AC power supply branching control circuit and fault alarm system

Abstract

The utility model provides an AC power supply branching control circuit and a fault alarm system, and belongs to the technical field of power plant automation control, and the circuit comprises an input wiring terminal which is connected with an AC power supply, each power supply branching module carries out the branching of the AC power supply, and a fault alarm module collects the output voltage of each power supply branching module, and when the output voltage of a certain power supply branching module is zero, a fault signal is output and a single fault alarm is triggered, or when the output voltage of a plurality of power supply branching modules is zero, multiple paths of faults are integrated into one path of fault, the fault signal is output and a comprehensive fault alarm is triggered, and each group of output wiring terminals output power supply voltage to external loop equipment. According to the scheme, single fault alarm or comprehensive fault alarm can be triggered when the power supply loop fails.

Description

Technical Field

[0001] The present application relates to the technical field of power plant automation control, and in particular to an AC power distribution line control circuit and a fault alarm system. Background Art

[0002] Each voltage level should adhere to the principle of "dedicated power for dedicated use." Non-core loads such as cabinet fans, indicator lights, operation panels, maintenance power supplies, heating power supplies, and lighting power supplies are strictly prohibited. Cabinet fan power supplies, cabinet lighting power supplies, and temperature and humidity controller power supplies are considered non-core power supplies and must be independent of the DCS (Distributed Control System) power supply. A third power source must be introduced, providing independent control and protection.

[0003] Currently, existing technologies achieve this function by adding an air switch and a fuse terminal circuit to the cabinet's side beam. However, when a power circuit fails, the fault information cannot be displayed on the human-machine interface and a fault alarm cannot be triggered. Therefore, how to trigger a fault alarm when a power circuit fails remains an unresolved problem. Utility Model Content

[0004] The purpose of this application is to provide an AC power distribution line control circuit, which can solve the problem in the prior art that a fault alarm cannot be triggered when a power circuit fails.

[0005] In a first aspect, an embodiment of the present application provides an AC power line splitting control circuit, the circuit comprising: an input wiring terminal, a plurality of power line splitting modules, a fault alarm module, and a plurality of groups of output wiring terminals;

[0006] The input terminal is connected to the live wire and the neutral wire of the AC power supply. The live wire and the neutral wire are connected to the power voltage input terminal of each power distribution module. The input terminal is used to access the AC power supply;

[0007] The branch voltage output terminals and branch voltage input terminals of every two power branch modules are connected to the same set of output wiring terminals, and the power voltage input terminals of every two power branch modules are connected to the same set of output wiring terminals. The power branch modules are connected in series, the alarm output terminal of the first power branch module is connected to the first terminal of the fault alarm module, and the alarm output terminal of the last power branch module is connected to the second terminal of the fault alarm module. Each power branch module is used to branch the AC power supply; the first power branch module is the first power branch module connected to the live wire and the neutral wire at the power voltage input terminal, and the last power branch module is the last power branch module connected to the live wire and the neutral wire at the power voltage input terminal;

[0008] The fault alarm module is used to collect the output voltage of each power distribution module, output a fault signal when the output voltage of a power distribution module is zero, and trigger a single fault alarm; or when the output voltage of multiple power distribution modules is zero, it integrates multiple faults into one fault, outputs a fault signal, and triggers a comprehensive fault alarm;

[0009] Each group of output wiring terminals is also connected to the input end of the external loop device, and each group of output wiring terminals is used to output the power supply voltage to the external loop device.

[0010] In a possible implementation manner of the first aspect, the power voltage input terminal of each power distribution module includes: a live wire input terminal and a neutral wire input terminal, and the live wire input terminal of each power distribution module is provided with a shunt fuse and a shunt switch;

[0011] The first end of the shunt fuse is connected to the live wire of the input terminal, and the second end of the shunt fuse is connected to the first end of the shunt switch; the second end of the shunt switch is connected to the output terminal, and the second ends of every two shunt switches are connected to the same group of output terminals. The third end of the shunt switch is connected to the neutral wire of the input terminal; each shunt switch is provided with a power indicator light;

[0012] A main fuse and a main switch are provided on the live wire of the input terminal. The live wire of the input terminal is connected to the live wire input end of each power distribution module, and the neutral wire of the input terminal is connected to the neutral wire input end of each power distribution module. A power indicator light is provided on the main switch.

[0013] In a possible implementation of the first aspect, each power distribution module includes: a photoelectric coupler and at least one RC step-down unit; the RC step-down unit is connected in parallel with the photoelectric coupler and disposed between a first end and a second end of the photoelectric coupler, or the RC step-down unit is connected in series with the second end of the photoelectric coupler, and each RC step-down unit is configured to reduce a power supply voltage inputted from each power supply voltage input terminal to a threshold voltage of the photoelectric coupler;

[0014] The photoelectric couplers are connected in series, the fourth output end of the first photoelectric coupler is connected to the first end of the fault alarm module, the third end of the adjacent photoelectric coupler is connected to the fourth end, and the third end of the last photoelectric coupler is connected to the second end of the fault alarm module. Each photoelectric coupler is used to isolate the input electrical signal and the output electrical signal of the power distribution module.

