CN113541505A - Brake power supply for construction elevator and control method - Google Patents
Brake power supply for construction elevator and control method Download PDFInfo
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- CN113541505A CN113541505A CN202110626798.0A CN202110626798A CN113541505A CN 113541505 A CN113541505 A CN 113541505A CN 202110626798 A CN202110626798 A CN 202110626798A CN 113541505 A CN113541505 A CN 113541505A
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- power supply
- switch
- igbt switch
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- igbt
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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
- H02M5/4585—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 having a rectifier with controlled elements
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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
- H02P27/085—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 wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Elevator Control (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a brake power supply for a construction elevator and a control method, wherein the brake power supply comprises a 380V power supply, a switch S1, a switch S2, a rectifier module, an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4 and a diode, the 380V power supply is connected with the input end of the rectifier module through the switch S1 and the switch S2, the output end + of the rectifier module is connected with the drain electrode of the IGBT switch Q1, and the source electrode of the IGBT switch Q1 is connected with the drain electrode of the diode and the drain electrode of the IGBT switch Q3; secondly, the independent chip is used for controlling and protecting the brake power supply, so that the stability and the safety of brake control are improved. Particularly, in the aspect of software control, a more accurate closed-loop control mode is adopted to realize stable and reliable direct-current output voltage.
Description
Technical Field
The invention relates to the technical field of power supply control, in particular to a brake power supply for a construction elevator and a control method.
Background
At present, the construction elevator for building is driven by adopting an asynchronous motor, and a speed reducer and a brake are arranged at the upper rear end of a mechanical mechanism of the asynchronous motor. The brake control of the construction elevator is particularly critical, and if the brake at the tail end of the motor is in a problem, if the brake torque is insufficient, the construction elevator can slide down and slide. The driving integrated machine of the construction elevator needs a switch for reasonably controlling the brake, thereby realizing the stability and safety of the operation of the construction elevator. Generally, a brake at the tail end of a motor for a construction elevator is switched on and off by a mode of switching on and off a direct current power supply, an input power supply in a driver of the construction elevator is generally a three-phase 380V input type, a traditional brake power supply adopts a transformer mode to reduce voltage, and then the direct current power supply is output through uncontrolled rectification.
Disclosure of Invention
The invention aims to provide a brake power supply for a construction elevator and a control method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a brake power supply for a construction elevator comprises a 380V power supply, a switch S1, a switch S2, a rectifier module, an IGBT switch Q1 and an IGBT switch Q2, the 380V power supply is connected with the input end of a rectification module through a switch S1 and a switch S2, the output end + of the rectification module is connected with the drain electrode of an IGBT switch Q1, the source electrode of the IGBT switch Q1 is connected with the cathode electrode of a diode D and the drain electrode of the IGBT switch Q3, the source electrode of the IGBT switch Q3 is connected with a motor brake module, the output end + of the rectification module is connected with the source electrode of an IGBT switch Q2, the drain electrode of the IGBT switch Q2 is connected with the anode electrode of the diode D and the source electrode of the IGBT switch Q4, the drain electrode of the IGBT switch Q4 is connected with the other end of the motor brake module, the grid electrodes of the IGBT switch Q1, the IGBT switch Q2, the IGBT switch Q3 and the IGBT switch Q4 are all connected with a controller, the output voltage of the 380V power supply is Urs, and the source electrode voltage of the IGBT switch Q3 is Udc.
As a further technical scheme of the invention: the switch S1 and the switch S2 are relay switches.
As a further technical scheme of the invention: the rectification module is a single-phase uncontrolled rectifier bridge consisting of four rectifier diodes.
As a further technical scheme of the invention: the diode D is a reverse freewheeling diode.
As a further technical scheme of the invention: the controller comprises a phase-locked loop, a PI controller, a filter LPF and a PWM module, wherein the input end of the phase-locked loop is connected with a voltage Urs to obtain the phase theta of the power gridgridAfter the Udc passes through the low-pass filter LPF, the voltage is compared with a given voltage UdcRef and enters a PI controller, and the result of PI output generates a corresponding PWM wave and a phase thetagridTogether pass through the signal generatorThe forming module X outputs a PWM control signal.
As a further technical scheme of the invention: the phase-locked loop comprises a second-order generalized integrator SOGI and a software phase-locked loop SPLL.
