A frequency converter control system power hub

Abstract

The application provides a power supply hub of a frequency converter control system, which comprises a control system connecting end, a linkage system connecting end, an AC 220V working power supply connecting end, a transformer connecting end, a switching power supply connecting end and a fan control system connecting end; the power supply hub is connected with a control system, a linkage system, an AC 220V working power supply, a transformer, a switching power supply and a fan control system through the control system connecting end, the linkage system connecting end, the AC 220V working power supply connecting end, the transformer connecting end, the switching power supply connecting end and the fan control system connecting end respectively; the power supply hub of the frequency converter control system greatly simplifies the circuit in the control cabinet, reduces the difficulty of construction and maintenance, is simple in construction, easy to ensure the quality of wiring, not prone to wiring errors, and has good expansion capacity.

Description

Technical Field

[0001] This invention belongs to the field of power distribution technology of control systems, and in particular relates to a power supply hub for a frequency converter control system. Background Technology

[0002] In central air conditioning inverter control systems, controllers, inverters, and other related equipment typically employ low-voltage control systems, with common operating power supplies being AC 24V and control power supplies being DC 24V. Since my country's power supply voltage is generally AC 220V, a transformer is needed to provide AC 24V power, and a switching power supply is needed to provide DC 24V power. In existing technology, the operating and control power supplies of controllers, inverters, and related equipment are generally directly connected to the power module via wires, sometimes requiring additional components to reach the power module. This results in complex wiring between controllers, inverters, transformers, switching power supplies, and other related components. Especially when the control cabinet contains multiple inverters, overly complex wiring can easily lead to disorganized wiring within the control cabinet and wiring errors, causing difficulties in construction and maintenance. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a power supply hub for a frequency converter control system.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0005] A power supply hub for a frequency converter control system includes a control system connection terminal, a linkage system connection terminal, an AC 220V working power supply connection terminal, a transformer connection terminal, a switching power supply connection terminal, and a fan control system connection terminal, all mounted on a circuit board. The power supply hub is connected to the control system, the linkage system, the AC 220V working power supply, the transformer, the switching power supply, and the fan control system, respectively, through these terminals.

[0006] The control system connection terminal includes interface C. K1 C K2 C K3 C K4 C K5 C K6 C K7 C K8 The linkage system connection terminal includes interface C. L1 C L2 C L3 C L4 C L5C L6 C L7 C L8 The AC 220V power supply connection terminal includes interface C. A1 C A2 C A3 The transformer connection terminal includes interface C. B1 C B2 C B3 C B4 C B5 The switching power supply connection terminal includes interface C. D1 C D2 C D3 C D4 The fan control system connection terminal includes interface C. F1 C F2 C F3 ;

[0007] The interface C A1 One side is connected to the AC 220V power supply live wire, and the other side is connected via node C. G1 It is divided into three paths: the first path is connected to one side of the varistor VDR1, and the other side of VDR1 is connected to node C. G2 And then through interface C A2 Connect the neutral wire of the AC 220V power supply; the second connection is to one side of the varistor VDR2, and the other side of VDR2 is connected via interface C. A3 Connect the AC 220V power supply ground wire; third connection node C G3 And at node C G3 The path splits into two paths again: the first path goes through interface C. D2 Connect the primary side AC 220V live wire of the switching power supply, and connect the second circuit to node C first. G5 Then, respectively through interface C F2 Connect the AC220V live wire to the fan control system via interface C. B2 Connect the AC 220V live wire on the primary side of the transformer;

[0008] The interface C A2 One side is connected to the AC 220V working power supply neutral wire, and the other side is connected through node C. G2 It is divided into two paths: the first path is connected to one side of the varistor VDR1, and the second path is connected to node C. G4 And at node C G4 The path splits into two paths again: the first path goes through interface C. D1 Connect the primary side AC 220V neutral terminal of the switching power supply. For the second circuit, first connect to node C. G6 Then, respectively through interface C F1Connect the fan control system to the AC 220V neutral wire via interface C. B1 Connect the AC 220V neutral wire on the primary side of the transformer.

