CN104401829A - Overheat protection method and device for power device of elevator frequency converter - Google Patents
Overheat protection method and device for power device of elevator frequency converter Download PDFInfo
- Publication number
- CN104401829A CN104401829A CN201410525287.XA CN201410525287A CN104401829A CN 104401829 A CN104401829 A CN 104401829A CN 201410525287 A CN201410525287 A CN 201410525287A CN 104401829 A CN104401829 A CN 104401829A
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- China
- Prior art keywords
- elevator
- frequency converter
- temperature
- described temperature
- power device
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
Abstract
The invention discloses an overheat protection method and device for a power device of an elevator frequency converter. The method comprises the following steps: detecting temperature T of the power device of the elevator frequency converter; comparing the detected temperature T with a first overheat protection preset temperature T1; reducing the carrier frequency of the elevator frequency converter below a preset value, switching a modulation method of the elevator frequency converter from three-phase modulation to two-phase modulation and slowing the operation of an elevator and stopping the elevator at a nearest layer when the temperature T is greater than the first preset temperature T1. The device includes a temperature detecting module, a temperature judging module, a carrier frequency switching module and a modulation mode switching module. By applying the method and device provided by the utility model, sudden stop of the elevator caused by over heat of the frequency converter and passenger trapping can be avoided, so that operation safety of the elevator can be improved.
Description
Technical field
The present invention relates to a kind of method for excessive heating protection and device of elevator frequency converter power device.
Background technology
The overheating protection of frequency converter mainly contains two kinds of methods:
Method one, sets overheating protection temperature threshold T1 when ensureing that transducer power device is no more than maximum permissible temperature.The temperature T of real-time detection power device in the process that frequency converter runs, when this temperature T is greater than overheating protection temperature threshold T1, stops frequency converter exporting, avoids transducer power device failure.
Method two, sets overheating protection temperature threshold T1 and T2 when ensureing that transducer power device is no more than maximum permissible temperature, and T2>T1.The temperature T of real-time detection power device in the process that frequency converter runs, as this temperature T>T2, stops frequency converter exporting; As this temperature T1<T<T2, reduce the horsepower output of frequency converter.
Elevator frequency converter adopts method one to do overheating protection usually, but elevator emergency can be caused like this to stop, even oppressive.Method two is not also suitable for the occasion of elevator, this is because the load in running process of elevator is constant, therefore when detecting power device temperature T1<T<T2, can not reduce the horsepower output of frequency converter.
Summary of the invention
Based on this; the invention reside in the defect overcoming prior art, provide a kind of method for excessive heating protection and device of elevator frequency converter power device, it can overcome the urgency that elevator causes because frequency converter is overheated and stop; even oppressive phenomenon, is conducive to the safety improving elevator operation.
For overcoming above-mentioned defect, the method for excessive heating protection of elevator frequency converter power device of the present invention, comprises the following steps: the temperature T detecting elevator frequency converter power device; Detected temperature T is carried out differentiation with overheating protection first preset temperature T1 compare: when described temperature T is greater than described first preset temperature T1; the carrier frequency of elevator frequency converter is reduced to below preset value; and the modulation system of elevator frequency converter is switched to two-phase modulation by three-phase modulations, and deceleration of elevator is made to move to closest layer parking.
For overcoming above-mentioned defect, the over temperature protection system of elevator frequency converter power device of the present invention, comprising: temperature detecting module, for detecting the temperature T of elevator frequency converter power device; Temperature discrimination module, compares for the temperature T of the elevator frequency converter detected power device is carried out differentiation with overheating protection first preset temperature T1; Carrier frequency handover module, for being reduced to below preset value by the carrier frequency of elevator frequency converter, and for being preset value by the carrier frequency recovery of elevator frequency converter; Modulation system handover module, for realizing the switching of modulation system between three-phase modulations and two-phase modulation of elevator frequency converter.
According to method for excessive heating protection and the device of elevator frequency converter power device of the present invention; can when elevator frequency converter occurs overheated; reduce the carrier frequency of described frequency converter; and the modulation system of elevator frequency converter is switched to two-phase modulation by three-phase modulations, make deceleration of elevator move to closest layer and stop.Therefore, the method and device can overcome the urgency that elevator causes because frequency converter is overheated and stop, even oppressive phenomenon, are conducive to improving the safety that elevator runs.
Accompanying drawing explanation
Fig. 1 is the construction module schematic diagram of the over temperature protection system of elevator frequency converter power device described in the embodiment of the present invention.
Fig. 2 is the diagram of circuit of the method for excessive heating protection of elevator frequency converter power device described in the embodiment of the present invention.
Description of reference numerals:
10, temperature detecting module, 20, temperature discrimination module, 30, carrier frequency handover module, 40, modulation system handover module, 50, velocity curve processing module, 60, stop frequency converter output module.
Detailed description of the invention
Below embodiments of the invention are described in detail:
As shown in Figure 1, a kind of over temperature protection system of elevator frequency converter power device, it comprises:
Temperature detecting module 10, for detecting the temperature T of elevator frequency converter power device in real time;
Temperature discrimination module 20, compare for the temperature T of the elevator frequency converter detected power device is carried out differentiation with overheating protection first preset temperature T1, and compare for the temperature T of the elevator frequency converter detected power device is carried out differentiation with described overheated recovery preset temperature T0, and compare for described temperature T is carried out differentiation with described overheating protection second preset temperature T2; Specifically, this temperature discrimination module 20 can be used in differentiating whether the elevator frequency converter power device temperature T detected in real time is greater than overheating protection first preset temperature T1, differentiate whether the elevator frequency converter power device temperature T detected in real time is greater than overheating protection second preset temperature T2, and differentiate whether the elevator frequency converter power device temperature T detected in real time is less than overheated recovery preset temperature T0;
The carrier frequency recovery of elevator frequency converter for the carrier frequency of elevator frequency converter is reduced to 1/4th of preset value, or is preset value by carrier frequency handover module 30;
Modulation system handover module 40, for realizing the switching of modulation system between three-phase modulations and two-phase modulation of elevator frequency converter; Namely the modulation system of elevator frequency converter can switch to two-phase to modulate by three-phase modulations by this modulation system handover module 40, also the modulation system of elevator frequency converter can be modulated by two-phase and revert to three-phase modulations;
Velocity curve processing module 50, for generating corresponding speed run curve according to the speed running state of elevator, enables elevator run according to corresponding speed run curve; Specifically, when elevator is in Accelerating running state, this velocity curve processing module 50 can generate First Speed run curve, elevator can be run according to this First Speed run curve after stopping is accelerated, and elevator be in travel at the uniform speed state time, this velocity curve processing module 50 generates second speed run curve, elevator is run according to this second speed run curve, elevator be in run slowly state time this velocity curve processing module 50 generate third speed run curve, elevator is run according to third speed run curve;
Stop frequency converter output module 60, for cutting off the output of elevator frequency converter PWM.
As shown in Figure 2, the present embodiment also provides a kind of method for excessive heating protection of elevator frequency converter power device, specifically comprises the following steps:
Step S10: the temperature T being detected elevator frequency converter power device by temperature detecting module 10 in real time;
Step S20: call temperature discrimination module 20 and differentiate whether described temperature T is greater than overheating protection first preset temperature T1, if so, then enters step S30, if not, then returns step S10;
Step S30: elevator frequency converter enters overheated operational mode, makes the carrier frequency of elevator frequency converter be reduced to 1/4th of preset value, and makes the modulation system of elevator frequency converter switch to two-phase modulation by three-phase modulations, then enters step S40;
Step S40: judge whether elevator is in acceleration: if so, then enter step S50; If not, then step S60 is entered;
Step S50: make elevator stop accelerating, and call velocity curve processing module 50 and generate First Speed run curve, makes elevator run slowly to closest layer according to this First Speed run curve and stops, then enter step S80;
Step S60: judge whether elevator is in the process of traveling at the uniform speed: if so, then enter step S70; If not, then step S80 is entered;
S70: call velocity curve processing module 50 and generate second speed run curve, makes elevator run slowly to closest layer according to second speed run curve and stops;
Certainly, when elevator operationally, if elevator is neither in Accelerating running, neither in traveling at the uniform speed, then show that elevator is in the state of running slowly, now, without the need to carrying out change process to this corresponding third speed curve that runs slowly, only elevator need be allowed to move to closest layer according to this third speed run curve and stopping;
Step S80: the temperature T of elevator frequency converter power device is detected again, and enters step S90;
Whether step S90: call temperature discrimination module 20, the temperature T obtained in determining step S80 are less than overheated recovery preset temperature T0: if so, then enter step S100; If not, then step S110 is entered;
Step S100, by the carrier frequency recovery of elevator frequency converter to preset value, and reverts to three-phase modulations by the modulation system of elevator frequency converter by two-phase modulation, then returns and perform step S80;
Whether step S110: continue to call temperature discrimination module 20, the temperature T obtained in determining step S80 are greater than overheating protection second preset temperature T2: if so, then enter step S120, if not, then enter step S130;
Step S120: call and stop frequency converter output module 60, stops the output of elevator frequency converter;
Step S130: continue to call temperature discrimination module 20 again, whether the temperature T obtained in determining step S80 is greater than overheating protection first preset temperature T1: if so, then enter step S140; If not, then step S80 is returned;
Step S140: make the carrier frequency of elevator frequency converter continue to be set to 1/4th of preset value, and the modulation system of this elevator frequency converter is continued be set to two-phase modulation, then return step S80.
In a word, the method of the present embodiment and device pass through the carrier frequency of elevator frequency converter and the Reasonable adjustment of modulation system, and by suitable process settings, make elevator frequency converter also can export rating horsepower in overheated, passenger is delivered to level position, thus avoid that the urgency that elevator causes because frequency converter is overheated is stopped, even oppressive phenomenon, be conducive to improving the safety that elevator runs.
The above embodiment only have expressed the specific embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (11)
1. a method for excessive heating protection for elevator frequency converter power device, is characterized in that, the method comprises the following steps:
Detect the temperature T of elevator frequency converter power device;
Described temperature T is carried out differentiation with overheating protection first preset temperature T1 compare: when described temperature T is greater than described first preset temperature T1; the carrier frequency of elevator frequency converter is reduced to below preset value; and the modulation system of elevator frequency converter is switched to two-phase modulation by three-phase modulations, and deceleration of elevator is made to move to closest layer parking.
2. the method for excessive heating protection of elevator frequency converter power device according to claim 1, it is characterized in that, move in the step of closest layer parking making deceleration of elevator, prejudge the speed running state of elevator: if elevator is in Accelerating running state, elevator is then made to stop accelerating, and call velocity curve processing module and generate First Speed run curve, elevator is run slowly to closest layer according to this First Speed run curve and stops; If elevator is in the state of traveling at the uniform speed, then calls velocity curve processing module and generate second speed run curve, elevator is run slowly to closest layer according to this second speed run curve and stops; If elevator is in the state of running slowly, then the third speed run curve making elevator corresponding according to this state that runs slowly continues to run, and layer stops as of late.
3. the method for excessive heating protection of elevator frequency converter power device according to claim 1, is characterized in that, in the step of carrier frequency reducing elevator frequency converter, the carrier frequency of this elevator frequency converter is reduced to 1/4th of preset value.
4. the method for excessive heating protection of the elevator frequency converter power device according to any one of claims 1 to 3, it is characterized in that, move to closest layer making deceleration of elevator to stop and after sending command adapted thereto, described method for excessive heating protection also comprises following temperature range discriminating step: detect the temperature T of elevator frequency converter power device again, and by obtain temperature T respectively with overheated recovery preset temperature T0, overheating protection first preset temperature T1 and overheating protection second preset temperature T2 carries out differentiation and compares: if described temperature T is less than described temperature T0, be then preset value by the carrier frequency recovery of elevator frequency converter, and the modulation system of elevator frequency converter is reverted to three-phase modulations by two-phase modulation, if described temperature T is between described temperature T1 and described temperature T2, then the carrier frequency of elevator frequency converter is set to 1/4th of preset value, and the modulation system of elevator frequency converter is set to two-phase modulation, if described temperature T is greater than described temperature T2, then stop the output of elevator frequency converter, wherein, described T2 is greater than described temperature T1, and described temperature T1 is greater than described temperature T0.
