CN208241600U - A kind of doube bridge arm ac-dc-ac inverter circuit - Google Patents
A kind of doube bridge arm ac-dc-ac inverter circuit Download PDFInfo
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- CN208241600U CN208241600U CN201820796167.7U CN201820796167U CN208241600U CN 208241600 U CN208241600 U CN 208241600U CN 201820796167 U CN201820796167 U CN 201820796167U CN 208241600 U CN208241600 U CN 208241600U
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- 230000033228 biological regulation Effects 0.000 description 2
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Abstract
The utility model discloses a kind of doube bridge arm ac-dc-ac inverter circuits, the A phase of the three-phase alternating-current supply of the utility model passes through doube bridge arm ac-dc-ac inverter circuit and is connected with the U of three-phase AC asynchronous motor, the B phase of three-phase alternating-current supply passes through doube bridge arm ac-dc-ac inverter circuit and is connected with the V of three-phase AC asynchronous motor, and the C phase of three-phase alternating-current supply is connected with the W of three-phase AC asynchronous motor.It is under the topological structure, the C phase in the three-phase voltage of input is as a reference point, input voltage UAC、UBC, wherein voltage-phase differs 60 °, output voltage UU, UV, and wherein voltage-phase differs 120 °.Device for power switching used by the doube bridge arm ac-dc-ac inverter circuit of the utility model is less, this topological structure reduces the volume and weight of frequency converter, and it reduces costs, control method selects ambipolar Sine Wave Pulse Width Modulation that frequency changer circuit efficiency operation may be implemented.
Description
Technical field
The utility model belongs to AC and DC hybrid transmission system technical field, in particular to a kind of doube bridge arm ac-dc-ac inverter circuit.
Background technique
Currently, AC and DC hybrid transmission system is a kind of effective speed regulation device and technology for alternating current generator.It is common to hand over straight alternation
The major function of frequency circuit is that the three-phase alternating current of input is converted into direct current by the three-phase rectification bridge of frequency converter, in
Between part capacitor filtering, direct current is converted into alternating current by the three phase inverter bridge of frequency converter.
But the device for power switching that above-mentioned frequency changer circuit has the disadvantage that rectifier bridge and inverter bridge use is more, not only
So that frequency changer circuit volume and weight is huge, and the cost of frequency converter is got higher.Therefore, comprehensively consider the straight friendship of three intersections
The principle and defect of frequency changer circuit, to reduce the device for power switching in ac-dc-ac inverter circuit, the friendship using doube bridge arm is straight
AC-AC frequency changer circuit equally may be implemented to the efficient frequency control of motor, and high reliablity, small in size, at low cost.
Utility model content
To solve the problems, such as appeal, the utility model provides a kind of doube bridge arm ac-dc-ac inverter circuit.The utility model
Device for power switching used by doube bridge arm ac-dc-ac inverter circuit is less, this topological structure reduces the volume and again of frequency converter
Amount, and reduce costs, control method selects ambipolar Sine Wave Pulse Width Modulation that frequency changer circuit high efficiency work may be implemented
Make.
The utility model achieves the above object through the following technical schemes:
A kind of doube bridge arm ac-dc-ac inverter circuit, the A phase of three-phase alternating-current supply pass through doube bridge arm ac-dc-ac inverter circuit with
The U of three-phase AC asynchronous motor is connected, and the B phase of three-phase alternating-current supply is passed through doube bridge arm ac-dc-ac inverter circuit and intersected with three
The V of stream asynchronous motor is connected, and the C phase of three-phase alternating-current supply is connected with the W phase of three-phase AC asynchronous motor；
The doube bridge arm ac-dc-ac inverter circuit includes doube bridge arm rectifier bridge, capacitor C, doube bridge arm inverter bridge and control
Device；The leading-out terminal of doube bridge arm rectifier bridge is connected with the end of incoming cables of doube bridge arm inverter bridge by DC bus, and the capacitor C is simultaneously
It is associated on DC bus；The DC bus side at the both ends capacitor C is equipped with voltage sensor, and voltage sensor detects the electricity of DC bus
Signal is pressed, then collected voltage signal is converted into digital signal by A/D and feeds back to controller；
The controller is connect with doube bridge arm inverter bridge.
The doube bridge arm rectifier bridge is made of 4 diodes, and wherein diode VD1 and diode VD2 is constituted on one group
Lower bridge arm, diode VD3 and diode VD4 constitute another group of upper and lower bridge arm.
Doube bridge arm inverter bridge is made of the IGBT device for power switching of 4 freewheeling diodes in parallel, IGBT pipe V1 and IGBT
Pipe V2 constitutes one group of upper and lower bridge arm, and IGBT pipe V3 and IGBT pipe V4 constitute another group of upper and lower bridge arm；Four power switch tubes with
Controller connection.
The conductive angle of each bridge arm is 180 °, and two arm alternating conductives, each phase start conductive angle to same phase up and down
120 ° of difference.
The input terminal A phase of the doube bridge arm rectifier bridge, B phase are using the C phase of three-phase alternating current as reference point, two inputs electricity
Pressure is UAC、UBC, 60 ° of voltage-phase difference.
Two voltage U of the output end U phase of the doube bridge arm inverter bridge, V phaseU、UVAs output voltage, voltage-phase
120 ° of difference.
Compared with the existing technology, the utility model has following technical effect that
The utility model realizes pressure regulation, frequency modulation using doube bridge arm ac-dc-ac inverter circuit, by the C phase of three-phase alternating-current supply
It is connected with the W phase of three-phase AC asynchronous motor, and using the C phase of three-phase alternating current as reference point, is obtaining same rotary magnetic
When field, it is only necessary to 60 ° of phase phase difference of alternating current be provided to two phase winding of U, V of alternating current generator, therefore only needed to three
U, V two-phase of phase AC induction motor carry out frequency conversion voltage adjusting, a kind of doube bridge arm ac-dc-ac inverter electricity designed by the utility model
Road can reduce the use of device for power switching, while reaching using effect, also reduce cost.
Detailed description of the invention
Fig. 1 is a kind of doube bridge arm ac-dc-ac inverter circuit diagram；
Fig. 2 is the output voltage waveform of doube bridge arm ac-dc-ac inverter circuit rectifies bridge；
Fig. 3 is the DC bus-bar voltage waveform diagram after doube bridge arm frequency changer circuit DC bus shunt capacitance；
The output voltage waveform of Fig. 4 doube bridge arm ac-dc-ac inverter circuit inverter bridge；
The output voltage waveform of Fig. 5 doube bridge arm voltage source type inverter.
Specific embodiment
The technical solution of the utility model, but the protection scope of the utility model are described in further detail with reference to the accompanying drawing
It is not limited to as described below.
As shown in Figure 1, a kind of doube bridge arm ac-dc-ac inverter circuit of the utility model, including doube bridge arm rectifier bridge, capacitor C,
Doube bridge arm inverter bridge and controller；The A phase of three-phase alternating-current supply pass through doube bridge arm ac-dc-ac inverter circuit with it is phase asynchronous
The U of motor is connected, and the B phase of three-phase alternating-current supply passes through doube bridge arm ac-dc-ac inverter circuit and three-phase AC asynchronous motor
V be connected, the C phase of three-phase alternating-current supply is connected directly with the W phase of three-phase AC asynchronous motor.Doube bridge arm rectifier bridge
Using the C phase of three-phase alternating current as reference point, two input voltages are U for input terminal A phase, B phaseAC、UBC, 60 ° of phase phase difference；Doube bridge
The leading-out terminal of arm rectifier bridge is connect with the end of incoming cables of doube bridge arm inverter bridge by DC bus, and capacitor C is connected in parallel on DC bus；
Two voltage U of the output end U phase of doube bridge arm inverter bridge, V phaseU、UVAs output voltage, 120 ° of phase phase difference.
In overall structure, retain the rectifying part of common frequency changer circuit, middle section capacitor C, Converting Unit circuit
Structural topology.
Rectification circuit and inverter circuit use doube bridge arm configuration, the C phase of three-phase alternating-current supply with it is phase asynchronous electronic
The W phase of machine is connected, and the alternating voltage of power grid is converted to DC voltage by doube bridge arm uncontrollable rectifier bridge, then direct current is female
The voltage of line by doube bridge arm inverter bridge be converted to amplitude, frequency, phase-adjustable alternating voltage, similarly with ac-dc-ac inverter
Mode give asynchronous motor power supply, and carry out frequency control and control of soft etc..
As shown in Fig. 2, the input terminal A phase of doube bridge arm rectifier bridge, B phase be using the C phase of three-phase alternating current as reference point, UAC、UBC
As the input voltage of doube bridge arm rectifier bridge, 60 ° of phase phase difference.Work as UACVoltage > UBCWhen voltage, diode VD1 and VD4 conducting；
Work as UACVoltage < UBCWhen voltage, diode VD3 and diode VD2 conducting；Obtained DC voltage is by parallel with DC bus
Bulky capacitor, obtain compared with steady dc voltage.Here the big electricity among doube bridge arm rectification circuit and doube bridge arm inverter circuit
Hold, there is good filter action, when voltage alternating, due to the charge and discharge electro ultrafiltration of capacitor, the voltage at both ends cannot be mutated, just
It ensure that the steady of voltage.So-called bulky capacitor refers to the working principle due to existing frequency converter, and the effect of capacitor is filtering, motor
Power is bigger, and capacity is bigger, and common configuration is the capacitor of about 1KW power configuration 1000 microfarad, therefore thousands of microfarads
Capacitor configuration is the most basic option of frequency converter.
As shown in figure 3, being not increase capacitor, the output voltage pulsation of doube bridge arm rectifier bridge is big, rectifies by doube bridge arm
Part and bulky capacitor part, obtained DC voltage Ud, as shown in figure 4, mains ripple is small, by the voltage U on DC busdMake
For the input voltage of doube bridge arm inverter circuit.
Further, doube bridge arm inverter bridge by three-phase voltage type inverter circuit wherein two phase composition, using IGBT conduct
Switching device, the fundamental mode of doube bridge arm inverter circuit still use 180 ° of electrically conducting manners, and the conductive angle of each bridge arm is
180 °, two arm alternating conductives, each angle for mutually starting conduction differ 120 ° to same phase up and down.
The course of work of lower surface analysis doube bridge arm voltage source type inverter, as shown in figure 5, obtaining the output electricity of U, V two-phase
Press Uu、Uv:
For U phase, when IGBT pipe V1 conducting, UuVoltage be Ud, when IGBT pipe V2 conducting, UuVoltage be-
Ud。
For V phase, when IGBT pipe V3 conducting, UvVoltage be Ud, when IGBT pipe V4 conducting, UvVoltage be-
Ud。
A kind of control method of doube bridge arm ac-dc-ac inverter circuit is as follows:
Take ambipolar sinusoidal pulse width modulation, ambipolar sinusoidal pulse width modulation principle are as follows: modulated signal UrFor sine
Wave, carrier wave UcIn modulated signal UrHalf period in be positive and negative triangular wave, so, resulting PWM wave is also to have just
Have it is negative, in modulated signal UrA cycle in export PWM wave only have ± UdTwo kinds of level, without zero level.
For the inverter bridge in doube bridge arm ac-dc-ac inverter circuit, the PWM of U, V two-phase, which is controlled, shares a triangular carrier
Uc, the sinusoidal modulation signal U of U, V two-phaseru、Urv120 ° are successively differed, U, V two-phase IGBT pipe control law are identical, believe in modulation
Number UrWith carrier wave UcPoint of intersection control IGBT pipe V1, V2, V3, V4 on-off.
For U phase, work as Uru>UcWhen, to IGBT pipe V1 with Continuity signal, to IGBT pipe V2 with cut-off signals, at this moment
The voltage of U phase can be obtained.The driving signal of IGBT pipe V1 and IGBT pipe V2 be always it is complementary, when adding Continuity signal to IGBT pipe V1
When, it may be possible to V1 conducting, it is also possible to diode VD5 afterflow conducting in parallel；It, may when adding Continuity signal to IGBT pipe V2
It is V2 conducting, it is also possible to diode VD6 afterflow conducting in parallel.
For V phase, work as Urv>UcWhen, to IGBT pipe V3 with Continuity signal, to IGBT pipe V4 with cut-off signals, at this moment
The voltage of V phase can be obtained.The driving signal of IGBT pipe V3 and IGBT pipe V4 be always it is complementary, when adding Continuity signal to IGBT pipe V3
When, it may be possible to V3 conducting, it is also possible to diode VD7 afterflow conducting in parallel；It, may when adding Continuity signal to IGBT pipe V4
It is V4 conducting, it is also possible to diode VD8 afterflow conducting in parallel.
Further, although same phase up and down two bridge arms PWM drive signal be it is complementary, in practice in order to prevent
Upper and lower two IGBT pipe is straight-through and causes short circuit, and a bit of two IGBT up and down are stayed in the switching of upper and lower two IGBT pipe on-off
The dead time of pipe cut-off signals.
In short, a kind of doube bridge arm ac-dc-ac inverter circuit of the utility model, circuit will be rectified using common three phase full bridge
Two bridge arms of circuit are as rectifying part, using two bridge arms of common three-phase voltage type bridge inverter main circuit as inverting part
Point, middle section uses big electrolytic capacitor.The A phase of the three-phase alternating-current supply of the utility model passes through doube bridge arm ac-dc-ac inverter electricity
Road is connected with the U of three-phase AC asynchronous motor, and the B phase of three-phase alternating-current supply passes through doube bridge arm ac-dc-ac inverter circuit and three
The V of phase AC asynchronous motor is connected, and the C phase of three-phase alternating-current supply is connected with the W of three-phase AC asynchronous motor.This is opened up
It flutters under structure, the C phase in the three-phase voltage of input is as a reference point, input voltage UAC、UBC, wherein voltage-phase differs
60 °, output voltage UU, UV, wherein voltage-phase differs 120 °.The doube bridge arm ac-dc-ac inverter circuit of the utility model is adopted
Device for power switching is less, this topological structure reduces the volume and weight of frequency converter, and reduces costs, controlling party
Method selects ambipolar Sine Wave Pulse Width Modulation that frequency changer circuit efficiency operation may be implemented.
Although being described above in conjunction with specific embodiment of the attached drawing to the utility model, the utility model is not
It is confined to above-mentioned specific embodiment, above-mentioned specific embodiment is only schematical, directiveness, rather than is limited
Property.Those skilled in the art under the enlightenment of this specification, are protected in the claim for not departing from the utility model
In the case where the range of shield, a variety of forms can also be made, these belong to the column of the utility model protection.
Claims (6)
1. a kind of doube bridge arm ac-dc-ac inverter circuit, it is characterised in that: the A phase of three-phase alternating-current supply passes through doube bridge arm and hands over straight alternation
Frequency circuit is connected with the U of three-phase AC asynchronous motor, and the B phase of three-phase alternating-current supply passes through doube bridge arm ac-dc-ac inverter circuit
It is connected with the V of three-phase AC asynchronous motor, the C phase of three-phase alternating-current supply is connected with the W phase of three-phase AC asynchronous motor
It connects；
The doube bridge arm ac-dc-ac inverter circuit includes doube bridge arm rectifier bridge, capacitor C, doube bridge arm inverter bridge and controller；It is double
The leading-out terminal of bridge arm rectifier bridge is connected with the end of incoming cables of doube bridge arm inverter bridge by DC bus, and the capacitor C is connected in parallel on
On DC bus；The DC bus side at the both ends capacitor C is equipped with voltage sensor, and voltage sensor detects the voltage letter of DC bus
Number, then collected voltage signal is converted into digital signal by A/D and feeds back to controller；
The controller is connect with doube bridge arm inverter bridge.
2. a kind of doube bridge arm ac-dc-ac inverter circuit according to claim 1, it is characterised in that: the doube bridge arm rectification
Bridge is made of 4 diodes, and wherein diode VD1 and diode VD2 constitutes one group of upper and lower bridge arm, diode VD3 and diode
VD4 constitutes another group of upper and lower bridge arm.
3. a kind of doube bridge arm ac-dc-ac inverter circuit according to claim 1, it is characterised in that: doube bridge arm inverter bridge is by 4
The IGBT device for power switching of a parallel connection freewheeling diode is constituted, and IGBT pipe V1 and IGBT pipe V2 constitute one group of upper and lower bridge arm,
IGBT pipe V3 and IGBT pipe V4 constitutes another group of upper and lower bridge arm；Four power switch tubes are connect with controller.
4. a kind of doube bridge arm ac-dc-ac inverter circuit according to claim 3, it is characterised in that: the conduction angle of each bridge arm
Degree is 180 °, and two arm alternating conductives, each phase start conductive angle and differ 120 ° same phase up and down.
5. a kind of doube bridge arm ac-dc-ac inverter circuit according to claim 1, it is characterised in that: the doube bridge arm rectification
Using the C phase of three-phase alternating current as reference point, two input voltages are U for the input terminal A phase of bridge, B phaseAC、UBC, voltage-phase difference
60°。
6. a kind of doube bridge arm ac-dc-ac inverter circuit according to claim 1, it is characterised in that: the doube bridge arm inversion
Two voltage U of the output end U phase of bridge, V phaseU、UVAs output voltage, voltage-phase differs 120 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820796167.7U CN208241600U (en) | 2018-05-25 | 2018-05-25 | A kind of doube bridge arm ac-dc-ac inverter circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820796167.7U CN208241600U (en) | 2018-05-25 | 2018-05-25 | A kind of doube bridge arm ac-dc-ac inverter circuit |
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| CN208241600U true CN208241600U (en) | 2018-12-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512482A (en) * | 2018-05-25 | 2018-09-07 | 陕西科技大学 | A kind of doube bridge arm ac-dc-ac inverter circuit and its control method |
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- 2018-05-25 CN CN201820796167.7U patent/CN208241600U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512482A (en) * | 2018-05-25 | 2018-09-07 | 陕西科技大学 | A kind of doube bridge arm ac-dc-ac inverter circuit and its control method |
| CN108512482B (en) * | 2018-05-25 | 2023-09-29 | 陕西科技大学 | Double-bridge arm AC-DC-AC frequency conversion circuit and control method thereof |
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Granted publication date: 20181214 |