CN206226286U - A kind of bidirectional DC/DC system based on state transfer - Google Patents
A kind of bidirectional DC/DC system based on state transfer Download PDFInfo
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- CN206226286U CN206226286U CN201620994980.6U CN201620994980U CN206226286U CN 206226286 U CN206226286 U CN 206226286U CN 201620994980 U CN201620994980 U CN 201620994980U CN 206226286 U CN206226286 U CN 206226286U
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Abstract
The utility model discloses a kind of bidirectional DC/DC system based on state transfer; including two-way full-bridge converter, DCDC reversible controllers, the state shift module for working condition switching and mistake limit and protection module, the DCDC reversible controllers output drive signal to two-way full-bridge converter；The state shift module is input into four kinds of signals, and respectively DCDC reversible controllers enable signal, DCDC reversible controller mode alterings signal, the inductance zero current indication signal of DCDC reversible controllers and cross the system exception input signal of limit and protection module；The state shift module output current setting value switching signal and driving disability signal to DCDC reversible controllers；It is described to cross voltage and current signal that limit is input into two-way full-bridge converter with protection module.The utility model can realize the quick controllable switching of the state of power direction.
Description
Technical field
The utility model is related to bidirectional DC/DC field, and in particular to a kind of bidirectional DC/DC system based on state transfer.
Background technology
In recent years, Power Electronic Technique is paid attention to developing rapidly for 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 is converted
System PWM waveform is closed, and because bidirectional DC/DC is all magnetic element, this rough method can allow magnetic unit when dealing with improperly
Part both end voltage is risen sharply, and switching tube and magnetic element are damaged when serious.
The technology that multi-mode control is carried out for bidirectional DC/DC is had at present, but is required for closing power in handoff procedure
Pipe, fails to solve the above problems.
Paper " high-power bidirectional DC _ DC converter topologies structure and its analysis theories research " text proposes state transfer
Buck changing 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 time delay that paper " the digital control research of two-way DC_DC converters and design " text is proposed
Method, in this changing method, it is impossible to which the state according to system is accurately switched, above mentioned problem is not solved actually yet.
Utility model content
For the shortcoming and deficiency that overcome prior art to exist, the utility model provides a kind of based on the two-way of state transfer
DCDC systems.
The utility model is adopted the following technical scheme that：
A kind of bidirectional DC/DC system based on state transfer, including two-way full-bridge converter, DCDC reversible controllers, be used for
Working condition switching state shift module and cross limit and protection module, the DCDC reversible controllers output drive signal to pair
To full-bridge converter；
The state shift module is input into four kinds of signals, and respectively DCDC reversible controllers enable signal, the two-way controls of DCDC
The system exception of device mode altering signal processed, the inductance zero current indication signal of DCDC reversible controllers and mistake limit and protection module
Input signal；The state shift module output current setting value switching signal and driving disability signal to DCDC double-direction controls
Device；
It is described to cross voltage and current signal that limit is input into two-way full-bridge converter with protection module.
The DCDC reversible controllers include operating desk, PWM analog controllers and control ring switch；
The operating desk includes that DCDC reversible controllers enable module, mode altering module and inductance zero current and indicate mould
Block；
The PWM analog controllers include boosting and buck controller, and lifting is realized in the presence of state shift module
Crush-cutting is changed；
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 connected with system mode machine, system mode machine
It is connected with output logical operation.
The two-way full-bridge converter includes the big two-way IGBT of pressure difference starting protection, voltage sensor, current sensor, drop
Pressure full-bridge IGBT groups and boosting full-bridge IGBT groups.
A kind of state transition method of bidirectional DC/DC system, system includes power direction switching, three kinds of works of failure and start and stop
Condition, and including locking, offline, standby and operation totally four kinds of working conditions, specific works state transition method is as follows：
Start after system boot and advance into lock-out state, if inductance zero current indication signal is high level, into offline
State；If inductance zero current indication signal is for high level and whether abnormal signal is low level, into holding state；Otherwise not
Transfering state；
Into after holding state, if it is high level that DCDC reversible controllers enable signal, and mode altering signal is electricity high
Whether gentle abnormal signal is low level, then into running status, otherwise keep holding state；
Into after running status, judge that DCDC reversible controllers enable whether signal is low level, DCDC double-direction controls
Whether device mode altering signal is low level and crosses whether limit and the abnormal signal of protection module are high level, if there is a condition
Set up, then into off-line state, otherwise remain on state；
Into after off-line state, given switching of the state handover module output current setting value switching signal electric current loop
Given to 0, at this moment the Voltage loop of system is removed, and system is operated in the monocyclic pattern of electric current that given value of current is 0, if now inductance
Zero current indication signal is that high level then enters holding state, otherwise runs delayed recovery operation module, is judged again after 100us
DCDC reversible controllers enable signal, DCDC reversible controller mode altering signals and cross the abnormal signal of limit and protection module,
If it is high level that DCDC reversible controllers enable signal, and mode altering signal is that high level and abnormal signal are low level, then
According to current system mode output current setting value switching signal, then rapidly enter running status.
The abnormal signal includes that overvoltage is abnormal, cross throat floater and mode of operation exception.
The beneficial effects of the utility model：
(1) under power direction switching, three kinds of system conditions of failure and start and stop, system can be supervised according to state shift module
The information of survey judged, and can in the presence of PWM analog controllers quick response；
(2) when system has operating mode to occur, can be given by setting electric current, and system is realized according to systematic state transfer
Output energy is more than input energy, realizes 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, it is ensured that the safety of system, is manually booting, the reliability of safeguards system after system is recovered normally；
(4) all signals for judging all are logical signals, and vulnerability to jamming is strong, and propagation delay time is small, and reliability is high, easily real
Existing programmable hardware system carries out Multi-thread control, further improves reliability.
(5) realize that power direction is switched fast when realizing without exception.
(6) design of DCDC reversible transducers is greatly simplified and improves the rapidity and reliably of control, is reduced and is set
Standby cost, also, under the control without external status shift module, system is constantly in lock-out state, has ensured system
Safety.
Brief description of the drawings
Fig. 1 is system construction drawing of the present utility model；
Fig. 2 is module composition of the present utility model and connection figure；
Fig. 3 is that of the present utility model mistake limits and protection module main analog circuit diagram；
Fig. 4 is the composition structure chart of state shift module of the present utility model；
Fig. 5 is each module connection figure in state shift module of the present utility model；
Fig. 6 is the system mode machine sketch in state shift module of the present utility model；
Fig. 7 is the system control block figure of off-line state of the present utility model；
Fig. 8 (a) and Fig. 8 (b) are that the utility model carries out two experimental waveform figures of power direction switching.
Specific embodiment
With reference to embodiment and accompanying drawing, the utility model is described in further detail, but reality of the present utility model
Apply mode not 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 conversion of two-way full-bridge
Device, DCDC reversible controllers, state shift module and mistake limit and protection module, the state shift module are input into four kinds of signals,
It is respectively enable signal, the pattern from the system exception input signal for crossing limit and protection module and from DCDC reversible controllers
Change signal and inductance zero current indication signal, the state shift module output current setting value switching signal and driving disable
Signal is to DCDC reversible controllers.
It is described to cross voltage and current signal that limit is input into two-way full-bridge converter with protection module.
The DCDC reversible controllers output drive signal is to two-way full-bridge converter.
The state shift module is responsible for the state switching of system, including again to all judgements of stable state from stable state to transient state
With execution work, control of the state shift module to whole control system is realized, realize crucial letters all to system
Number judgement, rationally modification control is given and controlled output, and safeguards system switches in power direction, three kinds of operating modes of failure and start and stop
Lower system remains to respond fast and reliablely.
The DCDC reversible controllers include operating desk, PWM analog controllers and control ring switch, wherein operating desk bag
Include DCDC reversible controllers and enable module, mode altering module and inductance zero current indicating module；
The PWM analog controllers include boosting and buck controller, and lifting is realized in the presence of state shift module
Crush-cutting is changed；
The control ring switch includes Voltage loop and electric current loop.