[0015] In a possible implementation of the first aspect, the RC step-down unit connected in parallel with the photoelectric coupler includes: a resistor and a capacitor connected in parallel, wherein the resistor and the capacitor are arranged between the first end and the second end of the photoelectric coupler; the RC step-down unit connected in series with the photoelectric coupler includes: a resistor and a capacitor connected in parallel, wherein the first end of the capacitor is connected to the second end of the photoelectric coupler, and the second end of the capacitor is connected to the second end of the shunt switch.

[0016] In one possible implementation of the first aspect, the fault alarm module includes: a voltage regulator diode, a short-circuit switch, and a fault alarm terminal; the anode of the voltage regulator diode is connected to the alarm output terminal of the first power distribution module, the cathode of the voltage regulator diode is connected to the second interface of the fault alarm terminal, the first interface of the fault alarm terminal is connected to the alarm output terminal of the last power distribution module, and the voltage regulator diode is configured to step down and stabilize the voltage when a 48 VDC input is received by the fault alarm terminal;

[0017] The short-circuit switch is connected in parallel with the voltage regulator tube. When 24VDC is input to the fault alarm terminal, the short-circuit switch is closed to short-circuit the voltage regulator tube. When 48VDC is input to the fault alarm terminal, the short-circuit switch is opened to enable the voltage regulator tube to step down and stabilize the 48VDC.

[0018] In a possible implementation of the first aspect, the fault alarm module also includes: a switching tube and a filtering unit; the first end of the switching tube is connected to the second end of the filtering unit, the second end of the switching tube is connected to the cathode of the voltage regulator tube, and the third end of the switching tube is connected to the third end of the filtering unit; the first end of the filtering unit is connected to the alarm output end of the last power distribution module, and the filtering unit is used to filter the output voltage of each power distribution module.

[0019] In a possible implementation of the first aspect, the fault alarm module further includes a distributed control system, and the distributed control system is connected to the fault alarm terminal;

[0020] When the distributed control system detects that the output voltage of each power distribution module reaches the preset voltage, each photoelectric coupler connected in series is turned on, the switch tube is turned on, the fault alarm circuit of the fault alarm module is in a closed state, and the distributed control system outputs a normal signal;

[0021] When the branch switch of one or more power distribution modules is disconnected, or the branch fuse is blown, the photoelectric couplers in series are disconnected, the switch tube is cut off, the fault alarm circuit of the fault alarm module is in the disconnected state, and the distributed control system outputs a fault alarm signal to trigger the fault alarm.

[0022] In a possible implementation of the first aspect, the switching tube includes a transistor; the base of the transistor is connected to the second end of the filter unit, the collector of the transistor is connected to the cathode of the voltage regulator tube, and the emitter of the transistor is connected to the third end of the filter unit.

[0023] In a possible implementation of the first aspect, the filtering unit includes: a resistor (49) and a capacitor (C7); a first end of the resistor (49) and a first end of the capacitor (C7) are connected to the alarm output end of the last power distribution module, a second end of the resistor (49) is connected to the first end of the switch tube, and a second end of the capacitor (C7) is connected to the third end of the switch tube.

[0024] In a possible implementation of the first aspect, the fault alarm module also includes a current limiting unit; the first end of the current limiting unit is connected to the first interface of the fault alarm terminal, and the second end of the current limiting unit is connected to the alarm output end of the last power distribution module, and the current limiting unit is used to limit the current input to the fault alarm terminal.

[0025] In a possible implementation manner of the first aspect, the current limiting unit includes at least one current limiting resistor. When the current limiting unit includes multiple current limiting resistors, the multiple current limiting resistors are connected in series.

[0026] In a second aspect, an embodiment of the present application provides a fault alarm system, the system comprising: an AC power supply, a display screen, a fault alarm device, an external loop device, and the AC power distribution line control circuit of any one of the first aspects, the control circuit comprising a distributed control system;

[0027] The AC power supply is connected to the input terminal of the branch control circuit, the distributed control system is connected to the display screen, and the external loop equipment is connected to each group of output terminal of the branch control circuit;

[0028] The distributed control system is used to output a normal signal when it detects that the output voltage of each power distribution module reaches a preset voltage, or output a fault alarm signal to trigger a fault alarm when the branch switch of one or more power distribution modules is disconnected or the branch fuse is burned out;

[0029] The display screen is used to display a normal signal or a fault alarm signal; the fault alarm device is used to receive the fault alarm signal and perform a fault alarm based on the fault alarm signal.

[0030] In this application solution, the input terminal is connected to the AC power supply, and each power distribution module distributes the AC power. The fault alarm module collects the output voltage of each power distribution module, outputs a fault signal when the output voltage of a certain power distribution module is zero, and triggers a single fault alarm, or when the output voltage of multiple power distribution modules is zero, integrates multiple faults into one fault, outputs a fault signal, and triggers a comprehensive fault alarm. Each group of output terminal blocks outputs the power supply voltage to the external loop equipment.

[0031] The application solution can trigger a single fault alarm or a comprehensive fault alarm when a power circuit fails, and has strong ease of use and practicality.

[0032] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 is a schematic block diagram of the overall structure of the AC power line splitting control circuit provided in an embodiment of the present application;

[0035] Figure 2 is a schematic block diagram of the specific structure of the AC power line splitting control circuit provided in an embodiment of the present application;

[0036] Figure 3 It is a schematic block diagram of the fault alarm system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present application with unnecessary details.

[0038] It will be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0039] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0040] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0041] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0042] In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present invention. Thus, phrases such as "in one embodiment," "in some embodiments," "in some other embodiments," and "in some other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0044] In this application specification, unless otherwise stated, directional words such as "up, down, left, right" generally refer to the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the application is usually placed when in use.

[0045] It should also be noted that, in this specification, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this specification based on the specific circumstances.

[0046] Each voltage level should adhere to the principle of "dedicated power for dedicated use." Non-core loads such as cabinet fans, indicator lights, operation panels, maintenance power supplies, heating power supplies, and lighting power supplies are strictly prohibited. The DCS should have a reliable power failure alarm function. If either the external or internal power supply fails, the human-machine interface will display a fault message and trigger an alarm.

[0047] The cabinet fan power supply, cabinet lighting power supply, and temperature and humidity controller power supply are non-core power supplies and must be independent of the DCS power supply, necessitating the introduction of a third power source. Because the owner requires independent control and protection of the fan and lighting power supplies, the current conventional design implements this functionality by adding an air switch and fuse terminal circuit to the cabinet side beam.

[0048] The existing design is not beautiful and the installation and wiring are inconvenient. It is necessary to develop a power splitter that meets the requirements of being small and beautiful, easy to install, simple to maintain and fully functional.

[0049] Currently, existing technologies achieve this function by adding an air switch and a fuse terminal circuit to the cabinet's side beam. However, when a power circuit fails, the fault information cannot be displayed on the human-machine interface and a fault alarm cannot be triggered. Therefore, how to trigger a fault alarm when a power circuit fails remains an unresolved problem.

[0050] The existing device integration method has the following shortcomings:

[0051] (1) Inconvenient installation, and the on-site installation workload is large. The current equipment integration is non-standard size equipment. Since it needs to be installed in other equipment cabinets on site, the equipment manufacturer needs to carry out wiring integration in the factory in advance, such as on-site modification and on-site installation. Due to the large number of cabinets, the installation and wiring workload is large, and the on-site modification period is short, there is cross-operation, which is easy to affect the on-site installation.

[0052] (2) Unsightly, messy wiring, and many fault points. All circuit wiring needs to be completed by hard wiring, which requires more manual wiring and increases the number of fault points. Faults are difficult to troubleshoot, which is not conducive to debugging safety.

[0053] (3) Imperfect functions. When the power circuit fails, the fault information cannot be displayed on the human-machine interface to trigger the alarm (the original circuit has no alarm output signal contact. If the power fuse of the circuit is blown, the operator cannot monitor it on the display screen and cannot know the fault and deal with it in time).

[0054] (4) Low degree of integration. It is impossible to form a product and a formal product manual, which increases the difficulty of on-site installation, wiring, debugging, and maintenance, and is not conducive to future product promotion and application.

[0055] In response to the above-mentioned defects, an embodiment of the present application provides an AC power distribution control circuit, in which the input terminal is connected to the AC power supply, and each power distribution module distributes the AC power supply. The fault alarm module collects the output voltage of each power distribution module, and outputs a fault signal when the output voltage of a certain power distribution module is zero, triggering a single fault alarm, or when the output voltage of multiple power distribution modules is zero, multiple faults are integrated into one fault, and a fault signal is output to trigger a comprehensive fault alarm. Each group of output terminals outputs the power supply voltage to the external loop equipment.

[0056] The application solution can trigger a single fault alarm or a comprehensive fault alarm when a power circuit fails, and has strong ease of use and practicality.

[0057] The overall structure of the AC power line splitting control circuit provided in the embodiments of the present application is described below through specific embodiments.

[0058] See Figure 1 , Figure 1 FIG. 1 is a schematic block diagram of the overall structure of the AC power line control circuit 100 provided in an embodiment of the present application. Figure 1 As shown, the circuit includes: an input terminal 110, a plurality of power distribution modules (121-12n), a fault alarm module 130 and a plurality of output terminal groups (141-14n) (J1-Jn).

[0059] In one embodiment, the input terminal 110 is connected to the live wire (output terminal 220_L) and the neutral wire (output terminal 220_N) of the AC power supply. The live wire and the neutral wire are connected to the power voltage input terminals of each power distribution module (121~12n). The input terminal 110 (J4) is used to connect to the AC power supply (external 220VAC).

