CN206432915U - A kind of main circuit of energy feedback frequency converter - Google Patents
A kind of main circuit of energy feedback frequency converter Download PDFInfo
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- CN206432915U CN206432915U CN201621401941.7U CN201621401941U CN206432915U CN 206432915 U CN206432915 U CN 206432915U CN 201621401941 U CN201621401941 U CN 201621401941U CN 206432915 U CN206432915 U CN 206432915U
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Abstract
A kind of main circuit of energy feedback frequency converter, including rectification circuit, filter circuit and inverter circuit；The front end of rectification circuit is provided with input reactance device；Filter circuit is arranged between rectification circuit and inverter circuit, and filter circuit is composed in series by two electric capacity C1, C2；Two electric capacity C1, C2 of described filter circuit are parallel with equalizing resistance R3, R4 respectively；Contactor is provided between input reactance device and three-phase commutation bridge, two phase output terminals of input reactance device and the two-phase input of three-phase commutation bridge are connected with two groups of normally opened contacts of contactor respectively；Two groups of normally opened contacts of the contactor are parallel with pre-charge resistance respectively, and the electric power loop of the contactor is provided with electric-controlled switch.With simple in construction, with low cost, service life is long, and frequency converter indoor design is simple, the advantages of energy consumption is small.
Description
Technical field
The utility model is related to energy feedback frequency converter, says it is a kind of simple in construction, with low cost, service life in detail
Long, frequency converter indoor design is simple, the main circuit of the small energy feedback frequency converter of energy consumption.
Background technology
It is known that with scientific and technological development, the maturation of converter technology, frequency converter has turned into industrial production manufacture, smelting
The indispensable products of industry-by-industry such as gold, petrochemical industry and electric power, especially energy feedback frequency converter is widely used.
State Intellectual Property Office discloses entitled filed in a 30 days June in 2012：The energy of overall-in-one control schema is returned
Present frequency converter control method, Application No.：201210221587.X application for a patent for invention, it discloses a kind of cost it is low, fill
The small energy feedback main circuit of converter of device performance, frequency converter size is waved in distribution；Its concrete structure is as follows：Energy feedback frequency conversion
The main circuit structure of device includes rectification circuit, filter circuit and inverter circuit；Wherein rectification circuit is that the three-phase that IGBT is constituted is whole
Bridge is flowed, the front end of rectification circuit is provided with an input reactance device；Inverter circuit is the three phase inverter bridge that IGBT is constituted；Filter circuit
It is arranged between rectification circuit and inverter circuit, filter circuit is composed in series by two capacitance groups C1, C2, each capacitance group is
It is formed in parallel by one or more electrolytic capacitors.In the frequency converter course of work, if DC bus-bar voltage is less than set in advance
The three-phase alternating current of grid side is carried out rectification and obtains direct current by threshold value, rectification circuit, and inverter circuit obtains rectification circuit
Direct current carries out inversion and obtains alternating current supply motor, and motor is in dragging state；When motor, which is in, to slow down, what motor was produced
Energy is transferred on bus by inverter circuit, if now DC bus-bar voltage is higher than preset value, rectification circuit is by energy
Feed back to power network.
Because typically conventional electrochemical capacitor pressure voltage is DC voltage 450V, and three-phase alternating current supply voltage is exchanged
380V, after full-wave rectification, the peak value of DC voltage can reach 537V, and average value also has 513V；So, it is considered to capacity and filter
Ripple effect, filter circuit is typically all first by some electrochemical capacitors and to be unified into one group, and then two group capacitors are connected again；Due to
The capacity of each capacitor is not the same, especially electrochemical capacitor, and capacitance discreteness is big；After several parallel connections, two groups of electricity
Container capacity differs greatly；After series connection, the distribution of two group capacitor voltages is unbalanced, causes for two group capacitor life-spans inconsistent；Make
The service life for obtaining existing energy feedback frequency converter is short.
