CN113223895B

CN113223895B - Output safety control circuit of relay

Info

Publication number: CN113223895B
Application number: CN202010070332.2A
Authority: CN
Inventors: 陈庆; 酉佳; 胡淼
Original assignee: Zhuzhou CRRC Times Electric Co Ltd
Current assignee: Zhuzhou CRRC Times Electric Co Ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2022-08-12
Anticipated expiration: 2040-01-21
Also published as: CN113223895A

Abstract

The invention provides an output safety control circuit of a relay, which is suitable for outputting key signals of a maglev train, and comprises the following components: the switch module responds to the closing of the switch module, and a power supply loop of the coil is conducted; the output power supply module is connected with an output contact of the relay, and further comprises a fault feedback end and an enabling end, wherein the fault feedback end outputs a fault feedback signal in response to the fault of the output power supply module, and the output end of the output power supply module outputs the key signal in response to the enabling end receiving the enabling signal; and the control module is used for controlling the switch module to be closed, receiving the feedback signal of the feedback contact, receiving the fault feedback signal generated by the fault feedback end of the output power supply module and sending an enabling signal to the output power supply module so that the output end of the output power supply module generates the key signal.

Description

Output safety control circuit of relay

Technical Field

The invention relates to the field of train control, in particular to an output safety control circuit of a relay for transmitting key signals.

Background

The common safety state interlocking system mainly adopts two modes of series connection and cascade connection. The cascade mode is that the output of each node is connected in series, and the output of the previous node is used as the input of the next node. The tandem mode safety chain is mostly applied to simple safety control loops with few nodes. In the field of rail transit, the number of equipment nodes is large, and a cascade mode safety loop is mostly adopted.

In a suspension and guidance control system of a magnetic suspension vehicle, safety-related key signals such as suspended signals and/or guided signals are connected into a safety loop of the whole vehicle in a cascade mode. Each suspension frame in turn transmits the "suspended" and/or "guided" signals to the next suspension frame, and the vehicle is allowed to start only if the "suspended" and "guided" signals of each suspension frame are enabled and the safety computer receives the "suspended" and "guided" signals of the entire vehicle.

If the 'suspended' and/or 'guided' signals are in malfunction because of the failure of the controller, the suspended guide is in a failure condition, but the safety computer still receives the 'suspended' and 'guided' signals of the whole vehicle, the vehicle is still allowed to run, and serious safety accidents can be caused. Therefore, to ensure system safety, a safety output circuit is used for critical signals such as "floated" and "guided" to prevent malfunction.

At present, the digital output circuit used for 'suspended' and 'guided' generally adopts a single-level control relay output, and the scheme has potential safety defects. When the processor runs away, is electrified or is restarted and other indefinite states, an error level is easy to generate, and the relay outputs the safety signal in a false action mode. If the relay fails, such as the electric shock is stuck, the safety signal is output by mistake. Once a false output occurs, a serious safety accident may be caused.

In order to solve the above problems, the present invention is directed to an output safety control circuit of a relay for transmitting a key signal, so as to implement a plurality of levels of protection measures for outputting a floating and guiding safety signal, and ensure that the floating and guiding signals are not output by false actions under any fault condition.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

According to an aspect of the present invention, there is provided an output safety control circuit of a relay, adapted for output of a critical signal of a magnetic-levitation train, the relay including a coil, an output contact and a feedback contact, the output contact and the feedback contact being closed in response to energization of the coil, the output safety control circuit including: the switch module is arranged in the power supply loop of the coil, and the power supply loop of the coil is conducted in response to the switch module being closed; the output power supply module is connected with the output contact, responds to the closing of the output contact, the relay outputs an output end electric signal of the output power supply module through the output contact, and further comprises a fault feedback end and an enabling end, responds to the fault of the output power supply module, the fault feedback end outputs a fault feedback signal, responds to the enabling end receiving the enabling signal, and the output end of the output power supply module outputs the key signal; and the control module is coupled with the feedback contact of the relay, the switch module and the fault feedback end and the enabling end of the output power module, and is used for controlling the switch module to be closed, receiving a feedback signal of the feedback contact, receiving a fault feedback signal generated by the fault feedback end of the output power module and sending an enabling signal to the output power module so that the output end of the output power module generates the key signal.

Further, the control module stops sending the enabling signal to the output power module in response to the switch module being in the off state and receiving the feedback signal of the feedback contact.

Further, the control module stops sending the enable signal to the output power module in response to receiving a fault feedback signal of the output power module.

Still further, the switch module includes: the two parallel switches are respectively connected in series in the power supply loops of the coils, and the power supply loops of the coils are conducted in response to the closing of one of the two parallel switches; and the square wave conversion unit is coupled with the control module to receive the control signal generated by the control module, converts the control signal generated by the control module into two paths of mutually opposite-phase square wave signals and is respectively used for controlling one of the two paths of parallel switches, so that at any moment during the control signal generated by the control module, any one of the two paths of parallel switches is closed.

Furthermore, the switch module further comprises a blocking AC unit, the two paths of mutually opposite-phase control signals converted by the square wave conversion unit act on the two paths of parallel switches through the blocking AC unit respectively, and the control module generates adaptive square wave control signals based on the conduction pulse width of the blocking AC unit to serve as the control signals.

Further, the double-circuit parallel switch includes first opto-coupler switch and second opto-coupler switch, the photic ware of first opto-coupler switch with the photic ware of second opto-coupler switch connect in parallel in the power supply loop of coil, the positive pole of the illuminator of first opto-coupler switch with the positive pole of the illuminator of second opto-coupler switch is coupled respectively to one of the double-circuit control signal that the switch control unit produced, the negative pole of the illuminator of first opto-coupler switch with the positive pole of the illuminator of second opto-coupler switch is coupled, the negative pole of the illuminator of second opto-coupler switch with the positive pole of the illuminator of first opto-coupler switch is coupled.

Furthermore, the output power module comprises an electromagnetic isolation unit and an electronic switch unit, the electronic switch unit comprises an enabling end and a fault feedback end, the enabling end and the fault feedback end are coupled with the control module through the electromagnetic isolation unit, the control module sends an enabling signal after isolation to the enabling end through the electromagnetic isolation unit, and the electronic switch unit sends a fault feedback signal after isolation to the control module through the electromagnetic isolation unit.

Furthermore, the magnetic suspension train comprises a plurality of suspension frames, each suspension frame comprises an output safety control circuit, the suspension frames are connected in a cascade mode, and a key signal output by an output contact of a relay of the previous suspension frame supplies power to a power supply loop of a coil of a relay of the next suspension frame.

Furthermore, the maglev train comprises a plurality of suspension frames, each suspension frame comprises an output safety control circuit therein, the suspension frames are connected in series, and each output safety control circuit further comprises: and the power supply module is used for supplying power to a power supply loop of a coil of the relay of the suspension frame where the power supply module is located.

Furthermore, the control module in each output safety control circuit controls the switch module to be closed in response to the suspension frame in which the control module meets the suspension condition.

Further, in response to the control module in each output safety control circuit working normally, the control module sends the enable signal to the output power supply module.

Drawings

The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings.

FIG. 1 is a schematic diagram of an output safety control circuit according to one aspect of the present invention;

FIG. 2 is a schematic diagram of another output safety control circuit according to one aspect of the present invention;

fig. 3 is a circuit diagram of an output safety control circuit according to an aspect of the present invention.

Detailed Description

The following description is presented to enable any person skilled in the art to make and use the invention and is incorporated in the context of a particular application. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to a wide range of embodiments. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

In the following detailed description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the practice of the invention may not necessarily be limited to these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the present invention.

The reader's attention is directed to all papers and documents which are filed concurrently with this specification and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference. All the features disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

Note that where used, the designations left, right, front, back, top, bottom, positive, negative, clockwise, and counterclockwise are used for convenience only and do not imply any particular fixed orientation. In fact, they are used to reflect the relative position and/or orientation between the various parts of the object. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It is noted that, where used, further, preferably, still further and more preferably is a brief introduction to the exposition of the alternative embodiment on the basis of the preceding embodiment, the contents of the further, preferably, still further or more preferably back band being combined with the preceding embodiment as a complete constituent of the alternative embodiment. Several further, preferred, still further or more preferred arrangements of the back tape of the same embodiment may be combined in any combination to form a further embodiment.

