CN114743830A - Signal switching circuit, method and system based on relay logic - Google Patents
Signal switching circuit, method and system based on relay logic Download PDFInfo
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- CN114743830A CN114743830A CN202210280989.0A CN202210280989A CN114743830A CN 114743830 A CN114743830 A CN 114743830A CN 202210280989 A CN202210280989 A CN 202210280989A CN 114743830 A CN114743830 A CN 114743830A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
- H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
Abstract
The invention relates to a signal switching circuit, a method and a system based on relay logic, wherein the signal switching circuit comprises a first relay and a second relay, the first relay is connected with a first control signal sending device, and the second relay is connected with the first relay; the first relay is used for being disconnected with the second relay after being electrified and receiving a first control signal sent by the first control signal generating equipment; the second relay is connected with the second control signal transmitting equipment and the safety code signal transmitting equipment; the safety code signal sending device is used for sending a safety code signal to the safety code signal sending device; the second relay is also used for receiving the safety code signal sent by the safety code signal sending equipment after power failure. The signal switching circuit can realize that the first control signal, the second control signal and the third control signal are respectively and independently output.
Description
Technical Field
The invention belongs to the field of electronic circuits, and particularly relates to a signal switching circuit, method and system based on relay logic.
Background
In the field of railway communication, signal code sending equipment for controlling a train is generally arranged into a main system and a standby system which are mutually hot standby redundant, so that when the main system and the standby system are switched (for example, the main system fails), the main system and the standby system can be switched to the standby system in time to control the operation of the train, and the safety problem is avoided.
In order to realize the seamless switching between the main system and the standby system, the normal control signal output of the main system and the standby system is required to be ensured, when the main system works, only the control signal of the main system is output, and when the standby system is upgraded, the switching is changed into only the control signal of the standby system; and when the main and standby systems do not work at the same time, a safety code signal is required to be output to perform early warning.
Therefore, a signal switching output circuit is needed to be designed to realize the mutual isolation output of the main system control signal, the standby system control signal and the safety code signal, namely, when the main system and the standby system are switched, the main system control signal and the standby system control signal are switched and output; when the main and standby systems can not work normally, the independent output of the safety code signal is ensured.
Disclosure of Invention
In order to solve the above problems, the present invention provides a signal switching circuit, method and system based on relay logic.
The invention discloses a signal switching circuit based on relay logic, which comprises a first relay and a second relay,
the first relay is connected with first control signal sending equipment and the second relay; the first relay is used for being disconnected with the second relay after being electrified and receiving a first control signal sent by the first control signal generating equipment;
the second relay is connected with second control signal sending equipment and safety code signal sending equipment; the safety code signal sending equipment is used for receiving a second control signal sent by the second control signal sending equipment;
the second relay is also used for receiving the safety code signal sent by the safety code signal sending equipment after power failure.
Further, the first relay comprises a first normally closed node, a second normally closed node, a first normally open node and a second normally open node;
the first normally closed node is connected with the first normally open node;
the second normally closed node is connected with the second normally open node;
the first normally open node is used for connecting the first control signal sending equipment;
and the second normally open node is used for connecting the first control signal sending equipment.
Further, the first relay further comprises a fifth normally-open node for outputting the first control signal when the first relay is energized.
Furthermore, the first relay further comprises a sixth normally-open node, wherein the sixth normally-open node is a detection end of the first relay and is used for detecting whether the first relay is electrified or not by receiving a detection signal.
Further, the second relay comprises a third normally closed node, a fourth normally closed node, a third normally open node and a fourth normally open node;
the third normally-closed node is connected with the first normally-closed node;
the fourth normally-closed node is connected with the second normally-closed node;
the third normally open node is used for connecting the second control signal sending equipment;
the fourth normally open node is used for connecting the second control signal sending device.
Further, the air conditioner is provided with a fan,
the third normally closed node is used for connecting the security code signal sending equipment;
and the fourth normally closed node is used for connecting the safety code signal sending equipment.
Further, the second relay further comprises a seventh normally open node for outputting the second control signal.
Furthermore, the second relay further comprises an eighth normally-open node, wherein the eighth normally-open node is a detection end of the second relay and is used for detecting whether the second relay is electrified or not by receiving a detection signal.
Further, the first control signal sending device is a main code sending board; the second control signal sending equipment is a standby code sending board; the code sending board and the main code sending board are mutually isolated.
The invention also discloses a signal switching method of the signal switching circuit based on the relay logic, which comprises the following steps:
the first relay receives and outputs the first control signal when being electrified;
when the first relay is powered off and the second relay is powered on, the second relay receives and outputs the second control signal;
and when the first relay and the second relay are both powered off, the second relay receives and outputs the safety code signal.