[0009] The interface C B3 One side is connected to the primary side of the transformer with self-induced AC 380V, and the other side is first connected to relay J. FS Normally open contact J FS-1 And then through interface C F3 The fan control system terminal is self-sensing AC 380V;

[0010] The interface C D3 One side is connected to the negative terminal of the DC 24V secondary side of the switching power supply, and the other side is connected through node C. G12 It is divided into two paths: the first path is through interface C. L7 Connect the linkage system to the DC 24V negative terminal, and the second channel is connected via interface C. K5 Connect to the DC24V negative terminal of the control system.

[0011] The interface C D4 One side is connected to the positive terminal of the DC 24V secondary side of the switching power supply, and the other side is connected through node C. G11 It is divided into two paths: the first path is through interface C. L8 Connect the linkage system to the DC 24V positive terminal, and the second channel is connected via interface C. K6 Connect to the DC24V positive terminal of the control system;

[0012] The interface C B4 One side is connected to the AC 24V neutral wire on the secondary side of the transformer, and the other side is connected through node C. G7 It is divided into two paths: the first path is connected to the varistor VDR3; the second path is at node C. G9 The path splits into two routes again: the first route passes through node C. G13 Connection interface C D3 Then through interface C L5 Connect the AC 24V neutral wire to the linkage system terminal, and the second path is through interface C. K7 Connect the AC 24V neutral wire to the control system terminal;

[0013] The interface C B5 One side is connected to the AC 24V live wire on the secondary side of the transformer, and the other side is connected in series with fuse FU1, then through node C. G8 It is divided into two paths: the first path is connected to the other side of the varistor VDR3; the second path is at node C. G10 The path splits into two paths again: the first path goes through interface C. L6 Connect the AC 24V live wire to the linkage system terminal, and the second path is through interface C. K8 Connect the AC 24V live wire to the control system terminal;

[0014] The interface C K1 One side connects to the first linkage control signal of the control system, and the other side connects to interface C. L1 Connect the first linkage control signal to the linkage system end;

[0015] The interface C K2 One side connects to the second linkage control signal of the control system, and the other side connects to interface C. L2 Connect the second linkage control signal to the linkage system end;

[0016] The interface C K3 One side connects to the first inverter's operating signal at the control system terminal, and the other side connects to fuse FU2 in series at node C. G16 The process is divided into two paths: the first path is through interface C. L4 The first inverter's operating signal is connected to the linkage system terminal. The second signal is connected to the positive terminal of diode VD1, and the negative terminal of VD1 is connected to node C. G15 Interface C K4 One side connects to the second inverter's operating signal at the control system terminal, and the other side connects to fuse FU3 in series at node C. G17 The process is divided into two paths: the first path is through interface C. L3 The second inverter's operating signal is connected to the linkage system terminal, and the second channel is connected to diode V. D2 Positive electrode, V D2 The negative terminal is also connected to node C. G15 Node C G15 The other side is divided into two paths: the first path is connected in series with relay J. FS After connecting the coil and fuse FU4, connect to node C. G14 The second path connects to the negative terminal of diode VD3, and the positive terminal of VD3 is also connected to node C. G14 Node C G14 The other side connects to interface C D3 .

[0017] Furthermore, the control system includes a DDC controller, a frequency converter, and control circuitry between the two.

[0018] Furthermore, the first inverter operating signal and the second inverter operating signal at the control system end are respectively connected to the DC 24V positive terminal of the control system end via switches.

[0019] Furthermore, the fan control system includes a fan and a temperature control switch.

[0020] Compared with existing technologies, the power supply hub of the frequency converter control system described in this invention has the following advantages:

[0021] 1. The power supply hub of the frequency converter control system provided by this invention distributes standard AC 220V operating power to the transformer and switching power supply on the one hand, and distributes AC 24V power provided by the transformer and DC 24V power provided by the switching power supply to multiple electrical devices such as the control system and linkage system on the other hand. The transformer, switching power supply, control system, and linkage system do not need to be directly connected to each other; they only need to be connected to the power supply hub, thereby greatly simplifying the wiring within the control cabinet and reducing the difficulty of construction and maintenance.