Such design allows that reversible transducer is unidirectionally designed, and finally realizes state by state shift module
Transfer and power direction switching, finally realize bidirectional DC/DC system.And, traditional PWM analog controllers are pure hardware
Control, complexity is low, and low cost, reliability is high, and 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 big two-way IGBT of pressure difference starting protection, voltage sensor, current sensor, drop
Pressure full-bridge IGBT groups and boosting full-bridge IGBT groups, improve the scope of application of the system.
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 ensure reliable transfer, the utility model adds delay recovery fortune on the basis of original system mode machine
Row module, error condition module and output signal logical operation module, accessory system state machine carry out transfering state and protection
DCDC reversible transducers.Meanwhile, the abnormal input signal of state shift module includes that overvoltage is abnormal, cross throat floater and mode of operation
It is abnormal.
Meanwhile, main circuit topology is changed by adding the two-way IGBT of big pressure difference starting protection, realize that big pressure difference boosting starts
When inductive current cross in limited time realize shut-off, cut off boosting energy source, wait inductive current return 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 utility model includes three kinds of operating modes, it is respectively the system failure, power direction switching and shutdown, be
Realize these three states system can state transfer, the state includes locking, standby, operation and off-line state, and four kinds
The state transfer of state depends on inductance zero current to indicate, DCDC reversible controllers enable signal, DCDC reversible controller patterns
Change signal and cross the abnormal signal of limit and protection module.In such design, all of signal is all level signal, is resisted
Immunity is strong, and propagation delay time is small, is beneficial to realize multithreading using programmable hardware circuit quickly to judge.Depend on simultaneously above-mentioned
Four kinds of monitorings of system signal, considered system using breaking down, power direction switches or system start and stop etc.
Three kinds of operating modes, the perfect in shape and function of system.
Because bidirectional DC/DC system all includes boosting and decompression mode, when there is power direction change or failure, if
The pwm signal of side IGBT groups is blocked at once, and being then turned on the pwm signal of opposite side can cause the electric current in system cannot be normal
Commutation, so as to demolish IGBT groups, damages system.
Specifically transfer method is：
(1) after system boot start advance into lock-out state, if inductance zero current indication signal be high level, into from
Wire state；If inductance zero current indication signal is for high level and whether abnormal signal is low level, into holding state；Otherwise
Not transfering state；
(2) after entering holding state, if it is high level that DCDC reversible controllers enable signal, and mode altering signal is height
Whether level and abnormal signal are low level, then into running status, otherwise keep holding state；
(3) enter after running status, judge that DCDC reversible controllers enable whether signal is low level, the two-way controls of DCDC
Whether device mode altering signal processed is low level and crosses whether limit and the abnormal signal of protection module are high level, if there is a bar
Part is set up, then into off-line state, otherwise remain on state；
(4) enter after off-line state, state handover module output current setting value switching signal is the given of electric current loop
It is switched to 0 to give, at this moment the Voltage loop of system is also removed, and is operated in the monocyclic pattern of electric current that given value of current is 0, if now electricity
Sense zero current indication signal is that high level then enters holding state, otherwise runs delayed recovery operation module, is sentenced again after 100us
Disconnected DCDC reversible controllers enable signal, DCDC reversible controller mode altering signals and cross the abnormal letter of limit and protection module
Number, if it is high level that DCDC reversible controllers enable signal, and mode altering signal is that high level and abnormal signal are low level,
Then according to current system mode output current setting value switching signal, then rapidly enter running status.
Bidirectional DC/DC system based on state transfer it is critical only that off-line mode, and in disconnection mode, system does not have
The PWM outputs of locking system, but by state shift module output current setting value switching signal in figure shown in thick black surround
Given switching switch be switched to the 0 of electric current loop and give, so as to realize that operation is protected under off-line mode, on the one hand, due to electric current
Ring is set as 0, and system rapidly drops to the output of 0 electric current according to DCDC control algolithms, and further defeated feeding system draws to prevent energy
The system failure is played, on the other hand vertical cut PWM drives or directly block PWM drives not as prior art, and is to maintain
PWM drives and always works under normal mode, blocks PWM drivings again when the inductive current of system drops to 0, is in system
The energy in portion provides rational release approach.