The invention also discloses a signal switching system based on relay logic, which comprises a first control signal sending device, a second control signal sending device, a safety code signal sending device, a first relay and a second relay;
the first control signal sending equipment is connected with the first relay and sends a first control signal to the first relay;
the second control signal sending equipment is connected with the second relay and sends a second control signal to the second relay;
the safety code signal sending equipment is connected with the second relay and sends a safety code signal to the second relay;
the second relay receives and outputs the second control signal after being electrified; the second relay receives the safety code signal after power failure;
the first relay is disconnected from the second relay after being electrified, and receives the first control signal.
The invention relates to a signal switching circuit, a method and a system based on relay logic, wherein the signal switching circuit comprises a first relay and a second relay, the first relay is connected with a first control signal sending device, and the second relay is connected with the first relay; the first relay is used for being disconnected with the second relay after being electrified and receiving a first control signal sent by the first control signal generating equipment; the second relay is connected with the second control signal sending equipment and the safety code signal sending equipment; the safety code signal sending device is used for sending a safety code signal to the safety code signal sending device; the second relay is also used for receiving the safety code signal sent by the safety code signal sending equipment after power failure. The signal switching circuit can realize that the first control signal, the second control signal and the third control signal are respectively and independently output.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic diagram of a signal switching circuit based on relay logic according to an embodiment of the invention;
fig. 2 shows a signal switching circuit based on relay logic according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a signal switching circuit based on relay logic according to an embodiment of the present invention includes a first relay and a second relay;
fig. 1 is a schematic diagram of a signal switching circuit based on relay logic according to an embodiment of the present invention, and referring to fig. 1, a first relay includes a first normally-closed node 1 (including an upper pin 11 and a lower pin 12), a second normally-closed node 2 (including an upper pin 21 and a lower pin 22), a first normally-open node 5 (including an upper pin 54 and a lower pin 53), and a second normally-open node 6 (including an upper pin 64 and a lower pin 63); a lower pin 53 of the first normally-open node 5 and a lower pin 63 of the second normally-open node 6 are respectively used as a positive terminal and a negative terminal for inputting a first control signal;
the upper pin 54 of the first normally-open node 5 and the upper pin 64 of the second normally-open node 6 are respectively used as the anode and the cathode of a signal output end;
the upper pin 54 of the first normally-open node 5 is communicated with the lower pin 12 of the first normally-closed node 1, and the upper pin 64 of the second normally-open node 6 is communicated with the lower pin 22 of the second normally-closed node 2;
the second relay comprises a third normally-closed node 7 (comprising an upper pin 71 and a lower pin 72), a fourth normally-closed node 8 (comprising an upper pin 81 and a lower pin 82), a third normally-open node 11 (comprising an upper pin 114 and a lower pin 113) and a fourth normally-open node 12 (comprising an upper pin 124 and a lower pin 123); a lower pin 113 of the third normally open node 11 and a lower pin 123 of the fourth normally open node 12 are respectively used as a positive terminal and a negative terminal for inputting a second control signal;
the lower pin 72 of the third normally-closed node 7 and the lower pin 82 of the fourth normally-closed node 8 are respectively used as a positive terminal and a negative terminal for inputting safety code signals;
the upper pin 114 of the third normally-open node 11 is communicated with the upper pin 71 of the third normally-closed node 7; the upper pin 124 of the fourth normally-open node 12 is communicated with the upper pin 81 of the fourth normally-closed node 8;
the upper pin 11 of the first normally-closed node 1 is communicated with the upper pin 71 of the third normally-closed node 7, and the upper pin 21 of the second normally-closed node 2 is communicated with the upper pin 81 of the fourth normally-closed node 8.
When the signal switching circuit based on relay logic is applied to carry out signal switching output:
1) when first relay and the equal normal work of second relay, first relay and the equal circular telegram of second relay can guarantee to only export first control signal this moment, and can not export second control signal or safety code signal. Specifically, the method comprises the following steps:
when the first relay works normally, after power is supplied, the first normally open node 5 is closed, the second normally open node 6 is closed, the first normally closed node 1 is disconnected, and the second normally closed node 2 is disconnected;
when the second relay works normally, after power is supplied, the third normally-open node 11 is closed, the fourth normally-open node 12 is closed, the third normally-closed node 7 is disconnected, and the fourth normally-closed node 8 is disconnected;
at this time, the first relay may normally receive the first control signal, and the first control signal may be normally output from the upper pin 54 of the first normally-open node 5 and the upper pin 64 of the second normally-open node 6; since both the first normally-closed node 1 and the second normally-closed node 2 are in the off state, the security code signals input from the third normally-closed node 7 and the fourth normally-closed node 8 cannot be normally output, and the second control signals input from the lower pin 113 of the third normally-open node 11 and the lower pin 123 of the fourth normally-open node 12 cannot be normally output.
