CN207504774U - Variable frequency drive and system - Google Patents
Variable frequency drive and system Download PDFInfo
- Publication number
- CN207504774U CN207504774U CN201721346916.8U CN201721346916U CN207504774U CN 207504774 U CN207504774 U CN 207504774U CN 201721346916 U CN201721346916 U CN 201721346916U CN 207504774 U CN207504774 U CN 207504774U
- Authority
- CN
- China
- Prior art keywords
- switch
- variable frequency
- storage units
- voltage stabilizing
- input terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model discloses a kind of variable frequency drive and systems, are related to power electronics field.The variable frequency drive includes rectifier, voltage stabilizing energy-storage units and inverter, wherein, the first input end of rectifier is connect by first switch with the first phase line input terminal, second input terminal is connect by second switch with the second phase line input terminal, third input terminal is connect with third phase line input terminal, the first end and second end of voltage stabilizing energy-storage units is connect respectively with the first output terminal and second output terminal of rectifier, the third end of voltage stabilizing energy-storage units is switched by third and is connect with zero line side, the first end and second end of the first input end of inverter and the second input terminal respectively with voltage stabilizing energy-storage units is connect, the output terminal of inverter loads for connecting.The utility model can be charged by bus capacitor of the zero firewire circuit to voltage stabilizing energy-storage units, reduce the charging voltage and charging current during charging so that the type selecting range of switch is wider.
Description
Technical field
The utility model is related to power electronics field more particularly to a kind of variable frequency drive and systems.
Background technology
Frequency changer direct current bus charging scheme at this stage, mostly using the method for adding relay directly on busbar major loop
It charges to bus capacitor.Inventor has found that the busbar voltage of the uncontrollable rectification of relevant programme three-phase can reach 540V or so, this is just
It is required that busbar relay has good voltage endurance capability, i.e., the busbar relay of high current need to be used, therefore, to busbar relay
It is more demanding.
Invention content
A technical problem to be solved in the utility model is a kind of variable frequency drive and system, when can reduce charging
Charging voltage and charging current so that switch type selecting range it is wider.
According to the utility model on the one hand, a kind of variable frequency drive is proposed, including：Rectifier, the first of rectifier are defeated
Enter end to connect with the first phase line input terminal by first switch, the second input terminal is connected by second switch and the second phase line input terminal
It connects, third input terminal is connect with third phase line input terminal；Voltage stabilizing energy-storage units, the first end and second end point of voltage stabilizing energy-storage units
It is not connect with the first output terminal and second output terminal of rectifier, the third end of voltage stabilizing energy-storage units is switched by third and zero curve
End connection, wherein, voltage stabilizing energy-storage units include at least one set of bus capacitor；Inverter, the first input end of inverter and
First end and second end of two input terminals respectively with voltage stabilizing energy-storage units is connect, and the output terminal of inverter loads for connecting.
Further, which further includes：First resistor device is connected in series with third switch.
Further, every group of bus capacitor includes:It is arranged between the first end of voltage stabilizing energy-storage units and third end
First capacitor；The second capacitor being arranged between the third end of voltage stabilizing energy-storage units and second end.
Further, voltage stabilizing energy-storage units further include：Resistor group, resistor group include：It is in parallel with the first capacitor
Second resistance device, the 3rd resistor device in parallel with the second capacitor.
Further, first switch and second switch are A.C. contactor.
Further, first switch and second switch are the A.C. contactor with short-circuit protection function.
Further, third switch is AC relay.
Further, in the case where bus capacitor charges, first switch and second switch disconnect, and third switch closes
It closes；In the case of bus capacitor charging complete, first switch and second switch are closed, and third switch disconnects.
Further, in the case where variable frequency drive is standby, first switch, second switch and third switch disconnect.
Further, the first end of voltage stabilizing energy-storage units is connect by reactor with the first output terminal of rectifier.
Another aspect according to the present utility model, it is also proposed that a kind of frequency changing driving system, including host computer and above-mentioned change
Frequency driving circuit；Wherein, host computer is used to that first switch, second switch and third to be controlled to switch on-off.
