CN106685215B - DC-DC converter parallel connection group and its control method - Google Patents
DC-DC converter parallel connection group and its control method Download PDFInfo
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- CN106685215B CN106685215B CN201611026644.3A CN201611026644A CN106685215B CN 106685215 B CN106685215 B CN 106685215B CN 201611026644 A CN201611026644 A CN 201611026644A CN 106685215 B CN106685215 B CN 106685215B
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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
- H02M3/00—Conversion of dc power input into dc power output
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Abstract
The invention discloses a kind of DC-DC converter parallel connection groups, including the transmission of electricity bus to power to the load, transmit electricity on bus by close to load nearby to successively multiple DC converter modules in parallel at a distance, it is that main module works in constant voltage mode from farthest module is loaded, remaining module is to work in constant current mode from module；The invention also discloses a kind of control methods of DC-DC converter parallel connection group；Compared with prior art, each conversion module is in master slave mode in the present invention, is connected between each conversion module without many and diverse analog signal, thus the complexity of simplified control system；As long as the total power capacity of converter parallel connection group is higher than loading, main conversion module can maintain load voltage to reach instantaneous power-balance；Can be switched to when main conversion module failure it is neighbouring from conversion module as main conversion module, power supply will not be interrupted, and provide system stability whereby.
Description
Technical field
The present invention relates to DC-DC converters, more particularly to one kind to be composed of multiple DC-DC converters
In parallel group and its control method.
Background technique
To provide output capacity, multiple DC-DC converters are often together in parallel use by people.With regard to direct current to straight
For stream transformer control method for parallel, the classification having proposed at present controls letter as shown in Figure 1, can substantially divide into needs
The active shunting control methods of number connection be not required to control the two major classes such as the descent method that connect of signal.
Descent method be connect between converter and load a resistance and using output voltage reduce method come control shunt, for
Dynamic shunt then is controlled using voltage circuit gain is reduced.Its advantage is that each converter is that independent operation does not need control letter
Number connection, its right disadvantage is that voltage increases with load and declined, and the reduction of voltage circuit gain also increases its output resistance
It is anti-, keep voltage regulation factor and voltage transient waveform poor.
Active shunt control methods according to position of the flow-dividing control in control loop be divided into again inner looping adjustment framework with outside
Circuit adjusts framework.Inner looping adjustment framework is that all conversion modules possess independent current loop but a shared voltage
Circuit, this voltage circuit generates current order and distributes to each module, as long as the current loop of each module can be such that its electric current follows
This current order, then parallel system can reach the purpose of voltage adjustment and flow-dividing control simultaneously.The advantages of this mode is voltage tune
It is whole precisely, system it is quite stable, but disadvantage be voltage circuit fault when whole system can be made to collapse.It is each that external loop, which adjusts framework,
Module is provided with voltage and current loop, and each module corrects its voltage circuit using the shunt control signal that main module generates
Voltage adjustment signal is shunted with adjusting voltage and control simultaneously.Its stability and the accuracy of voltage adjustment are adjusted compared with inner looping
Framework is slightly worse, but the degree of modularity is higher, reliability is relatively preferable.Compared with descent method, the module of active shunt control methods
Between need control signal connection, therefore the main module or transmission shunt control signal that generate shunt control signal are to each converter
If conducting wire break down, will equally whole system be made to collapse.
Summary of the invention
The present invention is to solve the above problem of the prior art, propose a kind of combined by multiple DC-DC converters and
At in parallel group and its control method.
In order to solve the above technical problems, technical solution proposed by the present invention is to design a kind of DC-DC converter parallel connection
Group comprising the transmission of electricity bus to power to the load, on bus of transmitting electricity by close to load nearby to successively in parallel multiple straight at a distance
Stream transformer module is that main module works in constant voltage mode from farthest module is loaded, remaining module is to work in perseverance from module
Stream mode, each module circuit structure having the same, all includes: demand limiter, to detect transmission of electricity bus on electric current,
And conveying current constant control order is switched to selection；Voltage sensor, to sense the voltage on transmission of electricity bus, the electricity that will be sensed
Pressure is conveyed to voltage controller after being converted into the voltage signal of amplitude appropriate；Voltage controller receives the voltage signal, simultaneously
Conveying Isobarically Control order is switched to selection；Fault detector, detect the same level module working condition, if it is faulty occur if to
Mode selector sends fault-signal；Selection switch, connection mode selector, the selection constant current mode instruction sent according to it are led
The logical output current constant control order, or the constant pressure control according to the selection constant voltage mode instruction conducting output that it is sent
System order；Mode selector, according to the working condition of the same level module and far from the mode selector in load side proximity modules
The operating mode selection instruction sent determines the operating mode of the same level circuit, and mode selector input is defaulted as in main module
Constant voltage mode instruction is selected, mode selector is switched to the selection of the same level sends the instruction of selection constant voltage mode, simultaneously to close to negative
It carries the mode selector in the proximity modules of side and sends selection constant current mode instruction, when the same level module works normally from module
Mode selector sends selection constant current mould to the selection switch of the same level and the mode selector in load side proximity modules
Formula instruction, when as main module and from module, when the same level module failure, mode selector stops the touching switching in converter
It signals that converter is made to stop working and will be far from the operating mode choosing that the mode selector in load side proximity modules is sent
Select the mode selector that instruction is transferred in load side module；Converter, by defeated after progress dc-dc conversion
Goddess of lightning's line powers to the load；Current controller receives current constant control order or Isobarically Control order that selection switch is sent, according to
The switching that suffered order controls in the converter makes converter reach constant current output or constant voltage output.
Current feedback route is connected between the output end of above-mentioned converter and the current controller.
In same DC converter modules, the demand limiter acquires described in the position ratio of electric current on transmission of electricity bus
Converter output end connection transmission of electricity bus is located closer to load side.
The present invention also proposes a kind of control method of DC-DC converter parallel connection group, in the transmission of electricity bus of connection load
The upper multiple DC converter modules of parallel connection are that main module works in constant voltage mode from farthest module is loaded, remaining module be from
Module works in constant current mode, and each module is prepared into identical circuit structure, all includes: to detect transmission of electricity mother with demand limiter
Electric current on line simultaneously switchs conveying current constant control order to selection；The voltage on transmission of electricity bus is sensed with voltage sensor, will be felt
The voltage measured is conveyed to voltage controller after being converted into the voltage signal of amplitude appropriate；The electricity is received with voltage controller
It presses signal and switchs conveying Isobarically Control order to selection；The working condition of the same level module is detected with fault detector, if there is event
Barrier occurs then to send fault-signal to mode selector；Connection mode selector is switched with selection, the selection sent according to it is permanent
The stream mode instruction conducting output current constant control order, or the selection constant voltage mode instruction conducting output sent according to it
The Isobarically Control order；With mode selector according to the working condition of the same level module and far from load side proximity modules
The operating mode selection instruction sent of mode selector determine the operating mode of the same level circuit, the mode selector in main module
Input terminal be defaulted as selection constant voltage mode instruction, mode selector to the selection of the same level switch send selection constant voltage mode instruction,
Selection constant current mode instruction is sent to the mode selector in load side proximity modules simultaneously, in the same level mould from module
Mode selector hair of the mode selector to the selection switch of the same level and in load side proximity modules when block works normally
It sends to be elected and selects constant current mode instruction.When as main module or from module, when the same level module failure, mode selector stops conversion
The trigger signal switched in device makes converter stop working and the mode selector that will be far from load side proximity modules is sent
Operating mode selection instruction be transferred to close to load side module in mode selector；Dc-dc is carried out with converter
It is powered to the load after conversion by bus of transmitting electricity；Receive the current constant control order or constant pressure that selection switch is sent with current controller
Control command, controlling the switching in the converter according to suffered order makes that converter reaches constant current output or constant pressure is defeated
Out.
