CN116317615A - Frequency converter with STO function and star sealing function - Google Patents
Frequency converter with STO function and star sealing function Download PDFInfo
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- CN116317615A CN116317615A CN202310036346.6A CN202310036346A CN116317615A CN 116317615 A CN116317615 A CN 116317615A CN 202310036346 A CN202310036346 A CN 202310036346A CN 116317615 A CN116317615 A CN 116317615A
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention provides a frequency converter with a STO function and a star sealing function, which comprises an EMC unit, an AC-DC unit, a three-phase inversion unit, a STO function module, a star sealing function module, a current detection unit, a bus voltage detection unit, a DSP single-chip microcomputer unit, an elevator control main board and a STO control signal unit. The frequency converter with the STO function and the star sealing function can realize the STO function and the star sealing function simultaneously, realize electronic interlocking between the STO function and the star sealing function, inhibit star sealing when the frequency converter outputs, inhibit the frequency converter from outputting torque when the star is sealed, ensure that the output of the frequency converter cannot be shorted, and ensure that the star can be sealed normally.
Description
Technical Field
The invention relates to the technical field of elevator frequency converters, in particular to a frequency converter with a STO function and a star sealing function.
Background
The STO function of the elevator means: the output torque of the frequency converter is realized under the combined action of the PWM control signal and the driving power supply, when the driving power supply is turned off, the STO function is activated, and the frequency converter stops outputting the torque.
The star sealing function of the elevator means: when the frequency converter stops outputting the torque and the elevator stops, the star sealing contactor shorts three windings of the motor, which is equivalent to shorting the output end of the frequency converter.
The current common star sealing method is to short-circuit three windings of a motor through a star sealing contactor, but in order to ensure the safe operation of a frequency converter, an electrical interlock is used between the star sealing contactor and an operation contactor. When the STO function is used by the frequency converter, the running contactor is not used any more, and the problem of how to realize the interlocking between the STO function and the star sealer is solved.
Disclosure of Invention
The invention mainly solves the technical problem of providing a frequency converter with a STO function and a star sealing function, and is characterized in that the frequency converter can realize the STO function and the star sealing function simultaneously, and electronic interlocking is realized between the STO function and the star sealing function, when the frequency converter outputs, the star sealing is forbidden, and when the star is sealed, the frequency converter outputs torque is forbidden, so that the frequency converter output is not shorted, and the motor can normally seal the star.
In order to solve the technical problems, the first technical scheme adopted by the invention is to provide a frequency converter with STO function and star sealing function, which comprises an EMC unit 10, an AC-DC unit 11, a three-phase inversion unit 12, a STO function module 40, a star sealing function module 50, a current detection unit 13, a bus voltage detection unit 15, a DSP singlechip unit 17, an elevator control main board 30 and a STO control signal unit 31;
the output end of the EMC unit 10 is connected with the AC-DC conversion unit 11, the output end of the AC-DC conversion unit 11 is connected with the three-phase inversion unit 12, the output end of the three-phase inversion unit 12 is connected with the current detection unit 13, and the output end of the current detection unit 13 is connected with the three-phase motor 32; the STO functional module 40 is connected between the three-phase inversion unit 12 and the DSP singlechip unit 17, and the STO functional module 40 is connected with the elevator control main board 30 and the STO control signal unit 31; the star sealing function module 50 is connected with the STO function module 40, and when the elevator control main board 30 enables the main switch of the star sealing function module 50 to be closed, three windings of the three-phase motor 32 are short-circuited through the star sealing function module 50; when the elevator control main board 30 turns off the main switch of the star seal function module 50 and the STO control signal unit 31 turns on the PWM drive power supply unit 26, the STO function module 40 supplies the PWM drive power supply to drive the three-phase motor 32 to output torque.
In one embodiment, further comprises a PG card 33 and an encoder 34; the PG card 33 and the encoder 34 are electrically connected, and the PG card 33 is electrically connected to a drive board of the three-phase motor 32.
In an embodiment, the electronic device further comprises an input voltage detection unit 14, a temperature sensor 16 and a fan heat dissipation driving unit 20 which are electrically connected with the DSP single chip unit 17.
