CN109217649A - A kind of pre-charge circuit and precharge frequency changing driving system - Google Patents
A kind of pre-charge circuit and precharge frequency changing driving system Download PDFInfo
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- CN109217649A CN109217649A CN201811346647.4A CN201811346647A CN109217649A CN 109217649 A CN109217649 A CN 109217649A CN 201811346647 A CN201811346647 A CN 201811346647A CN 109217649 A CN109217649 A CN 109217649A
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- precharge
- charge circuit
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- 238000007600 charging Methods 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 abstract description 12
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 238000002955 isolation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 101150110971 CIN7 gene Proteins 0.000 description 3
- 102100031437 Cell cycle checkpoint protein RAD1 Human genes 0.000 description 3
- 101001130384 Homo sapiens Cell cycle checkpoint protein RAD1 Proteins 0.000 description 3
- 101150110298 INV1 gene Proteins 0.000 description 3
- 101100397044 Xenopus laevis invs-a gene Proteins 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of pre-charge circuits and precharge frequency changing driving system, are related to converter technique, precharge frequency changing driving system includes pre-charge circuit, transformer and several frequency converters, and frequency converter is separately connected several output ends of transformer；Pre-charge circuit includes main switch, precharge switch and 3 charging resistors；Main switch and precharge switch include 3 contacts, and charging resistor is separately connected 3 contacts of precharge switch, constitute precharge branch；Precharge branch is separately connected the both ends of 3 contacts of main switch；Terminals of the both ends of main switch as pre-charge circuit, the terminals of pre-charge circuit are located at the same side of transformer；Frequency converter includes storage capacitor, pre-charge circuit for changing storage capacitor two sides voltage；Pre-charge circuit is designed in the side of the transformer of frequency changing driving system, insulating monitoring false alarm in frequency converter pre-charge process is solved the problems, such as, realizes the purpose that frequency changing driving system is isolated with ambient systems overall process.
Description
Technical field
The present invention relates to converter technique, specially a kind of pre-charge circuit and precharge frequency changing driving system.
Background technique
Frequency changing driving system includes transformer, and transformer can carry out transformation, isolation and phase shift processing, for entire frequency conversion
Drive system plays an important role, control unit of the frequency converter as whole system, also bears the function of system insulation monitoring.
It is provided with storage capacitor in frequency converter, needs to carry out low pressure to the storage capacitor in frequency converter when starting frequency changing driving system pre-
Charging.
Existing frequency changing driving system is pre-charged by the way of Fig. 1 or Fig. 2.In Fig. 1, charging resistor and preliminary filling
Electric switch constitute series connection group one end connection frequency converter current rectifying front-end, the other end connect main switch front end, to frequency converter into
Row exchange side charging；In Fig. 2, series connection group one end that charging resistor, rectifier bridge and precharge switch are constituted connects the whole of frequency converter
Rear end is flowed, the other end connects the front end of main switch, carries out DC side charging to frequency converter.When precharge, main switch is closed, is opened
Precharge switch, the partial pressure due to filling resistance act on, and carry out low pressure charging to frequency converter；When normal work, main switch is opened,
Precharge switch is closed, with high voltage drive frequency converter normal work.
But existing drive system is in pre-charge process, transformer loses the effect as isolation, frequency converter with
Ambient systems have carried out of short duration interconnection, while frequency converter type insulation monitoring system and external insulation monitoring system also form interconnection,
Conflict will be present in two sides monitoring, will have alarm to generate at this time, and the incompatible scene of a degree of system is caused to occur.
Summary of the invention
The purpose of the present invention is to provide a kind of pre-charge circuits and precharge frequency changing driving system., to solve above-mentioned back
The problem of being proposed in scape technology.
To achieve the above object, the invention provides the following technical scheme: a kind of pre-charge circuit, including main switch, first
Precharge switch and 3 charging resistors；The main switch and first precharge switch include 3 contacts；
One end of 3 charging resistors is separately connected one end of 3 contacts of first precharge switch, and described 3
The other end of a charging resistor is separately connected one end of 3 contacts of the main switch；And 3 first precharge switch
The other end of 3 contacts is separately connected the other end of 3 contacts of the main switch；The both ends of 3 contacts of the main switch
Respectively as two three-phase terminals of the pre-charge circuit.
