CN114977869A - Alternating current switching power supply - Google Patents
Alternating current switching power supply Download PDFInfo
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- CN114977869A CN114977869A CN202210748635.4A CN202210748635A CN114977869A CN 114977869 A CN114977869 A CN 114977869A CN 202210748635 A CN202210748635 A CN 202210748635A CN 114977869 A CN114977869 A CN 114977869A
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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- Inverter Devices (AREA)
Abstract
The application provides an alternating current switching power supply. In the alternating current switch power supply, the input end of each inversion bridge arm is connected with the output end of one direct current switch power supply; each output end of the alternating current switch power supply is connected with the output end of the corresponding inversion bridge arm. In the application, since the common-mode noises of at least two direct-current switching power supplies are mutually offset, the common-mode noise of the alternating-current switching power supply is suppressed; in addition, in the prior art, the frequencies of the driving signals of the direct-current switching power supplies in the alternating-current switching power supplies are the same, namely the number of the noise sources at the same frequency point is equal to the number of the direct-current switching power supplies, so that the noise sources at the same frequency point of the alternating-current switching power supplies do not exceed the prior art when the number of the direct-current switching power supplies is the same, and therefore the differential mode noise of the alternating-current switching power supplies can be kept unchanged at least; to sum up, the ac switching power supply provided by the present application enables EMI of itself to be suppressed.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an alternating current switching power supply.
Background
In general, most of the inverter topologies in the ac switching power supply are three-phase two-level inverter topologies, as shown in fig. 1; in practical applications, because each phase of the inverter bridge has a relatively high power requirement on the dc switching power supply, the dc switching power supply is usually configured for each phase of the inverter bridge separately to ensure the electrical safety of the ac switching power supply.
At present, with the increase of product integration and multi-circuit parallel use scenes, the number of direct current switch power supplies configured in an alternating current switch power supply is gradually increased. However, the ac switching power supply is provided with a large number of dc switching power supplies, which greatly increases EMI (Electromagnetic Interference) of the ac switching power supply, and in order to suppress EMI, it is necessary to use a filter device having a larger size, a higher cost, and a larger number in the ac switching power supply, which increases the size and the cost of the ac switching power supply.
Therefore, how to suppress the EMI of the ac switching power supply is an urgent technical problem to be solved.
Disclosure of Invention
In view of the above, the present invention provides an ac switching power supply to suppress EMI of the ac switching power supply.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the application provides an alternating current switching power supply, includes: at least two direct current switch power supplies and at least two inverter bridge arms; wherein:
the input end of each direct current switch power supply is used as the input end corresponding to the alternating current switch power supply one by one;
the input end of each inversion bridge arm is connected with the output end of one direct-current switching power supply;
each output end of the alternating current switching power supply is connected with the output end of the corresponding inversion bridge arm;
common mode noise of at least two direct current switch power supplies is mutually offset.
Optionally, in the driving signals of at least two of the dc switching power supplies with common mode noise cancelled each other:
the frequency of each driving signal is the same, and the sum of the preset phase angles is equal to 2n pi; n is a positive integer;
the preset phase angle is a phase difference between two adjacent driving signals.
Optionally, the at least two dc switching power supplies with common-mode noise cancelled each other include at least two groups of dc switching power supplies; wherein:
each group comprises at least two direct current switching power supplies;
in the driving signals of each direct current switching power supply in each group, the frequencies of the driving signals are the same, the sum of preset phase angles is equal to 2n pi, and the preset phase angle is the phase difference between two adjacent driving signals; n is a positive integer;
the frequencies of the driving signals of the direct current switching power supplies of the respective groups are different from each other.
Optionally, the number of the dc switching power supplies in each group is not completely the same or all the same.
Optionally, in the driving signals of the dc switching power supplies of each group:
the preset frequency differences are not completely the same or all the same, and are the difference between two driving signals with adjacent frequencies.
Optionally, if there is at least one dc switching power supply whose common mode noise cannot be cancelled, in each dc switching power supply whose common mode noise cannot be cancelled:
the frequency of the driving signal of each direct current switch power supply is the same;
alternatively, the first and second liquid crystal display panels may be,
the frequency of the driving signals of the direct current switch power supplies in each group is the same, and the frequency of the driving signals of the direct current switch power supplies in each group is different.
