CN104052050A - Power source parallel system employing current limit control - Google Patents
Power source parallel system employing current limit control Download PDFInfo
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- CN104052050A CN104052050A CN201310077810.2A CN201310077810A CN104052050A CN 104052050 A CN104052050 A CN 104052050A CN 201310077810 A CN201310077810 A CN 201310077810A CN 104052050 A CN104052050 A CN 104052050A
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Abstract
The invention relates to a power source parallel system employing current limit control. The system is mainly used for distributing output currents of multiple parallel power source modules, so each power source module supplies power for a load according distributed output current, and an output voltage of the load can be controlled; partial power source modules supply power for the loads in light load, and system efficiency is improved; through the system, parallel use of the power source modules having same voltages and different currents can be realized, and a parallelable number of the power source modules is not limited.
Description
Technical field
The present invention relates to a kind of power supply parallel system that adopts Current limited Control, refer to especially a kind of to the power module execution output current Current limited Control in power supply parallel system, to improve system effectiveness and to support identical voltage, different current and power supply modules correlation technique parallel with one another.
Background technology
For guaranteeing stability and the reliability of power-supply system power supply, existing power-supply system is mostly by power supply apparatus modularization, and makes to adopt the power module of same specification series parallel with one another, to improve fan-out capability.And existing parallel technology mainly contains two classes, one is active current-equalizing method (Active Current-Sharing Method), another is voltage drop method (Droop Method), and alleged active current-equalizing method comprises average current method (Average current Method), direct principal and subordinate's method (Dedicated Master Method) and automatic principal and subordinate's method (Automatic Master Method).Above two class parallel technologies are all that to reach current-sharing be object.
But as described in front taking off, adopting a plurality of power module parallel connections is mainly in order to improve fan-out capability, although and voltage drop method can reach current-sharing object, reduced output voltage and necessary adjustment capability of sacrificing output voltage, obviously failed to agree with the object that improves fan-out capability.And if each power module reaches current-sharing, load is no matter be underloading or heavy duty, and each power module in parallel system must work, and each power module exports identical electric current, thereby under light condition, system running efficiency is obviously on the low side.
Moreover, both take current-sharing as object, meaning i.e. all power modules of parallel connection must be all identical voltage, same current, if user has identical voltage but the power module of different electric currents, reaching under the prerequisite of current-sharing, the power module of different electric currents cannot add parallel system, forms the waste of available resources.
From the above, parallel system is powered after with a plurality of power module parallel connections, mainly improving fan-out capability, though although take voltage drop method can reach current-sharing object, but fan-out capability reduces, so how to guarantee that system stability does not affect again fan-out capability, need to be further reviewed in fact, and seek feasible solution.
Summary of the invention
Therefore main purpose of the present invention is providing a kind of power supply parallel system that adopts Current limited Control, mainly each power module in power supply parallel system to be carried out to output current distribute, make each power module according to the output current supply power supply being assigned to, and according to load state, determine to drop into the power module quantity of power supply, with elevator system running efficiency.Because being distributes its output current to each power module, so each power module can be different electric currents, and then can support identical voltage but the power module of different electric currents is parallel with one another, and power module quantity in parallel is unrestricted.
For reaching the technical way that aforementioned object takes, be to make the power supply parallel system of aforementioned employing Current limited Control comprise:
A plurality of servant's modules, each servant's module has respectively a transducer and a Current limited Control unit, and this transducer has an output, and is jointly connected to an output bus; This Current limited Control unit is set with a maximum output current, and is connected to obtain load current with output bus, and produces according to this current limliting order to limit output current, and by transducer, the output current limiting is loaded into output bus;
One primary module, in parallel with the aforementioned module of respectively falling forward, and be connected with output bus, with the load voltage of feedbacking according to output bus, output voltage is made to determine voltage control;
The power supply parallel system of aforementioned employing Current limited Control is mainly the load of sharing output bus by master, servant's module, but do not share out equally, but the maximum output current of being set according to its Current limited Control unit by servant's module, primary module and load current size, be loaded in order output bus, namely by each servant's module, primary module, sequentially with maximum output current, be loaded into one by one output bus, until load current is satisfied.Under this situation, the power module quantity that is loaded into output bus is the light heavy load condition of apparent load and determining, if heavy condition, add power module quantity in parallel many, if light condition, add power module quantity in parallel relatively to reduce, namely do not need to allow all power module all work, with this, can improve running efficiency.And according to the Current limited Control technology of aforementioned system, the power module of the different electric currents of tolerable (capacity) is added to parallel system, fully to use resource, and improve system combination elasticity.