A brake power supply control method for a construction elevator is characterized in that the power supply is adopted, RS line voltage Urs in a three-phase input power supply is collected and sent into a phase-locked loop, phase locking is achieved in a mode of combining a second-order generalized integrator SOGI and a software phase-locked loop SPLL, and the phase theta of a power grid is obtainedgridAfter the collected feedback Udc is low-pass filtered LPF, the collected feedback Udc is compared with given voltage UdcRef and then enters a PI controller, the result output by the PI controller generates corresponding PWM wave, after the Udc passes through the low-pass filtered LPF, the result output by the PI controller is compared with the given voltage UdcRef and then enters the PI controller, and the result output by the PI controller generates corresponding PWM wave and phase thetagridAnd the PWM control signal is output through the signal generating module X, and the IGBT switches Q1-Q4 are controlled, so that the stable 200V direct-current voltage output is realized.
Compared with the prior art, the invention has the beneficial effects that:
1. the cost of brake scheme design is optimized, and the brake power supply is lighter and more miniaturized. The transformer type voltage reduction device is more beneficial to engineering realization and product installation, and most of the original design in the industry adopts a transformer mode to reduce voltage, and a power electronic controllable rectification voltage reduction scheme is innovatively adopted;
2. the reliability of brake control is improved, the brake power supply, the brake control circuit and the service life of the motor brake are prolonged, the design scheme control method adopts a closed-loop controllable mode to output power supply, is different from the traditional mode of uncontrolled rectification and is limited by the change of the voltage of a front-end power grid;
3. the safety of brake control is enhanced, an independent chip is adopted for software design of a brake control part, multi-directional information is collected for software function safety consideration, information of an input end and an output end is monitored, and both the input end and the output end can be effectively protected in time regardless of abnormity of the input end and the output end;
4. the brake control rapidity is improved, the switch of the conventional brake control switch is realized by controlling the on-off of the relay, and the mechanical delay of the relay is far longer than the on-off time of the IGBT, so that the brake control rapidity is greatly improved.
Drawings
Fig. 1 is a topological structure diagram of a brake power supply of a construction elevator.
Fig. 2 is a frame diagram of a construction elevator brake power supply control.
FIG. 3 is a schematic diagram of a single-phase software phase-locked loop of a brake power supply.
FIG. 4 is a flow chart of the brake power control software for the construction hoist.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1: referring to fig. 1, a brake power supply for a construction elevator comprises a 380V power supply, a switch S1, a switch S2, a rectifier module, an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4 and a diode D, wherein the 380V power supply is connected with the input end of the rectifier module through a switch S1 and a switch S2, the output end + of the rectifier module is connected with the drain of the IGBT switch Q1, the source of the IGBT switch Q1 is connected with the cathode of the diode D and the drain of the IGBT switch Q3, the source of the IGBT switch Q3 is connected with a motor brake module, the output end-of the rectifier module is connected with the source of the IGBT switch Q2, the drain of the IGBT switch Q2 is connected with the anode of the diode D and the source of the IGBT switch Q4, the drain of the IGBT switch Q4 is connected with the other end of the motor brake module, the gates of the IGBT switch Q1, the IGBT switch Q2, the IGBT switch Q3 and the Q4 are connected with a controller, and the output voltage of the 380V power supply is Urs, the source voltage of the IGBT switch Q3 is Udc.
Wherein, S1 and S2 are relay switches, 4 diodes are single-phase uncontrolled rectifier bridges, Q1 and Q2 are positive and negative direction control wave-generating IGBT tubes, respectively, In and Ip collected at the next stage are positive and negative direction output currents, respectively, Q3 and Q4 are positive and negative direction control output turn-on switch IGBTs, respectively, and Udc is collected output direct current voltage. The scheme without the transformer is a hardware precondition for realizing controllable rectification and voltage reduction.
The invention also discloses a brake power supply control method for the construction elevator, which adopts the power supply to collect RS line voltage Urs in the three-phase input power supply and send the RS line voltage Urs into the phase-locked loop, realizes phase locking by adopting a mode of combining a second-order generalized integrator SOGI and a software phase-locked loop SPLL, and obtains the phase theta of the power gridgridAfter the collected feedback Udc is low-pass filtered LPF, the collected feedback Udc is compared with given voltage UdcRef and then enters a PI controller, the result output by the PI controller generates corresponding PWM wave, after the Udc passes through the low-pass filtered LPF, the result output by the PI controller is compared with the given voltage UdcRef and then enters the PI controller, and the result output by the PI controller generates corresponding PWM wave and phase thetagridAnd the PWM control signal is output through the signal generating module X, and the IGBT switches Q1-Q4 are controlled, so that the stable 200V direct-current voltage output is realized.
As shown in fig. 4, the specific operation mode is firstly power-on initialization, operations such as initial value assignment of data calculation, power-on short-circuit detection to ground, power grid abnormal detection and the like are performed, and after the operation detection is normal, the shutdown state is skipped. The software starts data acquisition and other works in a shutdown state, jumps to a standby state after judging that no abnormity exists in data acquisition, starts to judge whether a software phase-locked loop is successfully phase-locked in the standby state, allows the jump operation state to start wave generation to establish output voltage after the software phase-locked loop is successfully phase-locked, and can interact information with another upper computer control chip to determine whether to output the on-off of Q3 and Q4 so as to enable a brake action switch. Under-voltage, over-current and other fault detection is carried out in the running state and the standby state, whether the machine is stopped or not is selected according to the fault design condition, and the wave generation and output turn-off control IGBT is turned off in the stopped state, so that the brake power supply is timely and effectively guaranteed to be turned off.
Example 3, as shown in FIG. 3, is a process of software phase locking, where in SOGI, k is the adjustment scaling factor, ω0For the resonant frequency of the SOGI, quadrature voltage components u can be obtained after integrationα，uβThe method is used for controlling a next-stage software phase-locked loop, obtains direct-current component voltages Ud and Uq after Park conversion, and controls the q-axis voltage to be 0 by utilizing the idea of software phase locking, wherein omega is in the figureeFor the frequency of the power grid voltage, the convergence process of the phase-locked loop can be accelerated, generally, the phase-locked loop needs to be converted into a transfer function of a continuous domain as shown in a formula 1, and then the phase-locked loop can be discretized by a bilinear transformation method.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A brake power supply for a construction elevator comprises a 380V power supply, a switch S1, a switch S2, a rectifier module, an IGBT switch Q1, an IGBT switch Q2, an IGBT switch Q3, an IGBT switch Q4 and a diode D, and is characterized in that the 380V power supply is connected with the input end of the rectifier module through a switch S1 and a switch S2, the output end + of the rectifier module is connected with the drain electrode of the IGBT switch Q1, the source electrode of the IGBT switch Q1 is connected with the cathode of the diode D and the drain electrode of the IGBT switch Q3, the source electrode of the IGBT switch Q3 is connected with a motor brake module, the output end-the rectifier module is connected with the source electrode of the IGBT switch Q2, the drain electrode of the IGBT switch Q2 is connected with the anode of the diode D and the source electrode of the IGBT switch Q4, the drain electrode of the IGBT switch Q4 is connected with the other end of the motor brake module, the gates of the IGBT switch Q1, the IGBT switch Q2, the IGBT switch Q3 and the Q4 are connected with a controller, and the output voltage of the 380V power supply is Urs, the source voltage of the IGBT switch Q3 is Udc.
2. The brake power supply for construction hoist of claim 1, wherein the switches S1 and S2 are relay switches.
3. The brake power supply for the construction elevator as claimed in claim 1, wherein the rectification module is a single-phase uncontrolled rectifier bridge consisting of four rectifier diodes.
4. The brake power supply for a construction elevator according to claim 1, wherein the diode D is a reverse freewheeling diode.
5. The braking power supply for construction elevator as claimed in claim 1, wherein the braking power supply comprises a power supply unitThe controller comprises a phase-locked loop, a PI controller, a filter LPF and a PWM module, wherein the input end of the phase-locked loop is connected with a voltage Urs to obtain the phase theta of the power gridgridAfter the Udc passes through the low-pass filter LPF, the voltage is compared with a given voltage UdcRef and enters a PI controller, and the result of PI output generates a corresponding PWM wave and a phase thetagridAnd outputs PWM control signals together through the signal generating module X.
6. The brake power supply for construction elevator as claimed in claim 1, wherein the phase locked loop comprises a second order generalized integrator SOGI and a software phase locked loop SPLL.
