CN109286326A - High-power frequency conversion extension circuit, control method and device and frequency conversion drive board - Google Patents
High-power frequency conversion extension circuit, control method and device and frequency conversion drive board Download PDFInfo
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- CN109286326A CN109286326A CN201811217753.2A CN201811217753A CN109286326A CN 109286326 A CN109286326 A CN 109286326A CN 201811217753 A CN201811217753 A CN 201811217753A CN 109286326 A CN109286326 A CN 109286326A
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- frequency conversion
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- contactor
- main contacts
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000004378 air conditioning Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
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
- H02M5/48—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 combination of static with dynamic converters; by combination of dynamo-electric with other dynamic or static converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Air Conditioning Control Device (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a high-power variable-frequency extension circuit, a control method, a control device, a variable-frequency drive plate and a variable-frequency compressor system. The high-power frequency conversion extension circuit comprises an alternating current contactor, one main contact of the alternating current contactor is connected with one main contact of a direct current relay of a frequency conversion drive plate in parallel, and the other main contact of the alternating current contactor is connected with the other main contact of the direct current relay in parallel; one main contact and the other main contact of the direct current relay are respectively connected in series with two direct current buses between a rectifier and an inverter of the variable frequency drive board. The invention solves the problem that the frequency conversion of a large commercial air conditioner is difficult to popularize due to overlarge direct current on the direct current bus of the frequency conversion drive board in the related technology, and improves the current capacity of the frequency conversion drive board.
Description
Technical field
The present invention relates to circuit fields, in particular to a kind of high-power frequency conversion expanded circuit, control method, device
With frequency conversion drive plate and frequency-changeable compressor system.
Background technique
With the improvement of people's environmental awareness, increasingly favoring energy-saving and environment-friendly product, air-conditioning is raw as people are improved
The product of comfort level living, not only enters huge numbers of families, also uses in various markets, mansion, and this large commercial air-conditioning
Become the energy consumption rich and influential family of this public place, the energy-saving and frequency-variable of this large commercial air-conditioning also becomes trend of the times.
Convertible frequency air-conditioner changes input voltage and the frequency of asynchronous machine by frequency conversion drive plate mainly to adjust its output work
Rate, to realize optimal, the most energy-saving run of air-conditioning.Frequency conversion drive plate mainly include rectifier, dc bus, inverter and
Control circuit, wherein for rectifier for converting alternating current to direct current, dc bus is straight for flat wave, energy storage and transmission
Galvanic electricity source, inverter is used to be converted in direct current the alternating current of certain frequency and voltage, and exports to the asynchronous electricity of compressor
Machine.
Fig. 1 is according to the electrical block diagram of the frequency conversion drive plate of the relevant technologies, as shown in Figure 1, in order to protect inversion
Device and compressor are provided with DC relay K on the dc bus between rectifier A and inverter B, straight for controlling
The on-off for flowing bus, works in the state of the system failure or under-voltage DC bus to avoid inverter and compressor.
The study found that if large commercial air-conditioning, using converter technique, the electric current on dc bus is very big.However,
Current onboard DC relay is since its current-carrying is small, pressure-resistant small, unbearable excessive DC current；And current-carrying capacity it is big after
Not only size is big for electric appliance, and cost is also very expensive.The frequency conversion that above-mentioned reason results in large commercial air-conditioning is difficult to popularize.
In conclusion big for causing in the related technology since the DC current on the dc bus of frequency conversion drive plate is excessive
The frequency conversion of type business air conditioner is difficult to universal problem, and currently no effective solution has been proposed.
Summary of the invention
The present invention provides a kind of high-power frequency conversion expanded circuit, control method, frequency conversion drive plate and frequency-changeable compressor systems
System, at least to solve to cause since the DC current on the dc bus of frequency conversion drive plate is excessive in the related technology large commercial empty
The frequency conversion of tune is difficult to universal problem.