[0060] In one embodiment, the 220V-IN input terminal J4 (through which 220VAC is connected) has a maximum wire diameter of 4mm², providing a large incoming line capacity. The 220VAC output terminal has a maximum wire diameter of 4mm², is unprotected, and is paralleled to the power distribution modules (121 to 12n).

[0061] If the power input circuits are limited, multiple junction boxes (power distribution modules) can be connected in series through the 220V-OUT terminal to avoid terminal paralleling and reduce wiring errors. If the external power (i.e., 220V AC power) input circuits are insufficient, the output of the first junction box's 220V-OUT terminal is connected to the 220V-IN terminal of the next junction box, which then supplies power to the next junction box, and so on. The previous junction box can power the next one, but the primary power supply is AC power.

[0062] In one embodiment, the branch voltage output terminals and the branch voltage input terminals of every two power branch modules (121-12n) are connected to the same group of output wiring terminals (141-14n), and the power voltage input terminals of every two power branch modules (121-12n) are connected to the same group of output wiring terminals (141-14n).

[0063] The power distribution modules (121~12n) are connected in series, the alarm output end of the first power distribution module (121~12n) is connected to the first end of the fault alarm module 130, and the alarm output end of the last power distribution module (121~12n) is connected to the second end of the fault alarm module 130. The power distribution modules (121~12n) are used to distribute the AC power.

[0064] Among them, the first power distribution module (121~12n) is the first power distribution module (121~12n) connected to the live wire and the neutral wire at the power voltage input end, and the last power distribution module (121~12n) is the last power distribution module (121~12n) connected to the live wire and the neutral wire at the power voltage input end.

[0065] In some embodiments, the fault alarm module 130 is used to collect the output voltage of each power distribution module (121~12n), output a fault signal when the output voltage of a power distribution module (121~12n) is zero, trigger a single fault alarm, or when the output voltage of multiple power distribution modules (121~12n) is zero, integrate multiple faults into one fault, output a fault signal, and trigger a comprehensive fault alarm.

[0066] In one embodiment, multiple faults can be integrated into a single alarm output. When any field loop power output fails, a fault alarm signal is generated and transmitted to the distributed control system (DCS input module) through hard wiring. The fault information is then displayed on the human-machine interface (computer display screen), allowing maintenance personnel to promptly go to the site to troubleshoot the fault.

[0067] In one embodiment, each group of output wiring terminals (141-14n) is also connected to an input end of an external loop device, and each group of output wiring terminals (141-14n) is used to output a power supply voltage to the external loop device.

[0068] It should be noted that each group of output terminals (141~14n) is connected to external circuit equipment, but not all of them are connected. Generally, they are fully connected to: front door fan power supply, rear door fan power supply, controller fan power supply, front door lighting, rear door lighting, and cabinet temperature and humidity controller.

[0069] The specific structure of the AC power line splitting control circuit 100 provided in the embodiment of the present application is introduced below through a specific embodiment.

[0070] See Figure 2 , Figure 2 FIG. 1 is a schematic block diagram of the specific structure of the AC power line control circuit 100 provided in an embodiment of the present application. Figure 2 As shown, the power voltage input terminal of each power distribution module (121-126) includes: a live wire input terminal (220_L) and a neutral wire input terminal (220_N), and the live wire input terminal (220_L) of each power distribution module (121-126) is provided with a shunt fuse (F1-F6) and a shunt switch (SW1-SW6).

[0071] In one embodiment, the first end of the shunt fuse (F1-F6) is connected to the live wire of the input terminal J4, and the second end of the shunt fuse (F1-F6) is connected to the first end of the shunt switch (SW1-SW6). The second end of the shunt switch (SW1-SW6) is connected to the output terminal (141-143) (J1-J3), the second end of every two shunt switches is connected to the same group of output terminals, and the third end of the shunt switch (SW1-SW6) is connected to the neutral wire of the input terminal J4. Each shunt switch (SW1-SW6) is provided with a power indicator light.

[0072] The second ends of shunt switches SW1 and SW2 are connected to the same set of output terminals J1, the second ends of shunt switches SW3 and SW4 are connected to the same set of output terminals J2, and the second ends of shunt switches SW5 and SW6 are connected to the same set of output terminals J3. To ensure easy disassembly and secure terminal connections, the two outputs are integrated into a set of four terminals.

[0073] In one embodiment, a main fuse F0 and a main switch SW1 are provided on the live wire of the input terminal J4. The live wire of the input terminal J4 is connected to the live wire input terminals (220_L) of each power distribution module (121-126), and the neutral wire of the input terminal J4 is connected to the neutral wire input terminals (220_N) of each power distribution module (121-126). A power indicator light is provided on the main switch SW1.

[0074] In one embodiment, each power output (U1~U6) is provided with an independent power switch, a power indicator light (this application uses a rocker-type switch with a built-in indicator light) and a power circuit protection (a 1A replaceable fast-blow fuse).

[0075] Please continue to see Figure 2 According to one embodiment of the present application, each power distribution module (121-126) includes: a photoelectric coupler (OR1-OR6) and at least one RC step-down unit ( Figure 2There are two of them, 1212 and 1214. RC step-down unit 1212 is connected in parallel with the optocouplers (OR1-OR6), disposed between the first and second terminals of the optocouplers (OR1-OR6), or RC step-down unit 1214 is connected in series with the second terminals of the optocouplers (OR1-OR6). Each RC step-down unit is used to reduce the power supply voltage inputted at a respective power supply voltage input terminal to the threshold voltage of the optocouplers (OR1-OR6).

[0076] In one embodiment, the photocouplers (OR1-OR6) are connected in series, with the fourth output terminal of the first photocoupler (OR1-OR6) connected to the first terminal of the fault alarm module 130, the third terminal and the fourth terminal of the adjacent photocouplers (OR1-OR6) connected, and the third terminal of the last photocoupler (OR1-OR6) connected to the second terminal of the fault alarm module 130. Each photocoupler (OR1-OR6) is used to isolate the input electrical signal and the output electrical signal of the power distribution module (121-126).

[0077] According to one embodiment of the present application, a RC voltage drop unit connected in parallel with the photoelectric couplers (OR1-OR6) includes: a resistor R1 and a capacitor C1 connected in parallel, wherein the resistor R1 and the capacitor C1 are arranged between the first and second ends of the photoelectric couplers (OR1-OR6). A RC voltage drop unit connected in series with the photoelectric couplers (OR1-OR6) includes: a resistor R9 and a capacitor C8 connected in parallel, wherein the first end of the capacitor C8 is connected to the second end of the photoelectric couplers (OR1-OR6), and the second end of the capacitor C8 is connected to the second end of the shunt switches (SW1-SW6).

[0078] It should be noted that the remaining resistors (R2 to R8) and capacitors (C2 to C7, C9 to C13) are set up in the same way and will not be repeated here.

[0079] According to one embodiment of the present application, the fault alarm module 130 includes: a voltage regulator tube D1, a short-circuit switch S1, and a fault alarm terminal J9 (131). The anode of the voltage regulator tube D1 is connected to the alarm output terminal of the first power distribution module (121-126), the cathode of the voltage regulator tube D1 is connected to the second interface of the fault alarm terminal J9, and the first interface of the fault alarm terminal J9 is connected to the alarm output terminal of the last power distribution module (121-126). The voltage regulator tube D1 is used to step down and stabilize the voltage when 48VDC is input to the fault alarm terminal J9.

[0080] In some embodiments, the short-circuit switch S1 is connected in parallel with the Zener diode D1. When 24VDC is input to the fault alarm terminal J9, the short-circuit switch S1 is closed to short-circuit the Zener diode D1. When 48VDC is input to the fault alarm terminal J9, the short-circuit switch S1 is opened to allow the Zener diode D1 to step down and stabilize the 48VDC.

[0081] According to one embodiment of the present application, the fault alarm module 130 further includes a switch 132 and a filter unit 133. The first end of the switch 132 is connected to the second end of the filter unit 133, the second end of the switch 132 is connected to the cathode of the voltage regulator D1, and the third end of the switch 132 is connected to the third end of the filter unit 133. The first end of the filter unit 133 is connected to the alarm output end of the last power distribution module (121-126). The filter unit 133 is used to filter the output voltage of each power distribution module (121-126).

[0082] According to one embodiment of the present application, the fault alarm module 130 further includes a distributed control system (DCS) 134, which is connected to the fault alarm terminal J9. When the DCS 134 detects that the output voltage of each power distribution module (121-126) reaches a preset voltage, the series-connected photoelectric couplers (OR1-OR6) are turned on, the switch 132 is turned on, the fault alarm circuit of the fault alarm module 130 is closed, and the DCS 134 outputs a normal signal.

[0083] In some embodiments, when the shunt switches (SW1-SW6) of one or more power distribution modules (121-126) are disconnected, or the shunt fuses (F1-F6) are blown, the photoelectric couplers (OR1-OR6) connected in series are disconnected, the switch tube 132 is cut off, the fault alarm circuit of the fault alarm module 130 is in a disconnected state, and the distributed control system 134 outputs a fault alarm signal, triggering a fault alarm.

[0084] Among them, the fault alarm terminal J9 outputs the 2-circuit power failure of any group of power distribution modules (2 in a group), and the normally open alarm.

[0085] In one embodiment, a single power input is distributed into multiple power distribution channels, each of which integrates switch control, power display, circuit protection, fault alarm, and terminal output, and the fault alarm signal is output to the distributed control system 134 .

[0086] According to one embodiment of the present application, the switch tube 132 includes a transistor Q6 , the base of which is connected to the second end of the filter unit 133 , the collector of which is connected to the cathode of the voltage regulator tube D1 , and the emitter of which is connected to the third end of the filter unit 133 .

