CN106992690A - Main circuit of frequency converter circuit - Google Patents
Main circuit of frequency converter circuit Download PDFInfo
- Publication number
- CN106992690A CN106992690A CN201710245198.3A CN201710245198A CN106992690A CN 106992690 A CN106992690 A CN 106992690A CN 201710245198 A CN201710245198 A CN 201710245198A CN 106992690 A CN106992690 A CN 106992690A
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- China
- Prior art keywords
- circuit
- unit
- current
- frequency converter
- contactor
- Prior art date
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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
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of main circuit of frequency converter circuit, it includes a current rectifying and wave filtering circuit and an inverter circuit, the current rectifying and wave filtering circuit includes a rectification unit, a current limiting unit and a filter unit, the current rectifying and wave filtering circuit is connected with the inverter circuit, wherein, the current limiting unit is attempted by after being connected with filter unit between the rectification unit and inverter circuit, and the direct current input side positive pole of the inverter circuit is connected to the node between the outlet side positive pole of rectification unit and current limiting unit；The current limiting unit includes a current-limiting resistance and a contactor, is connected after the current-limiting resistance is in parallel with the contactor with filter unit.Main circuit of frequency converter circuit of the present invention by the way that current limiting unit is connected with filter unit after it is in parallel with inverter circuit, during so that main loop circuit normally being run, high current on bus will not fluid contact device, avoid contact with device caloric value big, reduce temperature rise, the main loop circuit is simple in construction, while the requirement to contactor is relatively low.
Description
Technical field
The present invention relates to main loop circuit structure, more particularly to a kind of main circuit of frequency converter circuit.
Background technology
At present, general main circuit of frequency converter circuit includes the rectifying part being sequentially connected, DC filtering part, inverting part
Divide and control drive part.In order to which the charging current for preventing firm power turn-on moment filter capacitor excessive makes three-phase commutation bridge
Diode is damaged, and typically needs a pre-charge circuit in the direct current component of the main circuit of frequency converter circuit.In existing rectification
In filter circuit, when being charged to filter capacitor, to prevent big dash current from being caused damage to rectifier bridge, it is required in rectifier bridge
A current-limiting resistance current limliting is concatenated between electric capacity, and in current-limiting resistance two ends parallel contactor, in electric capacity via current limliting electricity
Hinder after charging complete, contactor normally opened contact closure completes pre-charge process so as to short circuit current-limiting resistance, it is ensured that main loop circuit
Normal operation.But, in the prior art, the direct current input side positive pole of inverter is connected between current-limiting resistance and filter capacitor
Node, so, in main loop circuit normal course of operation, due to contactor normally opened contact closure, electric current all by contact
Device so that contactor heating is serious, and even cabinet inside temperature can be also influenceed in small type, meanwhile, to the excessively stream of contactor
Performance has higher requirement.
In consideration of it, be necessary to provide it is a kind of solve drawbacks described above prevent contactor heating serious and low-temperature-rise change
Frequency device main loop circuit.
The content of the invention
Technical problems to be solved by the invention offer is a kind of to prevent contactor heating serious and low-temperature-rise frequency converter
Main loop circuit.
In order to solve the above technical problems, the present invention uses technical scheme as described below：A kind of main circuit of frequency converter circuit,
It includes a current rectifying and wave filtering circuit and an inverter circuit, the current rectifying and wave filtering circuit include a rectification unit, a current limiting unit and
One filter unit, the current limiting unit is in parallel with the inverter circuit after being connected with filter unit, wherein, the current limiting unit
One end is connected with one end of filter unit, and the other end of the current limiting unit is connected with the outlet side positive pole of the rectification unit, institute
State the other end of filter unit with the outlet side negative pole of rectification unit to be connected, the direct current input side positive pole connection of the inverter circuit
Node between the outlet side positive pole and current limiting unit of rectification unit, the direct current input side negative pole of the inverter circuit is connected to whole
Flow the node between the outlet side negative pole and filter unit of unit；The current limiting unit includes a current-limiting resistance and a contactor,
Connected after the current-limiting resistance is in parallel with the contactor with filter unit.
Its further technical scheme is：The filter unit includes the electrochemical capacitor of two series connection, the respectively first electrolysis electricity
Hold and the second electrochemical capacitor, wherein, the negative pole of first electrochemical capacitor is connected with the positive pole of the second electrochemical capacitor, and its positive pole leads to
Cross the current-limiting resistance with the outlet side positive pole of rectification unit to be connected, the negative pole of the second electrochemical capacitor is defeated with the rectification unit
Go out side negative pole to be connected.
Its further technical scheme is：The main circuit of frequency converter circuit also includes a brake unit, the brake unit
It is attempted by between the current rectifying and wave filtering circuit and inverter circuit.