Further, the pre-charge circuit further includes the second precharge switch, and second precharge switch also includes 3
A contact, 3 contacts of second precharge switch are connected on 3 of 3 charging resistors and the main switch respectively
Between contact.
Further, the main switch is three-phase ac contactor.
Further, the precharge switch is three-phase ac contactor.
The invention also provides a kind of precharge frequency changing driving systems, including a transformer, several frequency converters and one
Pre-charge circuit described in any one of a claim 1-4；The frequency converter includes storage capacitor；The frequency converter
Input terminal is separately connected several output ends of the transformer, and the output end of the frequency converter is for connecting electrical appliance；It is described
One three-phase terminal of pre-charge circuit connects the input terminal of the transformer, and another of the pre-charge circuit three connects
Line end is for connecting the three phase mains.
The invention also provides a kind of precharge frequency changing driving systems, if including a transformer, several frequency converters and
Pre-charge circuit described in any one of dry claim 1-4；The frequency converter includes storage capacitor, and the frequency conversion
Device includes two three-phase input ends；The number of the pre-charge circuit is twice of the frequency converter, and the precharge is electric
The three-phase input end of road and several frequency converters corresponds；
The input terminal of the transformer is for connecting three phase mains；One three-phase terminal of the pre-charge circuit is distinguished
Several three-phase output ends of the transformer are connected, another three-phase terminal of the pre-charge circuit is separately connected correspondence
The frequency converter three-phase input end；The output end of the frequency converter is respectively used to connection electrical appliance.
Compared with prior art, beneficial effects of the present invention are as follows:
1. pre-charge circuit is designed in one end of the transformer of frequency changing driving system, by the control to precharge switch,
The preliminary filling electric treatment for realizing the storage capacitor in frequency converter, solves the insulating monitoring false alarm in frequency converter pre-charge process
Problem realizes the purpose that frequency changing driving system is isolated with ambient systems overall process.
2. being provided with main switch and precharge switch simultaneously, allows frequency converter in pre-charge state, works normally shape
Switch between state and stop working state.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the existing frequency changing driving system using exchange side precharge mode；
Fig. 2 is the structural schematic diagram of the existing frequency changing driving system using DC side precharge mode；
Fig. 3 is the electrical block diagram of present invention precharge frequency changing driving system embodiment one；
Fig. 4 is the electrical block diagram of present invention precharge frequency changing driving system embodiment two.
In appended drawing reference: pre-charge circuit 1；Transformer 2；Frequency converter 3.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
As shown in figure 3, the present embodiment proposes a kind of precharge frequency changing driving system, including pre-charge circuit 1, transformer
2 and three frequency converters 3.
Pre-charge circuit 1 include main switch Q1, the first precharge switch K1, the second precharge switch K2, charging resistor R1,
Charging resistor R2 and charging resistor R3.Main switch Q1, the first precharge switch K1 and the second precharge switch K2 are three intersections
There are three contacts for galvanic electricity contactor, all tool.One end of charging resistor R1, charging resistor R2 and charging resistor R3 are separately connected first
One end of three contacts of precharge switch K1, the other end of charging resistor R1, charging resistor R2 and charging resistor R3 connect respectively
Connect one end of three contacts of the second precharge switch K2.And first the other end of three contacts of precharge switch K1 connect respectively
One end of three contacts of main switch Q1 is connect, the other end of three contacts of the second precharge switch K2 is separately connected main switch Q1
Three contacts the other end.
The both ends of three contacts of main switch Q1 respectively as pre-charge circuit 1 two three-phase terminals, one of them
Three-phase terminal connects three-phase alternating-current supply, another three-phase terminal connects the three-phase input end of transformer 2.Due to charging
The two sides of resistance R1, charging resistor R2 and charging resistor R3 are provided with the first precharge switch K1 and the second precharge switch simultaneously
K2 makes it possible to more steadily cut off the connection of charging resistor R1, charging resistor R2 and charging resistor R3 and circuit, more pacifies
Entirely, it prevents from only generating in the case where the electrification of the other side when side is installed and switched dangerous.
