CN105553231A - Multi-parallel current-sharing method for switching power supplies - Google Patents
Multi-parallel current-sharing method for switching power supplies Download PDFInfo
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- CN105553231A CN105553231A CN201511005602.7A CN201511005602A CN105553231A CN 105553231 A CN105553231 A CN 105553231A CN 201511005602 A CN201511005602 A CN 201511005602A CN 105553231 A CN105553231 A CN 105553231A
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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
- 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
- H02M1/0012—Control circuits using digital or numerical techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a multi-parallel current-sharing method for switching power supplies. A current sensor samples single output currents; the single output currents are converted into 0-20mA current signals through a single current sampling conversion module, and are converged to a current bus through a diode; the current bus converges the single output current signals to a current sampling module of a master machine to form total current return detection; when single machines are appointed into a master machine parallel mode, a constant-voltage/constant-current closed-loop adjustment module forms output total voltage/current closed-loop adjustment; an obtained adjustment signal is digitally processed through an output power adjustment module to obtain a digital adjustment value; the adjustment value is transmitted to various slave machines through a broadcast protocol via an RS485 interface module while master machine power output is adjusted; and the appointed slave machines receive the adjustment value transmitted from the master machine through the RS485 interface module, and then digitally process the adjustment value through the output power adjustment module to form power output adjustment synchronous with the master machine.
Description
Technical field
The invention belongs to switch power technology field, be specifically related to a kind of Switching Power Supply multi-machine parallel connection current equalizing method.
Background technology
Along with the continuous renewal of switch power technology is with fast-developing, and the miniaturization of large power semiconductor device and high frequency, high reliability, high frequency switch power has related to the many industry of multirow, industry is also more and more higher to high power switching power supply demanded power output, the power stage that unit is tens kilowatts cannot meet the demands, needs like this to adopt multiple stage power sources in parallel to use to obtain enough power stages.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems: when multiple stage power sources in parallel uses and works simultaneously, how to ensure that every platform output power of power supply is consistent, namely multi-machine parallel connection current-sharing, it is an extensive Problems existing, industry generally adopts the current-sharing chips such as current-sharing special chip UC3907 and UC3902 to carry out simulation sharing control, what its current equalizing bus bar adopted is voltage transmission signal, voltage amplitude is little, dry anti-crawl agentdefiection ability, is easy to cause parallel operation to export out of control under the electromagnetic environment of complexity; Main frame and slow from electromechanics stream synchronous adjustment speed, each slave CURRENT DISTRIBUTION can be caused uneven, and actual current-sharing effect is undesirable, and long-play can cause service life of a machine to shorten, and overall efficiency is poor; There is limitation in current-sharing power adjustment, when small-power exports, equal properties of flow can degenerate, and even cannot realize current-sharing, namely can not realize realizing current-sharing within the scope of 0 ~ 100% power stage.
Summary of the invention
In order to solve the deficiency of above prior art multi-machine parallel connection current-sharing, the invention provides a kind of Switching Power Supply multi-machine parallel connection current equalizing method, the method adopts unit current output signal to be that 0 ~ 20mA current signal is aggregated into current detecting bus, Digital Detecting is carried out by DSP (or MCU), again in conjunction with RS485 communications control bus, form parallel operation sharing control.Because detection signal is 0 ~ 20mA current signal, and control the upper RS485 Control on Communication adopted, this current equalizing method improves current-equalizing system anti-crawl agentdefiection ability greatly; The introducing of its digital control technology, be realize current-sharing in 0 ~ 100% rated power output gamut to provide powerful guarantee, simultaneously Numeric Control Technology effectively can improve the de-stabilising effect that control system is brought to flow equalizing circuit because of the discreteness of components and parts, power supply can current-sharing work steady in a long-term, effectively raises power supply useful life.
In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions: a kind of Switching Power Supply multi-machine parallel connection current equalizing method, the Switching Power Supply unit control system of described parallel connection comprises power output adjustment module, RS485 interface module, constant voltage/constant current closed-loop adjustment module, current sample module, unit current sample modular converter, diode, current sensor, display unit, described current sensor is sampled to unit output current, 0-20mA current signal is converted to through unit current sample modular converter, current bus is flowed to again through diode, by current bus, each unit output current signal is flowed to the current sample module of main frame, form total current and return detection, when main frame parallel operation pattern is appointed as by unit, by constant voltage/constant current closed-loop adjustment module, formed and export total voltage/current closed-loop adjustment, adjusted signal is after the digital processing of power output adjustment module, obtain digital regulated value, this regulated value, while adjustment main engine power exports, through RS485 interface module, is sent to each from machine by broadcast type agreement, specify each from machine after received the regulated value that main frame sends over by RS485 interface module, this regulated value is led to the digital processing of power output adjustment module, is formed and adjust with the power stage of host synchronization.When the method is set in constant voltage mode of operation, main frame is by sampling to output voltage, and sampled value sends into voltage close loop PID adjuster in constant voltage/constant current closed-loop adjustment module together with setting parallel operation operating voltage, forms conditioning signal.During Switching Power Supply multi-machine parallel connection, main frame can set arbitrarily, and all the other are then from machine, main frame and transmit synchronous adjustment by RS485 broadcast operation between machine.The method can 10 units in parallel realize exporting constant voltage/constant current PID dynamic conditioning under unit output current remain consistent.Described power output adjustment module comprises monitoring processor, and monitoring processor is DSP or MCU.Described power output regulates under the control of monitoring processor, utilizes electric current loop PID adjustment and Voltage loop PID regulated value to realize dynamic equalization.Described Voltage loop PID regulates and electric current loop PID regulates and can carry out unit and parallel operation control mode switch under the control of monitoring processor.
In technique scheme, there is following beneficial effect: 1) during multi-machine parallel connection of the present invention, after any power supply can detect parallel operation, export total voltage total current.2) during multi-machine parallel connection of the present invention, without current equalizing bus bar, only converge into by current signal the RS485 data/address bus that current bus and broadcast type transmit synchronous adjustment value, parallel operation wiring is few, and antijamming capability is strong.3), during multi-machine parallel connection of the present invention, any power supply can be set as main frame, simultaneously in parallel operation arbitrary power supply because of fault exit parallel operation series time, do not affect parallel operation current-sharing effect, thus parallel operation current-equalizing system redundancy of the present invention is good, reliability is high.
Accompanying drawing explanation
Below the content expressed by this Figure of description and the mark in figure are briefly described:
Fig. 1 is the multi-machine parallel connection current-sharing schematic block diagram of the specific embodiment of the present invention.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and operation principle, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.
A kind of multi-machine parallel connection current equalizing method, its unit basic control system in parallel is by A power output adjustment module (DSP or single-chip microcomputer are monitoring processor), BRS485 interface module (host broadcast agreement Drazin inverse value, regulated value is received) from machine, (it carries out unit and parallel operation control mode switch to C (C1/C2) constant voltage/constant current closed-loop adjustment module under monitoring processor controls, both the work of unit constant voltage/constant current can have been realized, also under can being host mode at this unit of appointment, realize exporting total voltage current closed-loop to regulate), D main frame total current sampling (measuring from machine total current) module, E unit current sample also converts 0-20mA current output module to, F diode (being flowed to the current bus sense of current to control), G current sensor (sampling of unit output current), H man-machine interface part is formed.Described G current sensor is sampled to unit output current, convert 0-20mA current output module to convert 0-20mA current signal to through E unit current sample, current bus is flowed to again through F diode, by current bus, each unit output current signal is flowed to D main frame total current sampling (measuring from machine total current) module, forms total current and return detection; When main frame parallel operation pattern is appointed as by unit, by C (C1/C2) constant voltage/constant current closed-loop adjustment module, formed and export total voltage/current closed-loop adjustment, adjusted signal is after the digital processing of A power output adjustment module, obtain digital regulated value, this regulated value, while adjustment main engine power exports, also through BRS485 interface module, is sent to each from machine by broadcast type agreement; Specify each from machine after received the regulated value that main frame sends over by BRS485 interface module, after immediately this regulated value being led to the digital processing of A power output adjustment module, formed and adjust with the power stage of host synchronization, thus realize the object of slave parallel operation current-sharing.
