, must cause the voltage (also being the voltage of the second diode D2 negative electrode) of the first diode D1 negative electrode to follow decline.When the first diode D1 cathode voltage (also being the voltage of the second diode D2 negative electrode) drops to a certain degree, when causing the pressure reduction of anode (the being port 2) voltage of the external power source 2 that the second diode D2 anode connected and the second diode D2 cathode voltage to reach the threshold voltage that makes the second diode D2 forward conduction, the second diode D2 is with forward conduction, external power source 2 will be powered by continuous backward then power circuit after producing a forward conduction voltage drop on the second diode D2 of forward conduction this moment, guarantee that this isolating safety grid can continue operate as normal.
When causing external power source 1 short circuit for a certain reason or opening circuit, this moment, the second diode D2 was with conducting, the shared common port (being port 3) of common port, external power source 1 and the external power source 2 of the anode of external power source 2 (being port 2), the second diode D2, the power positive end of follow-up power circuit, follow-up power circuit constitutes a closed-loop path, and isolating safety grid continues operate as normal.
See also Fig. 5, it is for the schematic diagram of the isolating safety grid second embodiment partial circuit of the present invention.Be that with the first embodiment difference power input comprises port one, port 2, port 3 and port 4 totally 4 input ports.The common port of external power source 1 is connected with port 3, and the common port of external power source 2 is connected with port 4, port 3 and the power supply common port that is connected to follow-up power circuit after port 4 is connected.
The isolating safety grid of second embodiment is identical with the operation principle of first embodiment.
See also Fig. 6, it is for the schematic diagram of isolating safety grid the 3rd embodiment partial circuit of the present invention.Described power input has port one, port 2 and port 3 totally 3 ports, is respectively applied for the anode input and the common port input of two-way power supply.Port one connects the anode of external power source 1 and external power source 2, and port 2 connects the common port of external power source 1, and port 3 connects the common port of external power source 2.Described power transfer device comprises the first diode D1 and the second diode D2.The cathode connection terminal mouth 2 of the described first diode D1 links to each other with the common port of external power source 1, the cathode connection terminal mouth 3 of the second diode D2 links to each other with the common port of external power source 2, and the anode of the described first diode D1 and the second diode D2 is connected the back and links to each other with the power supply common port of follow-up power circuit.The anode of follow-up power circuit is connected with port 3 with the anode of external power source 1 with external power source 2 and links to each other.When external power source 1 and external power source 2 all are in normal condition, the first diode D1 and the second diode D2 have at least 1 to be in the forward conduction state, be assumed to the first diode D1 and be in conducting state, then the common port of the power positive end of the anode of external power source 1 and external power source 2 (being port one), follow-up power circuit, the first diode D1, external power source 1 (being port 2) constitutes a closed-loop path, guarantees the isolating safety grid operate as normal.Externally power supply 2 continues to be under the situation of normal condition, and when external power source 1 lost efficacy (as supply power voltage decline, power supply short circuit or electric power disconnection etc.) for a certain reason, power transfer device will automatically switch to external power source 2.As when the common port voltage lifting of external power source 1, begin the moment of lifting at it, the first diode D1 still is in the forward conduction state, for the anode of external power source 1 and external power source 2, because the common port voltage of the external power source 1 that the first diode D1 negative electrode is connected begins lifting, must cause the voltage (also being the voltage of the second diode D2 anode) of the first diode D1 anode to follow lifting.When the first diode D1 anode voltage (also being the voltage of the second diode D2 anode) is lifted to a certain degree, when causing the pressure reduction of the common port voltage of the external power source 2 that the second diode D2 anode voltage is connected with the second diode D2 negative electrode to reach the threshold voltage that makes the second diode D2 forward conduction, the second diode D2 is with forward conduction, the common port of the power positive end of the anode of external power source 2, follow-up power circuit, the second diode D2, external power source 2 constitutes a closed-loop path at this moment, guarantees that this isolating safety grid can continue operate as normal.