[0087] In one embodiment, the AC power distribution control circuit 100 includes a six-way power distribution circuit (power distribution module) and a disconnection alarm circuit (fault alarm module). The power distribution circuit divides the input AC power into six output distribution channels. The input end has a main fuse and a main switch, and each of the six distribution channels has a sub-fuse and a sub-switch. The distribution channels are then electrically connected to the output terminals and the disconnection alarm circuit. Each of the six distribution channels is connected to a set of four output terminals and the disconnection alarm circuit.

[0088] In one embodiment, a line-break alarm circuit collects the voltage of the branch channel and, through a resistor-capacitor voltage-drop circuit, reduces the input power voltage to a voltage threshold recognizable by an optocoupler. Six optocouplers are connected in series, and the alarm circuit at the optocoupler output requires an external DC voltage input. Adding a transistor and a voltage regulator to the optocoupler output makes the alarm circuit compatible with both 24VDC and 48VDC external voltage inputs.

[0089] When all 6 branch channels detect normal (220V) voltage output, the 6-way optocoupler in series will be turned on, the transistor will be turned on, the alarm circuit will be normally closed, and a 1 signal (normal signal) will be output; when one or more branch channels are disconnected or the fuse is blown, the 6-way optocoupler in series will be disconnected, the transistor will be cut off, the alarm circuit will be normally open, and a 0 signal (fault alarm signal) will be output.

[0090] It should be noted that the fault alarm terminal is compatible with both external 24VDC and 48VDC. When the external DCS switch detection card channel is 48VDC, S1 is disconnected, allowing the 48VDC voltage to be stepped down and stabilized by voltage regulator D1 before passing through optocouplers (photocouplers OR1 to OR6) and other components. This provides a certain degree of protection and extends the service life of the optocouplers. The DCS switch detection card's query voltage is either 24VDC or 48VDC.

[0091] When connected to an external 24VDC, S1 closes, short-circuiting the Zener diode D1. If the 24VDC is then stepped down by the Zener diode, the final output voltage will be too low, potentially preventing the switch detection card from recognizing the fault alarm signal. In summary, switch S1 is used to make the fault alarm terminal compatible with both 24VDC and 48VDC switch detection cards.

[0092] It should be noted that after the volume of the AC power branch controller (including the AC power branch control circuit 100) is increased, it can be divided into more power branch circuits, preferably 6. Fewer branches are not universal, and some of the 6 branches may not be used.

[0093] According to one embodiment of the present application, the filtering unit 133 includes: a resistor (49) and a capacitor (C7); a first end of the resistor (49) and a first end of the capacitor (C7) are connected to the alarm output end of the last power distribution module (121-126), a second end of the resistor (49) is connected to the first end of the switch tube 132, and a second end of the capacitor (C7) is connected to the third end of the switch tube 132.

[0094] According to one embodiment of the present application, the fault alarm module 130 further includes a current limiting unit 135. A first end of the current limiting unit 135 is connected to the first interface of the fault alarm terminal J9, and a second end of the current limiting unit 135 is connected to the alarm output end of the last power distribution module (121-126). The current limiting unit 135 is used to limit the current input to the fault alarm terminal J9.

[0095] According to one embodiment of the present application, the current limiting unit 135 includes at least one current limiting resistor ( Figure 2 (R7 is one resistor in the current limiting unit 135). When current limiting unit 135 includes multiple current limiting resistors, the multiple current limiting resistors are connected in series. It should be noted that fault alarm terminal J9 is connected to the DCS switch detection card. The card channel has its own current limiting resistor. The additional R7 is connected to prevent on-site miswiring and direct connection to the 24V power supply, which would result in excessive current.

[0096] It should be noted that Figure 2 MARK1~3 represent the positioning pads required for machine welding.

[0097] See Figure 3 , Figure 3 FIG is a schematic block diagram of a fault alarm system 200 provided in an embodiment of the present application. Figure 3 As shown, the system 200 includes: an AC power supply 210, a display screen 220, a fault alarm device 230, an external loop device 240, and an AC power distribution line control circuit 100. The control circuit 100 includes a distributed control system 134.

[0098] In one embodiment, the AC power supply 210 is connected to the input terminal J4 of the split-line control circuit, the distributed control system 134 is connected to the display screen 220, and the external loop device 240 is connected to each group of output terminals (141-14n) of the split-line control circuit.

[0099] In one embodiment, the distributed control system 134 is configured to output a normal signal when detecting that the output voltage of each power distribution module (121-126) reaches a preset voltage, or output a fault alarm signal to trigger a fault alarm when the branch switches (SW1-SW6) of one or more power distribution modules (121-126) are disconnected or the branch fuses (F1-F6) are blown.

[0100] In one embodiment, the display screen 220 is used to display a normal signal or a fault alarm signal. The fault alarm device 230 is used to receive the fault alarm signal and perform a fault alarm based on the fault alarm signal.

[0101] An embodiment of the present application provides an AC power distribution control circuit 100, in which an input terminal J4 is connected to an AC power source, each power distribution module (121~12n) distributes the AC power source, and a fault alarm module 130 collects the output voltage of each power distribution module (121~12n). When the output voltage of a certain power distribution module (121~12n) is zero, a fault signal is output to trigger a single fault alarm, or when the output voltage of multiple power distribution modules (121~12n) is zero, multiple faults are integrated into one fault, a fault signal is output, and a comprehensive fault alarm is triggered. Each group of output terminals (141~14n) outputs the power supply voltage to an external loop device 240.

[0102] The application solution can trigger a single fault alarm or a comprehensive fault alarm when a power circuit fails, and has strong ease of use and practicality.

[0103] This application solution integrates switch control, visual display, circuit protection, and integrated alarm to solve the problems of inconvenient wiring and debugging and low reliability using traditional methods. It also solves the problems of high procurement costs for integrating multiple equipment, heavy workload for electrical assembly lines, and low production efficiency, and improves the overall aesthetics.

[0104] This solution offers the following advantages: standard dimensions for easy installation. It is scalable, allowing for serial expansion of wiring for multiple units. It boasts a high level of commercialization and an attractive appearance, facilitating widespread application. Clearly defined terminal blocks facilitate learning and mastering by third parties, improving on-site wiring accuracy. Simplified wiring reduces on-site wiring and commissioning costs, improving productivity. Multiple outputs, including integrated single-channel alarm outputs in the event of a fault, simplify wiring circuits, facilitating routine operations and equipment maintenance by maintenance personnel.

[0105] This application proposal develops a more integrated, standardized device, ensuring on-site installation requirements, aesthetics, scalability, and ease of on-site wiring and commissioning. Its compact size makes it easy to install and debug. The layout is optimized and functionality is comprehensive: each power circuit is designed with an independent switch, power display, and protection device. A fault in any power output can be reported to the monitoring system (DCS control system, computer monitoring system, or human-machine interface) with an alarm output normally open point, displaying the fault information on the human-machine interface.

[0106] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0107] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0108] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. An AC power line control circuit, characterized in that: The circuit includes: input wiring terminals, multiple power distribution modules, fault alarm modules and multiple groups of output wiring terminals; The input wiring terminal is connected to the live wire and the neutral wire of the AC power supply, and the live wire and the neutral wire are connected to the power voltage input end of each power distribution module. The input wiring terminal is used to access the AC power supply; The branch voltage output end and the branch voltage input end of every two power branch modules are connected to the same group of output wiring terminals, and the power voltage input end of every two power branch modules is connected to the same group of output wiring terminals. The power branch modules are connected in series, the alarm output end of the first power branch module is connected to the first end of the fault alarm module, and the alarm output end of the last power branch module is connected to the second end of the fault alarm module. Each power branch module is used to branch the AC power supply; the first power branch module is the first power branch module connected to the live wire and the neutral wire at the power voltage input end, and the last power branch module is the last power branch module connected to the live wire and the neutral wire at the power voltage input end; The fault alarm module is used to collect the output voltage of each power distribution module, output a fault signal when the output voltage of a power distribution module is zero, and trigger a single fault alarm, or when the output voltage of multiple power distribution modules is zero, integrate multiple faults into one fault, output a fault signal, and trigger a comprehensive fault alarm; Each group of output wiring terminals is also connected to the input end of the external loop device, and each group of output wiring terminals is used to output the power supply voltage to the external loop device.

2. The AC power line splitting control circuit according to claim 1, characterized in that: The power voltage input terminal of each power distribution module includes: a live wire input terminal and a neutral wire input terminal, and the live wire input terminal of each power distribution module is provided with a shunt fuse and a shunt switch; The first end of the shunt fuse is connected to the live wire of the input terminal, and the second end of the shunt fuse is connected to the first end of the shunt switch; the second end of the shunt switch is connected to the output terminal, and the second ends of every two shunt switches are connected to the same group of output terminals, and the third end of the shunt switch is connected to the neutral wire of the input terminal; each shunt switch is provided with a power indicator light; A main fuse and a main switch are provided on the live wire of the input terminal. The live wire of the input terminal is connected to the live wire input end of each power distribution module, and the neutral wire of the input terminal is connected to the neutral wire input end of each power distribution module. A power indicator light is provided on the main switch.

3. The AC power line splitting control circuit according to claim 2, characterized in that: Each power distribution module includes: a photoelectric coupler and at least one resistance-capacitance step-down unit; The RC step-down unit is connected in parallel with the photoelectric coupler and is arranged between the first terminal and the second terminal of the photoelectric coupler, or the RC step-down unit is connected in series with the second terminal of the photoelectric coupler, and each RC step-down unit is used to reduce the power supply voltage inputted from each power supply voltage input terminal to the threshold voltage of the photoelectric coupler; The photoelectric couplers are connected in series, the fourth output end of the first photoelectric coupler is connected to the first end of the fault alarm module, the third end of the adjacent photoelectric coupler is connected to the fourth end, and the third end of the last photoelectric coupler is connected to the second end of the fault alarm module. Each photoelectric coupler is used to isolate the input electrical signal and the output electrical signal of the power distribution module.

