CN103076785B - Hot plug control device for Ethernet switch and industrial Ethernet switch - Google Patents
Hot plug control device for Ethernet switch and industrial Ethernet switch Download PDFInfo
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- CN103076785B CN103076785B CN201210592862.9A CN201210592862A CN103076785B CN 103076785 B CN103076785 B CN 103076785B CN 201210592862 A CN201210592862 A CN 201210592862A CN 103076785 B CN103076785 B CN 103076785B
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Abstract
The invention provides a hot plug control device for an industrial Ethernet switch, which is located at a back plate of the industrial Ethernet switch, and is connected between a back plate power supply bus and a business printed circuit board circuit. The hot plug control device comprises an input start control module, an output start control loop, an output control loop and a power conversion module, wherein the input start control module is used for cutting the power supply of the back plate power supply bus before splicing the business printed circuit board and connecting the power supply of the back plate power supply bus after splicing; the output start control loop is used for acquiring loop circuit from the business printed circuit board circuit to the back plate power supply bus in the starting phase of the power supply, and feeding back the loop circuit to the power conversion module; the output control loop is used for acquiring the voltage of the business printed circuit board circuit output by the power conversion module after the starting phase is ended, and feeding the voltage back to the power conversion module; and the power conversion module is used for adjusting the starting current and output voltage of the back plate power supply bus according to the received fed back current and voltage, so as to avoid electrical sparks when the business printed circuit board is spliced. The hot plug control device provided by the invention ensures that no potential electrical spark risks exist for the switch when the hot plug operation is carried out on the business printed circuit board under the mine.
Description
Technical field
The present invention relates to the communications field, particularly a kind of hot plug control device for industrial ethernet switch and industrial ethernet switch.
Background technology
In industrial communication systems, due to the needs of Real Data Exchangs, can not power-off for General Requirements system communication system, just create the problem of some device element hot line jobs in this case.
As shown in Figure 1, be the basic electric power-feeding structure schematic diagram of a kind of communication facilities of the prior art.Multiple business board cartoon is crossed dedicated slot and is plugged in backboard (or claiming mainboard, motherboard), and power supply is powered to each business board being plugged on backboard by the 48V bus of backboard.
As mentioned above, in industrial communication systems, due to the needs of Real Data Exchangs, can not power-off for General Requirements system communication system, in the process of each business board like this on installation and removal backboard, power supply just can not be interrupted the power supply of other business boards by backboard, just carries out the hot plug technology of business board installation and removal under needing exploitation can meet not powering-off state here.
What hot plug referred to is exactly equipment operator is when without power-off, and each board on direct plug equipment, namely in plug Fig. 1 during each business board, backboard 48V bus can not power-off, in order to avoid affect the work of other business boards.But when not protecting, hot plug can produce transient voltage spike, damages the device on business board and/or backboard, produces instantaneous large-current simultaneously, if voltage is at more than 10V, tens amperes, electric current, will produce electric spark, causes damage to connector (as slot), in certain applications, such as mine, refinery etc., electric spark more can cause the accidents such as blast.
Electric spark Producing reason is: when plugging, two will in conjunction with or the terminal that separates, can in the moment that will contact or be separated and when contact is very little, produce electric discharge, reason is containing a small amount of negative ions in gas, under the effect of applied voltage, and ion accelerated motion, ion populations increases greatly in an impact, and the directed movement in the electric field of these ions just forms electric current.Electric current by during gas along with strong heating process so that the neutral gas molecule in current channel is ionized and forms plasma.
General communication applications now, mainly contains the problem that two kinds of methods solve the generation of electrical equipment spark.Its core concept is, increases the electric current that loop circuit impedance limits powered on moment, and in swapping process, the electric current of powered on moment is larger, so when following analysis, only analyzes problem when powering on.
The first scheme: resistance in series R1 in the loop, increases loop circuit impedance, reduces electric current.
As shown in Figure 2, the plug connector between backboard and business board is positioned at a side electric capacity C in parallel of backboard
1, at grafting electric capacity C in parallel between business board side with business board circuit
2, and at business board circuit and electric capacity C
2way circuit on to connect an electric capacity R
1.
Its principle is: before powering on, before namely in Fig. 2, connector is connected, and electric capacity C
1in voltage be V
c1, electric capacity C
2in voltage be V
c2=0.In the moment that connector is connected, loop current I=I
1+ I
2, because V
c2be zero, so ignore electric current I at powered on moment
2, so there is following relation
I＝I
1＝(V
C1-V
C2)/R
1 (1)
In Fig. 2, if there is no R
1or R
1very little, electric current I can be easy to reach tens amperes, and then produces electric spark.The common voltage of communicator is 48V, if resistance R
1resistance value is 4.8 more than Ω, just can current limit at below 10A, to ensure the safety that powers on.
The shortcoming of the first scheme is, the resistance R in loop
1meeting consumed power always, Ploss=I
2r, such as, when mainboard power is comparatively large, in loop, electric current is 10A, R
1the power of upper consumption will be Ploss=100 × 4.8=480W.Due to each side, so large power dissipation is at R
1on be unacceptable.
First scheme, as shown in Figure 3, on the basis of Fig. 2, by resistance R
1change MOS (Metal Oxide Semiconductor, metal-oxide semiconductor (MOS)) pipe Q into
1.According to the characteristic of metal-oxide-semiconductor, when its GS voltage (gate source voltage) is less than cut-in voltage, its DS (Drain-Source) characteristic presents variable resistance characteristics, and during higher than cut-in voltage, DS presents constant-resistance, and very little, in milliohm level.By applying Control of Voltage to its grid, can be implemented in powers on starts to be allow the DS of metal-oxide-semiconductor present large resistance characteristic, and limit the electric current that initially powers on, after having powered on, between DS, resistance almost can be ignored, and so just solves resistance R in Fig. 2
1the problem that power consumption is large.
First scheme can well solve the Power Supply Hot Swap problem in general application scenario, and not only circuit is simple, and effect is also fine.But in industrial applications, under such as coal mine, the contour dangerous situation of refinery, because the dangerous substance in connector ambient gas is a lot, the method for this only rough Limited Current, is not enough to accomplish reliable completely.
Summary of the invention
In view of this, the invention provides a kind of hot plug control device for industrial ethernet switch, during to guarantee that switch carries out hot plug operations to business board card, do not produce potential electric spark hazard.
The technical scheme of the application is achieved in that
A kind of industrial ethernet switch hot plug control device, is electrically connected between the backboard power supply buses of described industrial ethernet switch and business board circuit, described hot plug control device comprises input and starts control module, output control circuit and power conversion module, the input end that described input starts control module is electrically connected with described backboard power supply buses, the input end of described power conversion module is electrically connected with the output terminal of described startup control module, the output terminal of described power conversion module is electrically connected with described business board circuit by the plug connector being positioned at described backboard, the input end of described output control circuit is electrically connected with the output terminal of described power conversion module, the output terminal of described output control circuit is electrically connected with the feedback reception end of described power conversion module, wherein,
Described input starts the electrical connection that control module is used for cutting off when being in not-connected status between described business board and described plug connector between described backboard power supply buses and described plug connector, and connects the electrical connection between described backboard power supply buses and described plug connector when described business board and described plug connector are in connection status;
The curtage that described output control circuit exports to described business board circuit for gathering described power conversion module, and feed back to the feedback reception end of described power conversion module;
Described power conversion module is used for the feedback current received according to its feedback reception end, adjusts, be less than to make the current value of backboard power supply buses electric current the current value producing electric spark to the electric current of the backboard power supply buses that its input end receives.
Further:
Described output control circuit comprises output voltage sampling module and the first feedback module, the input end of described output voltage sampling module is electrically connected with the output terminal of described power conversion module, the input end of described first feedback module is electrically connected with the output terminal of described output voltage sampling module, and the output terminal of described first feedback module is electrically connected with the feedback reception end of described power conversion module; Wherein,
The voltage that described output voltage sampling module exports to described business board circuit for gathering described power conversion module;
Described first feedback module is used for the sampled result according to described output voltage sampling module, controls described power conversion module and is operated in voltage stabilizing state.
Further:
Described hot plug control device also comprises output and starts control loop and feedback switching gauge tap, the described input end starting control loop that exports is electrically connected with the loop between described business board circuit to backboard power supply buses, described output starts the output terminal of control loop and is electrically connected with the feedback reception end of described power conversion module, described feedback switches gauge tap and is electrically connected between described output control circuit and power conversion module, and described feedback switching gauge tap is also electrically connected with the described control end starting control loop that exports; Wherein,
Described export start control loop be used for described backboard power supply buses to business board circuit power unloading phase, gather the loop current between described business board circuit to backboard power supply buses and feed back to the feedback reception end of described power conversion module, meanwhile switching gauge tap by described feedback and cut off the circuit of described output control circuit to described power conversion module; Described power supply unloading phase terminate after, stop the loop current gathering between described business board circuit to backboard power supply buses also to connect the circuit of described output control circuit to described power conversion module by described feedback switching gauge tap;
Described feedback switches gauge tap and is used for exporting according to described the control starting control loop, cuts off or connect the circuit of described output control circuit to described power conversion module.
Further:
Described output starts control loop and comprises loop current sampling module and the second feedback module, the input end of described loop current sampling module is electrically connected with the loop between described business board circuit to backboard power supply buses, the input end of described second feedback module is electrically connected with the output terminal of described loop current sampling module, the output terminal of described second feedback module is electrically connected with described power conversion module, and the control end of described second feedback module switches gauge tap be electrically connected with described feedback; Wherein,
Described loop current sampling module be used for described backboard power supply buses to business board circuit power unloading phase, gather the loop current between described business board circuit to backboard power supply buses; Described power supply unloading phase terminate after, stop gathering the loop current between described business board circuit to backboard power supply buses;
Described second feedback module be used for described backboard power supply buses to business board circuit power unloading phase, the current feedback gathered by described loop current sampling module gives the feedback reception end of described power conversion module, meanwhile switches gauge tap by described feedback and cuts off the circuit of described output control circuit to described power conversion module; Described power supply unloading phase terminate after, stop feeding back to the feedback reception end of described power conversion module the electric current that described loop current sampling module gathers, and connect the circuit of described output control circuit to described power conversion module by described feedback switching gauge tap.
Further, described input startup control module comprises an electrochemical capacitor, a resistance, a relay, one first diode and one second diode; Wherein,
The positive terminal of described electrochemical capacitor is electrically connected with described backboard power supply buses, the negative pole end ground connection of described electrochemical capacitor;
One end of described resistance is electrically connected with a 12V supply voltage;
The moving contact of described relay is electrically connected with described backboard power supply buses, the normally opened contact of described relay is electrically connected with the input end of described power conversion module, and then be electrically connected with the plug connector being positioned at described backboard, to be electrically connected with described business board circuit by described plug connector, the controlled contact of coil first of described relay is electrically connected with the other end of described resistance, the controlled contact of coil second of described relay is electrically connected with the business board contact pin in described plug connector, and then when described business board is plugged in described plug connector, the coil generation current of described relay is connected with the moving contact and normally opened contact that make described relay, and then connect the circuit of described backboard power supply buses to described business board,
The positive terminal of described first diode and the second diode is all electrically connected with the business board contact pin in described plug connector, and the negative pole end of described first diode and the second diode is all electrically connected with the other end of described resistance.
Further, described hot plug control device also comprises:
Input rectifying filtration module, is connected between described backboard power supply buses and power conversion module, carries out rectifying and wave-filtering for the electric current inputted to described power conversion module described backboard power supply buses.
Further, it is characterized in that, described hot plug control device also comprises:
Output rectification filter module, is connected between described power conversion module and business board circuit, carries out rectifying and wave-filtering for the electric current exported to described business board circuit described power conversion module.
Further, described hot plug control device also comprises:
Duty ratio adjusting circuit, is electrically connected with the feedback reception end of described power conversion module, and the feedback current feeding back to described power conversion module for described output control circuit and output being started control loop carries out duty cycle adjustment.
Further:
Described output starts control loop and comprises electric capacity C1, electric capacity C2, transformer T3, resistance R71, electric capacity C31, diode D17, electric capacity C361, resistance R73, resistance R78, operational amplifier A R1, resistance R82, electric capacity C363, electric capacity C364, resistance R79, electric capacity C362, optocoupler PC1 and resistance R80;
The negative pole end of described electric capacity C1 is electrically connected with primary coil one end of described transformer T3, and with the power supply of described backboard be electrically connected, the positive terminal of electric capacity C1 is electrically connected with the positive output end of backboard power supply; The negative pole end of described electric capacity C2 is electrically connected with the primary coil former limit Same Name of Ends of described transformer T3, and with the power supply of described business board be electrically connected, the positive pole termination of electric capacity C2 is electrically connected with the positive input anode of business board power supply; One end of the secondary coil of described transformer T3 is electrically connected with one end of resistance R71, electric capacity C31 and electric capacity C361, and ground connection; The secondary Same Name of Ends of the secondary coil of described transformer T3 is electrically connected with the other end of resistance R71 and electric capacity C31, and is electrically connected with the positive terminal of diode D17; The negative-phase input of described operational amplifier A R1 is electrically connected with the other end of the negative pole end of diode D17 and electric capacity C361, and is electrically connected with one end of resistance R82 and electric capacity C364; The normal phase input end of described operational amplifier A R1 is electrically connected with one end of resistance R73 and resistance R78; Another termination 1.24V supply voltage of described resistance R73, the other end ground connection of described resistance R78; The other end of described resistance R82 is electrically connected with one end of electric capacity C363; The output terminal of described operational amplifier A R1 is electrically connected with the other end of electric capacity C364 and electric capacity C363, and is connected with the negative electricity of light emitting diode in optocoupler PC1; The VCC pin of operational amplifier A R1 is electrically connected with one end of resistance R79 and electric capacity 362, and connects 12V supply voltage; The GND pin ground connection of described operational amplifier A R1; The other end ground connection of described electric capacity 362; In photoelectrical coupler PC1, the positive pole of light emitting diode is electrically connected with the other end of resistance R79; The grounded emitter of phototriode in described photoelectrical coupler PC1, in photoelectrical coupler PC1, the collector of phototriode is electrically connected with one end of resistance R80, and the other end of resistance R80 is electrically connected with PWM control pin; Wherein, described PWM control pin is electrically connected with duty cycle adjustment module.
A kind of industrial ethernet switch, comprise backboard, power supply and at least 1 business board, described business board is plugged in described backboard, described power supply is powered to each business board being plugged in described backboard by the bus of described backboard, corresponds to business board described in each and be all connected with an industrial ethernet switch hot plug control device as above described in any one in the bus of described backboard.
As can be seen from such scheme, industrial ethernet switch hot plug control device of the present invention is due to comprised startup control module and then can ensure that subcard is in access moment, the supply voltage of backboard power supply buses is started from scratch, compared to traditional approach, fundamentally ensure that the electric current that powers on of input is very little.And, relative to the impedance of control loop in prior art indirectly to control starting current, the present invention utilizes output control circuit, export the starting current starting control loop and power conversion module and directly control business board circuit, fundamentally realize the control to starting current, what the business board of ensure that powered on is perfectly safe.Meanwhile, relative to prior art, the present invention according to different occasion demand, by regulating sample circuit, can realize the accurate control to starting current.In addition, in prior art, start the electric current that powers on linearly to increase, and in circuit of the present invention, owing to utilizing output startup control loop and output control circuit respectively in the different phase powered on, power conversion module is fed back, and then the electric current that powers on of business board circuit can be kept comparatively to stablize or remain unchanged within a period of time, and then small area analysis can be maintained, until equipment normally starts always.
Accompanying drawing explanation
Fig. 1 is the basic electric power-feeding structure schematic diagram of a kind of communication facilities of the prior art;
Fig. 2 is a kind of electrical block diagram solving electrical equipment spark and produce of the prior art;
Fig. 3 is the electrical block diagram that another kind of the prior art solves the generation of electrical equipment spark;
Fig. 4 is the structural representation of the industrial ethernet switch installing hot plug control device of the present invention;
Fig. 5 is the Current Control process flow diagram of hot plug control device of the present invention to the hot plug process of business board;
Fig. 6 is hot plug control device first example structure block diagram of the present invention;
Fig. 7 is hot plug control device second example structure block diagram of the present invention
Fig. 8 is hot plug control device of the present invention 3rd example structure block diagram;
Fig. 9 be the present invention and prior art unloading phase curent change contrast schematic diagram;
Figure 10 is the electrical block diagram of the input startup control module in the present invention;
Figure 11 is the circuit theory diagrams of the output startup control loop in the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further detail.
As shown in Figure 4, industrial ethernet switch hot plug control device of the present invention is positioned at the backboard of described industrial ethernet switch, and is electrically connected between the backboard power supply buses of described industrial ethernet switch and business board circuit.Described industrial ethernet switch comprises backboard, power supply and at least 1 business board, described business board is plugged in described backboard, described power supply is powered to each business board being plugged in described backboard by the bus of described backboard, corresponds to business board described in each and be all connected with an industrial ethernet switch hot plug control device in the bus of described backboard.As the industrial ethernet switch in embodiment illustrated in fig. 4, comprise backboard, power supply and N number of business board (business board 1, business board 2 ..., business board N), this N number of business board is all plugged in described backboard, as being plugged in backboard by plug connector (not shown in Fig. 4), power supply is powered by this N number of business board of bus of backboard.Industrial ethernet switch hot plug control device in the present invention is arranged in described backboard, and is electrically connected on bus, and particular location can be positioned at the part that bus is close to each plug connector.Corresponding to N number of business board, the quantity of hot plug control device is also N number of, be respectively the 1st hot plug control device, 2nd hot plug control device, N hot plug control device, every 1 hot plug control device corresponds respectively to 1 business board to control curent change during each business board card hot plug one to one, as the 1st hot plug control device corresponds to the 1st business board to control electric current during hot plug the 1st business board, 2nd hot plug control device corresponds to the 2nd business board to control electric current during hot plug the 2nd business board, N hot plug control device corresponds to N business board to control electric current during hot plug N business board.
The effect of described hot plug control device is, cut off the power supply to business board in backboard, make the power supply of the power supply of backboard and business board isolated, to realize the control respectively of powering to each business board, and then avoid moment excessive the produced electric spark of the electric current in charged hot plug process between business board and backboard, prevent the generation of the mishaies such as the device damage of industrial ethernet switch and explosive fire accident.
As shown in Figure 5, hot plug control device of the present invention is to the Current Control flow process of the hot plug process of business board.Be different from existing hot plug control circuit, add Current Control, current sample in hot plug control device of the present invention and compare feedback function module, backboard power supply buses (as 48V) is by after Current Control, current sample and then be transported to business board to power to it, sample rate current compared simultaneously and feed back, and controlling backboard power supply buses further to the control of business board circuit supply current according to comparing feedback.
Its principle of work is: by current sample with the electric current that powers on of preset loop, then by comparing feedback circuit, controls the output voltage of power module, namely
I＝(V
C1-V
C2)/R
1 (1)
In V
c1.By regulating V
c1size, just can control V
c1-V
c2size, when R1 is constant, just can realize the control to loop current I.
Meanwhile, in order to reach control V
c1object, namely to control the waveform of the output voltage exporting to business board circuit, existingly be directed to described power supply so be different from and only have an output voltage control loop, also further increase an output voltage in one embodiment of the present of invention and start control loop and input starts control circuit.
As shown in Figure 6, the first example structure block diagram of hot plug control device 1 of the present invention.Wherein, hot plug control device 1 comprises input and starts control module 11, output control circuit 12 and power conversion module 14, the input end that described input starts control module 11 is electrically connected with backboard power supply buses 2, the input end of power conversion module 14 is electrically connected with the described output terminal starting control module 11 that inputs, the output terminal of described power conversion module 14 is electrically connected with the plug connector (Fig. 6 is not shown) being positioned at described backboard, and then the output terminal of described power conversion module 14 is electrically connected with described business board circuit 3 by described plug connector, the input end of described output control circuit 12 is electrically connected with the output terminal of described power conversion module 14, the output terminal of described output control circuit 12 is electrically connected with the feedback reception end of described power conversion module 14.Wherein, when described input starts control module 11 for being in not-connected status between described business board and described plug connector, namely before described business board inserts described plug connector, cut off the electrical connection between described backboard power supply buses 2 and described plug connector, and when described business board and described plug connector are in connection status, after described business board inserts described plug connector, namely connect the electrical connection between described backboard power supply buses 2 and described plug connector; The curtage that described output control circuit 12 exports to described business board circuit 3 for gathering described power conversion module 14, and feed back to the feedback reception end of described power conversion module 14; The feedback current of described power conversion module 14 for receiving according to its feedback reception end, the electric current of the backboard power supply buses 2 that its input end receives is adjusted, meet design requirement with the curtage making its output terminal export to business board circuit 3, the current value producing electric spark is less than to make the current value of backboard power supply buses electric current, and then avoid the generation of the electrical equipment spark when grafting business board, the electric current such as making its output terminal export to business board circuit 3 is less than 10A (ampere).In practice, if immediate current is greater than 10A when business board is plugged in backboard, very easily cause the generation of electrical equipment spark, so when grafting business board, must ensure that the immediate current that backboard power supply buses 2 is powered to business board circuit 3 is at least less than 10A.In application scenario, colliery, the maximum current according to concrete regulation in " Table A 1, the permissible short circuit current that voltage is corresponding with facility level " in GB GB3836.4 under each voltage.Namely designing requirement described in the present invention is the required electric current of setting, " Table A 1; permissible short circuit current that voltage is corresponding with facility level " in this basis of design GB GB3836.4, thus the requirement that flexibly reply is different, to avoid the generation of the electrical equipment spark when grafting business board.
Described output control circuit 12 includes output voltage sampling module 121 and the first feedback module 122 further, the input end of described output voltage sampling module 121 is electrically connected with the output terminal of described power conversion module 14, the input end of described first feedback module 122 is electrically connected with the output terminal of described output voltage sampling module 121, and the output terminal of described first feedback module 122 is electrically connected with the feedback reception end of described power conversion module 14.Wherein, the voltage that exports to described business board circuit 3 for gathering described power conversion module 14 of described output voltage sampling module 121.Described first feedback module 122, for the sampled result according to described output voltage sampling module 121, controls power conversion module 14 and is operated in voltage stabilizing state, thus guarantee that the supply voltage of business board circuit 3 is normal.
First embodiment of the hot plug control device 1 shown in Fig. 6 can prevent the generation of the electrical equipment spark when business board is plugged in backboard substantially, and after can ensureing that business board is plugged in backboard, by output voltage sampling module 121 to the feedback of described power conversion module 14 with the electric current controlling backboard power supply buses 2 and power to business board circuit 3 in safety zone, and then prevent that electric current is excessive to be damaged business board circuit 3.
But, the moment of the first embodiment when business board is plugged in backboard of the hot plug control device 1 shown in Fig. 6, still unexpected peak value may be there is in curent change, requiring (such as mine, refinery etc.) under higher environment like this, also need to carry out controlling to avoid the peak value produced suddenly further, to increase its security to the electric current that sparks.Second example structure block diagram of concrete hot plug control device of the present invention 1 as shown in Figure 7.
As shown in Figure 7, second embodiment of hot plug control device 1 of the present invention also includes further to export and starts control loop 13 and feedback switching gauge tap 15 on the basis of the first embodiment, the described input end starting control loop 13 that exports is electrically connected with the loop (Fig. 7 is not shown) between described business board circuit 3 to backboard power supply buses 2, the described output terminal starting control loop 13 that exports is electrically connected with the feedback reception end of described power conversion module 14, described feedback switches gauge tap 15 and is electrically connected between described output control circuit 12 and power conversion module 14, and described feedback switches gauge tap 15 to be also electrically connected with the described control end starting control loop 13 that exports.Gauge tap 15 is switched owing to adding feedback in the second embodiment, make the output terminal of output control circuit 12 not be directly be electrically connected with the feedback reception end of described power conversion module 14, but be electrically connected with the feedback reception end of described power conversion module 14 by this feedback switching gauge tap 15.
Described export start control loop 13 for described backboard power supply buses 2 to business board circuit 3 power unloading phase (namely the plug connector of business board insertion backboard instantaneously), gather the loop current between described business board circuit 3 to backboard power supply buses 2 and feed back to the feedback reception end of described power conversion module 14, meanwhile switch gauge tap 15 by described feedback and cut off the circuit of described output control circuit 12 to described power conversion module 14, with make described power conversion module 14 can described backboard power supply buses 2 to business board circuit 3 power unloading phase, according to export start control loop 13 to gather and the electric current of backboard power supply buses 2 that the input end of described loop current to power conversion module 14 fed back receives adjusts, described power supply unloading phase terminate after, stop the loop current between the described business board circuit 3 to backboard power supply buses 2 of collection and switch gauge tap 15 by described feedback connecting the circuit of described output control circuit 12 to described power conversion module 14, after can terminating unloading phase described backboard power supply buses 2 is powered to business board circuit 3 to make described power conversion module 14, again according to output control circuit 12 gather and the voltage that exports to described business board circuit 3 of the described power conversion module 14 fed back, the voltage of the backboard power supply buses 2 that the input end of power conversion module 14 receives is adjusted.
Described feedback switches gauge tap 15 for exporting according to described the control starting control loop 13, cuts off or connect the circuit of described output control circuit 12 to described power conversion module 14.Specifically, described feedback switches gauge tap 15 and a triode can be adopted to make switch, be connected between output control circuit 12 and duty cycle adjustment module 18, the emitter of such as triode (positive-negative-positive) is electrically connected with the first feedback module 122 in output control circuit 12, the collector of triode is electrically connected with duty cycle adjustment module 18, the base stage of triode is electrically connected with output the second feedback module 132 started in control loop 13, decides triode whether conducting according to the result of the second feedback module 132 exported in startup control loop 13.
In Fig. 7, export startup control loop 13 and comprise loop current sampling module 131 and the second feedback module 132, the input end of described loop current sampling module 131 is electrically connected with the loop (Fig. 7 is not shown) between described business board circuit 3 to backboard power supply buses 2, the input end of described second feedback module 132 is electrically connected with the output terminal of described loop current sampling module 131, the output terminal of described second feedback module 132 is electrically connected with described power conversion module 14 feedback reception end, the control end of described second feedback module 132 switches gauge tap 15 be electrically connected with described feedback.Wherein, described loop current sampling module 131 for described backboard power supply buses 2 to business board circuit 3 power unloading phase, gather the loop current between described business board circuit 3 to backboard power supply buses 2; Described power supply unloading phase terminate after, stop gathering the loop current between described business board circuit 3 to backboard power supply buses 2.Described second feedback module 132 for described backboard power supply buses 2 to business board circuit 3 power unloading phase, the current feedback gathered by described loop current sampling module 131 gives the feedback reception end of described power conversion module 14, meanwhile switches gauge tap 15 by described feedback and cuts off the circuit of described output control circuit 12 to described power conversion module 14; Described power supply unloading phase terminate after, stop feeding back to the feedback reception end of described power conversion module 14 electric current that described loop current sampling module 131 gathers, and connect the circuit of described output control circuit 12 to described power conversion module 14 by described feedback switching gauge tap 15.
Second embodiment adds a control loop compared with the first embodiment, so make power conversion module 14 can respectively unloading phase described backboard power supply buses 2 is powered to business board circuit 3 and this unloading phase terminate after loop respectively between described business board circuit 3 to backboard power supply buses 2 and power conversion module 14 carry out voltage/current sampling respectively to the feed circuit of described business board circuit 3 and feed back to power conversion module 14.Like this, just can the controlling of sampling power conversion module 14 according to the different circuit pathways between backboard power supply buses 2 and business board circuit 3 stage by stage to the supply current size of business board circuit 3, with the electrical equipment spark preventing business board and backboard from producing in hot plug moment further, and produced immediate current can be reduced to prevent the damage of equipment in hot plug moment.The setting of output startup control loop 13 can realize the adjustment to power conversion module 14, makes it be operated in output constant current pattern.
As shown in Figure 8, be hot plug control device 1 of the present invention 3rd example structure block diagram.Can have influence on supply waveform because being subject to interference in various degree in the circuit of electrical equipment, therefore the 3rd embodiment of hot plug control device 1 of the present invention adds input rectifying filtration module 16, output rectification filter module 17 and duty ratio adjusting circuit 18 on the basis of the second embodiment.
Wherein, described input rectifying filtration module 16 is connected between described backboard power supply buses 2 and power conversion module 14, carries out rectifying and wave-filtering for the electric current inputted to described power conversion module 14 described backboard power supply buses 2.In the present invention, it is also connect between described backboard power supply buses 2 and power conversion module 14 that input starts control module 11, so, described input rectifying filtration module 16 can be connected to described backboard power supply buses 2 and input starts between control module 11, also can be connected to described input and start between control module 11 and power conversion module 14.Consider, supply current waveform may to the interference starting control module 11, described input rectifying filtration module 16 is connected between described backboard power supply buses 2 and input startup control module 11 better, the connected mode of input rectifying filtration module 16 as shown in Figure 8.
Described output rectification filter module 17 is connected between described power conversion module 14 and business board circuit 3, carries out rectifying and wave-filtering for the electric current exported to described business board circuit 3 described power conversion module 14.With reference to shown in Fig. 8, output control circuit 12 is to the collection of described power conversion module 14 to described business board circuit 3 output current, that the electric current exported at described power conversion module 14 carries out after output rectification filter module 17, that is, it is latter linked that the electrical connection of the input end of described output control circuit 12 and the output terminal of described power conversion module 14 is through described output rectification filter module 17, and namely the input end of described output control circuit 12 is electrically connected on the link of described output rectification filter module 17 and described business board circuit 3.This structural design considers that electric current that described output rectification filter module 17 is sampled does not have noisy electric current after being filtering, so just effectively can control the size of power conversion module 14 output currents.
Described duty ratio adjusting circuit 18 is electrically connected with the feedback reception end of described power conversion module 14, and start control loop 13 with described output control circuit 12 and exporting and be electrically connected to the circuit pathways of described power conversion module 14, wherein said output control circuit 12 is connected to described duty ratio adjusting circuit 18 after described feedback switching gauge tap 15.Duty ratio adjusting circuit 18 feeds back to described power conversion module 14 feedback current for described output control circuit 12 and exporting being started control loop 13 carries out duty cycle adjustment, with make the feedback current after regulating can identify by described power conversion module 14 that being beneficial to described power conversion module 14 adjusts the electric current that it exports.
As shown in Figure 9, control loop 13 is started because add to export in the second embodiment of the present invention and the 3rd embodiment, therefore compared with prior art, described backboard power supply buses 2 to business board circuit 3 power unloading phase, would not continue in time to have changed after electric current rises to set point, be constant current.Described backboard power supply buses 2 to business board circuit 3 power unloading phase, the output of growth just in the present invention controlling electric current starts the thing that control loop 13 will do, during this time the output voltage of power conversion module 14 increases, this unloading phase just refer to that output voltage is from zero to the process of normal working voltage.
In the present invention, as shown in Figure 10, described input startup control module 11 comprises an electrochemical capacitor C201, a resistance R201, relay K 201, a 1 first diode D201 and one second diode D202.Wherein, the positive terminal of described electrochemical capacitor C201 is electrically connected with described backboard power supply buses 2, the negative pole end ground connection of described electrochemical capacitor C201, one end of described resistance R201 is electrically connected with a 12V supply voltage, the moving contact of described relay K 201 is electrically connected with described backboard power supply buses 2 (or output terminal of input rectifying filtration module 16), the normally opened contact of described relay K 201 is electrically connected with the input end of described power conversion module 14, and then be electrically connected with the plug connector being positioned at described backboard, to be electrically connected with described business board circuit 3 by described plug connector, the controlled contact of coil first of described relay K 201 is electrically connected with the other end of described resistance R201, the controlled contact of coil second of described relay K 201 is electrically connected with the business board contact pin (Port) in described plug connector, and then when described business board is plugged in described plug connector, the coil generation current of described relay K 201 is connected with the moving contact and normally opened contact that make described relay K 201, and then connect the circuit of described backboard power supply buses 2 to described business board, the positive terminal of described first diode D201 and the second diode D202 is all electrically connected with the business board contact pin in described plug connector, the negative pole end of described first diode D201 and the second diode D202 is all electrically connected with the other end of described resistance R201, and the setting of the first diode D201 and the second diode D202 is that the high pressure preventing the break-make of relay coil from producing causes damage to relay K 201 and other circuit.
This input starts the circuit structure of control module 11 and utilizes relay K 201 to achieve from 12V supply voltage to the switch control rule of the small area analysis of business board contact pin to the big current of backboard power supply buses 2 pairs of business board circuit 3 power supplies, ensure that the power supply being stuck in grafting moment backboard power supply buses 2 pairs of business board circuit 3 at business board is 0, and then within the very short time subsequently, the power supply of backboard power supply buses 2 pairs of business board circuit 3 can be risen from 0, and then realizes 0 voltage access.Thus avoid producing electrical equipment spark when unexpected grafting business board due to the voltage difference between backboard power supply buses 2 and business board circuit 3.
As shown in figure 11 for exporting the concrete schematic diagram starting control loop 13.It comprises electric capacity C1, electric capacity C2, transformer T3, resistance R71, electric capacity C31, diode D17, electric capacity C361, resistance R73, resistance R78, operational amplifier A R1, resistance R82, electric capacity C363, electric capacity C364, resistance R79, electric capacity C362, optocoupler PC1 and resistance R80.
Wherein, described electric capacity C1 and electric capacity C2 corresponds respectively to electric capacity C1 in Fig. 3 and electric capacity C2, and electric capacity C1 is equivalent to the output capacitance of backboard bus, and electric capacity C2 is equivalent to the input capacitance of business board, and electric capacity C1 and electric capacity C2 is electrochemical capacitor.Current sample transformer T3 is connected in business board circuit 3 on the earth terminal GND in the loop of backboard power supply buses 2.The concrete structure of circuit shown in Figure 11 is as follows.
The negative pole end of electric capacity C1 is electrically connected with primary coil one end of transformer T3, and with the power supply of backboard be electrically connected, the positive terminal of electric capacity C1 is electrically connected with the positive output end of backboard power supply; The negative pole end of electric capacity C2 is electrically connected with the primary coil of transformer T3 former limit Same Name of Ends, and with the power supply of business board be electrically connected, the positive pole termination of electric capacity C2 is electrically connected with the positive input anode of business board power supply; One end of the secondary coil of transformer T3 is electrically connected with one end of resistance R71, electric capacity C31 and electric capacity C361, and ground connection; The secondary Same Name of Ends of the secondary coil of transformer T3 is electrically connected with the other end of resistance R71 and electric capacity C31, and is electrically connected with the positive terminal of diode D17; The negative-phase input of operational amplifier A R1 is electrically connected with the other end of the negative pole end of diode D17 and electric capacity C361, and is electrically connected with one end of resistance R82 and electric capacity C364; The normal phase input end of operational amplifier A R1 is electrically connected with one end of resistance R73 and resistance R78; Another termination 1.24V supply voltage of resistance R73, the other end ground connection of resistance R78; The other end of resistance R82 is electrically connected with one end of electric capacity C363; The output terminal of operational amplifier A R1 is electrically connected with the other end of electric capacity C364 and electric capacity C363, and is connected with the negative electricity of light emitting diode in optocoupler PC1; The VCC pin of operational amplifier A R1 is electrically connected with one end of resistance R79 and electric capacity 362, and connects 12V supply voltage; The GND pin ground connection of operational amplifier A R1; The other end ground connection of electric capacity 362; In photoelectrical coupler PC1, the positive pole of light emitting diode is electrically connected with the other end of resistance R79; The grounded emitter of phototriode in photoelectrical coupler PC1, in photoelectrical coupler PC1, the collector of phototriode is electrically connected with one end of resistance R80, and the other end of resistance R80 is electrically connected with PWM control pin.Wherein PWM control pin connects duty cycle adjustment module 18.
When grafting business board, the course of work of the current sample module 13 shown in Figure 11 is as follows:
In loop, electric current flows through the former limit of T3, electric current is after T3 conversion, the namely current flowing resistance R71 of the secondary of T3, produce pressure drop VR71, after VR71 deducts the pressure drop of diode VD17, compare with the dividing potential drop of reference voltage 12.4V, after being amplified by application condition, the output voltage of error amplifier just can determine the size of current flowing through optocoupler diode, also the size of dutycycle is just determined, so just can the output voltage of regulating power modular converter 14, the change of output voltage affects loop current again, so just forms a closed-loop control.
Industrial ethernet switch hot plug control device of the present invention is due to comprised startup control module 11 and then can ensure that subcard is in access moment, the supply voltage of backboard power supply buses 2 is started from scratch, compared to traditional approach, fundamentally ensure that the electric current that powers on of input is very little.And, relative to the impedance of control loop in prior art indirectly to control starting current, the present invention utilizes output control circuit 12, exports startup control loop 13 and the power conversion module 14 directly starting current of control to business board circuit 3, fundamentally realize the control to starting current, what the business board of ensure that powered on is perfectly safe.Meanwhile, relative to prior art, the present invention according to different occasion demand, by regulating sample circuit, can realize the accurate control to starting current, namely artificially can establish the value of starting current, such as:
Circuit according to Figure 11, can set current value is
I＝[1.24×R78÷(R73+R78)+VD17]×N÷R71
Wherein N is that pounding of the primary and secondary coil of former secondary of current sample transformer T3 counts ratio.So just, can be counted than setting starting current value by the pounding of primary and secondary coil of adjustment transformer T13.
In addition, in prior art, start the electric current that powers on linearly to increase, and in circuit of the present invention, feed back owing to utilizing output startup control loop 13 and output control circuit 12 pairs of power conversion modules 14 respectively in the different phase powered on, and then the electric current that powers on of business board circuit 3 can be kept comparatively to stablize or remain unchanged within a period of time (feedback by output control circuit 12), and then small area analysis can be maintained, until equipment normally starts always.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. an industrial ethernet switch hot plug control device, is characterized in that: described hot plug control device is electrically connected between the backboard power supply buses of described industrial ethernet switch and business board circuit, described hot plug control device comprises input and starts control module, output control circuit and power conversion module, the input end that described input starts control module is electrically connected with described backboard power supply buses, the input end of described power conversion module is electrically connected with the output terminal of described startup control module, the output terminal of described power conversion module is electrically connected with described business board circuit by the plug connector being positioned at described backboard, the input end of described output control circuit is electrically connected with the output terminal of described power conversion module, the output terminal of described output control circuit is electrically connected with the feedback reception end of described power conversion module, wherein,
Described input starts the electrical connection that control module is used for cutting off when being in not-connected status between described business board and described plug connector between described backboard power supply buses and described plug connector, and connects the electrical connection between described backboard power supply buses and described plug connector when described business board and described plug connector are in connection status;
The curtage that described output control circuit exports to described business board circuit for gathering described power conversion module, and feed back to the feedback reception end of described power conversion module;
Described power conversion module is used for the feedback current received according to its feedback reception end, adjusts, be less than to make the current value of backboard power supply buses electric current the current value producing electric spark to the electric current of the backboard power supply buses that its input end receives.
2. industrial ethernet switch hot plug control device according to claim 1, is characterized in that:
Described output control circuit comprises output voltage sampling module and the first feedback module, the input end of described output voltage sampling module is electrically connected with the output terminal of described power conversion module, the input end of described first feedback module is electrically connected with the output terminal of described output voltage sampling module, and the output terminal of described first feedback module is electrically connected with the feedback reception end of described power conversion module; Wherein,
The voltage that described output voltage sampling module exports to described business board circuit for gathering described power conversion module;
Described first feedback module is used for the sampled result according to described output voltage sampling module, controls described power conversion module and is operated in voltage stabilizing state.
3. industrial ethernet switch hot plug control device according to claim 1, is characterized in that:
Described hot plug control device also comprises output and starts control loop and feedback switching gauge tap, the described input end starting control loop that exports is electrically connected with the loop between described business board circuit to backboard power supply buses, described output starts the output terminal of control loop and is electrically connected with the feedback reception end of described power conversion module, described feedback switches gauge tap and is electrically connected between described output control circuit and power conversion module, and described feedback switching gauge tap is also electrically connected with the described control end starting control loop that exports; Wherein,
Described export start control loop be used for described backboard power supply buses to business board circuit power unloading phase, gather the loop current between described business board circuit to backboard power supply buses and feed back to the feedback reception end of described power conversion module, meanwhile switching gauge tap by described feedback and cut off the circuit of described output control circuit to described power conversion module; Described power supply unloading phase terminate after, stop the loop current gathering between described business board circuit to backboard power supply buses also to connect the circuit of described output control circuit to described power conversion module by described feedback switching gauge tap;
Described feedback switches gauge tap and is used for exporting according to described the control starting control loop, cuts off or connect the circuit of described output control circuit to described power conversion module.
4. industrial ethernet switch hot plug control device according to claim 3, is characterized in that:
Described output starts control loop and comprises loop current sampling module and the second feedback module, the input end of described loop current sampling module is electrically connected with the loop between described business board circuit to backboard power supply buses, the input end of described second feedback module is electrically connected with the output terminal of described loop current sampling module, the output terminal of described second feedback module is electrically connected with described power conversion module, and the control end of described second feedback module switches gauge tap be electrically connected with described feedback; Wherein,
Described loop current sampling module be used for described backboard power supply buses to business board circuit power unloading phase, gather the loop current between described business board circuit to backboard power supply buses; Described power supply unloading phase terminate after, stop gathering the loop current between described business board circuit to backboard power supply buses;
Described second feedback module be used for described backboard power supply buses to business board circuit power unloading phase, the current feedback gathered by described loop current sampling module gives the feedback reception end of described power conversion module, meanwhile switches gauge tap by described feedback and cuts off the circuit of described output control circuit to described power conversion module; Described power supply unloading phase terminate after, stop feeding back to the feedback reception end of described power conversion module the electric current that described loop current sampling module gathers, and connect the circuit of described output control circuit to described power conversion module by described feedback switching gauge tap.
5. industrial ethernet switch hot plug control device according to claim 1, is characterized in that, described input starts control module and comprises an electrochemical capacitor, a resistance, a relay, one first diode and one second diode; Wherein,
The positive terminal of described electrochemical capacitor is electrically connected with described backboard power supply buses, the negative pole end ground connection of described electrochemical capacitor;
One end of described resistance is electrically connected with a 12V supply voltage;
The moving contact of described relay is electrically connected with described backboard power supply buses, the normally opened contact of described relay is electrically connected with the input end of described power conversion module, and then be electrically connected with the plug connector being positioned at described backboard, to be electrically connected with described business board circuit by described plug connector, the controlled contact of coil first of described relay is electrically connected with the other end of described resistance, the controlled contact of coil second of described relay is electrically connected with the business board contact pin in described plug connector, and then when described business board is plugged in described plug connector, the coil generation current of described relay is connected with the moving contact and normally opened contact that make described relay, and then connect the circuit of described backboard power supply buses to described business board,
The positive terminal of described first diode and the second diode is all electrically connected with the business board contact pin in described plug connector, and the negative pole end of described first diode and the second diode is all electrically connected with the other end of described resistance.
6. the industrial ethernet switch hot plug control device according to any one of claim 1 to 5, is characterized in that, described hot plug control device also comprises:
Input rectifying filtration module, is connected between described backboard power supply buses and power conversion module, carries out rectifying and wave-filtering for the electric current inputted to described power conversion module described backboard power supply buses.
7. the industrial ethernet switch hot plug control device according to any one of claim 1 to 5, is characterized in that, described hot plug control device also comprises:
Output rectification filter module, is connected between described power conversion module and business board circuit, carries out rectifying and wave-filtering for the electric current exported to described business board circuit described power conversion module.
8. the industrial ethernet switch hot plug control device according to any one of claim 1 to 5, is characterized in that, described hot plug control device also comprises:
Duty ratio adjusting circuit, is electrically connected with the feedback reception end of described power conversion module, and the feedback current feeding back to described power conversion module for described output control circuit and output being started control loop carries out duty cycle adjustment.
9. industrial ethernet switch hot plug control device according to claim 8, is characterized in that:
Described output starts control loop and comprises electric capacity C1, electric capacity C2, transformer T3, resistance R71, electric capacity C31, diode D17, electric capacity C361, resistance R73, resistance R78, operational amplifier A R1, resistance R82, electric capacity C363, electric capacity C364, resistance R79, electric capacity C362, optocoupler PC1 and resistance R80;
The negative pole end of described electric capacity C1 is electrically connected with primary coil one end of described transformer T3, and with the power supply of described backboard be electrically connected, the positive terminal of electric capacity C1 is electrically connected with the positive output end of backboard power supply; The negative pole end of described electric capacity C2 is electrically connected with the primary coil former limit Same Name of Ends of described transformer T3, and with the power supply of described business board be electrically connected, the positive pole termination of electric capacity C2 is electrically connected with the positive input anode of business board power supply; One end of the secondary coil of described transformer T3 is electrically connected with one end of resistance R71, electric capacity C31 and electric capacity C361, and ground connection; The secondary Same Name of Ends of the secondary coil of described transformer T3 is electrically connected with the other end of resistance R71 and electric capacity C31, and is electrically connected with the positive terminal of diode D17; The negative-phase input of described operational amplifier A R1 is electrically connected with the other end of the negative pole end of diode D17 and electric capacity C361, and is electrically connected with one end of resistance R82 and electric capacity C364; The normal phase input end of described operational amplifier A R1 is electrically connected with one end of resistance R73 and resistance R78; Another termination 1.24V supply voltage of described resistance R73, the other end ground connection of described resistance R78; The other end of described resistance R82 is electrically connected with one end of electric capacity C363; The output terminal of described operational amplifier A R1 is electrically connected with the other end of electric capacity C364 and electric capacity C363, and is connected with the negative electricity of light emitting diode in optocoupler PC1; The VCC pin of operational amplifier A R1 is electrically connected with one end of resistance R79 and electric capacity 362, and connects 12V supply voltage; The GND pin ground connection of described operational amplifier A R1; The other end ground connection of described electric capacity 362; In photoelectrical coupler PC1, the positive pole of light emitting diode is electrically connected with the other end of resistance R79; The grounded emitter of phototriode in described photoelectrical coupler PC1, in photoelectrical coupler PC1, the collector of phototriode is electrically connected with one end of resistance R80, and the other end of resistance R80 is electrically connected with PWM control pin; Wherein, described PWM control pin is electrically connected with duty cycle adjustment module.
10. an industrial ethernet switch, comprise backboard, power supply and at least 1 business board, described business board is plugged in described backboard, described power supply is powered to each business board being plugged in described backboard by the bus of described backboard, it is characterized in that: correspond to business board described in each in the bus of described backboard and be all connected with an industrial ethernet switch hot plug control device as described in any one of claim 1 to 9.
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| CN106681203A (en) * | 2016-11-27 | 2017-05-17 | 北京特种机械研究所 | Hot swapping device and method for real-time detection of industrial Ethernet sites |
| CN109428798B (en) * | 2017-08-25 | 2021-05-28 | 上海微电子装备（集团）股份有限公司 | Conversion device between industrial Ethernet and DeviceNet |
| CN107612853A (en) * | 2017-08-30 | 2018-01-19 | 南京南业电子科技有限公司 | A kind of built-in industrial switch |
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| CN1148073C (en) * | 1999-11-18 | 2004-04-28 | 华为技术有限公司 | Single board of exchanger for implementing hot exchange and its backplate |
| CN2615948Y (en) * | 2003-02-24 | 2004-05-12 | 上海德创电器电子有限公司 | Thermal connecting & disconnecting secondary power supply for electric system automation equipment |
| CN100353642C (en) * | 2004-07-31 | 2007-12-05 | 华为技术有限公司 | Method and device of realizing hot plug for power distribution singleboard |
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Address after: 100085 Beijing, Haidian District on the basis of information industry on the West Road, No. 38 Patentee after: GW DELIGHT TECHNOLOGY CO, LTD. Patentee after: Gelin Weier Sci-Tech Development Co., Ltd., Beijing Address before: 100085 Beijing, Haidian District on the basis of information industry on the West Road, No. 38 Patentee before: Beijing GW Delight Technology Co., Ltd. Patentee before: Gelin Weier Sci-Tech Development Co., Ltd., Beijing |
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