CN105553274B - A kind of bidirectional DC-DC converter electric current critical continuous mode unified control method - Google Patents
A kind of bidirectional DC-DC converter electric current critical continuous mode unified control method Download PDFInfo
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- CN105553274B CN105553274B CN201511001369.5A CN201511001369A CN105553274B CN 105553274 B CN105553274 B CN 105553274B CN 201511001369 A CN201511001369 A CN 201511001369A CN 105553274 B CN105553274 B CN 105553274B
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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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of two-way DC DC converter currents critical continuous mode unified control method disclosed by the invention, is related to the electric current critical continuous mode unified control method of double active two-way DC DC converters of bridge, belongs to field of power electronics.Control method disclosed by the invention by control transformer primary side and secondary side voltage and both between phase difference, converter is operated in transformer current critical continuous mode, reduce the circulation and conduction loss of converter.In addition, by boundary condition and control condition transformer current can be made to be in the pattern of critical continuous mode so that the reactive loss of circuit reduces, and the circulation loss of switching tube current stress and converter reduces, so as to improve the efficiency and reliability of converter.The present invention can also greatly reduce the complexity of control unit, realize control in real time.Present invention can apply to high-frequency isolation Switching Power Supply direction.
Description
Technical field
The present invention relates to a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method, more particularly to a kind of pair
The electric current critical continuous mode unified control method of active bridge bidirectional DC-DC converter, the high-frequency isolation for belonging to field of power electronics are opened
Powered-down source direction.
Background technology
With the development of Power Electronic Technique, two-way, high-frequency isolation, the demand of efficient converter are stepped up, especially
It is in the various electric power system occasions such as the solid-state transformer comprising energy-storage units, D.C. high voltage transmission, micro-capacitance sensor.These systems
Due to needing the energy hole to energy-storage units progress discharge and recharge, it is desirable to which converter has the characteristics that two-way controlled power stream.Separately
Outside, high transmission efficiency can improve the power density of whole converting means, increase reliability, cost-effective, therefore also become
Another important index.For foregoing application scenario, double active bridge bidirectional DC-DC converters widely should because it has
With prospect by numerous studies.
A kind of topology diagram of bidirectional DC-DC converter of common type is as shown in Figure 1, the topological structure is symmetrical junction
The full-bridge circuit that structure, transformer primary side and secondary side are all made of switching tube, described two full-bridge circuits are by a height
Frequency power transformer connects.The converter of this type is included in three controls variables, including two bridge arms of primary side full-bridge circuit
Voltage v between heart pointAB, the voltage v between two bridge arm central points of secondary side full-bridge circuitCD, and vABAnd vCDBetween shifting
To angle.Drive signal by controlling primary side switching tube can adjust voltage vABDuty cycle size；By controlling secondary side
The drive signal of switching tube can adjust voltage vCDDuty cycle size；By adjust primary side and secondary side switches pipe signal it
Between phase difference can realize to vABAnd vCDBetween the control for shifting to angle.Currently for double active bridge bidirectional DC-DC converters
Control method can be divided into two major classes：A) it is traditional singly to shift to control strategy, b) shift to plus PWM control strategies.Wherein shift to and add
PWM control strategies again can the control strategy of two control freedom degrees and the control strategy of three control freedom degrees.
2007 in IEEE Transaction on power electronics【Power electronics periodical】On ' the A that delivers
bidirectional DC-DC converter for an energy storage system with galvanic
An isolation ' texts, which use, traditional singly shifts to control strategy.This control strategy can realize the two-way flow control of power
System.But when the voltage fluctuation of energy storage side, its Sofe Switch condition will not meet, and circulation loss and conduction loss
It can increase.2012 in IEEE Transaction on power electronics【Power electronics periodical】On deliver
“Extended-phase-shift control of isolated bidirectional dc-dc converter for
Angle is shifted between the two active bridges of literary not only control of power distribution in microgrid " one, also control is each
Angle is shifted between two bridge arms of a active bridge.This method is summarized as adding PWM controlling parties containing two shifting to for the free degree
Method.This method can effectively reduce reactive loss and circulation loss, but introduce another control freedom degree, add control
Complexity, causes this control method to be difficult to calculate in real time.2012 in IEEE Transaction on power
electronics【Power electronics periodical】On " the Stability analysis of isolated that deliver
bidirectional dual active full-bridge dc-dc converter with triple phase shift
Control " belongs to adds PWM controls comprising three shifting to for control freedom degree.This method can further reduce the nothing of converter
Work(is lost and circulation loss, converter is operated in the optimum state of gamut input.However, control unit includes three freedom
Degree, makes control unit be difficult unified and calculate in real time.Moreover, the switching of converter working region therein adds answering for control
Miscellaneous degree.
The content of the invention
To overcome, double active bridge bidirectional DC-DC converter controller designs of foregoing common type are complicated, it is idle to reduce
Loss is uniformly controlled with relevant issues, a kind of bidirectional DC-DC converter electric current critical continuous modes disclosed by the invention such as conduction losses
Method, technical problems to be solved are that the topological structure offer for the bidirectional DC-DC converter for being directed to common type is a kind of double active
The method that bridge bidirectional DC-DC converter electric current critical continuous mode is uniformly controlled, reduces the reactive loss of circuit, reduces switch tube current
The circulation loss of stress and converter, improves the efficiency and reliability of converter；The complexity of control unit can be greatly reduced at the same time
Degree.
The purpose of the present invention is what is be achieved through the following technical solutions.
Double active bridge bidirectional DC-DC converters of common type include three control variables, including primary side full-bridge circuit
Two bridge arm central points between voltage vAB, the voltage v between two bridge arm central points of secondary side full-bridge circuitCD, Yi Jibian
Depressor primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle.A kind of bi-directional DC-DC disclosed by the invention becomes
Parallel operation electric current critical continuous mode unified control method, by by the given v of the output voltage of secondary siderefIt is defeated with actual secondary side
Go out sampled value V2Input of the difference as voltage controller, the output of controller is used to adjust transformer primary side voltage vABWith
Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle control signalAccording to shifting to angle control signalBoundary condition and transformation
Device primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween control condition can obtain be used for control transformer primary side
Voltage vABControl signal d1With control Circuit Fault on Secondary Transformer voltage vCDControl signal d2.By the boundary condition and
Control condition can make transformer current be in the pattern of critical continuous mode.According to shifting to angle control signalControl signal d1With
Control signal d2, driving generation unit produces corresponding switching tube driving control signal, so as to control the primary side of converter
Voltage vABWith Circuit Fault on Secondary Transformer voltage vCDAnd transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shifting
To angle Φ.The boundary condition and control condition can make transformer current be in the pattern of critical continuous mode, make converter
There is larger duty cycle in the case of equal output power and less shift to angle.So that the reactive loss of circuit subtracts
Small, the circulation loss of switching tube current stress and converter reduces, so as to improve the efficiency and reliability of converter.
The controller is only the control that can be achieved to the bidirectional DC-DC converter by a voltage controller
System, can reduce the complexity of control unit.The voltage controller preferred proportion integral PI controller.
The boundary condition is according to shifting to angle control signalBig I is divided into boundary condition (a) and boundary condition (b)
Two kinds：
When shifting to angle control signalDuring more than or equal to zero, then using boundary condition (a) such as shown in formula (1),
When shifting to angle control signalDuring less than zero, then using boundary condition (b) such as shown in formula (2),
Wherein V1, V2The active bridge DC voltage of primary side and secondary side respectively to converter；N for transformer once
No-load voltage ratio 1 of the side to secondary side：n.
Shown in the control condition such as formula (3).
nV1d1=V2d2 (3)
The converter is two-way topological structure, and primary side can be exchanged with secondary side.
A kind of bidirectional DC-DC converter electric current critical continuous mode unified control method disclosed by the invention, includes the following steps,
Step 1: determine that converter secondary side DC output voltage gives Vref；
Step 2: the active bridge DC voltage of the primary side and secondary side to converter samples, V is denoted as respectively1With
V2.Calculate output voltage set-point VrefWith V2Difference, input of the difference as output voltage regulator.The voltage
The output of adjuster is as transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle control signal
Step 3: according to shifting to angle control signalBoundary condition and transformer primary side voltage vABAnd transformer secondary
Side voltage vCDBetween control condition can obtain be used for control transformer primary side voltage vABControl signal d1And transformer
Secondary side voltage vCDControl signal d2.It can be in transformer current by the boundary condition and control condition to face
The continuous pattern in boundary.
Step 3.1, provide for solving control signal d1Or control signal d2Boundary condition.
When shifting to angle control signalDuring more than or equal to zero, then such as shown in formula (1), controlled using boundary condition (a)
Signal d processed1。
When shifting to angle control signalDuring less than zero, then using boundary condition (b) such as shown in formula (2), control letter is obtained
Number d2。
Wherein V1, V2The respectively active bridge DC voltage sampled value of the primary side of converter and secondary side, n is transformer
No-load voltage ratio 1 of the primary side to secondary side：n.
Step 3.2, provide shown in control condition such as formula (3).
nV1d1=V2d2 (3)
When shifting to angle control signalDuring more than or equal to zero, the control signal d that is obtained according to step 3.11Value, utilize public affairs
Formula (3) solves d2；When shifting to angle control signalDuring less than zero, the control signal d that is obtained according to step 3.12Value, utilize public affairs
Formula (3) solves d1；
Step 4: according to shifting to angle control signalBoundary condition and transformer primary side voltage vABWith transformer two
Secondary side voltage vCDBetween control condition can obtain be used for control transformer primary side voltage vABControl signal d1And transformation
Device secondary side voltage vCDControl signal d2.By driving generation unit, the drive signal of corresponding switching tube is produced, so that
Control the primary side voltage v of converterABWith Circuit Fault on Secondary Transformer voltage vCDAnd transformer primary side voltage vABWith transformer two
Secondary side voltage vCDBetween shift to angle Φ, make converter have in the case of equal output power larger duty cycle and compared with
Small shifts to angle.So that the reactive loss of circuit reduces, the circulation loss of switching tube current stress and converter reduces, so as to
Enough improve the efficiency and reliability of converter.
The drive signal of generation switching tube described in step 4 is depending on specific bidirectional DC-DC converter topology.
The drive signal of generation switching tube described in step 4, for common two-way double active bridge DC-DC converters, its
Including eight switching tube driving control signal, it is denoted as respectively：S1, S2, S3, S4, S5, S6, S7, S8.Eight switching tubes driving
Signal is characterized in that：All drive signals are all 50% square-wave signals；S1With S2Complementary, S3With S4Complementary, S5With S6Mutually
Mend, S7With S8It is complementary；S1Advanced S3Time by d1Control, S5Advanced S7Time by d2Control, S1And S5Between phase difference byControl.
The converter is two-way topological structure, and primary side can be exchanged with secondary side.
Beneficial effect：
1st, a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method disclosed by the invention, passes through control one
The drive signal of secondary side switching tube can adjust the voltage v between two bridge arm central points of primary side full-bridge circuitAB；Pass through control
The drive signal of secondary side switches pipe processed can adjust the voltage v between two bridge arm central points of secondary side full-bridge circuitCD；Pass through
The phase difference adjusted between primary side and secondary side switches pipe signal can be realized to vABAnd vCDBetween the control for shifting to angle.
Pass through foregoing control so that the siding-to-siding block length that transformer current is zero when converter works is very of short duration, in critical continuous mode, drop
Low circulation loss and conduction loss.
2nd, a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method disclosed by the invention, can only lead to
Cross the voltage v between two bridge arm central points of a controller realization adjusting primary side full-bridge circuitAB, secondary side full-bridge circuit
Voltage v between two bridge arm central pointsCDAnd vABAnd vCDBetween shift to being uniformly controlled for angle.The method need not incite somebody to action
During control data are stored in advance in and table look-up, real-time control can be realized, control loop is simple, reliably.
3rd, a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method disclosed by the invention so that electricity
The reactive loss on road reduces, and the circulation loss of switching tube current stress and converter reduces, so as to improve the effect of converter
Rate and reliability.
Brief description of the drawings
Fig. 1 is double active bridge bidirectional DC-DC converter electrical block diagrams of the present embodiment；
Fig. 2 is the unified control method block diagram of the electric current critical continuous mode of the present embodiment；
Fig. 3 is the main oscillogram of this example.
Embodiment
The present invention is described in detail below in conjunction with drawings and examples, while also describes technical solution of the present invention
The technical problem and beneficial effect of solution, it should be pointed out that described embodiment is intended merely to facilitate the understanding of the present invention,
And any restriction effect is not played to it.
Embodiment 1：
Illustrate a kind of two-way DC- disclosed by the invention exemplified by controlling a kind of bidirectional DC-DC converter of common type
The realizability and beneficial effect of DC converter current critical continuous mode unified control methods.
Double active bridge bidirectional DC-DC converters of common type are as shown in Figure 1.As shown in the figure, converter is two-way double
Active bridge DC-DC converter, primary side are an active full-bridge circuit, and secondary side is also an active full-bridge circuit.A, B point minute
Not Wei the active bridge of primary side two respective midpoints of bridge arm；C, D point be respectively two bridge arms of the active bridge of secondary side it is respective in
Point；vABFor the voltage difference between A points and B points；vCDFor the voltage difference between C points and D points.ipAnd isFor the transformer one of converter
Secondary side and the electric current of secondary side.V1For the DC voltage of primary side；V2For the DC voltage of secondary side.
Control block diagram is as shown in Figure 2 used by the present embodiment.With reference to Fig. 2, a kind of bi-directional DC-DC disclosed in the present embodiment
Converter current critical continuous mode unified control method, includes the following steps,
Step 1: determine that converter secondary side DC output voltage gives Vref；
Step 2: the active bridge DC voltage of the primary side and secondary side to converter samples, V is denoted as respectively1With
V2.Calculate output voltage set-point VrefWith V2Difference, input of the difference as output voltage regulator.The voltage
The output of controller is as transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle control signal
Wherein, the output of controller needs positive and negative amplitude limit.
Step 3: according to shifting to angle control signalBoundary condition and transformer primary side voltage vABAnd transformer secondary
Side voltage vCDBetween control condition can obtain be used for control transformer primary side voltage vABControl signal d1And transformer
Secondary side voltage vCDControl signal d2.It can be in transformer current by the boundary condition and control condition to face
The continuous pattern in boundary.
Step 3.1, provide for solving control signal d1Or control signal d2Boundary condition.
When shifting to angle control signalDuring more than or equal to zero, then such as shown in formula (1), controlled using boundary condition (a)
Signal d processed1。
When shifting to angle control signalDuring less than zero, then using boundary condition (b) such as shown in formula (2), control letter is obtained
Number d2。
Wherein V1, V2The respectively active bridge DC voltage of the primary side of converter and secondary side, n are transformer primary side
To the no-load voltage ratio 1 of secondary side：n.
Step 3.2, provide shown in control condition such as formula (3).
nV1d1=V2d2 (3)
When shifting to angle control signalDuring more than or equal to zero, the control signal d that is obtained according to step 3.11Value, utilize public affairs
Formula (3) solves d2；When shifting to angle control signalDuring less than zero, the control signal d that is obtained according to step 3.12Value, utilize public affairs
Formula (3) solves d1；
Step 4: according to shifting to angle control signalBoundary condition and transformer primary side voltage vABAnd transformer secondary
Side voltage vCDBetween control condition can obtain be used for control transformer primary side voltage vABControl signal d1And transformer
Secondary side voltage vCDControl signal d2The drive signal of switching tube is produced, so as to control the primary side voltage v of converterABAnd change
Depressor secondary side voltage vCDAnd transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle Φ, make
Obtain transformer current and be in critical continuous mode state so that the reactive loss reduction of circuit, switching tube current stress and converter
Circulation loss reduces, so as to improve the efficiency and reliability of converter.
Control method and its circuit topology course of work described in the present embodiment is as follows：
After converter starts power up work, for V2The adjuster of voltage, when secondary side voltage is less than the given V of voltageref
When, the power of converter is by V1Side is transferred to V2Side.Digitial controller (DSP TMS320F28335) passes through sensor sample V2Side
DC voltage as feedback.By Vref-V2Value by digital pi regulator and limiter, the value of outputHave as two
Shift to control signal between the bridge of source, this shift to control signal numerical value be on the occasion of.Obtain output control valueAfterwards, side is utilized
Boundary's condition (a) calculates V2Control signal is shifted between two bridge arms of the active bridge in side, is denoted as d1.Boundary condition (a) is represented by：N is no-load voltage ratio (1 of the transformer primary side to secondary side：n).D is calculated1And then utilize relation
Formula：nV1d1=V2d2, you can calculate V1Control signal d is shifted between two bridge arms of the active bridge in side2.Such a control method
In boundary condition (a) can ensure the transformer current critical continuous mode (i in waveform such as Fig. 3pAnd isIt is shown), in Same Efficieney
In the case of, the peak value and virtual value of electric current are smaller, reduce loss, improve efficiency.
When secondary side voltage is higher than the given V of voltagerefWhen, the power of converter is by V2Side is transferred to V1Side.It is digital control
Device (DSP TMS320F28335) passes through sensor sample V2The DC voltage of side is as feedback.By Vref-V2Value by numeral
Pi regulator and limiter, the value of outputControl signal is shifted to as between two active bridges.At this time, control signal is shifted to
Numerical value be negative value.Obtain output control valueAfterwards, V is calculated using boundary condition (b)1Between two bridge arms of the active bridge in side
Control signal is shifted to, is denoted as d2.Wherein, boundary condition (b) is represented by：N for transformer once
No-load voltage ratio (1 of the side to secondary side：n).D is calculated2And then utilize relational expression：nV1d1=V2d2, you can calculate V2Side has
Control signal d is shifted between two bridge arms of source bridge1.Boundary condition (a) in such a control method can ensure transformer
Electric current critical continuous mode, in the case of Same Efficieney, the peak value and virtual value of electric current are smaller, reduce loss, improve efficiency.
Driving generation unit is obtained by preceding methodd1And d2Three control variables produce corresponding drive signal,
Including S1,S2,S3,S4,S5,S6,S7,S8.The sequence diagram of drive signal and interlock circuit waveform are as shown in Figure 3.Eight drive signals
It is described as in sequential：All drive signals are all 50% square-wave signals；S1With S2Complementary, S3With S4Complementary, S5With S6
Complementary, S7With S8It is complementary；S1Advanced S3Time by d1Control, S5Advanced S7Time by d2Control, S1And S5Between phase difference
ByControl.
Utilized1And d2Control eight drive signals, you can control the transformer primary winding voltage v of converterab,
Secondary side winding voltage vcd, and vabWith vcdPhase difference.Realize the Power Control to converter.When output power needs to increase
When big, V2The output of side DC terminal voltage controllerIt can increase, so as to increase vabWith vcdBetween phase shifting angle, improve output work
Rate；When output power reduces, V2The output of side DC terminal voltage controllerIt can reduce, so as to reduce vabWith vcdBetween shifting
Phase angle, reduces output power.Only by a controller, the multivariable Control of power is can be achieved with, simplifies design process.
In addition, the control method can ensure that transformer winding electric current remains critical continuous mode under different loads.Meanwhile convert
Device does not all have reactive loss under any load.
Above-described specific descriptions, are further elaborated the purpose, technical solution and beneficial effect of invention,
It should be understood that the foregoing is merely the specific embodiment of the present invention, the protection domain being not intended to limit the present invention,
Within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done, should be included in the present invention's
Within protection domain.
Claims (7)
- A kind of 1. bidirectional DC-DC converter electric current critical continuous mode unified control method, it is characterised in that：By by the defeated of secondary side Go out the given v of voltagerefWith the output voltage sampled value V of actual secondary side2Input of the difference as voltage controller, control The output of device is used to adjust transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle control signal According to shifting to angle control signalBoundary condition and transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween Control condition, can obtain transformer primary side voltage vABControl signal d1With Circuit Fault on Secondary Transformer voltage vCDControl signal d2；By the boundary condition and control condition transformer current can be made to be in the pattern of critical continuous mode；According to shifting to Angle control signalControl signal d1With control signal d2, driving generation unit, which produces corresponding switching tube drive control, to be believed Number, so as to control the primary side voltage v of transformerABWith Circuit Fault on Secondary Transformer voltage vCDAnd transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle Φ；The boundary condition and control condition can make at transformer current In the pattern of critical continuous mode so that the reactive loss of circuit reduces, and the circulation loss of switching tube current stress and converter reduces, So as to improve the efficiency and reliability of converter.
- 2. a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method according to claim 1, its feature exist In：The controller is only the control that can be achieved to the bidirectional DC-DC converter by a voltage controller, can Reduce the complexity of control unit；The voltage controller is proportional integration PI controllers.
- 3. a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method according to claim 1 or 2, it is special Sign is：The boundary condition is according to shifting to angle control signalBig I is divided into boundary condition (a) and boundary condition (b) two Kind；When shifting to angle control signalDuring more than or equal to zero, then using boundary condition (a) such as shown in formula (1),When shifting to angle control signalDuring less than zero, then using boundary condition (b) such as shown in formula (2),Wherein V1, V2The active bridge DC voltage sampled value of primary side and secondary side respectively to converter；N is transformer one No-load voltage ratio 1 of the secondary side to secondary side：n.
- 4. a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method according to claim 3, its feature exist In：The converter is two-way topological structure, and primary side can be exchanged with secondary side.
- A kind of 5. bidirectional DC-DC converter electric current critical continuous mode unified control method, it is characterised in that：Include the following steps,Step 1: determine that converter secondary side DC output voltage gives Vref；Step 2: the active bridge DC voltage of the primary side and secondary side to converter samples, V is denoted as respectively1And V2；Meter Calculate output voltage set-point VrefWith V2Difference, input of the difference as output voltage regulator；The voltage is adjusted The output of device is as transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween shift to angle control signalStep 3: according to shifting to angle control signalBoundary condition and transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween control condition can obtain be used for control transformer primary side voltage vABControl signal d1And Circuit Fault on Secondary Transformer Voltage vCDControl signal d2；By the boundary condition and control condition transformer current can be made to be in critical continuous mode Pattern；Step 3.1, provide for solving control signal d1Or control signal d2Boundary condition；When shifting to angle control signalDuring more than or equal to zero, then such as shown in formula (1), control signal is obtained using boundary condition (a) d1；When shifting to angle control signalDuring less than zero, then such as shown in formula (2), control signal d is obtained using boundary condition (b)2；Wherein V1, V2The respectively active bridge DC voltage sampled value of the primary side of converter and secondary side, n for transformer once No-load voltage ratio 1 of the side to secondary side：n；Step 3.2, provide shown in control condition such as formula (3)；nV1d1=V2d2 (3)When shifting to angle control signalDuring more than or equal to zero, the control signal d that is obtained according to step 3.11Value, utilize formula (3) Solve d2；When shifting to angle control signalDuring less than zero, the control signal d that is obtained according to step 3.12Value, utilize formula (3) Solve d1；Step 4: according to shifting to angle control signalBoundary condition and transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween control condition can obtain be used for control transformer primary side voltage vABControl signal d1And Circuit Fault on Secondary Transformer Voltage vCDControl signal d2；Corresponding switching tube drive signal is produced by driving unit, so as to control transformer once Side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDAnd transformer primary side voltage vABWith Circuit Fault on Secondary Transformer voltage vCDBetween Angle Φ is shifted to, transformer current is in the pattern of critical continuous mode so that the reactive loss of circuit reduces, switching tube current stress Reduce with the circulation loss of converter, so as to improve the efficiency and reliability of converter.
- 6. a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method according to claim 5, its feature exist In：The drive signal of generation switching tube described in step 4 is depending on specific bidirectional DC-DC converter topology.
- 7. a kind of bidirectional DC-DC converter electric current critical continuous mode unified control method according to claim 5, its feature exist In：The drive signal of generation switching tube described in step 4, for common two-way double active bridge DC-DC converters, it includes Eight switching tube driving control signal, are denoted as respectively：S1, S2, S3, S4, S5, S6, S7, S8；Eight switching tube drive signals It is characterized in that：All drive signals are all 50% square-wave signals；S1With S2Complementary, S3With S4Complementary, S5With S6Complementary, S7 With S8It is complementary；S1Advanced S3Time by d1Control, S5Advanced S7Time by d2Control, S1And S5Between phase difference byControl System.
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