In use, it is also easy to produce when the contactor for being connected frequency converter with power supply is opened or closed high
Voltage, high pressure makes filter capacitor produce very big momentary charge electric current, and excessive electric current can burn out rectifier bridge diode.In order to gram
Drawbacks described above is taken, has file to disclose the precharge electricity for installing limitation pre-charge current on the dc bus of main circuit of converter
Resistance, it can bring very big influence to frequency converter indoor design, be unfavorable for layout designs, and circuit trace is complicated, and copper bar is longer, positive and negative
The distributed inductance increase of copper bar, and pre-charge resistance adds the energy consumption of frequency converter.
The content of the invention
The purpose of this utility model is to solve above-mentioned the deficiencies in the prior art there is provided one kind is simple in construction, with low cost, is made
With long lifespan, frequency converter indoor design is simple, the main circuit of the small energy feedback frequency converter of energy consumption.
The utility model solves the technical scheme that above-mentioned the deficiencies in the prior art are used：
A kind of main circuit of energy feedback frequency converter, including rectification circuit, filter circuit and inverter circuit；Wherein rectified current
Road is the three-phase commutation bridge that IGBT is constituted, and the front end of rectification circuit is provided with input reactance device；Inverter circuit is three that IGBT is constituted
Phase inverter bridge；Filter circuit is arranged between rectification circuit and inverter circuit, and filter circuit is by two electric capacity C1, C2 series connection groups
Into；It is characterized in that：Two electric capacity C1, C2 of described filter circuit are parallel with equalizing resistance R3, R4 respectively；Input reactance device
Be provided with contactor between three-phase commutation bridge, two phase output terminals of input reactance device and the two-phase input of three-phase commutation bridge respectively with
Two normally opened contacts of contactor are connected；Two normally opened contacts of the contactor are parallel with pre-charge resistance, the contactor
Electric power loop be provided with electric-controlled switch.
Heretofore described electric-controlled switch is relay.Two contacts of relay are serially connected on electric power loop.
Described electric capacity C1 and C2 are respectively the capacitance group being formed in parallel by least two electrolytic capacitors in the present invention.
Heretofore described input reactance device front end is provided with three electric capacity bridging between three-phase, described three electric capacity with
Input reactance device constitutes LC wave filters.Input reactance device can suppress surge voltage electric current, improve power factor, prevent harmonic wave from doing
Disturb, improve power grid quality, protect frequency converter, increase the service life.Three electric capacity can also improve power factor, especially three-phase electricity
When being connected to inductive load in road, the reduction of circuit active power can be made.Because there is phase difference between electric current and voltage, electric capacity is incorporated to
The phase difference of the two can largely be reduced afterwards, active power is improved.It is idle that capacitor can produce capacitive character, its phase with
Phase contrast 180 degree that inductive is idle, can cancel each other.
The rear end of heretofore described inverter circuit is provided with output reactance device.Output reactance device is first passed through, then connects equipment.
Output reactance device effectively suppresses the instantaneous pressure produced during the IGBT module switch of frequency converter, effectively weakens in output current
Higher harmonic component, reduces the noise of motor, reduces the device for power switching inside eddy-current loss, protection frequency converter, extension electricity
The service life of machine.
During work, the main circuit of the present invention is connected through contactor with AC power, contactor closing, on electric moment
When producing high pressure, pre-charge resistance limits the charging current of filter capacitor, protects rectifier bridge；It is precharged in alternating current
Resistance R1, R2, DC voltage is become by rectifier bridge, and after capacitor bank charging, after whole system is stable, master control borad is sent
Control signal, control relay adhesive is shorted out pre-charge resistance；And the main circuit of the present invention is conducive in frequency converter
The layout designs in portion, simplify circuit trace, shorten copper bar, reduce the distributed inductance of positive and negative copper bar, reduction loss.Due to filtering
Two electric capacity C1, C2 of circuit are parallel with resistance identical equalizing resistance R3, R4 respectively, and the resistance of resistance is typically all more smart
Standard, can make two electric capacity C1, C2 voltage distribution balanced, it is ensured that voltage equalizing, extend electric capacity use time, so as to extend energy
The service life of feedback frequency converter.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the present invention.
Embodiment
The main circuit of energy feedback frequency converter as shown in Figure 1, including rectification circuit 1, filter circuit 2 and inverter circuit 3；
Wherein rectification circuit is the three-phase commutation bridge that IGBT is constituted, and the front end of rectification circuit is provided with input reactance device 6, input reactance device 6
It is the three-phase input end in three-phase commutation bridge（Grid side）It is respectively equipped with inductor rectifier；Inverter circuit 3 is the three-phase that IGBT is constituted
Inverter bridge；Filter circuit 2 is arranged between rectification circuit 1 and inverter circuit 3, and filter circuit 2 is by two electric capacity C1, C2 series connection groups
Into；Described electric capacity C1 and C2 is respectively the capacitance group being formed in parallel by least two electrolytic capacitors.The features of the present invention exists
In：Two electric capacity C1, C2 of described filter circuit are parallel with resistance identical equalizing resistance R3, R4 respectively；Input reactance device 6
Contactor 7, two phase output terminals of input reactance device and the two-phase input difference of three-phase commutation bridge are provided between three-phase commutation bridge
It is connected with two groups of normally opened contacts of contactor 7；I.e.：Two groups of normally opened contacts of contactor 7 are serially connected in the of input reactance device respectively
Between one phase output terminal and the first phase input of three-phase commutation bridge and input reactance device the second phase output terminal and three-phase commutation bridge
The second phase input between.Specially：One end of first phase output terminal of input reactance device and one group of normally opened contact of contactor
It is connected, the other end of normally opened contact is connected with the first phase input of three-phase commutation bridge, the second phase output terminal of input reactance device
Be connected with one end of another group of normally opened contact of contactor, the second phase input of the other end of normally opened contact and three-phase commutation bridge
It is connected.Pre-charge resistance, the electric power loop and relay of the contactor are parallel with two groups of normally opened contacts of the contactor 7
Normally opened contact be connected.It can be seen that what the electric power loop of described contactor was connected with the normally opened contact of relay
Concrete structure is：One end of contactor coil is connected through electric-controlled switch with one in three phase mains, the other end and three phase mains
In another phase be connected；Described electric-controlled switch is relay 8, the electric power loop of contactor and the normally opened contact phase of relay
Even.
It is of the invention further to improve, the described front end of input reactance device 6（Input）Provided with three electricity bridged between three-phase
Hold, i.e.,：One end of first electric capacity in three electric capacity is connected with the first phase power line, one end of second electric capacity and the second phase
Power line is connected, one end of the 3rd electric capacity is connected with third phase power line, first electric capacity, second electric capacity and the 3rd electricity
The other end of appearance is connected.Three described electric capacity and input reactance device composition LC wave filters 5.Input reactance device can suppress surge electricity
Current voltage, improves power factor, prevents harmonic wave interference, improves power grid quality, protects frequency converter, increases the service life.Three electricity
Appearance can be also improved when being connected to inductive load in power factor, especially three-phase circuit, can make the reduction of circuit active power.Because
There is phase difference between electric current and voltage, the phase difference of the two can largely be reduced by being incorporated to after electric capacity, improve active power.
It is idle that capacitor can produce capacitive character, its phase and the idle phase contrast 180 degree of inductive, can cancel each other.
It is of the invention further to improve, the rear end of described inverter circuit（Output end）Provided with output reactance device 4.First pass through defeated
Go out reactor, then connect equipment；Output reactance device effectively suppresses the instantaneous pressure produced during the IGBT module switch of frequency converter, effectively
Ground weakens the higher harmonic component in output current, reduces the noise of motor, reduces inside eddy-current loss, protection frequency converter
Device for power switching, extends the service life of motor.
During work, by the main circuit of the present invention through contactor and AC power（Power network）Be connected, contactor close, on electricity
Moment produce high pressure when, pre-charge resistance limits the charging current of filter capacitor, protects rectifier bridge；In alternating current warp
Pre-charge resistance R1, R2, DC voltage is become by rectifier bridge, after capacitor bank charging, after whole system is stable, master control
Plate sends signal, and control relay adhesive is shorted out pre-charge resistance；And the main circuit of the present invention is conducive to frequency converter
Internal layout designs, simplify circuit trace, shorten copper bar, reduce the distributed inductance of positive and negative copper bar, reduction loss.Due to filter
Two electric capacity C1, C2 of wave circuit are parallel with resistance identical equalizing resistance R3, R4 respectively, and the resistance of resistance is typically more smart
Standard, can make two electric capacity C1, C2 voltage distribution balanced, it is ensured that voltage equalizing, extend electric capacity use time, so as to extend energy
The service life of feedback frequency converter.
Claims (5)
1. a kind of main circuit of energy feedback frequency converter, including rectification circuit, filter circuit and inverter circuit；Wherein rectification circuit
The three-phase commutation bridge constituted for IGBT, the front end of rectification circuit is provided with input reactance device；Inverter circuit is the three-phase that IGBT is constituted
Inverter bridge；Filter circuit is arranged between rectification circuit and inverter circuit, and filter circuit is composed in series by two electric capacity C1, C2；
It is characterized in that：Two electric capacity C1, C2 of described filter circuit are parallel with equalizing resistance R3, R4 respectively；Input reactance device with
Contactor is provided between three-phase commutation bridge, two phase output terminals of input reactance device and the two-phase input of three-phase commutation bridge are respectively with connecing
Two groups of normally opened contacts of tentaculum are connected；Two groups of normally opened contacts of the contactor are parallel with pre-charge resistance, the contact respectively
The electric power loop of device is provided with electric-controlled switch.
2. the main circuit of energy feedback frequency converter according to claim 1, it is characterised in that：Described electric-controlled switch be after
Electrical equipment.
3. the main circuit of energy feedback frequency converter according to claim 1 or 2, it is characterised in that：Described electric capacity C1 and
C2 is respectively the capacitance group being formed in parallel by least two electrolytic capacitors.
4. the main circuit of energy feedback frequency converter according to claim 3, it is characterised in that：Before described input reactance device
End is provided with three electric capacity bridged between three-phase, and three described electric capacity constitute LC wave filters with input reactance device.
5. the main circuit of energy feedback frequency converter according to claim 4, it is characterised in that：After described inverter circuit
End is provided with output reactance device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621401941.7U CN206432915U (en) | 2016-12-20 | 2016-12-20 | A kind of main circuit of energy feedback frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621401941.7U CN206432915U (en) | 2016-12-20 | 2016-12-20 | A kind of main circuit of energy feedback frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206432915U true CN206432915U (en) | 2017-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621401941.7U Expired - Fee Related CN206432915U (en) | 2016-12-20 | 2016-12-20 | A kind of main circuit of energy feedback frequency converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
| CN110829817A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Control circuit, control method and device of control circuit and air conditioner |
| CN110829818A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| CN110932566A (en) * | 2019-12-22 | 2020-03-27 | 山东省托威达电气有限公司 | Main circuit of constant-frequency voltage-stabilized power supply for ship and working method thereof |
| CN112350556A (en) * | 2020-11-16 | 2021-02-09 | 上海华电奉贤热电有限公司 | Harmonic suppression circuit of frequency converter |
-
2016
- 2016-12-20 CN CN201621401941.7U patent/CN206432915U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
| CN110022053B (en) * | 2019-03-29 | 2024-03-29 | 合肥华耀电子工业有限公司 | Three-phase rectification protection circuit with input surge current suppression function |
| CN110829817A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Control circuit, control method and device of control circuit and air conditioner |
| CN110829818A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| CN110932566A (en) * | 2019-12-22 | 2020-03-27 | 山东省托威达电气有限公司 | Main circuit of constant-frequency voltage-stabilized power supply for ship and working method thereof |
| CN112350556A (en) * | 2020-11-16 | 2021-02-09 | 上海华电奉贤热电有限公司 | Harmonic suppression circuit of frequency converter |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170822 Termination date: 20201220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |