Alternating current signal machine power supply circuit, method, chip, device and interlocking system

Abstract

The invention provides an alternating current signal machine power supply circuit, method, chip, device and interlocking system, and belongs to the technical field of electronic circuits, the alternating current signal machine power supply circuit comprises two alternating current signal machine modules which are redundant to each other, and the two alternating current signal machine modules are respectively connected with a signal machine through a back plug terminal board, a voltage regulation alarm unit and a distributor plate lightning protection unit; the two power supply modules are redundant to each other and are respectively connected to the two alternating current signal machine modules; and the two isolation control modules are respectively connected between the alternating current signal machine module and the back plug terminal board and are used for electrically isolating the power supply module from the back plug terminal board. A mutual-control isolation control loop is additionally arranged in an output loop of a driving power supply of each alternating-current signal machine module, and when the two alternating-current signal machine modules are switched, even if the first power supply is not cut off thoroughly, the second power supply can be connected back to the first power supply loop in series due to the fact that the isolation control loop cannot connect the power supply back to the first power supply loop, so that the two alternating-current signal machine modules are switched. Therefore, the phenomenon that the board card is burnt out due to short circuit is avoided.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to an AC signal power supply circuit, method, chip, device, and interlocking system. Background Technology

[0002] The AC signal module is one of the core components of the interlocking system. As an electronic execution unit, it controls and monitors the real-time status of the signal through an external lighting unit. As the execution presentation layer, the AC signal module interacts with the interlocking calculation layer via Ethernet, performs lighting operations according to commands issued by the interlocking calculation layer, and reflects the current status information of the signal to the interlocking calculation layer in real time.

[0003] like Figure 1 As shown, this is a conventional power supply scheme for AC signal modules in the prior art. Two AC signal modules are connected through a redundant network to exchange status and data, achieving redundant control. If one module fails, it can automatically switch to the other module. The interlocking system internally provides a DC 24V power supply for the control of the AC signal modules, and the power supply panel provides redundant dual power supplies for the drive unit of the AC signal modules. Figure 1 The central logic unit controls and selects one of the AC signal modules to send power to the back-end terminal block (according to the principle of redundant power supply, the power supplied to the back-end terminal block by the two AC signal modules is from different sources). The power is then sent to the voltage regulating alarm unit via the back-end terminal block, and then to the distribution panel surge protection unit via the voltage regulating alarm unit. Finally, the surge protection unit provides power to the outdoor signal. The direct control object of the AC signal module is the lighting unit, and the indirect control object is the signal. It is mainly used to implement lighting operations according to commands issued by the interlocking safety logic platform, as well as to collect and monitor the status of the signal, and upload the collected information to the interlocking safety logic platform and maintenance equipment. Each signal module contains a logic unit and a drive unit. The logic unit completes the signal application, communication interaction, control output, and data acquisition functions, and the safety-related parts are handled by this unit; the drive unit controls the AC signal.

[0004] In current AC signal power supply schemes, the two redundant AC signal modules are required to support redundant power supply according to railway signal power supply panel standards and Ministry of Transport regulations. When switching power from one AC signal module to the other to supply power to a downstream signal, it can occasionally happen that the second power supply to the second AC signal module is already connected before the first power supply is completely disconnected. This causes a short circuit between the two power supplies at the back-end terminal block. Because the two power supplies are not from the same source, the short circuit results in a momentary voltage spike due to their different phases. This can not only cause the AC signal's fuse to burn out but may also burn out the power supply panel, thus affecting the power supply to the entire station.

[0005] Even when two redundant AC signal modules are powered by two power supplies of the same phase, during switching operations, there is an occasional possibility that the second power supply to the second AC signal module has already been switched on before the first power supply has been completely disconnected. In this situation, the two power supplies to the two AC signal modules are short-circuited at the back-end terminal block. Although the two power supplies are of the same phase, they pass through different isolation transformers. Due to manufacturing processes and other issues, the two transformers may output voltages differently, resulting in a voltage difference between the two power supplies. This can create a circulating current in the entire circuit. While this situation will not cause the fuses of the AC signal modules to burn out, the entire power supply circuit may experience further erosion due to overcurrent, affecting power supply safety.

