CN105576643A - Load current balancing method and device - Google Patents
Load current balancing method and device Download PDFInfo
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- CN105576643A CN105576643A CN201511021576.7A CN201511021576A CN105576643A CN 105576643 A CN105576643 A CN 105576643A CN 201511021576 A CN201511021576 A CN 201511021576A CN 105576643 A CN105576643 A CN 105576643A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
Abstract
The embodiment of the invention discloses a load current balancing method. The load current balancing method comprises the following steps of sampling a first output current of a first power supply when the first power supply and a second power supply are simultaneously accessed to a load current balancing bus, wherein the powers of the first power supply and the second power supply are different; and adjusting the first output current of the first power supply based on the first output current and a preset load current balancing strategy so that the first output current is consistent with a second output current of the second power supply. The embodiment of the invention simultaneously discloses a load current balancing device.
Description
Technical field
The present invention relates to field of power management, especially relate to a kind of method and device of load current-sharing.
Background technology
Along with the development of science and technology, electronic technology have also been obtained development at full speed, and the kind of electronic product also gets more and more, and people have also enjoyed the various facilities that development in science and technology brings.Present people can pass through various types of electronic equipment, enjoy the comfortable life along with development in science and technology brings.
At present, in order to improve the security reliability of system, two different power supplys are set in same system, the power of these two power supplys can be different, but, in same system, because by pining down of load flow equalizing circuit signal, the power supply of different capacity to mate, and can cause two power supplys can not equal current distribution, or pro-rata electric current, that is, two power supplys cannot work simultaneously, lose the redundancy properties of redundant power, cause the waste of resource.
Summary of the invention
In view of this, the embodiment of the present invention expects the method and the device that provide a kind of load current-sharing, works simultaneously, make full use of system resource, provide good Consumer's Experience to realize different capacity power supply.
For achieving the above object, technical scheme of the present invention is achieved in that
First aspect, the embodiment of the present invention provides a kind of method of load current-sharing, comprising: when described first power supply and second source access load current-sharing bus simultaneously, sample to the first output current of described first power supply, wherein, described first power supply is different from the power of described second source; Based on described first output current and default load current-sharing strategy, the first output current of described first power supply is regulated, make described first output current consistent with the second output current of described second source.
Second aspect, the embodiment of the present invention provides a kind of device of load current-sharing simultaneously, and described device comprises: the first power supply, second source and load current-sharing bus, and described first power supply is different from the power of described second source; Wherein, described first power supply, for when accessing described load current-sharing bus with described second source simultaneously, the first output current of self is sampled, based on described first output current and default load current-sharing strategy, the first output current of self is regulated, makes described first output current consistent with the second output current of described second source.
In the method for the load current-sharing that the embodiment of the present invention provides and device, when different the first power supply of power and second source access load current-sharing bus simultaneously, first output current of the first power supply is sampled, then, based on the first output current and default load current-sharing strategy, first output current of the first power supply is regulated, make the first output current consistent with the second output current of second source, so, realize different capacity power supply to work simultaneously, add the compatibility between different capacity supply module, make full use of system resource, good Consumer's Experience is provided.
Accompanying drawing explanation
Fig. 1 is the structural representation of the load current equalizer in the embodiment of the present invention one to three;
Fig. 2 is the method flow schematic diagram of the load current-sharing in the embodiment of the present invention one;
Fig. 3 is the method flow schematic diagram that the output voltage in the embodiment of the present invention one compensates;
Fig. 4 is the method flow schematic diagram of the load current-sharing in the embodiment of the present invention two;
Fig. 5 is the another kind of structural representation of the load current equalizer in the embodiment of the present invention three;
Fig. 6 is the structural representation of a preferred embodiment of the device of load current-sharing in the embodiment of the present invention three.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
Embodiment one:
The embodiment of the present invention provides a kind of method of load current-sharing, and the method is applied to a load current equalizer, and this device can be arranged in the power module of electronic equipment, is this power electronic equipment.This electronic equipment can be server, switch, local area network bus, large scale panel computer, smart mobile phone etc.
Shown in Figure 1, above-mentioned load current equalizer comprises: the first power supply (PSU, PowerSupplyUnit) 1 and the 2nd PSU2, one PSU1 and the 2nd PSU2 accesses load current-sharing bus (LoadSharingBus) 3 simultaneously, wherein, the device of load current-sharing comprises a PSU1, 2nd PSU2 and load current-sharing bus 3, wherein, one PSU1 is different at full load power with the 2nd PSU2, both access load current-sharing bus 3 respectively by the first diode 41 and the second diode 42, when a PSU1 the first voltage exported in load current-sharing bus 3 be less than the 2nd PSU2 export the second voltage in load current-sharing bus 3 to time, diode 42 conducting that 2nd PSU2 connects, otherwise, diode 41 conducting that one PSU1 connects.
Be described below in conjunction with the method for above-mentioned load balancing apparatus to the load current-sharing that the present embodiment provides.
Shown in Figure 2, the method comprises:
S201: when a PSU and the 2nd PSU accesses load current-sharing bus simultaneously, first output current of a PSU is sampled;
Specifically, when a PSU and the 2nd PSU accesses load current-sharing bus simultaneously, first, input voltage for a PSU carries out voltage transformation, is adjusted to output voltage up to specification, then, obtain the first output current, then, the first output current is sampled.
It should be noted that, in the present embodiment, the sampling for the first electric current can directly measure the first output current, also measuring resistance magnitude of voltage can be passed through, such as, the output main line of a PSU arranges a resistance, gathers the voltage of this resistance, i.e. the first sampled voltage, this first sampled voltage, for characterizing the first electric current, certainly, can also adopt alternate manner to the sampling of the first output current, be as the criterion with actual, the present invention is not specifically limited.
In another embodiment, in order to ensure the stability of a PSU output voltage, and ensure that the output voltage of modules in a PSU is consistent, so, before the above-mentioned step that first output current of a PSU is sampled, can also compensate first output voltage of a PSU, so, shown in Figure 3, said method also comprises:
S301: voltage transitions is carried out to the input voltage of a PSU, obtains the first output voltage;
S302: sample to the first output voltage, obtains voltage sample value;
S303: the voltage desired value of voltage sample value and the first output voltage is compared;
S304: when voltage sample value is different from voltage desired value, based on the difference of voltage sample value and voltage desired value, regulates the first output voltage.
Above-mentioned S301 ~ S304 specifically, when a PSU and the 2nd PSU accesses load current-sharing bus simultaneously, voltage transformation is carried out to the input voltage of a PSU, obtain the first output voltage, then, first output voltage is sampled, if the sampled value of the first output voltage, i.e. the first output voltage of voltage sample value and expectation, namely, when voltage desired value is different, based on the difference of voltage sample value and voltage desired value, the first output voltage is regulated, now, the first output voltage is only up to specification.
It should be noted that, the desired value of above-mentioned first output voltage is what pre-set.
S202: based on the first output current and default load current-sharing strategy, first output current of a PSU is regulated, make the first output current consistent with second output current of the 2nd PSU.
In specific implementation process, when the form by arranging resistance on the output main line of a PSU carries out the sampling of the first input current, S202 can comprise: according to default load current-sharing strategy, amplify, obtain the first voltage for the first sampled voltage characterizing the first output current; If when the first voltage is less than the second voltage, based on the difference of the first voltage and the second voltage, regulate the first output current, wherein, the second voltage is the voltage of the 2nd PSU in load current-sharing bus.