2) When the first relay normally works and the second relay does not work, the first relay is electrified, the second relay is powered off, and only the first control signal can be output at the moment. Specifically, the method comprises the following steps:
when the first relay works normally, the first control signal can be output normally;
when the second relay does not work, the third normally-open node 11 is disconnected, the fourth normally-open node 12 is disconnected, the third normally-closed node 7 is closed, and the fourth normally-closed node 8 is closed;
likewise, the second control signal and the security code signal cannot be normally output.
3) When the first relay does not work and the second relay works normally, the first relay is powered off, the second relay is powered on, and only the second control signal can be output. Specifically, the method comprises the following steps:
when the first relay does not work, the first normally-open node 5 is disconnected, the second normally-open node 6 is disconnected, the first normally-closed node 1 is closed, and the second normally-closed node 2 is closed; at the moment, the first control signal can not be normally output;
when the second relay works normally, a second control signal is input from a lower pin 113 of a third normally-open node 11 and a lower pin 123 of a fourth normally-open node 12, and reaches an upper pin 54 of a first normally-open node 5 and an upper pin 64 of a second normally-open node 6 through a first normally-closed node 1 and a second normally-closed node 2, so that the normal output of the second control signal is realized; but because the third normally-closed node 7 and the fourth normally-closed node 8 are both in an open state, the safety code signal cannot be normally output at this time.
4) When first relay and second relay do not all work, first relay outage, the outage of second relay can guarantee to only export the safety code signal this moment. Specifically, the method comprises the following steps:
when the first relay does not work, the first normally-open node 5 is disconnected, the second normally-open node 6 is disconnected, the first normally-closed node 1 is closed, and the second normally-closed node 2 is closed; at the moment, the first control signal cannot be normally output;
when the second relay does not work, the third normally-open node 11 is disconnected, the fourth normally-open node 12 is disconnected, the third normally-closed node 7 is closed, and the fourth normally-closed node 8 is closed;
at this time, neither the first control signal nor the second control signal can be received by the signal switching circuit of the present invention, but the security code signal may be input from the lower pin 72 of the third normally closed node 7 and the lower pin 82 of the fourth normally closed node 8, pass through the third normally closed node 7 and the fourth normally closed node 8, and reach the upper pin 54 of the first normally open node 5 and the upper pin 64 of the second normally open node 6 through the first normally closed node 1 and the second normally closed node 2, thereby realizing normal output of the security code signal.
As shown in fig. 1, ASK _ OUT1_1 and ASK _ OUT1_2 indicated at the upper pin 54 of the first normally open node 5 and the upper pin 64 of the second normally open node 6 represent the output of signals, including the first control signal, the second control signal or the security code signal.
The signal switching circuit based on the relay logic can realize that: 1. switching of the first control signal and the second control signal; 2. the first control signal, the second control signal and the safety code signal are independently output, so that the isolation of three signal channels is realized; 3. when the first control signal and the second control signal can not be received (the signal switching circuit can not output the first control signal or the second control signal), the normal output of the safety code signal is realized.
As shown in fig. 2, in a specific embodiment of the present application, a first control signal sending device is connected to a first normally open node 5 and a second normally open node 6 of a first relay, and specifically, the first control signal sending device is connected to a lower pin 53 of the first normally open node 5 and a lower pin 63 of the second normally open node 6, and is configured to send a first control signal to the first relay;
the second control signal sending device is connected with a third normally-open node 11 and a fourth normally-open node 12 of the second relay, and specifically, the second control signal sending device is connected with a lower pin 113 of the third normally-open node 11 and a lower pin 123 of the fourth normally-open node 12 and is used for sending a second control signal to the second relay;
the safety code signal sending device is specifically connected with the lower pin 72 of the third normally closed node 7 and the lower pin 82 of the fourth normally closed node, and in the embodiment, the safety code signal is an 80HZ signal (indicated as 80HZ + and 80HZ in fig. 2).