Compared with the relevant technologies, the variable frequency drive of the utility model, including rectifier, voltage stabilizing energy-storage units and inversion
Device, wherein, the first input end of rectifier is connect by first switch with the first phase line input terminal, and the second input terminal passes through second
Switch is connect with the second phase line input terminal, and third input terminal is connect with third phase line input terminal, the first end of voltage stabilizing energy-storage units
It is connect respectively with the first output terminal and second output terminal of rectifier with second end, the third end of voltage stabilizing energy-storage units passes through third
Switch connect with zero line side, wherein, voltage stabilizing energy-storage units include at least one set bus capacitor, the first input end of inverter with
First end and second end of second input terminal respectively with voltage stabilizing energy-storage units is connect, and the output terminal of inverter loads for connecting.
It can be charged by bus capacitor of the zero firewire circuit to voltage stabilizing energy-storage units, charging voltage and charging when reducing charging
Electric current so that the type selecting range of switch is wider.
By referring to the drawings to the detailed description of the exemplary embodiment of the utility model, the utility model it is other
Feature and its advantage will become apparent.
Description of the drawings
The attached drawing of a part for constitution instruction describes the embodiment of the utility model, and uses together with the description
In the principle for explaining the utility model.
With reference to attached drawing, according to following detailed description, the utility model can be more clearly understood, wherein：
Fig. 1 is the structure diagram of one embodiment of the utility model variable frequency drive.
Fig. 2 is the structure diagram of another embodiment of the utility model variable frequency drive.
Fig. 3 is the positive input charge circuit schematic diagram of the utility model variable frequency drive exchange.
Fig. 4 reversely inputs charge circuit schematic diagram for the exchange of the utility model variable frequency drive.
Fig. 5 is the structure diagram of one embodiment of the utility model frequency changing driving system.
Specific embodiment
The various exemplary embodiments of the utility model are described in detail now with reference to attached drawing.It should be noted that：It is unless another
It illustrates outside, the component and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments is unlimited
The scope of the utility model processed.
Simultaneously, it should be appreciated that for ease of description, the size of the various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
It is illustrative to the description only actually of at least one exemplary embodiment below, is never used as to this practicality
Novel and its application or any restrictions used.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
In shown here and discussion all examples, any occurrence should be construed as merely illustrative, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need to that it is further discussed.
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
With reference to attached drawing, the utility model is further described.
Fig. 1 is the structure diagram of one embodiment of the utility model variable frequency drive.The variable frequency drive packet
Include rectifier 1, voltage stabilizing energy-storage units 2 and inverter 3.
The rectifier 1 can be three-phase commutation bridge, and first input end is connected by 4 and first phase line input terminal of first switch
It connects, the second input terminal is connect by second switch 5 with the second phase line input terminal, and third input terminal connects with third phase line input terminal
Connect, wherein, the first phase line input terminal, the second phase line input terminal and third phase line input terminal can be respectively connected to firewire L1, L2,
L3.First switch 4 and second switch 5 can be A.C. contactor, be specifically as follows the ac contactor with short-circuit protection function
Device.
The first end and second end of voltage stabilizing energy-storage units 2 connects respectively with the first output terminal and second output terminal of rectifier 1
It connecing, third end is connect by third switch 6 with zero line side, wherein, third switch 6 is AC relay, and zero line side can access
Zero curve N.Voltage stabilizing energy-storage units 2 can include at least one set of bus capacitor, and every group of bus capacitor includes being arranged on voltage stabilizing storage
The first capacitor that can be between the first end of unit 2 and third end and third end and the second end for being arranged on voltage stabilizing energy-storage units 2
Between the second capacitor.
The first input end of inverter 3 and the second input terminal connect respectively with the first end and second end of voltage stabilizing energy-storage units 2
Connect, the output terminal of inverter 3 loads for connecting, the inverter 3 can by IPM (Intelligent Power Module,
Intelligent power module) it realizes.
In this embodiment, detect need to the charging of the bus capacitors of voltage stabilizing energy-storage units 2 when, first switch 4
It is disconnected with second switch 5, third switch 6 is closed, and is charged from L3-N single-phase alternating currents to bus capacitor, when bus capacitor is filled
After the completion of electricity, first switch 4 and second switch 5 disconnect, and third switch 6 is closed, and variable frequency drive can work normally at this time.
Due to charging by zero firewire circuit to bus capacitor, the charging voltage and charging current during charging are reduced so that switch
Type selecting range it is wider.
