CN112886794A - Control method and control device of high-power high-frequency switching power supply - Google Patents
Control method and control device of high-power high-frequency switching power supply Download PDFInfo
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- 238000005868 electrolysis reaction Methods 0.000 description 2
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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
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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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 control method and a control device of a high-power high-frequency switching power supply, wherein the high-power high-frequency switching power supply comprises a control module and power modules which are in communication connection with the control module and are connected in parallel, and the control method comprises the following steps: acquiring a control instruction; generating PWM control signals based on the control instructions, and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; and controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization. According to the arrangement, by using the same PWM control signal, each parallel power supply module in the high-power high-frequency switching power supply can be adjusted to be the same as the switching frequency and the pulse width of the control module, so that each parallel power supply module can work synchronously at the same switching frequency and the same pulse width, and can output current uniformly when stabilizing voltage.
Description
Technical Field
The invention relates to the technical field of high-power high-frequency switching power supplies, in particular to a control method and a control device of a high-power high-frequency switching power supply.
Background
The high-power high-frequency switching power supply is a direct-current power supply based on high frequency, large current and low voltage. The high-power high-frequency switching power supply on the market generally adopts a mode of connecting a plurality of power supply modules in parallel and is controlled through an intelligent network.
At present, in some industries such as electroplating, electrolysis, heating and the like, a high-power high-frequency switch power supply capable of performing voltage stabilization control is needed, but in the working process of the high-power high-frequency switch, all parallel power supply modules cannot completely accord with each other due to parameters, so that the high-power high-frequency switch is difficult to ensure that all modules can share load current uniformly, the problem of current imbalance is easily caused, the output current fluctuation is large, the reliability is low, and the market needs are difficult to meet.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide a control method and a control device for a high-power high-frequency switching power supply, in which it is difficult for a high-power high-frequency switching in the prior art to ensure that each module shares load current uniformly, thereby easily causing current imbalance.
In order to achieve the above object, an embodiment of the present invention provides a control method for a high-power high-frequency switching power supply, where the high-power high-frequency switching power supply includes a control module and power modules connected in parallel to each other and in communication with the control module, and the control method includes: acquiring a control instruction; generating PWM control signals based on the control instructions, and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; wherein the working parameters comprise switching frequency, pulse width and pulse starting point; and controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization.
Optionally, before the obtaining the control instruction, the method includes: acquiring a control signal of the power supply module, wherein the control signal is used for representing working parameters of the power supply module; and when the current working parameter of the power supply module is different from the preset working parameter, executing the step of obtaining the control instruction.
Optionally, the adjusting the current operating parameter of each power module to a preset operating parameter according to the PWM control signal includes: carrying out PID regulation on the control signal according to the PWM control signal; and adjusting the current pulse width of the power supply module to a preset pulse width through PID adjustment.
Optionally, the performing PID adjustment on the control signal according to the PWM control signal includes: acquiring a preset PWM signal according to the PWM control signal; and carrying out PID regulation on the preset PWM signal and the control signal.
Optionally, the performing PID adjustment on the preset PWM signal and the control signal includes: acquiring the pulse width voltage of the preset PWM signal and the pulse width voltage of the control signal according to the preset PWM signal and the control signal; and carrying out PID regulation on the pulse width voltage of the preset PWM signal and the pulse width voltage of the control signal.
The embodiment of the invention also provides a control device of the high-power high-frequency switching power supply, the high-power high-frequency switching power supply comprises a control module and power modules which are connected with the control module in parallel and communicated with each other, and the control device comprises: the first acquisition module is used for acquiring a control instruction; the first processing module is used for generating PWM control signals based on the control instructions and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; wherein the working parameters comprise switching frequency, pulse width and pulse starting point; and controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization.
Optionally, the control device comprises: the second acquisition module is used for acquiring a control signal of the power supply module, wherein the control signal is used for representing working parameters of the power supply module; and the second processing module is used for executing the step of acquiring the control instruction when the current working parameter of the power supply module is different from the preset working parameter.
Optionally, the first processing module includes: the control unit is used for carrying out PID adjustment on the control signal according to the PWM control signal; and the first adjusting unit is used for adjusting the current pulse width of the power supply module to a preset pulse width through PID adjustment.
Optionally, the control unit comprises: the acquisition unit is used for acquiring a preset PWM signal according to the PWM control signal; and the second regulating unit is used for carrying out PID regulation on the preset PWM signal and the control signal.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the control method described in any of the above embodiments.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the embodiment of the invention provides a control method of a high-power high-frequency switching power supply, wherein the high-power high-frequency switching power supply comprises a control module and power modules which are in communication connection with the control module and are connected in parallel, and the control method comprises the following steps: acquiring a control instruction; generating PWM control signals based on the control instructions, and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; wherein the working parameters comprise switching frequency, pulse width and pulse starting point; and controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization.
So set up, through using the same PWM control signal, can adjust each parallel power supply module in the high-power high frequency switching power supply to with control module's switching frequency the same, pulse width is the same and the same pulse initial point, make each parallel power supply module with the same switching frequency, the same pulse width, work in step, thereby each parallel power supply module can even output current when steady voltage, make output current balanced, it is undulant less, and then improved the reliability, market needs have been satisfied.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for a worker of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a control method of a high-power high-frequency switching power supply.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a worker skilled in the art without creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases by a worker of ordinary skill in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The high-power high-frequency switching power supply is a direct-current power supply based on high frequency, large current and low voltage. The high-power high-frequency switching power supply on the market generally adopts a mode of connecting a plurality of power supply modules in parallel and is controlled through an intelligent network. At present, in some industries such as electroplating, electrolysis, heating and the like, a high-power high-frequency switch power supply capable of performing voltage stabilization control is needed, but in the working process of the high-power high-frequency switch, all parallel power supply modules cannot completely accord with each other due to parameters, so that the high-power high-frequency switch is difficult to ensure that all modules can share load current uniformly, the problem of current imbalance is easily caused, the output current fluctuation is large, the reliability is low, and the market needs are difficult to meet.
Therefore, the technical problem to be solved by the present invention is to provide a control method and a control device for a high-power high-frequency switching power supply, in which it is difficult for a high-power high-frequency switching in the prior art to ensure that each module shares load current uniformly, thereby easily causing current imbalance.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a control method for a high-power high-frequency switching power supply, where the high-power high-frequency switching power supply includes a control module and power modules connected in parallel to each other and in communication with the control module, and the control method includes:
s1, acquiring a control instruction;
in the working process of the high-power high-frequency switching power supply, when the current output by the high-power high-frequency switching power supply is found to be non-uniform and has larger fluctuation, the high-power high-frequency switching power supply can automatically generate a control instruction according to the acquired output current. And each power supply module of the high-power high-frequency switching power supply can be adjusted through a control instruction.
Of course, the control instructions may also be generated by an external controller. For example, in the working process of the high-power high-frequency switching power supply, when a worker finds that the current output by the high-power high-frequency switching power supply is not uniform and the fluctuation is large, the worker presses a designated button on the controller, so that a control instruction can be manually generated.
Of course, the present embodiment is merely an example, and is not limited thereto, and a person skilled in the art may change the generation manner or the input manner of the control command according to the actual situation, and may achieve the same technical effect.
S2, generating PWM control signals based on the control instructions, and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; wherein the working parameters comprise switching frequency, pulse width and pulse starting point; and controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization.
After the control module receives the control instruction, a PWM control signal is automatically generated, and the PWM control signal can control each power supply module to adjust the current switching frequency of the power supply module. Working parameters are preset in the control module, wherein the working parameters comprise switching frequency, pulse width and a pulse starting point. The preset switching frequency in the working parameters is larger than the current switching frequency of the power module. And each power supply module is controlled by the PWM control signal, so that each power supply module outputs signals with the same frequency, the same pulse width and the same synchronization.
Because the switching frequencies of the power modules are not the same, in order to ensure that the switching frequencies of the power modules are the same, the switching frequencies of the power modules can only be maintained at a higher switching frequency, i.e., a preset switching frequency.
By means of the arrangement, each parallel power supply module in the high-power high-frequency switching power supply can be adjusted to the pulse starting point which is the same as the switching frequency, the pulse width and the pulse starting point of the control module by using the same PWM control signal, so that each parallel power supply module can work synchronously at the same switching frequency and the same pulse width. For example, for the switching frequency, the switching frequency of each parallel power supply module in the high-power high-frequency switching power supply can be adjusted to be the same as the preset switching frequency of the control module, so that each parallel power supply module works at the same switching frequency, each parallel power supply module can uniformly output current when stabilizing the voltage, the output current is balanced, the fluctuation is small, the reliability is further improved, and the market requirement is met.