Specifically, the sampling of the first input current is carried out in the form by arranging resistance on the output main line of a PSU, after obtaining the first sampled voltage, according to default load current-sharing strategy, the carrying out of the first sampled voltage is amplified, obtains the voltage after amplifying, i.e. the first voltage.Such as, presetting load current-sharing strategy can be as shown in table 1 below, because the first sampled voltage characterizes the first output current, so the first row list item in table 1 is the first output current value; Certainly, can also directly adopt the first sample voltage value to be used as first row list item, now, presetting load current-sharing strategy can be as shown in table 2 below, wherein, and the voltage of to be value the be resistance of 0.1 Ω of the first sampled voltage in table 2.Certainly, in actual applications, above-mentioned resistance can also be other value, and now, the first sample voltage value is also corresponding to be changed to some extent, and the present invention is not specifically limited.
Table 1
Table 2
Here, table 1 and table 2 only with a PSU full load for 500w, 2nd PSU full load is 1000W is that example is described, and in actual applications, the power of the one PSU and the 2nd PSU full load can also be other value, those skilled in the art can set according to actual conditions for the numerical value in table 1 and table 2, and the present invention is not specifically limited.
Next, after acquisition first voltage, this voltage exports load current-sharing bus to, meanwhile, 2nd PSU also exports the second voltage to load current-sharing bus, so, when the first voltage is less than the second voltage, the diode current flow that 2nd PSU connects, second voltage inputs to a PSU, then, one PSU is based on the difference of the first voltage and the second voltage, regulate the first output current, as carried out pulse width modulation (PWM, PulseWidthModulation) change, or frequency change, improve the first output current, make the first output current consistent with second output current of the 2nd PSU, so, just load current-sharing is achieved.
It should be noted that, in actual applications, when the first output current and the second output current difference little time, carrying out Primary regulation for the first output current just can make it consistent with the second output current, if both differ greatly, just need repeatedly to regulate and it just can be made consistent with the second output current, the present invention is not specifically limited.
In embodiments of the present invention, when the different PSU of power and the 2nd PSU accesses load current-sharing bus simultaneously, first output current of the one PSU is sampled, then, based on the first output current and default load current-sharing strategy, first output current of the one PSU is regulated, make the first output current consistent with second output current of the 2nd PSU, so, realize different capacity power supply to work simultaneously, add the compatibility between different frequency supply module, make full use of system resource, good Consumer's Experience is provided.
Embodiment two:
On the basis of above-described embodiment one, in order to realize Fast Load equilibrium, improve ageing, except first output current of a PSU will regulate, can also regulate second output current of the 2nd PSU, so, described in Fig. 4, said method also comprises:
S401: when a PSU and the 2nd PSU accesses load current-sharing bus simultaneously, second output current of the 2nd PSU is sampled;
S402: based on the second output current and default load current-sharing strategy, second output current of the 2nd PSU is regulated, makes the second output current consistent with the first output current.
In the present embodiment, the adjustment of the 2nd PSU is consistent with the adjustment situation of the PSU in above-described embodiment one, and this is no longer going to repeat them.
Be described with the method for instantiation to the load current-sharing in the present embodiment below.
Composition graphs 1 and Fig. 2, suppose, a PSU1 is 500W at full load power, and the 2nd PSU2 is 1000W at full load power.
So, after a PSU1 and the 2nd PSU2 inserts power line simultaneously, electronic equipment sends power supply power-on command according to the operation of user, and now, a PSU1 and the 2nd PSU2 powers on simultaneously, and exports the same output voltage;
Second step, a PSU1 and the 2nd PSU2 to the first output current and the sampling of the second output current, obtains the first sampled voltage for characterizing the first output current and the second sampled voltage for characterizing the second output current respectively;
3rd step, a PSU1, according to default load current-sharing strategy, amplifies the first sampled voltage, obtains the first voltage, and meanwhile, the 2nd PSU2, according to default load current-sharing strategy, amplifies the second sampled voltage, obtains the second voltage;
4th step, a PSU1 and the 2nd PSU2 exports the first voltage and the second voltage to load balancing bus respectively;
So, when the first voltage is less than the second voltage, a PSU1, based on the difference of the first voltage and the second voltage, regulates the first output current, makes the first output current consistent with the second output current;
When the first voltage is greater than the second voltage, the 2nd PSU2, based on the difference of the first voltage and the second voltage, regulates the second output current, makes the first output current consistent with the second output current;
When the first voltage equals the second voltage, a PSU1 is consistent with the real output of the 2nd PSU2, and now, the first output current is consistent with the second output current, without the need to any adjustment, has realized load current-sharing.
In the present embodiment, when the different PSU of power and the 2nd PSU accesses load current-sharing bus simultaneously, one PSU and the 2nd PSU samples to the first output current and the second output current respectively, then, based on the first output current and/or the second output current and default load current-sharing strategy, first output current of the one PSU and/or second output current of the 2nd PSU are regulated, make first output current of a PSU consistent with second output current of the 2nd PSU, so, realize different capacity power supply to work simultaneously, add the compatibility between different capacity supply module, make full use of system resource, good Consumer's Experience is provided.
Embodiment three:
Based on same inventive concept, the present embodiment provides a kind of device of load current-sharing, consistent with the device of the load current-sharing described in one or more embodiment above-mentioned.
Still with reference to figure 1, this device comprises: a PSU1, the 2nd PSU2 and load current-sharing bus the 3, one PSU1 different from the power of the 2nd PSU2; Wherein, one PSU1, for when self and the 2nd PSU2 accesses load current-sharing bus 3 simultaneously time, the first output current of self is sampled, based on the first output current and default load current-sharing strategy, the first output current of self is regulated, makes the first output current consistent with second output current of the 2nd PSU2.
In such scheme, shown in figure 5, a PSU1, comprising: the first current detecting unit 51, for when a PSU1 and the 2nd PSU2 accesses load current-sharing bus simultaneously, samples to first output current of a PSU1; First current regulation unit 52, for based on the first output current and default load current-sharing strategy, regulates first output current of a PSU1, makes the first output current consistent with second output current of the 2nd PSU2.
In such scheme, the first current regulation unit 52, comprising: scale amplifying subelement, for according to presetting load current-sharing strategy, amplifies the first sampled voltage for characterizing the first output current, obtains the first corresponding voltage; Load current-sharing subelement, for when the first voltage is less than the second voltage, calculates the difference of the first voltage and the second voltage, and wherein, the second voltage is the voltage of the 2nd PSU2 in load current-sharing bus 3; Feedback subelement, for the difference based on the first voltage and the second voltage, regulates the first output current.
In such scheme, a PSU1, also comprises: voltage conversion unit, for before sampling to the first output current, carries out voltage transitions, obtain the first output voltage to the input voltage of a PSU1;
Voltage detection unit, for sampling to the first output voltage, obtains voltage sample value;
Correspondingly, above-mentioned feedback subelement, also for the voltage desired value of voltage sample value and the first output voltage being compared; When voltage sample value is different from voltage desired value, based on the difference of voltage sample value and voltage desired value, regulate the first output voltage.
In actual applications, above-mentioned feedback subelement can regulate the first output voltage and the first output current respectively, also can be regulated the first output voltage and the first output current by logical operation simultaneously.
In such scheme, the 2nd PSU2, comprising: the second current detecting unit, for when a PSU1 and the 2nd PSU2 accesses load current-sharing bus simultaneously, samples to second output current of the 2nd PSU2; Second current regulation unit, for based on the second output current and default load current-sharing strategy, regulates second output current of the 2nd PSU2, makes the second output current consistent with the first output current.
A preferred embodiment of the device of the load current-sharing provided with the present embodiment is below described.
Still shown in Figure 1, the device of load current-sharing comprises a PSU1, 2nd PSU2 and load current-sharing bus 3, wherein, the device of load current-sharing comprises a PSU1, 2nd PSU2 and load current-sharing bus 3, wherein, one PSU1 is different at full load power with the 2nd PSU2, both access load current-sharing bus 3 respectively by the first diode 41 and the second diode 42, when the first voltage that a PSU1 exports load current-sharing bus 3 to is less than the second voltage that the 2nd PSU2 exports in load current-sharing bus 3, diode 42 conducting that 2nd PSU2 connects, otherwise, diode 41 conducting that one PSU1 connects.
First, a PSU is introduced.
Shown in Figure 6, a PSU1 comprises: voltage transformation module 11, voltage detection unit 12, current detecting unit 13, scale amplifying unit 14, load current-sharing unit 15 and feedback unit 16.
Wherein, current detecting unit 13 is above-mentioned first current detecting unit 51, scale amplifying unit 14 is above-mentioned Current amplifier subelement, load current-sharing unit 15 is above-mentioned load current-sharing subelement, feedback unit 16 is above-mentioned feedback subelement, so, above-mentioned first current regulation unit 52 comprises scale amplifying unit 14, load current-sharing unit 15 and feedback unit 16.
Specifically, above-mentioned voltage transformation module is the two-dimensional transform device of the input power of a PSU, for being the first output voltage meeting power demand by the voltage values of input;
Voltage detection unit, for carrying out voltage sample to the first output voltage, and is supplied to feedback unit;
Current detecting unit, for sampling to the first output current of output;
Scale amplifying unit, for the default load current-sharing strategy according to above-mentioned table 1, the first sampled voltage being used for characterizing the first output current obtained of being sampled by current detecting unit carries out scale amplifying, obtains the first voltage, the first voltage is exported to load current-sharing unit, load current-sharing bus;
Load current-sharing unit, for when the first voltage that scale amplifying subelement inputs is less than second voltage of the 2nd PSU, the difference of both calculating, and difference is fed back to feedback unit.
Feedback unit, compares for the first voltage sample value exported of feeding back to voltage detection unit and the voltage desired value of the first output voltage; When sampled value is different from desired value, based on the difference of sampled value and desired value, regulate the first output voltage; Also for the difference of the first voltage of feeding back to according to load current-sharing unit and the second voltage, regulate the first output current.
Secondly, the 2nd PSU2 is introduced.
In the present embodiment, the 2nd PSU2 is consistent with a PSU1, comprising: voltage transformation module 21, voltage detection unit 22, current detecting unit 23, scale amplifying unit 24, load current-sharing unit 25 and feedback unit 26, this is no longer going to repeat them.
It should be noted that, the function that above-mentioned unit realizes can be passed through at one or more Implement of Function Module, and the present invention is not specifically limited.
Here it is pointed out that the description of above device embodiment item, it is similar for describing with said method, has the beneficial effect that same embodiment of the method is identical, does not therefore repeat.For the ins and outs do not disclosed in apparatus of the present invention embodiment, those skilled in the art please refer to the description of the inventive method embodiment and understands, and for saving length, repeats no more here.
In addition, only the scheme that two power supplys with different capacity realize load current-sharing is illustrated in one or more embodiment above-mentioned, the scheme multiple (i.e. two or more) power supply with different capacity being realized to load current-sharing is consistent with above-mentioned, by regulating the output current of each power supply, make these output currents consistent, realize load current-sharing, this is no longer going to repeat them.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of hardware embodiment, software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (10)
1. a method for load current-sharing, comprising:
When described first power supply and second source access load current-sharing bus simultaneously, sample to the first output current of described first power supply, wherein, described first power supply is different from the power of described second source;
Based on described first output current and default load current-sharing strategy, the first output current of described first power supply is regulated, make described first output current consistent with the second output current of described second source.
2. method according to claim 1, is characterized in that, described method also comprises:
When described first power supply and described second source access load current-sharing bus simultaneously, the second output current of described second source is sampled;
Based on described second output current and described default load current-sharing strategy, described second output current is regulated, makes described second output current consistent with described first output current.
