CN102622037A - Parallel PFC (Power Factor Correction) rectifying modules and current sharing control method - Google Patents
Parallel PFC (Power Factor Correction) rectifying modules and current sharing control method Download PDFInfo
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- CN102622037A CN102622037A CN2012101030467A CN201210103046A CN102622037A CN 102622037 A CN102622037 A CN 102622037A CN 2012101030467 A CN2012101030467 A CN 2012101030467A CN 201210103046 A CN201210103046 A CN 201210103046A CN 102622037 A CN102622037 A CN 102622037A
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Abstract
The invention discloses a parallel PFC (Power Factor Correction) rectifying module and a control method. The parallel PFC rectifying module comprises at least two parallel PFC rectifying modules, and each PFC rectifying module comprises an output voltage control device and also comprises an averaging module, a current sharing controller and a voltage summing module successively connected, wherein the output voltage control device is respectively connected with the averaging module, the current sharing controller and the voltage summing module, and the averaging module of each PFC rectifying module is connected with the averaging modules and the output voltage control devices of other PFC rectifying modules. Input current commands are rectified as input of PFC current sharing control by using the averaging module, the current sharing controller and the voltage summing module, and PFC current sharing control is realized. Therefore, when the PFC rectifying modules operate in parallel, over-current fault or over-temperature fault can not occur due to uneven current. The advance of the power source current averaging technique is promoted.
Description
Technical field
The present invention relates to power technique fields, be specifically related to a kind of parallel PFC rectification module and current-sharing control method.
Background technology
As shown in Figure 1, the control section 216 of prior art power supply PFC (Power Factor Correction, PFC) rectification module comprises PFC DC bus-bar voltage control section 2161 and PFC input current control section 2162; Realize output voltage control and input current PFC.PFC DC bus-bar voltage control section 2161 has two input (output voltage set-points
u OrefAnd output voltage
u o), obtain output (instruction of rectification input current) through regulating
I Iref, and offering PFC input current control section 2162, this module realizes output voltage voltage stabilizing control.PFC input current control section 2162: three inputs (rectification input current instruction is arranged
I Iref, the input voltage instantaneous value
u iWith the input current instantaneous value
i i), obtaining output (pwm pulse) through regulating, and offer the rectification main circuit of PFC rectification module, this functions of modules realizes the amplitude and the Waveform Control of input current.When the parallel running of PFC rectification module, if still adopt single PFC rectification module controlling schemes, because voltage sample exists the sum of errors start-up course different in the actual engineering; The rectification input current instruction (amplitude) that causes each module output voltage regulating and controlling to obtain; Have very big difference, non-equilibrium state appears in the input current of each PFC rectification module, even the required energy of all PFC rectification modules occurs all only by single PFC rectification module power supply; Input current is excessive; Produce over current fault or excess temperature fault, the operation that logs off of this module is followed input current and is focused on another PFC rectification module again; Produce over current fault or excess temperature fault again and the operation that logs off finally makes whole modular power or ups power cisco unity malfunction.
Summary of the invention
The technical matters that the present invention will solve provides a kind of parallel PFC rectification module and current-sharing control method, the PFC rectification module that overcomes prior art when parallel running, the over current fault that can occur causing or the defective of excess temperature fault because of not current-sharing.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of parallel PFC rectification module; The PFC rectification module that comprises at least two parallel connections; Wherein each said PFC rectification module comprises output voltage-operated device; Each said PFC rectification module also comprises the module of averaging, equalizing controller and the voltage summation module that links to each other successively; Said output voltage-operated device links to each other with the said module of averaging, said equalizing controller and said voltage summation module respectively; Average module and the output voltage-operated device of average module and other PFC rectification module of each said PFC rectification module link to each other; The said module of averaging is used for rectification input current instruction the carrying out superposed average with the output voltage-operated device output of each said PFC rectification module; Obtain average rectification input current instruction and output to said equalizing controller; Said equalizing controller is used for the rectification input current command calculations trim voltage according to the output voltage-operated device output of the PFC rectification module at said average rectification input current instruction and place, and said voltage summation module is used for said trim voltage and output voltage set-point are superposeed, and obtains the output voltage modified value and outputs to said output voltage-operated device.
Described parallel PFC rectification module, the wherein said module of averaging comprise operational amplifier IC3C and the resistance R 30 that links to each other with its input end.
Described parallel PFC rectification module, wherein said equalizing controller comprise operational amplifier IC2B and connect the resistance R 33 of its input end and output terminal, resistance R 34, resistance R 35, resistance R 36 and capacitor C 30.
Described parallel PFC rectification module, wherein said voltage summation module comprise operational amplifier IC2D and connect the resistance R 20 of its input end and output terminal, resistance R 21, resistance R 22 and resistance R 23.
Described parallel PFC rectification module, wherein the module of averaging of each said PFC rectification module links to each other with reference to bus through the rectification input current.