Optionally, in some embodiments of the present invention, before step S1, the method includes:
s3, acquiring a control signal of the power supply module, wherein the control signal is used for representing working parameters of the power supply module;
each power module has a respective control signal that is used to characterize an operating parameter of the power module. The control signal may be a PWM signal.
Of course, the present embodiment is only an example of the control signal of the power module, and is not limited thereto, and a person skilled in the art may change the type of the control signal according to actual situations, so as to achieve the same technical effect.
And S4, when the current working parameter of the power supply module is different from the preset working parameter, executing the step of acquiring the control instruction.
Judging whether the current working parameters of the power supply module are the same as the preset working parameters or not; when the state is the same, the operation is continued;
when the current working parameters of the power module are different from the preset working parameters, the current output by the high-power high-frequency switching power supply is not uniform, and when the fluctuation is large, the high-power high-frequency switching power supply can automatically generate a control instruction according to the obtained output current. And each power supply module of the high-power high-frequency switching power supply can be adjusted through a control instruction.
Optionally, in some embodiments of the invention, step S2 includes:
s5, carrying out PID adjustment on the control signal according to the PWM control signal;
after the control module receives the control instruction, a PWM control signal is automatically generated, and the PWM control signal can control each power supply module to adjust the current pulse width of the power supply module. Because the current pulse widths of the power supply modules are not the same, in order to ensure that the current pulse widths of the power supply modules are the same, PID adjustment can be performed on the control signals of the power supply modules.
Of course, the present embodiment is only an example of the adjusting method, the adjusting step of the specific PID is not limited, and a person skilled in the art may change the type of the control signal according to the actual situation, so as to achieve the same technical effect.
And S6, adjusting the current pulse width of the power supply module to a preset pulse width through PID adjustment.
After the PID adjustment is performed, the control module can adjust the current pulse widths of all the power supply modules to the preset pulse width through the PID adjustment.
According to the arrangement, the pulse width of each parallel power supply module in the high-power high-frequency switching power supply can be adjusted to be the same as the preset pulse width of the control module, so that each parallel power supply module works with the same pulse width, each parallel power supply module can uniformly output current when the voltage is stabilized, the output current is balanced, the fluctuation is small, the reliability is improved, and the market requirement is met.
Optionally, in some embodiments of the invention, step S5 includes:
s7, acquiring a preset PWM signal according to the PWM control signal;
in the present embodiment, the type of the control signal is a PWM signal, so a PWM signal preset in the PWM control signal can be obtained from the PWM control signal. The PWM signal of the control module and the PWM signal of the control signal can be represented by the voltage pulse width, so that the overall output current of the high-power high-frequency switching power supply is indirectly regulated by regulating the voltage.
And S8, carrying out PID adjustment on the preset PWM signal and the control signal.
The PWM signal of the control module is compared with the PWM signal of the control signal, for example, by pulse width and then regulated by a PID regulation method.
Specifically, step S8 includes:
s9, acquiring the pulse width voltage of the preset PWM signal and the pulse width voltage of the control signal according to the preset PWM signal and the control signal;
and S10, carrying out PID regulation on the pulse width voltage of the preset PWM signal and the pulse width voltage of the control signal.
And acquiring the pulse width voltage of the preset PWM signal and the pulse width voltage of the control signal according to the preset PWM signal and the control signal, and performing PID (proportion integration differentiation) adjustment on the pulse width voltage of the preset PWM signal and the pulse width voltage of the control signal. Therefore, the pulse width voltage can be synchronously adjusted, and the overall output current of the high-power high-frequency switching power supply can be indirectly adjusted by adjusting the voltage.
Example 2
The embodiment of the invention also provides a control device of the high-power high-frequency switching power supply, the high-power high-frequency switching power supply comprises a control module and power modules which are connected with the control module in parallel and communicated with each other, and the control device comprises:
the first acquisition module is used for acquiring a control instruction; for details, please refer to the above example S1, which is not described herein again;
the first processing module is used for generating PWM control signals based on the control instructions and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; wherein the working parameters comprise switching frequency, pulse width and pulse starting point; controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization; for details, please refer to the above example S2, which is not described herein again;
optionally, the control device comprises: the second acquisition module is used for acquiring a control signal of the power supply module, wherein the control signal is used for representing working parameters of the power supply module; for details, please refer to the above example S3, which is not described herein again; the second processing module is used for executing the step of acquiring the control instruction when the current working parameter of the power supply module is different from the preset working parameter; for details, please refer to the above example S4, which is not described herein again;
optionally, the first processing module includes: the control unit is used for carrying out PID adjustment on the control signal according to the PWM control signal; for details, please refer to the above example S5, which is not described herein again; the first adjusting unit is used for adjusting the pulse width of the power supply module to a preset pulse width through PID adjustment; for details, please refer to the above example S6, which is not described herein again;
optionally, the control unit comprises: the acquisition unit is used for acquiring a preset PWM signal according to the PWM control signal; for details, please refer to the above example S7, which is not described herein again; the second adjusting unit is used for carrying out PID adjustment on the preset PWM signal and the control signal; for details, please refer to the above example S8, which is not described herein again.
So set up, through using the same PWM control signal, can adjust each parallel power supply module in the high-power high frequency switching power supply to with control module's switching frequency the same, pulse width is the same and the same pulse initial point, make each parallel power supply module with the same switching frequency, the same pulse width, work in step, thereby each parallel power supply module can even output current when steady voltage, make output current balanced, it is undulant less, and then improved the reliability, market needs have been satisfied.
Example 3
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute any one of the control methods.
The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Variations and modifications in other variations may occur to those skilled in the art based upon the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A control method of a high-power high-frequency switching power supply is characterized in that the high-power high-frequency switching power supply comprises a control module and power supply modules which are connected with the control module in a communication mode and are connected with each other in parallel, and the control method comprises the following steps:
acquiring a control instruction;
generating PWM control signals based on the control instructions, and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; wherein the working parameters comprise switching frequency, pulse width and pulse starting point;
and controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization.
2. The control method according to claim 1, characterized by, before the obtaining of the control instruction, comprising:
acquiring a control signal of the power supply module, wherein the control signal is used for representing working parameters of the power supply module;
and when the current working parameter of the power supply module is different from the preset working parameter, executing the step of obtaining the control instruction.
3. The control method according to claim 2, wherein the adjusting the current operating parameter of each power module to a preset operating parameter according to the PWM control signal comprises:
carrying out PID regulation on the control signal according to the PWM control signal;
and adjusting the current pulse width of the power supply module to a preset pulse width through PID adjustment.
4. The control method of claim 3, wherein the PID adjusting the control signal according to the PWM control signal comprises:
acquiring a preset PWM signal according to the PWM control signal;
and carrying out PID regulation on the preset PWM signal and the control signal.
5. The control method according to claim 4, wherein the PID adjusting the preset PWM signal and the control signal comprises:
acquiring the pulse width voltage of the preset PWM signal and the pulse width voltage of the control signal according to the preset PWM signal and the control signal;
and carrying out PID regulation on the pulse width voltage of the preset PWM signal and the pulse width voltage controlled by the control signal.
6. A control device of a high-power high-frequency switching power supply is characterized in that the high-power high-frequency switching power supply comprises a control module and power supply modules which are connected with the control module in a communication way and are connected with each other in parallel, and the control device comprises:
the first acquisition module is used for acquiring a control instruction;
the first processing module is used for generating PWM control signals based on the control instructions and adjusting the current working parameters of the power supply modules to preset working parameters according to the PWM control signals; wherein the working parameters comprise switching frequency, pulse width and pulse starting point; and controlling each power supply module through the PWM control signal to enable each power supply module to output signals with the same frequency, the same pulse width and the same synchronization.
7. The control device according to claim 6, characterized by comprising:
the second acquisition module is used for acquiring a control signal of the power supply module, wherein the control signal is used for representing working parameters of the power supply module;
and the second processing module is used for executing the step of acquiring the control instruction when the current working parameter of the power supply module is different from the preset working parameter.
8. The control device of claim 7, wherein the first processing module comprises:
the control unit is used for carrying out PID adjustment on the control signal according to the PWM control signal;
and the first adjusting unit is used for adjusting the current pulse width of the power supply module to a preset pulse width through PID adjustment.
9. The control device according to claim 8, wherein the control unit includes:
the acquisition unit is used for acquiring a preset PWM signal according to the PWM control signal;
and the second regulating unit is used for carrying out PID regulation on the preset PWM signal and the control signal.
10. A computer-readable storage medium storing computer instructions for causing a computer to execute the control method according to any one of claims 1 to 5.
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