CN111697812B - Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium - Google Patents
Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium Download PDFInfo
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- CN111697812B CN111697812B CN201910188538.2A CN201910188538A CN111697812B CN 111697812 B CN111697812 B CN 111697812B CN 201910188538 A CN201910188538 A CN 201910188538A CN 111697812 B CN111697812 B CN 111697812B
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a frequency conversion device, a control method and a control device of a Power Factor Correction (PFC) circuit of the frequency conversion device, and a storage medium, and belongs to the technical field of frequency conversion systems. The method comprises the following steps: acquiring a temporary direct current bus voltage value; and when the temporary direct current bus voltage value is larger than a first set voltage value, increasing the bandwidth of a voltage loop in the PFC circuit so as to accelerate the response speed of the PFC voltage loop and slow down the rise of the direct current bus voltage value. In the embodiment of the invention, when the voltage value of the direct current bus is greater than the first set voltage value, the frequency conversion equipment is judged to have the risk of triggering the system overvoltage protection shutdown, the PFC voltage loop response speed is increased by increasing the voltage loop bandwidth, the rise of the voltage value of the direct current bus is slowed down, the performance reduction caused by frequent shutdown of the frequency conversion equipment is avoided, and meanwhile, the frequency conversion equipment components are prevented from being damaged due to frequent power failure of a PFC circuit.
Description
Technical Field
The invention relates to the technical field of frequency conversion systems, in particular to frequency conversion equipment, a control method and a control device of a Power Factor Correction (PFC) circuit of the frequency conversion equipment, and a storage medium.
Background
During the operation of the frequency conversion equipment, for example: in order to meet the requirement of harmonic interference during the operation of the inverter air conditioner, the input ac current is generally corrected by a PFC circuit and a correction algorithm, so that the ac input current waveform tracks the ac input voltage to reduce the current harmonic. Meanwhile, the PFC circuit can also realize the voltage boost of the direct current bus and stabilize the voltage to a value far higher than the bus voltage peak value which can be obtained by natural rectification, so that the rotating speed range of the variable frequency compressor is effectively expanded, and favorable conditions are created for the stable operation of the compressor.
In the operation process of the variable frequency air conditioner, if the alternating current input voltage fluctuates abnormally, especially when the alternating current input voltage rises abnormally, the voltage of a direct current bus after the rear-stage rectification rises abnormally, and if the voltage of the direct current bus is also in a PFC (power factor correction) boost control state at the moment, the variable frequency air conditioner triggers the system to be shut down in overvoltage protection due to the fact that the voltage of the direct current bus rises quickly. When the variable frequency air conditioning system is in a high-frequency heavy-load operation state, the performance of the whole variable frequency air conditioning system is affected by overvoltage shutdown caused by abnormal rise of alternating-current input voltage. The method avoids the superposition of abnormal rising of the AC input voltage and abnormal rising of the DC bus voltage caused by PFC boost control, and the scheme disclosed by the prior art mainly comprises the following steps: and (3) detecting that the voltage of the direct current bus exceeds a certain set threshold value, directly stopping the PFC regulation function, and switching the variable frequency air conditioning system to a PFC-free running state. When the variable frequency air conditioning system is in a high-frequency heavy-load operation state, the existing one-knife control easily causes the direct current bus voltage under-voltage shutdown or the alternating current input current overcurrent shutdown, and the possibility of overcurrent damage of components of the rectifying circuit due to instantaneous rise of the alternating current input current exists.
Disclosure of Invention
The embodiment of the invention provides a frequency conversion device, a control method and a control device of a PFC circuit of the frequency conversion device, and a storage medium. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the embodiments of the present invention, there is provided a control method for a PFC circuit in a frequency conversion device, including:
acquiring a temporary direct current bus voltage value;
and when the temporary direct current bus voltage value is larger than a first set voltage value, increasing the bandwidth of a voltage loop in the PFC circuit so as to accelerate the response speed of the PFC voltage loop and slow down the rise of the direct current bus voltage value.
In some optional embodiments, before the increasing the bandwidth of the voltage loop in the PFC circuit, the method further includes:
acquiring a temporary voltage loop bandwidth;
and when the temporary voltage loop bandwidth is smaller than a bandwidth threshold value, executing the operation of increasing the voltage loop bandwidth in the PFC circuit.
In some optional embodiments, the method further comprises:
and when the voltage value of the temporary direct current bus is greater than a second set voltage value, controlling the PFC circuit to be powered off.
In some optional embodiments, the increasing the voltage loop bandwidth in the PFC circuit includes:
and increasing the bandwidth of a voltage loop in the PFC circuit according to the set step value.
In some optional embodiments, the method further comprises:
acquiring the current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
and if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and less than or equal to a second set voltage value, maintaining the voltage ring to operate at a bandwidth threshold value.
In some optional embodiments, the method further comprises:
acquiring the current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
and if the current direct current bus voltage value is greater than the temporary direct current bus voltage value and greater than a second set voltage value, controlling the PFC circuit to be powered off.
In some optional embodiments, the method further comprises:
acquiring the current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and greater than a second set voltage value, maintaining the voltage ring to operate for a set time length at a bandwidth threshold value;
obtaining the current direct current bus voltage value again;
and when the re-acquired current direct current bus voltage value is greater than a second set voltage value, controlling the PFC circuit to be powered off.
According to a second aspect of the embodiments of the present invention, there is provided a control apparatus for a PFC circuit in a frequency conversion device, including:
the acquisition unit is used for acquiring a temporary direct current bus voltage value;
and the control unit is used for increasing the bandwidth of a voltage loop in the PFC circuit when the voltage value of the temporary direct-current bus is greater than a first set voltage value so as to accelerate the response speed of the PFC voltage loop and slow down the rise of the voltage value of the direct-current bus.
In some optional embodiments, the obtaining unit is further configured to obtain a temporary voltage loop bandwidth before the control unit increases the voltage loop bandwidth in the PFC circuit;
the control unit is configured to perform the operation of increasing the voltage loop bandwidth in the PFC circuit when the temporary voltage loop bandwidth is smaller than a bandwidth threshold.
In some optional embodiments, the control unit is further configured to control the PFC circuit to power off when the temporary dc bus voltage value is greater than a second set voltage value.
In some optional embodiments, the control unit is configured to increase a voltage loop bandwidth in the PFC circuit according to the set step value.
In some optional embodiments, the obtaining unit is further configured to obtain a current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
and if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and less than or equal to a second set voltage value, maintaining the voltage ring to operate at a bandwidth threshold value.
In some optional embodiments, the obtaining unit is further configured to obtain a current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
the control unit is also used for controlling the PFC circuit to be powered off when the current direct current bus voltage value is greater than the temporary direct current bus voltage value and greater than a second set voltage value.
In some optional embodiments, the obtaining unit is further configured to obtain a current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
if the current direct-current bus voltage value is larger than the temporary direct-current bus voltage value and larger than a second set voltage value, maintaining the voltage ring to operate for a set time length at a bandwidth threshold value, and obtaining the current direct-current bus voltage value again;
and the control unit is also used for controlling the PFC circuit to be powered off when the re-acquired current direct current bus voltage value is greater than a second set voltage value.
According to a third aspect of the embodiments of the present invention, there is provided a frequency conversion apparatus, including a memory, a processor, and a program stored on the memory and executable by the processor, wherein the processor implements any one of the aforementioned control methods for a PFC circuit when executing the program.
According to a fourth aspect of embodiments of the present invention, there is provided a storage medium having stored thereon a computer program which, when executed by a processor, implements any of the aforementioned control methods for a PFC circuit.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
in the control process of a PFC circuit in frequency conversion equipment, the voltage loop bandwidth adjustment scheme in the PFC circuit is determined according to the voltage value of a direct current bus, when the voltage value of the direct current bus is larger than a first set voltage value, the frequency conversion equipment is judged to have the risk of triggering system overvoltage protection shutdown, the response speed of the PFC voltage loop is increased and the rise of the voltage value of the direct current bus is slowed down by increasing the voltage loop bandwidth, the performance reduction caused by frequent shutdown of the frequency conversion equipment is avoided, and meanwhile, the frequency conversion equipment components are prevented from being damaged by frequent power failure of the PFC circuit.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic flow diagram illustrating a control method for a PFC circuit in a frequency conversion device according to an exemplary embodiment;
fig. 2 is a flow chart illustrating a control method for a PFC circuit in a frequency conversion device according to an exemplary embodiment;
fig. 3 is a flow chart illustrating a control method for a PFC circuit in a frequency conversion device according to an exemplary embodiment;
fig. 4 is a schematic structural diagram illustrating a control apparatus for a PFC circuit in a frequency conversion device according to an exemplary embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
Fig. 1 shows a control method for a PFC circuit in a frequency conversion device according to an exemplary embodiment, including:
and step S101, acquiring a temporary direct current bus voltage value.