4. The AC power line splitting control circuit according to claim 3, characterized in that: The RC voltage drop unit connected in parallel with the photoelectric coupler includes: a resistor and a capacitor connected in parallel, wherein the resistor and the capacitor are arranged between the first terminal and the second terminal of the photoelectric coupler; The RC step-down unit connected in series with the photoelectric coupler includes a resistor and a capacitor connected in parallel, wherein the first end of the capacitor is connected to the second end of the photoelectric coupler, and the second end of the capacitor is connected to the second end of the shunt switch.

5. The AC power line splitting control circuit according to claim 3, characterized in that: The fault alarm module includes: a voltage regulator tube, a short-circuit switch and a fault alarm terminal; The anode of the voltage regulator tube is connected to the alarm output terminal of the first power distribution module, the cathode of the voltage regulator tube is connected to the second interface of the fault alarm terminal, and the first interface of the fault alarm terminal is connected to the alarm output terminal of the last power distribution module. The voltage regulator tube is used to step down and stabilize the voltage when the fault alarm terminal inputs 48VDC; The short-circuit switch is connected in parallel with the voltage regulator tube. When 24VDC is input to the fault alarm terminal, the short-circuit switch is closed to short-circuit the voltage regulator tube. When 48VDC is input to the fault alarm terminal, the short-circuit switch is opened to enable the voltage regulator tube to step down and stabilize the 48VDC.

6. The AC power line splitting control circuit according to claim 5, characterized in that: The fault alarm module further includes: a switch tube and a filter unit; The first end of the switch tube is connected to the second end of the filter unit, the second end of the switch tube is connected to the cathode of the voltage regulator tube, and the third end of the switch tube is connected to the third end of the filter unit; The first end of the filtering unit is connected to the alarm output end of the last power distribution module, and the filtering unit is used to filter the output voltage of each power distribution module.

7. The AC power line splitting control circuit according to claim 6, characterized in that: The fault alarm module further includes a distributed control system, which is connected to the fault alarm terminal; When the distributed control system detects that the output voltage of each power distribution module reaches a preset voltage, each photoelectric coupler connected in series is turned on, the switch tube is turned on, the fault alarm circuit of the fault alarm module is in a closed state, and the distributed control system outputs a normal signal; When the branch switch of one or more power distribution modules is disconnected or the branch fuse is blown, the photoelectric couplers in series are disconnected, the switch tube is cut off, the fault alarm circuit of the fault alarm module is in a disconnected state, and the distributed control system outputs a fault alarm signal to trigger a fault alarm.

8. The AC power line splitting control circuit according to claim 6, characterized in that: The switching tube includes a triode; the base of the triode is connected to the second end of the filter unit, the collector of the triode is connected to the cathode of the voltage regulator tube, and the emitter of the triode is connected to the third end of the filter unit.

9. The AC power line splitting control circuit according to claim 6, characterized in that: The filtering unit includes: a resistor (49) and a capacitor (C7); The first end of the resistor (49) and the first end of the capacitor (C7) are connected to the alarm output end of the last power distribution module, the second end of the resistor (49) is connected to the first end of the switch tube, and the second end of the capacitor (C7) is connected to the third end of the switch tube.

10. The AC power line splitting control circuit according to claim 5, characterized in that: The fault alarm module also includes a current limiting unit; The first end of the current limiting unit is connected to the first interface of the fault alarm terminal, and the second end of the current limiting unit is connected to the alarm output end of the last power distribution module. The current limiting unit is used to limit the current input to the fault alarm terminal.

11. The AC power line splitting control circuit according to claim 10, characterized in that: The current limiting unit includes at least one current limiting resistor. When the current limiting unit includes multiple current limiting resistors, the multiple current limiting resistors are connected in series.

12. A fault alarm system, characterized in that: The system comprises: an AC power supply, a display screen, a fault alarm device, an external loop device, and an AC power distribution line control circuit according to any one of claims 1 to 11, wherein the control circuit comprises a distributed control system; The AC power supply is connected to the input terminal of the branch control circuit, the distributed control system is connected to the display screen, and the external loop equipment is connected to each group of output terminal of the branch control circuit; The distributed control system is used to output a normal signal when it detects that the output voltage of each power distribution module reaches a preset voltage, or output a fault alarm signal to trigger a fault alarm when the branch switch of one or more power distribution modules is disconnected or the branch fuse is burned out; The display screen is used to display a normal signal or the fault alarm signal; The fault alarm device is used to receive the fault alarm signal and perform a fault alarm based on the fault alarm signal.

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