Optionally, the frequency of the driving signal of the dc switching power supply, which cannot be cancelled by the common mode noise, is the same as the frequency of the driving signal of the corresponding dc switching power supply, which is cancelled by the common mode noise;
alternatively, the first and second electrodes may be,
the frequency of the driving signal of the direct current switching power supply which can not be counteracted by the common mode noise is different from the frequency of the driving signal of each direct current switching power supply which can be counteracted by the common mode noise.
Optionally, if at least two dc switching power supplies with common-mode noise cancelled each other include at least two sets of dc switching power supplies, each dc switching power supply with common-mode noise cancelled includes at least two sets of dc switching power supplies, and the frequency of the driving signal of each dc switching power supply with common-mode noise cancelled is different from the frequency of the driving signal of each dc switching power supply with common-mode noise cancelled, in the driving signals of the dc switching power supplies in each set:
the preset frequency differences are not completely the same or all the same, and are the difference between two driving signals connected in frequency.
Optionally, all the dc switching power supplies with the lowest frequency of the driving signal are arranged at the middle position inside the ac switching power supply;
and sequentially arranging the rest direct-current switching power supplies from the middle position to the two sides in the alternating-current switching power supply according to the sequence of the frequency of the driving signal from low to high.
Optionally, the inverter bridge arm is a two-level inverter bridge arm or a multi-level inverter bridge arm.
Optionally, the method further includes: a controller and at least two drive circuits; wherein:
the controller respectively outputs driving signals to the control ends of the inverter bridge arms through the corresponding driving circuits;
the controller is further used for detecting the output current of the direct current switch power supply and the output voltage of the alternating current switch power supply.
Optionally, if the inverter bridge arm is a two-level inverter bridge arm or a three-level inverter bridge arm, the dc switching power supply includes two output ends, one output end supplies power to the upper half bridge arm of the corresponding inverter bridge arm, and the other output end supplies power to the lower half bridge arm of the corresponding inverter bridge arm.
Optionally, an EMC filter corresponding to each output terminal of each dc switching power supply is provided.
According to the technical scheme, the invention provides an alternating current switching power supply, which specifically comprises: at least two direct current switching power supplies and at least two inverter bridge arms. In the alternating current switch power supply, the input end of each inversion bridge arm is connected with the output end of one direct current switch power supply; each output end of the alternating current switch power supply is connected with the output end of the corresponding inversion bridge arm. In the application, since the common-mode noises of at least two direct-current switching power supplies are mutually offset, the common-mode noise of the alternating-current switching power supply is suppressed; in addition, in the prior art, the frequencies of the driving signals of the direct-current switching power supplies in the alternating-current switching power supplies are the same, namely the number of the noise sources at the same frequency point is equal to the number of the direct-current switching power supplies, so that the noise sources at the same frequency point of the alternating-current switching power supplies do not exceed the prior art when the number of the direct-current switching power supplies is the same, and therefore the differential mode noise of the alternating-current switching power supplies can be kept unchanged at least; to sum up, the ac switching power supply provided by the present application enables EMI of itself to be suppressed.
Drawings
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, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 to fig. 3 are schematic structural diagrams of three implementations of an ac switching power supply provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of an embodiment of the dc switching power supply provided in this embodiment;
fig. 5 is a schematic diagram of driving signals of a first dc switching power supply and a second dc switching power supply;
fig. 6 and fig. 7 are schematic structural diagrams of two other embodiments of the ac switching power supply according to the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, 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 necessarily 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, article, 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, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to suppress EMI of the ac switching power supply, the ac switching power supply provided in the embodiment of the present application may specifically include, by reference to fig. 1 (only three dc switching power supplies 10 and three inverter legs 20 are shown as an example, and only two-level inverter legs are shown as an example for inverter legs 20) or fig. 2 (only two dc switching power supplies 10 and three inverter legs 20 are shown as an example, and only two-level inverter legs are shown as an example for inverter legs 20), that is: at least two direct current switching power supplies 10 and at least two inverter bridge arms 20; the number of the dc switching power supplies 10 and the number of the inverter arms 20 can be selected according to actual conditions, and is not limited specifically here.
