EP4316945A1 - Dispositif de transmission de signal d'une installation technique de sécurité de signal destiné à la transmission sécurisée d'un signal ca - Google Patents

Dispositif de transmission de signal d'une installation technique de sécurité de signal destiné à la transmission sécurisée d'un signal ca Download PDF

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Publication number
EP4316945A1
EP4316945A1 EP22188972.8A EP22188972A EP4316945A1 EP 4316945 A1 EP4316945 A1 EP 4316945A1 EP 22188972 A EP22188972 A EP 22188972A EP 4316945 A1 EP4316945 A1 EP 4316945A1
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EP
European Patent Office
Prior art keywords
signal
channel
output channel
output
transmission device
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Pending
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EP22188972.8A
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German (de)
English (en)
Inventor
Thomas Gebert
Enrico ANDERS
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GTS Deutschland GmbH
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GTS Deutschland GmbH
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Publication date
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Priority to EP22188972.8A priority Critical patent/EP4316945A1/fr
Publication of EP4316945A1 publication Critical patent/EP4316945A1/fr
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/16—Devices for counting axles; Devices for counting vehicles
    • B61L1/168—Specific transmission details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
    • B61L27/70—Details of trackside communication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1881—Wiring diagrams for power supply, control or testing

Definitions

  • the invention relates to a signal transmission device of a signaling security system for the secure transmission of signal information of an AC signal to a processing unit, having an input circuit for detecting the AC signal, the input circuit comprising a first input channel and a second input channel, and an output circuit for evaluating the AC -Signal, wherein the output circuit comprises at least a first output channel and at least a second output channel, the first output channel and the second output channel being galvanically isolated from one another, the first input channel being connected via a first coupling element to the at least one first output channel but from the at least one first output channel is galvanically isolated, wherein the second input channel is connected to the at least one second output channel via a second coupling element but is galvanically isolated from the at least one second output channel, each input channel comprising a plurality of series-connected resistors.
  • the invention also relates to a signaling security system with a signal transmission device according to the invention.
  • the invention further relates to the use of a signal transmission device according to the invention.
  • Secure signal transmission of AC signals is important, for example, in order to provide the processing unit with information regarding a signal term of a traffic signal or axle counting information and to reveal errors in the signal transmission.
  • AC signals are picked up by a component of a signaling security system, for example a signal lamp, and the information obtained from them is sent back to the signal box as a command.
  • Such a signal transmission device has become known from the Vital21 [01] transmission system, which is used, among other things, for the secure transmission of data for controlling signal boxes and error disclosure.
  • the Vital21 transmission system has an input/output unit with a two-channel interface module controlled by a microcontroller.
  • the interface module reads input information via optocoupler inputs and passes on output information via output relays.
  • the two data channels are designed independently of one another.
  • the signal transmission device includes two input channels and two output channels, each with a microcontroller for evaluating the signals.
  • the electrical resistors are designed in a safety design.
  • a circuit for the separate transmission of different half-waves is known CN 105759204 B [02]. This is a diagnostic circuit for electric vehicle chargers.
  • the signal transmission device is characterized in that at least two of the resistances of each input channel differ in at least one characteristic, and in that each input channel comprises a plurality of voltage-direction-dependent electronic switching devices connected in series, at least two of the voltage-direction-dependent electronic switching devices of each input channel differing in at least one characteristic, and wherein the voltage direction dependent electronic switching devices of the first input channel are electrically connected to the AC signal source with opposite polarity than the voltage direction dependent electronic switching devices of the second input channel.
  • the AC signal from the AC signal source alternately activates the first or second input channel depending on the polarity.
  • the associated coupling elements are also activated with the first and second input channels, so that the first coupling element transmits a first partial signal of the AC signal and the second coupling element transmits a second partial signal of the AC signal from the associated input channel into the output circuit.
  • the first partial signal is the part of the AC signal with a first polarity
  • the second partial signal is the part of the AC signal with a second polarity that is opposite to the first polarity.
  • the partial signals follow one another directly and are designed as half waves, particularly in the case of sinusoidal AC signals.