The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.

According to one aspect of the invention, an output safety control circuit of a relay is provided, which is suitable for outputting a safety signal of a magnetic-levitation train.

The general structure of the relay is illustrated by taking the relay 110 in fig. 1 as an example, and as shown in fig. 1, the relay 110 includes a coil 111, an output contact 112, and a feedback contact 113, and the opening and closing of the output contact 112 and the feedback contact 113 are affected by the coil 111. In response to the coil 111 not being energized, the output contact 112 and the feedback contact 113 are disconnected, and the circuit in which the output contact 112 and the feedback contact 113 are located cannot perform signal transmission; in response to the coil 111 being energized, the output contact 112 and the feedback contact 113 are closed, and the circuit in which the output contact 112 and the feedback contact 113 are located is capable of signal transmission.

In the output circuit of the safety signal of the magnetic-levitation train, generally, the line where the output contact 112 of the relay 110 is located is used for transmitting the key signal, and the line where the feedback contact 113 is located is used for transmitting the closing feedback signal of the relay 110. It will be appreciated that the close feedback signal can be used to indicate the actual state of the relay 110, such as information indicating whether the coil 111 is energized and/or whether the output contacts 112 are closed.

In one embodiment, the output safety control circuit includes a switch module 120, an output power module 130, and a control module 140.

The switch module 120 is disposed in the power supply circuit of the coil 111 of the relay 110, and is used for controlling the on/off of the power supply circuit of the coil 111. In response to the switch module 120 being closed, the supply circuit of the coil 111 is turned on; in response to the switch module 120 being open, the supply circuit of the coil 111 is open. As shown in fig. 1, the power supply loop of the coil 111 passes from its positive terminal "+" through the coil and the switching device 120 to its negative terminal "-", and the coil 111 is energized when the positive and negative terminals of the power supply loop have a supply voltage and the power supply loop is on.

The output power module 130 is used to supply power to the output contacts 112 to transmit the critical signals that the relay is designed to transmit through the output contacts 112. The positive output terminal of the output power module 130 is coupled to its positive terminal "+" through the output contact 112, and the negative output terminal of the output power module 130 is coupled to the negative terminal "-" of the output contact 112. The output power module 130 may include an enable terminal "EN" for receiving an enable signal, and a feedback terminal "FE", where when the enable terminal of the output power module has the enable signal, the positive output terminal and the negative output terminal of the output power module 130 output a key signal that the relay is designed to transmit; the feedback terminal "FE" is used to send a feedback signal, and when there is an abnormal condition, such as an overcurrent, an overvoltage, or a short circuit, etc., in the output power module 130, the feedback terminal outputs a fault feedback signal.

The control module 140 is coupled to the feedback contact 113 of the relay 110 for receiving a closing feedback signal of the relay 110 from the feedback contact 113. Conventionally, the terminal "1" of the feedback contact 113 is coupled to a power supply terminal, the terminal "2" of the feedback contact 113 is coupled to the control module 140, and when the feedback contact 113 is closed, the power supply terminal voltage (regarded as a closed feedback signal) can be transmitted to the control module 140 through the feedback contact 113.

The control module 140 is coupled to the switch module 120 and is used for controlling the switch module 120 to be closed or opened, so as to control the power supply loop of the coil 111 to be opened or closed. In some embodiments, the control module 140 may generate a control signal that controls the switch module 120 to close when it meets the condition for sending the critical signal. For example, when the output safety control circuit is used to output a "floated" signal of a car of a magnetic-levitation train, the control module 140 may send a control signal to the switch module 120 to control the switch module 120 to close in response to receiving the floating instruction and determining that the car has reached the set floating height.