[0006] Therefore, how to avoid short circuits at the back-end terminal block when two redundant AC signal modules are powered by redundant power supplies has become an urgent technical problem to be solved. Summary of the Invention

[0007] This invention provides an AC signal power supply circuit, method, chip, device, and interlocking system to solve the defect in the prior art where a short circuit occurs at the back terminal block when two redundant AC signal modules are powered by redundant power supplies.

[0008] This invention provides an AC signal power supply circuit, comprising: The first AC signal module is connected to the signal via a back-plug terminal block, a voltage regulating alarm unit, and a distribution panel lightning protection unit, and is used to send control signals to the signal. The second AC signal module is connected to the signal device through the back-plug terminal block, the voltage regulating alarm unit, and the distribution panel lightning protection unit, and is used to send control signals to the signal device; the second AC signal module and the first AC signal module are redundant to each other; A first power supply module is connected to the first AC signal module and is used to supply power to the first AC signal module and the signal; The second power supply module is connected to the second AC signal module and is used to supply power to the second AC signal module and the signal; The first isolation control module is connected between the first AC signal module and the back plug terminal board, and is used to electrically isolate the first power module from the back plug terminal board. The second isolation control module is connected between the second AC signal module and the back plug terminal board, and is used to electrically isolate the second power module from the back plug terminal board.

[0009] According to an AC signal power supply circuit provided by the present invention, the first isolation control module includes a reverse diode.

[0010] According to an AC signal power supply circuit provided by the present invention, the first isolation control module further includes a two-terminal AC switch element, which is used to control the circuit between the first AC signal module and the back plug terminal board to disconnect when switching from the first power module to the second power module to supply power to the signal.

[0011] According to an AC signal power supply circuit provided by the present invention, the second isolation control module includes a reverse diode.

[0012] According to an AC signal power supply circuit provided by the present invention, the second isolation control module further includes a two-terminal AC switch element, which is used to control the circuit between the second AC signal module and the back plug terminal board to disconnect when switching from the second power module supplying power to the first power module supplying power to the signal.

[0013] The present invention also provides an AC signal power supply method, applied to the AC signal power supply circuit described above, the AC signal power supply method comprising: When switching from the first power module to the second power module, the first isolation control module controls the circuit between the first AC signal module and the back plug terminal block to be disconnected.

[0014] The present invention also provides an AC signal power supply method, applied to the AC signal power supply circuit described above, the AC signal power supply method comprising: When switching from the second power module to the first power module, the second isolation control module controls the circuit between the second AC signal module and the back plug terminal block to be disconnected.

[0015] The present invention also provides an AC signal power supply chip, which includes an AC signal power supply circuit as described in any of the above, or is configured to implement an AC signal power supply method as described in any of the above.

[0016] The present invention also provides an AC signal power supply device, which includes an AC signal power supply circuit as described in any of the above, or includes an AC signal power supply chip as described in the above, or is configured to implement an AC signal power supply method as described in any of the above.

[0017] The present invention also provides an interlocking system comprising an AC signal power supply circuit as described in any of the above, or comprising an AC signal power supply chip as described in the above, or configured to implement an AC signal power supply method as described in any of the above.