As shown in Fig. 8 (a) and Fig. 8 (b), when limit was carried out and protection module power direction without exception switches, system
Into off-line mode, quick control system allows inductive current to rapidly drop to 0, into standby mode and is lifted at this moment
Pressure drive signal switching, realizes that zero current power direction switches, while the given switch of switching electric current ring, into run mode, realizes
The quick startup of new power direction.Experiment proves that this method being switched fast can be in 2 controlling cycles under current-mode
Inside allow electric current to drop to 0, and in 2 controlling cycles electric current can be allowed to rise to designated value.Rest on the time delay of standing-by state
Can be self-defined by internal system, 100us is set as herein, it has been achieved in that the quick controllable switching of power direction.
Above-described embodiment is the utility model preferably implementation method, but implementation method of the present utility model is not by described
The limitation of embodiment, it is other it is any without departing from the change made under Spirit Essence of the present utility model and principle, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, be included within protection domain of the present utility model.
Claims (4)
1. it is a kind of based on state transfer bidirectional DC/DC system, it is characterised in that including two-way full-bridge converter, the two-way controls of DCDC
Device processed, the state shift module for working condition switching and limit and protection module are crossed, DCDC reversible controllers output is driven
Move signal to two-way full-bridge converter；
The state shift module is input into four kinds of signals, and respectively DCDC reversible controllers enable signal, DCDC reversible controllers
Mode altering signal, the inductance zero current indication signal of DCDC reversible controllers and the system exception input of limit and protection module excessively
Signal；The state shift module output current setting value switching signal and driving disability signal to DCDC reversible controllers；
It is described to cross voltage and current signal that limit is input into two-way full-bridge converter with protection module.
2. bidirectional DC/DC system according to claim 1, it is characterised in that the DCDC reversible controllers include operation
Platform, PWM analog controllers and control ring switch；
The operating desk includes that DCDC reversible controllers enable module, mode altering module and inductance zero current indicating module；
The PWM analog controllers include boosting and buck controller, and voltage step-up/step-down is realized in the presence of state shift module
Change；
The control ring switch includes Voltage loop and electric current loop.
3. bidirectional DC/DC system according to claim 1, it is characterised in that the state shift module includes delayed recovery
Operation module, error condition module, system mode machine and output signal logical operation module, the delayed recovery operation module and
Error condition module is connected with system mode machine, and system mode machine is connected with output logical operation.
4. bidirectional DC/DC system according to claim 1, it is characterised in that the two-way full-bridge converter includes big pressure difference
The two-way IGBT of starting protection, voltage sensor, current sensor, step-down full-bridge IGBT groups and boosting full-bridge IGBT groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620994980.6U CN206226286U (en) | 2016-08-30 | 2016-08-30 | A kind of bidirectional DC/DC system based on state transfer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620994980.6U CN206226286U (en) | 2016-08-30 | 2016-08-30 | A kind of bidirectional DC/DC system based on state transfer |
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| Publication Number | Publication Date |
|---|---|
| CN206226286U true CN206226286U (en) | 2017-06-06 |
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ID=58782188
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| CN201620994980.6U Withdrawn - After Issue CN206226286U (en) | 2016-08-30 | 2016-08-30 | A kind of bidirectional DC/DC system based on state transfer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208718A (en) * | 2016-08-30 | 2016-12-07 | 华南理工大学 | A kind of bidirectional DC/DC system and method based on state transfer |
| CN112671244A (en) * | 2020-12-03 | 2021-04-16 | 珠海格力电器股份有限公司 | Overcurrent protection device and method for BMS active equalization system and automobile |
-
2016
- 2016-08-30 CN CN201620994980.6U patent/CN206226286U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208718A (en) * | 2016-08-30 | 2016-12-07 | 华南理工大学 | A kind of bidirectional DC/DC system and method based on state transfer |
| CN112671244A (en) * | 2020-12-03 | 2021-04-16 | 珠海格力电器股份有限公司 | Overcurrent protection device and method for BMS active equalization system and automobile |
| CN112671244B (en) * | 2020-12-03 | 2024-03-26 | 珠海格力电器股份有限公司 | Overcurrent protection device and method of BMS active equalization system and automobile |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170606 Effective date of abandoning: 20190618 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170606 Effective date of abandoning: 20190618 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |