CN201584791U - Energy feedback device - Google Patents
Energy feedback device Download PDFInfo
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- CN201584791U CN201584791U CN2009202142853U CN200920214285U CN201584791U CN 201584791 U CN201584791 U CN 201584791U CN 2009202142853 U CN2009202142853 U CN 2009202142853U CN 200920214285 U CN200920214285 U CN 200920214285U CN 201584791 U CN201584791 U CN 201584791U
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- feedback device
- feedback
- contactor
- energy
- fool proof
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Abstract
The utility model discloses an energy feedback device, which is matched with an inverter to use, and comprises a feedback contactor, a wave filter, a feedback device inverter bridge and a fool-proof diode, the feedback device is further provided with a bypass contactor, wherein the feedback contactor, the wave filter, the feedback device inverter bridge and the fool-proof diode are orderly connected to form a feedback pathway, and the inverter is connected with an electric network through the bypass contactor. The energy feedback device can effectively inhibit high frequency circular current which is produced between the feedback device and the inverter when the feedback device feedbacks electric energy to the electric network through using a work mode of matching the two contactors, and effectively prevents the circular current from damaging the inverter.
Description
Technical field:
The utility model relates to a kind of energy conserving system, particularly a kind of energy feedback system that can be used for electric dragging system.
Background technology:
Motor drags the load of potential energy formula when back and forth moving, and motor can constantly enter the generator operation state.At this part electric energy that sends, traditional dragging system all adopts the dynamic braking mode to convert it into heat energy and wastes.It is obvious that this situation particularly seems in elevator.Progressively slow down in running until stopping when arriving destination layer when lift car in the running process of elevator, elevator traction machine will discharge mechanical kinetic energy.Lift car still is a potential energy load simultaneously, because lift car and counterweight is of poor quality, lift car also has mechanical potential energy when operation.Discharge when comprising the unnecessary mechanical energy of potential energy and kinetic energy thereby in running, brake, will make elevator motor be in regenerative power generation state when car, thereby with excess energy " regeneration " the one-tenth electric energy of load.The electric energy of being regenerated will become direct current energy to be stored in the electric capacity of frequency converter DC link with inverter converts by the motor of elevator, if stored electric energy in time can not be discharged, will break down, and elevator can't normally be moved.
Usually in the frequency converter DC link, insert brake unit and brake resistance, make regenerative electric energy be braked resistance by the power consumption circuit that forms thus and discharge, thereby prevent that the frequency converter DC side from causing equipment fault because of regenerative electric energy is excessive with timely consumption of the form of heat energy.This processing mode is exactly a dynamic braking mode common in the tradition.
For recycling the electric energy that wastes in traditional dynamic braking, person skilled is used energy feedback device and frequency converter, the feedback device can feed back to electrical network with the electric energy that sends almost losslessly, both reached energy-conservation purpose, avoid a large amount of heatings of high-power resistance in traditional dynamic braking unit again, improved system running environment.But also there is following problem in feedback device of the prior art when operation:
(1) as shown in Figure 4, when adopting the PWM control strategy, between frequency converter 1 and energy feedback device 2, will produce big circulation 3, and can damage be arranged frequency converter.
(2) when feedback device or frequency converter failure; though the feedback device can stop feedback automatically; but because of not possessing the function of contactor and the self check of fool proof diode function; can't guarantee that feedback device feedback path does not provide electric energy to frequency changer direct current bus, therefore the safe operation to original transmission device causes potential risk.
The utility model content:
The utility model is at the existing problem of above-mentioned energy feedback device, and provide a kind of energy feedback device, this feedback device can effectively suppress the circulation that occurs in the circuit, avoid frequency converter is caused damage, strengthen energy feedback device reliability of operation and fail safe by contactor and fool proof diode are carried out the function self check simultaneously.
