CN101340087A - DC parallel power distributing circuit based on pulse width distribution - Google Patents
DC parallel power distributing circuit based on pulse width distribution Download PDFInfo
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- CN101340087A CN101340087A CNA2008100408373A CN200810040837A CN101340087A CN 101340087 A CN101340087 A CN 101340087A CN A2008100408373 A CNA2008100408373 A CN A2008100408373A CN 200810040837 A CN200810040837 A CN 200810040837A CN 101340087 A CN101340087 A CN 101340087A
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Abstract
The invention discloses a power distributing circuit of direct current parallel power supply based on pulse width distribution and comprises a plurality of groups of power supply module groups which are connected with a parallel bus by switches; the parallel bus is connected with a power schottky diode to the ground in a parallel way; the parallel bus and an output end are serially connected with an inductor; after the output end is respectively connected with an electrolytic capacitor and a high frequency capacitor to the ground in a parallel way, the output is connected with the load; the circuit is also internally provided with a pulse width distributor which is connected with switches of each group of power supply modules; an output control signal of the pulse width distributor is used for controlling the make-break of switches of each group of power supply modules; the switches of each group of power supply modules are adjusted to control the duty cycles of pulse time width to distribute the output power (current) of each group of power supply modules. The distributing circuit is simple in realization and control, low in cost without the problem of parallel stability; the power (current) distribution is accurate; when modules with different capacities are connected in a parallel way, the output power (current) is distributed according to proportions with low requirements on internal impedance, and the like, of power supply modules.
Description
Technical field:
The present invention relates to a kind of DC parallel power distributor circuit, particularly a kind of DC parallel power distributor circuit that distributes based on pulse duration.
Background technology:
At present the distributed DC power-supply system has replaced traditional centralized DC power system, becomes the developing direction of large power, electrically origin system, this be because: separate unit large power supply capacity is subjected to the restriction of technology, cost; Separate unit DC power supply fault can cause the whole system fault, and distributed power supply system is composed in parallel by some power modules, and certain power module fault can not cause whole power system failure; Distributed power supply system can be according to the variation of actual load, determines the module number that the module number that need put into operation or off-the-line withdraw from automatically, and this for the occasion of variable load operation highly significant; Distributed power supply system is owing to a plurality of power module parallel runnings, and the electric stress that each power module is born is less, has higher running efficiency, and has better dynamic characteristic and static characteristic.
Yet the problem of parallel system maximum is exactly a current unevenness, particularly when heavy duty, can cause comparatively serious consequence, so the progress of parallel system flow equalize technology should be the bottleneck of Switching Power Supply standardization of application.
Current-sharing principle and method commonly used have following four kinds:
(1) output impedance method is Droop (sagging, as a to tilt) method;
Regulate the external characteristic gradient (promptly regulating output impedance) of each power module, to reach the purpose of blocks current in parallel or power division.External characteristic is introduced the output current negative feedback by the voltage given of voltage close loop, and promptly output current increases, and voltage given reduces.The electric current of each power module distributes by the external characteristic realization of translation power module.Circuit system and software more complicated, control algolithm and parameter are provided with the stability influence of system very big.
(2) principal and subordinate's method;
Be applicable in the DC parallel power-supply system of current-mode control.Two kinds of patterns of voltage control and Current Control are arranged in this system power or the power division, and compose in parallel by a primary module and a plurality of sub-module.Primary module works in voltage close loop, plays the system voltage regulating action; Sub-module works in current closed-loop, plays bearing power (electric current) and distributes.Equally, circuit system and software more complicated, control algolithm and parameter are provided with the stability influence of system very big.In addition, in case the primary module fault, thrashing.
(3) mean value current-equalizing method;
On resistance to one common bus of the output termination of each module in parallel, form the mean value bus.When certain module voltage was higher than busbar voltage, output voltage descended, and vice versa.This method requires on identical resistance to one common bus of the fast output termination of each mould, in fact also there is internal resistance in module self, and internal resistance may vary with temperature, so the current-sharing poor effect, simultaneously, output is linked resistance on the common bus system effectiveness is reduced.
(4) maximum current-equalizing method;
Similar with the mean value current-equalizing method, difference just each power module is linked on the common bus by a diode.That module of electric current maximum becomes primary module automatically, and other modules are from module, thereby " principal and subordinate's control automatically ".The output current of each power module can't be determined in this parallel system, can not realize real current-sharing, can only realize power supply redundancy.
In order to eliminate the shortcoming that present DC power supply parallel system electric current or power distribution method exist, the present invention proposes a kind of new method, i.e. DC parallel source current or the power distributing circuit that distributes based on pulse duration.
Summary of the invention:
Technical problem to be solved by this invention is to provide a kind of DC parallel power distributor circuit, this circuit is realized simple, control is simple, with low cost, there is not stability problem in parallel, power (electric current) distributes accurately, and power output (electric current) pro-rata when in parallel of different capabilities module, and is less demanding to the characteristics such as internal impedance of power module.
Technical problem to be solved by this invention can be achieved through the following technical solutions:
A kind of DC parallel power distributor circuit that distributes based on pulse duration comprises that plural groups links power module group on the parallel bus by switch; Parallel bus over the ground and connect a power schottky diode (or fast recovery diode); Parallel bus and output tandem electric inductance; Output respectively and after connecing electrochemical capacitor and high frequency capacitance, connects load with output over the ground again.Also be provided with connection in the described circuit and respectively organize the pulse duration distributor of switch of the power supply module, the output control signal of pulse duration distributor is used for controlling the break-make of respectively organizing switch of the power supply module.
Because the present invention adopts each power module to link on the parallel bus through a control switch respectively, each control switch conducting official hour in turn in a time cycle, thus electric current or the power of realizing each power module in the DC power supply parallel system accurately distribute.
The present invention eliminated that present DC power supply parallel system electric current or power distribution method exist such as the circuit complexity, the algorithm complexity, stable poor, electric current or power division poor performance, shortcomings such as cost height.The present invention realizes simply, and control is simple, and is with low cost, do not have stability problem in parallel, and power (electric current) distributes accurately, and power output (electric current) pro-rata when in parallel of different capabilities module, and is less demanding to the characteristics such as internal impedance of power module.
Description of drawings:
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 1, DC parallel power distributor circuit of the present invention in an embodiment, M1, M2, M3 ... MN is respectively a power module; S1, S2, S3 ... SN is the output switch of each power module; Each power module is linked on the parallel bus by output switch separately; A plurality of output control signal K1 of pulse duration distributor, K2, K3 ... KN is control switch S1, S2, S3 respectively ... the break-make of SN; D is power schottky diode or fast recovery diode; L is an inductance; C1 is an electrochemical capacitor; C2 is a high frequency capacitance; Electric capacity output connects load.For impulse current and the switch that suppresses switch conduction switches the output ripple that causes in turn, inductance L is set, diode D, capacitor C 1, C2 play buffering and filter action.
Below be the realization principle of foregoing circuit:
Suppose to have N DC power supplier parallel connection, the capacity of each module is respectively P1, P2, and P3 ..., PN,
Parallel connection power supply total load power P, then the desirable power division of each module should be:
Module 1 power: W1=P1*P/ (P1+P2+P3+ ... + PN)
Module 2 power: W2=P2*P/ (P1+P2+P3+ ... + PN)
Module 3 power: W3=P3*P/ (P1+P2+P3+ ... + PN)
/…
Module N power: WN=PN*P/ (P1+P2+P3+ ... + PN)
Each power module is passed through switch S 1 respectively, S2, S3 ..., SN is connected in the load, and each switch wheel conductance is logical, if the cycle is T in turn, output switch control signal K1, K2, K3 ..., each switch conduction time of period T inner control is respectively T1 to KN in turn at one, T2, T3 ..., TN then has:
T1＝P1*T/(P1+P2+P3+…+PN)
T2＝P2*T/(P1+P2+P3+…+PN)
T3＝P3*T/(P1+P2+P3+…+PN)
/…
TN＝PN*T/(P1+P2+P3+…+PN)
If each power module capacity is identical, the control signal K1 of pulse duration distributor output then, K2, K3 ..., width effective time of KN equates, and is T/N.
Obviously, by in the one-period time T, the switch of each power module correspondence being pressed ON time of power supply capacity pro rate, can realize simply at low cost accurately that power division or electric current distribute.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (2)
1, the DC parallel power distributor circuit that distributes based on pulse duration comprises that plural groups links power module group on the parallel bus by switch; Parallel bus over the ground and connect a power schottky diode; Parallel bus and output tandem electric inductance; Output respectively and after connecing electrochemical capacitor and high frequency capacitance, connects load with output over the ground again; It is characterized in that, also be provided with connection in the described circuit and respectively organize the pulse duration distributor of switch of the power supply module, the output control signal of pulse duration distributor is used for controlling the break-make of respectively organizing switch of the power supply module, respectively organizes switch of the power supply module control impuls time width duty by adjusting and recently distributes power output or the output current of respectively organizing power module.
According to the DC parallel power distributor circuit of claim 1, it is characterized in that 2, the power schottky diode in the described circuit can also substitute with fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100408373A CN101340087A (en) | 2008-07-22 | 2008-07-22 | DC parallel power distributing circuit based on pulse width distribution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100408373A CN101340087A (en) | 2008-07-22 | 2008-07-22 | DC parallel power distributing circuit based on pulse width distribution |
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| CN101340087A true CN101340087A (en) | 2009-01-07 |
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| CNA2008100408373A Pending CN101340087A (en) | 2008-07-22 | 2008-07-22 | DC parallel power distributing circuit based on pulse width distribution |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917008A (en) * | 2010-07-29 | 2010-12-15 | 中兴通讯股份有限公司 | Method and device for improving specific proportion load efficiency of power source |
| CN102751717A (en) * | 2012-07-20 | 2012-10-24 | 白远超 | Multichannel power parallel input processing method and system |
| CN109787214A (en) * | 2019-01-24 | 2019-05-21 | 东南大学 | Energy source router and its Control System of Load Distribution method based on direct-current grid inverter |
| CN110518564A (en) * | 2019-07-31 | 2019-11-29 | 广东浪潮大数据研究有限公司 | A kind of server output power distribution method and device |
| CN112366927A (en) * | 2020-11-13 | 2021-02-12 | 珠海格力电器股份有限公司 | Control method and structure for switch power supply without communication parallel connection |
-
2008
- 2008-07-22 CN CNA2008100408373A patent/CN101340087A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917008A (en) * | 2010-07-29 | 2010-12-15 | 中兴通讯股份有限公司 | Method and device for improving specific proportion load efficiency of power source |
| WO2012013099A1 (en) * | 2010-07-29 | 2012-02-02 | 中兴通讯股份有限公司 | Method for improving specific proportion load efficiency of power supply and apparatus thereof |
| CN101917008B (en) * | 2010-07-29 | 2014-11-05 | 中兴通讯股份有限公司 | Method and device for improving specific proportion load efficiency of power source |
| CN102751717A (en) * | 2012-07-20 | 2012-10-24 | 白远超 | Multichannel power parallel input processing method and system |
| CN102751717B (en) * | 2012-07-20 | 2015-06-24 | 白远超 | Multichannel power parallel input processing method and system |
| CN109787214A (en) * | 2019-01-24 | 2019-05-21 | 东南大学 | Energy source router and its Control System of Load Distribution method based on direct-current grid inverter |
| CN110518564A (en) * | 2019-07-31 | 2019-11-29 | 广东浪潮大数据研究有限公司 | A kind of server output power distribution method and device |
| CN112366927A (en) * | 2020-11-13 | 2021-02-12 | 珠海格力电器股份有限公司 | Control method and structure for switch power supply without communication parallel connection |
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Open date: 20090107 |