CN102347683A - Parallel connection jitter frequency switch power supply and method - Google Patents

Parallel connection jitter frequency switch power supply and method Download PDF

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Publication number
CN102347683A
CN102347683A CN2010102414179A CN201010241417A CN102347683A CN 102347683 A CN102347683 A CN 102347683A CN 2010102414179 A CN2010102414179 A CN 2010102414179A CN 201010241417 A CN201010241417 A CN 201010241417A CN 102347683 A CN102347683 A CN 102347683A
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module
power
power supply
switching
frequency
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CN102347683B (en
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张强
邹丽霞
谢鸣静
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Dimension Corp.
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Emerson Network Power Energy Systems Noth America Inc
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Abstract

The invention relates to a parallel connection jitter frequency switch power supply, which comprises a switch driving module and at least two power supply modules in electric parallel connection, wherein the switch driving module sends out at least two switch driving signals for correspondingly driving at least two power supply modules, and the switch frequencies of at least two switch driving signals are fixed and are different. The invention also correspondingly provides a parallel connection jitter frequency method for the switch power supply. Through setting fixed and different switch frequencies for each power supply module or further setting fixed and different switch frequency for power supply sub modules in the power supply module, the harmonic interference is effectively scattered, the harmonic interference energy is reduced, and the electromagnetic interference (EMI) problem of the whole switch power supply system is solved.

Description

Switching Power Supply and method are frequently trembled in a kind of parallel connection
Technical field
The present invention relates to power technology, more particularly, relate to a kind of Switching Power Supply and method that adopts parallelly connected frequency jitter technique.
Background technology
Switching Power Supply is owing to higher dv/dt and di/dt, and stray inductance that exists in its circuit and electric capacity make the difficult elimination of the electromagnetic interference noise of Switching Power Supply.At present, for EMI (Electromagnetic Interference, the electromagnetic interference) problem that solves power-supply system, existing Switching Power Supply adopts the mode of the operating frequency of control switching usually, makes it be cyclic variation.Because the operating frequency of Switching Power Supply is not to immobilize, make the distribution that becomes band of harmonic wave frequency, spectrum energy also is dispersed on the noise band, and total energy is the same, the amplitude of noise reduces on the whole frequency band thereby make.
Yet power-supply system is formed in parallel by at least two power modules usually at present.Not only also there is Harmonic Interference in the single supply module memory in Harmonic Interference between each power module.And existing Switching Power Supply is only controlled the operating frequency of single supply module and is reduced Harmonic Interference.When the operating frequency of at least two power modules is controlled, there are many difficult problems, for example how reasonably to distribute the operating frequency between each module, with effective dispersion of realizing spectrum energy etc.If can not solve the problem that has Harmonic Interference between each power module; To make the various aspects of performance of whole system be difficult to improve; Aspects such as THD (Total Harmonic Distortion, total harmonic distortion), PF (Power Factor, power factor), efficient for example.
Summary of the invention
The technical problem that the present invention will solve is, has the problem of Harmonic Interference between above-mentioned each power module to existing Switching Power Supply, provides a kind of and adopts the Switching Power Supply of parallelly connected frequency jitter technique and parallel connection thereof to tremble frequency method.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of Switching Power Supply; Adopt parallelly connected frequency jitter technique; Promptly set different switching frequencies through between each power module of Switching Power Supply, carrying out communication each power module that is different for each power module is provided with; Its Harmonic Interference that produces is disperseed within the specific limits, thereby reduced the Harmonic Interference energy.
First aspect present invention; Provide a kind of parallel connection to tremble Switching Power Supply frequently; At least two power modules that comprise switch drive module and electric parallel connection; Said switch drive module is sent said at least two power modules of the corresponding driving of at least two switching drive signals; The switching frequency of said at least two switching drive signals is fixed, and the switching frequency of said at least two switching drive signals is unequal.
Tremble in the frequency Switching Power Supply in parallel connection of the present invention, said switch drive module is the master switch driver module that is electrically connected with said at least two power modules simultaneously.
Tremble in the frequency Switching Power Supply in parallel connection of the present invention, said master switch driver module further comprises:
Data acquisition unit, the quantity information and the address information that are used for when said Switching Power Supply powers on, gathering said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of said at least two power modules;
Signal output unit is used for exporting the corresponding switch drive signal respectively to said at least two power modules according to said switching frequency and address information.
Tremble in the frequency Switching Power Supply in parallel connection of the present invention; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module.
Tremble in the frequency Switching Power Supply in parallel connection of the present invention, said main switch driver module comprises:
Data acquisition unit, the quantity information and the address information that are used for when said Switching Power Supply powers on, gathering said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of said at least two power modules;
Signal output unit is used for driving said main power source module according to said main power source module corresponding switch frequency and address information generation switching drive signal;
The data output unit, be used for according to said address information with said at least one send to corresponding respectively from switch drive module from the corresponding switching frequency of power module.
In Switching Power Supply was trembled frequently in parallel connection of the present invention, said at least one switching frequency that receives based on correspondence from switch drive module generated switching drive signal and drives corresponding to power module.
Tremble in the frequency Switching Power Supply in parallel connection of the present invention, said Frequency Distribution unit utilizes following formula to calculate said at least two power modules corresponding switch frequency respectively according to said quantity information:
f i＝f 1+(i-1)×Δf i；
Wherein, i=1,2......N, N are the number of the power module that obtains in the said quantity information, f 1With Δ f iBe preset value, and Δ f iWith f iThe scope of ratio be 3% to 20%.