And step S102, when the temporary direct current bus voltage value is larger than a first set voltage value, increasing the bandwidth of a voltage loop in the PFC circuit so as to accelerate the response speed of the PFC voltage loop and slow down the rise of the direct current bus voltage value.
And the first set voltage value is smaller than the maximum direct current bus voltage value allowed by the frequency conversion equipment system. And when the temporary direct current bus voltage is less than or equal to the first set voltage value, the system normally operates. When the voltage value of the temporary direct current bus is larger than the first set voltage value, the frequency conversion equipment is judged to have the risk of triggering system overvoltage protection shutdown, an overvoltage processing state is switched to, and the operation of increasing the voltage loop bandwidth in the PFC circuit is executed.
In the control process of a PFC circuit in frequency conversion equipment, the voltage loop bandwidth adjustment scheme in the PFC circuit is determined according to the voltage value of a direct current bus, when the voltage value of the direct current bus is larger than a first set voltage value, the frequency conversion equipment is judged to have the risk of triggering system overvoltage protection shutdown, the response speed of the PFC voltage loop is increased and the rise of the voltage value of the direct current bus is slowed down by increasing the voltage loop bandwidth, the performance reduction caused by frequent shutdown of the frequency conversion equipment is avoided, and meanwhile, the frequency conversion equipment components are prevented from being damaged by frequent power failure of the PFC circuit.
Fig. 2 shows a control method for a PFC circuit in a frequency conversion device according to an exemplary embodiment, including:
in step S201, a temporary dc bus voltage value V0 is obtained.
When the temporary dc bus voltage value V0 is greater than the first set voltage value V1, step S202 is executed to obtain the current voltage loop bandwidth ω 0.
When the current voltage loop bandwidth ω 0 is smaller than the bandwidth threshold ω S, step S203 is executed to increase the voltage loop bandwidth in the PFC circuit.
In some optional embodiments, the method further comprises: and when the temporary direct current bus voltage value V0 is greater than a second set voltage value V2, controlling the PFC circuit to be powered off. The second set voltage value V2 is greater than the first set voltage value V1, and the second set voltage value V2 is equal to the maximum dc bus voltage value allowed by the system. When the temporary direct current bus voltage value V0 is greater than the second set voltage value V2, after the PFC circuit is controlled to be powered off, under the action of the rear-stage load of the PFC circuit, the direct current bus voltage is rapidly consumed and drops below the second set voltage value V2, so that the frequency conversion equipment is prevented from being shut down.
In the foregoing embodiments, there are various ways to increase the voltage loop bandwidth in the PFC circuit.
Optionally, the voltage loop bandwidth in the PFC circuit is increased to a set voltage loop bandwidth.
Optionally, the voltage loop bandwidth in the PFC circuit is increased according to the set step value. The current fluctuation caused by overlarge voltage loop bandwidth fluctuation is avoided.
In the normal rising and falling processes of the voltage of the direct current bus, the control stability of the alternating current is adversely affected due to the overlarge voltage loop bandwidth, and therefore, a voltage loop bandwidth threshold value can be set in a frequency conversion equipment system. In the process of increasing the bandwidth according to the set step value, the voltage loop bandwidth in the PFC circuit is smaller than or equal to the voltage loop bandwidth threshold and does not exceed the voltage loop bandwidth threshold.
In some optional embodiments, when the increasing of the voltage loop bandwidth in the PFC circuit is performed according to a set step value in the process of increasing the voltage loop bandwidth in the PFC circuit, as shown in fig. 3, the method further includes:
step S301, a current voltage loop bandwidth ω t is obtained.
When the current voltage loop bandwidth ω t is equal to the bandwidth threshold ω S, step S302 is executed to obtain the current dc bus voltage value Vt.
If the current dc bus voltage Vt is greater than the temporary dc bus voltage V0 and less than or equal to a second predetermined voltage V2, step S303 is performed to maintain the voltage ring operating at the bandwidth threshold.
In some alternative embodiments, as shown in fig. 3, when the current dc bus voltage Vt is greater than the second set voltage V2, step S304 is executed to control the PFC circuit to power off.
In step S304, after the PFC circuit is controlled to be powered off, the dc bus voltage is rapidly consumed and drops below the second set voltage value V2 under the action of the load at the post stage of the PFC circuit.
In some optional embodiments, the method further comprises:
acquiring a current voltage loop bandwidth ω t;
when the bandwidth ω t of the current voltage loop is equal to the bandwidth threshold ω s, acquiring a voltage value Vt of the current direct-current bus;
if the current direct-current bus voltage value Vt is greater than the temporary direct-current bus voltage value V0 and greater than a second set voltage value V2, maintaining the voltage ring to operate at a bandwidth threshold value omegas for a set time length;
reacquires
And when the re-acquired current direct current bus voltage value Vt is greater than a second set voltage value V2, controlling the PFC circuit to be powered off.
In order to avoid the inhibition of the PFC function to reduce the stability and the device safety of the system, when the voltage value of the DC bus is obtained to be larger than a second set voltage value V2 for the first time, the voltage ring is maintained to operate for a set time length by a bandwidth threshold value omega s, when the voltage value of the DC bus is reduced to the second set voltage value V2, the possibility of overvoltage shutdown of the system is reduced, and if the voltage value of the DC bus is reduced to the second set voltage value V2, the possibility of overvoltage shutdown of the system is reduced. If the voltage value of the direct current bus is still larger than the second set voltage value V2, the possibility of overvoltage shutdown of the system is improved, the PFC circuit is controlled to be powered off, and the direct current bus voltage is consumed by the rear-stage load.
In some optional embodiments, after controlling the PFC circuit to power off, the method further includes:
acquiring the current voltage value Vt of the direct current bus;
and when the current voltage value Vt of the direct current bus is smaller than or equal to a first set voltage value V1, adjusting the voltage loop bandwidth of the PFC circuit to the initial bandwidth, and controlling the PFC circuit to be electrified and operated.
When the PFC circuit is powered off, the rear-stage load consumes the DC bus voltage, the DC bus voltage is rapidly reduced, and when the DC bus voltage value is reduced to a first set voltage value V1 or below, the PFC circuit is controlled to be powered on to work.
The following is a device provided in an embodiment of the present invention, configured to execute the control method for the PFC circuit in the frequency conversion device provided in the foregoing embodiment.
As shown in fig. 4, a control apparatus for a PFC circuit in a frequency conversion device according to an exemplary embodiment includes: an acquisition unit 401 and a control unit 402.
The obtaining unit 401 is configured to obtain a temporary dc bus voltage value.
The control unit 402 is configured to, when the temporary dc bus voltage value is greater than a first set voltage value, increase a voltage loop bandwidth in the PFC circuit to increase a PFC voltage loop response speed and slow down an increase of the dc bus voltage value.
And the first set voltage value is smaller than the maximum direct current bus voltage value allowed by the frequency conversion equipment system. And when the temporary direct current bus voltage is less than or equal to the first set voltage value, the system normally operates. When the voltage value of the temporary direct current bus is larger than the first set voltage value, the frequency conversion equipment is judged to have the risk of triggering system overvoltage protection shutdown, an overvoltage processing state is switched to, and the operation of increasing the voltage loop bandwidth in the PFC circuit is executed.
In the control process of a PFC circuit in frequency conversion equipment, the voltage loop bandwidth adjustment scheme in the PFC circuit is determined according to the voltage value of a direct current bus, when the voltage value of the direct current bus is larger than a first set voltage value, the frequency conversion equipment is judged to have the risk of triggering system overvoltage protection shutdown, the response speed of the PFC voltage loop is increased and the rise of the voltage value of the direct current bus is slowed down by increasing the voltage loop bandwidth, the performance reduction caused by frequent shutdown of the frequency conversion equipment is avoided, and meanwhile, the frequency conversion equipment components are prevented from being damaged by frequent power failure of the PFC circuit.
In some optional embodiments, the obtaining unit 401 is further configured to obtain a temporary voltage loop bandwidth before the control unit 402 increases the voltage loop bandwidth in the PFC circuit;
the control unit 402 is configured to perform the operation of increasing the voltage loop bandwidth in the PFC circuit when the temporary voltage loop bandwidth is smaller than a bandwidth threshold.
In some optional embodiments, the control unit 402 is further configured to control the PFC circuit to power off when the temporary dc bus voltage value is greater than a second set voltage value. And the second set voltage value is greater than the first set voltage value and is equal to the maximum allowed direct-current bus voltage value of the system. When the temporary direct current bus voltage value is larger than the second set voltage value, after the PFC circuit is controlled to be powered off, under the action of a rear-stage load of the PFC circuit, the direct current bus voltage is rapidly consumed and drops below the second set voltage value, so that the frequency conversion equipment is prevented from being stopped.
In some optional embodiments, the control unit 402 is configured to increase a voltage loop bandwidth in the PFC circuit according to the set step value.
In some optional embodiments, the obtaining unit 401 is further configured to obtain a current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
and if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and less than or equal to a second set voltage value, maintaining the voltage ring to operate at a bandwidth threshold value.
In the foregoing embodiments, there are various ways to increase the voltage loop bandwidth in the PFC circuit.
Optionally, the voltage loop bandwidth in the PFC circuit is increased to a set voltage loop bandwidth.
Optionally, the voltage loop bandwidth in the PFC circuit is increased according to the set step value. The current fluctuation caused by overlarge voltage loop bandwidth fluctuation is avoided.
In the normal rising and falling processes of the voltage of the direct current bus, the control stability of the alternating current is adversely affected due to the overlarge voltage loop bandwidth, and therefore, a voltage loop bandwidth threshold value can be set in a frequency conversion equipment system. In the process of increasing the bandwidth according to the set step value, the voltage loop bandwidth in the PFC circuit is smaller than or equal to the voltage loop bandwidth threshold and does not exceed the voltage loop bandwidth threshold.
In some optional embodiments, the obtaining unit 401 is further configured to obtain a current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
the control unit 402 is further configured to control the PFC circuit to power off when the current dc bus voltage value is greater than the temporary dc bus voltage value and greater than a second set voltage value. After the PFC circuit is controlled to be powered off, the direct-current bus voltage is rapidly consumed and drops below a second set voltage value under the action of a rear-stage load of the PFC circuit.
In some optional embodiments, the obtaining unit 401 is further configured to obtain a current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
and if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and greater than a second set voltage value, maintaining the voltage ring to operate for a set time length at a bandwidth threshold value, and obtaining the current direct-current bus voltage value again.
The control unit 402 is further configured to control the PFC circuit to power off when the re-acquired current dc bus voltage value is greater than a second set voltage value.
The method comprises the steps that the voltage value of a direct current bus is obtained, the voltage value of the direct current bus is obtained, the voltage value is maintained, the voltage value is operated at a bandwidth threshold value for a set time length, when the voltage value of the direct current bus is reduced to a second set voltage value, the possibility of overvoltage shutdown of the system is reduced, and if the voltage value of the direct current bus is reduced to the second set voltage value, the possibility of overvoltage shutdown of the system is reduced. If the voltage value of the direct current bus is still larger than the second set voltage value, the possibility of overvoltage shutdown of the system is improved, the PFC circuit is controlled to be powered off, and the direct current bus voltage is consumed by the rear-stage load.
In some optional embodiments, the obtaining unit 401 is further configured to obtain the current dc bus voltage value after the control unit 402 controls the PFC circuit to power off.
And the control unit 402 is configured to adjust a voltage loop bandwidth of the PFC circuit to an initial bandwidth and control the PFC circuit to be powered on and operate when the current dc bus voltage value is less than or equal to a first set voltage value.
When the PFC circuit is powered off, the rear-stage load consumes the DC bus voltage, the DC bus voltage is rapidly reduced, and when the DC bus voltage value is reduced to a first set voltage value or below, the PFC circuit is controlled to be powered on to work.
In some optional embodiments, there is further provided a frequency conversion device, including a memory, a processor, and a program stored on the memory and executable by the processor, where the processor executes the program to implement the control method for the PFC circuit provided in any one of the foregoing embodiments.
In some optional embodiments, there is also provided a storage medium having stored thereon a computer program which, when executed by a processor, implements the control method for the PFC circuit provided by any of the preceding embodiments.
In an exemplary embodiment, a non-transitory computer readable storage medium comprising instructions, such as a memory comprising instructions, executable by a processor to perform the method described above is also provided. The non-transitory computer readable storage medium may be a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic tape, an optical storage device, and the like.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, it should be understood that the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
It should be understood that the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. The present invention is not limited to the procedures and structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (12)
1. A control method for a PFC circuit in a frequency conversion device is characterized by comprising the following steps:
acquiring a temporary direct current bus voltage value;
when the temporary direct current bus voltage value is larger than a first set voltage value, increasing the bandwidth of a voltage loop in the PFC circuit so as to accelerate the response speed of the PFC voltage loop and slow down the rise of the direct current bus voltage value;
acquiring the current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and greater than a second set voltage value, maintaining the voltage ring to operate for a set time length at a bandwidth threshold value;
obtaining the current direct current bus voltage value again;
and when the re-acquired current direct current bus voltage value is greater than a second set voltage value, controlling the PFC circuit to be powered off.
2. The method of claim 1, further comprising, prior to said increasing the voltage loop bandwidth in the PFC circuit:
acquiring a temporary voltage loop bandwidth;
and when the temporary voltage loop bandwidth is smaller than a bandwidth threshold value, executing the operation of increasing the voltage loop bandwidth in the PFC circuit.
3. The method of claim 1, further comprising:
and when the voltage value of the temporary direct current bus is greater than a second set voltage value, controlling the PFC circuit to be powered off.
4. The method of claim 1 or 2, wherein the increasing the voltage loop bandwidth in the PFC circuit comprises:
and increasing the bandwidth of a voltage loop in the PFC circuit according to the set step value.
5. The method of claim 4, further comprising:
acquiring the current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
and if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and less than or equal to a second set voltage value, maintaining the voltage ring to operate at a bandwidth threshold value.
6. A control device for a PFC circuit, comprising:
the acquisition unit is used for acquiring a temporary direct current bus voltage value;
the control unit is used for increasing the bandwidth of a voltage loop in the PFC circuit when the voltage value of the temporary direct-current bus is larger than a first set voltage value so as to accelerate the response speed of the PFC voltage loop and slow down the rise of the voltage value of the direct-current bus;
the acquisition unit is further used for acquiring the current voltage loop bandwidth; when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value; if the current direct-current bus voltage value is larger than the temporary direct-current bus voltage value and larger than a second set voltage value, maintaining the voltage ring to operate for a set time length at a bandwidth threshold value, and obtaining the current direct-current bus voltage value again;
and the control unit is also used for controlling the PFC circuit to be powered off when the re-acquired current direct current bus voltage value is greater than a second set voltage value.
7. The apparatus of claim 6, wherein the obtaining unit is further configured to obtain a temporary voltage loop bandwidth before the control unit increases the voltage loop bandwidth in the PFC circuit;
the control unit is configured to perform the operation of increasing the voltage loop bandwidth in the PFC circuit when the temporary voltage loop bandwidth is smaller than a bandwidth threshold.
8. The device of claim 6, wherein the control unit is further configured to control the PFC circuit to be powered off when the temporary DC bus voltage value is greater than a second set voltage value.
9. The apparatus of claim 6 or 7, wherein the control unit is configured to increase a voltage loop bandwidth in the PFC circuit according to the set step value.
10. The apparatus of claim 8, wherein the obtaining unit is further configured to obtain a current voltage loop bandwidth;
when the bandwidth of the current voltage loop is equal to a bandwidth threshold value, acquiring a current direct-current bus voltage value;
and if the current direct-current bus voltage value is greater than the temporary direct-current bus voltage value and less than or equal to a second set voltage value, maintaining the voltage ring to operate at a bandwidth threshold value.
11. A frequency conversion device comprising a memory, a processor and a program stored on the memory and executable by the processor, characterized in that the processor implements the control method for a PFC circuit according to any one of claims 1 to 5 when executing the program.
12. A storage medium having stored thereon a computer program, characterized in that the computer program realizes the control method for a PFC circuit according to any one of claims 1 to 5 when executed by a processor.
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| CN201910188538.2A CN111697812B (en) | 2019-03-13 | 2019-03-13 | Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium |
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| CN201910188538.2A CN111697812B (en) | 2019-03-13 | 2019-03-13 | Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium |
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| CN116334878B (en) * | 2023-05-24 | 2023-08-18 | 峰岹科技(深圳)股份有限公司 | Dynamic threshold control method and device for voltage ring, electronic equipment and storage medium |
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