In order to achieve the above object, the utility model adopts following technical scheme:
Energy feedback device, be used with frequency converter, described feedback device comprises feedback contactor, filter, feedback device inverter bridge and fool proof diode, described feedback device also comprises bypass contactor, and described feedback contactor, filter, feedback device inverter bridge and fool proof diode are in turn connected to form the feedback path; Described frequency converter connects electrical network by bypass contactor.
The fool proof diode can be a fool proof diode or two fool proof diodes in the described energy feedback device.
Further, also be provided with the function selftest module in the described energy feedback device, this function selftest module comprises fool proof diode function selftest module and feedback contactor function selftest module.
Further again, also be provided with bypass contactor function selftest module in the described energy feedback device.
The utility model that obtains according to technique scheme adopts two contactors can effectively suppress circulation, effectively prevents the damage of circulation to frequency converter.Adopt the control strategy of feedback electric current based on sine wave simultaneously, behind filter filtering, the current/voltage harmonic content of output is low, and is little to electric network pollution.
The utility model also possesses contactor and fool proof diode self-checking function, can guarantee that the feedback path does not provide electric energy to frequency changer direct current bus, avoids the operation of original transmission device is caused potential risk.
The utility model not only can be used under the elevator drive system, and other are various to exist under the electric dragging system of generating operating mode and all can use.
Description of drawings:
Further specify the utility model below in conjunction with the drawings and specific embodiments.
Fig. 1 is a main circuit schematic diagram of the present utility model.
Fig. 2 is another main circuit schematic diagram in the utility model.
Fig. 3 is the circuit diagram of feedback path in the utility model.
Fig. 4 for existing feedback device when feedback and the circulation schematic diagram that produces between frequency converter.
Embodiment:
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
The utility model is for fear of the existing problem of existing electric energy feedback device, and the device of novel energy feedback as illustrated in fig. 1 and 2 is provided.
As shown in Figure 1, this energy feedback device 100 mainly comprises feedback contactor K1, filter, first inverter bridge, the first fool proof diode D1, bypass contactor K2.Wherein electrical network 300 is by frequency converter rectifier bridge 201 power supplies of the bypass contactor K2 in the energy feedback device 100 in frequency converter 200, one side of first inverter bridge 101 is connected to frequency changer direct current bus side 203 (as shown in Figure 3) by the first fool proof diode D1, opposite side is connected with feedback device filter 102, feedback device filter 102 connects electrical network 300 by feedback contactor K1, thereby forms the feedback path.On this feedback path, one second fool proof diode D2 (as shown in Figure 2) can be increased again, the better protection effect can be played; Only adopt the first fool proof diode D1 or the second fool proof diode D2 in actual applications or adopt two fool proof diodes all can satisfy functional requirement simultaneously.
Relating to as shown in Figure 3 of concrete feedback path,, feedback contactor K1 in this path realizes connection and failure protection function to whole feedback path.During to the electrical network feedback electric energy, feedback contactor K1 closure is connected the feedback path at whole feedback device.Corresponding electric energy is that feedback device inverter bridge 101, feedback device filter 102 and K1 are transmitted back to electrical network 300 through frequency changer direct current bus side 203, first inverter bridge successively.When feedback device fault, contactor K1 disconnects, and above-mentioned path is opened circuit, and both can thoroughly cut off electrical network through the path of feedback device inverter bridge to the power supply of frequency changer direct current bus side, can avoid fault further to worsen again.
Bypass contactor K2 is used to control three phase network to 204 power supplies of frequency converter rectifier bridge 201 input sides; The feedback path during to the electrical network feedback electric energy bypass contactor K2 disconnect, can suppress circulation; And it is closed again to finish back bypass contactor K2 in feedback, and electrical network is powered to the frequency converter rectifier bridge through bypass contactor K2.
The PWM voltage that produces when filter 102 is used for feedback device converter bridge switching parts device moved carries out filtering, reduces to be input to the PWM harmonic current of electrical network.
The three-phase brachium pontis that power switch pipe VT1 on the feedback device inverter bridge 101～VT6 forms is used for direct voltage is reverse into alternating voltage.