In one embodiment, the STO functional module 40 includes a three-phase inversion upper bridge driving unit 18, a three-phase inversion lower bridge driving unit 19, a STO control unit 21, a STO feedback signal output terminal 22, and a PWM driving power supply unit 26;
the three-phase inversion upper bridge driving unit 18 is connected with the three-phase inversion unit 12, the DSP singlechip unit 17 and the PWM driving power supply unit 26, the PWM driving power supply unit 26 is connected with the star sealing function module 50 and the STO control unit 21, the control signals of the STO control signal unit 31 are output to the STO control unit 21 and the PWM driving power supply unit 26, and the feedback signals of the PWM driving power supply unit 26 and the STO control unit 21 are output to the elevator control main board 30;
the STO control unit 21 provides +5V driving voltage for the star sealing function module 50, and when the elevator control main board 30 controls the star sealing function module 50 to be closed, the PWM driving power supply unit 26 can provide driving power for the three-phase inversion upper bridge driving unit 18 and the three-phase inversion lower bridge driving unit 19 to drive the three-phase motor 32 to output torque; otherwise, the PWM driving power unit 26 cannot provide driving power for the three-phase inversion upper bridge driving unit 18 and the three-phase inversion lower bridge driving unit 19, so as to drive the three-phase motor 32 to stop outputting torque, and the three windings of the three-phase motor 32 are shorted through the star sealing function module 50.
In one embodiment, the star seal function module 50 includes a first star seal contactor/star seal relay 23, a second star seal contactor/star seal relay 24, and a star seal drive unit 25;
the first star-sealing contactor/star-sealing relay 23 comprises a third switch contact, a fourth switch contact, a sixth switch contact, a seventh switch contact and a first winding group K1;
the second star-sealed contactor/star-sealed relay 24 comprises a third switch contact, a fourth switch contact, a sixth switch contact, a seventh switch contact and a second winding group K2;
the +5V direct current output end of the STO control unit 21 is connected with a fourth switch contact of a second star-sealing contactor/star-sealing relay 24, a third switch contact of the second star-sealing contactor/star-sealing relay 24 is connected with a fourth switch contact of a first star-sealing contactor/star-sealing relay 23, a third switch contact of the second star-sealing contactor/star-sealing relay 24 is connected with the first star-sealing contactor/star-sealing relay 23 and comprises a fourth switch contact, and a third switch contact of the first star-sealing contactor/star-sealing relay 23 is connected with a PWM driving power supply unit 26; one end of the star-sealing driving unit 25 is connected with an output control signal of the elevator control main board 30, and the other end is connected with two wire winding ends of the first wire winding group K1 and the second wire winding group K2;
in the process that the elevator control main board 30 controls the three-phase motor 32 to output torque, the third switch contact and the fourth switch contact of the first star-sealing contactor/star-sealing relay 23 are connected, the third switch contact and the fourth switch contact of the second star-sealing contactor/star-sealing relay 24 are connected, the sixth switch contact and the seventh switch contact of the first star-sealing contactor/star-sealing relay 23 are disconnected, the sixth switch contact and the seventh switch contact of the second star-sealing contactor/star-sealing relay 24 are disconnected, and the three-phase motor 32 outputs torque;
in the process of activating the STO function module 40 by the STO control signal unit 31, the third switch contact and the fourth switch contact of the first star-closing contactor/star-closing relay 23 are disconnected, the third switch contact and the fourth switch contact of the second star-closing contactor/star-closing relay 24 are disconnected, and the PWM driving power supply unit 26 does not output a driving signal; the sixth and seventh switch contacts of the first star-close contactor/star-close relay 23 are closed, the sixth and seventh switch contacts of the second star-close contactor/star-close relay 24 are closed, and the three-phase motor 32 stops outputting torque.
The beneficial effects of the invention are as follows: the auxiliary contact switch of the star sealing contactor/star sealing relay is connected to the driving power supply of the PWM signal in series, the driving power supply of the PWM signal is disconnected when the star is sealed, the STO function of the frequency converter is activated, the output of the frequency converter is forbidden, and meanwhile, the star sealing contactor/star sealing relay feeds back a signal to the elevator control main board through the auxiliary contact switch, so that the main board can not output the star sealing control signal when the frequency converter outputs.
Drawings
Fig. 1 is a schematic circuit diagram of a frequency converter with a STO function and a star-sealing function according to the present invention.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the drawings.
The frequency converter with STO function and star sealing function shown in FIG. 1 comprises an EMC unit 10, an AC-DC conversion unit 11, a three-phase inversion unit 12, a STO function module 40, a star sealing function module 50, a current detection unit 13, a bus voltage detection unit 15, a DSP single chip microcomputer unit 17, an elevator control main board 30 and a STO control signal unit 31;
the output end of the EMC unit 10 is connected with the AC-DC conversion unit 11, the output end of the AC-DC conversion unit 11 is connected with the three-phase inversion unit 12, the output end of the three-phase inversion unit 12 is connected with the current detection unit 13, and the output end of the current detection unit 13 is connected with the three-phase motor 32; the STO functional module 40 is connected between the three-phase inversion unit 12 and the DSP singlechip unit 17, and the STO functional module 40 is connected with the elevator control main board 30 and the STO control signal unit 31; the star sealing function module 50 is connected with the STO function module 40, and when the elevator control main board 30 enables the main switch of the star sealing function module 50 to be closed, three windings of the three-phase motor 32 are short-circuited through the star sealing function module 50; when the elevator control main board 30 turns off the main switch of the star seal function module 50 and the STO control signal unit 31 turns on the PWM drive power supply unit 26, the STO function module 40 supplies the PWM drive power supply to drive the three-phase motor 32 to output torque.
Obviously, in this embodiment, the STO function and the star sealing function can be realized simultaneously, and the electronic interlocking is realized between the STO function and the star sealing function, the star sealing is forbidden when the frequency converter outputs, the frequency converter outputs torque when the star is sealed, the frequency converter output is not only ensured to be not shorted, but also the three-phase motor can be ensured to normally seal the star.
In one embodiment, as shown in fig. 1, the frequency converter with the STO function and the star sealing function of the present invention further includes a PG card 33 and an encoder 34; the PG card 33 is electrically connected with the encoder 34, and the PG card 33 is electrically connected with a driving board of the three-phase motor 32; further, the frequency converter with STO function and star sealing function comprises an input voltage detection unit 14, a temperature sensor 16 and a fan heat dissipation driving unit 20 which are electrically connected with the DSP singlechip unit 17.
As shown in fig. 1, in detail, the STO function block 40 includes a three-phase inversion upper bridge driving unit 18, a three-phase inversion lower bridge driving unit 19, a STO control unit 21, a STO feedback signal output terminal 22, a PWM driving power supply unit 26;
the three-phase inversion upper bridge driving unit 18 is connected with the three-phase inversion unit 12, the DSP singlechip unit 17 and the PWM driving power supply unit 26, the PWM driving power supply unit 26 is connected with the star sealing function module 50 and the STO control unit 21, the control signals of the STO control signal unit 31 are output to the STO control unit 21 and the PWM driving power supply unit 26, and the feedback signals of the PWM driving power supply unit 26 and the STO control unit 21 are output to the elevator control main board 30;
the STO control unit 21 provides +5V driving voltage for the star sealing function module 50, and when the elevator control main board 30 controls the star sealing function module 50 to be closed, the PWM driving power supply unit 26 can provide driving power for the three-phase inversion upper bridge driving unit 18 and the three-phase inversion lower bridge driving unit 19 to drive the three-phase motor 32 to output torque; otherwise, the PWM driving power unit 26 cannot provide driving power for the three-phase inversion upper bridge driving unit 18 and the three-phase inversion lower bridge driving unit 19, so as to drive the three-phase motor 32 to stop outputting torque, and the three windings of the three-phase motor 32 are shorted through the star sealing function module 50. In this design, the output torque of the three-phase motor 32 is realized under the combined action of the three-phase inversion upper bridge driving unit 18, the three-phase inversion lower bridge driving unit 19 and the PWM driving power unit 26, when the STO control unit 21 turns off the PWM driving power unit 26, the three-phase inversion upper bridge driving unit 18 and the three-phase inversion lower bridge driving unit 19 lose driving signals, the three-phase inversion unit 12 cannot be driven to perform inversion output, and the three-phase motor 32 stops outputting the torque.
