CN106208718B - A kind of bidirectional DC/DC system and method based on state transfer - Google Patents
A kind of bidirectional DC/DC system and method based on state transfer Download PDFInfo
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- CN106208718B CN106208718B CN201610769525.0A CN201610769525A CN106208718B CN 106208718 B CN106208718 B CN 106208718B CN 201610769525 A CN201610769525 A CN 201610769525A CN 106208718 B CN106208718 B CN 106208718B
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
Abstract
The invention discloses a kind of bidirectional DC/DC system and methods based on state transfer; including two-way full-bridge converter, DCDC reversible controller, the state shift module for working condition switching and mistake limit and protective module, the DCDC reversible controller output drive signal to two-way full-bridge converter；The state shift module inputs four kinds of signals, respectively the system exception input signal of DCDC reversible controller enable signal, DCDC reversible controller mode altering signal, the inductance zero current indication signal of DCDC reversible controller and limit and protective module excessively；The state shift module output current setting value switching signal and driving disability signal to DCDC reversible controller；The voltage and current signal crossed limit and input two-way full-bridge converter with protective module.The state that the present invention can be realized power direction quickly controllably switches.
Description
Technical field
The present invention relates to bidirectional DC/DC fields, and in particular to a kind of bidirectional DC/DC system and method based on state transfer.
Background technique
In recent years, power electronic technique is paid attention to the rapid development of power semiconductor, is needing to carry out buck
Energy in bidirectional flow occasion, bidirectional DC/DC converter is the only selection in direct current field.
But traditional bidirectional DC/DC is substantially simple and crude ground handle when being broken down or power direction converts
System PWM waveform is closed, and since bidirectional DC/DC is all magnetic element, this rough method can allow magnetic member when dealing with improperly
Part both end voltage rises sharply, and switching tube and magnetic element are damaged when serious.
There is the technology for carrying out multi-mode control for bidirectional DC/DC at present, but requires to close power in handoff procedure
Pipe, fails to solve the above problems.
Paper " high-power bidirectional DC _ DC converter topology structure and its analysis theories research " text proposes state transfer
Buck switching method, but in the idle machine of bidirectional DC/DC, power switch is turned off, and fails to solve the above problems.
A kind of switching based on delay that paper " the digital control research and design of two-way DC_DC converter " text proposes
Method can not accurately be switched in this switching method according to the state of system, also not solve the above problem actually.
Summary of the invention
In order to overcome shortcoming and deficiency of the existing technology, the present invention provides a kind of bidirectional DC/DC based on state transfer
System and method.
The present invention adopts the following technical scheme:
A kind of bidirectional DC/DC system based on state transfer, including two-way full-bridge converter, DCDC reversible controller, be used for
Working condition switching state shift module and cross limit and protective module, the DCDC reversible controller output drive signal to pair
To full-bridge converter；
The state shift module inputs four kinds of signals, the respectively two-way control of DCDC reversible controller enable signal, DCDC
Device mode altering signal, the inductance zero current indication signal of DCDC reversible controller and the system exception of limit and protective module excessively processed
Input signal；The state shift module output current setting value switching signal and driving disability signal to DCDC double-direction control
Device；
The voltage and current signal crossed limit and input two-way full-bridge converter with protective module.
The DCDC reversible controller includes station, PWM analog controller and control ring switch；
The station includes that DCDC reversible controller enables module, mode altering module and inductance zero current instruction mould
Block；
The PWM analog controller includes boosting and buck controller, and lifting is realized under the action of state shift module
Crush-cutting changes；
The control ring switch includes Voltage loop and electric current loop.
The state shift module includes delayed recovery operation module, error condition module, system mode machine and output letter
Number logical operation module, the delayed recovery operation module and error condition module are connect with system mode machine, system mode machine
It is connect with output logical operation.
The two-way full-bridge converter includes the two-way IGBT of big pressure difference starting protection, voltage sensor, current sensor, drop
Press full-bridge IGBT group and boosting full-bridge IGBT group.
A kind of state transition method of bidirectional DC/DC system, system include three kinds of power direction switching, failure and start and stop works
Condition, and including locking, it is offline, standby and operation totally four kinds of working conditions, specific works state transition method it is as follows:
Starting advances into lock state after system boot, if inductance zero current indication signal is high level, enters offline
State；If inductance zero current indication signal is high level and whether abnormal signal is low level, enter standby mode；Otherwise not
Transfering state；
Into after standby mode, if DCDC reversible controller enable signal is high level, and mode altering signal is high electricity
Whether gentle abnormal signal is low level, then enters operating status, otherwise keep standby mode；
Into after operating status, judge whether DCDC reversible controller enable signal is low level, DCDC double-direction control
Whether device mode altering signal is low level and crosses whether the abnormal signal of limit and protective module is high level, if there is a condition
It sets up, then enters off-line state, otherwise remain operational state；
Into after off-line state, state switching module exports current setting value switching signal the given switching of electric current loop
Given to 0, at this moment the Voltage loop of system is removed, the electric current monocycle mode that system work is 0 in given value of current, if inductance at this time
Zero current indication signal is that high level then enters standby mode, otherwise runs delayed recovery and runs module, judges again after 100us
DCDC reversible controller enable signal, DCDC reversible controller mode altering signal and the abnormal signal for crossing limit with protective module,
If DCDC reversible controller enable signal is high level, and mode altering signal is high level and abnormal signal is low level, then
Current setting value switching signal is exported according to current system mode, then rapidly enters operating status.
The abnormal signal includes that over-voltage is abnormal, cross throat floater and operating mode is abnormal.
Beneficial effects of the present invention:
(1) under three kinds of power direction switching, failure and start and stop system conditions, system can be supervised according to state shift module
The information of survey judged, and can under the action of PWM analog controller quick response；
(2), can be given by setting electric current when system has operating condition generation, and system is realized according to systematic state transfer
It exports energy and is greater than input energy, realize effective management of energy；
(3) after the energy of magnetic element storage is complete in systems, when the fault condition of system still cannot be restored
Locking system guarantees the safety of system, is manually booting after system restores normal, safeguards system it is reliable；
(4) all signals for judgement are all logical signals, and vulnerability to jamming is strong, and propagation delay time is small, high reliablity, are easy real
Existing programmable hardware system carries out Multi-thread control, further increases reliability.
(5) realize that power direction is switched fast when realizing without exception.
(6) design of DCDC reversible transducer greatly simplifies and improves the rapidity and reliably of control, reduces and sets
Standby cost, also, under the control of no external status shift module, system is constantly in lock state, has ensured system
Safety.
Detailed description of the invention
Fig. 1 is system construction drawing of the invention；
Fig. 2 is module composition and connection figure of the invention；
Fig. 3 is that of the invention crossing limits and protective module main analog circuit diagram；
Fig. 4 is the composite structural diagram of state shift module of the invention；
Fig. 5 is each module connection figure in state shift module of the invention；
Fig. 6 is the system mode machine schematic diagram in state shift module of the invention；
Fig. 7 is the system control block figure of off-line state of the invention；
Fig. 8 (a) and Fig. 8 (b) is the experimental waveform figure that the present invention carries out the switching of two power directions.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As shown in Fig. 1 and Fig. 2 and Fig. 3, a kind of bidirectional DC/DC system based on state transfer, including the transformation of two-way full-bridge
Device, DCDC reversible controller, state shift module and mistake limit and protective module, the state shift module input four kinds of signals,
It is enable signal, the mode from the system exception input signal for crossing limit and protective module and from DCDC reversible controller respectively
Change signal and inductance zero current indication signal, the state shift module output current setting value switching signal and driving disability
Signal is to DCDC reversible controller.
The voltage and current signal crossed limit and input two-way full-bridge converter with protective module.
The DCDC reversible controller output drive signal is to two-way full-bridge converter.
The state shift module be responsible for system state switching, including from stable state to transient state again to all judgements of stable state
With execution work, control of the state shift module to entire control system is realized, realizes crucial letters all to system
Number judgement, rationally modification control is given and control output, and safeguards system switches in power direction, three kinds of operating conditions of failure and start and stop
Lower system remains to respond fast and reliablely.
The DCDC reversible controller includes station, PWM analog controller and control ring switch, wherein station packet
It includes DCDC reversible controller and enables module, mode altering module and inductance zero current indicating module；
The PWM analog controller includes boosting and buck controller, and lifting is realized under the action of state shift module
Crush-cutting changes；
The control ring switch includes Voltage loop and electric current loop.
Such design method designs reversible transducer unidirectionally, finally realizes state by state shift module
Transfer and power direction switching, it is final to realize bidirectional DC/DC system.Moreover, traditional PWM analog controller is pure hardware
Control, complexity is low, and at low cost, high reliablity, control effect is good, is the base that bidirectional DC/DC system is switched fast power direction
Plinth.
The two-way full-bridge converter includes the two-way IGBT of big pressure difference starting protection, voltage sensor, current sensor, drop
Full-bridge IGBT group and boosting full-bridge IGBT group are pressed, the scope of application of the system is improved.
As shown in Fig. 4 and Fig. 5 and Fig. 6, the state shift module includes delayed recovery operation module, error condition mould
Block, system mode machine and output signal logical operation module.
In order to guarantee reliably to shift, the present invention joined delay recovery operation mould on the basis of original system mode machine
Block, error condition module and output signal logical operation module, the carry out transfering state and protection DCDC of auxiliary system state machine
Reversible transducer.Meanwhile the abnormal input signal of state shift module includes that throat floater and operating mode are different extremely, excessively for over-voltage
Often.
Meanwhile main circuit topology is modified by the way that the two-way IGBT of big pressure difference starting protection is added, realize big pressure difference boosting starting
When crossed in inductive current and realize shutdown in limited time, cut off the energy source of boosting, inductive current waited to be restored to normal current value 30A
The two-way IGBT is connected again below, continues as rear class and energy is provided.If without over-current signal, the always on two-way IGBT.
As shown in fig. 7, the present invention includes three kinds of operating conditions, it is the system failure, power direction switching and shutdown respectively, for reality
The system of these three existing states can state transfer, the state includes locking, standby, operation and off-line state, and four kinds of states
State transfer depend on the instruction of inductance zero current, DCDC reversible controller enable signal, DCDC reversible controller mode altering
Signal and the abnormal signal for crossing limit with protective module.In such design scheme, all signals are all level signal, vulnerability to jamming
By force, propagation delay time is small, is beneficial to realize that multithreading quickly judges using programmable hardware circuit.Above-mentioned four kinds are depended on simultaneously
The monitoring of system signal, comprehensively considered system using break down, power direction switches or three kinds of system start and stop etc.
Operating condition, the perfect in shape and function of system.
Since bidirectional DC/DC system all includes boosting and decompression mode, when power direction variation or failure occurs, if
The pwm signal for blocking side IGBT group at once, being then turned on electric current that the pwm signal of the other side will lead in system cannot be normal
Commutation damages system to demolish IGBT group.
Specific transfer method are as follows:
(1) after system boot starting advance into lock state, if inductance zero current indication signal be high level, enter from
Linear state；If inductance zero current indication signal is high level and whether abnormal signal is low level, enter standby mode；Otherwise
Not transfering state；
(2) after entering standby mode, if DCDC reversible controller enable signal is high level, and mode altering signal is height
Whether level and abnormal signal are low level, then enter operating status, otherwise keep standby mode；
(3) enter after operating status, judge whether DCDC reversible controller enable signal is low level, the two-way control of DCDC
Whether device mode altering signal processed is low level and crosses whether the abnormal signal of limit and protective module is high level, if there is an item
Part is set up, then enters off-line state, otherwise remain operational state；
(4) enter after off-line state, state switching module exports current setting value switching signal the given of electric current loop
It is switched to 0 to give, at this moment the Voltage loop of system is also removed, the electric current monocycle mode that work is 0 in given value of current, if electric at this time
Sense zero current indication signal is that high level then enters standby mode, otherwise runs delayed recovery and runs module, sentences again after 100us
Break DCDC reversible controller enable signal, DCDC reversible controller mode altering signal and the abnormal letter for crossing limit with protective module
Number, if DCDC reversible controller enable signal is high level, and mode altering signal is high level and abnormal signal is low level,
Current setting value switching signal is then exported according to current system mode, then rapidly enters operating status.
The key of bidirectional DC/DC system based on state transfer is off-line mode, and in disconnection mode, system is not
The PWM of locking system is exported, but exports current setting value switching signal shown in black surround thick in figure by state shift module
Given switching switching to the 0 given of electric current loop, operation is protected under off-line mode to realize, on the one hand, due to electric current
Ring is set as 0, and system rapidly drops to 0 electric current according to DCDC control algolithm and exports, and preventing energy, further defeated feeding system draws
The system failure is played, on the other hand vertical cut PWM driving or directly block PWM driving not as the prior art, and be to maintain
PWM driving always works under normal mode, blocks PWM driving again when the inductive current of system drops to 0, is in system
The energy in portion provides reasonable release approach.
