High-voltage frequency converter control circuit and system

Abstract

The utility model discloses a high-voltage frequency converter control circuit and system, and relates to the technical field of motor control, and the high-voltage frequency converter control circuit comprises a plurality of state detection modules which are in one-to-one correspondence with a plurality of motors, and are used for detecting the operation states of the corresponding motors, and obtaining state detection signals; the control module is connected with each state detection module and is used for generating a plurality of switch control signals according to the plurality of state detection signals; and the multiple switch modules are connected with the multiple motors in a one-to-one correspondence mode and connected with the high-voltage frequency converters and the control module, and the switch modules are used for controlling the on-off state between the high-voltage frequency converters and the corresponding motors according to the received switch control signals. The whole system does not need to be shut down for maintenance, the problem of isolating the fault motor is solved, and the production efficiency of the high-voltage frequency converter control system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor control, in particular to a high-voltage frequency converter control circuit and system. BACKGROUND

[0002] In a high-voltage frequency converter control system, one high-voltage frequency converter can realize driving multiple motors to run. In the related art, any motor failure requires the entire system to be shut down for maintenance, which greatly affects production efficiency. Therefore, how to isolate the faulty motor and improve the production efficiency of the high-voltage frequency converter control system is an urgent problem to be solved. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a high-voltage frequency converter control circuit and system, which aims to solve the technical problem of how to isolate the faulty motor and improve the production efficiency of the high-voltage frequency converter control system.

[0004] To achieve the above purpose, the high-voltage frequency converter control circuit provided by the present application comprises:

[0005] A plurality of state detection modules are arranged one-to-one corresponding to the plurality of motors, and the state detection module is used to detect the running state of the corresponding motor to obtain a state detection signal;

[0006] A control module is connected with each state detection module, and is used to generate a plurality of switch control signals according to the plurality of state detection signals;

[0007] A plurality of switch modules are connected one-to-one with the plurality of motors and connected with the high-voltage frequency converter and the control module, and the switch module is used to control the on-off state between the high-voltage frequency converter and the corresponding motor according to the received switch control signal.

[0008] In an embodiment, the switch module comprises:

[0009] A first switch unit is connected with the control module and the power supply respectively, and is used to turn on or turn off according to the switch control signal;

[0010] A second switch unit is connected with the first switch unit, and is used to connect or disconnect the power supply according to the on-off state of the first switch unit, and is turned on when the power supply is connected;

[0011] A third switch unit is connected with the second switch unit, the high-voltage frequency converter and the corresponding motor respectively, and is disconnected when the second switch unit is turned on, and controls the high-voltage frequency converter and the corresponding motor to be disconnected.

[0012] In an embodiment, the first switch unit comprises a first relay;

[0013] The first input end of the first relay and the first output end of the first relay are connected with the control module, the second input end of the first relay is connected with the power supply, and the second output end of the first relay is connected with the second switch unit.

[0014] In an embodiment, the second switch unit comprises a second relay.

[0015] The first input end of the second relay is connected with the first switch unit, the first output end of the second relay is grounded, the second input end of the second relay is connected with the power supply, and the second output end of the second relay is connected with the third switch unit.

[0016] In an embodiment, the third switch unit comprises a vacuum contactor.

[0017] The first input end of the vacuum contactor is connected with the second switch unit, the first output end of the vacuum contactor is grounded, the second input end of the vacuum contactor is connected with the high-voltage frequency converter, and the second output end of the vacuum contactor is connected with the motor, wherein when the first input end of the vacuum contactor is connected with the power supply, the second input end of the vacuum contactor is disconnected from the second output end of the vacuum contactor.

[0018] In an embodiment, the high-voltage frequency converter control circuit further comprises a plurality of stop switches.

[0019] The first end of the stop switch is connected with the power supply, the second end of the stop switch is connected with the first input end of the vacuum contactor, and the stop switch is used to turn on or turn off according to the received stop signal to control the on-off state between the power supply and the first input end of the vacuum contactor.

[0020] In an embodiment, the high-voltage frequency converter control circuit further comprises a plurality of start switches.

[0021] The first end of the start switch is connected with the power supply, the second end of the start switch is connected with the third input end of the vacuum contactor, the third output end of the vacuum contactor is grounded, and the start switch is used to turn on or turn off according to the received start signal to control the on-off state between the power supply and the third input end of the vacuum contactor, wherein when the third input end of the vacuum contactor is connected with the power supply, the second input end of the vacuum contactor is connected with the second output end of the vacuum contactor.

[0022] In an embodiment, the state detection module comprises a fault sensor or a current detection device.

[0023] In an embodiment,

[0024] The control module is further used to generate a pre-warning signal when it is determined that the corresponding operating state is an abnormal state according to the state detection signal.

[0025] The high-voltage frequency converter control circuit further comprises:

[0026] The early warning feedback switch is connected with the control module and the user control center respectively, and is used for outputting an early warning feedback signal to the user control center according to the early warning signal.

[0027] The application further provides a high-voltage frequency converter control system.

[0028] A plurality of motors;

[0029] The high-voltage frequency converter control circuit is connected with the plurality of motors.

[0030] The one or more technical solutions provided by the application have at least the following technical effects:

[0031] The application provides a high-voltage frequency converter control circuit, which detects the running states of a plurality of motors one by one through a plurality of state detection modules, controls the on-off states between the high-voltage frequency converter and the motors through a control module according to the running states of the motors, and controls the corresponding switch modules to disconnect the faulty motor from the high-voltage frequency converter according to the received state detection signals when the state detection module detects the motor fault, so as to realize the isolation of the faulty motor, and thus the whole system does not need to be stopped for maintenance, and the production efficiency of the high-voltage frequency converter control system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0033] Figure 1 A structure schematic diagram of a first embodiment of the high-voltage frequency converter control circuit provided by the application;

[0034] Figure 2 A partial circuit schematic diagram of the control module in the high-voltage frequency converter control circuit provided by the application;

[0035] Figure 3 Another partial circuit schematic diagram of the control module in the high-voltage frequency converter control circuit provided by the application;

[0036] Figure 4 A partial circuit schematic diagram of the high-voltage frequency converter control system provided by the application.

[0037] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] It should be noted that, in the present application, the terms “comprising”, “containing” or any other variants thereof are intended to cover non-exclusive containing, so that the device or system comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such device or system. Without more limitation, the elements defined by the statement “comprising” do not exclude the presence of other identical elements in the device or system comprising the element.

[0040] In the present application, unless otherwise explicitly specified and limited, the terms “connection”, “fixation” and the like should be understood in a broad sense, for example, “connection” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, the description of “first”, “second” and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features, or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features.

[0042] In the present application, the suffix such as “module”, “component” or “unit” used to represent elements is only for the convenience of description of the present application, and has no specific meaning. Therefore, “module”, “component” or “unit” can be used mixedly. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0043] In order to solve the above technical problems, the present application provides a high-voltage frequency converter control circuit and system.

[0044] Referring to Figure 1 The embodiment of the present application provides a high-voltage frequency converter control circuit, which can comprise:

[0045] A plurality of state detection modules are arranged one-to-one corresponding to the plurality of motors, and the state detection module is used for detecting the running state of the corresponding motor to obtain a state detection signal.

[0046] A control module is connected with each state detection module, and is used for generating a plurality of switch control signals according to the plurality of state detection signals.

[0047] A plurality of switch modules are connected one-to-one with the plurality of motors, and are connected with the high-voltage frequency converter and the control module, and the switch module is used for controlling the on-off state between the high-voltage frequency converter and the corresponding motor according to the received switch control signal.

[0048] It should be noted that, as Figure 1 shown, the high-voltage frequency converter control circuit can comprise N state detection modules and N switch modules, N is the number of motors in the high-voltage frequency converter control system. One state detection module is used for detecting the running state of one motor, and one switch module is used for controlling the on-off state between one motor and the high-voltage frequency converter.

[0049] The running state of the motor can include normal state and fault state, and the corresponding state detection signal can include normal state signal and fault state signal. When the state detection signal is the fault state signal, the motor is faulty, and the corresponding motor can be disconnected from the high-voltage frequency converter to repair the motor.

[0050] The control module can determine the running state of the motor according to different state detection signals to generate corresponding switch control signals; for example, the control module can output a high-level switch control signal when the state detection signal is a normal state signal, and output a low-level switch control signal when the state detection signal is a fault state signal; conversely, the control module can output a low-level switch control signal when the state detection signal is a normal state signal, and output a high-level switch control signal when the state detection signal is a fault state signal.

[0051] The switch module can be turned on or turned off according to the received switch control signal to connect the high-voltage frequency converter and the corresponding motor, or disconnect the high-voltage frequency converter and the corresponding motor; for example, the switch module can be turned on according to the high-level switch control signal to connect the high-voltage frequency converter and the corresponding motor, and be turned off according to the low-level switch control signal to disconnect the high-voltage frequency converter and the corresponding motor.

[0052] It can be understood that in the process of driving multiple motors by the high-voltage frequency converter, the multiple state detection modules detect the running state of the corresponding motor in real time, and feed back the state detection signal to the control module, so that the control module controls the on-off state of each switch module according to the multiple state detection signals received.

[0053] In a feasible implementation, the state detection module can include a fault sensor or a current detection device.

[0054] It should be noted that the fault sensor is arranged on the motor, and can include any one of a vibration sensor, a temperature sensor, and a speed sensor, and is used to detect the vibration condition, motor temperature, or motor speed, etc. Preferably, the fault sensor is a vibration sensor.

[0055] The current detection device is arranged between the motor and the high-voltage frequency converter, and can include a current transformer and a Hall current sensor, etc., and is used to detect the input current of the motor as the state detection signal of the motor.

[0056] It can be understood that the control module can compare the received state detection signal with the first preset condition to determine the running state of the corresponding motor to generate the corresponding switch control signal. The control module can be a controller such as an MCU (Microcontroller Unit) or a PLC (Programmable Logic Controller).

[0057] Taking the vibration sensor as the state detection module and the PLC as the control module as an example, the PLC is connected with the multiple vibration sensors and receives the vibration signals output by the multiple vibration sensors, compares the vibration signals with the first preset vibration range to determine the running state of each motor. The PLC can include an analog-digital conversion unit and a control unit. The analog-digital conversion unit is connected with the multiple vibration sensors and is used to perform analog-digital conversion on the multiple vibration signals received to obtain multiple digital signals. The control unit is connected with the analog-digital conversion unit and the multiple switch modules, and is used to compare the multiple digital signals received with the first preset vibration range to determine the running state of each motor, generate multiple switch control signals, and control the on-off state of the corresponding switch module. When the control unit compares the digital signal not in the first preset vibration range, it is determined that the running state of the corresponding motor is a fault state, and the corresponding switch module is controlled to disconnect the motor and the high-voltage frequency converter. Figure 2 and Figure 3As shown, the control module includes an analog-to-digital conversion unit U1 and a control unit U2, the pins CH0-CH3 of the analog-to-digital conversion unit U1 are connected with each vibration sensor respectively to receive vibration signals; the output terminal OUT of the control unit U2 is connected with each switch module, and the on-off state of the corresponding switch module is controlled according to the received vibration signals.

[0058] In a possible implementation, the switch module can include:

[0059] a first switch unit connected with the control module and the power supply respectively, for turning on or turning off according to the switch control signal;

[0060] a second switch unit connected with the first switch unit, for connecting or disconnecting the power supply according to the on-off state of the first switch unit, and turning on when the power supply is connected;

[0061] a third switch unit connected with the second switch unit, the high-voltage frequency converter and the corresponding motor respectively, and the third switch unit is disconnected and controls the high-voltage frequency converter to be disconnected with the corresponding motor when the second switch unit is turned on.

[0062] It should be noted that, since the switch control signal output by the control module is a low-voltage control signal, and the high-voltage switching device is between the high-voltage frequency converter and the motor, the switch control signal cannot directly control the high-voltage switching device between the high-voltage frequency converter and the motor. Therefore, in the embodiment, the switch module is realized through three switch units, so as to control the on-off state of the second switch unit between the power supply through the on-off state of the first switch unit controlled by the switch control signal, and the on-off state of the third switch unit is controlled by the second switch unit connected with the power supply, thereby realizing the indirect control of the third switch unit. Wherein, the power supply is an alternating current power supply, and the switch unit can include a relay or a contactor.

[0063] It can be understood that, the first switch unit can be turned on or turned off according to different switch control signals, the second switch unit can be turned on when the power supply is connected, and the third switch unit is controlled to be disconnected, and the second switch unit is disconnected, and the on-off state of the third switch unit is not controlled to change.

[0064] In a possible implementation, the first switch unit can include a first relay;

[0065] The first input terminal of the first relay and the first output terminal of the first relay are connected with the control module, the second input terminal of the first relay is connected with the power supply, and the second output terminal of the first relay is connected with the second switch unit.

[0066] It should be noted that the first switch unit is realized by a relay, and the plurality of first switch units can include first relays KB1-KBN. The first input end 1 of the first relays KB1-KBN is connected with the control unit U2, and the first output end 2 of the first relays KB1-KBN is connected with the control unit U2. The second input end 3 of the first relays KB1-KBN is connected with the fire line L of the alternating current power supply, and the second output end 4 of the first relays KB1-KBN is connected with the second switch unit 1-N in one-to-one correspondence.

[0067] In an example, as shown in Figure 3 the first input end 1 of the first relay KB1 is connected with the control unit U2, and the first output end 2 of the first relay KB1 is connected with the control unit U2. As shown in Figure 4 the second input end 3 of the first relay KB1 is connected with the fire line L of the alternating current power supply, and the second output end 4 of the first relay KB1 is connected with the second switch unit.

[0068] In a specific implementation, when the control unit U2 determines that the running state of the motor 1 is a fault state according to the state detection signal, the control unit U2 outputs a switch control signal from the corresponding output end Y01 to trigger the coil of the first relay KB1 to attract, so that the normally open point of the first relay KB1 is closed, and the alternating current power supply is connected to the second switch unit.

[0069] In a feasible implementation, the second switch unit can include a second relay;

[0070] The first input end of the second relay is connected with the first switch unit, the first output end of the second relay is grounded, the second input end of the second relay is connected with the power supply, and the second output end of the second relay is connected with the third switch unit.

[0071] It should be noted that the second switch unit is realized by a relay, and the plurality of second switch units can include second relays K1-KN. The first input end 1 of the second relays K1-KN is connected with the second output end 4 of the first relays KB1-KBN in one-to-one correspondence, the first output end 3 of the second relays K1-KN is connected with the zero line N of the alternating current power supply, the second input end 3 of the second relays K1-KN is connected with the fire line L of the alternating current power supply, and the second output end 4 of the second relays K1-KN is connected with the third switch unit 1-N in one-to-one correspondence.

[0072] In an example, as shown in Figure 4 the first input end 1 of the second relay K1 is connected with the second output end 4 of the first relay KB1, the first output end 3 of the second relay K1 is connected with the zero line N of the alternating current power supply, the second input end 3 of the second relay K1 is connected with the fire line L of the alternating current power supply, and the second output end 4 of the second relay K1 is connected with the third switch unit.

[0073] In practice, when the control unit U2 determines that the operating state of motor 1 is a fault state based on the status detection signal, it outputs a switch control signal from the corresponding output terminal to trigger the coil of the first relay KB1 to close, thereby connecting the power supply to the second relay K1, triggering the coil of the second relay K1 to close, thereby connecting the power supply to the third switch unit.

[0074] In one feasible implementation, the third switching unit includes a vacuum contactor;

[0075] The first input terminal of the vacuum contactor is connected to the second switching unit, the first output terminal of the vacuum contactor is grounded, the second input terminal of the vacuum contactor is connected to the high-voltage frequency converter, and the second output terminal of the vacuum contactor is connected to the motor. When the first input terminal of the vacuum contactor is connected to the power supply, the second input terminal and the second output terminal of the vacuum contactor are disconnected.

[0076] It should be noted that the third switching unit is implemented through vacuum contactors, and multiple third switching units may include vacuum contactors KM1 to KMN. The first input terminals 1 of vacuum contactors KM1 to KMN are connected one-to-one with the second output terminals 4 of the second relays K1 to KN. The first output terminals 2 of vacuum contactors KM1 to KMN are all connected to the neutral line N of the AC power supply. The second input terminals 3 of vacuum contactors KM1 to KMN are all connected to the high-voltage frequency converter. The second output terminals 4 of vacuum contactors KM1 to KMN are connected one-to-one with the motors 1 to N. The second switching unit is connected to the trip coil of the vacuum contactor. The vacuum contactor model can be JCZ5-160-630 / 12-S.

[0077] In one example, such as Figure 4 As shown, the first input terminal 1 of the vacuum contactor KM1 is connected to the second output terminal 4 of the second relay K1, the first output terminal 2 of the vacuum contactor KM1 is connected to the neutral line N of the AC power supply, the second input terminal 3 of the vacuum contactor KM1 is connected to the high-voltage frequency converter, and the second output terminal 4 of the vacuum contactor KM1 is connected to the motor 1.

[0078] In specific implementation, when the control unit U2 determines that the operating state of motor 1 is a fault state based on the status detection signal, it outputs a switch control signal from the corresponding output terminal to trigger the coil of the first relay KB1 to close, thereby connecting the power supply to the second relay K1, triggering the coil of the second relay K1 to close, thereby connecting the power supply to the trip coil KM1A of the vacuum contactor KM1, thereby triggering the second input terminal 3 and the second output terminal 4 of the vacuum contactor KM1 to disconnect, thereby disconnecting the connection between the high-voltage frequency converter and motor 1.

[0079] In an implementation, the high-voltage frequency converter control circuit can further include a plurality of stop switches.

[0080] The first end of the stop switch is connected with the power supply, and the second end of the stop switch is connected with the first input end of the vacuum contactor, and the stop switch is used to turn on or turn off according to the received stop signal to control the on-off state between the power supply and the first input end of the vacuum contactor.

[0081] It should be noted that the plurality of stop switches can be stop buttons Stop1-StopN, and the stop signal is a manual operation signal of a user, and the stop buttons Stop1-StopN can be used to one-to-one correspondingly control the power supply to access the tripping coils KM1A-KMNA of the vacuum contactors KM1-KMN according to the manual operation signal of the user to control the motors 1-N to be disconnected from the high-voltage frequency converter.

[0082] It can be understood that, as shown in Figure 4 The first end 1 of the stop buttons Stop1-StopN is connected with the live wire L of the alternating current power supply, and the second end 2 of the stop buttons Stop1-StopN is one-to-one correspondingly connected with the first input end 1 of the vacuum contactors KM1-KMN to control the on-off state between the power supply and the tripping coils KM1A-KMNA of the vacuum contactors KM1-KMN.

[0083] In an implementation, the high-voltage frequency converter control circuit can further include a plurality of start switches.

[0084] The first end of the start switch is connected with the power supply, and the second end of the start switch is connected with the third input end of the vacuum contactor, and the third output end of the vacuum contactor is grounded, and the start switch is used to turn on or turn off according to the received start signal to control the on-off state between the power supply and the third input end of the vacuum contactor, wherein when the third input end of the vacuum contactor is connected with the power supply, the second input end of the vacuum contactor is connected with the second output end of the vacuum contactor.

[0085] It should be noted that the start switch can be a start button Start1-StartN, and the start signal is a manual operation signal of a user, and the start buttons Start1-StartN can be used to one-to-one correspondingly control the power supply to access the tripping coils KM1N-KMNB of the vacuum contactors KM1-KMN according to the manual operation signal of the user to control the motors 1-N to be connected with the high-voltage frequency converter.

[0086] It can be understood that, as shown in Figure 4As shown, the first end 1 of the start button Start1-StartN is connected with the live wire L of the alternating current power supply, the second end 2 of the start button Start1-StartN is connected with the third input end 5 of the vacuum contactor KM1-KMN one by one, for controlling the on-off state between the power supply and the closing coil KM1B-KMNB of each vacuum contactor KM1-KMN; and the third output end 6 of the vacuum contactor KM1-KMN is connected with the neutral wire N of the alternating current power supply, the start button Start1-StartN is turned on when receiving the manual operation signal of the user, and the power supply is connected to the closing coil KM1B-KMNB of the vacuum contactor KM1-KMN one by one, to trigger the second input end 3 and the second output end 4 of the vacuum contactor KM1-KMN, so as to connect the high-voltage frequency converter and the motor.

[0087] In an available embodiment, the control module is further configured to generate a warning signal when the corresponding operating state is determined to be an abnormal state according to the state detection signal.

[0088] The high-voltage frequency converter control circuit can further include:

[0089] The warning feedback switch is connected with the control module and the user control center respectively, and is configured to output a warning feedback signal to the user control center according to the warning signal.

[0090] It should be noted that the operating state of the motor can also include an abnormal state, and when the operating state of the motor is the abnormal state, the abnormal state can be fed back to the user control center for abnormal processing by the user control center.

[0091] It can be understood that the control module can compare the received state detection signal with the first preset condition to determine whether the corresponding motor is in a fault state, and compare the received state detection signal with the second preset condition to determine whether the corresponding motor is in an abnormal state. When the control module determines that the operating state of the motor is a fault state, the motor and the high-voltage frequency converter are disconnected by the above-mentioned embodiments. When the control module determines that the operating state of the motor is an abnormal state, it indicates that the motor has an abnormal risk, and the control module can output a warning signal to the user control center for abnormal warning through the warning feedback switch. The range of the first preset condition is greater than the range of the second preset condition.

[0092] Taking the state detection module as a vibration sensor, the first preset condition is a first preset vibration range, and the second preset condition is a second preset vibration range. The second preset vibration range is within the first preset vibration range. The control module can compare the vibration value corresponding to the vibration signal with the maximum value of the first preset vibration range to determine whether the running state of the corresponding motor is a fault state, and compare the vibration value corresponding to the vibration signal with the maximum value of the second preset vibration range to determine whether the running state of the corresponding motor is an abnormal state.

[0093] In addition, it can be understood that the early warning feedback switch can include third relays KA1-KAN, which are used to feed back the early warning feedback signals of the motors 1-N to the user control center. Figure 3 As shown in the figure, the first input end 1 and the second output end 2 of the third relays KA1-KAN are connected with the control module, and the second input end 3 and the second output end 4 of the third relays KA1-KAN are connected with the user control center.

[0094] Therefore, the embodiment provides a high-voltage frequency converter control circuit, which detects the running states of the plurality of motors through the plurality of state detection modules corresponding one by one, controls the on-off state between the high-voltage frequency converter and the motors through the control module according to the running states of the motors, and controls the corresponding switch module to disconnect the fault motor from the high-voltage frequency converter according to the received state detection signal when the state detection module detects the motor fault, so as to realize the isolation of the fault motor, thereby improving the production efficiency of the high-voltage frequency converter control system without stopping the whole system for maintenance.

[0095] In addition, the embodiment only needs to set vibration sensors on the motors in the high-voltage frequency converter control system to detect the vibration conditions of the motors, so as to control the corresponding vacuum contactors of the motors according to the vibration conditions, thereby realizing the isolation of the fault motor and having high applicability.

[0096] In addition, the embodiment further provides a high-voltage frequency converter control system, which can include:

[0097] a plurality of motors;

[0098] The high-voltage frequency converter control circuit described above is connected with the plurality of motors.

[0099] It should be noted that the specific structure of the high-voltage frequency converter control circuit refers to the above-mentioned embodiments. Since the transient detection device of the power device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0100] The above merely describes exemplary embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, made based on the technical concept of the present application, using the content of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A high voltage frequency converter control circuit, characterized in that The high-voltage frequency converter control circuit comprises: A plurality of state detection modules are arranged in one-to-one correspondence with a plurality of motors, and the state detection modules are used for detecting the running state of the corresponding motors to obtain state detection signals; A control module is connected with each of the state detection modules and is used for generating a plurality of switch control signals according to the plurality of state detection signals; A plurality of switch modules are connected in one-to-one correspondence with the plurality of motors and are connected with the high-voltage frequency converter and the control module, and the switch modules are used for controlling the on-off state between the high-voltage frequency converter and the corresponding motor according to the received switch control signals.

2. The high voltage frequency converter control circuit of claim 1, wherein, The switch module comprises: A first switch unit is connected with the control module and a power supply respectively and is used for turning on or turning off according to the switch control signal; A second switch unit is connected with the first switch unit and is used for connecting or disconnecting the power supply according to the on-off state of the first switch unit and turning on when the power supply is connected; A third switch unit is connected with the second switch unit, the high-voltage frequency converter and the corresponding motor respectively, and the third switch unit is disconnected and controls the high-voltage frequency converter and the corresponding motor to be disconnected when the second switch unit is turned on.

3. The high-voltage frequency converter control circuit of claim 2, wherein, The first switch unit comprises a first relay; The first input end of the first relay and the first output end of the first relay are connected with the control module, the second input end of the first relay is connected with the power supply, and the second output end of the first relay is connected with the second switch unit.

4. The high-voltage frequency converter control circuit of claim 2, wherein, The second switch unit comprises a second relay; The first input end of the second relay is connected with the first switch unit, the first output end of the second relay is grounded, the second input end of the second relay is connected with the power supply, and the second output end of the second relay is connected with the third switch unit.

5. The high-voltage frequency converter control circuit of claim 2, wherein, The third switch unit comprises a vacuum contactor; The first input end of the vacuum contactor is connected with the second switch unit, the first output end of the vacuum contactor is grounded, the second input end of the vacuum contactor is connected with the high-voltage frequency converter, and the second output end of the vacuum contactor is connected with the motor, wherein the first input end of the vacuum contactor is connected with the power supply, and the second input end of the vacuum contactor is disconnected from the second output end of the vacuum contactor.

6. The high-voltage frequency converter control circuit of claim 5, wherein, The high-voltage frequency converter control circuit further comprises a plurality of stop switches; The first end of the stop switch is connected with the power supply, the second end of the stop switch is connected with the first input end of the vacuum contactor, and the stop switch is used for turning on or turning off according to the received stop signal to control the on-off state between the power supply and the first input end of the vacuum contactor.

7. The high-voltage frequency converter control circuit of claim 5, wherein, The high-voltage frequency converter control circuit further comprises a plurality of start switches; The first end of the starting switch is connected with the power supply, the second end of the starting switch is connected with the third input end of the vacuum contactor, the third output end of the vacuum contactor is grounded, and the starting switch is used for turning on or turning off according to the received starting signal to control the on-off state between the power supply and the third input end of the vacuum contactor, wherein the second input end of the vacuum contactor is connected with the second output end of the vacuum contactor when the third input end of the vacuum contactor is connected with the power supply.

8. The high-voltage frequency converter control circuit of claim 1, wherein, The state detection module comprises a fault sensor or a current detection device.

9. The high-voltage frequency converter control circuit according to claim 1, wherein, The control module is further configured to generate a pre-warning signal when the corresponding operating state is determined to be an abnormal state according to the state detection signal. The high-voltage frequency converter control circuit further comprises: A pre-warning feedback switch connected with the control module and a user control center, respectively, and configured to output a pre-warning feedback signal to the user control center according to the pre-warning signal.

10. A high voltage frequency converter control system, characterized in that The high-voltage frequency converter control system comprises: A plurality of motors; The high-voltage frequency converter control circuit according to any one of claims 1-9, wherein the high-voltage frequency converter control circuit is connected with the plurality of motors.

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