Its further technical scheme is：The rectification unit is the three-phase commutation bridge being made up of six diodes.
Its further technical scheme is：The inverter circuit is the three-phase inverting circuit being made up of six switching tubes.Wherein,
The switching tube can be the switching devices such as IGBT switching tubes, GTR switching tubes, GTO IGCTs or MOS switch pipe.
The advantageous effects of the present invention are：Compared with prior art, main circuit of frequency converter circuit of the present invention is by inciting somebody to action
Current limiting unit is attempted by between rectification unit and inverter circuit after being connected with filter unit, the direct current input side positive pole of inverter circuit
It is connected to the node between the outlet side positive pole of rectification unit and current limiting unit so that main circuit of frequency converter normal operation circuit
When, the high current on bus does not flow through the contactor of current limiting unit, is normally transported in main loop circuit with improving the contactor
The problem of generating heat serious during row, so that the larger temperature rise that main loop circuit is brought because working long hours is reduced, and also reduction connects
The magnitude of current on tentaculum can reduce power consumption, so as to lift the efficiency of main loop circuit；The main loop circuit need not increase device, knot
Structure is simple, while the requirement to contactor conveyance capacity can be reduced.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of main circuit of frequency converter circuit of the present invention.
Embodiment
To make one of ordinary skill in the art be more clearly understood from the object, technical solutions and advantages of the present invention, with
Under the present invention is further elaborated in conjunction with the accompanying drawings and embodiments, similar reference numerals represent similar component in accompanying drawing.
Obviously, embodiment explained below is only a part of embodiment of the invention, rather than whole embodiments.Based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Reference picture 1, the invention provides a kind of main circuit of frequency converter circuit 10, it include a current rectifying and wave filtering circuit 100 and
One inverter circuit 200, the current rectifying and wave filtering circuit 100 includes a rectification unit 110, a current limiting unit 120 and a filter unit
130.The current limiting unit 120 is in parallel with the inverter circuit 200 after being connected with the filter unit 130, wherein, the current limliting
One end of unit 120 is connected with one end of filter unit 130, the other end of the current limiting unit 120 and the rectification unit 110
Outlet side positive pole is connected, and the other end of the filter unit 130 is connected with the outlet side negative pole of rectification unit 110, the inversion
The direct current input side positive pole of circuit 200 is connected to the node between the outlet side positive pole of rectification unit 110 and current limiting unit 120,
The direct current input side negative pole of the inverter circuit 200 is connected between the outlet side negative pole of rectification unit 110 and filter unit 130
Node；The current limiting unit 120 includes a current-limiting resistance R1 and contactor a RY1, the current-limiting resistance R1 and the contactor
Connected after RY1 is in parallel with filter unit 130.
Because the moment of firm power turn-on can cause a very big dash current, main loop circuit 10 is caused to damage,
Therefore, filter unit 130 concatenate a current limiting unit 120, current limiting unit 120 be provided with current-limiting resistance R1 can limiting circuit electricity
Stream, so that protection circuit.Again because only after current-limiting resistance R1 short circuits, inverter circuit 200 could start work, therefore, limit
Leakage resistance R1 is in parallel with a contactor RY1 short-circuit by current-limiting resistance R1 to realize, the normal work of main circuit of frequency converter circuit 10.And
It is attempted by between the rectification unit 110 and inverter circuit 200, can both protects after current limiting unit 120 is connected with filter unit 130
Protection circuit, again can the normal work of main loop circuit 10 and contactor RY1 normally opened contacts closure short circuit current-limiting resistance R1 when prevent
Largely or entirely electric current on bus flows through contactor RY1, greatly reduces contactor RY1 caloric values, eliminates major loop electricity
The larger temperature rise that road 10 is brought because working long hours, while requirement of the reduction to contactor RY1 conveyance capacities.
In some embodiments, such as the present embodiment, the filter unit 130 includes the electrochemical capacitor of two series connection, respectively
For the first electrochemical capacitor E1 and the second electrochemical capacitor E2, wherein, the negative pole and the second electrochemical capacitor of the first electrochemical capacitor E1
E2 positive pole is connected, and its positive pole is connected by the current-limiting resistance R1 with the outlet side positive pole of rectification unit 110, the second electrolysis electricity
The negative pole for holding E2 is connected with the outlet side negative pole of the rectification unit 110.Wherein, the major function of filter unit 130 is filter ordinary telegram
The voltage ripple on road, when the load, makes DC voltage steady.Because the power of inverter circuit 200 is larger, therefore filter unit
Using the electrochemical capacitor that capacity is larger in 130；Meanwhile, the first electrochemical capacitor E1 and the second electrochemical capacitor E2 is connected, it is possible to increase
The voltage endurance capability of electric capacity.
In some embodiments, such as the present embodiment, the main circuit of frequency converter circuit 10 also includes a brake unit
300, the brake unit 300 is attempted by between the current rectifying and wave filtering circuit 100 and inverter circuit 200.Wherein, the braking is single
Member 300 is one the 7th diode D7 and one the 7th IGBT FETs Q7 series circuit, the positive pole of the 7th diode D7
It is connected with the colelctor electrode C of the 7th IGBT FETs Q7, the direct current input side positive pole of its negative pole and the inverter circuit 200
It is connected, the emitter E of the 7th IGBT FETs Q7 is connected with the direct current input side negative pole of the inverter circuit 200.
Between the current rectifying and wave filtering circuit 100 and inverter circuit 200 and connecing a brake unit 300 can be such that frequency converter increases in moderating process
The braking moment of motivation is powered up, while absorbing the pumping voltage produced in braking procedure, makes the DC voltage of main loop circuit 10
It is unlikely to too high.
In some embodiments, such as the present embodiment, the rectification unit 110 is that the three-phase being made up of six diodes is whole
Flow bridge.
In some embodiments, such as the present embodiment, the inverter circuit 200 is the three-phase inversion being made up of six IGBT
Circuit.
Certainly, in other embodiments of the invention, constitute the inverter circuit 200 switching tube can for GTR switching tubes,
The switching device such as GTO IGCTs or MOS switch pipe.
In the other application of the present invention, in addition to frequency converter, UPS, servo-driver etc. have the electronics of main loop circuit
Device, its main loop circuit can use above-mentioned main circuit of frequency converter circuit 10 with protection circuit, while contactor RY1 is protected,
So as to reduce contactor RY1 caloric value, the temperature rise of electronic device is reduced.
Based on foregoing circuit design, the operation principle of main circuit of frequency converter circuit of the present invention is：When major loop is just upper electric, connect
Tentaculum RY1 normally opened contacts disconnect, now, and the rectified unit 110 of electric current flows to the current-limiting resistance R1 of current limiting unit 120, then via
The current-limiting resistance R1 carries out charging filtering to the first electrochemical capacitor E1 and the second electrochemical capacitor E2 of filter unit 130, to limit
Charging current value processed, while protection circuit；As the charging interval increases, charging current reduces, and main loop circuit 10 is precharged to
Busbar voltage reaches that steadily then, contactor RY1 normally opened contacts closure is short-circuit by current-limiting resistance R1, and circuit enters operation shape
State, is connected between rectification unit 110 and inverter circuit 200 after being connected due to current limiting unit 120 with filter unit 130, works as master
During 10 normal work of loop circuit, the high current on bus is not passed through contactor RY1, and only very small ripple current can be flowed through
Contactor RY1, therefore, substantially reduces contactor RY1 caloric value, so as to realize protection contactor RY1 effect.
In summary, after main circuit of frequency converter circuit disclosed by the invention is by the way that current limiting unit is connected with filter unit simultaneously
It is connected between rectification unit and inverter circuit, the direct current input side positive pole of the inverter circuit is connected to the outlet side of rectification unit
Node between positive pole and current limiting unit, to realize that, in main circuit of frequency converter circuit normal work, the high current on bus is not
Contactor RY1 is flowed through, so as to greatly reduce contactor RY1 caloric value, reduction main loop circuit is brought because working long hours
Larger temperature rise, the magnitude of current on reduction contactor so as to reduce power consumption, lifts the efficiency of main loop circuit；The main loop circuit
Device need not be increased, it is simple in construction, it is possible to decrease the requirement to contactor conveyance capacity；Brake unit is set to can absorb braking procedure
The pumping voltage of middle generation, makes the DC voltage of main loop circuit will not be too high.
The preferred embodiments of the present invention are the foregoing is only, rather than any formal limitation is done to the present invention.This area
Technical staff various equivalent changes and improvement, all institutes within the scope of the claims can be imposed on the basis of above-described embodiment
The equivalent variations done or modification, all should fall under the scope of the present invention.
Claims (5)
1. a kind of main circuit of frequency converter circuit, it includes a current rectifying and wave filtering circuit and an inverter circuit, the current rectifying and wave filtering circuit
Including a rectification unit, a current limiting unit and a filter unit, it is characterised in that：The current limiting unit and the filter unit string
It is in parallel with the inverter circuit after connection, wherein, one end of the current limiting unit is connected with one end of filter unit, the current limiting unit
The other end be connected with the outlet side positive pole of the rectification unit, the other end of the filter unit and the outlet side of rectification unit
Negative pole is connected, and the direct current input side positive pole of the inverter circuit is connected between the outlet side positive pole of rectification unit and current limiting unit
Node, the direct current input side negative pole of the inverter circuit is connected to the section between the outlet side negative pole of rectification unit and filter unit
Point；The current limiting unit includes a current-limiting resistance and a contactor, with filtering after the current-limiting resistance is in parallel with the contactor
Unit is connected.
2. main circuit of frequency converter circuit as claimed in claim 1, it is characterised in that：The filter unit includes the electricity of two series connection
Electric capacity, respectively the first electrochemical capacitor and the second electrochemical capacitor are solved, wherein, the negative pole of first electrochemical capacitor and the second electrolysis
The positive pole of electric capacity is connected, and its positive pole is connected by the current-limiting resistance with the outlet side positive pole of rectification unit, the second electrochemical capacitor
Negative pole be connected with the outlet side negative pole of the rectification unit.
3. main circuit of frequency converter circuit as claimed in claim 1, it is characterised in that：The main circuit of frequency converter circuit also includes
One brake unit, the brake unit is attempted by between the current rectifying and wave filtering circuit and inverter circuit.
4. main circuit of frequency converter circuit as claimed in claim 1, it is characterised in that：The rectification unit is by six diodes
The three-phase commutation bridge of composition.
5. main circuit of frequency converter circuit as claimed in claim 1, it is characterised in that：The inverter circuit is by six switching tubes
The three-phase inverting circuit of composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245198.3A CN106992690A (en) | 2017-04-14 | 2017-04-14 | Main circuit of frequency converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710245198.3A CN106992690A (en) | 2017-04-14 | 2017-04-14 | Main circuit of frequency converter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106992690A true CN106992690A (en) | 2017-07-28 |
Family
ID=59415087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710245198.3A Pending CN106992690A (en) | 2017-04-14 | 2017-04-14 | Main circuit of frequency converter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106992690A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149919A (en) * | 2018-09-27 | 2019-01-04 | 湖南沃森电气科技有限公司 | A kind of frequency converter of high reliability powers on buffer circuit |
| CN114167934A (en) * | 2021-12-08 | 2022-03-11 | 北京北航天宇长鹰无人机科技有限公司 | Filtering and voltage-stabilizing control circuit and system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0919154A (en) * | 1995-04-26 | 1997-01-17 | Sankyo Seiki Mfg Co Ltd | Rush current limiter for power supply |
| CN1332903A (en) * | 1998-12-28 | 2002-01-23 | 株式会社安川电机 | Inverter apparatus |
| CN101635519A (en) * | 2009-08-23 | 2010-01-27 | 山西科达自控工程技术有限公司 | Power unit with brake function for unit cascaded high-voltage frequency converter |
| CN101817471A (en) * | 2010-04-27 | 2010-09-01 | 天津大学 | Super capacitor energy-storage type elevator driver |
| CN103269166A (en) * | 2013-05-30 | 2013-08-28 | 广州市伟达力电器有限公司 | Frequency converter with pre-charging protection function |
| CN204119051U (en) * | 2014-07-22 | 2015-01-21 | 北京首聚能源科技发展有限公司 | A kind of low voltage frequency converter |
-
2017
- 2017-04-14 CN CN201710245198.3A patent/CN106992690A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0919154A (en) * | 1995-04-26 | 1997-01-17 | Sankyo Seiki Mfg Co Ltd | Rush current limiter for power supply |
| CN1332903A (en) * | 1998-12-28 | 2002-01-23 | 株式会社安川电机 | Inverter apparatus |
| CN101635519A (en) * | 2009-08-23 | 2010-01-27 | 山西科达自控工程技术有限公司 | Power unit with brake function for unit cascaded high-voltage frequency converter |
| CN101817471A (en) * | 2010-04-27 | 2010-09-01 | 天津大学 | Super capacitor energy-storage type elevator driver |
| CN103269166A (en) * | 2013-05-30 | 2013-08-28 | 广州市伟达力电器有限公司 | Frequency converter with pre-charging protection function |
| CN204119051U (en) * | 2014-07-22 | 2015-01-21 | 北京首聚能源科技发展有限公司 | A kind of low voltage frequency converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149919A (en) * | 2018-09-27 | 2019-01-04 | 湖南沃森电气科技有限公司 | A kind of frequency converter of high reliability powers on buffer circuit |
| CN114167934A (en) * | 2021-12-08 | 2022-03-11 | 北京北航天宇长鹰无人机科技有限公司 | Filtering and voltage-stabilizing control circuit and system |
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Application publication date: 20170728 |