CN112260515A - Method and circuit for maintaining constant power output of multiple power supply modules and power supply module - Google Patents

Method and circuit for maintaining constant power output of multiple power supply modules and power supply module Download PDF

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Publication number
CN112260515A
CN112260515A CN202011041913.XA CN202011041913A CN112260515A CN 112260515 A CN112260515 A CN 112260515A CN 202011041913 A CN202011041913 A CN 202011041913A CN 112260515 A CN112260515 A CN 112260515A
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CN
China
Prior art keywords
current
output
power
power supply
supply module
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Pending
Application number
CN202011041913.XA
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Chinese (zh)
Inventor
倪超
王舸
赵志多
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Leihua Electronic Technology Research Institute Aviation Industry Corp of China
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Leihua Electronic Technology Research Institute Aviation Industry Corp of China
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Priority to CN202011041913.XA priority Critical patent/CN112260515A/en
Publication of CN112260515A publication Critical patent/CN112260515A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • 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
    • 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
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits

Abstract

The application provides a method for keeping constant power output of a plurality of power supply modules, which comprises the following steps: acquiring output current of each power supply module in a plurality of power supply modules; judging the relation between the current output current of the power supply module and the rated current; when the output current is not greater than the rated current, the current power supply module outputs at a constant voltage; when the output current is larger than the rated current, the output voltage of the current power supply module is reduced, the output current of the current power supply module is increased, and the current power supply module outputs the current power supply module with constant power, so that the constant power output can be realized when a plurality of power supply modules are connected in parallel for output. The method provided by the application does not increase the complexity of the power supply module, and can realize passive current sharing by only changing the output characteristic of the power supply module, thereby improving the load regulation rate index of passive current sharing, sharing the internal control loop bandwidth of the power supply module when in parallel application, and improving the dynamic response capability during the period of periodic pulse load.

Description

Method and circuit for maintaining constant power output of multiple power supply modules and power supply module
Technical Field
The application belongs to the technical field of switching power supplies, and particularly relates to a method and a circuit for keeping constant power output of multiple power supply modules, and a power supply module.
Background
In a power supply occasion with high reliability, the parallel application of the power supply modules can not only expand power, but also realize redundant backup to obtain high reliability. The parallel application of the power modules needs to meet certain conditions, otherwise, the power modules participating in the parallel application can generate circulation currents or the load cannot be reasonably distributed, and the parallel failure is caused. The method for restraining the circulating current is generally ensured by the unidirectional power output characteristic of the power module, and the reasonable load distribution is realized by current sharing control. The current sharing control is generally divided into active current sharing and passive current sharing, the passive current sharing utilizes the droop characteristic that the output voltage of a power module decreases along with the increase of a load, the operation is simple and reliable, but the load distribution difference increases along with the increase of the load, and the load regulation rate index of parallel application is greatly reduced; active current sharing requires that a power supply module has certain circuit support, so that the complexity of a circuit is increased, the control bandwidth of the active current sharing is low, and the application of periodic pulse load is limited.
Therefore, there are some disadvantages in any current sharing method.
Disclosure of Invention
It is an object of the present application to provide a method, circuit and power module for maintaining constant power output of multiple power modules, which solves or reduces at least one of the problems of the background art.
In a first aspect, the technical solution provided by the present application is: a method of maintaining constant power output from multiple power supply modules, the method comprising:
acquiring output current of each power supply module in a plurality of power supply modules;
judging the relation between the current output current of the power supply module and the rated current;
when the output current is not greater than the rated current, the current power supply module outputs at a constant voltage; when the output current is larger than the rated current, the output voltage of the current power supply module is reduced, the output current of the current power supply module is increased, and the current power supply module outputs the output current at constant power, so that the constant power output can be realized when a plurality of power supply modules are connected in parallel for output.
Further, the maximum output current of the current power supply module does not exceed the maximum current value of the current power supply module.
Further, the lowest output voltage of the current power supply module is not lower than the minimum voltage of the current power supply module.
In a second aspect, the present application provides the following technical solutions: a circuit for maintaining constant power output from a plurality of power modules, said circuit comprising: power converter, current regulation circuit and constant power regulating circuit, wherein:
the power converter is used for converting the output current of the current regulating circuit into preset output voltage and output current so as to achieve preset output power;
the current regulating circuit is used for acquiring the output current of the constant power regulating circuit and regulating the output current of the constant power regulating circuit;
the constant power regulating circuit is used for regulating the output voltage and the output current of the control power converter according to the output voltage and/or the output current of the power converter, wherein when the output current of the power converter is not greater than the rated current of the power module, the control power converter is controlled to carry out constant voltage output; when the output current of the power converter is larger than the rated current, the power converter is controlled to reduce the output voltage and improve the output current so as to output constant power.
Further, the output current of the power converter does not exceed the current maximum value of the current power supply module at most.
Further, the lowest output voltage of the power converter is not lower than the minimum voltage of the current power supply module.
In a final aspect, the present application provides the following technical solutions: a power supply module comprising a circuit as claimed in any preceding claim for maintaining constant power output from multiple power supply modules.
The method provided by the application does not increase the complexity of the power supply module, and can realize passive current sharing by only changing the output characteristic of the power supply module, thereby improving the load regulation rate index of passive current sharing, sharing the internal control loop bandwidth of the power supply module when in parallel application, and improving the dynamic response capability during the period of periodic pulse load.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
Fig. 1 is a flow chart of a method for maintaining constant power output of multiple power supplies according to the present application.
Fig. 2 is a schematic diagram of a power supply module with wide constant power region in the present application.
Fig. 3 is a graph of output volt-ampere of a power module in a wide constant power region according to the present application.
Fig. 4 is a block diagram of a parallel power supply architecture in a distributed configuration according to an embodiment of the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1, the method for maintaining constant power output of multiple power modules provided by the present application includes the following steps:
s1, acquiring the output current of each power supply module in the plurality of power supply modules;
s2, judging the relation between the current output current of the power supply module and the rated current;
s3, when the output current is not larger than the rated current, the current power supply module outputs at a constant voltage; when the output current is larger than the rated current, the output voltage of the current power supply module is reduced, the output current of the current power supply module is increased, and the current power supply module outputs the current power supply module with constant power, so that the constant power output can be realized when a plurality of power supply modules are connected in parallel for output.
In one embodiment implementing the above method, the present application provides a circuit for maintaining constant power output of multiple power supply modules, the circuit being disposed in each power supply module.
As shown in fig. 2, the circuit 10 for maintaining constant power output of multiple power modules provided by the present application includes: constant power regulating circuit 11, current regulating circuit 12 and power converter 13. The input signal of the constant power regulating circuit 11 is voltage feedback, the constant power regulating circuit calculates the output power of the current power module in real time, and when the output power is lower than the rated power, the power regulating circuit is saturated and is converted into constant voltage regulation. The output of the constant power regulating circuit 13 is a current reference. The current regulating circuit 12 is configured to regulate the feedback current of the power supply module cycle by cycle, so as to implement constant voltage or constant power output. The power converter 13 is identical to the power converter inside a conventional power supply module.
When the power supply module works independently, when the output current is not more than the rated current, the power supply module works in a constant voltage state; when the output current is larger than the rated current, the power supply module works in a constant power state, and the product of the output voltage and the output current of the power supply module is kept unchanged until the power supply module enters overcurrent protection.
When the power modules work in parallel, when the output current of each power module is not greater than the respective rated current, namely all the power modules do not enter a constant power region, the load current of the power modules participating in the parallel connection is automatically distributed according to the respective internal resistance, the power modules participating in the parallel connection work in a constant voltage state, and the load regulation rate index is consistent with the load regulation rate index of the single power module; when the power modules participating in parallel connection do not completely enter a constant power state, the voltage of the bus connected in parallel and output is determined by the power module in a constant voltage state, the power module entering the constant power state is clamped at a rated output voltage because of the voltage of the bus, an active current equalizing circuit does not exist for adjusting the output voltage, the loop bandwidth applied in parallel is consistent with the control loop bandwidth of the power module, and the dynamic response capability during the period of periodic pulse load is improved.
As shown in fig. 3, when the load power increases from left to right, the power supply modules output power (P1, P2) in a constant voltage state, and when the load continues to increase when the load reaches full power (P3), the power supply modules decrease the voltage and increase the current to output constant power (P4, P5), and the insufficient power is supplemented by the other power supply modules connected in parallel.
The non-output of the single power supply module can cause the overcurrent of other power supply modules, and the overcurrent protection of an actual product can cause the disassembly of the power supply system.
The distributed parallel power supply architecture formed by the power modules expanding the constant power region can realize N + M redundant power supply, the direct current conversion module entering the constant power working region can stably work in a full load state on the premise that the system power capacity is not lower than the load power demand, and a certain load regulation rate is maintained.
The load regulation rate index of the passive parallel application is improved by changing the output characteristic of the power module, the control loop bandwidth is consistent with that of the power module in the parallel application, and the dynamic response capability of the periodic pulse load is improved.
In the embodiment of fig. 4 in which nine power modules D1-D9 are connected in parallel to output, when the power module D5 is damaged, the current of the power module D9 close to the power module D5 becomes large, and when it exceeds the full load current, overcurrent protection occurs without outputting power. Since the circuit module D5 does not output power, the same thing happens to the power module D1 close to the power module D5, that is, the current of the power module D1 increases, overcurrent protection occurs, and power is not output, and the same happens to the power modules D6-D8, which finally leads to the disassembly of the whole power system.
Therefore, the whole power supply system can be divided into nine power supply areas, each area comprises one power supply module, a corresponding load and the like, a distribution network between the power supply module and the load is consistent with a traditional distribution network, and local capacitive energy storage and electric energy conduction distribution can be realized; the power modules are connected by adopting bus bars, and different direct current conversion modules are provided with one and only one bus path. The power supply module can avoid the disassembly of the power supply system.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (7)

1. A method for maintaining constant power output from multiple power modules, the method comprising:
acquiring output current of each power supply module in a plurality of power supply modules;
judging the relation between the current output current of the power supply module and the rated current;
when the output current is not greater than the rated current, the current power supply module outputs at a constant voltage; when the output current is larger than the rated current, the output voltage of the current power supply module is reduced, the output current of the current power supply module is increased, and the current power supply module outputs the output current at constant power, so that the constant power output can be realized when a plurality of power supply modules are connected in parallel for output.
2. The method of maintaining constant power output from multiple power supply modules of claim 1, wherein the current output current of the present power supply module does not exceed the current maximum of the present power supply module at the most.
3. The method of maintaining constant power output from multiple power modules as claimed in claim 1, wherein the minimum output voltage of the current power module is not lower than the minimum voltage of the current power module.
4. A circuit for maintaining constant power output from a plurality of power modules, said circuit comprising: power converter, current regulation circuit and constant power regulating circuit, wherein:
the power converter is used for converting the output current of the current regulating circuit into preset output voltage and output current so as to achieve preset output power;
the current regulating circuit is used for acquiring the output current of the constant power regulating circuit and regulating the output current of the constant power regulating circuit;
the constant power regulating circuit is used for regulating the output voltage and the output current of the control power converter according to the output voltage and/or the output current of the power converter, wherein when the output current of the power converter is not greater than the rated current of the power module, the control power converter is controlled to carry out constant voltage output; when the output current of the power converter is larger than the rated current, the power converter is controlled to reduce the output voltage and improve the output current so as to output constant power.
5. The circuit for maintaining constant power output from multiple power supply modules of claim 4, wherein the output current of said power converter does not exceed the current maximum of the current power supply module at the most.
6. The circuit for maintaining constant power output to multiple power modules of claim 4, wherein the output voltage of said power converter is no lower than the minimum voltage of the current power module.
7. A power supply module comprising a circuit for maintaining constant power output from multiple power supply modules as claimed in any one of claims 4 to 6.
CN202011041913.XA 2020-09-28 2020-09-28 Method and circuit for maintaining constant power output of multiple power supply modules and power supply module Pending CN112260515A (en)

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Application Number Priority Date Filing Date Title
CN202011041913.XA CN112260515A (en) 2020-09-28 2020-09-28 Method and circuit for maintaining constant power output of multiple power supply modules and power supply module

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Application Number Priority Date Filing Date Title
CN202011041913.XA CN112260515A (en) 2020-09-28 2020-09-28 Method and circuit for maintaining constant power output of multiple power supply modules and power supply module

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103731033A (en) * 2013-12-19 2014-04-16 山东艾诺仪器有限公司 Wide-range DC power supply with constant power output characteristic
CN103973114A (en) * 2014-05-06 2014-08-06 中国电子科技集团公司第四十一研究所 Constant power control direct-current power supply
CN111614293A (en) * 2020-06-04 2020-09-01 南京兴航动力科技有限公司 Digital comprehensive control method for voltage of aviation alternating-current generator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103731033A (en) * 2013-12-19 2014-04-16 山东艾诺仪器有限公司 Wide-range DC power supply with constant power output characteristic
CN103973114A (en) * 2014-05-06 2014-08-06 中国电子科技集团公司第四十一研究所 Constant power control direct-current power supply
CN111614293A (en) * 2020-06-04 2020-09-01 南京兴航动力科技有限公司 Digital comprehensive control method for voltage of aviation alternating-current generator

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