Optionally, the inverter bridge arm 20 may be a two-level inverter bridge arm, or may also be a multi-level inverter bridge arm, such as a three-level inverter bridge arm, which is not specifically limited herein, and may be determined according to specific situations, and all of which are within the protection scope of the present application.
If the inverter bridge arms 20 are two-level inverter bridge arms or three-level inverter bridge arms, the dc switching power supply 10 includes two output ends, one of the output ends supplies power to the upper half bridge arm of the corresponding inverter bridge arm 20, and the other output end supplies power to the lower half bridge arm of the corresponding inverter bridge arm 20.
The connection relationship between the devices is specifically as follows:
the input end of each dc switch power supply 10 is used as the one-to-one corresponding input end of the ac switch power supply.
The input end of each inversion bridge arm 20 is connected with the output end of one direct current switching power supply 10; it can be derived that, as shown in fig. 1, the output end of one dc switching power supply 10 is connected to the input end of only one inverter bridge arm 20, or, as shown in fig. 2, the output end of one dc switching power supply 10 is connected to the input ends of a plurality of inverter bridge arms 20, and in practical applications, the selection can be performed according to specific requirements, and is not limited specifically herein.
Each output end of the alternating current switching power supply is connected with the output end of the corresponding inverter bridge arm 20; specifically, the corresponding inverter leg 20 may include one inverter leg 20, or may include a plurality of inverter legs 20, that is: as shown in fig. 1 or fig. 2, the output end of each inverter bridge arm 20 serves as an output end of the ac switching power supply, or, as shown in fig. 3, the output ends of a plurality of inverter bridge arms 20 are connected in parallel, and the connection point serves as an output end of the ac switching power supply.
It should be noted that, in practical applications, each output terminal of the ac switching power supply may be connected to a corresponding power supply terminal of the motor, and may also be connected to power supply terminals of other loads, which is not specifically limited herein, and may be selected according to specific requirements, and all of which are within the protection scope of the present application.
The common mode noise of at least two dc switching power supplies 10 can cancel each other.
In the present application, since the common mode noises of at least two dc switching power supplies 10 cancel each other, the common mode noise of the ac switching power supply is suppressed; in addition, since the frequencies of the driving signals of the dc switching power supplies 10 in the ac switching power supply are the same in the related art, that is, the number of noise sources at the same frequency point is equal to the number of the dc switching power supplies 10, when the number of the dc switching power supplies 10 is the same, the number of noise sources at the same frequency point of the ac switching power supply does not exceed the related art, and thus the differential mode noise of the ac switching power supply can be kept at least constant; to sum up, the ac switching power supply provided by the present application enables EMI of itself to be suppressed.
It is worth to be noted that, because the EMI of the ac switching power supply is suppressed, a smaller size, a lower cost, and a smaller number of filter devices can be used in the ac switching power supply, so that both the size and the cost of the ac power supply switch are reduced.
The embodiment of the present application provides a specific implementation manner that common mode noises of at least two dc switching power supplies 10 are mutually cancelled, which is specifically as follows:
in the driving signals of at least two dc switching power supplies 10 in which common mode noise cancels each other: the frequency of each driving signal is the same, and the sum of the preset phase angles is equal to 2n pi.
The preset phase angle is a phase difference between two adjacent driving signals; n is a positive integer, which is not specifically limited herein, and can be selected according to actual conditions, and all of which are within the protection scope of the present application.
Since the frequencies of the driving signals of the dc switching power supplies 10 are the same, the magnitude of the common mode noise of the dc switching power supplies 10 is the same; since each preset phase angle is divided by 2n pi in half, the vector sum of the common mode noises of the dc switching power supplies 10 is a zero vector, and therefore the common mode noises of the dc switching power supplies 10 can be cancelled out.
The present embodiment further provides another specific implementation manner in which common mode noises of at least two dc switching power supplies 10 are cancelled, which is specifically described as follows:
at least two DC switching power supplies 10 with common mode noise mutually offset comprise at least two groups of DC switching power supplies 10; each group comprises at least two dc switching power supplies 10.
Optionally, the number of the dc switching power supplies 10 included in each group may be the same, or may not be the same, for example, the number of the dc switching power supplies 10 included in one group is the same, and the number of the dc switching power supplies 10 included in another group is different; the present invention is not limited to the above embodiments, and the embodiments are within the scope of the present invention.
In the driving signals of the dc switching power supplies 10 in each group, the frequencies of the driving signals are the same, and the sum of the preset phase angles is equal to 2n pi.
The preset phase angle is a phase difference between two adjacent driving signals; n is a positive integer, which is not specifically limited herein, and can be selected according to actual conditions, all of which are within the protection scope of the present application.
It should be noted that the principle of implementing common mode noise cancellation by each dc switching power supply 10 in each group is the same as that in the previous embodiment, and details are not described here.
Further, the frequencies of the drive signals of the dc switching power supplies 10 of the respective groups are different from each other.
In the present embodiment, in at least two dc switching power supplies 10 in which common mode noise is cancelled each other, the frequencies of the driving signals of the dc switching power supplies 10 of each group are different from each other, and therefore the number of noise sources at each frequency point is less than that of the prior art, and therefore, in this embodiment, not only mutual cancellation of common mode noise of at least two dc switching power supplies 10 is achieved, but also differential mode noise of the ac switching power supply is reduced; thereby further suppressing EMI of the ac switching power supply.
Optionally, in the driving signals of the dc switching power supplies 10 of each group, each preset frequency difference may be the same, or may not be the same completely, for example, the frequencies of the driving signals of the dc switching power supplies 10 of a part of the groups are the same, and the frequencies of the driving signals of the dc switching power supplies 10 of another part of the groups are different, where the preset frequency difference is the difference between two driving signals with adjacent frequencies; it is not specifically limited herein, and may be within the scope of the present application depending on the specific circumstances.
In practical application, when the preset frequency differences are the same, the value of the preset frequency difference is preferably in the range of 5kHz to 15 kHz; it should be noted that the value range is an empirically recommended range, and may be adjusted in practical application, and is not specifically limited herein.
In practical applications, in addition to the above-mentioned modes of achieving mutual cancellation of common mode noise, other modes of achieving mutual cancellation of common mode noise are also included, as long as the mode that the vector sum of the common mode noise of each dc switching power supply 10 is a zero vector is within the protection scope of the present application, and the present application is not limited specifically herein, and is within the protection scope of the present application.
Another embodiment of the present application provides another embodiment of an ac switching power supply, which is substantially the same as the above embodiment; the present embodiment is different from the above-described embodiments in that:
there is also at least one dc switching power supply 10 for which common mode noise cannot be cancelled; in each dc switching power supply 10 in which common mode noise cannot be cancelled: the frequencies of the drive signals of the dc switching power supplies 10 are the same.
Optionally, the frequency of the driving signal of the dc switching power supply 10 for which the common mode noise cannot be cancelled may be the same as the frequency of the driving signal of the corresponding dc switching power supply 10 for which the common mode noise is cancelled, or may be different from the frequency of the driving signal of each of the dc switching power supplies 10 for which the common mode noise is cancelled; it is not specifically limited herein, and may be within the scope of the present application depending on the specific circumstances.
The present embodiment also provides another embodiment of an ac switching power supply, which is substantially the same as the above embodiment; the present embodiment is different from the above-described embodiments in that:
at least one DC switching power supply 10 which can not be counteracted by common mode noise exists; in each dc switching power supply 10 in which common mode noise cannot be cancelled: the frequency of the driving signals of the direct current switch power supplies 10 in each group is the same, and the frequency of the driving signals of the direct current switch power supplies 10 in each group is different.
Optionally, the frequency of the driving signal of the dc switching power supply 10 for which the common mode noise cannot be cancelled may be the same as the frequency of the driving signal of the corresponding dc switching power supply 10 for which the common mode noise is cancelled, or may be different from the frequency of the driving signal of each of the dc switching power supplies 10 for which the common mode noise is cancelled; it is not specifically limited herein, and may be within the scope of the present application depending on the specific circumstances.