When causing external power source 1 short circuit for a certain reason or opening circuit, this moment, the second diode D2 was with conducting, the common port of the anode of external power source 1 and external power source 2 (being port one), the second diode D2, the power positive end of follow-up power circuit, follow-up power circuit, the shared common port of external power source 2 (being port 3) constitute a closed-loop path, and isolating safety grid continues operate as normal.
See also Fig. 7, it is for the schematic diagram of isolating safety grid the 4th embodiment partial circuit of the present invention.
Be that with the 3rd embodiment difference power input comprises port one, port 2, port 3 and port 4 totally 4 input ports, be respectively applied for the anode input and the common port input of external power source.The anode of external power source 1 is connected with port one, and the anode of external power source 2 is connected with port 2, port one and the power positive end that is connected to follow-up power circuit after port 2 is connected.
Because the 4th embodiment is similar with the operation principle of the 3rd embodiment, just no longer be described in detail at this.
See also Fig. 8, it is for the schematic diagram of isolating safety grid the 5th embodiment partial circuit of the present invention.Described power input comprises port one, port 2, port 3 and port 4 totally 4 ports, is respectively applied for the anode input and the common port input of two-way external power source.Port one connects the anode of external power source 1, and port 2 connects the anode of external power source 2.Port 3 connects the common port of external power source 1, and port 4 connects the common port of external power source 2.Described power transfer device comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.The anode connectivity port 1 of the described first diode D1 links to each other with the anode of external power source 1, the anode connectivity port 2 of the described second diode D2 links to each other with the anode of external power source 2, and the negative electrode of the described first diode D1 and the second diode D2 is connected the back and is connected with the power positive end of follow-up power circuit.The cathode connection terminal mouth 3 of described the 3rd diode D3 links to each other with the common port of external power source 1, the cathode connection terminal mouth 4 of described the 4th diode D4 is connected with the common port of external power source 2, and the anode of described the 3rd diode D3 and the 4th diode D4 is connected the back and links to each other with the power supply common port of follow-up power circuit.
Because the 5th embodiment is similar to the operation principle of first and third embodiment, just no longer be described in detail at this.
Need to prove, when power transfer device of the present invention has adopted the simplest diode components and parts to realize that power supply lost efficacy, switch the effect of the power supply that uses other road normal power supply.But the present invention is not limited to diode element, and the circuit that can adopt other components and parts (diode can substitute with triode or MOSFET field effect transistor) or other components and parts to form is realized the function of power transfer device.But the present invention adopts the diode components and parts to realize the function of power transfer device, realizes simple and convenient, with low cost.
The present invention, should drop in protection scope of the present invention as long as adopt the design of redundance type power supply disclosed by the invention no matter be the isolating safety grid of which kind of type or model.For this reason, the present invention is that application examples illustrates the present invention especially exemplified by an isolating safety grid.
See also Fig. 9, it is for using the circuit diagram of isolating safety grid of the present invention.The present invention can set up before the follow-up power circuit of isolating safety grid as Fig. 4 to power input and power transfer device shown in Figure 8, isolating safety grid after this improvement has the function of redundant power supply, has an enormous advantage with respect to the isolating safety grid tool of traditional single power supply.In case when the working power of input lost efficacy, power transfer device will automatically switch and use the power supply of other operate as normal, thereby guarantee that this isolating safety grid can keep normal operating conditions, thereby the present invention has greatly improved the degree of reliability of isolating safety grid.
Figure 10 is with the shape assumption diagram that Figure 11 shows that isolating safety grid of the present invention and install and use state diagram.Power input is positioned at the bottom of isolating safety grid, and guard grating vertically is installed on the standard DIN guide rail side by side, and power input is connected to each other between the adjacent isolating safety grid.Therefore when wiring powers on, do not need each isolated gate is carried out independent wiring power supply, only need external power cord is connected to the bottom power input of outermost end guard grating, because each guard grating power input is connected to each other, so can realize power supply easily to all guard gratings of guide rail, need not other lead wiring.Installation powers on conveniently, has saved cost.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (5)
1. isolating safety grid, comprise intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, power end and signal processing circuit, it is characterized in that, power end comprises power input and the follow-up power circuit of supporting two-way power supply input at least, it also comprises power transfer device, and wherein, described power transfer device is arranged between power input and the follow-up power circuit, be used for selecting wherein one road power supply input, to power to follow-up power circuit;
Support the power input of two-way power supply input at least to be arranged at the isolating safety grid bottom, wherein, the isolating safety grid bottom is the structure division of close installed surface in the isolating safety grid appearance structure;
Isolating safety grid vertically is installed on the standard DIN guide rail side by side, and power input is connected to each other between the adjacent isolating safety grid;
And each isolating safety grid supports that the power input of two-way power supply input has at least 3 input ports at least, be respectively applied for the anode input and the common port input of two-way or the above power supply of two-way, the power transfer device of each isolating safety grid comprises that the power positive end side handles at least a in electronic circuit and the public distolateral processing electronic circuit of power supply, described power positive end side is handled electronic circuit and is comprised at least two diodes, the anode of described each diode connects an input port that is used to receive the power positive end input, the negative electrode of all diodes connects the output of back as power transfer device, be connected to the power positive end of follow-up power circuit, the public distolateral processing electronic circuit of power supply also comprises at least two diodes, the negative electrode of described each diode connects one and is used to receive the input port that the power supply common port is imported, the anode of described all diodes connects the output of back as power transfer device, is connected to the power supply common port of follow-up power circuit.
2. isolating safety grid, comprise intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, power end and signal processing circuit, it is characterized in that, power end comprises power input and the follow-up power circuit of supporting two-way power supply input at least, it also comprises power transfer device, and wherein, described power transfer device is arranged between power input and the follow-up power circuit, be used for selecting wherein one road power supply input, to power to follow-up power circuit;
Support the power input of two-way power supply input at least to be arranged at the isolating safety grid bottom, wherein, the isolating safety grid bottom is the structure division of close installed surface in the isolating safety grid appearance structure;
Isolating safety grid vertically is installed on the standard DIN guide rail side by side, and power input is connected to each other between the adjacent isolating safety grid;
And each isolating safety grid supports that the power input of two-way power supply input has at least 3 input ports at least, be respectively applied for the anode input and the common port input of two-way or the above power supply of two-way, the power transfer device of each isolating safety grid comprises at least two diodes, the anode of described each diode connects an input port that is used to receive the power positive end input, the negative electrode of all diodes connects the output of back as power transfer device, be connected to the power positive end of follow-up power circuit, the port number of input port that is used to receive the input of power supply common port is smaller or equal to the number of power supply, those input ports that are used to receive the input of power supply common port are connected to the power supply common port of follow-up power circuit after direct the connection again.
3. isolating safety grid, comprise intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, power end and signal processing circuit, it is characterized in that, power end comprises power input and the follow-up power circuit of supporting two-way power supply input at least, it also comprises power transfer device, and wherein, described power transfer device is arranged between power input and the follow-up power circuit, be used for selecting wherein one road power supply input, to power to follow-up power circuit;
Support the power input of two-way power supply input at least to be arranged at the isolating safety grid bottom, wherein, the isolating safety grid bottom is the structure division of close installed surface in the isolating safety grid appearance structure;
Isolating safety grid vertically is installed on the standard DIN guide rail side by side, and power input is connected to each other between the adjacent isolating safety grid;
And each isolating safety grid supports that the power input of two-way power supply input has at least 3 input ports at least, be respectively applied for the anode input and the common port input of two-way or the above power supply of two-way, the power transfer device of each isolating safety grid comprises at least two diodes, the anode of described each diode connects an input port that is used to receive the power positive end input, the negative electrode of all diodes connects the output of back as power transfer device, be connected to the power positive end of follow-up power circuit, the port number that is used to receive the input port of power supply common port input is 1, and this input port directly connects the power supply common port of follow-up power circuit.
4. isolating safety grid, comprise intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, power end and signal processing circuit, it is characterized in that, power end comprises power input and the follow-up power circuit of supporting two-way power supply input at least, it also comprises power transfer device, and wherein, described power transfer device is arranged between power input and the follow-up power circuit, be used for selecting wherein one road power supply input, to power to follow-up power circuit;
Support the power input of two-way power supply input at least to be arranged at the isolating safety grid bottom, wherein, the isolating safety grid bottom is the structure division of close installed surface in the isolating safety grid appearance structure;
Isolating safety grid vertically is installed on the standard DIN guide rail side by side, and power input is connected to each other between the adjacent isolating safety grid;
And each isolating safety grid supports that the power input of two-way power supply input has at least 3 input ports at least, be respectively applied for the anode input and the common port input of two-way or the above power supply of two-way, the power transfer device of each isolating safety grid comprises at least two diodes, the negative electrode of described each diode connects an input port that is used to receive the input of power supply common port, the anode of described all diodes connects the output of back as power transfer device, be connected to the power supply common port of follow-up power circuit, the port number of input port that is used to receive the power positive end input is smaller or equal to the number of power supply, those input ports that are used to receive the power positive end input are connected to the power positive end of follow-up power circuit after direct the connection again.
5. isolating safety grid, comprise intrinsic safety side signal input output end, non-intrinsic safety side signal input output end, power end and signal processing circuit, it is characterized in that, power end comprises power input and the follow-up power circuit of supporting two-way power supply input at least, it also comprises power transfer device, and wherein, described power transfer device is arranged between power input and the follow-up power circuit, be used for selecting wherein one road power supply input, to power to follow-up power circuit;
Support the power input of two-way power supply input at least to be arranged at the isolating safety grid bottom, wherein, the isolating safety grid bottom is the structure division of close installed surface in the isolating safety grid appearance structure;
Isolating safety grid vertically is installed on the standard DIN guide rail side by side, and power input is connected to each other between the adjacent isolating safety grid;
And each isolating safety grid supports that the power input of two-way power supply input has at least 3 input ports at least, be respectively applied for the anode input and the common port input of two-way or the above power supply of two-way, the power transfer device of each isolating safety grid comprises at least two diodes, the negative electrode of described each diode connects one and is used to receive the input port that the power supply common port is imported, the anode of described all diodes connects the output of back as power transfer device, be connected to the power supply common port of follow-up power circuit, the port number that is used to receive the input port of power positive end input is 1, and this input port that is used to receive the power positive end input is connected directly to the power positive end of follow-up power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100432503A CN101083899B (en) | 2007-06-29 | 2007-06-29 | Isolating safety grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100432503A CN101083899B (en) | 2007-06-29 | 2007-06-29 | Isolating safety grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101083899A CN101083899A (en) | 2007-12-05 |
| CN101083899B true CN101083899B (en) | 2011-05-11 |
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ID=38913091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100432503A Expired - Fee Related CN101083899B (en) | 2007-06-29 | 2007-06-29 | Isolating safety grid |
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| Country | Link |
|---|---|
| CN (1) | CN101083899B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203290U (en) * | 1985-08-14 | 1986-04-30 | 国营738厂3所 | Safety grid for mine |
| CN1983761A (en) * | 2006-05-29 | 2007-06-20 | 华为技术有限公司 | Controller for switching main power supply |
-
2007
- 2007-06-29 CN CN2007100432503A patent/CN101083899B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203290U (en) * | 1985-08-14 | 1986-04-30 | 国营738厂3所 | Safety grid for mine |
| CN1983761A (en) * | 2006-05-29 | 2007-06-20 | 华为技术有限公司 | Controller for switching main power supply |
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| Publication number | Publication date |
|---|---|
| CN101083899A (en) | 2007-12-05 |
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