7. A brake power supply control method for a construction elevator is characterized in that the power supply of any one of claims 1-6 is adopted, RS line voltage Urs in a three-phase input power supply is collected and sent to a phase-locked loop, phase locking is realized by adopting a mode of combining a second-order generalized integrator SOGI and a software phase-locked loop SPLL, and the phase theta of a power grid is obtainedgridAfter the collected feedback Udc is low-pass filtered LPF, the collected feedback Udc is compared with given voltage UdcRef and then enters a PI controller, the result output by the PI controller generates corresponding PWM wave, after the Udc passes through the low-pass filtered LPF, the result output by the PI controller is compared with the given voltage UdcRef and then enters the PI controller, and the result output by the PI controller generates corresponding PWM wave and phase thetagridAnd the PWM control signal is output through the signal generating module X, and the IGBT switches Q1-Q4 are controlled, so that the stable 200V direct-current voltage output is realized.
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| CN202110626798.0A CN113541505B (en) | 2021-06-04 | 2021-06-04 | Brake power supply for construction elevator and control method |
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| CN202110626798.0A CN113541505B (en) | 2021-06-04 | 2021-06-04 | Brake power supply for construction elevator and control method |
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| CN113541505B CN113541505B (en) | 2023-04-07 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588132A (en) * | 2007-11-28 | 2009-11-25 | 北京博旺天成科技发展有限公司 | AC chopper and chopping method thereof |
| CN201878065U (en) * | 2010-11-16 | 2011-06-22 | 西安交通大学 | SS controller for DC oil pump in generating station |
| CN103021735A (en) * | 2012-12-11 | 2013-04-03 | 福州大学 | Alternating current contactor intelligent control module with high speed pulse width modulation function |
| CN203014727U (en) * | 2013-01-07 | 2013-06-19 | 温州市飞扬电气有限公司 | Speed regulation module of evaporation blower fan |
| CN203399045U (en) * | 2013-05-28 | 2014-01-15 | 扬州大学 | Chopper-control speed regulation and energy conservation device for asynchronous motor |
| JPWO2012176403A1 (en) * | 2011-06-21 | 2015-02-23 | パナソニック株式会社 | Buck / Boost AC / DC Converter |
| CN206217647U (en) * | 2016-11-28 | 2017-06-06 | 株洲中车时代电气股份有限公司 | One kind hands over straight electric locomotive transmission device and system |
| CN206878713U (en) * | 2017-06-20 | 2018-01-12 | 深圳市优威电气技术有限公司 | Intelligent frequency-conversion power supply |
| CN111371376A (en) * | 2020-03-17 | 2020-07-03 | 美的集团股份有限公司 | Adjusting circuit, control method, device, control circuit, household appliance and medium |
| CN111900895A (en) * | 2020-07-14 | 2020-11-06 | 中国电子科技集团公司第十八研究所 | Multi-phase pulse power supply and pulse forming method |
-
2021
- 2021-06-04 CN CN202110626798.0A patent/CN113541505B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588132A (en) * | 2007-11-28 | 2009-11-25 | 北京博旺天成科技发展有限公司 | AC chopper and chopping method thereof |
| CN201878065U (en) * | 2010-11-16 | 2011-06-22 | 西安交通大学 | SS controller for DC oil pump in generating station |
| JPWO2012176403A1 (en) * | 2011-06-21 | 2015-02-23 | パナソニック株式会社 | Buck / Boost AC / DC Converter |
| CN103021735A (en) * | 2012-12-11 | 2013-04-03 | 福州大学 | Alternating current contactor intelligent control module with high speed pulse width modulation function |
| CN203014727U (en) * | 2013-01-07 | 2013-06-19 | 温州市飞扬电气有限公司 | Speed regulation module of evaporation blower fan |
| CN203399045U (en) * | 2013-05-28 | 2014-01-15 | 扬州大学 | Chopper-control speed regulation and energy conservation device for asynchronous motor |
| CN206217647U (en) * | 2016-11-28 | 2017-06-06 | 株洲中车时代电气股份有限公司 | One kind hands over straight electric locomotive transmission device and system |
| CN206878713U (en) * | 2017-06-20 | 2018-01-12 | 深圳市优威电气技术有限公司 | Intelligent frequency-conversion power supply |
| CN111371376A (en) * | 2020-03-17 | 2020-07-03 | 美的集团股份有限公司 | Adjusting circuit, control method, device, control circuit, household appliance and medium |
| CN111900895A (en) * | 2020-07-14 | 2020-11-06 | 中国电子科技集团公司第十八研究所 | Multi-phase pulse power supply and pulse forming method |
Non-Patent Citations (1)
| Title |
|---|
| 许万有 刘金桂: "由IGBT组成的降压BUCK电路的建模及应用仿真" * |
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