5. the method for excessive heating protection of elevator frequency converter power device according to claim 4, it is characterized in that, described temperature range discriminating step specifically comprises: first the temperature T of the elevator frequency converter power device obtained in described detecting step is again carried out differentiation with described overheated recovery preset temperature T0 and compare, if described temperature T is less than described temperature T0, be then preset value by the carrier frequency recovery of elevator frequency converter, and the modulation system of elevator frequency converter is reverted to three-phase modulations by two-phase modulation, and then return the detecting step again to described temperature T; If when described temperature T is more than or equal to described temperature T0, then this temperature T and described temperature T2 is carried out differentiation and compare.
6. the method for excessive heating protection of elevator frequency converter power device according to claim 5, it is characterized in that, when described temperature T and described temperature T2 being carried out differentiation and comparing: if described temperature T is greater than described temperature T2, then stop the output of described elevator frequency converter; If described temperature T is less than or equal to described temperature T2, then described temperature T is carried out differentiation with described temperature T1 again and compare.
7. the method for excessive heating protection of elevator frequency converter power device according to claim 6, it is characterized in that, when described temperature T being carried out differentiation with described temperature T1 again and comparing: if described temperature T is greater than described temperature T1, then the carrier frequency of described elevator frequency converter is set to 1/4th of preset value, and the modulation system of this elevator frequency converter is set to two-phase modulation, and then return the detecting step again to described temperature T; If described temperature T is less than described temperature T1, then directly return the detecting step again to described temperature T.
8. an over temperature protection system for elevator frequency converter power device, is characterized in that, it comprises:
Temperature detecting module, for detecting the temperature T of elevator frequency converter power device;
Temperature discrimination module, compares for the temperature T of the elevator frequency converter detected power device is carried out differentiation with overheating protection first preset temperature T1;
Carrier frequency handover module, for being reduced to below preset value by the carrier frequency of elevator frequency converter, and for being preset value by the carrier frequency recovery of elevator frequency converter;
Modulation system handover module, for realizing the switching of modulation system between three-phase modulations and two-phase modulation of elevator frequency converter.
9. the over temperature protection system of elevator frequency converter power device according to claim 8; it is characterized in that; also comprise velocity curve processing module; First Speed run curve is generated during for being in Accelerating running state at elevator; second speed run curve is generated when elevator is in and travels at the uniform speed state; generate third speed run curve when elevator is in and runs slowly state, run according to corresponding speed run curve to make elevator.
10. the over temperature protection system of elevator frequency converter power device according to claim 8; it is characterized in that; described temperature discrimination module also compares for the temperature T of the elevator frequency converter detected power device is carried out differentiation with described overheated recovery preset temperature T0, and compares for described temperature T is carried out differentiation with described overheating protection second preset temperature T2.
The over temperature protection system of 11. elevator frequency converter power devices according to claim 8, is characterized in that, also comprises and stops frequency converter output module, for cutting off the output of elevator frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410525287.XA CN104401829B (en) | 2014-10-08 | 2014-10-08 | The method for excessive heating protection of elevator frequency converter power device and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410525287.XA CN104401829B (en) | 2014-10-08 | 2014-10-08 | The method for excessive heating protection of elevator frequency converter power device and device |
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| Publication Number | Publication Date |
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| CN104401829A true CN104401829A (en) | 2015-03-11 |
| CN104401829B CN104401829B (en) | 2016-11-23 |
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| CN201410525287.XA Active CN104401829B (en) | 2014-10-08 | 2014-10-08 | The method for excessive heating protection of elevator frequency converter power device and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108141171A (en) * | 2015-09-29 | 2018-06-08 | 株式会社日立产机系统 | Electric rotating machine and electric rotating machine assembly |
| CN110247370A (en) * | 2018-03-07 | 2019-09-17 | 广东美的生活电器制造有限公司 | The control method for over-heating protection and device of food processor and its power device |
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| CN110247370B (en) * | 2018-03-07 | 2021-07-20 | 广东美的生活电器制造有限公司 | Food processor and overheat protection control method and device of power device of food processor |
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| CN104401829B (en) | 2016-11-23 |
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