[0022] 2. The power supply hub of the frequency converter control system provided by this invention also serves as a communication bridge between the control system and the linkage system, further eliminating the direct wiring between the control system and the linkage system and simplifying the wiring in the control cabinet.

[0023] 3. The power supply hub of the inverter control system provided by this invention simultaneously provides two operating voltages, AC 220V and AC 160V, to the cooling fan inside the control cabinet. If the temperature inside the control cabinet is higher than the set value, the fan will be driven by AC 220V at high speed for rapid cooling, regardless of whether the inverter is running. If the temperature inside the cabinet is lower than the set value, the fan will only be driven by AC 160V at low speed when the inverter is running; the fan will stop when the inverter is not running. This not only reduces the power consumption of the fan but also greatly extends its service life.

[0024] 4. The power supply hub of the frequency converter control system provided by this invention can use standard pluggable terminals for its interfaces with AC 220V power supply, transformer, switching power supply, control system and linkage system. It is simple to construct, easy to ensure the wiring quality, and less prone to wiring errors.

[0025] 5. The power supply hub of the inverter control system provided by this invention can easily increase its DC 24V power interface and AC 24V power interface for the control system and linkage system, as well as the number of inverters in the control system and the number of control signals in the linkage system, and has good expansion capabilities. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 A schematic diagram illustrating the working principle of the power supply center of the inverter control system created in this invention;

[0028] Figure 2 The schematic diagram of the power supply center of the frequency converter control system created by this invention. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this 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 on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1-2 As shown, this invention provides a power supply hub for a frequency converter control system, including a control system connection terminal, a linkage system connection terminal, an AC 220V working power supply connection terminal, a transformer connection terminal, a switching power supply connection terminal, and a fan control system connection terminal; the power supply hub is connected to the control system, the linkage system, the AC 220V working power supply, the transformer, the switching power supply, and the fan control system respectively through the control system connection terminal, the linkage system connection terminal, the AC 220V working power supply connection terminal, the transformer connection terminal, the switching power supply connection terminal, and the fan control system connection terminal;

[0034] The control system includes a DDC controller, frequency converters, and control circuitry between them. The DDC controller requires an AC 24V operating voltage and a DC 24V control voltage, outputting the frequency converter's operating signal and the control signals required by the linkage system. In the embodiment of this invention, the control system includes two frequency converters.

[0035] The linkage system refers to external devices related to the control system, such as fault alarm lights, inverter operation indicator lights, various valve groups, and sensors, the specifics of which can be determined according to usage requirements. This invention provides the linkage system with AC 24V operating voltage, DC 24V control voltage, inverter operation signals, and linkage control signals directly issued by the control system, fully meeting the usage requirements of various types of equipment.

[0036] AC 220V working power supply, i.e., ordinary municipal power supply;

[0037] Switching power supplies are used to provide DC 24V power, but their operating power is AC 220V.

[0038] The transformer is used to provide AC 24V power, but its operating power is AC 220V.

[0039] The fan control system includes a control cabinet cooling fan and a temperature control switch. It adjusts the fan start / stop and speed according to the temperature inside the cabinet and the operating status of the frequency converter to achieve temperature control inside the control cabinet.

[0040] The control system connection terminal includes interface C. K1 C K2 C K3 C K4 C K5 C K6 C K7 C K8 The linkage system connection terminal includes interface C. L1 C L2 C L3 C L4 C L5 C L6 C L7 C L8 The AC 220V power supply connection terminal includes interface C. A1 C A2 C A3 The transformer connection terminal includes interface C. B1 C B2 C B3 C B4 C B5 The switching power supply connection terminal includes interface C. D1 C D2 CD3 C D4 The fan control system connection terminal includes interface C. F1 C F2 C F3 ;

[0041] The interface C A1 One side is connected to the AC 220V power supply live wire, and the other side is connected via node C. G1 It is divided into three paths: the first path is connected to one side of the varistor VDR1, and the other side of VDR1 is connected to node C. G2 And then through interface C A2 Connect the neutral wire of the AC 220V power supply; the second connection is to one side of the varistor VDR2, and the other side of VDR2 is connected via interface C. A3 Connect the AC 220V power supply ground wire; third connection node C G3 And at node C G3 The path splits into two paths again: the first path goes through interface C. D2 Connect the primary side AC 220V live wire of the switching power supply, and connect the second circuit to node C first. G5 Then, respectively through interface C F2 Connect the AC220V live wire to the fan control system via interface C. B2 Connect the AC 220V live wire on the primary side of the transformer;

[0042] The interface C A2 One side is connected to the AC 220V working power supply neutral wire, and the other side is connected through node C. G2 It is divided into two paths: the first path is connected to one side of the varistor VDR1, and the second path is connected to node C. G4 And at node C G4 The path splits into two paths again: the first path goes through interface C. D1 Connect the primary side AC 220V neutral wire of the switching power supply. For the second circuit, first connect to node C. G6 Then, respectively through interface C F1 Connect the fan control system to the AC 220V neutral wire via interface C. B1 Connect the AC 220V neutral wire on the primary side of the transformer.

[0043] The interface C B3 One side is connected to the primary side of the transformer with self-induced AC 380V, and the other side is first connected to relay J. FS Normally open contact J FS-1 And then through interface C F3 The fan control system terminal is self-sensing AC 380V;

[0044] The interface C D3One side is connected to the negative terminal of the DC 24V secondary side of the switching power supply, and the other side is connected through node C. G12 It is divided into two paths: the first path is through interface C. L7 Connect the linkage system to the DC 24V negative terminal, and the second channel is connected via interface C. K5 Connect to the DC24V negative terminal of the control system.

[0045] The interface C D4 One side is connected to the positive terminal of the DC 24V secondary side of the switching power supply, and the other side is connected through node C. G11 It is divided into two paths: the first path is through interface C. L8 Connect the linkage system to the DC 24V positive terminal, and the second channel is connected via interface C. K6 Connect to the DC24V positive terminal of the control system;

[0046] The interface C B4 One side is connected to the AC 24V neutral wire on the secondary side of the transformer, and the other side is connected through node C. G7 It is divided into two paths: the first path is connected to the varistor VDR3; the second path is at node C. G9 The path splits into two routes again: the first route passes through node C. G13 Connection interface C D3 Then through interface C L5 Connect the AC 24V neutral wire to the linkage system terminal, and the second path is through interface C. K7 Connect the AC 24V neutral wire to the control system terminal;

[0047] The interface C B5 One side is connected to the AC 24V live wire on the secondary side of the transformer, and the other side is connected in series with fuse FU1, then through node C. G8 It is divided into two paths: the first path is connected to the other side of the varistor VDR3; the second path is at node C. G10 The path splits into two paths again: the first path goes through interface C. L6 Connect the AC 24V live wire to the linkage system terminal, and the second path is through interface C. K8 Connect the AC 24V live wire to the control system terminal;

[0048] The interface C K1 One side connects to the first linkage control signal of the control system, and the other side connects to interface C. L1 Connect the first linkage control signal to the linkage system end;

[0049] The interface C K2 One side connects to the second linkage control signal of the control system, and the other side connects to interface C. L2 Connect the second linkage control signal to the linkage system end;

[0050] The interface C K3One side connects to the control system's first frequency converter's operating signal, and the other side connects in series with fuse FU2 at node C. G16 The process is divided into two paths: the first path is through interface C. L4 The first inverter's operating signal is connected to the linkage system terminal. The second signal is connected to the positive terminal of diode VD1, and the negative terminal of VD1 is connected to node C. G15 Interface C K4 One side connects to the second inverter's operating signal at the control system terminal, and the other side connects to fuse FU3 in series at node C. G17 The process is divided into two paths: the first path is through interface C. L3 The second inverter's operating signal is connected to the linkage system. The second path connects to the positive terminal of diode VD2, and the negative terminal of VD2 is also connected to node C. G15 Node C G15 The other side is divided into two paths: the first path is connected in series with relay J. FS After connecting the coil and fuse FU4, connect to node C. G14 The second path connects to the negative terminal of diode VD3, and the positive terminal of VD3 is also connected to node C. G14 Node C G14 The other side connects to interface C D3 .

[0051] In use, the power supply hub is connected to the control system, linkage system, AC 220V working power supply, transformer, switching power supply, and fan control system through various interfaces. The AC 220V working power supply is controlled by air switch K1. When K1 is closed, the power supply hub is powered on, the secondary side of the switching power supply outputs DC 24V control power, and the secondary side of the transformer outputs AC 24V working power, which are sent to the corresponding interfaces of the control system and linkage system, respectively.

[0052] The DC 24V positive terminal of the control system is connected to one side of switches K3 and K4 inside the control system, and the other side of K3 is connected to interface C. K3 That is, the operating signal of the first frequency converter on the control system side, and the other side of K4 is connected to interface C. K4 This refers to the operating signal of the second frequency converter on the control system side. When the first frequency converter is running, switch K3 closes, transmitting DC 24V+ to interface C. K3 After passing through fuse FU2, the signal is transmitted to the corresponding interface of the linkage system on one hand, and to relay J via diode VD1 on the other. FS Coil; When the second frequency converter is running, switch K4 closes, transmitting DC 24V+ to interface C. K4 After passing through fuse FU3, the signal is transmitted to the corresponding interface of the linkage system on one hand, and to relay J via diode VD2 on the other. FS Coil. It can be seen that when any frequency converter is running, relay J... FSBoth are energized, and their normally open contact J is also energized. FS-1 closure.

[0053] The primary side of the transformer has AC 220V live wire and neutral wire connected to the live wire and neutral wire of an external AC 220V power supply, respectively. After the transformer is powered on, its primary side AC 380V live wire terminal generates AC 380V voltage through self-induction effect and transmits it to the corresponding interface of the fan control system.

[0054] The fan control system includes a temperature control switch K2 and a fan. The common point of the temperature control switch K2 is connected in series with the fan and then to the external AC 220V power supply live wire. The temperature control switch K2 has two contacts. When the ambient temperature is higher than a specific temperature, such as 30℃, one contact is automatically closed; when it is lower than that temperature, the other contact is closed. The contact closed at high temperatures connects to the AC 220V neutral wire of the power supply, and the contact closed at low temperatures connects to the self-induced AC 380V provided by the transformer. When the ambient temperature is higher than 30℃, both sides of the fan are connected to the AC 220V live wire and neutral wire respectively, i.e., at the standard operating voltage, and normal high-speed airflow. When the ambient temperature is lower than 30℃, there are two situations: if one or more frequency converters are running, relay J... FS Power on, normally open contact J FS-1 When closed, the fan is connected to an AC 220V live wire and a self-induced AC 380V wire on either side, creating a 160V voltage difference, causing the fan to rotate at low speed; if all inverters are not running, J FS-1 The fan is not running when the device is disconnected.

[0055] As can be seen, fan operation is primarily controlled by temperature; it will output air normally as long as the temperature exceeds the set value. Secondly, it is controlled by the inverter's operating status; it will output air as long as the inverter is running, but will only maintain low-speed operation when the temperature does not exceed the set value. When the temperature does not exceed the set value and the inverter is not running, the fan stops. This achieves efficient fan utilization, saving electricity while extending its service life.

[0056] In this invention, varistors VDR1 and VDR2 are used to prevent overvoltage of the AC 220V operating power supply. If overvoltage occurs, the varistors conduct, and the circuit breaker trips. VDR3 is used to prevent overvoltage of the AC 24V operating power supply. If overvoltage occurs, the varistor conducts, and fuse FU1 blows. Fuses FU2 and FU3 blow when the inverter's operating signal current is too high, and fuse FU4 blows when relay J... FS The varistor and fuse will blow if the coil current is too high. Both the varistor and fuse mentioned above protect the power supply center and the modules and devices connected to it.

[0057] In this invention, diodes VD1 and VD2 are used for interference prevention, avoiding mutual interference between the operating signals of the first and second frequency converters. Diode VD3 is a freewheeling diode, preventing relay J from interfering with current flow. FS After the power is cut off, the induced electromotive force on the coil damages the power supply center.