In a first aspect, the embodiment of the invention provides a kind of high-power frequency conversion expanded circuit, the high-power frequency conversion extension
Circuit includes: A.C. contactor, wherein
One main contact parallel of the DC relay of a main contacts and frequency conversion drive plate for the A.C. contactor, institute
State another main contacts of A.C. contactor and another main contact parallel of the DC relay；
A main contacts and another main contacts for the DC relay is connected on the whole of the frequency conversion drive plate respectively
It flows on two DC bus between device and inverter.
Second aspect, the embodiment of the invention provides a kind of control methods of high-power frequency conversion expanded circuit, comprising:
Under the first predetermined condition, the main contacts for controlling the DC relay is attracted；
Under the second predetermined condition, the main contacts for controlling the A.C. contactor is attracted, wherein second predetermined condition
It include: that the main contacts of the DC relay is in attracting state, and the electric current on DC bus is greater than second predetermined value.
The third aspect, the embodiment of the invention provides a kind of control devices of high-power frequency conversion expanded circuit, comprising:
First controller, the main contacts under the first predetermined condition, controlling the DC relay are attracted；
Second controller, the main contacts under the second predetermined condition, controlling the A.C. contactor are attracted, wherein
Second predetermined condition includes: that the main contacts of the DC relay is in attracting state, and the electric current on DC bus is big
In second predetermined value.
Fourth aspect, the embodiment of the invention provides a kind of frequency conversion drive plate, the frequency conversion drive plate includes first aspect
The high-power frequency conversion expanded circuit.
5th aspect, the embodiment of the invention provides a kind of frequency-changeable compressor system, the frequency-changeable compressor system includes
High-power frequency conversion expanded circuit described in first aspect.
High-power frequency conversion expanded circuit, control method, device and the frequency conversion drive plate provided through the embodiment of the present invention with
And frequency-changeable compressor system, using the high-power frequency conversion expanded circuit including A.C. contactor, a master of the A.C. contactor
One main contact parallel of the DC relay of contact and frequency conversion drive plate, another main contacts and direct current of A.C. contactor after
Another main contact parallel of electric appliance；A main contacts and another main contacts for DC relay is connected on frequency conversion drive respectively
On two DC bus between the rectifier and inverter of plate, solve in the related technology since the direct current of frequency conversion drive plate is total
The excessive frequency conversion for leading to large commercial air-conditioning of DC current on line is difficult to universal problem, improves the electricity of frequency conversion drive plate
Current capacity.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the electrical block diagram according to the frequency conversion drive plate of the relevant technologies；
Fig. 2 is that the circuit structure of the frequency conversion drive plate according to an embodiment of the present invention comprising high-power frequency conversion expanded circuit shows
It is intended to；
Fig. 3 is the flow chart of the control method of high-power frequency conversion expanded circuit according to an embodiment of the present invention；
Fig. 4 is the structural block diagram of the control device of high-power frequency conversion expanded circuit according to an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of frequency-changeable compressor system according to an embodiment of the present invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that described herein, the specific embodiments are only for explaining the present invention, is not intended to limit the present invention.For ability
For field technique personnel, the present invention can be implemented in the case where not needing some details in these details.It is right below
The description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including element
There is also other identical elements in process, method, article or equipment.
A kind of high-power frequency conversion expanded circuit is provided in the present embodiment, and Fig. 2, which is according to an embodiment of the present invention, includes
The electrical block diagram of the frequency conversion drive plate of high-power frequency conversion expanded circuit, as shown in Fig. 2, high-power frequency conversion expanded circuit packet
It includes: a master of the DC relay K of a main contacts km1 and frequency conversion drive plate of A.C. contactor KM, A.C. contactor KM
Contact k1 is in parallel, and another main contacts k2 of another main contacts km2 and DC relay K of A.C. contactor KM is in parallel.
A main contacts k1 and another main contacts k2 of above-mentioned DC relay K is connected on frequency conversion drive plate respectively
On two DC bus between rectifier A and inverter B.What DC relay K was used to control DC bus connects on and off
It opens.
