CN208820711U - A kind of frequency converter - Google Patents
A kind of frequency converter Download PDFInfo
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- CN208820711U CN208820711U CN201821786138.9U CN201821786138U CN208820711U CN 208820711 U CN208820711 U CN 208820711U CN 201821786138 U CN201821786138 U CN 201821786138U CN 208820711 U CN208820711 U CN 208820711U
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- filtering
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Abstract
The utility model discloses a kind of frequency converters, it includes sequentially connected rectifying and wave-filtering voltage doubling unit, brake unit and inversion unit, the rectifying and wave-filtering voltage doubling unit includes that full-wave rectifying circuit and filter circuit interconnected are constituted, wherein, full-wave rectifying circuit is made of positive rectification circuit interconnected and negative sense rectification circuit, filter circuit is made of forward filtering circuit interconnected and negative sense filter circuit, the common node A of positive rectification circuit and negative sense rectification circuit is connect as the first input end of rectifying and wave-filtering voltage doubling unit with the L line at single-phase AC220V supply voltage end, the common node B of forward filtering circuit and negative sense filter circuit is connect as the second input terminal of rectifying and wave-filtering voltage doubling unit with the N line at single-phase AC220V supply voltage end.Frequency converter provided by the utility model, with boost function, so that three-phase AC380V asynchronous motor can also be driven under the power supply environment of single-phase AC220V.
Description
Technical field
The utility model relates to converter technology fields, and in particular to a kind of frequency converter of single-phase input three-phase output.
Background technique
Frequency converter is that power frequency supply (50Hz or 60Hz) is transformed into the AC power source of various frequencies, to realize electrical motor gearshift
The equipment of operation, mainly by rectify (AC to DC), filtering, inversion (direct current become exchange), brake unit, driving unit,
The composition such as detection unit microprocessing unit.The on-off of frequency converter IGBT close to the inner portion adjusts the voltage (V) and frequency of out-put supply
(F), supply voltage required for providing it according to the actual needs of motor, and then achieve the purpose that energy conservation, speed regulation.
Currently, existing frequency converter does not have boost function, when routine uses three-phase 380V asynchronous motor both at home and abroad, supply
Piezoelectric voltage is usually three-phase AC380V or so input, and the circuit structure of existing frequency converter is as shown in Fig. 1.In some no three-phases
When the occasion of AC380V power supply, three-phase AC380V asynchronous motor is not available, and whole equipment system is just unable to run, the day of one's doom
The three-phase AC380V processed applicable situation of asynchronous machine.
Utility model content
In order to overcome the deficiencies of the prior art and there are the problem of, the utility model provides a kind of frequency converter, which is
The frequency changer of single-phase input three-phase output, with boost function, so that can also under the power supply environment of single-phase AC220V
Drive three-phase AC380V asynchronous motor.
The utility model is achieved through the following technical solutions: a kind of frequency converter, and the frequency converter includes being sequentially connected
Rectifying and wave-filtering voltage doubling unit, brake unit and inversion unit, the rectifying and wave-filtering voltage doubling unit includes interconnected
Full-wave rectifying circuit and filter circuit are constituted, wherein full-wave rectifying circuit is whole by positive rectification circuit interconnected and negative sense
Current circuit composition, filter circuit is made of forward filtering circuit interconnected and negative sense filter circuit, positive rectification circuit and
First input end and single-phase AC220V supply voltage end of the common node A of negative sense rectification circuit as rectifying and wave-filtering voltage doubling unit
The connection of L line, the common node B of forward filtering circuit and negative sense filter circuit inputs as the second of rectifying and wave-filtering voltage doubling unit
End is connect with the N line at single-phase AC220V supply voltage end.
Further, buffer resistance R is connected in series between the positive rectification circuit and forward filtering circuit.It is preferred that
The both ends on ground, the buffer resistance R are connected in parallel to D.C. contactor SL.
Preferably, the positive rectification circuit connects group by three diodes in parallel in the same direction with negative sense rectification circuit
At, wherein the anode of three diodes in positive rectification circuit is connect with the common node A, in negative sense rectification circuit
The cathodes of three diodes connect with the common node A.
Preferably, the forward filtering circuit includes the first capacitor C1 being connected in parallel and equalizing resistance R1, the negative sense
Filter circuit includes the second capacitor C2 and equalizing resistance R2 being connected in parallel；Wherein, the cathode of first capacitor C1 and the second capacitor
Anode connect and form the common node B.
Frequency converter provided by the utility model is turned the voltage of input single-phase AC220V by rectifying and wave-filtering voltage doubling unit
It is changed to the voltage of DC620V, then is converted to the voltage of AC0-380V by inversion unit, so as to drive threephase asynchronous
Load equipment is driven, only single-phase AC220V power supply is efficiently solved and can also be driven under the occasion without three-phase AC380V power supply
The problem of AC380V asynchronous machine.
Detailed description of the invention
Fig. 1 is the electrical block diagram of frequency converter in the prior art.
Fig. 2 is the structural schematic diagram of frequency converter described in the utility model embodiment.
Fig. 3 is current direction structural schematic diagram of the frequency converter described in the utility model embodiment in positive half cycle.
Fig. 4 is current direction structural schematic diagram of the frequency converter described in the utility model embodiment in negative half period.
Wherein, drawing reference numeral are as follows: 11- full-bridge rectification unit, 12- filter unit, 13- brake unit, 14- inversion unit,
20- rectifying and wave-filtering voltage doubling unit.
Specific embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with the drawings and specific embodiments to the utility model make into
One step detailed description.
As shown in Fig. 1, which is frequency converter electricity when driving three-phase 380V asynchronous motor in the prior art
Line structure.In the circuit structure comprising full-bridge rectification unit 11, filter unit 12, brake unit 13 and inversion unit
14；The wherein external three-phase AC380V power supply of full-bridge rectification unit 11 exports the electricity of DC540V after the rectified filtering of AC380V power supply
Potential source exports after brake unit 13 and inversion unit 14 are handled and drives three-phase AC380V asynchronous for AC 0~380V voltage source
Motor.Frequency converter i.e. in the prior art only could drive three-phase in the occasion for being provided with three-phase AC380V power supply
AC380V asynchronous motor, and do not have three-phase AC380V power supply in practical applications, under many occasions, and generally it is provided with list
Phase AC220V.Therefore, frequency converter in the prior art limits the applicable situation of three-phase AC380V asynchronous machine significantly.
In view of deficiency existing for frequency converter in the prior art, so provide a kind of frequency converter as shown in Fig. 2
Circuit structure.In the utility model embodiment, the circuit structure of the frequency converter is as shown in Fig. 2 comprising sequentially connected
Rectifying and wave-filtering voltage doubling unit 20, brake unit 13 and inversion unit 14, the rectifying and wave-filtering voltage doubling unit include mutually to interconnect
The full-wave rectifying circuit and filter circuit connect is constituted, wherein full-wave rectifying circuit is by positive rectification circuit interconnected and bears
It is formed to rectification circuit, filter circuit is made of forward filtering circuit interconnected and negative sense filter circuit, positive rectified current
The common node A of road and negative sense rectification circuit is as the first input end of rectifying and wave-filtering voltage doubling unit and single-phase AC220V power supply electricity
The L line of pressure side connects, the common node B of forward filtering circuit and negative sense filter circuit as rectifying and wave-filtering voltage doubling unit second
Input terminal is connect with the N line at single-phase AC220V supply voltage end.
As preferred embodiment, buffer resistance is connected in series between the forward direction rectification circuit and forward filtering circuit
R；The both ends of the buffer resistance R are connected in parallel to D.C. contactor SL.Frequency converter power supply connect when, capacitor (first capacitor,
Second capacitor) in will flow through biggish charging current: CdU/dt (surge current) may burn out rectification circuit or inversion unit, because
This need to open buffer resistance R when frequency converter starts or stops.After capacitor has charged, charging current very little, buffering
The voltage at the both ends resistance R is very low, and the voltage at the both ends D.C. contactor SL can control D.C. contactor SL by normal at this time close to zero volt
It opens and becomes normally closed, buffer resistance R is shorted.
In a wherein preferred embodiment, the forward direction rectification circuit and negative sense rectification circuit are in the same direction by three
Diodes in parallel connection composition, wherein the anode of three diodes in positive rectification circuit connects with the common node A
It connects, the cathode of three in negative sense rectification circuit diode is connect with the common node A.In addition, the forward filtering electricity
Road includes the first capacitor C1 being connected in parallel and equalizing resistance R1, and the negative sense filter circuit includes the second capacitor being connected in parallel
C2 and equalizing resistance R2；Wherein, the cathode of first capacitor C1 connect with the anode of the second capacitor and forms the common node B.
Specifically, the positive rectification circuit is made of diode D1, D3, D5 in attached drawing 2；And the negative sense rectified current
Road is then made of diode D2, D4, D6 in attached drawing 2.Positive rectification circuit, negative sense rectification circuit, forward filtering circuit and
The particular circuit configurations of negative sense filter circuit are as shown in Fig. 2, and this will not be detailed here.In addition, the brake unit 13, inversion
Unit 14 belongs to the prior art, is not the improvement of the utility model, is no longer described in detail herein to its circuit structure.
Illustrate the working principle and the course of work of frequency converter provided in this embodiment briefly below: when positive half cycle, diode
D1, D3 and D5 conducting, and diode D2, D4 and D6 cut-off, first capacitor C1 are charged to Vm1, current path and capacitor
The polarity of C1 is as shown in Figure 3；When negative half period, diode D1, D3 and D5 cut-off, diode D2, D4 and D6 conducting, the second electricity
Hold C2 and be charged to Vm2, the polarity of current path and the second capacitor C2 are as shown in Figure 4.Due to first capacitor C1 and the second capacitor
C2 series connection, therefore DC voltage is exported, and Vm1=Vm2=Vm, wherein Vm is the voltage value at single-phase AC220V supply voltage end, electricity
The voltage held on C1 and C2 is 2*Vm, that is to say, that after the processing of rectifying and wave-filtering voltage doubling unit 20, single-phase AC220V power supply electricity
The voltage of pressure side doubles, i.e., the output voltage of rectifying and wave-filtering voltage doubling unit 20 is AC220V* √ 2*2 ≈ 620VDC.Rectification
The voltage signal for filtering the output of voltage doubling unit 20 is defeated using the alternating current for being converted to 0-380V by 14 inversion of inversion unit
Out, so as to drive threephase asynchronous to drive load equipment, so that frequency converter provided by the embodiment of the utility model
The work of single-phase input three-phase output driving threephase asynchronous.
Above-described embodiment is the preferable implementation of the utility model, is not the restriction to the utility model, not
Under the premise of the utility model design for being detached from the utility model, any obvious replacement is in the protection model of the utility model
Within enclosing.
Claims (5)
1. a kind of frequency converter, it is characterised in that: the frequency converter includes sequentially connected rectifying and wave-filtering voltage doubling unit, brake unit
And inversion unit, the rectifying and wave-filtering voltage doubling unit include that full-wave rectifying circuit and filter circuit interconnected are constituted,
Wherein, full-wave rectifying circuit is made of positive rectification circuit interconnected and negative sense rectification circuit, and filter circuit is by mutually interconnecting
Forward filtering circuit and negative sense the filter circuit composition connect, the common node A conduct of positive rectification circuit and negative sense rectification circuit
The first input end of rectifying and wave-filtering voltage doubling unit is connect with the L line at single-phase AC220V supply voltage end, forward filtering circuit and negative
To second input terminal and single-phase AC220V supply voltage end of the common node B as rectifying and wave-filtering voltage doubling unit of filter circuit
The connection of N line.
2. frequency converter according to claim 1, it is characterised in that: between the forward direction rectification circuit and forward filtering circuit
It is connected in series with buffer resistance R.
3. frequency converter according to claim 2, it is characterised in that: the both ends of the buffer resistance R are connected in parallel to direct current
Contactor SL.
4. frequency converter according to claim 1, it is characterised in that: it is described forward direction rectification circuit and negative sense rectification circuit by
Three diodes in parallel in the same direction connect composition, wherein the anode of three diodes in positive rectification circuit with the public affairs
The cathode of conode A connection, three diodes in negative sense rectification circuit is connect with the common node A.
5. frequency converter described according to claim 1~any one of 4, it is characterised in that: the forward filtering circuit includes
The first capacitor C1 and equalizing resistance R1 being connected in parallel, the negative sense filter circuit include the second capacitor C2 for being connected in parallel and
Piezoresistance R2；Wherein, the cathode of first capacitor C1 connect with the anode of the second capacitor and forms the common node B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821786138.9U CN208820711U (en) | 2018-10-31 | 2018-10-31 | A kind of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821786138.9U CN208820711U (en) | 2018-10-31 | 2018-10-31 | A kind of frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN208820711U true CN208820711U (en) | 2019-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821786138.9U Active CN208820711U (en) | 2018-10-31 | 2018-10-31 | A kind of frequency converter |
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| CN (1) | CN208820711U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194242A (en) * | 2018-10-31 | 2019-01-11 | 东莞易盟特电气设备有限公司 | A kind of frequency converter |
-
2018
- 2018-10-31 CN CN201821786138.9U patent/CN208820711U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194242A (en) * | 2018-10-31 | 2019-01-11 | 东莞易盟特电气设备有限公司 | A kind of frequency converter |
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