Another embodiment of the present application provides another embodiment of an ac switching power supply, which is substantially the same as the above embodiment; the present embodiment is different from the above-described embodiments in that:
the at least two dc switching power supplies 10 with common mode noise cancelled each other include at least two sets of dc switching power supplies 10, each dc switching power supply 10 with common mode noise that cannot be cancelled also includes at least two sets of dc switching power supplies 10, and the frequency of the driving signal of each dc switching power supply 10 with common mode noise that cannot be cancelled is different from the frequency of the driving signal of each dc switching power supply 10 with common mode noise that is cancelled.
In addition, in the drive signal of the dc switching power supply 10 of each group: each preset frequency difference may be the same or not, for example, the frequencies of the driving signals of the dc switching power supplies 10 in one part of the groups are the same, and the frequencies of the driving signals of the dc switching power supplies 10 in the other part of the groups are different, where the preset frequency difference is the difference between two driving signals connected in frequency; it is not specifically limited herein, and may be within the scope of the present application depending on the specific circumstances.
In practical application, when the preset frequency differences are the same, the value of the preset frequency difference is preferably in the range of 5kHz to 15 kHz; it should be noted that the value range is an empirically recommended range, and may be adjusted in practical application, and is not specifically limited herein.
In practical applications, to implement the above-mentioned adjustment of the frequency and phase of the driving signal of the dc switching power supply 10, it can be implemented by the timing driver 120 and its peripheral circuit 110, as shown in fig. 4; wherein 130 in fig. 4 denotes a DCDC conversion circuit; before the driver is used, the parameter values of each device in the peripheral circuit need to be configured in advance according to the driving requirements so as to meet the corresponding driving requirements.
Taking the ac switching power supply shown in the figure as an example, the ac switching power supply includes three-phase inverter arms 20, each of the inverter arms 20 is a two-level inverter arm, and the input end of each of the inverter arms 20 is connected to the output end of a separate dc switching power supply, and the frequencies of the drive signals of the three dc switching power supplies are respectively denoted as f1, f2, and f 3.
In the ac switching power supply, f1 ═ f2, f3 ═ f1-f0, and f0 ═ 10 kHz; the drive signal of the first dc switched-mode power supply and the drive signal of the second dc switched-mode power supply are in opposite phase, as shown in fig. 5.
Since the phase of the driving signal of the first dc switching power supply is opposite to that of the driving signal of the second dc switching power supply, at the same time, the voltage of the first dc switching power supply changes from on to off to dv/dt, and the voltage of the second dc switching power supply changes from off to on to-dv/dt, so that the common-mode noise generated by the first dc switching power supply and the second dc switching power supply is opposite, that is, the total noise is dv/dt + (-dv/dt) ═ 0, and therefore the common-mode noise generated by the first dc switching power supply and the second dc switching power supply can be cancelled.
Since f3-f 1-f0, that is, f3< f1-f 2, the differential mode noise of the third dc switching power supply is different from that of the first dc switching power supply or that of the second dc switching power supply; therefore, there is only one noise source at the frequency point f3, and there are two frequency points at the frequency points f1 or f2, that is, there are at most two noise sources at the same frequency point.
In the prior art, f1 is f2 is f3, so that at the same frequency point f1, f2 or f3, three noise sources are used, and therefore, the differential mode noise of the alternating current switching power supply is smaller than that of the alternating current switching power supply in the prior art.
In summary, when f1 is f2, f3 is f1 to f0, and the phases of the driving signal of the first dc switching power supply and the driving signal of the second dc switching power supply are opposite, EMI of the ac switching power supply can be suppressed.
If the alternating current switching power supply comprises two groups of three-phase bridge arms, namely the alternating current switching power supply supplies power to two three-phase motors, the alternating current switching power supply comprises 6 direct current switching power supplies, the input end of each phase of the inverted bridge arm 20 is connected with the output end of the independent direct current switching power supply, the frequencies of driving signals of the 6 direct current switching power supplies are respectively f1 to f6, the first direct current switching power supply and the second direct current switching power supply are divided into a first group, the third direct current switching power supply and the fourth direct current switching power supply are divided into a second group, and the fifth direct current switching power supply and the sixth direct current switching power supply are divided into a third group.
In the ac switching power supply, f1 may be f2, f3 may be f4, f5 may be f6, f3 may be f1 to f0, f5 may be f3 to f0 may be f1 to 2f0, and f0 may be 10 kHz; in addition, the phases of the driving signals of the two dc switching power supplies in each group are opposite, that is: the phase of the driving signal of the first direct current switching power supply is opposite to that of the driving signal of the second direct current switching power supply, the phase of the driving signal of the third direct current switching power supply is opposite to that of the driving signal of the fourth direct current switching power supply, and the phase of the driving signal of the fifth direct current switching power supply is opposite to that of the driving signal of the sixth direct current switching power supply.
The driving signals of the two dc switching power supplies in each group have the same frequency and opposite phases, and the principle of the previous example is referred to: common mode noises of the two direct current switching power supplies in each group can be mutually offset; because f5< f3< f1, there are at most two noise sources at the same frequency point, so the differential mode noise of the ac switching power supply is smaller than that of the ac switching power supply in the prior art.
In summary, when f1 is f2, f3 is f4, f5 is f6, f3 is f1-f0, and f5 is f3-f0-f1-2f0, and the phases of the driving signals of the two dc switching power supplies in each group are opposite, EMI of the ac switching power supply can be suppressed.
Another embodiment of the present application provides a specific implementation manner of an internal arrangement manner of an ac switching power supply, which is specifically described as follows:
all the dc switching power supplies 10 having the lowest frequency of the drive signal are provided at the intermediate positions inside the ac switching power supplies.
The remaining dc switching power supplies 10 are sequentially arranged from the middle position to both sides in the ac switching power supply in the order of the frequency of the driving signal from low to high.
In a certain frequency range, the power consumption of the dc switching power supply 10 is proportional to the frequency of the driving signal of the dc switching power supply 10, so that the higher the frequency of the driving signal of the dc switching power supply 10 is, the larger the power consumption of the dc switching power supply is, that is, the more heat is dissipated.
Under the general condition, the heat dissipation environment of the middle position inside the alternating current switching power supply is poor, so that the heat dissipation speed of the middle position is low, therefore, in the embodiment, all the direct current switching tubes with the lowest frequency of the driving signals are arranged at the middle position inside the alternating current switching power supply, and according to the sequence that the frequency of the driving signals is from low to high, the residual direct current switching power supply 10 is sequentially arranged from the middle position inside the alternating current switching power supply to two sides, the temperature distribution inside the alternating current switching power supply can be more uniform, namely, the heat balance inside the alternating current switching power supply is realized, and the system efficiency and the reliability of the alternating current switching power supply are improved.
Another embodiment of the present application provides another embodiment of an ac switching power supply, and a specific structure thereof can be seen in fig. 6 (shown only on the basis of fig. 1), and the specific structure of this embodiment further includes, on the basis of the above embodiment: a controller 40 and at least two drive circuits 30.
The controller 40 outputs driving signals to the control ends of the inverter bridge arms 20 through the corresponding driving circuits 30; the controller 40 is also configured to detect an output current of the dc switching power supply 10 and an output voltage of the ac switching power supply.
Another embodiment of the present application provides another embodiment of an ac switching power supply, and a specific structure thereof can be seen in fig. 7 (which is shown only on the basis of fig. 6). in addition to the above embodiment, the specific structure of this embodiment further includes: at least two EMC filters 50, wherein a one-to-one EMC filter 50 is provided at each output of each dc switching power supply 10.
In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present application. The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (13)
1. An alternating current switching power supply, comprising: at least two direct current switch power supplies and at least two inverter bridge arms; wherein:
the input end of each direct current switch power supply is used as the input end corresponding to the alternating current switch power supply one by one;
the input end of each inversion bridge arm is connected with the output end of one direct-current switching power supply;
each output end of the alternating current switching power supply is connected with the output end of the corresponding inversion bridge arm;
common mode noise of at least two direct current switch power supplies is mutually offset.
2. An ac switching power supply according to claim 1, wherein, in the drive signals of at least two of said dc switching power supplies whose common mode noises cancel each other:
the frequencies of all driving signals are the same, and the sum of all preset phase angles is equal to 2n pi; n is a positive integer;
the preset phase angle is a phase difference between two adjacent driving signals.
3. The ac switching power supply according to claim 1, wherein at least two groups of said dc switching power supplies are included in at least two of said dc switching power supplies whose common mode noises cancel each other; wherein:
each group comprises at least two direct current switching power supplies;
in the driving signals of each direct current switching power supply in each group, the frequencies of the driving signals are the same, the sum of preset phase angles is equal to 2n pi, and the preset phase angle is the phase difference between two adjacent driving signals; n is a positive integer;
the frequencies of the driving signals of the direct current switching power supplies of the respective groups are different from each other.
4. An alternating current switching power supply according to claim 3, wherein the number of the direct current switching power supplies included in each group is not completely the same or is all the same.
5. An alternating current switching power supply according to claim 3, wherein, in the drive signals of the direct current switching power supplies of the respective groups:
the preset frequency differences are not completely the same or all the same, and the preset frequency difference is the difference between two driving signals with adjacent frequencies.
6. An alternating current switching power supply according to any one of claims 1 to 5, wherein if there is at least one said direct current switching power supply whose common mode noise cannot be cancelled, in each said direct current switching power supply whose common mode noise cannot be cancelled:
the frequency of the driving signal of each direct current switch power supply is the same;
alternatively, the first and second liquid crystal display panels may be,
the frequency of the driving signals of the direct current switch power supplies in each group is the same, and the frequency of the driving signals of the direct current switch power supplies in each group is different.
7. The ac switching power supply according to claim 6, wherein a frequency of the driving signal of the dc switching power supply whose common mode noise cannot be cancelled is the same as a frequency of the driving signal of the corresponding dc switching power supply whose common mode noise is cancelled;
alternatively, the first and second electrodes may be,
the frequency of the driving signal of the direct current switching power supply which can not be counteracted by the common mode noise is different from the frequency of the driving signal of each direct current switching power supply which can be counteracted by the common mode noise.
8. The ac switching power supply according to claim 7, wherein if at least two sets of the dc switching power supplies are included in at least two of the dc switching power supplies whose common mode noises are cancelled, at least two sets of the dc switching power supplies are included in each of the dc switching power supplies whose common mode noises are not cancelled, and a frequency of a driving signal of each of the dc switching power supplies whose common mode noises are not cancelled is different from a frequency of a driving signal of each of the dc switching power supplies whose common mode noises are cancelled, among the driving signals of the dc switching power supplies of each set:
the preset frequency differences are not completely the same or all the same, and are the difference between two driving signals connected in frequency.
9. The ac switching power supply according to any one of claims 1 to 5, wherein all of the dc switching power supplies having the lowest frequency of a drive signal are provided at an intermediate position inside the ac switching power supply;
and sequentially arranging the rest of the direct-current switching power supplies from the middle position to the two sides in the alternating-current switching power supply according to the sequence of the frequency of the driving signals from low to high.
10. The alternating-current switching power supply according to any one of claims 1 to 5, wherein the inverter bridge arm is a two-level inverter bridge arm or a multi-level inverter bridge arm.
11. An alternating current switching power supply according to any one of claims 1 to 5, characterized by further comprising: a controller and at least two drive circuits; wherein:
the controller respectively outputs driving signals to the control ends of the inverter bridge arms through the corresponding driving circuits;
the controller is further configured to detect an output current of the dc switching power supply and an output voltage of the ac switching power supply.
12. The AC switching power supply according to any one of claims 1 to 5, wherein if said inverter bridge arm is a two-level inverter bridge arm or a three-level inverter bridge arm, said DC switching power supply comprises two output terminals, one of which supplies power to the upper half bridge arm of the corresponding inverter bridge arm, and the other of which supplies power to the lower half bridge arm of the corresponding inverter bridge arm.
13. An alternating current switching power supply according to any one of claims 1 to 5, wherein a one-to-one correspondence EMC filter is provided at each output terminal of each of said direct current switching power supplies.
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| CN202210748635.4A CN114977869A (en) | 2022-06-29 | 2022-06-29 | Alternating current switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210748635.4A CN114977869A (en) | 2022-06-29 | 2022-06-29 | Alternating current switching power supply |
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