Fool proof diode D1, D2 are placed in feedback device inverter bridge respectively and connect on the P, N bus of frequency changer direct current bus, can be used for preventing that P, N bus from connecing anti-damage device.But D1 and D2 can adopt in actual applications, also can appoint to get one and all can satisfy application demand.
When the frequency converter 200 that the energy feedback device 100 that obtains according to technique scheme and the frequency converter rectifier bridge 201 and second inverter bridge 202 are formed was used, its concrete running was as follows:
When motor 400 electric operations, bypass contactor K2 closure, the electronic supply access of being made up of K2, frequency converter rectifier bridge and second inverter bridge provides electric energy to motor 400.Feedback this moment device inverter bridge 101 is not worked, and whole electric energy feedback device is in holding state; The alternating current of electrical network 300 is powered to frequency converter rectifier bridge 201 input sides 204 through bypass contactor K2, thereby realizes 400 operations of frequency converter 100 CD-ROM drive motor.
When motor 400 generator operations, the voltage on the frequency changer direct current bus will rise, and the voltage U dc that is connected on the feedback device dc bus with it simultaneously also can rise thereupon.After the voltage U dc on the feedback device dc bus rises to preset threshold, electric energy feedback device 100 will make feedback contactor K1 closure, bypass contactor K2 disconnect, thereby connect the feedback path, disconnect electronic supply access.Electric energy feedback device 100 is controlled on the setting voltage value voltage U dc on the feedback device dc bus by controlling its inverter bridge 101 working methods, and beginning is to electrical network 300 feedback electric energy.Can avoid the appearance of electric energy feedback device device 100 and frequency converter 200 rectifier bridges 201 circulation because bypass contactor K2 disconnects this moment.After feedback electric energy finished, the feedback device entered holding state with closed K2.
When energy feedback device detects catastrophe failure, with the function of forbidding voluntarily to the electrical network feedback electric energy, and disconnection feedback contactor K1 makes the thorough and electrical network disconnection of feedback path, simultaneously closed bypass contactor K2 guarantees that frequency converter can continue to obtain electric energy through bypass contactor K2 from electrical network, keeps the continuation reliability service of frequency converter.
For the Primary Component that can in time know electric energy feedback device whether normal, further reduce of the influence of feedback device faults itself to drive system, also be provided with the function selftest module in the energy feedback device that the utility model provides, this function selftest module comprises fool proof diode function selftest module and feedback contactor function selftest module; Further, also be provided with bypass contactor function selftest module in the energy feedback device.These three modules make the energy feedback device of this patent to have self-checking function to fool proof diode, feedback contactor K1 and bypass contactor K2.Being achieved as follows of the self-checking function of corresponding module:
Fool proof diode self-checking function:
Not doing under the fool proof diode function self check situation, when feedback moved, the feedback device was provided with the instruction of self DC bus-bar voltage lower slightly than the operation voltage of frequency converter dynamic braking unit.When doing the self check of fool proof diode, the feedback device is provided with the instruction of self DC bus-bar voltage to such an extent that exceed certain threshold values than the operation voltage of frequency converter dynamic braking unit in regeneration processes, if after this feedback device actual DC busbar voltage can rise to this value of setting, illustrate that then the fool proof diode operation is normal; If voltage, then illustrates the short circuit damage of fool proof diode less than maybe rising to frequency converter brake unit operating point voltage, energy feedback device will be stopped to the electrical network feedback electric energy, and disconnect the feedback contactor.
Feedback contactor K1 self-checking function, the utility model can be realized by following dual mode:
(1) in the process of feedback electric energy, energy feedback device sends the K1 cut-off signal to the feedback device, energy feedback device is provided with the instruction of self DC bus-bar voltage and is higher than frequency converter brake unit operating point voltage one specific threshold and controls the feedback contactor in special time and make it be in off-state, makes energy feedback device enter operating state to the electrical network feedback electric energy simultaneously; If can reach described voltage instruction value or energy feedback device grid side electric current exceeds certain specific threshold in this special time self-energy feedback device actual DC busbar voltage, showing then that the feedback contactor occurs can't normally open fault; If fail to reach described voltage instruction value, show that then feedback contactor function is normal in this special time self-energy feedback device actual DC busbar voltage.