3. method according to claim 1, is characterized in that, described based on described first output current and default load current-sharing strategy, regulates, comprising the first output current of described first power supply:
According to described default load current-sharing strategy, the first sampled voltage for characterizing described first output current being amplified, obtaining the first voltage;
When described first voltage is less than the second voltage, based on the difference of described first voltage and the second voltage, regulate described first output current, wherein, described second voltage is the voltage that described second source exports in described load current-sharing bus to.
4. method according to claim 3, is characterized in that, after described acquisition first voltage, described method also comprises:
Export described first voltage to described load current-sharing bus, make when described first voltage is greater than described second voltage, described second source is the second output current according to described first voltage-regulation.
5. method according to claim 1, is characterized in that, before described the first output current to described first power supply is sampled, described method also comprises:
Voltage transitions is carried out to the input voltage of described first power supply, obtains the first output voltage;
Described first output voltage is sampled, obtains voltage sample value;
The voltage desired value of described voltage sample value and described first output voltage is compared;
When described voltage sample value is different from described voltage desired value, based on the difference of described voltage sample value and described voltage desired value, regulate described first output voltage.
6. a device for load current-sharing, described device comprises: the first power supply, second source and load current-sharing bus, and described first power supply is different from the power of described second source; Wherein,
Described first power supply, for when accessing described load current-sharing bus with described second source simultaneously, the first output current of self is sampled, based on described first output current and default load current-sharing strategy, the first output current of self is regulated, makes described first output current consistent with the second output current of described second source.
7. device according to claim 6, is characterized in that, described first power supply, comprising:
First current detecting unit, for when described first power supply and described second source access described load current-sharing bus simultaneously, samples to described first output current;
First current regulation unit, for based on described first output current and described default load current-sharing strategy, regulates the first output current of described first power supply, makes described first output current consistent with the second output current of described second source.
8. device according to claim 7, is characterized in that, described first current regulation unit, comprising:
Scale amplifying subelement, for according to described default load current-sharing strategy, amplifies the first sampled voltage for characterizing described first output current, obtains the first corresponding voltage;
Load current-sharing subelement, for when described first voltage is less than the second voltage, calculates the difference of described first voltage and the second voltage, and wherein, described second voltage is the voltage that described second source exports in described load current-sharing bus to;
Feedback subelement, for the difference based on described first voltage and described second voltage, regulates described first output current.
9. device according to claim 8, is characterized in that, described first power supply, also comprises:
Voltage conversion unit, for before sampling to described first output current, carries out voltage transitions to the input voltage of described first power supply, obtains the first output voltage;
Voltage detection unit, for sampling to described first output voltage, obtains voltage sample value;
Correspondingly, described feedback subelement, also for the voltage desired value of described voltage sample value and described first output voltage being compared; When described voltage sample value is different from described voltage desired value, based on the difference of described voltage sample value and described voltage desired value, regulate described first output voltage.
10. device according to claim 6, is characterized in that, described second source, comprising:
Second current detecting unit, for when described first power supply and described second source access load current-sharing bus simultaneously, samples to the second output current of described second source;
Second current regulation unit, for based on described second output current and described default load current-sharing strategy, regulates described second output current, makes described second output current consistent with described first output current.
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| CN106160013A (en) * | 2016-06-30 | 2016-11-23 | 温州大学 | The parallel operation system Lycoperdon polymorphum Vitt optimal control method that the expectation of a kind of current-sharing deviation is minimum |
| CN106160013B (en) * | 2016-06-30 | 2018-11-06 | 温州大学 | A kind of stream deviation it is expected the parallel operation system grey optimal control method of minimum |
| WO2018035810A1 (en) * | 2016-08-25 | 2018-03-01 | 深圳市大疆创新科技有限公司 | Card reader |
| CN112684874A (en) * | 2020-12-30 | 2021-04-20 | 联想(北京)有限公司 | Device and method for supplying power by multiple power supplies |
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