Each frequency converter 3 includes rectification module REC1, storage capacitor C1 and inverter module INV1.Rectification module REC1 and
The DC terminal of inverter module INV1 is connected with each other by two-way DC line, and to be separately connected two-way straight at the both ends of storage capacitor C1
Flow Line.Storage capacitor C1 absorbs energy when DC voltage is larger, and energy is released when DC current is smaller, plays inhibition
The effect of voltage fluctuation.The exchange end of rectification module REC1 is all connected with the output end of transformer 2, the exchange end of inverter module INV1
Electrical appliance is connected, realizes the frequency control of electrical appliance.
Since storage capacitor C1 original state is equivalent to short circuit, if directly big voltage is added on storage capacitor C1, just
The electric current that moment passes through on storage capacitor C1 can be made very big, the service life decline of storage capacitor C1, and there is the risk of explosion.Cause
This, needs first to carry out storage capacitor C1 before the normal work of frequency converter 3 precharge of low pressure, when precharge, closes main switch
Q1 opens the first precharge switch K1 and the second precharge switch K2, makes charging resistor R1, charging resistor R2 and charging resistor R3
The effect of partial pressure is each served as, the voltage of the two sides storage capacitor C1 reduces.After the completion of storage capacitor C1 precharge, main switch is opened
Q1 closes the first precharge switch K1 and the second precharge switch K2, cutting charging resistor R1, charging resistor R2 and charging resistor
Connection in R3 and circuit is worked with normal operating voltage driving frequency converter 3.Simultaneously close off main switch Q1, the first precharge
Switch K1 and the second precharge switch K2, so that it may so that frequency converter 3 stops working, reduce waste of energy.
The input side of transformer 2 is arranged in pre-charge circuit 1 by the precharge frequency changing driving system of the present embodiment, to energy storage
When capacitor C1 is pre-charged, pre-charge circuit 1 does not connect the two sides of transformer 2, and transformer 2 is made to continue to play the role of isolation,
It solves the problems, such as the insulating monitoring false alarm in frequency converter pre-charge process, it is complete with ambient systems to realize frequency changing driving system
The purpose of process isolation.Meanwhile multiple frequency converters 3 can be controlled simultaneously using only a pre-charge circuit 1, saved at
This, and realize centralized control.
Embodiment two
What is different from the first embodiment is that as shown in figure 4, the input terminal of transformer 2 is directly connected to three-phase alternating-current supply.This reality
The precharge frequency changing driving system for applying example includes 6 pre-charge circuits 1, since three frequency converters 3 pass through two three-phase circuits
The output end for connecting transformer 2 shares six three-phase circuit connection frequency converters 3 and transformer 2.6 pre-charge circuits 1 and this six
Three-phase circuit corresponds, and is connected on this six three-phase circuits respectively.
Although the precharge frequency changing driving system of the present embodiment cannot realize centralized control as in embodiment one,
It is the working condition that can be controlled separately each frequency converter 3, operates more flexible.Since each pre-charge circuit 1 is respectively positioned on change
The outlet side of depressor 2, in storage capacitor C1 precharge, pre-charge circuit 1 also without the two sides of connection transformer 2, makes transformation
Device 2 still plays the role of isolation, solves the problems, such as the insulating monitoring false alarm in frequency converter pre-charge process, realizes frequency conversion
The purpose that drive system is isolated with ambient systems overall process.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of pre-charge circuit, which is characterized in that including main switch, the first precharge switch and 3 charging resistors；The master
Switch and first precharge switch include 3 contacts；
One end of 3 charging resistors is separately connected one end of 3 contacts of first precharge switch, and described 3 are filled
The other end of resistance is separately connected one end of 3 contacts of the main switch；And 3 of 3 first precharge switch
The other end of contact is separately connected the other end of 3 contacts of the main switch；
Two three-phase terminals of the both ends of 3 contacts of the main switch respectively as the pre-charge circuit.
2. a kind of pre-charge circuit according to claim 1, which is characterized in that it further include the second precharge switch, it is described
Second precharge switch also includes 3 contacts, and 3 contacts of second precharge switch are connected on 3 chargings respectively
Between resistance and 3 contacts of the main switch.
3. a kind of pre-charge circuit according to claim 1, which is characterized in that the main switch is three-phase alternating current contact
Device.