[0058] In this invention, the power supply hub, centered around a switching power supply and a transformer, is divided into a high-voltage side and a low-voltage side. The high-voltage side provides AC 220V operating power to the switching power supply, transformer, and fan. The low-voltage side transmits the AC 24V operating power from the transformer and the DC 24V control power from the switching power supply to the control system and linkage system. It also uses the aforementioned DC 24V power to output the inverter's operating status, which is then used for fan control and linkage system control. Furthermore, the low-voltage side is equipped with communication lines directly connecting the control system and linkage system. The transformer, switching power supply, control system, linkage system, and fan do not require direct wiring between themselves; they only need to be connected to the power supply hub.

[0059] The linkage system provides interfaces for DC 24V, AC 24V, inverter operating signals, and direct connection to the control system. Therefore, it can flexibly connect various devices according to project needs to achieve diverse functions. For example, when connecting a three-wire sensor, it can be powered by DC 24V and use the linkage control signal to provide feedback to the control system; when connecting a valve, it can be powered by AC 24V and use the linkage control signal to control the valve's opening and closing; when connecting an inverter operating indicator light, the inverter operating signal and DC 24V can form a power supply circuit for the indicator light, etc.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A frequency converter control system power hub, characterized by: The control system connection end, the linkage system connection end, the AC 220V working power connection end, the transformer connection end, the switching power supply connection end and the fan control system connection end are arranged on the circuit board; the power supply hub is connected with the control system, the linkage system, the AC 220V working power, the transformer, the switching power supply and the fan control system through the control system connection end, the linkage system connection end, the AC 220V working power connection end, the transformer connection end, the switching power supply connection end and the fan control system connection end. The control system connection end includes interface C K1 -C K8 The linkage system connection end includes interface C L1 -C L8 The AC 220V working power supply connection end includes interface C A1 -C A3 The transformer connection end includes interface C B1 -C B5 The switching power supply connection end includes interface C D1 -C D4 The fan control system connection end includes interface C F1- C F3 ​ Interface C A1 One side connects AC 220V working power supply live wire, the other side connects through interface C F2 Connects fan control system end AC 220V live wire through interface C B2 Connects transformer primary side AC 220V live wire through interface C D2 Connects switch power supply primary side AC 220V live wire Interface C A2 One side connects AC 220V working power zero line, the other side connects AC 220V zero line through interface C F1 Connects fan control system end AC 220V zero line, through interface C B1 Connects transformer primary side AC 220V zero line, through interface C D1 Connects switch power supply primary side AC 220V zero line end; Interface C B3 One side of the transformer primary side self-induction AC 380V, the other side first connected to the relay J FS Normally open contact J FS-1 , and then through the interface C F3 Connect the fan control system end self-induction AC 380V; Interface C D3 One side is connected with the secondary side DC 24V negative pole of the switching power supply, and the other side is connected with the DC 24V negative pole of the linkage system end and the DC 24V negative pole of the control system end. Interface C D4 One side is connected with the positive electrode of the secondary side DC 24V of the switching power supply, and the other side is connected with the positive electrode of the DC 24V of the linkage system end and the positive electrode of the DC 24V of the control system end. Interface C B4 One side is connected with the secondary side AC 24V zero line of the transformer, and the other side is connected with the AC 24V zero line of the linkage system end and the AC 24V zero line of the control system end; Interface C B5 One side connects the transformer secondary side AC 24V live wire, the other side connects the linkage system end AC 24V live wire and the control system end AC 24V live wire; Interface C K1 connects the first linkage control signal from the control system end on one side and the interface C on the other side L1 connects the first linkage control signal from the linkage system end Interface C K2 One side connects the control system end second linkage control signal, the other side through interface C L2 Connect the linkage system end second linkage control signal; Interface C K3 one side connects the first frequency converter running signal of the control system end, the other side is connected in series with the fuse FU2, and is divided into two ways at the node C G16 : the first way connects the first frequency converter running signal of the linkage system end through the interface C L4 , and the second way connects the positive electrode of the diode VD1, and the negative electrode of the diode VD1 connects the node C G15 ; the interface C K4 one side connects the second frequency converter running signal of the control system end, the other side is connected in series with the fuse FU3, and is divided into two ways at the node C G17 : the first way connects the second frequency converter running signal of the linkage system end through the interface C L3 , and the second way connects the positive electrode of the diode VD2, and the negative electrode of the diode VD2 connects the node C G15 ; the node C G15 the other side is divided into two ways: the first way connects the node C FS after being connected in series with the relay J G14 coil and the fuse FU4, and the second way connects the negative electrode of the diode VD3, and the positive electrode of the diode VD3 connects the node C G14 ; the node C G14 the other side connects the interface C D3 .