Fig. 2 is the structure diagram of another embodiment of the utility model variable frequency drive.
The first input end of three-phase commutation bridge 1 is connect by A.C. contactor 4 with the first phase line input terminal, the second input terminal
It is connect by A.C. contactor 5 with the second phase line input terminal, third input terminal is connect with third phase line input terminal.A.C. contactor
4 and A.C. contactor 5 can specifically select to be internally provided with electric current inspection according to the rated current type selecting of variable frequency drive
Survey the contactor with short-circuit protection function of device.
Voltage stabilizing energy-storage units 2 only show three groups of bus capacitors in Fig. 2, and every group of bus capacitor includes the first capacitor 21
With the second capacitor 22.It will be understood by those of skill in the art that multigroup bus capacitor can be set according to actual needs.The
One capacitor 21 is arranged between the first end of voltage stabilizing energy-storage units 2 and third end, and the second capacitor 22 is arranged on voltage stabilizing energy storage
Between the third end of unit 2 and second end, which can also include resistor group, which includes the
Two resistors 23 and 3rd resistor device 24, wherein, second resistance device 23 is in parallel with the first capacitor 21,3rd resistor device 24 and
Two capacitor 22 is in parallel.The resistance value of second resistance device 23 and 3rd resistor device 24 is equal in magnitude, enables to the first capacitor 21
It is equal with 22 voltage of the second capacitor, wherein, capacitor can be electrolytic capacitor, the perhaps other kinds of capacitance of thin-film electro.
Wherein, the first end of voltage stabilizing energy-storage units 2 can be connect by reactor 7 with 1 first output terminal of three-phase commutation bridge,
Second end is connect with the second output terminal of three-phase commutation bridge 1, and third end passes through AC relay 6, first resistor device 8 and zero line side
Connection.Wherein, according to charging current type selecting, first resistor device 8 is used to limit when bus capacitor charges AC relay 6
Charging current.
The first end and second end of 3 first input ends of IPM and the second input terminal respectively with voltage stabilizing energy-storage units 2 is connect,
The output terminal of IPM 3 loads for connecting, such as connection motor M.
In the case where bus capacitor charges, A.C. contactor 4 and A.C. contactor 5 disconnect, and AC relay 6 closes
It closes, charging current is through three-phase commutation bridge 1, reactor 7, the first capacitor 21 or the second capacitor 22, AC relay 6 and first
Resistor 8.Charging current is smaller at this time, and bus capacitor both end voltage is gradually increasing, and can prevent IPM from damaging.Wherein, Fig. 3
Middle dotted line inputs charge circuit current direction for exchange forward direction, and dotted line reversely inputs charge circuit current direction for exchange in Fig. 4.
After bus capacitor charging complete, AC relay 6 disconnects, and A.C. contactor 4 and A.C. contactor 5 are closed,
Operating current flows through A.C. contactor 4 and A.C. contactor 5 to IPM 3 and motor M, the entire normal work of variable frequency drive at this time
Make.
The relay used on DC circuit has the problem of being likely to occur very much arcing greatly, causes security risk and need not
The loss wanted, so often selecting solid-state relay, but solid-state relay cost is very high.In the case of same size, exchange
Relay is lower than DC relay calorific value smaller, cost.In this embodiment, since relay and contactor are all that string exists
In alternating current, it is thereby possible to select AC relay and A.C. contactor.In addition, the mother of the uncontrollable rectification of relevant programme three-phase
Line voltage can reach 540V or so, need to use powerful charging resistor.And the utility model by zero firewire circuit to busbar
Capacitor charges, and reduces the charging voltage and charging current during charging so that first resistor device and the type selecting range of relay
It is wider.
In the related art, when IPM does not work, operating voltage is still added in busbar both ends, this results in have
One part of current flows through equalizing resistance forming circuit, generates certain idling consumption.Even if cancelling equalizing resistance, due to electrolysis electricity
The presence of appearance causes busbar voltage that can not cut off, in addition, stand-by power consumption is equally inevitable caused by ripple current.
In the utility model detect variable frequency drive will enter it is standby in the case of, A.C. contactor 4, hand over
Stream contactor 5 and AC relay 6 disconnect, in bus capacitor remaining electricity via first resistor device and second resistance device by
It gradually discharges, busbar voltage is gradually reduced, and enters standby mode until IPM shuts down variable frequency drive, at this time variable frequency drive
In zero-power state.In this embodiment, the power supply of supply IPM can be really cut off by the charging modes of exchange side,
So that variable frequency drive is in Zero-power-consumption standby state.
In another embodiment, due to A.C. contactor 4,5 have short-circuit protection function, capacitance puncture,
IPM up and down bridge short circuit, there is foreign matter on the component damages such as short circuit or winding shorted to earth or circuit between machine winding and cause
Afterwards during terminal shortcircuit, A.C. contactor 4,5 detects will disconnect, and then power supply of cutting off the power when current value is more than protection value, play
Short-circuit protection acts on.Also, compared to short circuit protection measures such as protective tubes, A.C. contactor can repeatedly carry out short-circuit protection,
And response is more timely, and technical staff is facilitated to investigate failure.
Fig. 5 is the structure diagram of one embodiment of the utility model frequency changing driving system.The frequency changing driving system packet
Host computer 510 and variable frequency drive 520 are included, wherein, variable frequency drive 520 has carried out explaining in detail in the above-described embodiments
It states, is no longer expanded on further herein, host computer 510 is used to that first switch, second switch and third to be controlled to switch on-off.
For example, when charging to bus capacitor, host computer sends open command to first switch and second switch, to the
Three switches send close command.Wherein, first switch and second switch are A.C. contactor, are specifically as follows with short-circuit protection
The A.C. contactor of function, third switch are AC relay.If bus capacitor charging complete, host computer to first switch and
Second switch sends close command, is switched to third and sends open command.At this point, entire variable frequency drive normal work.If
Host computer judges that variable frequency drive needs to enter standby mode, then sends open command to first switch, second switch.This
When, third switch is also in off-state.
In this embodiment, bus capacitor is given to charge by zero firewire circuit, charging voltage when reducing charging and
Charging current, when inverter does not work, the power supply of cut-out supply inverter so that variable frequency drive is in Zero-power-consumption standby
State.
So far, the utility model is described in detail.In order to avoid covering the design of the utility model, this is not described
Some details well known to field.Those skilled in the art as described above, can be appreciated how to implement completely public here
The technical solution opened.
Although some specific embodiments of the utility model are described in detail by example, this field
It is to be understood by the skilled artisans that above example merely to illustrating rather than in order to limit the scope of the utility model.This
Field it is to be understood by the skilled artisans that can not depart from the scope of the utility model and spirit in the case of, to above example
It modifies.The scope of the utility model is defined by the following claims.
Claims (11)
1. a kind of variable frequency drive, which is characterized in that including：
Rectifier, the first input end of the rectifier are connect by first switch with the first phase line input terminal, the second input terminal
It is connect by second switch with the second phase line input terminal, third input terminal is connect with third phase line input terminal；
Voltage stabilizing energy-storage units, the first end and second ends of the voltage stabilizing energy-storage units respectively with the first output terminal of the rectifier
It being connected with second output terminal, the third end of the voltage stabilizing energy-storage units is switched by third to be connect with zero line side, wherein, it is described steady
Energy-storage units is pressed to include at least one set of bus capacitor；
Inverter, the first input end of the inverter and the second input terminal respectively with the first end of the voltage stabilizing energy-storage units and
Second end connects, and the output terminal of the inverter loads for connecting.
2. variable frequency drive according to claim 1, which is characterized in that further include：
First resistor device is connected in series with third switch.
3. variable frequency drive according to claim 1, which is characterized in that bus capacitor described in every group includes:
The first capacitor being arranged between the first end of the voltage stabilizing energy-storage units and third end；It is arranged on the voltage stabilizing energy storage
The second capacitor between the third end of unit and second end.
4. variable frequency drive according to claim 3, which is characterized in that the voltage stabilizing energy-storage units further include：
Resistor group, the resistor group include：The second resistance device in parallel with first capacitor, with second capacitance
The 3rd resistor device of device parallel connection.
5. variable frequency drive according to claim 1, which is characterized in that
The first switch and the second switch are A.C. contactor.
6. variable frequency drive according to claim 5, which is characterized in that
The first switch and the second switch are the A.C. contactor with short-circuit protection function.
7. variable frequency drive according to claim 1, which is characterized in that
The third switch is AC relay.
8. according to any variable frequency drives of claim 1-7, which is characterized in that
In the case where the bus capacitor charges, the first switch and the second switch disconnect, the third switch
It is closed；
In the case of the bus capacitor charging complete, the first switch and the second switch are closed, the third
Switch disconnects.
9. variable frequency drive according to claim 8, which is characterized in that
In the case where the variable frequency drive is standby, the first switch, the second switch and third switch are disconnected
It opens.
10. according to any variable frequency drives of claim 1-7, which is characterized in that the of the voltage stabilizing energy-storage units
One end is connect by reactor with first output terminal of rectifier.
11. a kind of frequency changing driving system, which is characterized in that including any frequency conversion drive of host computer and claim 1-10
Circuit；
Wherein, the host computer is used to that the first switch, second switch and third to be controlled to switch on-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721346916.8U CN207504774U (en) | 2017-10-19 | 2017-10-19 | Variable frequency drive and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721346916.8U CN207504774U (en) | 2017-10-19 | 2017-10-19 | Variable frequency drive and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207504774U true CN207504774U (en) | 2018-06-15 |
Family
ID=62500945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721346916.8U Active CN207504774U (en) | 2017-10-19 | 2017-10-19 | Variable frequency drive and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207504774U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707128A (en) * | 2017-10-19 | 2018-02-16 | 珠海格力电器股份有限公司 | Variable frequency drive, system and dc-link capacitance charging method |
| CN114301370A (en) * | 2021-12-31 | 2022-04-08 | 日立电梯（中国）有限公司 | Frequency converter |
-
2017
- 2017-10-19 CN CN201721346916.8U patent/CN207504774U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707128A (en) * | 2017-10-19 | 2018-02-16 | 珠海格力电器股份有限公司 | Variable frequency drive, system and dc-link capacitance charging method |
| CN114301370A (en) * | 2021-12-31 | 2022-04-08 | 日立电梯（中国）有限公司 | Frequency converter |
| CN114301370B (en) * | 2021-12-31 | 2024-05-24 | 日立电梯（中国）有限公司 | Frequency converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107707128A (en) | Variable frequency drive, system and dc-link capacitance charging method | |
| US9553533B2 (en) | DC pre charge circuit | |
| CN102939714B (en) | The method of voltage inverter and this inverter of control | |
| CN103269166A (en) | Frequency converter with pre-charging protection function | |
| US20110032652A1 (en) | Magnetic energy recovery switech having protective circuit | |
| CN104748288B (en) | Soft start charging circuit and its control method | |
| CN106655470B (en) | A kind of uninterruptible power supply and its control method | |
| CN110829575A (en) | Slow-start bus circuit, method and uninterruptible power supply | |
| CN113489046A (en) | Photovoltaic system, direct current combiner box and wiring error detection method | |
| CN108616155B (en) | Charging method and charging device | |
| CN207504774U (en) | Variable frequency drive and system | |
| CN211089218U (en) | High-capacity high-reliability rapid power supply switching device | |
| CN109119975A (en) | A kind of failure protection method of the breaker of direct current system and its start-up course | |
| CN115552755A (en) | Fault protection device | |
| CN106849327B (en) | Alternating current-direct current hybrid circuit breaker and control method | |
| CN106451500B (en) | Interphase load transfer terminal device based on transient waveform fitting | |
| CN105322773A (en) | Slow start circuit and operation method thereof | |
| CN102959670B (en) | Impulse current restraining device and control method thereof | |
| CN106451428A (en) | Hybrid type unified power quality conditioner with short circuiting current limiting function | |
| CN203671834U (en) | Soft start charging circuit | |
| CN102005778B (en) | Intelligent switch for series inverter equipment | |
| CN210201543U (en) | Charging circuit for improving reliability and photovoltaic air conditioning equipment | |
| Enomoto et al. | Continuous operation of wind power plants under pole-to-ground fault in an hvdc system consisting of half-bridge mmcs and disconnecting switches | |
| CN108808834B (en) | On-line uninterrupted power supply and control method thereof | |
| CN111900708A (en) | Soft switch solid-state power controller with current-limiting function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |