CN112467969B - Starting control device and method of frequency converter and magnetic suspension system - Google Patents

Starting control device and method of frequency converter and magnetic suspension system Download PDF

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Publication number
CN112467969B
CN112467969B CN202011223371.8A CN202011223371A CN112467969B CN 112467969 B CN112467969 B CN 112467969B CN 202011223371 A CN202011223371 A CN 202011223371A CN 112467969 B CN112467969 B CN 112467969B
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Prior art keywords
module
contact
frequency converter
switch
starting
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CN112467969A (en
Inventor
花峰海
张旗旗
李义丽
丛国强
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

The invention discloses a starting control device and method of a frequency converter and a magnetic suspension system, wherein the device comprises the following components: the sampling unit is used for sampling the voltage on the bus at the bus capacitor at the output side of the rectifying module to obtain the voltage of the electric bus under the condition that the bus capacitor is charged by a charging module in the electric operating mechanism after the frequency converter is electrified; the control module is used for sending a control signal under the condition that the bus voltage reaches a set voltage; the first switch module acts based on the action control signal in the self-starting mode of the frequency converter; the electric operation control module processes the control signal and outputs an action control signal of the first switch module so as to switch on a switching-on circuit in the electric operation mechanism; and under the manual starting mode of the frequency converter, closing the self-starting mode of the frequency converter, and receiving a manual closing signal of a user so as to close a closing circuit in the electric operating mechanism. According to the scheme, the incoming call self-starting can be realized by the frequency converter, so that the safety of frequency converter control is improved.

Description

Starting control device and method of frequency converter and magnetic suspension system
Technical Field
The invention belongs to the technical field of frequency converters, and particularly relates to a starting control device and method of a frequency converter and a magnetic suspension system, in particular to an incoming call self-starting control device and method and a magnetic suspension system applied to a high-power frequency converter.
Background
The magnetic suspension centrifugal machine has the advantages of no oil, no friction, high-speed operation and high efficiency, so the magnetic suspension centrifugal machine is rapidly developed. The magnetic suspension centrifugal machine adopts an advanced magnetic suspension bearing technology, has no contact friction in the operation process, greatly improves the rotating speed of a motor, and has wide application prospect.
The magnetic suspension centrifuge inevitably needs to be powered on and powered off in the testing and practical application processes, and the frequency converter needs to be powered on and switched on again under the condition. The situation of practical application of the high-power frequency converter is difficult to avoid the environment with high temperature, high voltage and high noise, the danger degree is increased by artificial field operation, and the potential safety hazard is brought by artificial improper operation.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a starting control device and method of a frequency converter and a magnetic suspension system, which aim to solve the problem of large potential safety hazard of a manually operated frequency converter in a high-temperature, high-pressure and high-noise environment and achieve the effect of improving the safety of frequency converter control by enabling the frequency converter to realize automatic starting of incoming calls.
The invention provides a starting control device of a frequency converter, wherein the frequency converter comprises: the device comprises an electric operating mechanism, a first switch module, a rectifier module and a bus capacitor; the start control device of the frequency converter comprises: a sampling unit and a control unit; the control unit includes: the control module and the electric operation control module; the sampling unit is configured to sample the voltage on the bus at the bus capacitor on the output side of the rectifying module to obtain an electric bus voltage under the condition that the bus capacitor is charged through a charging module in the electric operating mechanism after the frequency converter is powered on; the control module is configured to send a control signal when the bus voltage reaches a set voltage; the control signal is used for controlling the first switch module to act; the electric operation control module is configured to process the control signal and output an action control signal of the first switch module so as to switch on a switch-on circuit in the electric operation mechanism in a self-starting mode of the frequency converter; the first switch module is configured to act based on the action control signal in a self-starting mode of the frequency converter so as to control a closing circuit in the electric operating mechanism to be closed; and under the manual starting mode of the frequency converter, closing the self-starting mode of the frequency converter, and receiving a manual closing signal of a user to close a closing circuit in the electric operating mechanism.
In some embodiments, the first switch module comprises: a first relay; the contact of the first relay, comprising: the contact device comprises a first contact, a second contact and a third contact, wherein the first contact is a moving contact, and the second contact and the third contact are both static contacts; in the contact connection state of the first relay, when the connection between the first contact and the second contact is switched to the connection between the first contact and the third contact, a closing loop in the electric operating mechanism is conducted, the charging module of the electric operating mechanism stops charging the bus capacitor, the closing circuit in the electric operating mechanism is closed, and the frequency converter is started.
In some embodiments, the electrically operated control module comprises: an electric operation control circuit; the electric operation control circuit comprises: a logic drive circuit and a drive control circuit; the logic driving circuit is configured to perform logic processing on the control signal to obtain a first processed signal; the driving control circuit is configured to perform anti-interference processing on the first processing signal to obtain a second processing signal, which is used as an action control signal for controlling the action of the first switch module.
In some embodiments, the logic driving circuit includes: the device comprises a pull-up module, an input module and an inverting module; wherein, the drive control circuit carries out anti-interference processing on the second processing signal, and the drive control circuit comprises: the input module is configured to receive the control signal and input the control signal to the input end of the inverting module; the pull-up module is configured to perform pull-up processing on the control signal received by the input module; the inverting module is configured to perform inverting processing on the control signal input by the input module to obtain a first processed signal.
In some embodiments, the logic driving circuit further includes: a first filtering module; the first filtering module is configured to filter the power supply of the phase inverting module.
In some embodiments, the drive control circuit includes: the voltage divider module, the switch tube, the current limiting module and the second switch module; wherein, drive control circuit carries out anti-interference processing to first processing signal, obtains the second processing signal, includes: the voltage division module is configured to perform voltage division processing on the first processing signal and then input the first processing signal to the switch tube; the current limiting module is configured to limit the current of a power supply of the drive control circuit and then provide the current to the switching tube; the second switch module is configured to be powered on and output a second processing signal when the switch tube is conducted.
In some embodiments, the driving control circuit further includes: a display module; the display module is arranged between the current limiting module and the second switch module and is configured to display the state that the second switch module is powered on and outputs the second processing signal under the condition that the second switch module is powered on and outputs the second processing signal.
In some embodiments, the driving control circuit further includes: a freewheel circuit; the free-wheeling circuit is configured to provide an energy release loop when the second switching module is powered off.
In some embodiments, the driving control circuit further includes: a second filtering module; the second filtering module is configured to filter the first processing signal and then input the first processing signal to the switch tube through the voltage dividing module.
In some embodiments, the second switch module comprises: a second relay; the contact of the second relay, comprising: a first contact and a second contact; the first contact is a movable contact and is connected with a power supply of the drive control circuit; the second contact is a static contact and is connected to the first switch module; under the condition that the contact of the second relay is the first contact and the second contact, the electric operation control module further comprises: a mode selection switch; the mode selection switch is arranged between the second relay and the first switch module, and the starting mode of the frequency converter is a self-starting mode under the condition that the mode selection switch is closed; and under the condition that the mode selection switch is disconnected, the starting mode of the frequency converter is a manual starting mode.
In some embodiments, the second switch module comprises: a third relay; the contact of the third relay comprising: a first contact, a second contact, and a third contact; the first contact is a movable contact and is connected with a power supply of the drive control circuit; the second contact and the third contact are both static contacts; under the condition that the contacts of the third relay are a first contact, a second contact and a third contact, and under the condition that the starting mode of the frequency converter needs to be a self-starting mode, the second contact of the third relay is connected to the first switch module, and the second contact of the third relay is set to be a normally open contact; and under the condition that the starting mode of the frequency converter needs to be a manual starting mode, the third contact of the third relay is set to be a normally closed contact.
In some embodiments, the switching tube comprises: an NPN type triode or a PNP type triode; under the condition that the switching tube is an NPN type triode, the base electrode of the NPN type triode is connected to the voltage division module, the collector electrode of the NPN type triode is connected to the current limiting module and the second switching module, and the emitting electrode of the NPN type triode is grounded; under the condition that the switch tube is a PNP type triode, the base electrode of the PNP type triode is connected to the voltage division module, the emitting electrode of the PNP type triode is connected to the current limiting module and the second switch module, and the collecting electrode of the NPN type triode is grounded.
In accordance with the above apparatus, a magnetic levitation system is provided in another aspect of the present invention, including: the start control device of the frequency converter.
In another aspect, the present invention provides a method for controlling a start of a frequency converter, where the frequency converter includes: the device comprises an electric operating mechanism, a first switch module, a rectifier module and a bus capacitor; the starting control method of the frequency converter comprises the following steps: through a sampling unit, under the condition that the bus capacitor is charged through a charging module in the electric operating mechanism after the frequency converter is powered on, sampling the voltage on the bus at the bus capacitor position on the output side of the rectifying module to obtain the voltage of the electric bus; sending a control signal through a control module under the condition that the bus voltage reaches a set voltage; the control signal is used for controlling the first switch module to act; processing the control signal through an electric operation control module in a self-starting mode of the frequency converter, and outputting an action control signal of the first switch module so as to switch on a switching-on circuit in the electric operation mechanism; through a first switch module, under the self-starting mode of the frequency converter, the first switch module acts based on the action control signal to control a closing circuit in the electric operating mechanism to be closed; and under the manual starting mode of the frequency converter, closing the self-starting mode of the frequency converter, and receiving a manual closing signal of a user to close a closing circuit in the electric operating mechanism.
Therefore, according to the scheme of the invention, the incoming call self-starting control circuit is arranged, the manual starting mode or the incoming call self-starting mode is selected according to the actual situation on site, and the incoming call self-starting of the frequency converter can be realized under the environment of high temperature, high voltage and high noise, so that the safety of the control of the frequency converter is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a start control device of a frequency converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an incoming call self-starting control flow of an embodiment of a high-power frequency converter;
FIG. 3 is a schematic diagram of an embodiment of an incoming call self-start control circuit of a frequency converter;
FIG. 4 is a schematic diagram of a charging state structure of an embodiment of an incoming call self-starting control circuit of a frequency converter;
FIG. 5 is a structural diagram illustrating a power-up completion state of an embodiment of an incoming call self-start control circuit of a frequency converter;
FIG. 6 is a schematic diagram of an embodiment of a control circuit for an electrically operated (i.e., electrically operated mechanism);
FIG. 7 is a schematic diagram of another embodiment of a control circuit for an electrically operated (i.e., electrically operated mechanism);
FIG. 8 is a schematic diagram of a further embodiment of a control circuit for an electrically operated (i.e., electrically operated mechanism);
fig. 9 is a flowchart illustrating a start control method of a frequency converter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, there is provided a start control apparatus of a frequency converter. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The frequency converter comprises: an electric operating mechanism, a first switch module (such as an external relay K1), a rectifier module, and a bus capacitor (such as a bus capacitor C)Bus bar) Discharge module (e.g. discharge resistor R)Discharge of electricity) And an inverter module. The electric operating mechanism includes: a charging module (such as an RS module formed by a charging resistor and a charging switch), a switching-off loop and a switching-on loop. An access terminal of the alternating current power supply is connected to the rectification module through the charging module, an output side of the rectification module is connected to the inversion module after being provided with a bus capacitor and a discharge resistor in parallel, and an output side of the inversion module is connected to the motor M. The start control device of the frequency converter comprises: a sampling unit (such as a bus voltage sampling device) and a control unit (such as a main control board). The control unit includes: control module (such as DSP in main control board) and electric operation control module。
The sampling unit is configured to sample the voltage on the bus at the bus capacitor on the output side of the rectifying module to obtain the voltage of the electric bus under the condition that the bus capacitor is charged through the charging module in the electric operating mechanism after the frequency converter is powered on, namely, the bus capacitor is charged by the current through the charging module in the electric operating mechanism after the frequency converter is powered on. The sampling unit may be a sampling resistor.
The control module is configured to send a control signal when the bus voltage reaches a set voltage. The set voltage is a bus voltage value at which closing of a closing circuit in the electric operating mechanism is permitted. The control signal is used for controlling the first switch module to act. Specifically, after the frequency converter is powered on, the frequency converter firstly enters a charging loop, and the main control board is powered on at the moment (namely, the main control board is powered on the frequency converter). Furthermore, the main control board judges the bus voltage, and when the bus voltage reaches a state that the switch-on can be realized, a central processing unit (DSP) of the main control board sends a control signal to a control circuit of the electric operation (namely, an electric operation mechanism).
The electric operation control module is configured to process the control signal and output an action control signal of the first switch module so as to close a closing circuit in the electric operation mechanism in a self-starting mode of the frequency converter. If the electric operating mechanism is controlled to be switched on, the control signal can control the action of external electric operation (namely the electric operating mechanism) to complete the function of self-starting when an incoming call is received.
The first switch module is configured to act based on the action control signal in a self-starting mode of the frequency converter so as to control a closing circuit in the electric operating mechanism to be closed.
In some embodiments, the first switch module comprises: a first relay (e.g., external relay K1). The contact of the first relay, comprising: the contact comprises a first contact, a second contact and a third contact, wherein the first contact is a moving contact, and the second contact and the third contact are both static contacts.
That is, the contacts of the first relay include single pole double throw contacts, a pole contact (i.e., a first contact of the first relay, such as the contact 1 of the external relay) of the single pole double throw contacts is connected to the power supply of the electric operating mechanism, a first throw contact (i.e., a second contact of the first relay, such as the contact 2 of the external relay) of the single pole double throw contacts is connected to a closing circuit (e.g., the closing circuit C11) of the electric operating mechanism, and a second throw contact (i.e., a third contact of the first relay, such as the contact 3 of the external relay) of the single pole double throw contacts is connected to an opening circuit (e.g., the opening circuit a1) of the electric operating mechanism.
In the contact connection state of the first relay, when the connection between the first contact and the second contact is switched to the connection between the first contact and the third contact, a closing loop in the electric operating mechanism is conducted, the charging module of the electric operating mechanism stops charging the bus capacitor, the closing circuit in the electric operating mechanism is closed, and the frequency converter is started.
Specifically, after the inverter is powered off and powered on again, the inverter enters a charging state, and current flows through a charging resistor R (such as a resistor R in an RS module)RResistance RSAnd a resistance RT) To bus capacitor CBus barAnd (6) charging. The electrically operated (i.e. electrically operated) opening circuit a1 is now closed. The main control board is powered on, when the main control board is judged by the bus voltage sampling device and the charging state is detected to reach a state capable of being switched on, the DSP transmits a control signal, the control signal is processed by a control circuit of an electric operation mechanism to output a control signal of +24VJDQ, the control signal of the +24VJDQ is sent to an external manual switch K, the manual switch K is closed when the control circuit is started, the control signal of the +24VJDQ is sent to an external relay K1 through the manual switch K, the control signal of the +24VJDQ controls a coil of the external relay K1 to be powered on, a contact of the external relay K1 is switched from 1-2 to 1-3 for connection, a switching-on loop C11 of the electric operation mechanism is switched on, and at the moment, a switch (such as a contact S) in an RS module of the electric operation mechanism is switched onRContact SSContact ST) Combination of Chinese herbsAnd closing the brake to finish the power-on self-starting operation, so as to realize the function of controlling the power-on self-starting of the frequency converter by the DSP after the frequency converter is powered on.
The electric operation control module is also configured to close the self-starting mode of the frequency converter in the manual starting mode of the frequency converter and receive a manual closing signal of a user so as to close a closing circuit in the electric operating mechanism. If the manual operation electric operation switch-on (namely the electric operation mechanism) is performed, the incoming call self-starting function is closed, and at the moment, the manual switch-on is required to complete the starting function of the frequency converter, namely, the power-on operation is manually completed.
Specifically, after the frequency converter is powered on, the DSP sends out a signal, and the signal is processed by a control circuit (namely an electric operation control circuit) of an electric operation (namely an electric operation mechanism) and controls an external device to act, so that the starting of the frequency converter is completed. After power-up is completed, the switch (e.g. contact S) in RS module of electric operation (i.e. electric operation mechanism)RContact SSContact ST) Closed, current passing through a switch (e.g., contact S) in an electrically operated (i.e., electrically operated mechanism) RS moduleRContact SSContact ST) The current flows to a rear circuit (such as a rectifier module) to charge the resistor R (such as the resistor R in the RS module)RResistance RSAnd a resistance RT) Short out of the circuit.
Therefore, through the control logic of the high-power frequency converter automatically started by the incoming call, a manual starting mode or an incoming call automatic starting mode can be selected according to the actual situation on site, the problem that the frequency converter needs to be manually powered on and switched on again due to power failure is solved for some special occasions inconvenient to be manually operated, the test problem caused by the problem that manual operation is needed for frequent power failure starting and stopping is solved in the test process, and the safety of power-on starting control of the frequency converter is improved.
In some embodiments, the electrically operated control module comprises: an electric operation control circuit. The electric operation control circuit comprises: a logic driving circuit and a driving control circuit.
The logic driving circuit is configured to perform logic processing on the control signal to obtain a first processed signal, so as to ensure reliability of the control signal.
The driving control circuit is configured to perform anti-interference processing on the first processing signal to obtain a second processing signal, which is used as an action control signal for controlling the action of the first switch module.
Specifically, the electric operation (i.e. electric operation mechanism) control circuit processes the control signal sent by the DSP and sends the processed signal to an external device (such as an external relay K1), so that the reliability and the control capability of the processed signal can be improved.
In some embodiments, the logic driving circuit includes: a pull-up block (e.g., pull-up resistor R1), an input block (e.g., resistor R2), and an inversion block (i.e., logic chip U1 such as an inverter).
Wherein, the drive control circuit carries out anti-interference processing on the second processing signal, and the drive control circuit comprises:
the input module is configured to receive the control signal and input the control signal to the input end of the inverting module.
The pull-up module is configured to perform pull-up processing on the control signal received by the input module.
The inverting module is configured to perform inverting processing on the control signal input by the input module to obtain a first processed signal.
Specifically, the logic chip U1 (e.g., an inverter) functions to output the input signal levels at opposite levels. The signal that DSP sent gives the 1 foot input end to logic chip U1 through resistance R2, and the 1 foot input end of logic chip U1 is through pull-up resistance R1 to +3.3V, guarantees when DSP does not work, keeps low level output. The level conversion is carried out through the logic chip U1, and the level conversion is output from a pin 2 of the logic chip U1. The reliability of the control signal is ensured by the signal filtering and logic conversion chip U1.
In some embodiments, the logic driving circuit further includes: a first filtering module (such as an RC filter formed by a resistor R3 and a capacitor C1). The first filtering module is configured to filter the power supply of the phase inverting module.
In some embodiments, the drive control circuit includes: the circuit comprises a voltage division module (such as a voltage division module consisting of a resistor R4 and a resistor R5), a switching tube (such as a triode), a current limiting module (such as a current limiting resistor R6) and a second switching module (such as a plate relay).
Wherein, drive control circuit carries out anti-interference processing to first processing signal, obtains the second processing signal, includes:
the voltage division module is configured to perform voltage division processing on the first processing signal and then input the first processing signal to the switch tube.
The current limiting module is configured to limit the current of the power supply of the drive control circuit and then provide the current to the switching tube.
The second switch module is configured to be powered on and output a second processing signal when the switch tube is conducted.
In some embodiments, the driving control circuit further includes: a display module (e.g., light emitting diode D2). The display module is arranged between the current limiting module and the second switch module and is configured to display the state that the second switch module is powered on and outputs the second processing signal under the condition that the second switch module is powered on and outputs the second processing signal.
In some embodiments, the driving control circuit further includes: a freewheeling circuit (e.g., freewheeling diode D1). The free-wheeling circuit is configured to provide an energy release loop when the second switching module is powered off.
In some embodiments, the driving control circuit further includes: and a second filtering module (such as an RC filter consisting of a resistor R4 and a capacitor C2). The second filtering module is configured to filter the first processing signal and then input the first processing signal to the switch tube through the voltage dividing module.
In some embodiments, the second switch module comprises: a second relay (e.g., a panel relay K2). The contact of the second relay, comprising: a first contact and a second contact. The first contact is a movable contact and is connected with a power supply of the drive control circuit. The second contact is a stationary contact connected to the first switch module (e.g., to a coil of an external relay K1).
Under the condition that the contact of the second relay is the first contact and the second contact, the electric operation control module further comprises: a mode selection switch (e.g., a manual switch K). The mode selection switch is arranged between the second relay and the first switch module, and the starting mode of the frequency converter is a self-starting mode under the condition that the mode selection switch is closed. And under the condition that the mode selection switch is disconnected, the starting mode of the frequency converter is a manual starting mode.
Specifically, the automatic starting function of the incoming call can be selected to be turned off according to actual conditions, that is, the manual switch K can be turned on, so that manual closing is needed to complete the power-on starting function.
In some embodiments, the second switch module comprises: a third relay (e.g., a panel relay K3). The contact of the third relay comprising: a first contact, a second contact, and a third contact. The first contact is a movable contact and is connected with a power supply of the drive control circuit. The second contact and the third contact are both stationary contacts.
In case the contacts of the third relay are the first, second and third contacts, the second contact of the third relay is connected to the first switch module (e.g. to the coil of the external relay K1) and the second contact of the third relay is set as a normally open contact, in case the start mode of the frequency converter needs to be a self-start mode. And under the condition that the starting mode of the frequency converter needs to be a manual starting mode, the third contact of the third relay is set to be a normally closed contact.
Specifically, the relay K3 between another board in the control circuit of the electric operation (i.e. the electric operation mechanism) can use a two-gear relay, so that an external manual switch K is not needed, a 2-pin normally-open contact of the +24VJDQ terminal inter-board relay K3 is needed when self-starting is needed, and a 3-pin normally-closed contact of the inter-board relay K3 is not needed.
In some embodiments, the switching tube comprises: an NPN type triode or a PNP type triode.
Under the condition that the switching tube is an NPN type triode, the base electrode of the NPN type triode is connected to the voltage division module, the collector electrode of the NPN type triode is connected to the current limiting module and the second switching module, and the emitting electrode of the NPN type triode is grounded.
Specifically, a transistor (such as an NPN transistor) drives a circuit of the inter-board relay K2, and the signal control capability is improved by controlling the inter-board relay K2 through the transistor. During signal transmission, the interference is difficult to avoid. The signal is subjected to RC filtering through the resistor R4 and the capacitor C2 to improve the anti-interference capability of the signal, the signal is subjected to voltage division through the resistor R5 and is supplied to a base electrode of a pin 1 of the triode, and an emitter of a pin 2 of the triode is grounded. The triode is an NPN type triode, and when high level is supplied to the base electrode of the triode, the triode is conducted in a saturation mode. The freewheeling diode D1 is used for releasing energy when the coil of the interplate relay K2 is disconnected, and provides a release channel for the energy. After the triode is conducted, the current flows to the 3-pin collector of the triode from +24V through the current limiting resistor R6 and the light emitting diode D2. At this time, the collector level of the 3 pin of the triode is pulled down, the pulled down level is provided for the 2 pin of the inter-board relay K2, the coil of the inter-board relay K2 is electrically connected with a contact, and therefore +24V is provided for the 2 pin +24VJDQ of the inter-board relay K2 to the external relay K1 through the 1 pin of the inter-board relay K2, and therefore the external device is controlled. With the panel relay K2 closed, the light emitting diode D2 is extinguished. The strong electric device is controlled by small signals through the control capability of amplifying signals step by step of 2-stage relays (an inter-board relay K2 and an external relay K1).
Under the condition that the switch tube is a PNP type triode, the base electrode of the PNP type triode is connected to the voltage division module, the emitting electrode of the PNP type triode is connected to the current limiting module and the second switch module, and the collecting electrode of the NPN type triode is grounded.
Specifically, the type of the triode used by the control circuit of the electric operation (i.e. the electric operation mechanism) can be replaced by a PNP type triode according to the actual situation.
In the above example, the bus voltage is judged by the main control board, when the bus voltage reaches a state that the switch-on is possible, the central control unit (DSP) of the main control board sends a control signal to the control circuit of the electric operator (i.e. the electric operating mechanism), and the manual switch K is adjusted to select whether the incoming call self-starting function is required. If the manual switch K is closed, namely the electric operating mechanism is controlled to be switched on, the control signal can control the action of external electric operation (namely the electric operating mechanism) to complete the function of self-starting when an incoming call is received. If the manual switch K is disconnected, namely the manual operation electric operation switch-on (namely the electric operation mechanism) is performed, the incoming call self-starting function is closed, and at the moment, the manual switch-on is needed to complete the starting function of the frequency converter, namely the power-on operation is manually completed. Therefore, a manual starting mode or an incoming call self-starting mode can be selected according to actual conditions on site, the application performance of the frequency converter is improved, the requirements of some special application occasions can be met, the reliability and the safety of starting control of the frequency converter are improved, and the manual work amount and the work risk degree are reduced.
Through a large number of tests, the technical scheme of the invention is adopted, the incoming call self-starting control circuit is arranged, the manual starting mode or the incoming call self-starting mode is selected according to the actual situation on site, and the incoming call self-starting of the frequency converter can be realized under the environment with high temperature, high voltage and high noise, so that the control safety of the frequency converter is improved.
According to an embodiment of the invention, a magnetic levitation system corresponding to the starting control device of the frequency converter is also provided. The magnetic levitation system may include: the start control device of the frequency converter.
In order to adapt to the application of magnetic suspension centrifuges in different environments, a special frequency converter with an incoming call self-starting function for centrifuges is required to be developed for special occasions which are not suitable for manual operation. The frequency converter has a manual closing starting function in a related scheme, also has an incoming call self-starting function, and can be switched into a starting mode at will in the face of different application occasions.
In some embodiments, the scheme of the invention provides an incoming call self-starting control device and method applied to a high-power frequency converter, namely, a control logic and a control device of the incoming call self-starting high-power frequency converter, which can select a manual starting mode or an incoming call self-starting mode according to the actual situation on site, are simple and reliable, improve the application performance of the frequency converter, enable the frequency converter to meet the requirements of some special application occasions, and have simple structure and low cost. Therefore, for some special occasions inconvenient for manual operation, the problem that the frequency converter needs to be manually powered on again for switching on due to power failure is solved; in the test process, the test problem caused by the problem that manual operation is needed when the power is cut off and the start and stop are frequently carried out is solved.
Specifically, the scheme of the invention adopts a means of controlling the external electric operation (namely the electric operation mechanism) by the DSP, and controls the action of the external electric operation (namely the electric operation mechanism) by the control signal of the DSP for some occasions inconvenient for manual operation, thereby solving the problem that the frequency converter needs manual switch-on after power failure and restart, and achieving the effect of improving the remote control capability of the frequency converter.
According to the scheme of the invention, the starting mode after power-on can be manually selected according to the actual situation through the control logic after the power-on of the frequency converter. By arranging the manual switch (such as the manual switch K), the problem that two modes of manual closing electrification and incoming call self-starting can be switched at will is solved, so that the two modes of manual closing electrification and incoming call self-starting can be switched at will, and the effect of the application occasion of the frequency converter is improved.
In some embodiments, the solution of the present invention is applicable to the field of frequency converter control of magnetic suspension centrifuges, and in order to make the embodiment of the solution of the present invention more clearly understood by those skilled in the art, the technical solution in the embodiment of the present invention will be described below in conjunction with specific operations and with reference to the examples shown in fig. 2 to 8.
Fig. 2 is a schematic diagram of an incoming call self-starting control flow applied to an embodiment of a high-power frequency converter.
In order to solve the problem that the main loop needs to be closed manually when the frequency converter is powered on again after being powered off, the embodiment of the scheme of the invention provides an incoming call self-starting control device and method applied to a high-power frequency converter, and the logic flow of the incoming call self-starting control device is shown in fig. 2. As shown in fig. 2, the incoming call self-starting control process of the high-power frequency converter includes:
step 1, after the frequency converter is powered on, the charging circuit is firstly entered, and at the moment, the main control board is powered on (namely, the main control board is powered on the frequency converter). And then, the main control board judges the bus voltage, when the bus voltage reaches a state that the switch-on can be realized, a central processing unit (DSP) of the main control board sends a control signal to a control circuit of an electric operator (namely an electric operating mechanism), and whether the function of automatically starting the incoming call is needed or not is selected by adjusting a manual switch K.
And 2, if the manual switch K is closed, namely the electric operating mechanism is controlled to be switched on, the control signal can control the external electric operation (namely the electric operating mechanism) to act, and the function of automatically starting when an incoming call is received is completed.
And 3, if the manual switch K is disconnected, namely, manually operating an electric operation switch (namely, an electric operation mechanism), closing the incoming call self-starting function, and finishing the starting function of the frequency converter by manually switching on the switch, namely, manually finishing the power-on operation.
Fig. 3 is a schematic structural diagram of an embodiment of an incoming call self-starting control circuit of a frequency converter. As shown in fig. 3, the incoming call self-starting control circuit of the frequency converter includes: electric operating mechanism, external relay K1, manual switch K, main control board, bus voltage sampling device, rectifier module and bus capacitor CBus barDischarge resistor RDischarge of electricityAnd an inverter module. An electrically operated mechanism comprising: the control assembly of alternating current power supply, separating brake circuit and closing circuit. A control assembly for an ac power source, comprising: the switching system comprises a first group of RS modules connected with a first connecting end (such as an R end) of an alternating current power supply, a second group of RS modules connected with the first connecting end (such as an S end) of the alternating current power supply, a third group of RS modules connected with the first connecting end (such as a T end) of the alternating current power supply, a switching-off loop and a switching-on loop. A first set of RS modules comprising: parallel arranged resistor RRAnd switch SR. A second set of RS modules comprising: parallel arranged resistor RSAnd switch SS. A third set of RS modules comprising: parallel arranged resistor RTAnd switch ST. A first set of RS modules, a second set of RS modules and a third set of RS modules which are respectively connected to the rectifier module and the output of the rectifier moduleThe output end is provided with a bus capacitor C in parallelBus barAnd a discharge resistor RDischarge of electricity。
In the example shown in fig. 3, the opening circuit a1 is connected to the 3 rd end of the contact of the external relay K1, the closing circuit C11 is connected to the 2 nd end of the contact of the external relay K1, and the 1 st end of the contact of the external relay K1 is connected to the terminal V2. And a coil of the external relay K1 is connected to an electric operation control circuit in the main control board through a manual switch K. And the DSP in the main control board is respectively connected with the bus voltage sampling device and the electric operation control circuit. And the bus voltage sampling device is connected to the bus, namely connected to the output end of the rectifying module. The terminals V1 and V2 are power supply terminals of the electric operating mechanism.
Specifically, the terminals V1 and V2 are power supply terminals of the electrically operated coil. When the terminal V1 and the terminal V2 supply power of 220V, a closing loop is closed, and the electric operation is closed; the opening loop is closed, and the electric operation is disconnected.
As shown in fig. 3, after the frequency converter is powered on, the DSP sends out a signal, which is processed by a control circuit (i.e., an electric operation control circuit) of the electric operation (i.e., an electric operation mechanism) and controls an external device to operate, thereby completing the start of the frequency converter.
Fig. 4 is a schematic diagram of a charging state structure of an incoming call self-starting control circuit of the frequency converter according to an embodiment. As shown in FIG. 4, after the inverter is powered off and powered up again, the inverter enters a charging state, and current flows through a charging resistor R (e.g., a resistor R in the RS module)RResistance RSAnd a resistance RT) To bus capacitor CBus barAnd (6) charging. The electrically operated (i.e. electrically operated) opening circuit a1 is now closed. The main control board is electrified, when the main control board is judged by the bus voltage sampling device and the charging state is detected to reach a state capable of being switched on, the DSP transmits a control signal, the control signal is processed by a control circuit of an electric operation mechanism to output a control signal of +24VJDQ, the control signal of the +24VJDQ is sent to an external manual switch K, the manual switch K is closed during self-starting, the control signal of the +24VJDQ is sent to an external relay K1 through the manual switch K, the control signal of the +24VJDQ controls a coil of the external relay K1 to be electrified, and a contact of the external relay K1 is connected from 1-2 to 1-3 for being connected with each otherWhen the closing circuit C11 of the electric operator (i.e. electric operating mechanism) is turned on, the switch (e.g. contact S) in the RS module of the electric operator (i.e. electric operating mechanism) is turned onRContact SSContact ST) Closing the switch, and completing the power-on self-starting operation, so as to realize the function of controlling the power-on self-starting of the frequency converter by the DSP after the frequency converter is powered on.
Of course, the automatic starting function of the incoming call can be selected to be turned off according to actual conditions, namely the manual switch K can be turned on, and then manual closing is needed to complete the power-on starting function.
Fig. 5 is a structural diagram illustrating a power-up completion state of an incoming call self-start control circuit of the frequency converter according to an embodiment.
As shown in FIG. 5, after power-up is complete, the switch (e.g., contact S) in the RS module of the electrically operated (i.e., electrically operated mechanism) is electrically operatedRContact SSContact ST) Closed, current passing through a switch (e.g., contact S) in an electrically operated (i.e., electrically operated mechanism) RS moduleRContact SSContact ST) The current flows to a rear circuit (such as a rectifier module) to charge the resistor R (such as the resistor R in the RS module)RResistance RSAnd a resistance RT) Short out of the circuit.
Fig. 6 is a schematic diagram of an embodiment of a control circuit for an electrically operated (i.e., electrically operated mechanism). As shown in fig. 6, the electrically operated (i.e., electrically operated mechanism) control circuit processes the control signal from the DSP and provides the processed signal to an external device (e.g., external relay K1).
In the example shown in fig. 6, the first part is a logic driving circuit. The logic chip U1 (e.g., an inverter) functions to output the input signal level at the opposite level. The signal that DSP sent gives the 1 foot input end to logic chip U1 through resistance R2, and the 1 foot input end of logic chip U1 is through pull-up resistance R1 to +3.3V, guarantees when DSP does not work, keeps low level output. The level conversion is carried out through the logic chip U1, and the level conversion is output from a pin 2 of the logic chip U1. The reliability of the control signal is ensured by the signal filtering and logic conversion chip U1.
In the example shown in fig. 6, the second part is a circuit in which a transistor (such as an NPN transistor) drives the inter-board relay K2, and the signal control capability is improved by controlling the inter-board relay K2 through the transistor. During signal transmission, the interference is difficult to avoid. The signal is subjected to RC filtering through the resistor R4 and the capacitor C2 to improve the anti-interference capability of the signal, the signal is subjected to voltage division through the resistor R5 and is supplied to a base electrode of a pin 1 of the triode, and an emitter of a pin 2 of the triode is grounded. The triode is an NPN type triode, and when high level is supplied to the base electrode of the triode, the triode is conducted in a saturation mode.
In the example shown in fig. 6, the freewheeling diode D1 functions to release energy when the coil of the interplate relay K2 is open, providing a path for the energy to be released. After the triode is conducted, the current flows to the 3-pin collector of the triode from +24V through the current limiting resistor R6 and the light emitting diode D2. At this time, the collector level of the 3 pin of the triode is pulled down, the pulled down level is provided for the 2 pin of the inter-board relay K2, the coil of the inter-board relay K2 is electrically connected with a contact, and therefore +24V is provided for the 2 pin +24VJDQ of the inter-board relay K2 to the external relay K1 through the 1 pin of the inter-board relay K2, and therefore the external device is controlled. With the panel relay K2 closed, the light emitting diode D2 is extinguished. The strong electric device is controlled by small signals through the control capability of amplifying signals step by step of 2-stage relays (an inter-board relay K2 and an external relay K1).
The scheme of the invention is not only suitable for the high-power frequency converter, but also can select proper electric operation (namely an electric operation mechanism) to be integrated in the low-power frequency converter according to the power taking mode.
Specifically, selecting a suitable electric operation (i.e., an electric operation mechanism) according to the power-taking mode to integrate into the low-power frequency converter may include: an electric operating mechanism with the power supply voltage level of 220V is used; the method is also applicable if a low-power frequency converter is used for electric operation or a contactor with a voltage class (such as 24V).
Fig. 7 is a schematic diagram of another embodiment of a control circuit for an electrically operated (i.e., electrically operated mechanism). As shown in fig. 7, the type of the triode used in the control circuit of the electrical operation (i.e., the electrical operation mechanism) can be replaced by a PNP type triode according to the actual situation, as shown in fig. 7, the circuit connection mode needs to ground the collector of the 3 pins of the PNP type triode, and the relay between the emitter plates of the 2 pins of the PNP type triode can also achieve the same effect.
Fig. 8 is a schematic diagram of a control circuit for an electrically operated (i.e., electrically operated mechanism) according to yet another embodiment. As shown in fig. 8, the relay K3 between the other boards in the control circuit of the electric operation (i.e. the electric operation mechanism) can use a two-stage relay, so that an external manual switch K is not needed, a 2-pin normally-open contact of the +24VJDQ terminal inter-board relay K3 is needed when self-starting is needed, and a 3-pin normally-closed contact of the inter-board relay K3 is not needed.
Wherein, 2 feet of the relay K3 are normally open contacts, and 3 feet are normally closed contacts. When the coil of the relay K3 is not energized, the state is 1-3 connections of the relay K3. When the coil of the relay K3 is energized, the state is that 1-2 of the relay K3 is connected. When the self-starting function is needed, the +24VJDQ terminal is connected with the 2-pin normally-open contact of the inter-plate relay K3. After the coil of the relay K3 is electrified, the 1-2 contacts of the relay K3 are closed, and a +24VJDQ signal is transmitted to the relay K1. When the self-starting function is not needed, the 3-pin normally closed contact of the time-coupled plate relay K3 is not needed. The normally open contact is defined as the contact in the open state when the relay is not electrified, and the contact in the closed state is the normally closed contact.
Since the processing and functions of the magnetic levitation system of the present embodiment substantially correspond to the embodiments, principles, and examples of the apparatus, reference may be made to the related descriptions in the embodiments without being detailed in the description of the present embodiment, which is not described herein again.
Through a large number of tests, the technical scheme of the invention adopts a means of controlling the external electric operation (namely the electric operating mechanism) by the DSP, and controls the action of the external electric operation (namely the electric operating mechanism) by the control signal of the DSP on occasions inconvenient for manual operation, thereby solving the problem that the frequency converter needs manual switching-on after power failure and restart, and achieving the effect of improving the remote control capability of the frequency converter.
According to the embodiment of the present invention, there is also provided a method for controlling the start of a frequency converter of a magnetic levitation system, as shown in fig. 9, which is a schematic flow chart of an embodiment of the method of the present invention. The frequency converter comprises: electric operating machineThe circuit comprises a structure, a first switch module (such as an external relay K1), a rectifier module and a bus capacitor (such as a bus capacitor C)Bus bar) Discharge module (e.g. discharge resistor R)Discharge of electricity) And an inverter module. The electric operating mechanism includes: a charging module (such as an RS module formed by a charging resistor and a charging switch), a switching-off loop and a switching-on loop. An access terminal of the alternating current power supply is connected to the rectification module through the charging module, an output side of the rectification module is connected to the inversion module after being provided with a bus capacitor and a discharge resistor in parallel, and an output side of the inversion module is connected to the motor M. The starting control method of the frequency converter comprises the following steps: step S110 to step S140.
In step S110, through the sampling unit, under the condition that the bus capacitor is charged by the charging module in the electric operating mechanism after the frequency converter is powered on, that is, under the condition that the bus capacitor is charged by the current of the frequency converter through the charging module in the electric operating mechanism, the voltage on the bus at the bus capacitor on the output side of the rectifying module is sampled to obtain the electric bus voltage. The sampling unit may be a sampling resistor.
At step S120, a control signal is sent by the control module in case the bus voltage reaches a set voltage. The set voltage is a bus voltage value at which closing of a closing circuit in the electric operating mechanism is permitted. The control signal is used for controlling the first switch module to act. Specifically, after the frequency converter is powered on, the frequency converter firstly enters a charging loop, and the main control board is powered on at the moment (namely, the main control board is powered on the frequency converter). Furthermore, the main control board judges the bus voltage, and when the bus voltage reaches a state that the switch-on can be realized, a central processing unit (DSP) of the main control board sends a control signal to a control circuit of the electric operation (namely, an electric operation mechanism).
In step S130, the control signal is processed by the electrical operation control module in a self-starting mode of the frequency converter, and the action control signal of the first switch module is output, so as to close a closing circuit in the electrical operation mechanism. If the electric operating mechanism is controlled to be switched on, the control signal can control the action of external electric operation (namely the electric operating mechanism) to complete the function of self-starting when an incoming call is received.
At step S140, the first switch module operates based on the operation control signal in the self-starting mode of the frequency converter to control a closing circuit in the electric operating mechanism to be closed.
And the self-starting mode of the frequency converter is closed under the manual starting mode of the frequency converter through the electric operation control module, and a manual closing signal of a user is received, so that a closing circuit in the electric operating mechanism is closed. If the manual operation electric operation switch-on (namely the electric operation mechanism) is performed, the incoming call self-starting function is closed, and at the moment, the manual switch-on is required to complete the starting function of the frequency converter, namely, the power-on operation is manually completed.
The system comprises a sampling unit (such as a bus voltage sampling device) and a control unit (such as a main control panel). The control unit includes: a control module (such as a DSP in a main control board) and an electric operation control module.
Specifically, after the frequency converter is powered on, the DSP sends out a signal, and the signal is processed by a control circuit (namely an electric operation control circuit) of an electric operation (namely an electric operation mechanism) and controls an external device to act, so that the starting of the frequency converter is completed. After power-up is completed, the switch (e.g. contact S) in RS module of electric operation (i.e. electric operation mechanism)RContact SSContact ST) Closed, current passing through a switch (e.g., contact S) in an electrically operated (i.e., electrically operated mechanism) RS moduleRContact SSContact ST) The current flows to a rear circuit (such as a rectifier module) to charge the resistor R (such as the resistor R in the RS module)RResistance RSAnd a resistance RT) Short out of the circuit.
Therefore, through the control logic of the high-power frequency converter automatically started by the incoming call, a manual starting mode or an incoming call automatic starting mode can be selected according to the actual situation on site, the problem that the frequency converter needs to be manually powered on and switched on again due to power failure is solved for some special occasions inconvenient to be manually operated, the test problem caused by the problem that manual operation is needed for frequent power failure starting and stopping is solved in the test process, and the safety of power-on starting control of the frequency converter is improved.
Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the magnetic levitation system, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the embodiments, which are not repeated herein.
Through a large number of tests, the technical scheme of the embodiment is adopted, the starting mode after power-on can be manually selected according to actual conditions through the control logic after power-on of the frequency converter, and the problem that the two modes of manual switch-on power-on and incoming call self-starting can be switched at will is solved through the arrangement of the manual switch (such as the manual switch K), so that the two modes of manual switch-on power-on and incoming call self-starting can be switched at will, and the effect of the application occasion of the frequency converter is improved.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (13)

1. A start control device of a frequency converter, characterized in that the frequency converter comprises: the device comprises an electric operating mechanism, a first switch module, a rectifier module and a bus capacitor; the start control device of the frequency converter comprises: a sampling unit and a control unit; the control unit includes: the control module and the electric operation control module; wherein the content of the first and second substances,
the sampling unit is configured to sample the voltage on the bus at the bus capacitor on the output side of the rectifying module to obtain an electric bus voltage under the condition that the bus capacitor is charged through a charging module in the electric operating mechanism after the frequency converter is powered on;
the control module is configured to send a control signal when the bus voltage reaches a set voltage; the control signal is used for controlling the first switch module to act;
the electric operation control module is configured to process the control signal and output an action control signal of the first switch module so as to switch on a switch-on circuit in the electric operation mechanism in a self-starting mode of the frequency converter;
the first switch module is configured to act based on the action control signal in a self-starting mode of the frequency converter so as to control a closing circuit in the electric operating mechanism to be closed; the first switch module includes: a first relay; the contact of the first relay, comprising: the contact device comprises a first contact, a second contact and a third contact, wherein the first contact is a moving contact, and the second contact and the third contact are both static contacts; under the condition that the connection of a first contact and a second contact is switched to the connection of the first contact and a third contact in the contact connection state of the first relay, a closing circuit in the electric operating mechanism is conducted, a charging module of the electric operating mechanism stops charging the bus capacitor, the closing circuit in the electric operating mechanism is closed, and the frequency converter is started;
and under the manual starting mode of the frequency converter, closing the self-starting mode of the frequency converter, and receiving a manual closing signal of a user to close a closing circuit in the electric operating mechanism.
2. The apparatus for controlling starting of a frequency converter according to claim 1, wherein said electrically operated control module comprises: an electric operation control circuit; the electric operation control circuit comprises: a logic drive circuit and a drive control circuit; wherein the content of the first and second substances,
the logic driving circuit is configured to perform logic processing on the control signal to obtain a first processed signal;
the driving control circuit is configured to perform anti-interference processing on the first processing signal to obtain a second processing signal, which is used as an action control signal for controlling the action of the first switch module.
3. The apparatus for controlling starting of a frequency converter according to claim 2, wherein said logic driving circuit comprises: the device comprises a pull-up module, an input module and an inverting module; wherein the content of the first and second substances,
the drive control circuit performs interference rejection processing on the second processing signal, and includes:
the input module is configured to receive the control signal and input the control signal to the input end of the inverting module;
the pull-up module is configured to perform pull-up processing on the control signal received by the input module;
the inverting module is configured to perform inverting processing on the control signal input by the input module to obtain a first processed signal.
4. The apparatus for controlling starting of a frequency converter according to claim 3, wherein said logic driving circuit further comprises: a first filtering module;
the first filtering module is configured to filter the power supply of the phase inverting module.
5. The apparatus for controlling starting of a frequency converter according to claim 2, wherein said drive control circuit comprises: the voltage divider module, the switch tube, the current limiting module and the second switch module; wherein the content of the first and second substances,
the driving control circuit performs anti-interference processing on the first processing signal to obtain a second processing signal, and the driving control circuit includes:
the voltage division module is configured to perform voltage division processing on the first processing signal and then input the first processing signal to the switch tube;
the current limiting module is configured to limit the current of a power supply of the drive control circuit and then provide the current to the switching tube;
the second switch module is configured to be powered on and output a second processing signal when the switch tube is conducted.
6. The apparatus for controlling starting of a frequency converter according to claim 5, wherein said drive control circuit further comprises: a display module;
the display module is arranged between the current limiting module and the second switch module and is configured to display the state that the second switch module is powered on and outputs the second processing signal under the condition that the second switch module is powered on and outputs the second processing signal.
7. The apparatus for controlling starting of a frequency converter according to claim 5, wherein said drive control circuit further comprises: a freewheel circuit;
the free-wheeling circuit is configured to provide an energy release loop when the second switching module is powered off.
8. The apparatus for controlling starting of a frequency converter according to claim 5, wherein said drive control circuit further comprises: a second filtering module;
the second filtering module is configured to filter the first processing signal and then input the first processing signal to the switch tube through the voltage dividing module.
9. The apparatus for controlling the starting of the inverter according to any one of claims 5 to 8, wherein the second switching module comprises: a second relay; the contact of the second relay, comprising: a first contact and a second contact; the first contact is a movable contact and is connected with a power supply of the drive control circuit; the second contact is a static contact and is connected to the first switch module;
under the condition that the contact of the second relay is the first contact and the second contact, the electric operation control module further comprises: a mode selection switch; the mode selection switch is arranged between the second relay and the first switch module, and the starting mode of the frequency converter is a self-starting mode under the condition that the mode selection switch is closed; and under the condition that the mode selection switch is disconnected, the starting mode of the frequency converter is a manual starting mode.
10. The apparatus for controlling the starting of the inverter according to any one of claims 5 to 8, wherein the second switching module comprises: a third relay; the contact of the third relay comprising: a first contact, a second contact, and a third contact; the first contact is a movable contact and is connected with a power supply of the drive control circuit; the second contact and the third contact are both static contacts;
under the condition that the contacts of the third relay are a first contact, a second contact and a third contact, and under the condition that the starting mode of the frequency converter needs to be a self-starting mode, the second contact of the third relay is connected to the first switch module, and the second contact of the third relay is set to be a normally open contact; and under the condition that the starting mode of the frequency converter needs to be a manual starting mode, the third contact of the third relay is set to be a normally closed contact.
11. The apparatus for controlling the start-up of a frequency converter according to any one of claims 5 to 8, wherein the switching tube comprises: an NPN type triode or a PNP type triode;
under the condition that the switching tube is an NPN type triode, the base electrode of the NPN type triode is connected to the voltage division module, the collector electrode of the NPN type triode is connected to the current limiting module and the second switching module, and the emitting electrode of the NPN type triode is grounded;
under the condition that the switch tube is a PNP type triode, the base electrode of the PNP type triode is connected to the voltage division module, the emitting electrode of the PNP type triode is connected to the current limiting module and the second switch module, and the collecting electrode of the NPN type triode is grounded.
12. A magnetic levitation system, comprising: a start-up control device of a frequency converter according to any one of claims 1 to 11.
13. A method for controlling the start-up of a frequency converter in a magnetic levitation system as claimed in claim 12, wherein the frequency converter comprises: the device comprises an electric operating mechanism, a first switch module, a rectifier module and a bus capacitor; the starting control method of the frequency converter comprises the following steps:
through a sampling unit, under the condition that the bus capacitor is charged through a charging module in the electric operating mechanism after the frequency converter is powered on, sampling the voltage on the bus at the bus capacitor position on the output side of the rectifying module to obtain the voltage of the electric bus;
sending a control signal through a control module under the condition that the bus voltage reaches a set voltage; the control signal is used for controlling the first switch module to act;
processing the control signal through an electric operation control module in a self-starting mode of the frequency converter, and outputting an action control signal of the first switch module so as to switch on a switching-on circuit in the electric operation mechanism;
through a first switch module, under the self-starting mode of the frequency converter, the first switch module acts based on the action control signal to control a closing circuit in the electric operating mechanism to be closed;
and closing the self-starting mode of the frequency converter and receiving a manual closing signal of a user through the electric operation control module under the manual starting mode of the frequency converter so as to close a closing circuit in the electric operation mechanism.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101685975A (en) * 2008-09-27 2010-03-31 力博特公司 Method and device of soft start of bus voltage in uninterruptible power supply
CN102412717A (en) * 2011-11-18 2012-04-11 广州三晶电气有限公司 Lossless soft start device and method for frequency converter
CN203151367U (en) * 2013-01-21 2013-08-21 浙江德玛电气有限公司 Powering-on buffer device of energy feedback converter
CN208299427U (en) * 2018-06-13 2018-12-28 深圳市易优电气有限公司 Overvoltage crowbar and over-pressure safety device
CN111817544A (en) * 2020-08-14 2020-10-23 珠海格力电器股份有限公司 Frequency converter starting device and method and frequency converter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102820771B (en) * 2012-08-10 2015-10-21 深圳市禾望电气股份有限公司 A kind of converter equipment soft starting device and soft-start method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101685975A (en) * 2008-09-27 2010-03-31 力博特公司 Method and device of soft start of bus voltage in uninterruptible power supply
CN102412717A (en) * 2011-11-18 2012-04-11 广州三晶电气有限公司 Lossless soft start device and method for frequency converter
CN203151367U (en) * 2013-01-21 2013-08-21 浙江德玛电气有限公司 Powering-on buffer device of energy feedback converter
CN208299427U (en) * 2018-06-13 2018-12-28 深圳市易优电气有限公司 Overvoltage crowbar and over-pressure safety device
CN111817544A (en) * 2020-08-14 2020-10-23 珠海格力电器股份有限公司 Frequency converter starting device and method and frequency converter

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