The control module 140 is further coupled to an enable terminal "EN" and a feedback terminal "FE" of the output power module 130, and transmits an enable signal to the output power module 130 through the enable terminal "EN" and receives a fault feedback signal from the output power module 130 through the feedback terminal "FE". In some embodiments, when the control module 140 is in the normal state, an enable signal is sent to the output power module 130. The control module being in a normal state means that the control module has the capability to process all basic transactions configured for processing.

It is understood that, correspondingly, when the control module 140 itself is in a fault state, the enable signal enabling the output power module 130 cannot or is not generated.

Preferably, the control module 140 may also respond to a failure of any component in the output safety control circuit, and not generate an enable signal to enable the output power supply module 130, so that the output power supply module 130 does not output a critical signal.

Specifically, when the switch module 120 is in an open state, the power supply loop of the coil 111 of the relay 110 is in an open state, and if the feedback contact 113 of the relay 110 is in a closed state at this time, it indicates that an adhesion fault occurs in the switch module 120 or the feedback contact 113 of the relay 110, so the control module 140 may determine that the output safety control circuit has a fault in response to that a control signal for controlling the switch module 120 to be closed is not generated but a feedback signal transmitted from the feedback contact 113 of the relay is received, and stop outputting the enable signal for enabling the output power module 130, and then the output end of the output power module 130 does not output the critical signal any more.

When a fault condition such as overcurrent, overvoltage or short circuit occurs inside the output power module 130, the output power module 130 generates a fault feedback signal and sends the fault feedback signal to the control module 140 through the fault feedback terminal, the control module 140 can also stop outputting the enable signal enabling the output power module 130 in response to receiving the fault feedback signal generated by the output power module 130, and the output terminal of the output power module 130 does not output the critical signal any more.

Through the arrangement, the control module can protect the output of the key signals from the control module, the coil power supply loop of the relay and the switch contact of the relay at three levels, the action of mistakenly outputting the key signals is prevented, and the output reliability of the key signals is greatly improved.

Further, as shown in fig. 2, the switch module 120 may include a two-way parallel switch 121 and a square wave converting unit 122.

The two-way parallel switch 121 is two

parallel switches

1211 and 1212, respectively connected in series to the power supply loop of the coil 111. When any one

switch

1211 or 1212 of the two-way parallel switch 121 is closed, the power supply circuit of the coil 111 is conducted. When both

switches

1211 and 1212 of the two-way parallel switch 121 are open, the supply circuit of the coil 111 is open.

The square wave converting unit 122 is coupled to the control module 140 to receive the control signal generated by the control module 140, and converts the control signal generated by the control module 140 into two paths of mutually inverted square wave signals for controlling one

switch

1211 or 1212 of the two-path parallel switch 121, respectively, so that at any time during the control signal generated by the control module 140, either one 1211 or 1212 of the two-path parallel switches is closed.

It will be appreciated that closing either 1211 or 1212 of the two-way shunt switch may render the power supply loop of the coil 111 conductive. At this time, when power is supplied to the positive terminal and the negative terminal of the coil 111, the feedback contact 113 and the output contact 112 of the relay 110 are closed.

It is understood that the control signal generated by the control module 140 is a square wave signal set based on the frequency of the ac signal that can be passed through the inside of the switching module 120. The square wave converting unit 122 converts the square wave signal generated by the control module 140 into two paths of square wave signals with mutually opposite phases.

Correspondingly, the switch module 120 further includes a dc blocking ac unit 123, and the dc blocking ac unit 123 may implement only conducting the ac signal of the fixed frequency band through a combination of a capacitor and a resistor. The two mutually inverted square wave signals converted by the square wave converting unit 122 respectively act on one

switch

1211 or 1212 of the two-way parallel switch 121 through the dc blocking ac unit 123 to control the closing or conduction of one 1211 or 1212.

Suppose that: the two square wave signals converted by the square wave converting unit 122 are a first square wave signal and a second square wave signal, respectively, wherein the first square wave signal is in phase with the square wave signal generated by the control module 140, the first square wave signal is used for controlling the switch 1211, the second square wave signal is used for controlling the switch 1212, and when the square wave signal for controlling the

switch

1211 or 1212 is at a high level, the

switch

1211 or 1212 is in a closed state. It can be understood by those skilled in the art that since the first square wave signal and the second square wave signal are in opposite phase, when the square wave signal generated by the control module 140 is at a high level, the first square wave signal is at a high level, and the second square wave signal is at a low level, at this time, the switch 1211 is closed, and the power supply loop of the coil 111 is turned on through the switch 1211; when the square wave signal generated by the control module 140 is at a low level, the second square wave signal is at a high level, and the first square wave signal is at a low level, at this time, the switch 1212 is closed, and the power supply loop of the coil 111 is turned on through the switch 1212. Therefore, during the period when the control module 140 outputs the square wave signal, whether the output square wave signal is at a high level or a low level, one of the two-way parallel switch 121 is in a closed state, and the power supply loop of the coil 111 is in a conductive state.

Due to the limitation of the dc blocking ac unit 123 on the frequency of the conducted square wave signal, the control signal can act on the two-way parallel switch 121 through the dc blocking ac unit 123 only when the square wave signal generated by the control module 140 is in the frequency band of the ac signal conducted by the dc blocking ac unit 123. Preferably, the control module 140 generates a corresponding square wave signal as the control signal of the switch module 120 based on the on pulse width of the dc blocking ac unit 123. Therefore, when the control module 140 is in an unstable state such as program runaway, power-on, or restart, an error level generated by the control module cannot pass through the dc-dc blocking unit 123, and therefore, the power supply line of the coil 111 cannot be switched on by mistake, and a key signal is output by mistake, so that the reliability of outputting the key signal output by the safety control circuit is further improved.

Further, the

switches

1211 and 1212 of the two-way parallel switch 121 may be opto-coupled switches, transistors or other electronic switches, etc. When different types of switches are employed, only the circuitry within the switch module 120 needs to be adapted.

The specific circuit configuration of the present invention will be described in detail by taking an optical coupling switch as an example.

In one embodiment, as shown in fig. 3, the two-way parallel switch 121 is composed of two opto-

coupler switches

1211 and 1212. The positive electrode of the light emitter D1 of the optocoupler switch 1211 is coupled to the first path of control signal generated by the square wave converting unit 122, the positive electrode of the light emitter D2 of the optocoupler switch 1212 is coupled to the second path of control signal generated by the square wave converting unit 122, the two light emitters D1 and D2 are connected in series, and the negative electrode of the light emitter D2 is coupled to the positive electrode of the light emitter D1. The light receiver K1 of the photocoupler switch 1211 and the light receiver K2 of the photocoupler switch 1212 are connected in series to the power supply circuit of the coil 111, respectively.

The dc blocking ac unit 123 includes a resistor R1 and a capacitor C1. The square wave converting unit 122 may be coupled to the control module 140 to receive the square wave signal generated by the control module 140 and convert the square wave signal into two control signals with mutually opposite phases, i.e., a first control signal S1 and a second control signal S2. Specifically, the first path of control signal S1 may be coupled to the anode of the light emitter D1 of the optical coupling switch 1211 through the resistor R1 of the dc blocking ac unit 123, and the second path of control signal S2 may be coupled to the anode of the light emitter D2 of the optical coupling switch 1212 through the capacitor C1 of the dc blocking ac unit 123.

Because the first path of control signal and the second path of control signal are in opposite phase, when the first path of control signal is at a high level, the second path of control signal is at a low level, the current passes through the branch where the first path of control signal is located, flows through the resistor R1 and the light emitter D1, and then returns to the branch where the second path of control signal is located to form a path, the optical coupling switch 1211 is turned on, the light receiver K1 of the optical coupling switch 1211 is turned on, and the coil 111 is turned on through the optical coupling switch 1211. When the first path of control signal is at a low level, the second path of control signal is at a high level, the current flows through the branch where the second path of control signal is located, the capacitor C1 and the light emitter D2, and then returns to the branch where the first path of control signal is located to form a path, the optical coupling switch 1212 is turned on, the light receiver K2 of the optical coupling switch 1212 is closed, and the power supply loop of the coil 111 is turned on through the optical coupling switch 1212.

It is understood that, in other embodiments, the first path control signal S1 may also be coupled to the anode of the light emitter D1 of the optical coupling switch 1211 through the capacitor C1 of the dc blocking ac unit 123, and the second path control signal S2 may also be coupled to the anode of the light emitter D2 of the optical coupling switch 1212 through the resistor R1 of the dc blocking ac unit 123.

Further, the square wave converting unit 122 may use the square wave signal generated by the control module 140 as a first path of control signal (a second path of control signal), and then use the square wave signal generated by the control module 140 as a corresponding second path of control signal (a first path of control signal) after inverting the phase of the square wave signal by using an inverter, so that the generation of the two-path control signal of the two-path parallel switch 121 may be realized.

Preferably, in order to prevent the square wave signal output from the signal output terminal of the control module 140 from being affected by the internal circuit of the square wave converting unit 122 or the two-way parallel switch 121, an inverter may be added to isolate the output signal of the signal output terminal of the control module 140. As shown in fig. 3, the output terminal of the control module 140 is coupled to the input terminal of a first inverter F1, the output terminal of the first inverter F1 is coupled to one terminal of a capacitor C1, the other terminal of the capacitor C1 is coupled to the anode of the light emitter D2 of the optocoupler switch 1212, the output terminal of the first inverter F1 is further coupled to the input terminal of a second inverter F2, the output terminal of the second inverter F2 is coupled to one terminal of a resistor R1, and the other terminal of the resistor R1 is coupled to the anode of the light emitter D1 of the optocoupler switch 1211. The square wave signal generated by the control module 140 passes through the first inverter F1 and then is input to the anode of the light emitter D2 of the optical coupling switch 1212 as the second path control signal S2 through the capacitor C1, and the second path control signal S2 passes through the second inverter F2 and then is input to the anode of the light emitter D1 of the optical coupling switch 1211 as the first path control signal S1 through the resistor R1.

When the square wave signal output by the control module 140 is at a high level, the output end of the first inverter F1 is at a low level, the anode of the light emitter D2 of the optical coupler switch 1212, that is, the cathode of the light emitter D1 of the optical coupler switch 1211 is at a low level, the output end of the second inverter F2 is at a high level, at this time, the current passes through the resistor R1, the light emitter D1 of the optical coupler switch 1211, the capacitor C1 to the input end of the second inverter F2, the optical coupler switch 1211 is turned on, the light receiver K1 is turned on, and the power supply loop of the coil 111 is turned on through the light receiver K1 of the optical coupler switch 1211.

When the square wave signal output by the control module 140 is at a low level, the output end of the first inverter F1 is at a high level, the anode of the light emitter D2 of the optical coupler switch 1212 is at a high level, the output end of the second inverter F2 is at a low level, at this time, the current passes through the capacitor C1, the light emitter D2 of the optical coupler switch 1212, the resistor R1 reaches the output end of the second inverter F2, the optical coupler switch 1212 is turned on, the light receiver K2 is closed, and the power supply loop of the coil 111 is turned on through the light receiver K2 of the optical coupler switch 1212.

In a specific application, the control module 140 may be a controller or a processor of any suspension frame of the magnetic levitation train, and when the control module 140 determines that the controlled suspension frame is in the "suspended" and "guided" states through other mechanisms, the control module 140 is triggered to generate a corresponding square wave signal.

It can be understood that, although the square wave signal is taken as the control signal as an example, a person skilled in the art can understand that the output of the key signal for preventing the control module from being triggered by mistake in an unsteady state or a fault state can be realized as long as the control signal of the switch module 120 needs to satisfy a certain change rule instead of the control signal that can be generated by the false triggering of the electronic product.

More specifically, the output power module 130 may include an electronic switch unit 131, and the electronic switch unit 131 includes an enable terminal EN and a feedback terminal FE. The internal circuit structure of the electronic switch unit 131 can be simplified to a single-pole double-throw switch, a pin 1 of the single-pole double-throw switch is coupled to the end of the output terminal of the relay 110, a pin 2 of the single-pole double-throw switch is grounded, and a pin 3 of the single-pole double-throw switch is connected to a 24V power supply. When the enable terminal of the electronic switch unit 131 does not receive the enable signal, the 1 pin and the 2 pin of the single-pole double-throw switch are closed, and the output contact 112 of the relay 110 is grounded; when the enable terminal of the electronic switch unit 131 receives an enable signal, the 1 pin and the 3 pin of the single-pole double-throw switch are closed, the output contact 112 of the relay 110 is connected to a 24V power supply, and at this time, if the output contact 112 is closed, the output terminal of the output contact is at a high level of 24V, which can be used as a key signal to be output.

Preferably, the output power module 130 may further include an isolation unit 132. The isolation unit 132 is disposed between the control module 140 and the electronic switch unit 131, and is used for achieving electrical isolation between the control module 140 and the electronic switch unit 131. The enable signal generated by the control module 140 is sent to the enable terminal EN of the electronic unit 131 through the isolation unit, and the fault feedback signal of the feedback terminal FE of the electronic unit 131 is sent to the control module 140 through the isolation unit 132.

It can be understood that the electronic switch unit 131 further includes an overcurrent, overvoltage or undervoltage protection circuit, and when an overcurrent, overvoltage, undervoltage or other fault occurs inside the electronic switch unit 131, a fault feedback signal is generated in the electronic switch unit 131 and finally appears on the electrical signal at the feedback terminal FE.

Further, in particular applications, critical signals of the train, such as "levitated" and "guided" signals, may be transmitted in a cascaded or serial manner.

When key signals of a plurality of suspension frames of the train are transmitted in a cascade mode, the positive end of the output contact of the relay of the previous suspension frame is coupled with the positive end of the coil of the relay of the next suspension frame, the negative end of the output contact of the relay of the previous suspension frame is coupled with the negative end of the coil of the relay of the next suspension frame, or the negative ends of the output contact and the coil of the relay are both grounded.

Further, for the key signal output system connected in the cascade manner, only when the previous floating frame meets the output condition of the key signal, for example, the floating frame is suspended to the design height, the key signal in the output safety control circuit of the previous floating frame is output to the power supply terminal of the coil of the relay in the key signal output circuit of the next floating frame, at this time, if the control module of the next floating frame judges that the next floating frame meets the output condition of the key signal, the control signal is generated to control the switch module to be closed, the power supply circuit of the coil of the relay of the next floating frame is closed and the power supply terminal supplies power, therefore, the output contact and the feedback contact of the relay are closed, and the output power supply module may output the key signal of the next floating frame through the output contact of the relay.

Therefore, in the cascaded key signal output system, when the relay of the last stage of the suspension frame outputs the key signal, it can be determined that each suspension frame in the cascaded output system is in the state indicated by the key signal.

When the key signals of a plurality of suspension frames of the train are transmitted in a series connection mode, the positive ends of the output contacts of the relays of the plurality of suspension frames are connected in series, and the positive end and the negative end of the coil 111 of each relay 110 can be supplied with power through the power supply module of the output safety control circuit. For the key signal output system connected in series, the key signal output circuit of each floating frame can output the key signal when the respective floating frame meets the key signal output condition. Therefore, in the serial key signal output system, when all the suspension frames of the train output the key signal, it is necessary to determine that each suspension frame in the serial output system is in the state indicated by the key signal.

Those of skill in the art would understand that information, signals, and data may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits (bits), symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The various illustrative logical modules, and circuits described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. It is to be understood that the scope of the invention is to be defined by the appended claims and not by the specific constructions and components of the embodiments illustrated above. Those skilled in the art can make various changes and modifications to the embodiments within the spirit and scope of the present invention, and these changes and modifications also fall within the scope of the present invention.

Claims

1. An output safety control circuit for a relay adapted for output of critical signals of a magnetic levitation train, the relay including a coil, an output contact, and a feedback contact, the output contact and the feedback contact being closed in response to energization of the coil, the output safety control circuit comprising:

the switch module is arranged in the power supply loop of the coil, and the power supply loop of the coil is conducted in response to the switch module being closed;

the output power supply module is connected with the output contact, responds to the closing of the output contact, the relay outputs an output end electric signal of the output power supply module through the output contact, and further comprises a fault feedback end and an enabling end, responds to the fault of the output power supply module, the fault feedback end outputs a fault feedback signal, responds to the enabling end receiving the enabling signal, and the output end of the output power supply module outputs the key signal; and

a control module coupled to the feedback contacts of the relay, the switch module, and the fault feedback and enable terminals of the output power module,

the control module is used for controlling the switch module to be closed, receiving a feedback signal of the feedback contact, receiving a fault feedback signal generated by a fault feedback end of the output power supply module and sending an enabling signal to the output power supply module so that the output end of the output power supply module generates the key signal,

wherein the switch module comprises:

the two parallel switches are respectively connected in series in the power supply loops of the coils, and the power supply loops of the coils are conducted in response to the closing of one of the two parallel switches; and

the square wave conversion unit is coupled with the control module to receive the control signal generated by the control module, converts the control signal generated by the control module into two paths of mutually opposite-phase square wave signals and is respectively used for controlling one of the two paths of parallel switches, so that at any moment during the period that the control module generates the control signal, any one of the two paths of parallel switches is closed.

2. The output safety control circuit of claim 1, wherein the control module stops sending the enable signal to the output power module in response to the switch module being in the open state and receiving a feedback signal from the feedback contact.

3. The output safety control circuit of claim 1, wherein the control module stops sending the enable signal to the output power module in response to receiving a fault feedback signal for the output power module.

4. The output safety control circuit according to claim 1, wherein the switch module further includes a blocking ac unit, the two paths of mutually inverted control signals converted by the square wave converting unit are respectively applied to the two paths of parallel switches through the blocking ac unit, and the control module generates an adaptive square wave control signal based on the on pulse width of the blocking ac unit to serve as the control signal.

5. The output safety control circuit according to claim 1, wherein the two-way parallel switch comprises a first optical coupling switch and a second optical coupling switch, a light receiver of the first optical coupling switch and a light receiver of the second optical coupling switch are connected in parallel in a power supply loop of the coil, an anode of a light emitter of the first optical coupling switch and an anode of a light emitter of the second optical coupling switch are respectively coupled to one of the two-way control signals generated by the square wave conversion unit, a cathode of the light emitter of the first optical coupling switch is coupled to an anode of the light emitter of the second optical coupling switch, and a cathode of the light emitter of the second optical coupling switch is coupled to an anode of the light emitter of the first optical coupling switch.

6. The output safety control circuit according to claim 1, wherein the output power module includes an electromagnetic isolation unit and an electronic switch unit, the electronic switch unit includes an enable terminal and a fault feedback terminal, the enable terminal and the fault feedback terminal are coupled to the control module through the electromagnetic isolation unit, the control module sends an isolated enable signal to the enable terminal through the electromagnetic isolation unit, and the electronic switch unit sends an isolated fault feedback signal to the control module through the electromagnetic isolation unit.

7. The output safety control circuit according to claim 1, wherein the magnetic levitation train comprises a plurality of levitation frames, each levitation frame comprises an output safety control circuit therein, the plurality of levitation frames are connected in a cascade manner, and the key signal output by the output contact of the relay of the previous levitation frame supplies power to the power supply loop of the coil of the relay of the next levitation frame.

8. The output safety control circuit of claim 1, wherein the magnetic levitation train comprises a plurality of levitation frames, each levitation frame comprises an output safety control circuit therein, the plurality of levitation frames are connected in series, and each output safety control circuit further comprises:

and the power supply module is used for supplying power to a power supply loop of a coil of the relay of the suspension frame where the power supply module is located.

9. The output safety control circuit according to claim 7 or 8, wherein the control module in each output safety control circuit controls the switch module to close in response to the suspension frame in which the control module is arranged satisfying the suspension condition.

10. The output safety control circuit according to claim 7 or 8, wherein the control module sends the enable signal to the output power supply module in response to a control module in each output safety control circuit functioning normally.