A kind of parallel PFC rectification module current-sharing control method comprises step:
A, superposed average is carried out in the rectification input current instruction of the output voltage-operated device of each PFC rectification module output, obtain average rectification input current instruction;
B, according to the rectification input current command calculations trim voltage of the output voltage-operated device output of said average rectification input current instruction and current PFC rectification module;
C, said trim voltage and output voltage set-point are superposeed, obtain the output voltage modified value and output to output voltage-operated device.
Beneficial effect of the present invention: utilization of the present invention is averaged module, equalizing controller and voltage summation module with the input of rectification input current instruction as the PFC sharing control; Realize the PFC sharing control; Make the PFC rectification module when parallel running; The over current fault or the excess temperature fault that cause because of not current-sharing can not occur, the present invention has advanced the progress of power supply flow equalize technology.
Description of drawings
The present invention includes following accompanying drawing:
Fig. 1 is a prior art PFC rectification module synoptic diagram;
Fig. 2 is a parallel PFC rectification module synoptic diagram of the present invention;
Fig. 3 is a parallel PFC rectification module embodiment circuit diagram of the present invention.
Embodiment
According to accompanying drawing and embodiment the present invention is done further explain below:
As shown in Figures 2 and 3; Parallel PFC rectification module of the present invention comprises the PFC rectification module of at least two parallel connections; Wherein each PFC rectification module comprises output voltage-operated device 2161; Each PFC rectification module also comprises the module of averaging, equalizing controller and the voltage summation module that links to each other successively; Output voltage-operated device 2161 links to each other with the module of averaging, equalizing controller and voltage summation module respectively; Average module and the output voltage-operated device of average module and other PFC rectification module of each PFC rectification module link to each other; The module of averaging is carried out superposed average with the rectification input current instruction of the output voltage-operated device output of each PFC rectification module, obtains average rectification input current instruction and outputs to equalizing controller, and equalizing controller is according to the rectification input current command calculations trim voltage of the output voltage-operated device output of the PFC rectification module at average rectification input current instruction and place; The voltage summation module superposes trim voltage and output voltage set-point, obtains the output voltage modified value and outputs to output voltage-operated device 2161.The module of in specific embodiment of the present invention, averaging comprises operational amplifier IC3C and the resistance R 30 that links to each other with its input end.Equalizing controller comprises operational amplifier IC2B and connects the resistance R 33 of its input end and output terminal, resistance R 34, resistance R 35, resistance R 36 and capacitor C 30.The voltage summation module comprises operational amplifier IC2D and connects the resistance R 20 of its input end and output terminal, resistance R 21, resistance R 22 and resistance R 23.The module of averaging of each PFC rectification module links to each other with reference to bus through the rectification input current.
Current-sharing control method of the present invention comprises step:
A, superposed average is carried out in the rectification input current instruction of the output voltage-operated device of each PFC rectification module output, obtain average rectification input current instruction;
The rectification input current command calculations trim voltage of the output voltage-operated device output of B, the average rectification input current instruction of basis and current PFC rectification module;
C, trim voltage and output voltage set-point are superposeed, obtain the output voltage modified value and output to output voltage-operated device.
Input current sharing control device 2163 of the present invention comprises 3 inputs: this module rectification input current instruction (amplitude)
I Iref, the output voltage set-point
u OrefWith the rectification input current with reference to the bus signal, after overregulating, obtain the output voltage modified value
u Orefc, and offer output voltage-operated device 2161; Input current sharing control device 2163 of the present invention is made up of three modules: the module of averaging, equalizing controller and voltage summation module;
This module rectification input current instruction (amplitude)
I Iref: from the output of output voltage-operated device 2161;
The output voltage set-point
u Oref: be generally fixed value (datum that provides from the outside sometimes);
The module of averaging: be input as
I IrefWith the rectification input current with reference to the bus signal, with the rectification input current with reference to the common mean value of accomplishing the rectification input current instruction (amplitude) of obtaining all modules of system of bus
I Irefav, and offer equalizing controller;
Equalizing controller: be input as
I IrefWith
I Irefav, (VD is with reference to amount trimmed Δ u through regulating output
Oref), and offer the voltage summation module;
Voltage summation module: to input
u OrefWith Δ u
OrefSue for peace, obtain the output voltage modified value
u Orefc, and offer output voltage-operated device 2161.
With module i is the example functions:
IC3C among the module i, R30 and be connected to the R30 of other modules with reference to bus through the rectification input current form the hardware electric current of averaging, the rectification input current instruction of each module
I IrefDeliver to its R30, the output of amplifier IC3C promptly obtains the mean value of the rectification input current instruction (amplitude) of used module
I Irefav
IC2B and accessory circuit thereof obtain module i's
I IrefWith system
I Irefav, regulate the amount trimmed Δ u that obtains the output voltage reference
Oref
IC2D and accessory circuit thereof realize and summation, obtain Δ u
OrefWith
u OrefSum
u Orefc
The concrete adjustment process of module i is following:
When module i's self
I IrefRatio
I IrefavHour, the output of IC2B reduces; I2CB output reduces the then output of IC2D
u OrefcIncrease, and deliver to PFC DC bus-bar voltage control section 2161;
u OrefcIncrease, 2161 make module self with adjusting
I IrefIncrease, this process up to
I IrefWith
I IrefavEquate;
When module i's self
I IrefRatio
I IrefavWhen big, the output of IC2B increases; I2CB exports increase, then the output of IC2D
u OrefcReduce, and deliver to output voltage-operated device 2161;
u OrefcReduce, output voltage-operated device 2161 makes module self with adjusting
I IrefReduce, this process up to
I IrefWith
I IrefavEquate;
To sum up, through the adjusting of sharing control, module i's
I IrefWith system
I IrefavEquate, and then realized all modules of system
I IrefEquate that each module is made the command value of its input current amplitude and module self by output voltage-operated device 2161 controls simultaneously
I IrefUnanimity, thereby finally realized each module input current consistent (promptly having realized the sharing control of input current).
Those skilled in the art do not break away from essence of the present invention and spirit; Can there be the various deformation scheme to realize the present invention; The above is merely the preferable feasible embodiment of the present invention; Be not so limit to interest field of the present invention, the equivalent structure that all utilizations instructions of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (6)
1. parallel PFC rectification module; The PFC rectification module that comprises at least two parallel connections; Wherein each said PFC rectification module comprises output voltage-operated device; It is characterized in that: each said PFC rectification module also comprises the module of averaging, equalizing controller and the voltage summation module that links to each other successively; Said output voltage-operated device links to each other with the said module of averaging, said equalizing controller and said voltage summation module respectively; Average module and the output voltage-operated device of average module and other PFC rectification module of each said PFC rectification module link to each other; The said module of averaging is used for rectification input current instruction the carrying out superposed average with the output voltage-operated device output of each said PFC rectification module; Obtain average rectification input current instruction and output to said equalizing controller; Said equalizing controller is used for the rectification input current command calculations trim voltage according to the output voltage-operated device output of the PFC rectification module at said average rectification input current instruction and place, and said voltage summation module is used for said trim voltage and output voltage set-point are superposeed, and obtains the output voltage modified value and outputs to said output voltage-operated device.
2. parallel PFC rectification module according to claim 1 is characterized in that: the said module of averaging comprises operational amplifier IC3C and the resistance R 30 that links to each other with its input end.
3. parallel PFC rectification module according to claim 2 is characterized in that: said equalizing controller comprises operational amplifier IC2B and connects the resistance R 33 of its input end and output terminal, resistance R 34, resistance R 35, resistance R 36 and capacitor C 30.
4. parallel PFC rectification module according to claim 3 is characterized in that: said voltage summation module comprises operational amplifier IC2D and connects the resistance R 20 of its input end and output terminal, resistance R 21, resistance R 22 and resistance R 23.
5. parallel PFC rectification module according to claim 4 is characterized in that: the module of averaging of each said PFC rectification module links to each other with reference to bus through the rectification input current.
6. a parallel PFC rectification module current-sharing control method is characterized in that, comprises step:
A, superposed average is carried out in the rectification input current instruction of the output voltage-operated device of each PFC rectification module output, obtain average rectification input current instruction;
B, according to the rectification input current command calculations trim voltage of the output voltage-operated device output of said average rectification input current instruction and current PFC rectification module;
C, said trim voltage and output voltage set-point are superposeed, obtain the output voltage modified value and output to output voltage-operated device.
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| CN103023346A (en) * | 2012-11-26 | 2013-04-03 | 中达电通股份有限公司 | Software current-sharing control method of rectifier module |
| CN103455070A (en) * | 2013-09-18 | 2013-12-18 | 武汉中原电子集团有限公司 | Power source voltage-equalizing and current-equalizing device and power source voltage-equalizing and current-equalizing method |
| CN106685245A (en) * | 2015-11-10 | 2017-05-17 | 南车株洲电力机车研究所有限公司 | Multiple control method for rectifier |
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| CN108717278B (en) * | 2018-04-03 | 2020-01-14 | 华南理工大学 | Multi-path parallel real-time digital judgment implementation method for PFC (power factor correction) rectifier module |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102858064A (en) * | 2012-08-29 | 2013-01-02 | 茂硕电源科技股份有限公司 | LED (light emitting diode) centralized drive power parallel system |
| CN102983755A (en) * | 2012-11-26 | 2013-03-20 | 中达电通股份有限公司 | Mixed insertion and current sharing control method for rectifier modules |
| CN103023346A (en) * | 2012-11-26 | 2013-04-03 | 中达电通股份有限公司 | Software current-sharing control method of rectifier module |
| CN103023346B (en) * | 2012-11-26 | 2015-03-25 | 中达电通股份有限公司 | Software current-sharing control method of rectifier module |
| CN103455070A (en) * | 2013-09-18 | 2013-12-18 | 武汉中原电子集团有限公司 | Power source voltage-equalizing and current-equalizing device and power source voltage-equalizing and current-equalizing method |
| CN106685245A (en) * | 2015-11-10 | 2017-05-17 | 南车株洲电力机车研究所有限公司 | Multiple control method for rectifier |
| CN106685245B (en) * | 2015-11-10 | 2019-12-20 | 南车株洲电力机车研究所有限公司 | Rectifier multiplexing control method |
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