As shown in Fig. 8 (a) and Fig. 8 (b), when carrying out limit and protective module power direction without exception switches, system
Into off-line mode, quick control system allows inductive current to rapidly drop to 0, enters standby mode at this moment and is gone up and down
Driving signal switching is pressed, realizes the switching of zero current power direction, while the given switch of switching electric current ring is realized into run mode
The quick start of new power direction.Experiments have shown that this method being switched fast can be 2 control periods under current-mode
It inside allows electric current to drop to 0, and electric current can be allowed to rise to designated value within 2 control periods.Rest on the time delay of standing-by state
Can be customized by internal system, it is set as 100us herein, power direction has been achieved and has quickly controllably switched.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (5)
1. a kind of bidirectional DC/DC system based on state transfer, which is characterized in that including two-way full-bridge converter, the two-way control of DCDC
Device processed, for working condition switching state shift module and cross limit and protective module, the DCDC reversible controller output is driven
Signal is moved to two-way full-bridge converter；
The state shift module inputs four kinds of signals, respectively DCDC reversible controller enable signal, DCDC reversible controller
The system exception of mode altering signal, the inductance zero current indication signal of DCDC reversible controller and limit and protective module excessively inputs
Signal；The state shift module output current setting value switching signal and driving disability signal to DCDC reversible controller；
The voltage and current signal crossed limit and input two-way full-bridge converter with protective module；
The state shift module includes that delayed recovery operation module, error condition module, system mode machine and output signal are patrolled
Volume computing module, the delayed recovery operation module and error condition module are connect with system mode machine, system mode machine with it is defeated
Signal logic computing module connects out.
2. bidirectional DC/DC system according to claim 1, which is characterized in that the DCDC reversible controller includes operation
Platform, PWM analog controller and control ring switch；
The station includes that DCDC reversible controller enables module, mode altering module and inductance zero current indicating module；
The PWM analog controller includes boosting and buck controller, realizes voltage step-up/step-down under the action of state shift module
It changes；
The control ring switch includes Voltage loop and electric current loop.
3. bidirectional DC/DC system according to claim 1, which is characterized in that the two-way full-bridge converter includes big pressure difference
The two-way IGBT of starting protection, voltage sensor, current sensor, decompression full-bridge IGBT group and boosting full-bridge IGBT group.
4. the state transition method of bidirectional DC/DC system according to claim 1-3, which is characterized in that system packet
Three kinds of power direction switching, failure and start and stop operating conditions are included, and including locking, offline, standby and operation totally four kinds of working conditions, tool
Body running state transition method is as follows:
Starting advances into lock state after system boot, if inductance zero current indication signal is high level, enters off-line state；
If inductance zero current indication signal is low level and abnormal signal is low level, enter standby mode；Otherwise not transfering state；
Into after standby mode, if DCDC reversible controller enable signal be high level, and mode altering signal be high level and
When abnormal signal is low level, then enters operating status, otherwise keep standby mode；
Into after operating status, judge whether DCDC reversible controller enable signal is low level, DCDC reversible controller mould
Whether formula change signal is low level and whether cross limit with the abnormal signal of protective module be high level, if having a condition at
It is vertical, then enter off-line state, otherwise remains operational state；
Into after off-line state, state switching module exports current setting value switching signal and the given of electric current loop is switched to 0
Given, at this moment the Voltage loop of system is removed, the electric current monocycle mode that system work is 0 in given value of current, if inductance zero at this time
Current indicating signal is that high level then enters standby mode, otherwise runs delayed recovery and runs module, judges again after 100us
DCDC reversible controller enable signal, DCDC reversible controller mode altering signal and the abnormal signal for crossing limit with protective module,
If DCDC reversible controller enable signal is high level, and mode altering signal is high level and abnormal signal is low level, then
Current setting value switching signal is exported according to current system mode, then rapidly enters operating status.
5. state transition method according to claim 4, which is characterized in that the abnormal signal includes over-voltage exception, mistake
Throat floater and operating mode are abnormal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610769525.0A CN106208718B (en) | 2016-08-30 | 2016-08-30 | A kind of bidirectional DC/DC system and method based on state transfer |
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| CN201610769525.0A CN106208718B (en) | 2016-08-30 | 2016-08-30 | A kind of bidirectional DC/DC system and method based on state transfer |
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| CN106208718B true CN106208718B (en) | 2019-06-18 |
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| CN109962626B (en) * | 2018-12-25 | 2020-12-01 | 西交利物浦大学 | Optimization control method of double-active full-bridge direct-current converter |
| CN115296548B (en) * | 2022-09-28 | 2022-12-13 | 湖南第一师范学院 | Ultrahigh frequency bidirectional DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4401418B2 (en) * | 2008-04-18 | 2010-01-20 | シャープ株式会社 | Bi-directional DC / DC converter and power conditioner |
| CN101741240B (en) * | 2009-12-30 | 2011-11-30 | 广东易事特电源股份有限公司 | Topological structure of two-way DC/DC converter and converter |
| US8698354B2 (en) * | 2010-11-05 | 2014-04-15 | Schneider Electric It Corporation | System and method for bidirectional DC-AC power conversion |
| US9627979B2 (en) * | 2014-10-03 | 2017-04-18 | Bombardier Transportation Gmbh | Dual mode DC-DC converter |
| CN206226286U (en) * | 2016-08-30 | 2017-06-06 | 华南理工大学 | A kind of bidirectional DC/DC system based on state transfer |
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