For reaching the another major technique that aforementioned object takes, be to make the power supply parallel system of aforementioned employing Current limited Control comprise:
One primary module, comprises a transducer, a Current limited Control unit and a voltage controller, and this transducer has an output, and is jointly connected to an output bus; This Current limited Control unit has an output and an output current control end, and its output is connected with transducer; This voltage controller has a control signal output, is to be connected with the output current control end of Current limited Control unit;
A plurality of servant's modules, each servant's module has respectively a transducer and a Current limited Control unit, and this transducer has an output, and is jointly connected to an output bus; This Current limited Control unit has an output and an output current control end, its output is connected with transducer, and its output current control end is connected with output current control end with the output of the Current limited Control unit of adjacent servant's module or primary module by an arithmetic unit;
The load that the power supply parallel system of aforementioned employing Current limited Control is still shared output bus by master, servant's module, its allocation way is the output current by primary module control itself and each servant's module, and is sequentially loaded into output bus.Under this situation, the visual load state of power module quantity that is loaded into output bus determines.
The useful technique effect of technique scheme of the present invention is: because the output current of current limliting power module is to be distributed and controlled by primary module, therefore the power module of the different electric currents of tolerable (capacity) adds parallel system, fully to use resource, and improve system combination elasticity.
Accompanying drawing explanation
Fig. 1 is system architecture block diagram of the present invention;
Fig. 2 is the system block diagram of a preferred embodiment of the present invention;
Fig. 3 is the system block diagram of the another preferred embodiment of the present invention.
Embodiment
Below coordinate preferred embodiment graphic and of the present invention, further setting forth the present invention is to reach the technological means that predetermined goal of the invention is taked.
System basic framework and operation principle about a preferred embodiment of the present invention, please refer to shown in Fig. 1, be mainly to make a plurality of power module 10A, 10B, 10C, 10D jointly be connected to an output bus L with its output, and be connected (in figure, the quantity of power module is only example) with load by output bus L.
Operation principle of the present invention is: each power module 10A, 10B, 10C, 10D are the maximum output current I according to a setting
oMwith the load current I on output bus L
loutput current I while determining whether loading and loading
o1, I
o2, I
o3, I
o4, for example, at load current, be 10 ampere-hours, if set the maximum output current I of each power module 10A, 10B, 10C, 10D
oMbe respectively 4 amperes, under full load condition, the output current I of two power module 10A, 10B
o1, I
o2all maximum output current I
oM, the output current I of another power module 10C
o3need only 2 amperes, the output current I of last power module 10D
o4be 0.If light condition, load current is 4 ampere-hours, need only with maximum output current, be loaded into output bus L above by a power module 10A, and the output current I of other power module 10B, 10C, 10D
o2, I
o3, I
o4be 0.
About above-mentioned each power module 10A, 10B, 10C, 10D, its concrete structure please refer to shown in Fig. 2:
Aforementioned power source module 10A, 10B, 10C have identical basic framework, are respectively as servant's module, and another power module 10D, except possessing the basic framework identical with servant's module 10A, 10B, 10C, further comprises a voltage controller; About the structure of aforementioned servant's module 10A, 10B, 10C, hold with servant's module 10A wherein its structure is described, it comprises:
One transducer 11, has an output and a control end, and its output is connected with output bus L;
One Current limited Control unit 12, has an output, a local current input terminal i
o1with a bus current input i
l1, its output is connected with the control end of transducer 11, its local current input terminal i
o1be connected with the output of transducer 11, to obtain the output current of itself; And its bus current input i
l1to be connected with output bus L; This Current limited Control unit 12 is set with a maximum output current I
oM, and according to bus current input i
l1the load current of back coupling input, to produce a current limliting order, makes transducer 11 control its output current I
o1.