  • the coupling elements thus transmit alternately and in a pulsed form a transmission signal or output signal in the form of one of the two partial signals of the AC signal from the input circuit to the output circuit. Due to the connection of the input channels in opposite polarity, the two output signals of the coupling elements have a time offset which is related to the duration of the polarity of the input signal.
  • independent signal information for the two (or possibly more) independent output channels is generated from different time intervals (positive half-wave or negative half-wave) of the AC signal from the signal source. This enables reliable detection and evaluation of this signal for its presence at the input.
  • the partial signals of the AC signal transmitted through the coupling elements can be compared with one another to find transmission errors and/or reassembled into an overall signal.
  • An analysis of the partial signals can be carried out in particular with an FPGA (Field Programmable Gate Array) and/or a monostable circuit.
  • the resistors and voltage direction-dependent electronic switching devices have different failure behavior due to the different parameters. In particular, it is prevented that the resistors or voltage direction-dependent electronic switching devices in an input channel fail at the same time. If one of the aforementioned components fails, damage to the signal transmission device is prevented by the remaining electrical components in the input channel. A failure of one of the electrical components in one of the input channels leads to a change in the output signal that the coupling element arranged in the relevant input channel emits. The failure of the relevant electrical component can therefore be reliably detected by comparing this output signal with the output signal of the coupling element in the other input channel. A signaling security at the Transmission of the AC signal is therefore ensured even when structurally simple, inexpensive electrical components are used in the signal transmission device.
  • the use of resistors and voltage direction-dependent electronic switching devices with different parameters is also referred to in the application as “diversification” of these electrical components.
  • the diversification according to the invention ensures in particular that common mode errors cannot occur, since the different components have different robustness and manufacturing-related errors do not occur in the same way (type of failure) and at the same time (time of failure). impact.
  • the input circuit can be used as a safe AC input.
  • the coupling elements between the input channels and the output channels enable the AC signal to be transmitted, with interference currents between the input channels and the output channels during signal transmission being avoided due to the galvanic isolation between the input channels and the output channels.
  • the galvanic isolation of the output channels achieves signal independence.
  • Signaling independence means in particular that two or more functionally interacting output channels cannot lead to a dangerous condition due to their common malfunction. This prevents systematic multiple failures. This makes it possible to prove that individual failures are harmless and thus ensure safe functioning.
  • the signaling independence is brought about in particular by preventing distortion of the signals in the input channels and/or the output channels due to an incorrect current flow between the input channels and the output channels and/or the output channels among themselves, in that the respective signal transmission takes place without electrical conductors.
  • the basic circuit could be multiplied again to increase the number of channels and thus the independence of signal evaluation. There are then several channels for the negative half-wave and/or several channels for positive half-waves, so that redundancy is created for the corresponding time interval.
  • the device according to the invention enables signal information to be entered safely in terms of signaling technology.
  • the signal source is, for example, a signal lamp whose signal concept is to be transmitted to a signal box.
  • the AC current flowing through the lamp of the signal lamp is tapped.
  • the voltage direction-dependent electronic switching devices are preferably diodes.
  • the series connected diodes are connected in series with the series connected resistors.
  • An advantageous embodiment of the signal transmission device is characterized in that at least one of the resistors, preferably all resistors, have a design that allows a short circuit in the event of a defect. Components with a safety design (inherently safe components) can therefore be dispensed with. This can save costs and time in development.
  • a preferred embodiment of the signal transmission device is characterized in that the at least one parameter is the manufacturer and/or the service life and/or the robustness and/or nominal values and/or component shapes and/or component technologies.
  • Sufficiently different parameters of the resistances in the respective input channel and/or of the voltage direction-dependent electronic switching devices in the respective input channel ensure that the relevant electrical components do not fail in the same way and that a short circuit occurs during operation of the signal transmission device in the first or second input channel.
  • the characteristics of two resistors in an input channel differ by at least a factor of 1.1 or the characteristics of voltage direction-dependent electronic switching devices in an input channel differ by at least a factor of 1.1
  • the aforementioned parameters also have an influence on the change behavior of the electrical components of the respective input channels through use. This means that individual components that initially have a comparatively small defect due to use can be identified and/or replaced at an early stage, while the remaining components in the relevant input channel are still functional. This avoids reaching a critical situation.