As further shown in fig. 1, the star seal function module 50 includes a first star seal contactor/star seal relay 23, a second star seal contactor/star seal relay 24, and a star seal drive unit 25;
the first star-sealing contactor/star-sealing relay 23 comprises a third switch contact, a fourth switch contact, a sixth switch contact, a seventh switch contact and a first winding group K1;
the second star-sealed contactor/star-sealed relay 24 comprises a third switch contact, a fourth switch contact, a sixth switch contact, a seventh switch contact and a second winding group K2;
the +5V direct current output end of the STO control unit 21 is connected with a fourth switch contact of a second star-sealing contactor/star-sealing relay 24, a third switch contact of the second star-sealing contactor/star-sealing relay 24 is connected with a fourth switch contact of a first star-sealing contactor/star-sealing relay 23, a third switch contact of the second star-sealing contactor/star-sealing relay 24 is connected with the first star-sealing contactor/star-sealing relay 23 and comprises a fourth switch contact, and a third switch contact of the first star-sealing contactor/star-sealing relay 23 is connected with a PWM driving power supply unit 26; one end of the star-sealing driving unit 25 is connected with an output control signal of the elevator control main board 30, and the other end is connected with two wire winding ends of the first wire winding group K1 and the second wire winding group K2;
in the process that the elevator control main board 30 controls the three-phase motor 32 to output torque, the third switch contact and the fourth switch contact of the first star-sealing contactor/star-sealing relay 23 are connected, the third switch contact and the fourth switch contact of the second star-sealing contactor/star-sealing relay 24 are connected, the sixth switch contact and the seventh switch contact of the first star-sealing contactor/star-sealing relay 23 are disconnected, the sixth switch contact and the seventh switch contact of the second star-sealing contactor/star-sealing relay 24 are disconnected, and the three-phase motor 32 outputs torque;
in the process of activating the STO function module 40 by the STO control signal unit 31, the third switch contact and the fourth switch contact of the first star-closing contactor/star-closing relay 23 are disconnected, the third switch contact and the fourth switch contact of the second star-closing contactor/star-closing relay 24 are disconnected, and the PWM driving power supply unit 26 does not output a driving signal; the sixth and seventh switch contacts of the first star-close contactor/star-close relay 23 are closed, the sixth and seventh switch contacts of the second star-close contactor/star-close relay 24 are closed, and the three-phase motor 32 stops outputting torque.
For the preferred embodiment shown in fig. 1, the PWM driving power supply unit 26 is a +5v dc power from the STO control unit 21, the +5v dc power is controlled by the two STO control signal units 31 and then output from the STO control unit 21 to the three-phase inversion upper bridge driving unit 18 and the three-phase inversion lower bridge driving unit 19 through two series star contactors/star relays, and the three-phase motor 32 is allowed to output torque. On the contrary, if the STO function is activated by the STO control signal unit 31 or the star closing function module 50 is in the star closing state, the PWM driving power supply unit 26 is turned off and the three-phase motor 32 is prohibited from outputting torque. The STO control signal outputted from the STO control signal unit 31 is outputted from an elevator safety circuit, and the safety circuit is connected to a signal input. The STO control unit 21 outputs 2 feedback signals to the elevator control main board 30 while controlling the PWM driving power unit 26, so that the elevator control main board 30 monitors the state of the STO control unit 21 at any time.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures made by the description of the invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the invention.
Claims (5)
1. The frequency converter with the STO function and the star sealing function is characterized by comprising an EMC unit (10), an AC-DC conversion unit (11), a three-phase inversion unit (12), a STO function module (40), a star sealing function module (50), a current detection unit (13), a bus voltage detection unit (15), a DSP single chip microcomputer unit (17), an elevator control main board (30) and a STO control signal unit (31);
the output end of the EMC unit (10) is connected with the AC-DC conversion unit (11), the output end of the AC-DC conversion unit (11) is connected with the three-phase inversion unit (12), the output end of the three-phase inversion unit (12) is connected with the current detection unit (13), and the output end of the current detection unit (13) is connected with the three-phase motor (32); the STO functional module (40) is connected between the three-phase inversion unit (12) and the DSP singlechip unit (17), and the STO functional module (40) is connected with the elevator control main board (30) and the STO control signal unit (31); the star sealing function module (50) is connected with the STO function module (40), and when the elevator control main board (30) enables the main switch of the star sealing function module (50) to be closed, three windings of the three-phase motor (32) are short-circuited through the star sealing function module (50); when the elevator control main board (30) enables the main switch of the star sealing function module (50) to be disconnected and the STO control signal unit (31) enables the PWM driving power supply unit (26) to be closed, the STO function module (40) provides PWM driving power to drive the three-phase motor (32) to output torque.
2. The frequency converter with STO function and star seal function according to claim 1, characterized in that it further comprises a PG card (33) and an encoder (34); the PG card (33) is electrically connected with the encoder (34), and the PG card (33) is electrically connected with a driving board of the three-phase motor (32).
3. The frequency converter with the STO function and the star-sealing function according to claim 2, further comprising an input voltage detection unit (14), a temperature sensor (16) and a fan heat dissipation driving unit (20) which are electrically connected with the DSP single chip microcomputer unit (17).
4. A frequency converter with a STO function and a star closing function according to claim 3, characterized in that the STO function module (40) comprises a three-phase inversion upper bridge driving unit (18), a three-phase inversion lower bridge driving unit (19), a STO control unit (21), a STO feedback signal output terminal (22), a PWM driving power supply unit (26);
the three-phase inversion upper bridge driving unit (18) is connected with the three-phase inversion unit (12), the DSP singlechip unit (17) and the PWM driving power supply unit (26), the PWM driving power supply unit (26) is connected with the star sealing function module (50) and the STO control unit (21), the control signal of the STO control signal unit (31) is output to the STO control unit (21) and the PWM driving power supply unit (26), and the feedback signals of the PWM driving power supply unit (26) and the STO control unit (21) are output to the elevator control main board (30);
the STO control unit (21) provides +5V driving voltage for the star sealing function module (50), and when the elevator control main board (30) controls the star sealing function module (50) to be closed, the PWM driving power supply unit (26) can provide driving power for the three-phase inversion upper bridge driving unit (18) and the three-phase inversion lower bridge driving unit (19) to drive the three-phase motor (32) to output torque; otherwise, the PWM driving power supply unit (26) cannot provide driving power for the three-phase inversion upper bridge driving unit (18) and the three-phase inversion lower bridge driving unit (19), the three-phase motor (32) is driven to stop outputting torque, and three windings of the three-phase motor (32) are short-circuited through the star sealing function module (50).
5. A frequency converter with STO and star sealing function according to claim 4, characterized in that the star sealing function module (50) comprises a first star sealing contactor/star sealing relay (23), a second star sealing contactor/star sealing relay (24) and a star sealing drive unit (25);
the first star-sealing contactor/star-sealing relay (23) comprises a third switch contact, a fourth switch contact, a sixth switch contact, a seventh switch contact and a first winding group (K1);
the second star-sealing contactor/star-sealing relay (24) comprises a third switch contact, a fourth switch contact, a sixth switch contact, a seventh switch contact and a second winding group (K2);
the +5V direct current output end of the STO control unit (21) is connected with a fourth switch contact of a second star-sealing contactor/star-sealing relay (24), a third switch contact of the second star-sealing contactor/star-sealing relay (24) is connected with a fourth switch contact of a first star-sealing contactor/star-sealing relay (23), the third switch contact of the second star-sealing contactor/star-sealing relay (24) is connected with the first star-sealing contactor/star-sealing relay (23) and comprises a fourth switch contact, and the third switch contact of the first star-sealing contactor/star-sealing relay (23) is connected with a PWM driving power supply unit (26); one end of the star sealing driving unit (25) is connected with an output control signal of the elevator control main board (30), and the other end is connected with two wire winding ends of the first wire winding group (K1) and the second wire winding group (K2);
in the process of controlling the three-phase motor (32) to output torque by the elevator control main board (30), a third switch contact of the first star-sealing contactor/star-sealing relay (23) is connected with a fourth switch contact, a third switch contact of the second star-sealing contactor/star-sealing relay (24) is connected with the fourth switch contact, a sixth switch contact of the first star-sealing contactor/star-sealing relay (23) is disconnected with a seventh switch contact, a sixth switch contact of the second star-sealing contactor/star-sealing relay (24) is disconnected with the seventh switch contact, and the three-phase motor (32) outputs torque;
in the process of activating the STO functional module (40) by the STO control signal unit (31), the third switch contact and the fourth switch contact of the first star-closing contactor/star-closing relay (23) are disconnected, the third switch contact and the fourth switch contact of the second star-closing contactor/star-closing relay (24) are disconnected, and the PWM driving power supply unit (26) outputs no driving signal; the sixth and seventh switch contacts of the first star-closing contactor/star-closing relay (23) are closed, the sixth and seventh switch contacts of the second star-closing contactor/star-closing relay (24) are closed, and the three-phase motor (32) stops outputting torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310036346.6A CN116317615A (en) | 2023-01-09 | 2023-01-09 | Frequency converter with STO function and star sealing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310036346.6A CN116317615A (en) | 2023-01-09 | 2023-01-09 | Frequency converter with STO function and star sealing function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116317615A true CN116317615A (en) | 2023-06-23 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310036346.6A Pending CN116317615A (en) | 2023-01-09 | 2023-01-09 | Frequency converter with STO function and star sealing function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116317615A (en) |
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2023
- 2023-01-09 CN CN202310036346.6A patent/CN116317615A/en active Pending
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