In the present embodiment, this Current limited Control unit 12 comprises a current limliting order generator 121 and a current controller 122; The input of this current limliting order generator 121 is to form aforementioned bus current input i
l1, and be connected with output bus L, to obtain the load current of back coupling, and produce according to this current limliting order, then deliver to current controller 122, by current controller 122, controlled the output current I of transducer 11
o1.
And aforementioned primary module 10D is except possessing aforementioned transducer 11 and Current limited Control unit 12, further comprise a voltage controller, this voltage controller 13 has an input, one output and a voltage commands input, its input is connected with output bus L, to feedback output voltage, its output is connected with the current limliting order generator 121 of Current limited Control unit 12, this voltage controller according to a voltage commands of voltage commands input and the output voltage of feedbacking from output bus L to produce a control signal, and deliver to current limliting order generator 121, in order to load is carried out to voltage control.
Above-mentioned respectively fall forward module 10A, 10B, 10C, primary module 10D be its output current of control piecemeal, below only with example, illustrates:
Please coordinate with reference to shown in figure 1, Fig. 2, as load current I
ldemand be 10 ampere-hours, servant's module 10A, 10B, 10C, primary module 10D drop into output bus L, the load current I that first servant's module 10A obtains from output bus L back coupling with maximum output current respectively
l1be 10 amperes, and maintain maximum output current; Second load current I that servant's module 10B obtains from output bus L back coupling
l26 amperes of (I
l2=I
l1-I
o1), so also maintain maximum output current; The 3rd the load current I that servant's module 10C obtains from output bus L back coupling
l32 amperes of (I
l3=I
l2-I
o2), therefore the 3rd power module 10C will adjust its output current I
o3it is 2 amperes.The output current that drops into output bus L due to first three servant's module 10A, 10B, 10C has met load current I
ldemand, so load current I of obtaining from output bus L back coupling of primary module 10D
l4be 0, therefore its output current I
o4also be 0.
By above-mentioned respectively fall forward module 10A, 10B, 10C, primary module 10D, all make Current limited Control (CC), stable for guaranteeing power supply, so that primary module 10D the output voltage of parallel system is carried out and is determined voltage control (CV), therefore above-mentioned servant's module 10A, 10B, 10C are current limliting power module, and primary module 10D is voltage limited power source module.
About another preferred embodiment of the present invention, please refer to shown in Fig. 3, its basic framework and last embodiment are roughly the same, difference is in: each output current of falling forward module 10A, 10B, 10C and is determined according to the load current of feedbacking by itself, but is directly or indirectly controlled by primary module 10D.Concrete structure as described below:
Current limliting order generator 121A～121C of each fall forward module 10A, 10B, 10C does not connect output bus L, but by an arithmetic unit 14A～14C, is connected with the current limliting order generator 121 of adjacent servant's module 10B, 10C, primary module 10D respectively;
Current limliting order generator 121A～121D of each fall forward module 10A, 10B, 10C and primary module 10D has respectively an output current control end ioA～ioD, the output current control end ioD of current limliting order generator 121D and the control signal output of voltage controller 13 of this primary module 10D are connected, the current limliting order output terminal of current limliting order generator 121D, output current control end ioD, except being connected with current controller 122D, voltage controller 13 respectively, are connected respectively to again the arithmetic unit 14C of adjacent servant's module 10C.
Each arithmetic unit 14A～14C has respectively an output and two parameter ends, output current control end ioA～ioC of current limliting order generator 121A～121C of its output and servant's module 10A, 10B, 10C itself is connected, and two parameter ends are connected with adjacent servant's module 10B, 10C or current limliting order generator 121B, the current limliting order output terminal of 121C, 121D, the output current control end ioB～ioD of primary module 10D respectively.
Meaning is that each servant's module 10A, output current Io1, the Io2 of 10B, 10C, Io3 are controlled by current limliting order generator 121B, 121C, the 121D of adjacent servant's module 10B, 10C or primary module 10D respectively.
Specific works mode is in detail as described below: when the current limliting order generator 121D of primary module 10D obtains load current demand by voltage controller 13, be 10 ampere-hours, its current limliting order generator 121D for example, gives current controller 122D by the current limliting order (4 amperes) of sending maximum output current, make 4 amperes of transducer 11D output maximum currents, because load current demand is 10 amperes, the current limliting order of current limliting order generator 121D is 4 amperes, by its difference of arithmetic unit 14C computing, the load current demand that offers the current limliting order generator 121C of adjacent servant's module 10C is 6 amperes, now, the current limliting order that its current limliting order generator 121C will send maximum output current, to current controller 122C, makes 4 amperes of transducer 11C output maximum currents, and so far, the electric current on output bus L is 8 amperes.And the load current demand that primary module 10D sends servant's module 10C is 6 amperes, the current limliting order of its current limliting order generator 121C is 4 amperes, by its difference of arithmetic unit 14B computing, the load current demand that offers the current limliting order generator 121B of another adjacent servant's module 10B is 2 amperes, the current limliting order generator 121B of the module of now falling forward 10B need only send the current limliting order of 2 amperes, makes transducer 11B load 2 amperes of output currents to output bus L.So far the electric current on output bus L has reached 10 amperes, servant's module 10B will be 0 to the load current demand of adjacent servant's module 10A again, that is the current limliting order that the current limliting order generator 121A of servant's module 10A sends to transducer 11A is 0, thereby do not need loading current to output bus L.
From the above, power supply parallel system of the present invention is mainly the load of sharing output bus by each current limliting power module, but do not share out equally, but the controlled loading of the maximum output current of being set according to its Current limited Control unit by each current limliting power module and load current size or primary module is to output bus.Under this situation, be loaded into the light heavy load condition that the current limliting power module quantity of output bus can apparent load and determine, if heavy condition, add current limliting power module quantity in parallel many, if light condition, add current limliting power module quantity in parallel relatively to reduce, namely not necessarily need whole current limliting power modules all to work, thereby can improve running efficiency.
No matter and be set maximum output current or controlled by primary module, Current limited Control technology according to aforementioned system of the present invention, the power module of the identical voltage of tolerable, different electric current (capacity) is added to parallel system, with this, can improve the elasticity of system combination, and can make full use of resource.
Moreover aforesaid each power module can be DC power supply, it can be also AC power supply.Therefore can be applied in respectively DC power supply parallel system or AC power parallel system.
Servant's module number in above-mentioned execution mode and accompanying drawing and label are only understood with being convenient to for convenience of description, not in order to limit the quantity of its actual use.
The above is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any relevant technical staff in the field, within not departing from the scope of the claims in the present invention book, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from the claims in the present invention book, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of the claims in the present invention.
Claims (11)
1. a power supply parallel system that adopts Current limited Control, is characterized in that, comprising:
A plurality of servant's modules, each servant's module has respectively a transducer and a Current limited Control unit, and described transducer has an output, and is jointly connected to an output bus; Described Current limited Control unit is set with a maximum output current, and is connected to obtain load current with output bus, and produces according to this current limliting order to limit output current, and by transducer, the output current limiting is loaded into output bus;
One primary module, in parallel with the aforementioned module of respectively falling forward, and be connected with output bus, with the load voltage of feedbacking according to output bus, output voltage is made to determine voltage control.
2. the power supply parallel system that adopts according to claim 1 Current limited Control, is characterized in that, described primary module has a transducer and a Current limited Control unit, and described transducer has an output and is connected to output bus; Described Current limited Control unit is set with a maximum output current, and is connected to obtain load current with output bus, and produces according to this current limliting order to limit output current, and by transducer, the output current limiting is loaded into output bus.
3. the power supply parallel system that adopts according to claim 2 Current limited Control, is characterized in that, described master, servant's module are DC power supply.
4. the power supply parallel system that adopts according to claim 2 Current limited Control, is characterized in that, described master, servant's module are AC power supply.
5. according to the power supply parallel system that adopts Current limited Control described in any one in claim 1 to 4, it is characterized in that, the Current limited Control unit of described master, servant's module comprises a current limliting order generator and a current controller, the input of described current limliting order generator is connected with output bus, to obtain the load current of back coupling, by current limliting order generator, produce a current limliting order and give current controller, by current controller, controlled the output current of transducer.
6. adopt according to claim 5 the power supply parallel system of Current limited Control, it is characterized in that, the voltage controller of described primary module has an input, an output and a voltage commands input, its input is connected with output bus, and the current limliting order generator of its output and Current limited Control unit is connected.
7. a power supply parallel system that adopts Current limited Control, comprising:
One primary module, comprises a transducer, a Current limited Control unit and a voltage controller, and described transducer has an output, and is jointly connected to an output bus; Described Current limited Control unit has an output and an output current control end, and its output is connected with transducer; Described voltage controller has a control signal output, is to be connected with the output current control end of Current limited Control unit;
A plurality of servant's modules, each servant's module has respectively a transducer and a Current limited Control unit, and described transducer has an output, and is jointly connected to an output bus; Described Current limited Control unit has an output and an output current control end, its output is connected with transducer, and its output current control end is connected with output current control end with the output of the Current limited Control unit of adjacent servant's module or primary module by an arithmetic unit.
8. adopt according to claim 7 the power supply parallel system of Current limited Control, it is characterized in that, the Current limited Control unit of described servant, primary module 10A, 10B, 10C, 10D has respectively a current controller 122A～122D and a current limliting order generator 121A～121D, and its current controller 122A～122D is connected with transducer 122A～122D of servant, primary module 10A, 10B, 10C, 10D respectively;
Current limliting order generator 121A～121D of described servant, primary module 10A, 10B, 10C, 10D has respectively an output current control end ioA～ioD, the output current control end ioD of the current limliting order generator 121D of described primary module 10D and the control signal output of voltage controller are connected, and current limliting order output terminal, the output current control end ioD of current limliting order generator 121D are connected with current controller 122D, voltage controller respectively;
Each arithmetic unit 14A～14C has respectively an output and two parameter ends, output current control end ioA～ioC of current limliting order generator 121A～121C of its output and servant's module 10A, 10B, 10C is connected, and two parameter ends are connected with adjacent servant's module 10B, 10C or current limliting order generator 121B, the current limliting order output terminal of 121C, 121D, the output current control end ioB～ioD of primary module 10D respectively.
9. the power supply parallel system that adopts according to claim 8 Current limited Control, is characterized in that, described master, servant's module are DC power supply.
10. the power supply parallel system that adopts according to claim 8 Current limited Control, is characterized in that, described master, servant's module are AC power supply.
The power supply parallel system that adopts Current limited Control according to Claim 8 in 11. to 10 described in any one, is characterized in that, described primary module is carried out and determined voltage control output voltage simultaneously.
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| CN106685215A (en) * | 2016-11-17 | 2017-05-17 | 深圳市拓革科技有限公司 | DC-to-DC converter parallel group and control method thereof |
| TWI611282B (en) * | 2017-01-03 | 2018-01-11 | 友達光電股份有限公司 | Power Supply Circuit And Power Supplying Method |
| CN108068638A (en) * | 2016-11-16 | 2018-05-25 | 台达电子工业股份有限公司 | Electric car charging equipment and charging method |
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Application publication date: 20140917 |