(2) give feedback contactor K1 equipped auxiliary contact, the information of utilizing the output of K1 auxiliary contact is as feedback signal, and the feedback contactor K1 control signal of sending with energy feedback device compares.If both signals are inconsistent, feedback contactor K1 operation irregularity is described then; If both signal unanimities illustrate that then feedback contactor K1 is working properly.
Bypass contactor K2 self-checking function:
Give bypass contactor K2 equipped auxiliary contact, the information of utilizing the output of bypass contactor K2 auxiliary contact is as feedback signal, and the bypass contactor K2 control signal of sending with energy feedback device compares.If both signals are inconsistent, bypass contactor K2 operation irregularity is described then; If both signal unanimities illustrate that then bypass contactor K2 is working properly.
Because above-mentioned self-checking function, make energy feedback device that this patent provides when detecting fault, with forbidding self function automatically, disconnect the feedback contactor simultaneously to the electrical network feedback electric energy, and the bypass contactor that closes; Frequency converter obtains electric energy by bypass contactor from electrical network and works under the cooperation of self dynamic braking unit afterwards.
The utility model that is obtained by technique scheme adopts the control strategy of feedback electric current based on sine wave, and behind filter filtering, the current/voltage harmonic content of output is low, and is little to electric network pollution.When feedback, by disconnecting bypass contactor K2, the circulation that brings in the time of can suppressing the action of feedback device converter bridge switching parts fully.When fault, disconnect and the unidirectional on state characteristic of fool proof diode by control bypass contactor K2 closure and feedback contactor K1, make frequency converter under the cooperation of self dynamic braking unit, obtain electric energy from electrical network and work on, thereby can be good at guaranteeing that the fault of feedback device self does not influence the continuation operation and the security performance of original drive system by bypass contactor.
The utility model also can be applicable in other various electric dragging systems that have a generating operating mode, and its concrete scheme implemented and running are not given unnecessary details as mentioned above herein.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. energy feedback device, be used with frequency converter, described feedback device comprises feedback contactor, filter, feedback device inverter bridge and fool proof diode, it is characterized in that, described feedback device also comprises bypass contactor, and described feedback contactor, filter, feedback device inverter bridge and fool proof diode are in turn connected to form the feedback path; Described frequency converter connects electrical network by bypass contactor.
2. energy feedback device according to claim 1 is characterized in that, the fool proof diode can be a fool proof diode or two fool proof diodes in the described energy feedback device.
3. energy feedback device according to claim 1 is characterized in that, also is provided with the function selftest module in the described energy feedback device, and this function selftest module comprises fool proof diode function selftest module and feedback contactor function selftest module.
4. energy feedback device according to claim 1 is characterized in that, also is provided with bypass contactor function selftest module in the described energy feedback device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202142853U CN201584791U (en) | 2009-11-27 | 2009-11-27 | Energy feedback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202142853U CN201584791U (en) | 2009-11-27 | 2009-11-27 | Energy feedback device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201584791U true CN201584791U (en) | 2010-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202142853U Expired - Fee Related CN201584791U (en) | 2009-11-27 | 2009-11-27 | Energy feedback device |
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| Country | Link |
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| CN (1) | CN201584791U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108403380A (en) * | 2018-04-03 | 2018-08-17 | 伊士通（上海）医疗器械有限公司 | A kind of rehabilitation exercise equipment control system and control method based on energy feedback |
-
2009
- 2009-11-27 CN CN2009202142853U patent/CN201584791U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108403380A (en) * | 2018-04-03 | 2018-08-17 | 伊士通（上海）医疗器械有限公司 | A kind of rehabilitation exercise equipment control system and control method based on energy feedback |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20121127 |