By above-mentioned high-power frequency conversion expanded circuit, in the main contacts of DC relay K and the master of A.C. contactor KM
In the case that contact is all connected, due to the main contacts of A.C. contactor KM and the main contact parallel of DC relay K, exchange
Contactor KM can shunt the DC current on DC relay K, to improve the DC current capacity of frequency conversion drive plate, solve
It has determined in the related technology due to the excessive frequency conversion for leading to large commercial air-conditioning of DC current on the dc bus of frequency conversion drive plate
Change is difficult to universal problem, is conducive to the frequency conversion of large commercial air-conditioning, also improves the versatility of frequency conversion drive plate.
Optionally, A.C. contactor KM in embodiments of the present invention can be the two poles of the earth A.C. contactor or two monopoles
A.C. contactor, wherein when using two unipolar alternate current contactors, the control side of the two unipolar alternate current contactors shares phase
Same control signal is played and the two poles of the earth A.C. contactor phase with realizing the main contacts common action of two unipolar alternate current contactors
Same control effect.
Optionally, the high-power frequency conversion expanded circuit of the embodiment of the present invention further includes controller S, and controller S can be answered
With the controller of frequency conversion drive plate.Control side of the controller S respectively with the control side of A.C. contactor KM, DC relay K connects
It connects, controller S is used to generate the first control signal of the control side of control A.C. contactor KM, and generates control direct current relay
The second control signal of the control side of device K.
Optionally, above-mentioned first control signal and second control signal can be identical control signal, be also possible to
Different control signals.
When using identical control signal, A.C. contactor KM and DC relay K common action, i.e., in direct current relay
When the main contacts of device K is attracted, the main contacts of A.C. contactor KM is also attracted；When the main contacts of DC relay K disconnects, exchange
The main contacts of contactor KM also disconnects.DC relay K and A.C. contactor KM, controlling party are controlled using identical control signal
Formula is simple, it is easy to accomplish.
When using different control signals, DC relay K and A.C. contactor KM are successively acted when being attracted.At this
In embodiment the present embodiment, DC relay K is attracted prior to A.C. contactor KM；In DC relay K and A.C. contactor KM
After being attracted, if system cut-off or system report failure, DC relay K and A.C. contactor KM are simultaneously switched off.Using upper
Different control signals is stated to control DC relay K and A.C. contactor KM, by taking frequency-conversion air-conditioning system as an example, works as convertible frequency air-conditioner
Refrigerating capacity it is smaller, i.e., when compressor horsepower is smaller, frequency conversion drive directly can be connected by the DC relay K of frequency conversion drive plate
DC current on the DC bus of plate, then inversion goes out to power to compressor；When the refrigerating capacity of air-conditioning is larger, i.e. compressor
When power is larger, the DC current on the DC bus of A.C. contactor shunting frequency conversion drive plate is reused, then inversion is gone out
It powers to compressor, to extend the current failure high-power frequency conversion of frequency conversion drive plate.
Optionally, the control that controller S is attracted for generating the main contacts of control DC relay K under the first predetermined condition
Signal processed.Wherein, the first predetermined condition includes but is not limited to: system does not report failure, and the voltage on DC bus is greater than first
Predetermined value.In the present embodiment, when system does not report the voltage in failure and DC bus to be greater than first predetermined value, just control is straight
The main contacts of current relay K is attracted, the purpose is to avoid compressor from running in the system failure or the under-voltage the case where
Lower operation, to ensure the safe operation of the other component in compressor and system.
According to actual needs, in the case where frequency-changeable compressor system external 220V alternating current, above-mentioned first predetermined value
It can be chosen for 256V.