Described method is applicable to multiple stage power sources in parallel constant voltage/constant current and controls, and be equally also applicable to separate unit and control constant voltage/constant current control, the method flexibility is large, applied widely.When multiple stage is in parallel, arbitrarily specify a main frame, all the other are then from machine, and transmit synchronous adjustment value by RS485 broadcast operation between principal and subordinate, as shown in Figure 1, arranging 1# machine is main frame, and all the other are all from machine.
As shown in Figure 1,1# machine is specified to be that multimachine joins operating main frame, 2# machine is that multimachine connection is operating from machine, G current sensor 1 and current sensor 2 carry out 1# machine respectively and 2# machine unit output current is sampled, its sampled value through E unit current sample and convert to 0-20mA current output module convert to 0-20mA electric current letter, this current signal is flowed to current bus through F diode (being flowed to the current bus sense of current to control), unit in parallel connection, by D main frame total current sampling (measuring from machine total current) module, forms total current and returns detection.
When described multi-machine parallel connection is set in constant voltage mode of operation, in main frame and accompanying drawing, 1# machine is by sampling to output voltage, this sampled value sends into C1 voltage close loop PID adjuster in C (C1/C2) constant voltage/constant current closed-loop adjustment module together with setting parallel operation operating voltage, form adjustment signal, this adjustment signal is after A power output adjustment module (DSP or single-chip microcomputer are monitoring processor) process, obtain digital regulated value, this regulated value is while adjustment main engine power exports, also through BRS485 interface module, be sent to each from machine 2# machine by broadcast type agreement, specify each receive by BRS485 interface module the regulated value that main frame sends over from machine 2# machine after, after immediately this regulated value being led to the digital processing of A power output adjustment module, formed and adjust with the power stage of host synchronization, thus while realizing exchange in parallel output Isobarically Control, the object of parallel operation current-sharing when realizing slave parallel operation Isobarically Control.
When described multi-machine parallel connection is set in constant current mode, in main frame and accompanying drawing, 1# machine is by D main frame total current sampling module, obtain parallel operation and export total stream return measurement value, this return measurement value sends into C2 current closed-loop PID adjuster in C (C1/C2) constant voltage/constant current closed-loop adjustment module together with setting parallel operation operating current, form adjustment signal, this adjustment signal is after A power output adjustment module (DSP or single-chip microcomputer are monitoring processor) process, obtain digital regulated value, this regulated value is while adjustment main engine power exports, also through BRS485 interface module, be sent to each from machine 2# machine by broadcast type agreement, specify each receive by BRS485 interface module the regulated value that main frame sends over from machine 2# machine after, after immediately this regulated value being led to the digital processing of A power output adjustment module, formed and adjust with the power stage of host synchronization, thus while realizing exchange output constant current in parallel control, the object of parallel operation current-sharing when realizing slave parallel operation current constant control.
Described a kind of multi-machine parallel connection current share scheme, maximum can under 10 units effectively in parallel realize exporting constant voltage/constant current PID dynamic conditioning, each unit output current remains consistent.
Described power output regulates, and is under the control of DSP (or MCU) processor, utilizes electric current loop PID and Voltage loop PID regulated value to realize dynamic equalization.
Described monitoring processor adopts DSP (or MCU) as controlled processing unit, carries out monitoring, Survey control.
Described Voltage loop PID regulates and electric current loop PID regulates and can carry out unit and parallel operation control mode switch under the control of monitoring processor.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.The protection range that protection scope of the present invention should limit with claims is as the criterion.
Claims (7)
1. a Switching Power Supply multi-machine parallel connection current equalizing method, it is characterized in that, the Switching Power Supply unit control system of described parallel connection comprises power output adjustment module, RS485 interface module, constant voltage/constant current closed-loop adjustment module, current sample module, unit current sample modular converter, diode, current sensor, display unit, described current sensor is sampled to unit output current, 0-20mA current signal is converted to through unit current sample modular converter, current bus is flowed to again through diode, by current bus, each unit output current signal is flowed to the current sample module of main frame, form total current and return detection, when main frame parallel operation pattern is appointed as by unit, by constant voltage/constant current closed-loop adjustment module, formed and export total voltage/current closed-loop adjustment, adjusted signal is after the digital processing of power output adjustment module, obtain digital regulated value, this regulated value, while adjustment main engine power exports, through RS485 interface module, is sent to each from machine by broadcast type agreement, specify each from machine after received the regulated value that main frame sends over by RS485 interface module, this regulated value by the digital processing of power output adjustment module, formed and adjust with the power stage of host synchronization.
2. Switching Power Supply multi-machine parallel connection current equalizing method according to claim 1, it is characterized in that, when the method is set in constant voltage mode of operation, main frame is by sampling to output voltage, sampled value sends into voltage close loop PID adjuster in constant voltage/constant current closed-loop adjustment module together with setting parallel operation operating voltage, forms conditioning signal.
3. Switching Power Supply multi-machine parallel connection current equalizing method according to claim 1, is characterized in that, during Switching Power Supply multi-machine parallel connection, main frame can set arbitrarily, and all the other are then from machine, main frame and transmit synchronous adjustment by RS485 broadcast operation between machine.
4. Switching Power Supply multi-machine parallel connection current equalizing method according to claim 1, is characterized in that, the method can 10 units in parallel realize exporting constant voltage/constant current PID dynamic conditioning under unit output current remain consistent.
5. Switching Power Supply multi-machine parallel connection current equalizing method according to claim 1, is characterized in that, described power output adjustment module comprises monitoring processor, and monitoring processor is DSP or MCU.
6. Switching Power Supply multi-machine parallel connection current equalizing method according to claim 5, is characterized in that, described power output regulates under the control of monitoring processor, utilizes electric current loop PID adjustment and Voltage loop PID regulated value to realize dynamic equalization.
7. Switching Power Supply multi-machine parallel connection current equalizing method according to claim 5, is characterized in that, described Voltage loop PID regulates and electric current loop PID regulates and can carry out unit and parallel operation control mode switch under the control of monitoring processor.
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| CN201511005602.7A CN105553231A (en) | 2015-12-28 | 2015-12-28 | Multi-parallel current-sharing method for switching power supplies |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159934A (en) * | 2016-06-30 | 2016-11-23 | 温州大学 | Based on efficiency and the parallel operation system optimized control method of current-sharing index golden section |
| CN107817393A (en) * | 2016-09-13 | 2018-03-20 | 艾德克斯电子（南京）有限公司 | Electronic load combining system and method |
| CN107959283A (en) * | 2017-11-30 | 2018-04-24 | 宁夏共享模具有限公司 | 3D printing head Driver Card bistable state closed-loop direct electric power system and method |
| CN109085776A (en) * | 2018-07-11 | 2018-12-25 | 常州机电职业技术学院 | A kind of big output constant current source device and the equal method of each branch current value of control |
| CN109194029A (en) * | 2018-10-31 | 2019-01-11 | 北京无线电测量研究所 | A kind of high voltage power supply parallel current-sharing system |
| CN110190593A (en) * | 2019-05-15 | 2019-08-30 | 西安班特利奥能源科技有限公司 | A kind of multimode and machine control method and system |
| CN112165243A (en) * | 2020-10-26 | 2021-01-01 | 合肥同智机电控制技术有限公司 | Automatic current equalizing method for master machine and slave machine of multi-inverter parallel system |
| CN113809907A (en) * | 2021-09-26 | 2021-12-17 | 深圳市斯康达电子有限公司 | Master-slave parallel operation current sharing method based on analog control |
| CN114172357A (en) * | 2021-11-12 | 2022-03-11 | 锐捷网络股份有限公司 | Current sharing method and device, electronic equipment and computer readable storage medium |
| CN114243881A (en) * | 2021-12-23 | 2022-03-25 | 杭州铂科电子有限公司 | Output synchronization regulation method of power supply redundant power system |
| CN115639395A (en) * | 2022-11-18 | 2023-01-24 | 湖南恩智测控技术有限公司 | Electronic load parallel operation current echo algorithm, parallel operation system and electronic equipment |
| CN116404724A (en) * | 2023-05-29 | 2023-07-07 | 深圳市驰普科达科技有限公司 | Outdoor power supply, control method thereof, parallel connection wire and outdoor power supply assembly |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159934B (en) * | 2016-06-30 | 2018-10-30 | 温州大学 | Based on efficiency and flow the parallel operation system optimized control method of index golden section |
| CN106159934A (en) * | 2016-06-30 | 2016-11-23 | 温州大学 | Based on efficiency and the parallel operation system optimized control method of current-sharing index golden section |
| CN111123011A (en) * | 2016-09-13 | 2020-05-08 | 艾德克斯电子（南京）有限公司 | Electronic load device and parallel operation system thereof |
| CN107817393A (en) * | 2016-09-13 | 2018-03-20 | 艾德克斯电子（南京）有限公司 | Electronic load combining system and method |
| CN107817393B (en) * | 2016-09-13 | 2020-05-15 | 艾德克斯电子（南京）有限公司 | Electronic load parallel operation system and method |
| CN107959283A (en) * | 2017-11-30 | 2018-04-24 | 宁夏共享模具有限公司 | 3D printing head Driver Card bistable state closed-loop direct electric power system and method |
| CN109085776A (en) * | 2018-07-11 | 2018-12-25 | 常州机电职业技术学院 | A kind of big output constant current source device and the equal method of each branch current value of control |
| CN109194029A (en) * | 2018-10-31 | 2019-01-11 | 北京无线电测量研究所 | A kind of high voltage power supply parallel current-sharing system |
| CN110190593A (en) * | 2019-05-15 | 2019-08-30 | 西安班特利奥能源科技有限公司 | A kind of multimode and machine control method and system |
| CN112165243A (en) * | 2020-10-26 | 2021-01-01 | 合肥同智机电控制技术有限公司 | Automatic current equalizing method for master machine and slave machine of multi-inverter parallel system |
| CN112165243B (en) * | 2020-10-26 | 2022-11-25 | 合肥同智机电控制技术有限公司 | Automatic current equalizing method for master-slave machine of multi-inverter parallel system |
| CN113809907A (en) * | 2021-09-26 | 2021-12-17 | 深圳市斯康达电子有限公司 | Master-slave parallel operation current sharing method based on analog control |
| CN113809907B (en) * | 2021-09-26 | 2023-05-12 | 深圳市斯康达电子有限公司 | Master-slave parallel operation current sharing method based on analog control |
| CN114172357A (en) * | 2021-11-12 | 2022-03-11 | 锐捷网络股份有限公司 | Current sharing method and device, electronic equipment and computer readable storage medium |
| CN114243881A (en) * | 2021-12-23 | 2022-03-25 | 杭州铂科电子有限公司 | Output synchronization regulation method of power supply redundant power system |
| CN114243881B (en) * | 2021-12-23 | 2023-11-17 | 杭州铂科电子有限公司 | Output synchronous regulation method of power supply redundant power system |
| CN115639395A (en) * | 2022-11-18 | 2023-01-24 | 湖南恩智测控技术有限公司 | Electronic load parallel operation current echo algorithm, parallel operation system and electronic equipment |
| CN116404724A (en) * | 2023-05-29 | 2023-07-07 | 深圳市驰普科达科技有限公司 | Outdoor power supply, control method thereof, parallel connection wire and outdoor power supply assembly |
| CN116404724B (en) * | 2023-05-29 | 2023-08-25 | 深圳市驰普科达科技有限公司 | Outdoor power supply, control method thereof, parallel connection wire and outdoor power supply assembly |
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