[0018] The present invention provides an AC signal power supply circuit, method, chip, device, and interlocking system. The AC signal power supply circuit includes a first AC signal module connected to the signal via a back-mounted terminal block, a voltage regulating alarm unit, and a distribution panel surge protection unit, used to send control signals to the signal; a second AC signal module connected to the signal via the back-mounted terminal block, the voltage regulating alarm unit, and the distribution panel surge protection unit, used to send control signals to the signal; the second AC signal module and the first AC signal module are redundant; a first power module connected to the first AC signal module, used to supply power to the first AC signal module and the signal; a second power module connected to the second AC signal module, used to supply power to the second AC signal module and the signal; a first isolation control module connected between the first AC signal module and the back-mounted terminal block, used to electrically isolate the first power module from the back-mounted terminal block; and a second isolation control module connected between the second AC signal module and the back-mounted terminal block, used to electrically isolate the second power module from the back-mounted terminal block. This invention adds an interconnected isolation control loop to the output circuit of the drive power supply of each AC signal module. With this isolation control loop, when switching between two AC signal modules, even if the first power supply is not completely disconnected, the second power supply will not be able to connect back to the first power supply circuit due to the isolation control loop. Conversely, if the second power supply is not completely disconnected, the first power supply will also be unable to connect back to the second power supply circuit due to the isolation control loop. This allows the redundant AC signal modules to support redundant power supply schemes and effectively avoids damage to the circuit boards due to short circuits, greatly improving the stability and reliability of the signal power supply scheme. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the conventional power supply scheme for the AC signal module provided by the present invention; Figure 2 This is a schematic diagram of the AC signal power supply circuit provided by the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] It should be noted that in the description of the embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0024] Figure 2 This is a schematic diagram of the AC signal power supply circuit provided by the present invention, as shown below. Figure 2 As shown, the method includes the following: The first AC signal module (AC signal module 1) is connected to the signal controller via a back-plug terminal block, a voltage regulating alarm unit, and a distribution panel lightning protection unit, and is used to send control signals to the signal controller; The second AC signal module (AC signal module 2) is connected to the signal controller via the back-plug terminal block, the voltage regulating alarm unit, and the distribution panel lightning protection unit, and is used to send control signals to the signal controller; the second AC signal module and the first AC signal module are redundant to each other; The first power module (AC220V module 1) is connected to the first AC signal module and is used to supply power to the first AC signal module and the signal. The second power module (AC220V module 2) is connected to the second AC signal module and is used to supply power to the second AC signal module and the signal. The first isolation control module is connected between the first AC signal module and the back plug terminal board, and is used to electrically isolate the first power module from the back plug terminal board. The second isolation control module is connected between the second AC signal module and the back plug terminal board, and is used to electrically isolate the second power module from the back plug terminal board.

[0025] like Figure 2As shown, two redundant power supplies (the first power module and the second power module) from the power supply panel provide signal drive power to two redundant AC signal modules (the first AC signal module and the second AC signal module). Each AC signal module is further divided into a logic unit and a drive unit. The logic unit controls and selects one of the AC signal modules to send power to the isolation control loop. After judgment, the isolation control loop sends power to the back-plug terminal block, then to the voltage regulation alarm unit, and finally to the distribution panel surge protection unit, which then provides power to the signal. Each signal module consists of a logic unit and a drive unit. The logic unit completes the signal application logic, communication interface, and safety control functions, and is responsible for the output of the isolation control loop, status acquisition, and safety protection. The drive unit controls the AC signal.

[0026] In this embodiment of the invention, the specific structure of the isolation control module is not limited. During implementation, the structures of the first and second isolation control modules can be determined based on actual requirements such as isolation level, signal transmission rate, power consumption, and cost budget. For example, opto-isolation, transformer isolation, magnetic coupling isolation, and capacitive isolation can be used. Furthermore, the structures of the first and second isolation control modules can be the same or different; no specific limitations are imposed here.

[0027] The AC signal power supply circuit provided in this embodiment of the invention includes a first AC signal module connected to the signal via a back-mounted terminal block, a voltage regulating alarm unit, and a distribution panel surge protection unit, used to send control signals to the signal; a second AC signal module connected to the signal via the back-mounted terminal block, the voltage regulating alarm unit, and the distribution panel surge protection unit, used to send control signals to the signal; the second AC signal module and the first AC signal module are redundant; a first power supply module connected to the first AC signal module, used to supply power to the first AC signal module and the signal; a second power supply module connected to the second AC signal module, used to supply power to the second AC signal module and the signal; a first isolation control module connected between the first AC signal module and the back-mounted terminal block, used to electrically isolate the first power supply module from the back-mounted terminal block; and a second isolation control module connected between the second AC signal module and the back-mounted terminal block, used to electrically isolate the second power supply module from the back-mounted terminal block. This invention adds an interconnected isolation control loop to the output circuit of the drive power supply of each AC signal module. With this isolation control loop, when switching between two AC signal modules, even if the first power supply is not completely disconnected, the second power supply will not be able to connect back to the first power supply circuit due to the isolation control loop. Conversely, if the second power supply is not completely disconnected, the first power supply will also be unable to connect back to the second power supply circuit due to the isolation control loop. This allows the redundant AC signal modules to support redundant power supply schemes and effectively avoids damage to the circuit boards due to short circuits, greatly improving the stability and reliability of the signal power supply scheme.

[0028] In an optional embodiment, the first isolation control module includes a reverse diode.

[0029] In this embodiment of the invention, a diode is a semiconductor device with two electrodes (anode and cathode), allowing current to flow in only one direction; this characteristic is called unidirectional conductivity. When the diode is forward biased (anode higher than cathode), it conducts; while when it is reverse biased (cathode higher than anode), ideally it is cut off, preventing current from flowing. The unidirectional conductivity of the diode is used to prevent current from flowing from the back-end terminal block to the first AC signal module, thereby preventing a short circuit between the power supplied by the first power module and the power supplied by the second power module at the back-end terminal block, or the formation of a circulating current, ensuring power supply safety.

[0030] In the specific implementation process, the anode of the diode in the first isolation control module is close to the first AC signal module, and the cathode is close to the back terminal block. When switching from powering the signal device from the first power module to the second power module, even if the first power module is not completely disconnected, the second power module will be unable to connect the power back to the first power module circuit because the first isolation control module has an inverting diode.

[0031] The AC signal power supply circuit provided in this embodiment of the invention includes an inverting diode in the first isolation control module. By utilizing the unidirectional conductivity of the diode, short circuits between the first power supply module and the second power supply module are avoided, effectively ensuring power supply safety. In addition, the diode has a simple structure and low cost, which can simplify the overall system structure and reduce manufacturing costs.

[0032] In an optional embodiment, the first isolation control module further includes a two-terminal AC switch element, which is used to control the circuit between the first AC signal module and the back plug terminal block to disconnect when switching from the first power module to the second power module supplying power to the signal.

[0033] In this embodiment of the invention, the two-terminal AC switch element is a component with two terminals capable of controlling the opening and closing of an AC circuit. The specific structure of the two-terminal AC switch element is not limited here; it can be configured according to actual usage requirements during implementation. For example, a mechanical relay that controls the switching state by electromagnet activation can be used, as can a solid-state relay that implements contactless switching functionality using semiconductor devices, or a magnetic latching relay, etc.

[0034] In this embodiment of the invention, when the power supply for the signal machine is switched from the first power module to the second power module, even if the first power module is not completely disconnected, the logic unit in the first AC signal machine module will control the two-terminal AC switching element in the first control module so that its own module, which is not completely disconnected, has no power output.

[0035] The AC signal power supply circuit provided in this embodiment of the invention includes a two-terminal AC switch element in the first isolation control module. When the AC signal module switches, the circuit between the first AC signal module and the back plug terminal board is disconnected, thereby avoiding the situation where the board is burned out due to short circuit, and further improving the stability and reliability of the signal power supply.

[0036] In an optional embodiment, the second isolation control module includes a reverse diode.

[0037] In this embodiment of the invention, a diode is a semiconductor device with two electrodes (anode and cathode), allowing current to flow in only one direction; this characteristic is called unidirectional conductivity. When the diode is forward biased (anode higher than cathode), it conducts; while when it is reverse biased (cathode higher than anode), ideally it is cut off, preventing current from flowing. The unidirectional conductivity of the diode is used to prevent current from flowing from the back-end terminal block to the first AC signal module, thereby preventing a short circuit between the power supplied by the first power module and the power supplied by the second power module at the back-end terminal block, or the formation of a circulating current, ensuring power supply safety.

[0038] In the specific implementation process, the anode of the diode in the second isolation control module is close to the second AC signal module, and the cathode is close to the back terminal block. When switching from powering the signal from the second power module to the first power module, even if the second power module is not completely disconnected, the first power module will be unable to connect the power back to the second power module circuit because of the inverting diode in the second isolation control module.

[0039] The AC signal power supply circuit provided in this embodiment of the invention includes an inverting diode in the second isolation control module. By utilizing the unidirectional conductivity of the diode, short circuits between the second power supply module and the first power supply module are avoided, effectively ensuring power supply safety. In addition, the diode has a simple structure and low cost, which can simplify the overall system structure and reduce manufacturing costs.

[0040] In an optional embodiment, the second isolation control module further includes a two-terminal AC switch element, which is used to control the circuit between the second AC signal module and the back plug terminal block to disconnect when switching from the second power module supplying power to the signal to the first power module supplying power to the signal.

[0041] In this embodiment of the invention, the two-terminal AC switch element is a component with two terminals capable of controlling the opening and closing of an AC circuit. The specific structure of the two-terminal AC switch element is not limited here; it can be configured according to actual usage requirements during implementation. For example, a mechanical relay that controls the switching state by electromagnet activation can be used, as can a solid-state relay that implements contactless switching functionality using semiconductor devices, or a magnetic latching relay, etc.

[0042] In this embodiment of the invention, when the power supply for the signal machine is switched from the second power module to the first power module, even if the second power module is not completely disconnected, the logic unit in the second AC signal machine module will control the two-terminal AC switching element in the second control module so that the module itself, which is not completely disconnected, has no power output.

[0043] The AC signal power supply circuit provided in this embodiment of the invention includes a two-terminal AC switch element in the second isolation control module. When the AC signal module switches, the circuit between the second AC signal module and the back plug terminal board is disconnected, thereby avoiding the situation where the board is burned out due to short circuit, and further improving the stability and reliability of the signal power supply.

[0044] In summary, the AC signal power supply circuit provided by this invention adds an isolation control module to each of the redundant AC signal modules. If the signal is currently powered by the first signal module, the logic unit controls the second AC signal module to power the signal. At this time, even without completely de-energizing the first circuit, the second AC signal module is already outputting power to the back terminal block. Because the logic control unit has sent a command to the isolation control module, the isolation control module has cut off the output of the first AC signal module, and there is no voltage at the output of the first AC signal module (front end of the reverse isolation diode). This ensures that even if the two AC signal modules are short-circuited, the signal will still be lit and function normally. If the signal is currently powered by the second signal module, the logic unit controls the AC signal module to power the first AC signal module. At this time, without completely de-energizing the second circuit, the first AC signal module is already outputting power to the back terminal block. Because the logic control unit has sent a command to the isolation control module, the isolation control module has cut off the output of the second AC signal module, and there is no voltage at the output of the second AC signal module (front end of the reverse isolation diode). This ensures that even if the two AC signal modules are short-circuited, the signal will still be lit and function normally.

[0045] Therefore, by adding an isolation control module controlled by a logic unit in the loop, it is possible to prevent the AC power supply at the back end of the control loop from flowing back to the input end of the AC signal module. It also prevents the output phenomenon caused by untimely power-off when the module itself needs to switch off. This allows the redundant AC signal modules to support not only redundant power supply but also power supply from different sources within the same phase. This effectively avoids the short-circuit risk caused by switching between redundant AC signal modules, while ensuring that each AC signal module can independently provide power to the back-end signal. This greatly improves the stability and reliability of the signal power supply scheme, achieves power supply stability, increases equipment lifespan and maintenance efficiency, and reduces equipment replacement frequency and operation and maintenance costs.

[0046] The AC signal power supply method provided in the embodiments of this application is described below. The AC signal power supply method described below is applied to the AC signal power supply device described in any of the embodiments above. The AC signal power supply method may include: When switching from the first power module to the second power module, the first isolation control module controls the circuit between the first AC signal module and the back plug terminal block to be disconnected.

[0047] The AC signal power supply method may further include: When switching from the second power module to the first power module, the second isolation control module controls the circuit between the second AC signal module and the back plug terminal block to be disconnected.

[0048] On the other hand, the present invention also provides an AC signal power supply chip, including an AC signal power supply circuit as described in any of the preceding claims, or configured to implement the AC signal power supply method as described above.

[0049] In another aspect, the present invention also provides an AC signal power supply device, including an AC signal power supply circuit as described in any of the preceding claims, or including an AC signal power supply chip as described above, or configured to implement an AC signal power supply method as described above.

[0050] In another aspect, the present invention also provides an interlocking system comprising an AC signal power supply circuit as described in any of the preceding claims, or comprising an AC signal power supply chip as described above, or configured to implement an AC signal power supply method as described above.

[0051] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power supply circuit for an AC signal controller, characterized in that, include: The first AC signal module is connected to the signal via a back-plug terminal block, a voltage regulating alarm unit, and a distribution panel lightning protection unit, and is used to send control signals to the signal. The second AC signal module is connected to the signal device through the back-plug terminal block, the voltage regulating alarm unit, and the distribution panel lightning protection unit, and is used to send control signals to the signal device; the second AC signal module and the first AC signal module are redundant to each other; A first power supply module is connected to the first AC signal module and is used to supply power to the first AC signal module and the signal; The second power supply module is connected to the second AC signal module and is used to supply power to the second AC signal module and the signal; The first isolation control module is connected between the first AC signal module and the back plug terminal board, and is used to electrically isolate the first power module from the back plug terminal board. The second isolation control module is connected between the second AC signal module and the back plug terminal board, and is used to electrically isolate the second power module from the back plug terminal board.

2. The AC signal power supply circuit according to claim 1, characterized in that, The first isolation control module includes a reverse diode.

3. The AC signal power supply circuit according to claim 2, characterized in that, The first isolation control module also includes a two-terminal AC switch element, which is used to control the circuit between the first AC signal module and the back plug terminal board to disconnect when switching from the first power module to the second power module.

4. The AC signal power supply circuit according to claim 1, characterized in that, The second isolation control module includes a reverse diode.

5. The AC signal power supply circuit according to claim 4, characterized in that, The second isolation control module also includes a two-terminal AC switch element, which is used to control the circuit between the second AC signal module and the back plug terminal board to disconnect when switching from the second power module to the first power module to power the signal.

6. A method for supplying power to an AC signal controller, characterized in that, The AC signal power supply circuit as described in claim 1, wherein the AC signal power supply method comprises: When switching from the first power module to the second power module, the first isolation control module controls the circuit between the first AC signal module and the back plug terminal block to be disconnected.

7. A method for supplying power to an AC signal controller, characterized in that, The AC signal power supply circuit as described in claim 1, wherein the AC signal power supply method comprises: When switching from the second power module to the first power module, the second isolation control module controls the circuit between the second AC signal module and the back plug terminal block to be disconnected.

8. An AC signal power supply chip, characterized in that, Includes an AC signal power supply circuit as described in any one of claims 1-5, or is configured to implement an AC signal power supply method as described in claim 6 or 7.

9. A power supply device for an AC signal machine, characterized in that, It includes an AC signal power supply circuit as described in any one of claims 1-5, or includes an AC signal power supply chip as described in claim 8, or is configured to implement an AC signal power supply method as described in claim 6 or 7.

10. An interlocking system, characterized in that, It includes an AC signal power supply circuit as described in any one of claims 1-5, or includes an AC signal power supply chip as described in claim 8, or is configured to implement an AC signal power supply method as described in claim 6 or 7.

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