4. a kind of pre-charge circuit according to claim 1, which is characterized in that the precharge switch is that three-phase alternating current connects
Tentaculum.
5. a kind of precharge frequency changing driving system, which is characterized in that including a transformer, several frequency converters and a right
It is required that pre-charge circuit described in any one of 1-4；The frequency converter includes storage capacitor；The input terminal of the frequency converter
Several output ends of the transformer are separately connected, the output end of the frequency converter is for connecting electrical appliance；The precharge
One three-phase terminal of circuit connects the input terminal of the transformer, another three-phase terminal of the pre-charge circuit is used
In the connection three phase mains.
6. a kind of precharge frequency changing driving system, which is characterized in that including a transformer, several frequency converters and several power
Benefit requires pre-charge circuit described in any one of 1-4；The frequency converter includes storage capacitor, and the frequency converter wraps
Include two three-phase input ends；The number of the pre-charge circuit is twice of the frequency converter, and the pre-charge circuit and institute
The three-phase input end for stating several frequency converters corresponds；
The input terminal of the transformer is for connecting three phase mains；One three-phase terminal of the pre-charge circuit is separately connected
Several three-phase output ends of the transformer, another three-phase terminal of the pre-charge circuit are separately connected corresponding institute
State the three-phase input end of frequency converter；The output end of the frequency converter is respectively used to connection electrical appliance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811346647.4A CN109217649A (en) | 2018-11-13 | 2018-11-13 | A kind of pre-charge circuit and precharge frequency changing driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811346647.4A CN109217649A (en) | 2018-11-13 | 2018-11-13 | A kind of pre-charge circuit and precharge frequency changing driving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109217649A true CN109217649A (en) | 2019-01-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811346647.4A Pending CN109217649A (en) | 2018-11-13 | 2018-11-13 | A kind of pre-charge circuit and precharge frequency changing driving system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130616A (en) * | 2011-03-28 | 2011-07-20 | 株洲南车时代电气股份有限公司 | Device and method for controlling precharge on frequency converter |
| CN102594159A (en) * | 2012-02-16 | 2012-07-18 | 华为技术有限公司 | Intermediate-voltage concatenated frequency converter, pre-charging method and system |
| CN202616989U (en) * | 2012-05-14 | 2012-12-19 | 安徽颐和新能源科技股份有限公司 | Device for providing pre-charging function and low-voltage debugging power supply function for cascaded high-voltage inverter |
| CN203014685U (en) * | 2012-11-19 | 2013-06-19 | 苏州汇川技术有限公司 | Series connection type high-voltage frequency converter and pre-charging circuit |
| CN103647458A (en) * | 2013-12-24 | 2014-03-19 | 苏州汇川技术有限公司 | Frequency conversion system and method and device for precharging high-voltage frequency converter in frequency conversion system |
| CN209072333U (en) * | 2018-11-13 | 2019-07-05 | 上海中车汉格船舶与海洋工程有限公司 | A kind of pre-charge circuit and precharge frequency changing driving system |
-
2018
- 2018-11-13 CN CN201811346647.4A patent/CN109217649A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130616A (en) * | 2011-03-28 | 2011-07-20 | 株洲南车时代电气股份有限公司 | Device and method for controlling precharge on frequency converter |
| CN102594159A (en) * | 2012-02-16 | 2012-07-18 | 华为技术有限公司 | Intermediate-voltage concatenated frequency converter, pre-charging method and system |
| CN202616989U (en) * | 2012-05-14 | 2012-12-19 | 安徽颐和新能源科技股份有限公司 | Device for providing pre-charging function and low-voltage debugging power supply function for cascaded high-voltage inverter |
| CN203014685U (en) * | 2012-11-19 | 2013-06-19 | 苏州汇川技术有限公司 | Series connection type high-voltage frequency converter and pre-charging circuit |
| CN103647458A (en) * | 2013-12-24 | 2014-03-19 | 苏州汇川技术有限公司 | Frequency conversion system and method and device for precharging high-voltage frequency converter in frequency conversion system |
| CN209072333U (en) * | 2018-11-13 | 2019-07-05 | 上海中车汉格船舶与海洋工程有限公司 | A kind of pre-charge circuit and precharge frequency changing driving system |
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