CN218976335U - Variable frequency control system - Google Patents
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- CN218976335U CN218976335U CN202222313277.2U CN202222313277U CN218976335U CN 218976335 U CN218976335 U CN 218976335U CN 202222313277 U CN202222313277 U CN 202222313277U CN 218976335 U CN218976335 U CN 218976335U
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Abstract
The embodiment of the utility model provides a variable frequency control system, which comprises a controller, a plurality of inversion units and a plurality of bypass circuits, wherein: the controller is connected with each inversion unit through optical fibers; the inverter units are in one-to-one correspondence with the bypass circuits, each inverter unit is connected with the corresponding bypass circuit through optical fibers or in a wireless mode, and the voltage levels of each inverter unit and the corresponding bypass circuit are the same; the controller is used for: sending a bypass signal to a first bypass circuit corresponding to a first inversion unit, so that the first bypass circuit bypasses the first inversion unit; the first inversion unit is an inversion unit with faults. The utility model can save the space required by wiring.
Description
Technical Field
The utility model relates to the technical field of frequency converters, in particular to a frequency conversion control system.
Background
Currently, in the application of high-voltage frequency converters, a control system communicates with an inverter unit through an optical fiber. If one or more inverter units are in fault, the control system bypasses the faulty inverter unit through the bypass system under the condition that the high-voltage frequency converter has a redundant inverter function, so that continuous operation without shutdown is realized.
However, the bypass system is remote from the inverter unit, and therefore requires a large number of twisted pair wires to be connected. And because the voltage levels of the two are different, and the electric gap of the circuit needs to be kept to meet the requirement, enough space needs to be left in the cabinet body for bypassing the control line.
Disclosure of Invention
The embodiment of the utility model provides a variable frequency control system which can save space required by wiring.
An embodiment of the present utility model provides a variable frequency control system, including a controller, a plurality of inverter units, and a plurality of bypass circuits, wherein:
the controller is connected with each inversion unit through optical fibers;
the inverter units are in one-to-one correspondence with the bypass circuits, each inverter unit is connected with the corresponding bypass circuit through optical fibers or in a wireless mode, and the voltage levels of each inverter unit and the corresponding bypass circuit are the same; the controller is used for: sending a bypass signal to a first bypass circuit corresponding to a first inversion unit, so that the first bypass circuit bypasses the first inversion unit; the first inversion unit is an inversion unit with faults.
In one embodiment, the power input of each inverter unit is connected to the power input of the corresponding bypass circuit such that the voltage levels of each inverter unit and the corresponding bypass circuit are the same.
In one embodiment, the bypass circuits corresponding to the adjacent inverter units are connected through optical fibers or connected in a wireless mode.
In one embodiment, the controller is further configured to: and after detecting that the bypass processing of the first bypass circuit fails, sending a bypass signal to the first bypass circuit through a second bypass circuit corresponding to a second inversion unit adjacent to the first inversion unit so as to bypass the first inversion unit.
In one embodiment, the variable frequency control system further comprises a voltage transformer;
the plurality of inverter units form three corresponding three-phase serial circuits, each serial circuit comprises at least two inverter units connected in series, the input ends of the three serial circuits are connected together, and the output ends of the three serial circuits are connected with the voltage transformer; each serial circuit is used for executing the conversion process of alternating current-direct current-alternating current, and the voltage transformer is used for converting the first alternating voltage output by each serial circuit into second alternating voltage and sending the second alternating voltage to the controller so that the controller obtains each corresponding output voltage condition; the second alternating voltage is less than the first alternating voltage.
In one embodiment, the variable frequency control system further comprises a current transformer;
the plurality of inverter units form three corresponding three-phase serial circuits, each serial circuit comprises at least two inverter units connected in series, the input ends of the three serial circuits are connected together, and the output ends of the three serial circuits are respectively connected with the current transformer; each serial circuit is used for executing the conversion process of alternating current-direct current-alternating current, and the current transformer is used for converting the first alternating current output by each serial circuit into second alternating current and sending the second alternating current to the controller so that the controller obtains each corresponding output current condition; the second alternating current is less than the first alternating current.
In one embodiment, the controller has a first wireless transmission module built in; the system further comprises an intelligent circuit breaker connected with the controller, wherein a second wireless transmission module is arranged in the intelligent circuit breaker, and the intelligent circuit breaker is used for being connected with first external equipment; the controller is used for sending a control signal to the first external device through the first wireless transmission module and the second wireless transmission module.
In one embodiment, the variable frequency control system further comprises: the contactor is internally provided with a third wireless transmission module, and is respectively connected with the intelligent circuit breaker and second external equipment; correspondingly, the controller is used for sending control signals to the contactor through the first wireless transmission module, the second wireless transmission module and the third wireless transmission module so that the controller can control the second external equipment to be turned on or turned off.
In one embodiment, the controller has a first wireless transmission module built in; the system further comprises: an intelligent panel; a fifth wireless transmission module is arranged in the intelligent panel; the intelligent panel is connected with the controller, and the controller is used for sending data returned by each external device to the intelligent panel for display through the fifth wireless transmission module.
In one embodiment, the controller is further configured to: and stopping operation when the number of the non-faulty inverter units is less than a preset value.
The variable frequency control system provided by the embodiment of the utility model has the following technical effects after being respectively or combined:
(1) Each inversion unit corresponds to a bypass circuit, and the bypass circuit can enable the failed inversion unit to be bypassed, so that the failed inversion unit does not participate in the processing process of the circuit, the whole circuit is not affected, and the non-stop operation is realized.
(2) The wireless mode can greatly reduce the number of wires, further save the wiring space, save the manpower cost of wiring and school line. Compared with the prior art adopting a twisted pair connection mode, the optical fiber connection mode can enable signal transmission to be more efficient and faster, and has stronger anti-interference capability.
(3) Since the voltage levels of each inverter unit and the corresponding bypass circuit are the same, the electrical clearance requirement of the circuit is not required to be maintained, namely, a certain clearance is not required to be maintained between the circuits, and a lot of space can be saved when wiring is performed. In the embodiment of the utility model, the optical fiber mode is an optical signal transmission mode, so that the risk of interference does not exist, and the bypass circuit does not generate an error control signal to the inverter unit, namely the problem of electric insulation is solved. Therefore, the embodiment of the utility model can solve the problem of electrical insulation while reducing the wiring gap, and avoid the problem of signal interference.
(4) The bypass circuits corresponding to the adjacent inversion units are connected, so that the whole variable frequency control system is provided with a plurality of control loops, and the probability that the failed inversion unit is successfully bypassed is greatly increased.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained based on these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a variable frequency control system according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a variable frequency control system according to an embodiment of the present utility model.
Reference numerals:
| 10 | controller for controlling a |
| 20 | |
| 30 | |
| 40 | Voltage transformer |
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present utility model are within the scope of protection of the present utility model.
One embodiment of the utility model provides a variable frequency control system.
Referring to fig. 1, a variable frequency control system provided in an embodiment of the present utility model includes a controller 10, a plurality of inverter units 20, and a plurality of bypass circuits 30, wherein:
the controller 10 is connected to each of the inverter units 20 through an optical fiber;
the inverter units 20 and the bypass circuits 30 are in one-to-one correspondence, each inverter unit 20 and the corresponding bypass circuit 30 are connected through optical fibers or in a wireless manner, and the voltage levels of each inverter unit 20 and the corresponding bypass circuit 30 are the same; the controller 10 is configured to: sending a bypass signal to a first bypass circuit corresponding to a first inversion unit, so that the first bypass circuit bypasses the first inversion unit; the first inversion unit is an inversion unit with faults.
For example, there are 12 total inverter units, the first to fourth inverter units are connected in series, the fifth to eighth inverter units are also connected in series, the ninth to twelfth inverter units are connected in series, and the three series lines are connected in parallel to form an inverter unit circuit. Each inverter unit is connected with the controller, so that each inverter unit can receive a control signal output by the controller.
The inverter unit is used for converting direct current into alternating current or converting alternating current into direct current, and particularly can be used for converting direct current into alternating current or converting alternating current into direct current according to requirements.
Each inverter unit corresponds to a bypass circuit, and the bypass circuit has the function of enabling the failed inverter unit to be bypassed, so that the failed inverter unit does not participate in the processing process of the circuit and cannot influence the whole circuit.
The voltage levels of each inverter unit and the corresponding bypass circuit are the same, so that the requirement of maintaining the electric gap of the circuit is not required, namely, certain gaps are not required to be kept between the circuits, and a lot of space can be saved when wiring is carried out, namely, a lot of space can be saved when wiring is carried out in the cabinet body. Wherein the electrical gap refers to the shortest spatial distance measured between two conductive parts or between a conductive part and a device protection interface. Namely, the shortest distance of insulation can be realized through air under the condition of ensuring stable and safe electrical performance.
Each inversion unit is connected with the corresponding bypass circuit through optical fibers or in a wireless mode, and is connected in a wireless mode or in an optical fiber mode. The wireless mode can greatly reduce the number of wires, further save the wiring space, save the manpower cost of wiring and school line. Compared with the prior art adopting a twisted pair connection mode, the optical fiber connection mode can enable signal transmission to be more efficient and faster, and has stronger anti-interference capability.
Moreover, in the prior art, if the wiring gap is small, there is a risk of being disturbed by adopting a mode of connecting the control cords such as twisted pair wires, so that the bypass circuit may generate an erroneous control signal to the inverter unit. In the embodiment of the utility model, the optical fiber is an optical signal transmission mode, so that the risk of interference does not exist, and the bypass circuit does not generate an error control signal to the inverter unit, namely, the problem of electric insulation is solved. Therefore, the embodiment of the utility model can solve the problem of electrical insulation while reducing the wiring gap, and avoid the problem of signal interference.
Wherein, the effect of controller is: and sending a bypass signal to a first bypass circuit corresponding to the first inversion unit with the fault, and bypassing the first inversion unit after the first bypass circuit receives the bypass signal. Specifically, the controller sends a bypass signal to the first bypass circuit through the first inverter unit. It is understood that the function of the inverter unit for data forwarding in the event of a fault may also be present, so that the controller sends a bypass signal to the first bypass circuit via the first inverter unit.
In one embodiment, the power input of each inverter unit is connected to the power input of the corresponding bypass circuit such that the voltage levels of each inverter unit and the corresponding bypass circuit are the same.
That is, the power input terminal of the inverter unit and the power input terminal of the corresponding bypass circuit are connected such that the voltage levels input into the inverter unit and the bypass circuit are the same.
In the prior art, because the power supply levels of the two are different, in order to avoid signal interference, the distance between the inverter unit and the bypass circuit needs to be relatively long. In the embodiment of the utility model, the voltage levels of the inversion unit and the bypass circuit are the same, so that the distance between the inversion unit and the bypass circuit can be set to be smaller, and the inversion unit and the bypass circuit are arranged together to form an independent component.
In one embodiment, the bypass circuits corresponding to the adjacent inverter units are connected through optical fibers or connected in a wireless mode. Thus, information interaction can be performed between bypass circuits corresponding to adjacent inversion units.
Further, the controller may be further configured to: and after detecting that the bypass processing of the first bypass circuit fails, sending a bypass signal to the first bypass circuit through a second bypass circuit corresponding to a second inversion unit adjacent to the first inversion unit so as to bypass the first inversion unit.
That is, if the first inverter unit that fails to perform the data forwarding function, the first bypass circuit cannot receive the bypass signal, and thus the first inverter unit cannot be bypassed, and the bypass processing fails. For example, the controller does not receive the feedback signal of the bypass execution result within a certain time after sending the bypass signal, at this time, the controller sends the bypass signal to the second bypass circuit corresponding to the second inverter unit adjacent to the first inverter unit, and the second bypass circuit sends the bypass signal to the first bypass signal after receiving the bypass signal, so that the first bypass signal bypasses the first inverter unit. Specifically, the controller sends a bypass signal for the first inverter unit to the second bypass circuit through the second inverter unit, the second bypass circuit sends the bypass signal to the first bypass circuit, and the first bypass circuit bypasses the first inverter unit.
Further, if the bypass processing still fails in this way, the controller may send a bypass signal to a third bypass circuit corresponding to a third inverter unit adjacent to the second inverter unit, and the third bypass circuit may send the bypass signal to the first bypass circuit through the second bypass circuit, so that the first bypass circuit bypasses the first inverter unit. And so on until the first inverter unit is successfully bypassed.
It can be seen that if the bypass circuits corresponding to the adjacent inverter units are connected, the whole control system can be provided with a plurality of control loops (one inverter unit and one bypass circuit are one control loop), so that the probability of successfully bypassing the failed inverter unit is greatly increased. When one control loop is in a problem, bypass processing is carried out through other control loops, so that the problem of the whole variable frequency control system caused by the problem of one control loop is avoided.
It will be appreciated that no complex modification of the software is involved in the present utility model, and that the inverter unit simply acts as a repeater when sending the bypass signal from the controller to the corresponding bypass circuit. The third and second bypass circuits send bypass signals to the first bypass circuit, which is also only a forwarding function. The bypass circuit performs bypass processing on the corresponding inverter unit, which is a function of the bypass circuit itself, and can be realized by adopting a bypass circuit in the prior art. In the prior art, the controller also sends a bypass signal to a bypass circuit corresponding to the failed inverter unit, and judges whether the bypass process is successful or not. The utility model is therefore not related to improvements to software.
In one embodiment, referring to fig. 2, the control system provided by the present utility model may further include a voltage transformer 40; the plurality of inverter units form three series circuits corresponding to three phases, each series circuit comprises at least two inverter units 20 connected in series, the input ends of the three series circuits are connected together, and the output ends of the three series circuits are connected with the voltage transformer 40; each serial circuit is used for executing an alternating current-direct current-alternating current conversion process, the voltage transformer is used for converting the first alternating voltage output by each serial circuit into a second alternating voltage and sending the second alternating voltage to the controller 10 so that the controller obtains each corresponding output voltage condition; the second alternating voltage is less than the first alternating voltage.
It can be understood that the input ends of the three series circuits are connected with three-phase alternating current power supplies, each of the three series circuits corresponds to one series circuit, and each series circuit is used for converting input alternating current into direct current and then converting the direct current into output alternating current, so that the degradation of the alternating current is realized. The output ac power of the series circuit can then be supplied to an external device for use. In order to understand the voltage condition output by each serial circuit, the output end of each serial circuit is also connected with a voltage transformer, the voltage transformer converts the first alternating voltage output by the serial circuit into the second alternating voltage and sends the second alternating voltage to the controller, and the controller receives the second alternating voltage, so that the voltage output condition of the serial circuit is known.
That is, the controller is connected to each of the inverter units through the optical fiber, and the controller may transmit the bypass signal to each of the inverter units through the optical fiber, and the inverter unit receiving the bypass signal transmits the bypass signal to the corresponding bypass circuit, thereby implementing the bypass process. In this process, the bypass signal of the controller enters the inverter unit through the optical fiber, and this process may be referred to as a first process. The output end of one series circuit is connected with the controller through a voltage transformer, the first alternating voltage output by the series circuit is changed into the second alternating voltage through the voltage transformer, and the second alternating voltage is further transmitted to the controller, and the process can be called a second process. The first process and the second process are two processes in opposite directions.
In fig. 2, the connection lines between the inverter units and the controller through the optical fibers are not shown, and the bypass circuit and the connection lines corresponding to each inverter unit are not disclosed, that is, the signal circulation process of the first process is not shown. In practice, each inverter unit is connected to the controller, and each inverter unit has a corresponding bypass circuit, see in particular fig. 1.
The voltage transformer is used for converting voltage, for example, the voltage class corresponding to the inversion unit is higher and is larger than 60v, for example, about 110 v. The voltage level corresponding to the controller is relatively low and is generally below 60 v. The voltage transformer converts the first alternating voltage output by the series circuit into the second alternating voltage according to the proportion, so that the voltage conversion is realized.
In one embodiment, the control system provided by the utility model can further comprise a current transformer;
the plurality of inverter units form three corresponding three-phase serial circuits, each serial circuit comprises at least two inverter units connected in series, the input ends of the three serial circuits are connected together, and the output ends of the three serial circuits are respectively connected with the current transformer; each serial circuit is used for executing the conversion process of alternating current-direct current-alternating current, and the current transformer is used for converting the first alternating current output by each serial circuit into second alternating current and sending the second alternating current to the controller so that the controller obtains each corresponding output current condition; the second alternating current is less than the first alternating current.
In order to understand the current condition output by each serial circuit, the output end of each serial circuit is also connected with a current transformer, the voltage influenza device converts the first alternating current output by the serial circuit into the second alternating current, the second alternating current is sent to the controller, and the controller receives the second alternating current, so that the current output condition of the serial circuit is known.
The output end of one series circuit is connected with the controller through a current transformer, the first alternating current output by the series circuit is changed into second alternating current through the current transformer, and the second alternating current is further transmitted to the controller, and the process can be called a third process. The first process and the third process are two processes in opposite directions.
The current transformer is used for converting current, and the current is converted between different levels according to a certain proportion. For example, the current level corresponding to the inverter unit is relatively high, and the current level corresponding to the controller is relatively low. The current transformer converts the first alternating current outputted by the serial circuit into the second alternating current, and current degradation is realized.
In one embodiment, in the control system provided by the utility model, a first wireless transmission module is built in the controller; the system further comprises an intelligent circuit breaker connected with the controller, wherein a second wireless transmission module is arranged in the intelligent circuit breaker, and the intelligent circuit breaker is used for being connected with first external equipment; the intelligent circuit breaker is used for connecting first external equipment; the controller is used for sending a control signal to the first external device through the first wireless transmission module and the second wireless transmission module.
That is, the controller is provided with a first wireless transmission module, the self-energy short circuit device is provided with a second wireless transmission module, communication between the control part in the controller and the control part in the intelligent circuit breaker can be realized through communication between the first wireless transmission module and the second wireless transmission module, transmission of control signals or data is realized, and the communication link is as follows: the control part in the controller-the first wireless transmission module-the second wireless transmission module-the control part in the intelligent breaker-the first external device. The embodiment of the utility model does not need to modify the control logic of the control part in the controller and the control part in the intelligent circuit breaker.
The intelligent circuit breaker may be provided between the power supply and the first external device at the same time. The intelligent circuit breaker has two states, one being a closed state and one being an open state. The power source may provide power to the first external device when in the closed state. When in the open state, the power supply is unable to provide power to the first external device. It can be seen that the self-energy short-circuiting device is equivalent to a knife switch, i.e. a switching device, and has the function of circuit protection. The purpose of setting an automatic circuit breaker is: when the circuit is abnormal, the intelligent circuit breaker can automatically trip, and at the moment, a power supply link between the power supply and the first external equipment is disconnected, so that the circuit protection function is realized.
In one embodiment, the control system provided by the present utility model may further include: the contactor is internally provided with a third wireless transmission module, and is respectively connected with the intelligent circuit breaker and second external equipment; correspondingly, the controller is used for sending control signals to the contactor through the first wireless transmission module, the second wireless transmission module and the third wireless transmission module so that the controller can control the second external equipment to be turned on or turned off.
That is, some external devices may be directly connected to the controller through the intelligent circuit breaker, and such devices are first external devices. Some external devices may be connected to the controller through smart breakers and contactors, such devices being the second external device.
Wherein, be provided with the third wireless transmission module in the contactor, communication link is this moment: the control part in the controller-the first wireless transmission module-the second wireless transmission module-the control part in the intelligent circuit breaker-the third wireless transmission module-the control part in the contactor-the second external device, through which the transmission of control signals or data is achieved.
The contactor is an electric appliance which uses a coil to flow current to generate a magnetic field in industrial electricity so as to close a contact, thereby controlling a load. The contactor is an automatic control electric appliance for switching on or off an ac/dc main circuit and a control circuit. The main control object (i.e. the second external device) is an electric motor, which can also be used for other electric loads, such as electric heaters, electric welders, etc.
Wherein, the intelligent circuit breaker is normally in a closed state and can be opened only when abnormal or fault occurs. And the contactor can cut off or close the circuit at any time according to the requirement. Therefore, in the control process of some external devices, both intelligent circuit breakers and contactors are used, and the intelligent circuit breakers and the contactors are connected in series.
In one embodiment, in the control system provided by the utility model, a first wireless transmission module is built in the controller; the system further comprises: an intelligent panel; a fifth wireless transmission module is arranged in the intelligent panel; the intelligent panel is connected with the controller, and the controller is used for sending data returned by each external device to the intelligent panel for display through the fifth wireless transmission module.
That is, the controller transmits the response data to the intelligent panel after receiving the response data fed back from the external device by means of wireless transmission. Because the intelligent panel is internally provided with the fifth wireless transmission module, the intelligent panel can receive response data in a wireless mode and then display the response data on the intelligent panel.
Wherein, each wireless transmission module can be WIFI module or bluetooth module.
In one embodiment, to ensure stability and reliability of the circuit, the controller may also be configured to: and stopping operation when the number of the non-faulty inverter units is less than a preset value. For example, when there are less than 3 inverter units that have not failed, the control system stops operating.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.
It can be understood that the controller is internally provided with a first wireless transmission module, the intelligent circuit breaker is internally provided with a second wireless transmission module, the intelligent circuit breaker can be connected with first external equipment, and the controller is used for sending control signals to the first external equipment and receiving response data returned by the first external equipment through the first wireless transmission module and the second wireless transmission module. Therefore, the utility model can realize wireless transmission among components, does not need a plurality of connecting cables and wire harnesses, saves line cost, saves manpower wiring cost and time cost, saves input and output boards and further saves hardware cost. And interference among lines can be avoided, so that signal transmission is quicker and more accurate, and the variable frequency control system is more intelligent and miniaturized. Because the internal wiring is reduced, the variable frequency control system is more concise and integrated.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present utility model may be implemented in hardware, software, a pendant, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present utility model in further detail, and are not to be construed as limiting the scope of the utility model, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the utility model.
Claims (8)
1. The utility model provides a variable frequency control system which characterized in that includes controller, a plurality of inverter units and a plurality of bypass circuit, wherein:
the controller is connected with each inversion unit through optical fibers;
the inverter units are in one-to-one correspondence with the bypass circuits, each inverter unit is connected with the corresponding bypass circuit through optical fibers or in a wireless mode, and the voltage levels of each inverter unit and the corresponding bypass circuit are the same; the controller is used for: sending a bypass signal to a first bypass circuit corresponding to a first inversion unit, so that the first bypass circuit bypasses the first inversion unit; the first inversion unit is an inversion unit with faults.
2. The system of claim 1, wherein the power input of each inverter unit is connected to the power input of the corresponding bypass circuit such that the voltage levels of each inverter unit and the corresponding bypass circuit are the same.
3. The system according to claim 1, wherein the bypass circuits corresponding to the adjacent inverter units are connected by optical fibers or by wireless means.
4. The system of claim 1, further comprising a voltage transformer;
the plurality of inverter units form three corresponding three-phase serial circuits, each serial circuit comprises at least two inverter units connected in series, the input ends of the three serial circuits are connected together, and the output ends of the three serial circuits are connected with the voltage transformer; each serial circuit is used for executing the conversion process of alternating current-direct current-alternating current, and the voltage transformer is used for converting the first alternating voltage output by each serial circuit into second alternating voltage and sending the second alternating voltage to the controller so that the controller obtains each corresponding output voltage condition; the second alternating voltage is less than the first alternating voltage.
5. The system of claim 1, further comprising a current transformer;
the plurality of inverter units form three corresponding three-phase serial circuits, each serial circuit comprises at least two inverter units connected in series, the input ends of the three serial circuits are connected together, and the output ends of the three serial circuits are respectively connected with the current transformer; each serial circuit is used for executing the conversion process of alternating current-direct current-alternating current, and the current transformer is used for converting the first alternating current output by each serial circuit into second alternating current and sending the second alternating current to the controller so that the controller obtains each corresponding output current condition; the second alternating current is less than the first alternating current.
6. The system of claim 1, wherein the controller has a first wireless transmission module built-in; the system further comprises an intelligent circuit breaker connected with the controller, wherein a second wireless transmission module is arranged in the intelligent circuit breaker, and the intelligent circuit breaker is used for being connected with first external equipment; the controller is used for sending a control signal to the first external device through the first wireless transmission module and the second wireless transmission module.
7. The system of claim 6, further comprising: the contactor is internally provided with a third wireless transmission module, and is respectively connected with the intelligent circuit breaker and second external equipment;
correspondingly, the controller is used for sending control signals to the contactor through the first wireless transmission module, the second wireless transmission module and the third wireless transmission module so that the controller can control the second external equipment to be turned on or turned off.
8. The system of claim 1, wherein the controller has a first wireless transmission module built-in; the system further comprises: an intelligent panel; a fifth wireless transmission module is arranged in the intelligent panel; the intelligent panel is connected with the controller, and the controller is used for sending data returned by each external device to the intelligent panel for display through the fifth wireless transmission module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222313277.2U CN218976335U (en) | 2022-08-31 | 2022-08-31 | Variable frequency control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222313277.2U CN218976335U (en) | 2022-08-31 | 2022-08-31 | Variable frequency control system |
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| CN218976335U true CN218976335U (en) | 2023-05-05 |
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| CN202222313277.2U Active CN218976335U (en) | 2022-08-31 | 2022-08-31 | Variable frequency control system |
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Address after: 200120 No. 460, Gaoxiang Ring Road, Gaodong Industrial Park, Pudong New Area, Shanghai Patentee after: Yinmengda (Shanghai) Electrical Transmission Equipment Co.,Ltd. Country or region after: China Address before: 200120 No. 460, Gaoxiang Ring Road, Gaodong Industrial Park, Pudong New Area, Shanghai Patentee before: SIEMENS ELECTRICAL DRIVES (SHANGHAI) Ltd. Country or region before: China |
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