According to an embodiment of the present invention, the first relay further includes a fifth normally-open node 3 (including an upper pin 31 and a lower pin 32) and a sixth normally-open node 4 (including an upper pin 44 and a lower pin 43); the fifth normally open node 3 is used as an external channel control node of the first relay, the second relay further comprises a seventh normally open node 9 (comprising an upper pin 91 and a lower pin 92) and an eighth normally open node 10 (comprising an upper pin 104 and a lower pin 103), the seventh normally open node 9 is used as an external channel control node of the second relay, and the fifth normally open node 3 is communicated with the seventh normally open node 9. For realizing the output of the received signals: when the first relay is electrified and works normally, the fifth normally open node 3 outputs a first control signal, and when only the second relay is electrified and works normally, the seventh normally open node 9 outputs a second control signal. As shown in fig. 1 or fig. 2, in the present embodiment, the upper pin 31 and the lower pin 32 of the fifth normally-open node 3 are respectively used for connecting an OPCR1_1 terminal and an OPCR1_2 terminal of the external control unit, and the upper pin 91 and the lower pin 92 of the seventh normally-open node 9 are respectively used for connecting an OPCR2_1 terminal and an OPCR2_2 terminal of the external control unit, so as to output the first control signal, the second control signal or the security code signal to the external control unit.
And the sixth normally-open node 4 is used as a working judgment IO signal output node of the first relay. Specifically, as shown IN fig. 1, a 24V detection signal (schematically shown as +24V _ IN fig. 2) is input from the upper pin 44, and then whether the first relay is operating normally is determined according to the feedback result detected at the lower pin 43: when the feedback signal (shown as Z _ AQYM _ FB _1 in fig. 2) cannot be detected at the lower pin 43, it indicates that the sixth normally-open node 4 is in an off state, and the first relay is in an off state.
The eighth normally open node 10 is used as an operation judgment IO signal output node of the second relay, and specifically, as shown IN fig. 1, a 24V detection signal (illustrated as +24V _ IN fig. 2) is input from the upper pin 104, and then whether the second relay operates normally is judged according to a feedback result detected at the lower pin 103: when the feedback signal (shown as B _ AQYM _ FB _1 in fig. 2) cannot be detected at the lower pin 103, it indicates that the eighth normally-open node 10 is in an off state, and the second relay is in an off state.
Fig. 2 is another embodiment of the signal switching circuit based on relay logic according to the present invention, wherein the first relay further includes a voltage detection circuit, the voltage detection circuit includes a resistor R1 and a resistor R2, the resistor R1 is connected to the a1 terminal of the first relay control coil, and the resistor R2 is connected to the a2 terminal of the first relay control coil; whether the working environment state of the first relay meets the requirements of practical application scenarios is detected through the voltage detection circuit, and as shown in fig. 2, detection signals are represented as Z _ QHJ1_1 and Z _ QHJ1_2 in fig. 2.
The second relay also comprises a voltage detection circuit which comprises resistors R9 and R10: the resistor R9 is connected with the A3 terminal of the second relay control coil, and the resistor R10 is connected with the A4 terminal of the second relay control coil; whether the working environment state of the second relay is required by the actual application scene is detected by the voltage detection circuit, as shown in fig. 2, and the detection signals are represented as B _ QHJ1_1, B _ QHJ1_2 in fig. 2.
The invention also provides a signal switching system based on relay logic, which comprises first control signal sending equipment, second control signal sending equipment, safety code signal sending equipment, a first relay and a second relay;
the first relay and the second relay are connected to form the signal switching circuit;
the first control signal sending equipment is connected with the first relay and sends a first control signal to the first relay;
the second control signal sending equipment is connected with the second relay and sends a second control signal to the second relay;
the safety code signal sending equipment is connected with the second relay and sends a safety code signal to the second relay;
the second relay receives and outputs a second control signal after being electrified; the second relay receives the safety code signal after power failure;
the first relay is disconnected from the second relay after being electrified, and receives a first control signal.
The invention also provides a signal switching method based on relay logic, and the signal switching circuit based on the invention comprises the following steps:
the first relay receives and outputs a first control signal when being electrified;
when the first relay is powered off and the second relay is powered on, the second relay receives and outputs a second control signal;
when the first relay and the second relay are both powered off, the second relay receives the safety code signal and outputs the safety code signal.
In an actual application scenario of the relay logic-based signal switching circuit, method and system, a first control signal sending device is a main code sending board, and a second control signal sending device is a standby code sending board; the main code sending board is connected with an A1 terminal of the first relay control coil and an A2 terminal of the first relay control coil and used for controlling the action of the first relay; the main code sending board is connected with the lower pin 53 of the first normally-open node 5 and the lower pin 63 of the second normally-open node 6 at the same time and used for sending a first control signal to the first relay. The backup code board is connected with the A3 terminal of the second relay control coil and the A4 terminal of the second relay control coil and used for controlling the action of the second relay; the standby code board is connected with a lower pin 113 of a third normally open node 11 and a lower pin 123 of a fourth normally open node 12 at the same time, and is used for sending a second control signal to the second relay.
Referring to fig. 2, when the primary code transmitting board and the backup code transmitting board both work normally, the control signal switching between the primary and backup systems can be performed; when the main code sending board or the standby code sending board normally works, a control signal (a first control signal or a second control signal) is output through the main code sending board or the standby code sending board; when the main and standby systems can not work normally, the control signal can not be output, and the safety code signal sent by the safety code signal sending equipment can be output through the signal switching circuit, so that the driving safety of the train can be ensured.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A signal switching circuit based on relay logic is characterized by comprising a first relay and a second relay,
the first relay is connected with first control signal sending equipment and the second relay; the first relay is used for being disconnected with the second relay after being electrified and receiving a first control signal sent by the first control signal generating equipment;
the second relay is connected with second control signal sending equipment and safety code signal sending equipment; the safety code signal sending equipment is used for receiving a second control signal sent by the second control signal sending equipment;
the second relay is also used for receiving the safety code signal sent by the safety code signal sending equipment after power failure.
2. The relay logic based signal switching circuit according to claim 1, wherein the first relay includes a first normally closed node, a second normally closed node, a first normally open node, and a second normally open node;
the first normally closed node is connected with the first normally open node;
the second normally closed node is connected with the second normally open node;
the first normally open node is used for connecting the first control signal sending equipment;
and the second normally open node is used for connecting the first control signal sending equipment.
3. The relay logic based signal switching circuit according to claim 2, wherein the first relay further comprises a fifth normally open node for outputting the first control signal when the first relay is energized.
4. The relay logic based signal switching circuit according to claim 2, wherein the first relay further comprises a sixth normally open node, the sixth normally open node is a detection terminal of the first relay, and whether the first relay is energized or not is detected by receiving a detection signal.
5. The relay logic based signal switching circuit according to claim 2, wherein the second relay includes a third normally closed node, a fourth normally closed node, a third normally open node, and a fourth normally open node;
the third normally-closed node is connected with the first normally-closed node;
the fourth normally-closed node is connected with the second normally-closed node;
the third normally open node is used for connecting the second control signal sending equipment;
and the fourth normally open node is used for connecting the second control signal sending equipment.
6. The relay logic based signal switching circuit of claim 5,
the third normally closed node is used for connecting the security code signal sending equipment;
and the fourth normally closed node is used for connecting the safety code signal sending equipment.
7. The relay logic based signal switching circuit according to claim 5, wherein the second relay further comprises a seventh normally open node for outputting the second control signal.
8. The relay logic based signal switching circuit according to claim 5, wherein the second relay further comprises an eighth normally open node, the eighth normally open node is a detection terminal of the second relay, and whether the second relay is energized is detected by receiving a detection signal.
9. The relay logic based signal switching circuit of claim 1,
the first control signal sending equipment is a main code sending plate; the second control signal sending equipment is a standby code sending board; the code sending board and the main code sending board are mutually isolated.
10. The signal switching method of the signal switching circuit based on the relay logic according to any one of claims 1 to 9, comprising the steps of:
the first relay receives and outputs the first control signal when being electrified;
when the first relay is powered off and the second relay is powered on, the second relay receives and outputs the second control signal;
and when the first relay and the second relay are both powered off, the second relay receives and outputs the safety code signal.
11. A signal switching system based on relay logic is characterized by comprising a first control signal sending device, a second control signal sending device, a safety code signal sending device, a first relay and a second relay;
the first control signal sending equipment is connected with the first relay and sends a first control signal to the first relay;
the second control signal sending equipment is connected with the second relay and sends a second control signal to the second relay;
the safety code signal sending equipment is connected with the second relay and sends a safety code signal to the second relay;
the second relay receives and outputs the second control signal after being electrified; the second relay receives the safety code signal after power failure;
the first relay is disconnected from the second relay after being electrified, and receives the first control signal.
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| 程伟娟: "北京地铁5号线调试期间TCOM宕机的解决方案", 《铁路通信信号工程技术》, no. 12, pages 69 - 73 * |
| 高炜: "国产低频发码设备在北京地铁5号线信号系统中的应用", 《通信设计与应用》, no. 6, pages 7 - 8 * |
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| CN114743830B (en) | 2023-08-22 |
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