Above-mentioned control method further includes, by the output current feedback of the output end of the converter to the current control
Device.
Above-mentioned control method further includes, and in same DC converter modules, the demand limiter is on transmission of electricity bus
The position for acquiring electric current is located closer to load side than converter output end connection transmission of electricity bus.
Compared with prior art, each conversion module is in master slave mode in the present invention, is not necessarily between each conversion module numerous
Miscellaneous analog signal connection, thus the complexity of simplified control system；As long as the total power capacity of converter parallel connection group is than negative
Height is carried, main conversion module can maintain load voltage to reach instantaneous power-balance；It can be with when main conversion module failure
Switch to it is neighbouring from conversion module as main conversion module, power supply will not be interrupted, and provide system stability whereby.
Detailed description of the invention
Fig. 1 is existing converter control method for parallel classification chart；
Fig. 2 is that the present invention shunts schematic diagram；
Fig. 3 is present pre-ferred embodiments control principle block diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is described in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, not
For limiting the present invention.
Present invention discloses a kind of DC-DC converter parallel connection groups, referring to Fig. 3 comprising the transmission of electricity to power to the load
Bus, on bus of transmitting electricity by close to load nearby to successively multiple DC converter modules in parallel at a distance, it is farthest from load
Module is that main module works in constant voltage mode, remaining module is to work in constant current mode from module, and each module is having the same
Circuit structure all includes: demand limiter, to detect the electric current on transmission of electricity bus and switch conveying current constant control to selection
Order；The voltage sensed is converted into the voltage of amplitude appropriate to sense the voltage on transmission of electricity bus by voltage sensor
Voltage controller is conveyed to after signal；Voltage controller receives the voltage signal and switchs conveying Isobarically Control life to selection
It enables；Fault detector detects the working condition of the same level module, sends fault-signal to mode selector if faulty occur；
Selection switch, connection mode selector, the selection constant current mode instruction conducting output sent according to it current constant control are ordered
It enables, or the Isobarically Control order according to the selection constant voltage mode instruction conducting output that it is sent；Mode selector, according to
The working condition of the same level module and the operating mode selection instruction sent far from the mode selector in load side proximity modules
(instruction of selection constant current mode or the instruction of selection constant voltage mode) determines the operating mode of the same level circuit, the model selection in main module
Device input terminal is defaulted as selection constant voltage mode instruction, and mode selector, which switchs to send to the selection of the same level, selects constant voltage mode to refer to
Enable, simultaneously to close to load side proximity modules in mode selector send selection constant current mode instruction, from module this
Selection switch of the mode selector to the same level and the model selection in load side proximity modules when grade module works normally
Device sends selection constant current mode instruction.When as main module or from module, when the same level module failure, mode selector stops
The trigger signal switched in converter makes converter stop working and will be far from the mode selector in load side proximity modules
The operating mode selection instruction sent is transferred to the mode selector in load side module；Converter carries out direct current extremely
It is powered to the load after direct current conversion by bus of transmitting electricity；Current controller, receive the selection current constant control order sent of switch or
Isobarically Control order, controlling the switching in the converter according to suffered order makes converter reach constant current output or constant pressure
Output.It may be noted that: converter, which carries out dc-dc conversion, to be realized by carrying out pwm control to its internal switch,
The trigger signal of mode selector shutdown switch can make converter stop working, and by malfunctioning module, escape goes out from power supply system
Come, the stabilization of maintenance system；And current controller switchs converter inside and carries out pwm control then achievable constant current output or perseverance
Pressure output.
Each conversion module circuit is identical, and the external loop in module is that voltage controller circuit and demand limiter return
Road, inner looping are current controller.External loop is responsible for generating the control command of inner looping, and what voltage controller generated is constant pressure control
System order, what demand limiter generated is current constant control order, and two control commands are all connected on selection switch.Selection switch is selected
One conducting, the current controller of control inner looping is removed with Isobarically Control order or current constant control order, to make entire converter
Module is in constant voltage mode or constant flow module, selects the switching of switch by controlling far from load one adjacent block, leaves negative
Carrying last farthest module is main module, and operating mode is redefined for constant voltage mode.Other modules are from module, work
In constant current mode.When main module failure, fault detector detects faulty generation, sends failure letter to mode selector
Number, converter is enabled to stop working for mode selector and escape comes out from power supply system, while the selection of itself input terminal is permanent
Die pressing type instruction is transferred to the mode selector in load side module, so that the module is changed to constant voltage mode, to make
Entire power supply system has a module to work in constant voltage mode, whereby the reliability of lifting system.
In the preferred embodiment, current feedback line is connected between the output end of the converter and the current controller
Road marks in i.e. Fig. 3i o1 、i o2 Withi oN Route, the current feedback route be interior feedback circuit, to each converter of feedback
The output circuit of itself plays the role of stablizing output electric current.
In same DC converter modules, the demand limiter acquires described in the position ratio of electric current on transmission of electricity bus
Converter output end connection transmission of electricity bus is located closer to load side.Under this structure, between conversion module and with it is negative
The connection type of load be concatenation connection, Group I (1 < I < N) converter regard its close to before load end I-1 group converter as it
The some of load.Main module (converter N) is the module farthest away from load and operates in constant pressure (CV) mode, remaining is from mould
Block (converter 1:N-1) operates in constant current (CC) mode.It is to be sensed load electricity from the control mode of module constant current
Streami Li (i=1,2 ...) obtain the control command of converter via a demand limiteri oi *(i=1,2 ...), control life
It enablesi oi *Again with the converter current of sensingi oi To control the switching of converter after current controller adjusts, so that electric
Streami oi It finally can closely follow its orderi oi *.Main module feedback output voltage is simultaneously adjusted via voltage controller to generate interior return
Road electric current control command (i oN *), control commandi oN *Again with the converter current of sensingi oN After current controller adjusts to
The switching for controlling converter, so that electric currenti oN It finally can closely follow its orderi oN *。
By the connection of above-mentioned concatenation and load current sensing mode and the design of principal and subordinate's module controller, multiple groups turn
As shown in Fig. 2, it is by taking 4 groups of converters as an example, result can be pushed into the converter parallel connection of N group for the shunting of parallel operation parallel connection, be described as follows:
Closest to load 3 groups from conversion module only current loop act, only the 4th group of main module converter be provided simultaneously with voltage and
Current loop.That is, in control be the 1st to the 3rd group of converters operation in so-called CC (current constant control) mode, and the 4th group turns
Exchanger operation in CV (Isobarically Control) mode, as long as therefore the output of the 4th group of (main module) converter be less than its capacity, just
It can maintain the voltage of transmission of electricity bus (i.e. supply load).The current limliting thresholding of each converter inside according to its output capacity, therefore even if
Also this system can be maintained normally to work when each converter capacity situation is inconsistent.Since each conversion module is female by transmission of electricity
Line is successively connected with load, and the converter close to load is made preferentially to provide electric power, in relatively gently load and always available electricity in parallel
Power capacity relatively load it is high in the case where, any electric power may not then be provided from farther away module is loaded, to make each mould
The power supply and load electricity consumption of block are able to equilibrium,transient.The above control method can achieve be not required to analog control signal connection can also
Multiple groups conversion module is in parallel.By above concept it is found that the shunting proposed can make the I group converter in N group converter
The I-1 group output amplitude for participating in (0 ￡ I ￡ N herein) in parallel, and being wherein closer to load is equal to the electric current of IOM (cut-off current), the
I group then exports the remaining part less than IOM, and voltage is then maintained by the main module of last N group.Load current is if on-fixed
Converter number in parallel also on-fixed is participated in, so the distribution of method electric current is not average.Although each module has voltage
Circuit, but the voltage circuit of only main module acts (control command is as produced by its voltage controller), and remaining module only has electricity
It flows circuit behavior (control command is as produced by its demand limiter), from module failure period meeting escape, but works as main module failure
When will switch previous (nearly load-side) it is neighbouring from module become main module, generate its current order by its voltage controller,
So can ensure that under main module failure, system also can continued power, have fault-tolerant ability.
The present invention also proposes a kind of control method of DC-DC converter parallel connection group, in the transmission of electricity bus of connection load
The upper multiple DC converter modules of parallel connection are that main module works in constant voltage mode from farthest module is loaded, remaining module be from
Module works in constant current mode, and each module is prepared into identical circuit structure, all includes: to detect transmission of electricity mother with demand limiter
Electric current on line simultaneously switchs conveying current constant control order to selection；The voltage on transmission of electricity bus is sensed with voltage sensor, will be felt
The voltage measured is conveyed to voltage controller after being converted into the voltage signal of amplitude appropriate；The electricity is received with voltage controller
It presses signal and switchs conveying Isobarically Control order to selection；The working condition of the same level module is detected with fault detector, if there is event
Barrier occurs then to send fault-signal to mode selector；Connection mode selector is switched with selection, the selection sent according to it is permanent
The stream mode instruction conducting output current constant control order, or the selection constant voltage mode instruction conducting output sent according to it
The Isobarically Control order；With mode selector according to the working condition of the same level module and far from load side proximity modules
Mode selector send operating mode selection instruction (selection constant current mode instruction or selection constant voltage mode instruction) determine this
The operating mode of grade circuit, mode selector input is defaulted as selection constant voltage mode instruction, mode selector in main module
The instruction of selection constant voltage mode is sent to the selection switch of the same level, simultaneously to the mode selector in load side proximity modules
Send selection constant current mode instruction, from module the same level module work normally when mode selector to the selection of the same level switch and
Mode selector in load side proximity modules sends selection constant current mode instruction.As main module or from module
When, when the same level module failure mode selector stop the trigger signal that switchs in converter make converter stop working and incite somebody to action
It is transferred to far from the operating mode selection instruction that the mode selector in load side proximity modules is sent close to one side form of load
Mode selector in block；It is powered to the load after carrying out dc-dc conversion with converter by bus of transmitting electricity；Electricity consumption flow control
Device processed receives the current constant control order or Isobarically Control order that selection switch is sent, and is controlled in the converter according to suffered order
Switching so that converter is reached constant current output or constant voltage output.
Each conversion module working principle is identical, and the external loop in module is voltage controller circuit and demand limiter
Circuit, inner looping are current controller.External loop is responsible for generating the control command of inner looping, and what voltage controller generated is constant pressure
Control command, what demand limiter generated is current constant control order, and two control commands are all connected on selection switch.Selection switch
A conducting is selected, the current controller of control inner looping is removed with Isobarically Control order or current constant control order, to make entirely to convert
Device module is in constant voltage mode or constant flow module, selects the switching of switch by controlling far from load one adjacent block, leaves
Last farthest module of load is main module, and operating mode is redefined for constant voltage mode.
In the preferred embodiment, above-mentioned control method further includes, by the output current feedback of the output end of the converter
To the current controller.
It is marked in feedback route, that is, Fig. 3i o1 、i o2 Withi oN Route, the current feedback route be interior feedback circuit, to return
The output circuit for presenting each converter itself plays the role of stablizing output electric current.