2. A power supply hub for a frequency converter control system according to claim 1, characterized in that: The control system comprises a DDC controller, a frequency converter and a control circuit between the DDC controller and the frequency converter.

3. A power supply hub for a frequency inverter control system according to claim 2, characterized in that: The control system end first frequency converter operation signal and the control system end second frequency converter operation signal are connected with the control system end DC 24V positive pole through switches.

4. A power supply hub for a frequency converter control system according to claim 1, characterized in that: The fan control system comprises a fan and a temperature control switch.

5. A power supply hub for a frequency converter control system according to claim 1, characterized in that: Interface C A1 The other side passes through node C G1 Divided into three ways: the first way connects the one side of the pressure sensitive resistor VDR1, the other side of VDR1 connects node C G2 , and then connects the zero line of AC 220V working power supply through interface C A2 ; the second way connects the one side of the pressure sensitive resistor VDR2, the other side of VDR2 connects the ground wire of AC 220V working power supply through interface C A3 ; the third way connects node C G3 , and is divided into two ways again at node C G3 : the first way connects the primary side AC 220V live wire of the switching power supply through interface C D2 , and the second way first connects node C G5 , and then respectively connects the primary side AC 220V live wire of the fan control system and the primary side AC 220V live wire of the transformer through interfaces C F2 and C B2 .

6. A power supply hub for a frequency converter control system according to claim 1, characterized in that: Interface C A2 The other side through node C G2 Divided into two ways: the first way connects the one side of the pressure sensitive resistor VDR1, and the second way connects node C G4 , and is divided into two ways again at node C G4 : the first way connects the AC 220V zero line of the primary side of the switching power supply through interface C D1 , and the second way first connects node C G6 , and then respectively connects the AC 220V zero line of the fan control system end through interface C F1 , and connects the AC 220V zero line of the transformer primary side through interface C B1 .

7. A power supply hub for a frequency converter control system according to claim 1, characterized in that: Interface C B4 The other side passes through node C G7 It is divided into two paths: the first path is connected to the varistor VDR3; the second path is at node C. G9 The path splits into two routes again: the first route passes through node C. G13 Connection interface C D3 Then through interface C L5 Connect the AC 24V neutral wire to the linkage system terminal, and the second path is through interface C. K7 Connect the AC 24V neutral wire to the control system terminal.

8. A power supply hub for a frequency converter control system according to claim 1, characterized in that: Interface C B5 After the other side of the series fuse FU1, through the node C G8 Divided into two ways: the first of which is connected to the other side of the pressure sensitive resistor VDR3; the second is divided into two ways again at the node C G10 The first of which is connected to the AC 24V firewire of the linkage system end through the interface C L6 The second of which is connected to the AC 24V firewire of the control system end through the interface C K8 The second of which is connected to the AC 24V firewire of the control system end through the interface C 9. A power supply hub for a frequency converter control system according to claim 1, characterized in that: Interface C D3 The other side through node C G12 Divided into two ways: the first way through interface C L7 Connect the DC 24V negative of the linkage system end, the second way through interface C K5 Connect the DC 24V negative of the control system end.

10. A power supply hub for a frequency converter control system according to claim 1, characterized in that: Interface C D4 The other side through node C G11 Divided into two ways: the first way through interface C L8 Connect the positive pole of the DC 24V of the linkage system end DC 24V, the second way through interface C K6 Connect the positive pole of the DC 24V of the control system end DC 24V.

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