Optionally, controller S, the main contacts for being also used to generate control A.C. contactor KM under the second predetermined condition are attracted
Control signal.Wherein, the second predetermined condition includes but is not limited to: the main contacts of DC relay K is in attracting state, and straight
The electric current flowed on bus is greater than second predetermined value.The master in DC relay K may be implemented by the second above-mentioned predetermined condition
Contact is attracted the control mode of the main contacts of A.C. contactor KM again after being attracted, second predetermined value therein is current straight for judging
Whether the electric current flowed on bus is excessive, if needs to enable A.C. contactor KM and carrys out shunt current.
According to actual needs, above-mentioned second predetermined value can be chosen for 30A.Experiments have shown that when second predetermined value is 30A
When on the one hand can ensure the operational safety of DC relay, and then the stable operation of safeguards system；On the other hand it can also mention
The efficiency of high system.
A kind of control method of high-power frequency conversion expanded circuit is additionally provided in the present embodiment, and Fig. 3 is according to the present invention
The flow chart of the control method of the high-power frequency conversion expanded circuit of embodiment, as shown in figure 3, the process includes the following steps:
Step S301, under the first predetermined condition, the main contacts for controlling DC relay is attracted；
Step S302, under the second predetermined condition, the main contacts for controlling A.C. contactor is attracted, wherein the second predetermined item
Part includes: that the main contacts of DC relay is in attracting state, and the electric current on DC bus is greater than second predetermined value.
Optionally, the first predetermined condition includes: that system does not report failure, and the voltage on DC bus is greater than first and makes a reservation for
Value.
Optionally, above-mentioned first predetermined value can be 256V, and above-mentioned second predetermined value can be 30A.
A kind of control device of high-power frequency conversion expanded circuit is additionally provided in embodiments of the present invention, which uses
In realization control method shown in Fig. 3.Fig. 4 is the control device of high-power frequency conversion expanded circuit according to an embodiment of the present invention
Structural block diagram, as shown in figure 4, the device includes:
First controller 41, couples with second controller, for controlling the master of DC relay under the first predetermined condition
Contact is attracted；
Second controller 42, the main contacts under the second predetermined condition, controlling A.C. contactor are attracted, wherein the
Two predetermined conditions include: that the main contacts of DC relay is in attracting state, and the electric current on DC bus is greater than second and makes a reservation for
Value.
Optionally, the first predetermined condition includes: that system does not report failure, and the voltage on DC bus is greater than first and makes a reservation for
Value.
A kind of frequency conversion drive plate is additionally provided in the present embodiment, which includes that above-mentioned high-power frequency conversion expands
Open up circuit.
A kind of frequency-changeable compressor system including above-mentioned high-power frequency conversion expanded circuit is additionally provided in the present embodiment,
Fig. 5 is the structural schematic diagram of frequency-changeable compressor system according to an embodiment of the present invention, as shown in figure 5, the frequency-changeable compressor system
It include: frequency conversion drive plate 1 and frequency-changeable compressor 2, wherein frequency conversion drive plate includes: rectifier A, inverter B, rectifier A and inverse
Become the DC bus and high-power frequency conversion expanded circuit between device B.
The high-power frequency conversion expanded circuit includes controller S, DC relay K and its main contacts k1 and k2, and exchange
Contactor KM and its main contacts km Ah and km2.
In the present embodiment, which can be controlled in conjunction with the method for Fig. 3.
It should be noted that diagrammatically illustrating DC relay and A.C. contactor on a DC bus in Fig. 5
Main contacts connection type, the main contacts of DC relay and A.C. contactor is also with same on another DC bus
Mode is attached, but is being not shown in the figure.
In conclusion through the embodiment of the present invention, being shunted using A.C. contactor, the DC bus of control frequency conversion drive plate
The DC current of upper rectification, and power after inversion to frequency-changeable compressor, it improves frequency conversion drive plate and passes through high current
Ability, while also improving the versatility of frequency conversion drive plate.High-power frequency conversion expander board provided in an embodiment of the present invention
Both the domestic variable frequency air-conditioning that can be applicable to low current is also applicable in the very big commercial Large-scale machine set of electric current.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of high-power frequency conversion expanded circuit, which is characterized in that the high-power frequency conversion expanded circuit includes: ac contactor
Device, wherein
One main contact parallel of the DC relay of a main contacts and frequency conversion drive plate for the A.C. contactor, the friendship
Flow another main contacts of contactor and another main contact parallel of the DC relay；
The main contacts and another main contacts of the DC relay are connected on the rectifier of the frequency conversion drive plate respectively
On two DC bus between inverter.
2. circuit according to claim 1, which is characterized in that the A.C. contactor is the two poles of the earth A.C. contactor or two
A unipolar alternate current contactor, the control side of described two unipolar alternate current contactors share identical control signal.
3. circuit according to claim 1, which is characterized in that the circuit further includes controller, the controller difference
It is connect with the control side of the control side of the A.C. contactor, the DC relay, the controller is for generating control institute
The first control signal of the control side of A.C. contactor is stated, and generates the second control for controlling the control side of the DC relay
Signal processed.
4. circuit according to claim 1, which is characterized in that the first control signal and the second control signal are
Identical control signal.
5. circuit according to claim 4, which is characterized in that the first control signal and the second control signal are
Different control signals.
6. circuit according to claim 5, which is characterized in that the controller, for being generated under the first predetermined condition
Control the control signal that the main contacts of the DC relay is attracted.
7. circuit according to claim 6, which is characterized in that first predetermined condition includes: that system does not report failure, and
Voltage on DC bus is greater than first predetermined value.
8. circuit according to claim 6, which is characterized in that the controller is also used to produce under the second predetermined condition
The control signal that the raw main contacts for controlling the A.C. contactor is attracted.
9. circuit according to claim 8, which is characterized in that second predetermined condition includes: the DC relay
Main contacts be in attracting state, and the electric current on DC bus is greater than second predetermined value.
10. the control method of high-power frequency conversion expanded circuit described in a kind of any one of claims 1 to 9, which is characterized in that
Include:
Under the first predetermined condition, the main contacts for controlling the DC relay is attracted；
Under the second predetermined condition, the main contacts for controlling the A.C. contactor is attracted, wherein the second predetermined condition packet
Include: the main contacts of the DC relay is in attracting state, and the electric current on DC bus is greater than second predetermined value.
11. according to the method described in claim 10, it is characterized in that, first predetermined condition includes: that system does not report failure,
And the voltage on DC bus is greater than first predetermined value.
12. the control device of high-power frequency conversion expanded circuit described in a kind of any one of claims 1 to 9, which is characterized in that
Include:
First controller, the main contacts under the first predetermined condition, controlling the DC relay are attracted；
Second controller is coupled to first controller, for controlling the A.C. contactor under the second predetermined condition
Main contacts is attracted, wherein second predetermined condition includes: that the main contacts of the DC relay be in attracting state, and directly
The electric current flowed on bus is greater than second predetermined value.
13. a kind of frequency conversion drive plate, which is characterized in that the frequency conversion drive plate includes described in any one of claims 1 to 9
High-power frequency conversion expanded circuit.
14. a kind of frequency-changeable compressor system, which is characterized in that the frequency-changeable compressor system includes any in claim 1 to 9
High-power frequency conversion expanded circuit described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811217753.2A CN109286326A (en) | 2018-10-18 | 2018-10-18 | High-power frequency conversion extension circuit, control method and device and frequency conversion drive board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811217753.2A CN109286326A (en) | 2018-10-18 | 2018-10-18 | High-power frequency conversion extension circuit, control method and device and frequency conversion drive board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109286326A true CN109286326A (en) | 2019-01-29 |
Family
ID=65177400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811217753.2A Pending CN109286326A (en) | 2018-10-18 | 2018-10-18 | High-power frequency conversion extension circuit, control method and device and frequency conversion drive board |
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| CN (1) | CN109286326A (en) |
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