Above-mentioned control method further includes, and in same DC converter modules, the demand limiter is on transmission of electricity bus
The position for acquiring electric current is located closer to load side than converter output end connection transmission of electricity bus.Under this structure,
It is to concatenate connection between conversion module and with the connection type of load, Group I (1 < I < N) converter regards it close to load end
The some that I-1 group converter loads for it before.Main module (converter N) is the module farthest away from load and operates in constant pressure
(CV) mode, remaining is to operate in constant current (CC) mode from module (converter 1:N-1).From the control of module constant current
Mode is to be sensed load currenti Li (i=1,2 ...) obtain the control command of converter via a demand limiteri oi *
(i=1,2 ...), control commandi oi *Again with the converter current of sensingi oi To control conversion after current controller adjusts
The switching of device, so that electric currenti oi It finally can closely follow its orderi oi *.Main module feedback output voltage and via voltage control
Device processed adjustment with generate inner looping electric current control command (i oN *), control commandi oN *Again with the converter current of sensingi oN Through electricity
To control the switching of converter after stream controller adjustment, so that electric currenti oN It finally can closely follow its orderi oN *。
By the connection of above-mentioned concatenation and load current sensing mode and the design of principal and subordinate's module controller, multiple groups turn
As shown in Fig. 2, it is by taking 4 groups of converters as an example, result can be pushed into the converter parallel connection of N group for the shunting of parallel operation parallel connection, be described as follows:
Closest to load 3 groups from conversion module only current loop act, only the 4th group of main module converter be provided simultaneously with voltage and
Current loop.That is, in control be the 1st to the 3rd group of converters operation in so-called CC (current constant control) mode, and the 4th group turns
Exchanger operation in CV (Isobarically Control) mode, as long as therefore the output of the 4th group of (main module) converter be less than its capacity, just
It can maintain the voltage of transmission of electricity bus (i.e. supply load).The current limliting thresholding of each converter inside according to its output capacity, therefore even if
Also this system can be maintained normally to work when each converter capacity situation is inconsistent.Since each conversion module is female by transmission of electricity
Line is successively connected with load, and the converter close to load is made preferentially to provide electric power, in relatively gently load and always available electricity in parallel
Power capacity relatively load it is high in the case where, any electric power may not then be provided from farther away module is loaded, to make each mould
The power supply and load electricity consumption of block are able to equilibrium,transient.The above control method can achieve be not required to control signal connection also can be with multiple groups
Conversion module is in parallel.By above concept it is found that the shunting proposed can be such that the I group converter in N group converter participates in
(0 ￡ I ￡ N herein) in parallel, and the I-1 group output amplitude for being wherein closer to load is equal to the electric current of IOM (cut-off current), Group I
The remaining part less than IOM is then exported, voltage is then maintained by the main module of last N group.Load current is joined if on-fixed
With converter number in parallel also on-fixed, so the distribution of method electric current is not average.Although each module has voltage to return
Road, but the voltage circuit of only main module acts (control command is as produced by its voltage controller), and remaining module only has electric current
Circuit behavior (control command is as produced by its demand limiter), from module failure period meeting escape, but when main module failure
To switch previous (nearly load-side) it is neighbouring from module become main module, generate its current order by its voltage controller, such as
This can ensure that under main module failure, system also can continued power, have fault-tolerant ability.
Above embodiments are by way of example only, non-to provide constraints.It is any without departing from the application spirit and scope, and to it
The equivalent modifications or change of progress, shall be included in the scope of claims of this application.
Claims (6)
1. a kind of DC-DC converter parallel connection group, including the transmission of electricity bus to power to the load, it is characterised in that: transmission of electricity bus
On by close to load nearby to successively multiple DC converter modules in parallel at a distance, be main module work from farthest module is loaded
Make in constant voltage mode, remaining module is to work in constant current mode from module, and each module circuit structure having the same all wraps
It includes:
Demand limiter switchs conveying current constant control order to detect the electric current on transmission of electricity bus, and to selection；
The voltage sensed is converted into the voltage of amplitude appropriate to sense the voltage on transmission of electricity bus by voltage sensor
Voltage controller is conveyed to after signal；
Voltage controller receives the voltage signal, and switchs conveying Isobarically Control order to selection；
Fault detector detects the working condition of the same level module, sends fault-signal to mode selector if faulty occur；
The output constant current control is connected in selection switch, connection mode selector, the selection constant current mode instruction sent according to it
System order, or the Isobarically Control order according to the selection constant voltage mode instruction conducting output that it is sent；
Mode selector is sent according to the working condition of the same level module and far from the mode selector in load side proximity modules
Operating mode selection instruction determine the operating mode of the same level circuit, mode selector input is defaulted as selecting in main module
Constant voltage mode instruction, mode selector is switched to the selection of the same level sends selection constant voltage mode instruction, while to close to load one
Mode selector in the proximity modules of side sends selection constant current mode instruction, the mode when the same level module works normally from module
Selector sends selection constant current mode to the selection switch of the same level and the mode selector in load side proximity modules and refers to
It enables, when as main module or from module, when the same level module failure, mode selector stops the triggering switching in converter letter
Number converter is made to stop working, and by the operating mode selection instruction that mode selector input receives be transferred to it is adjacent and
Mode selector in load side module；
Converter is powered to the load after carrying out dc-dc conversion by bus of transmitting electricity；
Current controller receives current constant control order or Isobarically Control order that selection switch is sent, is controlled according to suffered order
Switching in the converter makes converter reach constant current output or constant voltage output.
2. DC-DC converter parallel connection group as described in claim 1, it is characterised in that: the output end of the converter with
Current feedback route is connected between the current controller.
3. DC-DC converter parallel connection group as claimed in claim 2, it is characterised in that: in same DC converter modules
In, the position that the demand limiter acquires electric current on transmission of electricity bus connects the position of transmission of electricity bus than the converter output end
It sets closer to load side.
4. a kind of control method of DC-DC converter parallel connection group, it is characterised in that: on the transmission of electricity bus of connection load
Multiple DC converter modules in parallel are that main module works in constant voltage mode from farthest module is loaded, remaining module is from mould
Block works in constant current mode, and each module is prepared into identical circuit structure, all includes:
The electric current on transmission of electricity bus is detected with demand limiter, and switchs conveying current constant control order to selection；
The voltage on transmission of electricity bus is sensed with voltage sensor, the voltage sensed is converted into the voltage signal of amplitude appropriate
After be conveyed to voltage controller；
The voltage signal is received with voltage controller, and switchs conveying Isobarically Control order to selection；
The working condition that the same level module is detected with fault detector sends failure letter to mode selector if faulty occur
Number；
Connection mode selector is switched with selection, the output constant current control is connected in the selection constant current mode instruction sent according to it
System order, or the Isobarically Control order according to the selection constant voltage mode instruction conducting output that it is sent；
It is sent out with mode selector according to the working condition of the same level module and far from the mode selector in load side proximity modules
The operating mode selection instruction come determines the operating mode of the same level circuit, and mode selector input is defaulted as selecting in main module
Constant voltage mode instruction is selected, mode selector is switched to the selection of the same level sends selection constant voltage mode instruction, while to close to load
Mode selector in the proximity modules of side sends selection constant current mode instruction, the mould when the same level module works normally from module
Formula selector sends selection constant current mode to the selection switch of the same level and the mode selector in load side proximity modules
Instruction, when as main module or from module, when the same level module failure, mode selector stops the triggering switching in converter
Signal makes converter stop working, and by the operating mode selection instruction that mode selector input receives be transferred to it is adjacent,
And the mode selector in load side module；
It is powered to the load after carrying out dc-dc conversion with converter by bus of transmitting electricity；
Receive the current constant control order or Isobarically Control order that selection switch is sent with current controller, is controlled according to suffered order
Switching in the converter makes converter reach constant current output or constant voltage output.
5. the control method of DC-DC converter parallel connection group as claimed in claim 4, it is characterised in that: by the conversion
The output current feedback of the output end of device is to the current controller.
6. the control method of DC-DC converter parallel connection group as claimed in claim 5, it is characterised in that: in same direct current
In conversion module, the position that the demand limiter acquires electric current on transmission of electricity bus connects defeated than the converter output end
Goddess of lightning's line is located closer to load side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026644.3A CN106685215B (en) | 2016-11-17 | 2016-11-17 | DC-DC converter parallel connection group and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026644.3A CN106685215B (en) | 2016-11-17 | 2016-11-17 | DC-DC converter parallel connection group and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106685215A CN106685215A (en) | 2017-05-17 |
| CN106685215B true CN106685215B (en) | 2019-01-11 |
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