  • the coupling elements are optocouplers.
  • Optocouplers are advantageously designed to be compact and transmit the AC signal using light signals with little or no delay time.
  • the transmitting parts of the optocouplers are in particular part of one of the input channels (first optocoupler in the first input channel, second optocoupler in the second input channel), whereas the receiving parts of the optocouplers are each part of one of the output channels.
  • the polarity / forward direction of the optocouplers is preferably selected according to the forward direction of the diodes in the corresponding input channel.
  • a transformer/transformer a DC/DC transformer or an optical fiber (fiber optic cable) with fiber optic transmitter and fiber optic receiver can also be used.
  • An embodiment of the signal transmission device is advantageous, which is characterized in that the output circuit is set up to transmit signal information from the first output channel to the second output channel and from the second output channel to the first output channel by means of further coupling elements.
  • the entire signal information that is transmitted into the output circuit can be evaluated on just one output channel. This increases the reliability of the transmission of the partial signals of the AC signal, since the entire signal information can be tapped externally on each of the two output channels.
  • Each of the two output channels always has independent information from both channels, which is important for a reliable evaluation of the presence of the signal from the signal source.
  • the signal transmission device can be used more flexibly due to the various options for tapping the partial signals of the AC signal.
  • a further development of the aforementioned embodiment is characterized in that a third optocoupler is used to transmit the signal information from the first output channel to the second output channel and a fourth optocoupler is used to transmit the signal information from the second output channel to the first output channel, the first output channel being the transmitting part of the third optocoupler and the receiving part of the fourth optocoupler, and wherein the second output channel comprises the transmitting part of the fourth optocoupler and the receiving part of the third optocoupler.
  • the third and fourth optocouplers enable fast signal transmission between the output channels. They also ensure galvanic isolation of the output channels to avoid interference signals between the output channels during signal transmission.
  • An advantageous embodiment of the embodiments of the signal transmission device with the coupling elements for coupling the output channels is characterized in that the output channels are set up for this purpose are to compare the signal information of the first output channel with the signal information of the second output channel.
  • the optocoupler outputs of the first and second optocouplers show different signals. Accordingly, the optocoupler outputs of the third and fourth optocouplers show different signals and the error can be immediately identified by comparison.
  • the comparison preferably takes place in the signal transmission device, i.e. before transmission to the processing unit.
  • the comparison preferably takes place in the signal transmission device, i.e. before transmission to the processing unit.
  • a further embodiment of the signal transmission device is characterized in that the signal transmission device is part of a signal box, a vehicle device, a field element, in particular an axle counter, or a control element.
  • the signal transmission device ensures secure signal transmission from the element, of which it is designed as part, to a processing unit, whereby comparatively inexpensive, simply structured electrical components can be used in the signal transmission device.
  • a signaling security system has a processing unit, an AC signal source for providing an AC signal, and a signal transmission device according to the invention described above.
  • secure communication can take place between modules of the control and security technology of the signaling security system.
  • An advantageous embodiment of the signaling security system is characterized in that the AC signal source is a field element, in particular a traffic signal, and that the AC signal indicates the state of the field element, the state of the field element being a prerequisite, for example, for the output of an associated signal image .
  • Traffic signals are among the critical components of a signaling security system, so secure data transmission between a traffic signal and a processing unit of the signaling security system is particularly important.
  • the signal transmission device can reliably transmit signal information indicating whether the traffic signal indicates through its switching state that a train route is released or blocked.
  • the signal transmission device according to the invention can be used according to the invention to reveal errors in a safety-critical system.
  • faulty signals in the safety-critical system in particular in a signaling security system, are reliably detected, with the components in the signal transmission device being comparatively simply structured and inexpensive to manufacture.
  • Fig. 1 shows schematically a signaling security system 1, in which an AC signal source 2 transmits an AC signal through lines 13a, 13b, 13c, 13d, via a signal transmission device 3 to a processing unit 4, for example a signal box.
  • the AC signal source 2 can be, for example, a field element of the signaling security system 1, for example a traffic signal or an axle counting point, from which the AC signal is to be transmitted to the processing unit 4.
  • the AC signal arrives via two input lines 13a, 13b from the AC signal source 2 into an input circuit 6 of the signal transmission device 3.
  • the input circuit 6 has two transmitting parts 7a, 7b of a first and a second coupling element 8a, 8b , the coupling elements 8a, 8b transmit the AC signal to an output circuit 9 .
  • the input circuit 6 and the output circuit 9 are galvanically isolated from one another, which is indicated by a dashed line GT1 between the input circuit 6 and the output circuit 9.
  • the input circuit 6 is designed in this way (cf. Fig. 2 ), that the first coupling element 8a transmits a first partial signal of the AC signal, while the second coupling element 8b transmits a second partial signal of the AC signal.
  • the output circuit 9 is formed with a first output channel 10a and a second output channel 10b , which have receiving parts 11a, 11b of the first and second coupling elements 8a, 8b.
  • Each partial signal of the AC signal is transmitted for processing and output from the signal transmission device 3 through the coupling elements 8a, 8b into one of the output channels 10a, 10b.
  • the output channels 10a, 10b are galvanically isolated from one another, which is indicated by a further dashed line GT2 .
  • the partial signals become from the output channels 10a, 10b via output lines 13c, 13d to the processing unit 4, whereby the partial signals can be compared with one another by an evaluation unit 23 (here: within the processing unit (4)) in order to avoid possible errors in the transmission of the AC signal find.
  • the partial signals can be reassembled to form an overall signal.
  • Fig. 2 shows schematically a circuit diagram of the signal transmission device 3.
  • the signal transmission device 3 is designed with the input circuit 6, the input circuit 6 comprising a first input channel 14a and a second input channel 14b .
  • the input channels 14a, 14b both run from a first signal input 15a to a second signal input 15b of the signal transmission device 3, to which the poles of the AC signal source 2 are connected (see Fig. 1 ).
  • the first input channel 14a is used to record the first partial signal of the AC signal
  • the second input channel 14b is designed to record the second partial signal of the AC signal.
  • the first sub-signal of the AC signal is a portion of the AC signal with a first polarity
  • the second sub-signal is a portion of the AC signal with a second polarity that is opposite to the first polarity.
  • the two partial signals follow one another alternately when the AC signal is transmitted and are in particular designed as half waves.
  • the coupling elements 8a, 8b are activated alternately in the sequence of the partial signals of the AC signal in order to feed the respective partial signal of the AC signal from the input circuit 6 into the output circuit 9.
  • the signal transmission device 3 has the output circuit 9, the input circuit 6 and the output circuit 9 being galvanically isolated, which is indicated by the dashed line GT1.
  • the first input channel 14a has three electrical resistors 16a, 16b, 16c connected in series in the direction from the first signal input 15a to the second signal input 15b to avoid short circuits and for voltage regulation, with at least two of the resistors 16a, 16b, 16c of the first Input channel 14a differ in at least one parameter, especially in their lifespan.
  • the different parameters prevent several or all resistors 16a, 16b, 16c from failing at the same time, which can lead to damage to the signal transmission device 3 and distortion of the AC signal to be transmitted due to the change in the current flow through the first input channel 14a.
  • the three resistors 16a, 16b, 16c are followed by the transmitting part 7a of the first coupling element 8a, which is connected in series with the resistors 16a, 16b, 16c, here in the form of a first optocoupler, wherein the transmitting part 7a is designed here as a light-emitting diode or laser diode and the associated receiving part 11a of the first optocoupler 8a is designed here in the form of a phototransistor.
  • the receiving part 11a is part of the first output channel 10a of the output circuit 9. In the embodiment shown, the receiving part 11a of the first optocoupler 8a is at a reference potential (here: ground).
  • a first collector voltage is present at a resistor 16g on the receiving part 11a of the first optocoupler 8a.
  • the first optocoupler 8a enables the first partial signal of the AC signal to be transmitted into the first output channel 10a, with the first input channel 14a and the first output channel 10a being galvanically isolated from one another.
  • a protective diode 18a is connected in parallel with the transmitting part 7a of the first optocoupler 8a.
  • voltage direction-dependent electronic switching devices 19a, 19b, 19c are connected in series in the first input channel 14a in the direction from the first signal input 15a to the second signal input 15b after the transmitting part 7a of the first optocoupler 8a.
  • These voltage direction-dependent electronic switching devices 19a, 19b, 19c are designed as rectifier diodes, with at least two of the rectifier diodes 19a, 19b, 19c differing in at least one parameter, in particular in their service life.
  • the rectifier diodes 19a, 19b, 19c are aligned with their forward direction towards the second signal input 15b and ensure that only the first partial signal of the AC signal flows through the first input channel 14a, but the second partial signal of the AC signal is blocked.
  • the first input channel 14a is therefore only at one of the two polarities the AC signal source 2 (see Fig. 1 ) activated.
  • the different characteristics of the rectifier diodes 19a, 19b, 19c prevent the rectifier diodes 19a, 19b, 19c from failing at the same time. In particular, it is prevented that current can flow through the first input channel 14a at both polarities of the AC signal source 2 and that the AC signal to be transmitted is distorted.
  • the second input channel 14b has, corresponding to the first input channel 14a, in the direction from the second signal input 15b to the first signal input 15a, three series-connected resistors 16d, 16e, 16f , to which the transmitting part 7b of the second coupling element 8b in the form of a second optocoupler 8b follows.
  • the second optocoupler 8b serves to couple the second partial signal, the polarity of which is opposite to the first partial signal of the AC signal, into the second output channel 10b of the output circuit 9 via the receiving part 11b of the second optocoupler 8b.
  • the receiving part 11b of the second optocoupler 8b is at a reference potential (here: ground), whereby the reference potential of the receiving part 11b of the second optocoupler 8b can differ from the reference potential of the receiving part 11a of the first optocoupler 8a.
  • a second collector voltage which can in particular be identical to the first collector voltage, is present at the resistor 16h on the receiving part 11b of the second optocoupler 8b.
  • the second partial signal is coupled in by the second optocoupler 8b with galvanic isolation of the second input channel 14b from the second output channel 10b.
  • the transmitting part 7b of the second optocoupler 8b is protected from overvoltages by a second protective diode 18b connected in parallel.
  • the transmitting part 7b of the second optocoupler 8b is connected in the direction from the second signal input 15b to the first signal input 15a by three series-connected voltage direction-dependent electronic switching devices 19d, 19e, 19f in the form of rectifier diodes, which have the forward direction towards the first signal input 15a are aligned.
  • the rectifier diodes 19a, 19b, 19c of the first input channel 14a on the one hand and the rectifier diodes 19d, 19e, 19f of the second input channel 14b on the other hand are of opposite polarity to the AC signal source 2 (see Fig. 1 ) electrically connected.
  • the AC signal source 2 see Fig. 1
  • At least two of the resistors 16d, 16e, 16f of the second input channel 14b differ in at least one parameter, in particular the service life.
  • at least two of the rectifier diodes 19d, 19e, 19f of the second input channel 14b differ in at least one characteristic. This prevents the resistors 16d, 16e, 16f or the rectifier diodes 19d, 19e, 19f from failing at the same time, which would distort the AC signal to be transmitted.
  • each electrical resistance 16a, 16b, 16c of the first input channel 14a preferably correspond to the characteristics of each electrical resistance 16d, 16e, 16f of the second input channel 14b. Accordingly, the characteristics of each voltage direction-dependent electronic switching device 19a, 19b, 19c, here in the form of the rectifier diodes 19a, 19b, 19c, of the first input channel 14a preferably match the characteristics of each voltage direction-dependent electronic switching device 19d, 19e, 19f of the second input channel 14b. Furthermore, the characteristics of the first and second optocouplers 8a, 8b also preferably match. By choosing similar components in the input channels 14a, 14b, it is possible that the same input signals in the input channels 14a, 14b lead to the same transmission signals, which are transmitted by the optocouplers 14a, 14b.
  • the transmitting part 7a of the first optocoupler 8a emits a light signal, the course of which follows the first partial signal of the AC signal.
  • the receiving part 11a of the first optocoupler 8a converts the light signal emitted by the transmitting part 7a of the first optocoupler 8a back into a voltage, the course of which represents the first partial signal of the AC signal.
  • the voltage generated in the transmitting part 7a of the first optocoupler 8a can be tapped from the outside at a first output 21a of the first output channel 10a in order to transmit the first partial signal of the AC signal to an external system, in particular to a processing unit.
  • the transmitting part 7b of the second optocoupler 8b emits a light signal, the course of which follows the second partial signal of the AC signal.
  • the receiving part 11b of the second optocoupler 8b converts the light signal emitted by the transmitting part 7b of the second optocoupler 8b back into a voltage, the course of which reflects the second partial signal of the AC signal.
  • the voltage generated in the transmitting part 7b of the second optocoupler 8b can be tapped from the outside at a first output 22a of the second output channel 10b in order to transmit the second partial signal of the AC signal into an external system.
  • the two partial signals of the AC signal transmitted in this way can be reassembled into an overall signal after transmission or compared with one another with regard to errors during transmission (in particular due to defective components of the signal transmission device 3).
  • a transmitting part 7c of a third coupling element 8c is arranged in the form of a third optocoupler 8c , which emits a light signal whose course follows the voltage applied to the receiving part 11a of the first optocoupler 8a.
  • This signal is received by a receiving part 11c of the third optocoupler 8c, which is arranged in the second output channel 10b. Since the voltage at the receiving part 11a of the first optocoupler 8a follows the first partial signal of the AC signal, the signal transmitted by the third optocoupler 8c forms the first partial signal of the AC signal.
  • the first partial signal of the AC signal is also transmitted into the second output channel 10b and can be tapped there at a second output 22b of the second output channel 10b.
  • the second collector voltage is preferably present at a resistor 16j on the third optocoupler 8c.
  • a transmitting part 7d of a fourth coupling element 8d in the form of a fourth optocoupler 8d is arranged in the second output channel 10b near the first output channel 10a, the transmitting part 7d emitting a light signal, the course of which follows the voltage applied to the receiving part 11b of the second Optocoupler 8b is present.
  • This signal is received by a receiving part 11d of the fourth optocoupler 8d, the receiving part 11d is arranged in the first output channel 10a. Since the voltage at the receiving part 11b of the second optocoupler 8b follows the second partial signal of the AC signal, the signal transmitted by the fourth optocoupler 8d forms the second partial signal of the AC signal.
  • the second partial signal of the AC signal is also transmitted into the first output channel 10a and can be tapped there at a second output 21b of the first output channel 10a.
  • the first collector voltage is preferably present at a resistor 16i on the fourth optocoupler 8d.
  • the partial signals tapped at the outputs 21a, 21b of the first output channel 10a can be compared with one another using an evaluation unit (not shown).
  • the partial signals tapped at the outputs 22a, 22b of the second output channel 10b can be compared with one another using the evaluation unit.
  • the first output channel 10a and the second output channel 10b are grounded so that the signals transmitted in the third and fourth optocouplers 8c, 8d do not influence each other.
  • the first and second partial signals are coupled from one output channel 10a, 10b into the other output channel 10a, 10b by the third and fourth optocouplers 8c, 8d with galvanic isolation of the output channels 10a, 10b (represented by the dashed line GT2 ) to prevent interference potential between the output channels 10a, 10b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
EP22188972.8A 2022-08-05 2022-08-05 Dispositif de transmission de signal d'une installation technique de sécurité de signal destiné à la transmission sécurisée d'un signal ca Pending EP4316945A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338490A1 (de) * 1983-10-22 1985-05-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur ueberwachung des betriebszustandes von in der aussenanlage eines stellwerks eingesetzten wechselstromverbrauchern
WO2008090130A1 (fr) * 2007-01-26 2008-07-31 Siemens Aktiengesellschaft Procédé et système de commande et de surveillance d'éléments sur le terrain
CN105759204A (zh) 2016-04-15 2016-07-13 上汽通用汽车有限公司 车用交流充电装置的诊断电路及诊断方法
WO2020210321A1 (fr) * 2019-04-08 2020-10-15 Metrom Rail, Llc. Procédés et systèmes pour accomplir une commande vitale de train à base de bande ultralarge (uwb)

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338490A1 (de) * 1983-10-22 1985-05-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur ueberwachung des betriebszustandes von in der aussenanlage eines stellwerks eingesetzten wechselstromverbrauchern
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