Tremble in the frequency Switching Power Supply in parallel connection of the present invention, said Frequency Distribution unit calculates i block power supply module corresponding switch frequency f by the bar code sequence arrangement of power module i
Tremble in the frequency Switching Power Supply in parallel connection of the present invention, each in said at least two power modules comprises at least one power supply submodule; And said master switch driver module comprises:
Data acquisition unit, the quantity information and the address information that are used for when said Switching Power Supply powers on, gathering all power supply submodules of said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of all power supply submodules of said at least two power modules;
Signal output unit is used for exporting the power supply submodule that the corresponding switch drive signal is given said at least two power modules respectively according to said switching frequency and address information.
Tremble in the frequency Switching Power Supply in parallel connection of the present invention, each in said at least two power modules comprises at least one power supply submodule; And said main switch driver module comprises:
Data acquisition unit is used for when said Switching Power Supply powers on gathering the quantity information of all power supply submodules of said at least two power modules and the address information of said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of all power supply submodules of said at least two power modules;
Signal output unit; Be used to obtain the power supply submodule corresponding address information of said main power source module, and generate switching drive signal to drive the power supply submodule of said main power source module according to the power supply submodule corresponding switch frequency and the address information of said main power source module;
The data output unit, be used for according to said at least one from the corresponding address information of power module, said at least one power supply submodule corresponding switch frequency from power module is sent to corresponding respectively from switch drive module.
In Switching Power Supply is trembled frequently in parallel connection of the present invention, saidly obtain the address information of corresponding power supply submodule, and generate switching drive signal to drive corresponding power supply submodule according to the switching frequency that receives from switch drive module.
Second aspect present invention provides a kind of parallel connection of Switching Power Supply to tremble frequency method, is used for the power-supply system that at least two power modules by switch drive module and electric parallel connection constitute, and said method comprising the steps of:
S1, send at least two fixed-frequency and mutual unequal switching drive signal by said switch drive module;
S2: each said power module receives switching drive signal and the work with different switching frequencies respectively.
Tremble in the frequency method in parallel connection of the present invention, said switch drive module is during simultaneously with master switch driver module that said at least two power modules are electrically connected, and said step S1 further comprises the following steps of order execution:
A1, the quantity information and the address information of when said Switching Power Supply powers on, gathering said at least two power modules by the master switch driver module;
A2, to be that said at least two power modules are corresponding by the master switch driver module according to said quantity information distribute mutual unequal switching frequency;
A3, export the corresponding switch drive signal by the master switch driver module respectively according to said switching frequency and address information and give said at least two power modules.
Tremble in the frequency method in parallel connection of the present invention; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module; Then said step S1 further comprises:
B1, by the main switch driver module is gathered said at least two power modules when said Switching Power Supply powers on quantity information and address information, change step B2 subsequently;
B2, be corresponding mutual unequal switching frequency, executed in parallel step B3 and the step B4 subsequently of distributing of said at least two power modules according to said quantity information by the main switch driver module;
B3, generate switching drive signal by the main switch driver module according to said main power source module corresponding switch frequency and address information and drive said main power source module;
B4, by the main switch driver module according to said address information with said at least one send to correspondingly respectively from switch drive module from the corresponding switching frequency of power module, generate switching drive signal by said at least one switching frequency that receives according to correspondence from switch drive module and drive corresponding from power module.
Tremble in the frequency method in parallel connection of the present invention, utilize following formula to calculate said at least two power modules corresponding switch frequency respectively among said steps A 2 or the B2:
f i＝f 1+(i-1)×Δf i；
Wherein, i=1,2......N, N are the number of the power module that obtains in the said quantity information, f iWith Δ f iBe preset value, and Δ f iWith f 1The scope of ratio be 3% to 20%.
Tremble in the frequency method in parallel connection of the present invention, said steps A 2 or B2 calculate i block power supply module corresponding switch frequency f by the bar code sequence arrangement of power module i
Tremble in the frequency method in parallel connection of the present invention; When said switch drive module is the master switch driver module that is electrically connected with said at least two power modules simultaneously; And when each in said at least two power modules comprised at least one power supply submodule, said step S1 further comprised the following steps that order is carried out:
C1, the quantity information and the address information of when said Switching Power Supply powers on, gathering all power supply submodules of said at least two power modules by the master switch driver module;
C2, to be that all power supply submodules of said at least two power modules are corresponding by the master switch driver module according to said quantity information distribute mutual unequal switching frequency;
C3, export the power supply submodule that the corresponding switch drive signal is given said at least two power modules respectively according to said switching frequency and address information by the master switch driver module.
Tremble in the frequency method in parallel connection of the present invention; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module; And each in said at least two power modules comprises at least one power supply submodule; Then said step S1 further comprises:
D1,, said Switching Power Supply gathers the quantity information of all power supply submodules of said at least two power modules when powering on by the main switch driver module, and the address information of said at least two power modules, change step D2 subsequently;
D2, according to said quantity information corresponding mutual unequal switching frequency, executed in parallel step D3 and step D4 subsequently of distributing of all power supply submodules of said at least two power modules by the main switch driver module;
D3, obtain the power supply submodule corresponding address information of said main power source module, and generate switching drive signal to drive the power supply submodule of said main power source module according to the power supply submodule corresponding switch frequency and the address information of said main power source module by the main switch driver module;
D4, by the main switch driver module according to said at least one from the corresponding address information of power module; Said at least one power supply submodule corresponding switch frequency from power module is sent to corresponding respectively from switch drive module; Obtain the address information of corresponding power supply submodule by said from switch drive module, and generate switching drive signal to drive corresponding power supply submodule according to the switching frequency that receives.
Switching Power Supply and method thereof are frequently trembled in the parallel connection of embodiment of the present invention; Have following beneficial effect: the present invention sets different switching frequencies through switch drive module for each power module; It perhaps is the different switching frequency of power supply submodule setting in the power module; Thereby effectively Harmonic Interference is disperseed; Reduce the Harmonic Interference energy, solved the EMI problem of whole switch power supply system.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further, in the accompanying drawing:
Fig. 1 is that the sketch map of Switching Power Supply first embodiment is frequently trembled in parallel connection provided by the invention;
Fig. 2 is that the sketch map of the master switch driver module of Switching Power Supply first embodiment is frequently trembled in parallel connection provided by the invention;
Fig. 3 is that the sketch map of Switching Power Supply second embodiment is frequently trembled in parallel connection provided by the invention;
Fig. 4 is that the sketch map of the main switch driver module of Switching Power Supply second embodiment is frequently trembled in parallel connection provided by the invention;
Fig. 5 is that the sketch map of Switching Power Supply the 3rd embodiment is frequently trembled in parallel connection provided by the invention;
Fig. 6 is that the sketch map of Switching Power Supply the 4th embodiment is frequently trembled in parallel connection provided by the invention;
Fig. 7 is that Harmonic Interference distribution schematic diagram in the frequency Switching Power Supply is trembled in parallel connection provided by the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.
The power module that the frequency Switching Power Supply comprises switch drive module and at least two parallel connections is trembled in parallel connection provided by the invention.The present invention adopts frequency jitter technique between each power module; Promptly send said at least two power modules of the corresponding driving of at least two switching drive signals by switch drive module; The switching frequency of said at least two switching drive signals is fixed, and the switching frequency of said at least two switching drive signals is unequal.The present invention mainly can adopt dual mode to implement, and is respectively first embodiment and second embodiment embodies.
See also Fig. 1, for the sketch map of Switching Power Supply first embodiment is frequently trembled in parallel connection provided by the invention.As shown in Figure 1, in first embodiment.The power module that Switching Power Supply frequently comprises N electric parallel connection is trembled in parallel connection, i.e. first power module 100-1 to the N power module 100-N, and wherein N is more than or equal to 2.Said switch drive module is the master switch driver module 200 that is electrically connected with said at least two power modules simultaneously.
See also Fig. 2, tremble the module diagram of master switch driver module among frequency Switching Power Supply first embodiment for parallel connection provided by the invention.As shown in Figure 2, said master switch driver module 200 further comprises data acquisition unit 210, Frequency Distribution unit 220 and signal output unit 230.
Wherein, Said data acquisition unit 210 is used for when said Switching Power Supply powers on, gathering the quantity information and the address information of said at least two power modules; Promptly obtain the quantity N of first power module 100-1 to the N power module 100-N of parallel connection in the Switching Power Supply, and address information separately.
Frequency Distribution unit 220 links to each other with data acquisition unit 210; Being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of said at least two power modules, promptly is respectively first power module 100-1 to the N power module 100-N and distributes a switching frequency.For example, be that the first power module 100-1 distributes the first switching frequency f 1, for second source module 100-2 distributes the second switch frequency f 2... by that analogy, be that N power module 100-N distributes N switching frequency f NAnd the first switching frequency f 1To N switching frequency f NUnequal mutually.
Signal output unit 230 links to each other with Frequency Distribution unit 220 with data acquisition unit 210 simultaneously; Be used for exporting the corresponding switch drive signal respectively to said at least two power modules according to said switching frequency and address information; Promptly generate first switching drive signal to the N switching drive signal respectively; And utilize the address information of first power module 100-1 to the N power module 100-N that data acquisition unit 210 obtains, these switching drive signal correspondences are sent to each power module.For example, generation has the first switching frequency f 1First switching drive signal, and utilize the address information of the first power module 100-1 that this first switching drive signal is sent to the first power module 100-1.Likewise, generation has the second switch frequency f 2The second switch drive signal, and utilize the address information of second source module 100-2 that this second switch drive signal is sent to second source module 100-2.Until driving all first power module 100-1 to the N power module 100-N work.Because the switching frequency of the switching drive signal that the first power module 100-1, second source module 100-2...... N power module 100-N receive is neither identical; Make the Harmonic Interference that each power module produced disperse within the specific limits, thereby reduced the Harmonic Interference energy.
See also Fig. 3, for the sketch map of Switching Power Supply second embodiment is frequently trembled in parallel connection provided by the invention.As shown in Figure 3, the power module that Switching Power Supply frequently comprises N electric parallel connection is equally trembled in parallel connection in a second embodiment, i.e. first power module 100-1 to the N power module 100-N, and wherein N is more than or equal to 2.The difference of second embodiment and first embodiment is, is provided with switch drive module in each power module.In the present embodiment, need choose any one power module as main power source module, and in the Switching Power Supply other all power modules as from power module.Here comprise at least two power modules owing in the Switching Power Supply, so have at least one in the Switching Power Supply from power module.Correspondingly; Said switch drive module comprises the main switch driver module of being located in the power module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module.
For example, be main power source module with the first power module 100-1, second source module 100-2 to the N power module 100-N is for to describe from power module.Correspondingly, the switch drive module 1 that is provided with in the first power module 100-1 be the main switch driver module, in second source module 100-2 to the N power module 100-N respectively the switch drive module 2 of setting to switch drive module N be from switch drive module.
See also Fig. 4, tremble the module diagram of main switch driver module among frequency Switching Power Supply second embodiment for parallel connection provided by the invention.As shown in Figure 4; Said main switch driver module is the master switch driver module that switch drive module 1 is equivalent to first embodiment among Fig. 2; Also comprise data acquisition unit 310, Frequency Distribution unit 320 and signal output unit 330; Difference is that the signal output unit 230 of function and master switch driver module of signal output unit 330 of main switch driver module is slightly different, and the main switch driver module also comprises data output unit 340.
Wherein, Data acquisition unit 310 is identical with data acquisition unit 210 functions of master switch driver module; Be used for when said Switching Power Supply powers on, gathering the quantity information and the address information of said at least two power modules; Promptly obtain the quantity N of first power module 100-1 to the N power module 100-N of parallel connection in the Switching Power Supply, and address information separately.
Frequency Distribution unit 320 is identical with Frequency Distribution unit 220 functions of master switch driver module; It links to each other with said data acquisition unit 310; Being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of said at least two power modules, promptly is respectively first power module 100-1 to the N power module 100-N and distributes a switching frequency.For example, be that the first power module 100-1 distributes the first switching frequency f 1, for second source module 100-2 distributes the second switch frequency f 2... by that analogy, be that N power module 100-N distributes N switching frequency f NAnd the first switching frequency f 1To N switching frequency f NUnequal mutually.
Signal output unit 330 links to each other with Frequency Distribution unit 320 with said data acquisition unit 310 simultaneously, is used for driving said main power source module according to said main power source module corresponding switch frequency and address information generation switching drive signal; Promptly generate and have the first switching frequency f 1First switching drive signal, and utilize the address information of the first power module 100-1 that this first switching drive signal is sent to the first power module 100-1.
Data output unit 340 links to each other with Frequency Distribution unit 320 with said data acquisition unit 310 simultaneously, be used for according to said address information with said at least one switching frequency from the power module correspondence send to respectively correspondence from switch drive module.Promptly utilize the address information of second source module 100-1 to the N power module 100-N that data acquisition unit 310 obtains, respectively with the second switch frequency f 2To N switching frequency f NCorrespondence is sent to each from switch drive module.For example, utilize the address information of second source module 100-2, with the second switch frequency f 2Send to switch drive module 2...... and utilize the address information of N power module 100-N, with the second switch frequency f NSend to switch drive module N.
Therefore; In a second embodiment; Switch drive module 1, switch drive module 2...... switch drive module N are through controlling the mode from the switch drive pattern with the main switch driver module; Make that the switching frequency of the switching drive signal of transmission is neither identical separately; Also make the corresponding Harmonic Interference that power module produced that receives disperse within the specific limits, thereby reduced the Harmonic Interference energy.
In order to disperse Harmonic Interference, the present invention to give a kind of preferable frequency allocation plan further.Is that said at least two power modules distribute corresponding switch frequency according to said quantity information according to certain rule by the Frequency Distribution unit.If N is the number of the power module that obtains in the said quantity information, f 1Be the switching frequency of the first preset power module 100-1, and preset switches frequency-splitting Δ f i(Δ f iCan be changeless, also can change to some extent) along with the difference of power module.Get variable i=1,2......N simultaneously.Then the following formula of Frequency Distribution unit by using calculates the switching frequency of i power module 100-i:
f i＝f 1+(i-1)×Δf i； (1)
And the switching frequency of the switching drive signal of N power module 200-N is:
f N＝f 1+(N-1)×Δf i。(2)
In above-mentioned formula, f 1With Δ f iValue depend primarily on EMC effect and module itself stability.For example, tolerable temperature of hardware etc.If both ratio is too little, the switching frequency shake is too little, and the stranding yupin effect of noise is not obvious; If both ratios are too big, the switching frequency shake is too big, and is influenced on possible job insecurity of module meeting or the performance.Therefore, above-mentioned f 1With Δ f iValue need satisfy and make the switching frequency of each power module in the Switching Power Supply less than its limiting frequency value.In the present invention, according to above-mentioned relation and influencing factor thereof, Δ f iWith f 1The scope of ratio be 3% to 20%, preferred 5% to 10%.
Need explanatorily be, come the distribution of switching frequency is illustrated, use and be understood that those skilled in the art can carry out any conversion to above-mentioned formula and distribute to realize reasonable frequency though provided a kind of concrete formula among the application.For example above-mentioned formula (1) and (2) also can adopt following formula (3) and (4) to represent respectively, consequently are equal to.
f i＝f 1-(i-1)×Δf i (3)
f N＝f 1-(N-1)×Δf i (4)
Further, the Frequency Distribution unit result that a series of aforementioned calculation processes obtain that prestores forms the frequency corresponding lists.For example quantity N is 2 corresponding two frequency f that the above-mentioned formula of process calculates in the frequency corresponding lists 1And f 2For distributing to the first power module 100-1 and second source module 100-2; Quantity N is 3 corresponding three frequency f that the above-mentioned formula of process calculates 1, f 2And f 3, for distributing to the first power module 100-1, second source module 100-2 and the 3rd power module 100-3.Therefore, the Frequency Distribution unit only need can inquire the corresponding switching frequency of each power module through the said frequencies corresponding lists after obtaining quantity information.
Further; Above-mentioned switching frequency can be arranged in order according to the bar code of power module and distribute in proper order; For example, according to the bar code order be respectively the first power module 100-1, second source module 100-2...... N power module 100-N provides the switching frequency that increases progressively successively.Each power module distributes more rationally on the locus, the distribution of its frequency is also more orderly thereby make.
See also Fig. 5, for the sketch map of Switching Power Supply the 3rd embodiment is frequently trembled in parallel connection provided by the invention.As shown in Figure 5; The 3rd embodiment is identical with the general structure of first embodiment among Fig. 1; Also adopt master switch driver module 200 to control said at least two power modules, difference only is that each in said at least two power modules further comprises at least one power supply submodule.For example, the first power module 100-1, second source module 100-2....... N power module 100-N comprise M respectively 1, M 2... M NIndividual power supply submodule.The unit of then said master switch driver module 200 form with annexation also with Fig. 2 in identical, difference only is that the function of each unit realization is slightly different:
Wherein, Said data acquisition unit 210 is gathered the quantity information and the address information of all power supply submodules of said at least two power modules when said Switching Power Supply powers on, promptly obtain the quantity M=M of all power supply submodules of first power module 100-1 to the N power module 100-N in the Switching Power Supply 1+ M 2+ ... M N, and the address information of each power supply submodule.
Frequency Distribution unit 220 promptly is respectively power supply submodule 1 to the power supply submodule M of the first power module 100-1 according to the mutual unequal switching frequency of the corresponding distribution of all power supply submodules that said quantity information M is said at least two power modules 1..., power supply submodule 1 to the power supply submodule M of N power module 100-N NDistribute a switching frequency.For example, be the power supply submodule 1 distribution first switching frequency f of the first power module 100-1 1, be that the power supply submodule 2 of the first power module 100-1 distributes the second switch frequency f 2... by that analogy, be the power supply submodule M of N power module 100-N NDistribute M switching frequency f MAnd the first switching frequency f 1To N switching frequency f MUnequal mutually.Can adopt equally in this Frequency Distribution unit 220 that any one calculates M switching frequency in the above-mentioned formula (1) to (4), perhaps find out M switching frequency according to the frequency corresponding lists, correspondence is distributed to each power supply submodule.
Signal output unit 230 is exported the power supply submodule that the corresponding switch drive signal is given said at least two power modules respectively according to said switching frequency and address information; Promptly generate first switching drive signal to the N switching drive signal respectively; And utilize the address information of each power supply submodule among first power module 100-1 to the N power module 100-N that data acquisition unit 210 obtains, these switching drive signal correspondences are sent to each power module.For example, generation has the first switching frequency f 1First switching drive signal, and utilize the address information of the power supply submodule 1 of the first power module 100-1 this first switching drive signal to be sent to the power supply submodule 1 of the first power module 100-1.Likewise, generation has the second switch frequency f 2The second switch drive signal, and utilize the address information of the power supply submodule 2 of the first power module 100-1 this second switch drive signal to be sent to the power supply submodule 2 of the first power module 100-1.Until the power supply submodule work that drives all first power module 100-1 to the N power module 100-N.Because the power supply submodule 1 of the first power module 100-1 is to M 1, second source module 100-2 power supply submodule 1 to M 2... the power supply submodule 1 of N power module 100-N is to M NThe switching frequency of the switching drive signal that receives is neither identical, and the Harmonic Interference that makes each power supply submodule produced is disperseed within the specific limits, thereby has reduced the Harmonic Interference energy.
See also Fig. 6, for the sketch map of Switching Power Supply the 4th embodiment is frequently trembled in parallel connection provided by the invention.As shown in Figure 6, the 4th embodiment is identical with the general structure of second embodiment among Fig. 3, also in each power module, is provided with switch drive module, and difference only is that each in said at least two power modules comprises at least one power supply submodule.For example, the first power module 100-1, second source module 100-2...... N power module 100-N comprise M respectively 1, M 2... M NIndividual power supply submodule.The unit of then said master switch driver module form with annexation also with Fig. 4 in identical, difference only is that the function of each unit realization is slightly different:
Wherein, Data acquisition unit 310 is used for when said Switching Power Supply powers on, gathering the quantity information of all power supply submodules of said at least two power modules; And the address information of said at least two power modules, promptly obtain the quantity M=M of all power supply submodules of first power module 100-1 to the N power module 100-N in the Switching Power Supply 1+ M 2+ ... M N, and the address information of first power module 100-1 to the N power module.
Frequency Distribution unit 320 is identical with the Frequency Distribution unit 220 of master switch driver module among the 3rd embodiment; All power supply submodules that to be used for according to said quantity information M be said at least two power modules are corresponding to distribute mutual unequal switching frequency, promptly is respectively power supply submodule 1 to the power supply submodule M of the first power module 100-1 1..., power supply submodule 1 to the power supply submodule M of N power module 100-N NDistribute a switching frequency.For example, be the power supply submodule 1 distribution first switching frequency f of the first power module 100-1 1, be that the power supply submodule 2 of the first power module 100-1 distributes the second switch frequency f 2... by that analogy, be the power supply submodule M of N power module 100-N NDistribute M switching frequency f MAnd the first switching frequency f 1To N switching frequency f MUnequal mutually.Can adopt equally in this Frequency Distribution unit 220 that any one calculates M switching frequency in the above-mentioned formula (1) to (4), perhaps find out M switching frequency according to the frequency corresponding lists, correspondence is distributed to each power supply submodule.
Signal output unit 330 generates the power supply submodule that switching drive signal drives said main power source module according to the power supply submodule corresponding switch frequency and the address information of said main power source module; Promptly generate and have the first switching frequency f 1First switching drive signal, and the address information of obtaining the power supply submodule 1 of the first power module 100-1 sends to this first switching drive signal the power supply submodule 1 of the first power module 100-1.... generation has M 1Switching frequency f M1M 1Switching drive signal, and obtain the power supply submodule M of the first power module 100-1 1Address information with this M 1Switching drive signal sends to the power supply submodule M of the first power module 100-1 1
Data output unit 340 according to said at least one from the corresponding address information of power module, said at least one power supply submodule corresponding switch frequency from power module is sent to corresponding respectively from switch drive module.Promptly utilize the address information of the power supply submodule of second source module 100-1 to the N power module 100-N that data acquisition unit 310 obtains, respectively with M 1+ 1 switching frequency f M1+1To M switching frequency f MCorrespondence is sent to each from switch drive module.For example, utilize the address information of second source module 100-2, with M 1+ 1 switching frequency f M1+1To M 1+ M 2Switching frequency f M1+M2Send to switch drive module 2...... and utilize the address information of N power module 100-N, with M1+M2+......+M N-1+ 1 switching frequency to the M switching frequency f MSend to switch drive module N.
In the 4th embodiment, obtain the address information of corresponding power supply submodule from switch drive module, and generate switching drive signal to drive corresponding power supply submodule according to the switching frequency that receives.For example, switch drive module 2 is obtained among the second source module 100-2 power supply submodule 1 to M 2Address information, and generate and to have M 1+ 1 switching frequency f M1+1M 1+ 1 switching drive signal driving power submodule 1 ... generation has M 1+ M 2Switching frequency f M1+M2M 1+ M 2Switching drive signal driving power submodule M.Likewise, the power supply submodule in the power module under each switch drive module drives as switch drive module 2 separately.
Because the power supply submodule 1 of the first power module 100-1 is to M 1, second source module 100-2 power supply submodule 1 to M 2... the power supply submodule 1 of N power module 100-N is to M NThe switching frequency of the switching drive signal that receives is neither identical, and the Harmonic Interference that makes each power supply submodule produced is disperseed within the specific limits, thereby has reduced the Harmonic Interference energy.
Therefore; Implementation principle of the present invention is; For providing switching frequency, fixes and mutual unequal switching drive signal each power module; If also contain the power supply submodule in the power module; Then adopt switching frequency to fix equally and mutual unequal switching drive signal drives each power supply submodule, can disperse Harmonic Interference effectively like this.Need explanatorily be that the present invention can also adopt multiple mode to realize.For example; If on the basis of the Switching Power Supply that adopts above-mentioned switching frequency distribution method control, increase new parallel electric source module; Can regulate the switching frequency between each power module or each power supply submodule automatically with reference to above-mentioned rule, only need satisfy mentioned above principle and get final product.The present invention is also corresponding to provide a kind of parallel connection of Switching Power Supply to tremble frequency method, is used for the power-supply system that is made up of switch drive module and electric parallel connection at least two and power module, and this method may further comprise the steps:
At first in step S1, send at least two fixed-frequency and mutual unequal switching drive signal by said switch drive module;
In step S2, each said power module receives switching drive signal and the work with different switching frequencies respectively subsequently.
Above-mentioned four kinds of different structures according to this power-supply system describe method provided by the invention below.
In first embodiment of the invention, promptly as shown in Figure 1, said switch drive module is the master switch driver module that is electrically connected with said at least two power modules simultaneously.Said step S1 further comprises the following steps that order is carried out:
At first in steps A 1,, said Switching Power Supply gathers the quantity information and the address information of said at least two power modules when powering on by the master switch driver module;
In steps A 2, be the mutual unequal switching frequency of the corresponding distribution of said at least two power modules according to said quantity information subsequently by the master switch driver module;
In steps A 3, export the corresponding switch drive signal respectively to said at least two power modules according to said switching frequency and address information at last by the master switch driver module.
In second embodiment of the invention; Promptly as shown in Figure 3; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module.Then said step S1 further comprises: at first in step B1, by the main switch driver module is gathered said at least two power modules when said Switching Power Supply powers on quantity information and address information, change step B2 subsequently;
In step B2, be corresponding mutual unequal switching frequency, executed in parallel step B3 and the step B4 subsequently of distributing of said at least two power modules according to said quantity information subsequently by the main switch driver module;
In step B3, drive said main power source module according to said main power source module corresponding switch frequency and address information generation switching drive signal by the main switch driver module;
In step B4; By the main switch driver module according to said address information with said at least one send to correspondingly respectively from switch drive module from the corresponding switching frequency of power module, generate switching drive signal by said at least one switching frequency that receives according to correspondence from switch drive module and drive corresponding from power module.
In third embodiment of the invention, promptly as shown in Figure 5, said switch drive module is the master switch driver module that is electrically connected with said at least two power modules simultaneously, and in said at least two power modules each comprises at least one power supply submodule.Said step S1 further comprises the following steps that order is carried out:
At first in step C1,, said Switching Power Supply gathers the quantity information and the address information of all power supply submodules of said at least two power modules when powering on by the master switch driver module;
In step C2, according to said quantity information the mutual unequal switching frequency of the corresponding distribution of all power supply submodules of said at least two power modules subsequently by the master switch driver module;
In step C3, export the power supply submodule that the corresponding switch drive signal is given said at least two power modules respectively according to said switching frequency and address information subsequently by the master switch driver module.
In fourth embodiment of the invention; Promptly as shown in Figure 6; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module; And each in said at least two power modules comprises at least one power supply submodule.Then said step S1 further comprises:
At first in step D1,, said Switching Power Supply gathers the quantity information of all power supply submodules of said at least two power modules when powering on by the main switch driver module, and the address information of said at least two power modules, change step D2 subsequently;
In step D2, according to said quantity information corresponding mutual unequal switching frequency, the executed in parallel step D3 and the step D4 subsequently of distributing of all power supply submodules of said at least two power modules subsequently by the main switch driver module;
In step D3; Obtain the power supply submodule corresponding address information of said main power source module by the main switch driver module, and generate switching drive signal to drive the power supply submodule of said main power source module based on the power supply submodule corresponding switch frequency and the address information of said main power source module;
In step D4; By the main switch driver module according to said at least one from the corresponding address information of power module; Said at least one power supply submodule corresponding switch frequency from power module is sent to corresponding respectively from switch drive module; Obtain the address information of corresponding power supply submodule by said from switch drive module, and generate switching drive signal to drive corresponding power supply submodule according to the switching frequency that receives.
In preferred embodiment of the present invention, also can utilize formula (1) to formula (4) to calculate said at least two power modules corresponding switch frequency respectively among steps A 2 or the B2.f 1With Δ f iValue depend on EMC effect and module itself stability, Δ f equally iWith f 1The scope of ratio be 3% to 20%, preferred 5% to 10%.
Further, also can obtain each corresponding frequency of power module quantity among steps A 2 or the B2 through the frequency corresponding lists that inquiry prestores.
Further, also can calculate i block power supply module corresponding switch frequency f in steps A 2 or B2 by the bar code sequence arrangement of power module i
In addition, also can use the corresponding frequency of power supply submodule that each power module was calculated or searched to above-mentioned formula or frequency correspondence table among method step C2 provided by the invention and the D2.
See also Fig. 7, for Harmonic Interference distribution schematic diagram in the frequency Switching Power Supply is trembled in parallel connection provided by the invention.As shown in Figure 7; Because the present invention sets fixing and mutual unequal switching frequency for each power module; It perhaps further is the fixing and mutual unequal switching frequency (not shown) of power supply submodule setting in the power module; The Harmonic Interference that each power module and power supply submodule are produced scatter; Thereby reduced the Harmonic Interference energy, solved the EMI problem of whole switch power supply system.The present invention can also respective design satisfy above-mentioned f 1To f NBandwidth range in filter, further filtering electromagnetic interference.In addition; Compare with the method for conventional suppression EMI; Parallelly connected frequency jitter technique provided by the invention adopts power semiconductor integrated chip internal circuit to improve EMI; Can consider with the little filter of volume; And can save the cost of peripheral component; Do not rely on designer's experience, the reliability of system is provided.
The present invention is based on that specific embodiment describes, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of technology of the present invention, can carry out many modifications and not break away from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.

Claims (18)

1. Switching Power Supply is frequently trembled in a parallel connection, comprises at least two power modules of switch drive module and electric parallel connection, it is characterized in that:
Said switch drive module is sent said at least two power modules of the corresponding driving of at least two switching drive signals, and the switching frequency of said at least two switching drive signals is fixed, and the switching frequency of said at least two switching drive signals is unequal.
2. Switching Power Supply is frequently trembled in parallel connection according to claim 1, it is characterized in that, said switch drive module is the master switch driver module that is electrically connected with said at least two power modules simultaneously.
3. Switching Power Supply is frequently trembled in parallel connection according to claim 2, it is characterized in that said master switch driver module further comprises:
Data acquisition unit, the quantity information and the address information that are used for when said Switching Power Supply powers on, gathering said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of said at least two power modules;
Signal output unit is used for exporting the corresponding switch drive signal respectively to said at least two power modules according to said switching frequency and address information.
4. Switching Power Supply is frequently trembled in parallel connection according to claim 1; It is characterized in that; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module.
5. Switching Power Supply is frequently trembled in parallel connection according to claim 4, it is characterized in that said main switch driver module comprises:
Data acquisition unit, the quantity information and the address information that are used for when said Switching Power Supply powers on, gathering said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of said at least two power modules;
Signal output unit is used for driving said main power source module according to said main power source module corresponding switch frequency and address information generation switching drive signal;
The data output unit, be used for according to said address information with said at least one send to corresponding respectively from switch drive module from the corresponding switching frequency of power module.
6. Switching Power Supply is frequently trembled in parallel connection according to claim 5, it is characterized in that, said at least one switching frequency that receives according to correspondence from switch drive module generates switching drive signal and drives corresponding to power module.
7. tremble Switching Power Supply frequently according to claim 3 or 5 described parallel connections, it is characterized in that, said Frequency Distribution unit utilizes following formula to calculate said at least two power modules corresponding switch frequency respectively according to said quantity information:
f i＝f 1+(i-1)×Δf i；
Wherein, i=1,2......N, N are the number of the power module that obtains in the said quantity information, f 1With Δ f iBe preset value, and Δ f iWith f 1The scope of ratio be 3% to 20%.
8. Switching Power Supply is frequently trembled in parallel connection according to claim 7, it is characterized in that said Frequency Distribution unit calculates i block power supply module corresponding switch frequency f by the bar code sequence arrangement of power module i
9. Switching Power Supply is frequently trembled in parallel connection according to claim 2, it is characterized in that each in said at least two power modules comprises at least one power supply submodule; And said master switch driver module comprises:
Data acquisition unit, the quantity information and the address information that are used for when said Switching Power Supply powers on, gathering all power supply submodules of said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of all power supply submodules of said at least two power modules;
Signal output unit is used for exporting the power supply submodule that the corresponding switch drive signal is given said at least two power modules respectively according to said switching frequency and address information.
10. Switching Power Supply is frequently trembled in parallel connection according to claim 4, it is characterized in that each in said at least two power modules comprises at least one power supply submodule; And said main switch driver module comprises:
Data acquisition unit is used for when said Switching Power Supply powers on gathering the quantity information of all power supply submodules of said at least two power modules and the address information of said at least two power modules;
The Frequency Distribution unit, being used for according to said quantity information is the mutual unequal switching frequency of the corresponding distribution of all power supply submodules of said at least two power modules;
Signal output unit; Be used to obtain the power supply submodule corresponding address information of said main power source module, and generate switching drive signal to drive the power supply submodule of said main power source module according to the power supply submodule corresponding switch frequency and the address information of said main power source module;
The data output unit, be used for according to said at least one from the corresponding address information of power module, said at least one power supply submodule corresponding switch frequency from power module is sent to corresponding respectively from switch drive module.
11. Switching Power Supply is frequently trembled in parallel connection according to claim 10; It is characterized in that; Saidly obtain the address information of corresponding power supply submodule, and generate switching drive signal to drive corresponding power supply submodule according to the switching frequency that receives from switch drive module.
12. frequency method is trembled in the parallel connection of a Switching Power Supply, is used for the power-supply system that at least two power modules by switch drive module and electric parallel connection constitute, and it is characterized in that, said method comprising the steps of:
S1, send at least two fixed-frequency and mutual unequal switching drive signal by said switch drive module;
S2: each said power module receives switching drive signal and the work with different switching frequencies respectively.
13. frequency method is trembled in parallel connection according to claim 12, it is characterized in that, said switch drive module is during simultaneously with master switch driver module that said at least two power modules are electrically connected, and said step S1 further comprises the following steps of order execution:
A1, the quantity information and the address information of when said Switching Power Supply powers on, gathering said at least two power modules by the master switch driver module;
A2, to be that said at least two power modules are corresponding by the master switch driver module according to said quantity information distribute mutual unequal switching frequency;
A3, export the corresponding switch drive signal by the master switch driver module respectively according to said switching frequency and address information and give said at least two power modules.
14. frequency method is trembled in parallel connection according to claim 12; It is characterized in that; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module; Then said step S1 further comprises:
B1, by the main switch driver module is gathered said at least two power modules when said Switching Power Supply powers on quantity information and address information, change step B2 subsequently;
B2, be corresponding mutual unequal switching frequency, executed in parallel step B3 and the step B4 subsequently of distributing of said at least two power modules according to said quantity information by the main switch driver module;
B3, generate switching drive signal by the main switch driver module according to said main power source module corresponding switch frequency and address information and drive said main power source module;
B4, by the main switch driver module according to said address information with said at least one send to correspondingly respectively from switch drive module from the corresponding switching frequency of power module, generate switching drive signal by said at least one switching frequency that receives according to correspondence from switch drive module and drive corresponding from power module.
15. tremble frequency method according to claim 13 or 14 described parallel connections, it is characterized in that, utilize following formula to calculate said at least two power modules corresponding switch frequency respectively among said steps A 2 or the B2:
f i＝f 1+(i-1)×Δf i；
Wherein, i=1,2......N, N are the number of the power module that obtains in the said quantity information, f 1With Δ f iBe preset value, and Δ f iWith f 1The scope of ratio be 3% to 20%.
16. frequency method is trembled in parallel connection according to claim 15, it is characterized in that, said steps A 2 or B2 calculate i block power supply module corresponding switch frequency f by the bar code sequence arrangement of power module i
17. frequency method is trembled in parallel connection according to claim 12; It is characterized in that; When said switch drive module is the master switch driver module that is electrically connected with said at least two power modules simultaneously; And when each in said at least two power modules comprised at least one power supply submodule, said step S1 further comprised the following steps that order is carried out:
C1, the quantity information and the address information of when said Switching Power Supply powers on, gathering all power supply submodules of said at least two power modules by the master switch driver module;
C2, to be that all power supply submodules of said at least two power modules are corresponding by the master switch driver module according to said quantity information distribute mutual unequal switching frequency;
C3, export the power supply submodule that the corresponding switch drive signal is given said at least two power modules respectively according to said switching frequency and address information by the master switch driver module.
18. frequency method is trembled in parallel connection according to claim 12; It is characterized in that; Said at least two power modules comprise that a main power source module and at least one are from power module; Said switch drive module comprises the corresponding respectively main switch driver module of being located in the said main power source module; And be respectively equipped with said at least one at least one in the power module from switch drive module, and said main switch driver module simultaneously with said at least one be electrically connected from switch drive module; And each in said at least two power modules comprises at least one power supply submodule; Then said step S1 further comprises:
D1,, said Switching Power Supply gathers the quantity information of all power supply submodules of said at least two power modules when powering on by the main switch driver module, and the address information of said at least two power modules, change step D2 subsequently;
D2, according to said quantity information corresponding mutual unequal switching frequency, executed in parallel step D3 and step D4 subsequently of distributing of all power supply submodules of said at least two power modules by the main switch driver module;
D3, obtain the power supply submodule corresponding address information of said main power source module, and generate switching drive signal to drive the power supply submodule of said main power source module according to the power supply submodule corresponding switch frequency and the address information of said main power source module by the main switch driver module;
D4, by the main switch driver module according to said at least one from the corresponding address information of power module; Said at least one power supply submodule corresponding switch frequency from power module is sent to corresponding respectively from switch drive module; Obtain the address information of corresponding power supply submodule by said from switch drive module, and generate switching drive signal to drive corresponding power supply submodule according to the switching frequency that receives.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015135375A1 (en) * 2014-03-13 2015-09-17 刘晓霖 Parallel rapid control system for switch power sources based on double communication ports
WO2022032632A1 (en) * 2020-08-14 2022-02-17 Tridonic Gmbh & Co Kg Control circuit, led driver and control method
CN115668721A (en) * 2020-05-20 2023-01-31 思睿逻辑国际半导体有限公司 Randomization of current in power converters

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Publication number Priority date Publication date Assignee Title
WO2015135375A1 (en) * 2014-03-13 2015-09-17 刘晓霖 Parallel rapid control system for switch power sources based on double communication ports
CN115668721A (en) * 2020-05-20 2023-01-31 思睿逻辑国际半导体有限公司 Randomization of current in power converters
CN115668721B (en) * 2020-05-20 2023-08-15 思睿逻辑国际半导体有限公司 Randomization of current in a power converter
WO2022032632A1 (en) * 2020-08-14 2022-02-17 Tridonic Gmbh & Co Kg Control circuit, led driver and control method
GB2611942A (en) * 2020-08-14 2023-04-19 Tridonic Gmbh & Co Kg Control circuit, LED driver and control method

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