CN110277917A - The urban transportation and its bidirectional DC-DC converter and control method - Google Patents
The urban transportation and its bidirectional DC-DC converter and control method Download PDFInfo
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- CN110277917A CN110277917A CN201810205943.6A CN201810205943A CN110277917A CN 110277917 A CN110277917 A CN 110277917A CN 201810205943 A CN201810205943 A CN 201810205943A CN 110277917 A CN110277917 A CN 110277917A
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Classifications
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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
- H02M3/33569—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
- H02M3/33584—Bidirectional converters
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
The invention discloses a kind of the urban transportation and its bidirectional DC-DC converter and control method, method includes: the output electric current and output voltage for sampling any one DC-DC conversion module in the first DC-DC conversion module and the 2nd DC-DC conversion module；Control signal is generated according to the output electric current of sampling module sampling and output voltage, and the first DC-DC conversion module and the 2nd DC-DC conversion module are controlled respectively using synchronously driven mode according to the control signal, it is balanced with the voltage to the first node, so as to increase output power by two groups of DC-DC conversion module parallel connections, and the voltage that can balance first node guarantees the stabilization of front end capacitance voltage.
Description
Technical field
The present invention relates to power electronics field, in particular to a kind of bidirectional DC-DC converter, a kind of rail traffic supply
Electric system, a kind of control method of bidirectional DC-DC converter.
Background technique
Bidirectional DC-DC converter is always the important component part of field of power electronics, along with the development of vehicular field,
DC-DC converter also has become one of important spare part on train.To meet the needs of output power, the relevant technologies needs change
Into.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of control method of bidirectional DC-DC converter, be increased by two groups of DC-DC conversion module parallel connections defeated
Power out, and the voltage that can balance first node guarantees the stabilization of front end capacitance voltage.
It is another object of the present invention to propose a kind of bidirectional DC-DC converter.
Yet another object of the invention is that proposing a kind of the urban transportation.
In order to achieve the above objectives, a kind of control method for bidirectional DC-DC converter that one aspect of the present invention embodiment proposes,
The bidirectional DC-DC converter includes first capacitor, the second capacitor, the first DC-DC conversion module and the 2nd DC-DC transformation mould
Block, the first capacitor connect with second capacitor after at the both ends for being parallel to DC power supply, the first capacitor with it is described
There is first node, the first end and second end of the first DC-DC conversion module is connected respectively to described between second capacitor
The first end and second end at the both ends of first capacitor, the 2nd DC-DC conversion module is connected respectively to second capacitor
The third end at both ends, the 2nd DC-DC conversion module is connected with the third end of the first DC-DC conversion module, and described
4th end of two DC-DC conversion modules is connected with the 4th end of the first DC-DC conversion module, the control method include with
Lower step: it samples any one DC-DC in the first DC-DC conversion module and the 2nd DC-DC conversion module and converts mould
The output electric current and output voltage of block；Control signal is generated according to the output electric current of sampling module sampling and output voltage,
And use synchronously driven mode respectively to the first DC-DC conversion module and the 2nd DC- according to the control signal
DC conversion module is controlled, and is balanced with the voltage to the first node.
The control method of the bidirectional DC-DC converter proposed according to embodiments of the present invention passes through sampling the first DC-DC transformation
The output electric current and output voltage of any one DC-DC conversion module in module and the 2nd DC-DC conversion module, then basis is adopted
The output electric current and output voltage of egf block sampling generate control signal, and according to control signal using synchronously driven mode point
It is other that first DC-DC conversion module and the 2nd DC-DC conversion module are controlled, it is controlled with the voltage to first node.
The control method of the embodiment of the present invention as a result, can increase output power, and energy by two groups of DC-DC conversion module parallel connections
The voltage of enough active balance first nodes, avoids front end capacitance voltage excessive, pressure voltage needed for reducing front end capacitor, and then reduces
Production cost.
According to one embodiment of present invention, the control method of the bidirectional DC-DC converter further include: to described
The voltage of one node is fed back, and is compensated according to the voltage of the first node of feedback to the control signal, with
Just the first DC-DC conversion module and the 2nd DC-DC conversion module are controlled according to compensated control signal,
So that the voltage of the first node keeps balance.
According to one embodiment of present invention, output to the first DC-DC conversion module and the 2nd DC-DC converts
The frequency of the control signal of module is identical with duty ratio.
According to one embodiment of present invention, the control signal is carried out according to the voltage of the first node of feedback
Compensation, comprising: frequency of amendment is generated according to the voltage of the first node of feedback, and by the frequency of amendment and the control
The frequency of signal is overlapped.
According to one embodiment of present invention, the first capacitor is identical as the specifications and models of second capacitor, described
First DC-DC conversion module is identical as the hardware parameter of the 2nd DC-DC conversion module.
In order to achieve the above objectives, a kind of bidirectional DC-DC converter that another aspect of the present invention embodiment proposes, comprising: the
One capacitor and the second capacitor, the first capacitor is parallel to the both ends of DC power supply again after connecting with second capacitor, described
There is first node between first capacitor and second capacitor；First DC-DC conversion module, the first DC-DC convert mould
The first end and second end of block is connected respectively to the both ends of the first capacitor；2nd DC-DC conversion module, the 2nd DC-
The first end and second end of DC conversion module is connected respectively to the both ends of second capacitor, the 2nd DC-DC conversion module
Third end be connected with the third end of the first DC-DC conversion module, the 4th end of the 2nd DC-DC conversion module and institute
The 4th end for stating the first DC-DC conversion module is connected；Sampling module, the sampling module become for sampling the first DC-DC
Change the mold the output electric current and output voltage of any one DC-DC conversion module in block and the 2nd DC-DC conversion module；Control
Module, the output electric current and output voltage that the control module is used to be sampled according to the sampling module generate control signal, and
According to the control signal using synchronously driven mode respectively to the first DC-DC conversion module and the 2nd DC-DC
Conversion module is controlled, and is balanced with the voltage to the first node.
The bidirectional DC-DC converter proposed according to embodiments of the present invention, first capacitor are in parallel again after connecting with the second capacitor
To the both ends of DC power supply, there is first node, the first end of the first DC-DC conversion module between first capacitor and the second capacitor
The both ends of first capacitor are connected respectively to second end, the first end and second end of the 2nd DC-DC conversion module is connected respectively to
The third end at the both ends of the second capacitor, the 2nd DC-DC conversion module is connected with the third end of the first DC-DC conversion module, and second
4th end of DC-DC conversion module is connected with the 4th end of the first DC-DC conversion module, and sampling module samples the first DC-DC and becomes
Change the mold the output electric current and output voltage of any one DC-DC conversion module in block and the 2nd DC-DC conversion module, control module
Control signal is generated according to the output electric current of sampling module sampling and output voltage, and according to control signal using synchronously driven
Mode respectively controls the first DC-DC conversion module and the 2nd DC-DC conversion module, is carried out with the voltage to first node
Balance.The converter of the embodiment of the present invention can increase output power by two groups of DC-DC conversion module parallel connections as a result, and
It is capable of the voltage of active balance first node, avoids front end capacitance voltage excessive, pressure voltage needed for reducing front end capacitor, and then drop
Low production cost.
According to one embodiment of present invention, the bidirectional DC-DC converter further include: mid-point voltage feedback module,
The mid-point voltage feedback module is used for the Voltage Feedback of the first node to the control module, and the control module is also
For being compensated according to the voltage of the first node to the control signal, so as to according to compensated control signal to institute
It states the first DC-DC conversion module and the 2nd DC-DC conversion module is controlled, so that the voltage of the first node is kept
Balance.
According to one embodiment of present invention, output to the first DC-DC conversion module and the 2nd DC-DC converts
The frequency of the control signal of module is identical with duty ratio.
According to one embodiment of present invention, the first capacitor is identical as the specifications and models of second capacitor, described
First DC-DC conversion module is identical as the hardware parameter of the 2nd DC-DC conversion module.
According to one embodiment of present invention, when the control module compensates the control signal, according to described
The voltage of first node generates frequency of amendment, and the frequency of the frequency of amendment and the control signal is overlapped.
In order to achieve the above objectives, a kind of the urban transportation that another aspect of the present invention embodiment proposes, including institute
The bidirectional DC-DC converter stated.
The urban transportation proposed according to embodiments of the present invention can pass through two by bidirectional DC-DC converter
Group DC-DC conversion module parallel connection increases output power, and is capable of the voltage of active balance first node, avoids front end capacitor electric
Big, pressure voltage needed for reducing front end capacitor is pressed through, and then reduces production cost.
Detailed description of the invention
Fig. 1 is the flow chart according to the control method of the bidirectional DC-DC converter of the embodiment of the present invention.
Fig. 2 is the circuit diagram according to the bidirectional DC-DC converter of one embodiment of the invention；
Fig. 3 is the block diagram according to the bidirectional DC-DC converter of the embodiment of the present invention；
Fig. 4 is the block diagram according to the bidirectional DC-DC converter of one embodiment of the invention；
Fig. 5 is the control principle drawing according to the bidirectional DC-DC converter of one embodiment of the invention；
Fig. 6 is the block diagram according to the urban transportation of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition bidirectional DC-DC converter, the urban transportation
And the control method of bidirectional DC-DC converter.
Fig. 1 is the control method according to the bidirectional DC-DC converter of the embodiment of the present invention.As shown in Fig. 2, bi-directional DC-DC
Converter includes first capacitor, the second capacitor, the first DC-DC conversion module and the 2nd DC-DC conversion module, first capacitor and the
There is first node, the first DC- between the both ends for being parallel to DC power supply, first capacitor and the second capacitor after the series connection of two capacitors
The first end and second end of DC conversion module is connected respectively to the both ends of first capacitor, the first end of the 2nd DC-DC conversion module
The both ends of the second capacitor, the third end of the 2nd DC-DC conversion module and the first DC-DC conversion module are connected respectively to second end
Third end be connected, the 4th end of the 2nd DC-DC conversion module is connected with the 4th end of the first DC-DC conversion module.Wherein, exist
Bidirectional DC-DC converter is 1500V bidirectional DC-DC converter in the embodiment of the present invention.Wherein, the first DC-DC conversion module and
2nd DC-DC conversion module is two-way H bridge DC chopper circuit.
As shown in Figure 1, the control method for the bidirectional DC-DC converter that the embodiment of the present invention proposes, comprising the following steps:
S1: any one DC-DC conversion module in the first DC-DC conversion module of sampling and the 2nd DC-DC conversion module
Export electric current and output voltage.
Specifically, it can be sampled by sampling module any one in the first DC-DC conversion module and the 2nd DC-DC conversion module
The output electric current and output voltage of a DC-DC conversion module.For example, sampling module can be with the output of the first DC-DC conversion module
End is connected, and is sampled with the output electric current and output voltage that convert to the first DC-DC.
S2: control signal is generated according to the output electric current of sampling module sampling and output voltage, and is adopted according to control signal
The first DC-DC conversion module and the 2nd DC-DC conversion module are controlled respectively with synchronously driven mode, to first segment
The voltage of point is balanced.
It should be understood that synchronous driving is while controlling, that is to say, that according to control signal using synchronously driven
Mode respectively controls the first DC-DC conversion module and the 2nd DC-DC conversion module, as, simultaneously according to control signal
First DC-DC conversion module and the 2nd DC-DC conversion module are controlled, specifically, as shown in Fig. 2, according to control signal
The first switch tube Q1 and the 4th switching tube Q4 in the first DC-DC conversion module, Yi Ji can be driven simultaneously in forward conduction
The 9th switching tube Q9 and the 12nd switching tube Q12 in two DC-DC conversion modules are switched on or off simultaneously, can in reverse-conducting
Third switching tube Q3 in the first DC-DC conversion module of driving and second switch Q2 and the 2nd DC-DC conversion module simultaneously
In the tenth switching tube Q10 and the 11st switching tube Q11 be switched on or off simultaneously.
According to one embodiment of present invention, first capacitor is identical as the specifications and models of the second capacitor, the first DC-DC transformation
Module is identical as the hardware parameter of the 2nd DC-DC conversion module.
It should be noted that first capacitor and the second capacitor are derided capacitors, i.e. first capacitor and the second capacitor is respectively straight
The voltage in galvanic electricity source, to provide identical voltage, i.e. first segment to the first DC-DC conversion module and the 2nd DC-DC conversion module
The balance of voltage at point, but two partial pressure when the first DC-DC conversion module and inconsistent the 2nd DC-DC conversion module output power
The voltage of capacitor can generate deviation, i.e. mid-point voltage is uneven, therefore, can be according to control signal to the first DC-DC conversion module
It synchronizes and is driven so that the voltage of first node keeps balance with the 2nd DC-DC conversion module.
That is, can be sampled by sampling module any in the first DC-DC conversion module and the 2nd DC-DC conversion module
The output electric current and output voltage of one DC-DC conversion module, it is raw according to the output electric current of sampling module sampling and output voltage
Use synchronously driven mode respectively to the first DC-DC conversion module and the 2nd DC-DC at control signal, and according to control signal
Conversion module is controlled, i.e., is controlled according to control signal to the first DC-DC conversion module and the 2nd DC-DC conversion module
System, and keep the output power of the first DC-DC conversion module and the 2nd DC-DC conversion module consistent, specifically, output to first
The frequency of the control signal of DC-DC conversion module and the 2nd DC-DC conversion module is identical with duty ratio, to make first node
The balance of voltage.
The embodiment of the present invention increases output power in such a way that two groups of DC-DC conversion modules are in parallel as a result, then basis
The output electric current and output voltage of first DC-DC conversion module or the 2nd DC-DC conversion module to the first DC-DC conversion module and
2nd DC-DC conversion module synchronizes driving, can make the balance of voltage of first node, i.e. guarantee first capacitor and the second electricity
The voltage of appearance is maintained at the half of direct current power source voltage, to make the pressure voltage direct current of first capacitor and the second capacitor
Production is effectively reduced so that first capacitor and the second capacitor can carry out type selecting according to the half of DC power supply in the half of source voltage
Cost.
According to one embodiment of present invention, the control method of bidirectional DC-DC converter further include: to the electricity of first node
Pressure is fed back, and is compensated according to the voltage of the first node of feedback to control signal, so as to according to compensated control
Signal controls the first DC-DC conversion module and the 2nd DC-DC conversion module, so that the voltage of first node keeps flat
Weighing apparatus.
It should be noted that the problems such as being influenced due to electrical components by actual processing procedure and material, will lead to first device
Part parameter has deviation, and then leads to the Voltage unbalance of first node.Based on this, in order to solve to cause due to component parameter
Voltage unbalance, increase a midpoint feedforward controlling unit so that first node voltage keep balance.
Specifically, midpoint feedback module can be increased in 1500V bidirectional DC-DC converter, mid-point voltage feedback module can
It acquires the voltage of first node and is fed back, control signal is compensated according to the voltage of first node, according to compensation
Control signal afterwards controls the first DC-DC conversion module and the 2nd DC-DC conversion module, so that the voltage of first node
Keep balance.
Wherein, control signal is compensated according to the voltage of the first node of feedback, comprising: according to the first segment of feedback
The voltage of point generates frequency of amendment, and the frequency of frequency of amendment and control signal is overlapped.
For example, sampling module can sample the output electric current and output voltage of the first DC-DC conversion module, mid-point voltage
Feedback module detects the voltage and feedback of first node, generates control according to the output electric current of sampling module sampling and output voltage
Signal, and compensated according to the voltage of first node and generate compensated control signal, then according to control signal to first
DC-DC conversion module is controlled, and is controlled according to compensated control signal the 2nd DC-DC conversion module.
In conclusion the control method of the bidirectional DC-DC converter proposed according to embodiments of the present invention, passes through sampling first
The output electric current and output voltage of any one DC-DC conversion module in DC-DC conversion module and the 2nd DC-DC conversion module,
Then control signal is generated according to the output electric current of sampling module sampling and output voltage, and is driven according to control signal using synchronous
Dynamic mode respectively controls the first DC-DC conversion module and the 2nd DC-DC conversion module, with the voltage to first node
It is controlled.The control method of the embodiment of the present invention as a result, can increase output work by two groups of DC-DC conversion module parallel connections
Rate, and it is capable of the voltage of active balance first node, avoid front end capacitance voltage excessive, pressure resistance needed for reducing front end capacitor
Value, and then reduce production cost.
Fig. 3 is the block diagram according to the bidirectional DC-DC converter of the embodiment of the present invention.As shown in Figures 2 and 3, this hair
The bidirectional DC-DC converter of bright embodiment includes: first capacitor C1, the second capacitor C2, the first DC-DC conversion module 10, second
DC-DC conversion module 20, sampling module 30 and control module 40.
Wherein, first capacitor C1 is parallel to the both ends of DC power supply DC again after connecting with the second capacitor C2；First capacitor C1
There is first node J1 between the second capacitor C2, the first end 11 and second end 12 of the first DC-DC conversion module 10 connect respectively
The both ends of first capacitor C1 are connected to, the first end 21 and second end 22 of the 2nd DC-DC conversion module 20 are connected respectively to the second electricity
Holding the both ends of C2, the third end 23 of the 2nd DC-DC conversion module 20 is connected with the third end 13 of the first DC-DC conversion module 10,
4th end 24 of the 2nd DC-DC conversion module 20 is connected with the 4th end 14 of the first DC-DC conversion module；Sampling module 30 is used for
Sample the output electric current of any one DC-DC conversion module in the first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20
And output voltage；The output electric current and output voltage that control module 40 is used to be sampled according to sampling module 30 generate control signal,
And use synchronously driven mode respectively to the first DC-DC conversion module 10 and the 2nd DC-DC conversion module according to control signal
20 are controlled, and are balanced with the voltage to first node J1.
Wherein, sampling module 30 can be connected with the output end of the first DC-DC conversion module 10, to convert to the first DC-DC
10 output electric current and output voltage is sampled.
Wherein, bidirectional DC-DC converter is 1500V bidirectional DC-DC converter, the first DC-DC in embodiments of the present invention
Conversion module 10 and the 2nd DC-DC conversion module 20 are two-way H bridge DC chopper circuit.
According to one embodiment of present invention, first capacitor C1 is identical as the specifications and models of the second capacitor C2, the first DC-DC
Conversion module 10 is identical as the hardware parameter of the 2nd DC-DC conversion module 20.
It should be noted that first capacitor C1 and the second capacitor C2 is derided capacitors, i.e. first capacitor C1 and the second capacitor
C2 divides equally the voltage of DC power supply DC, identical to provide to the first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20
Voltage, the i.e. balance of voltage at first node, but when the first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20 export
The voltage of two derided capacitors can generate deviation when power is inconsistent, i.e. mid-point voltage is uneven, therefore, can become to the first DC-DC
Mold changing block 10 and the 2nd DC-DC conversion module 20, which synchronize, to be driven so that the voltage of first node J1 keeps balance.
It should be understood that synchronous driving is while controlling, that is to say, that according to control signal using synchronously driven
Mode respectively controls the first DC-DC conversion module and the 2nd DC-DC conversion module, as, simultaneously according to control signal
First DC-DC conversion module and the 2nd DC-DC conversion module are controlled, specifically, according to control signal in forward conduction
When can drive first switch tube Q1 in the first DC-DC conversion module and the 4th switching tube Q4 and the 2nd DC-DC transformation simultaneously
The 9th switching tube Q9 and the 12nd switching tube Q12 in module are switched on or off simultaneously, can drive simultaneously in reverse-conducting
It third switching tube Q3 and second switch Q2 in one DC-DC conversion module and the in the 2nd DC-DC conversion module the tenth opens
Pipe Q10 and the 11st switching tube Q11 is closed to be switched on or off simultaneously.
Appoint that is, sampling module 30 can sample in the first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20
It anticipates the output electric current and output voltage of a DC-DC conversion module, control module 40 receives the output electricity that sampling module 30 samples
Stream and output voltage, and control signal is generated according to output electric current and output voltage, control module 40 is used according to control signal
Synchronously driven mode respectively controls the first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20, i.e. control mould
Block 40 simultaneously controls the first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20 according to control signal, and makes the
One DC-DC conversion module 10 is consistent with the output power of the 2nd DC-DC conversion module 20, and specifically, output to the first DC-DC becomes
It is identical with duty ratio with the frequency of the control signal of the 2nd DC-DC conversion module 20 to change the mold block 10, to make first node J1's
The balance of voltage.
The embodiment of the present invention increases output power in such a way that two groups of DC-DC conversion modules are in parallel as a result, according to first
The output electric current and output voltage of DC-DC conversion module or the 2nd DC-DC conversion module are to the first DC-DC conversion module and second
DC-DC conversion module synchronizes driving, can make the balance of voltage of first node, i.e. guarantee first capacitor and the second capacitor
Voltage is maintained at the half of direct current power source voltage, to make the pressure voltage DC power supply electricity of first capacitor and the second capacitor
Production cost is effectively reduced so that first capacitor and the second capacitor can carry out type selecting according to the half of DC power supply in the half of pressure.
According to one embodiment of present invention, as shown in figure 4, bidirectional DC-DC converter further includes mid-point voltage feedback mould
Block 50, mid-point voltage feedback module 50 are used for the Voltage Feedback of first node J1 to control module 40, and control module 40 is also used
In being compensated according to the voltage of first node J1 to control signal, so as to according to compensated control signal to the first DC-DC
Conversion module 10 and the 2nd DC-DC conversion module 20 are controlled, so that the voltage of first node J1 keeps balance.
It should be noted that will lead to component parameter since electrical components are influenced by actual processing procedure and material
There is deviation, and then leads to the Voltage unbalance of first node J1.Based on this, in order to solve the voltage as caused by component parameter
Imbalance increases the controlling unit of midpoint feedforward, so that the voltage of first node J1 keeps balance.
Specifically, as shown in figure 4, increasing mid-point voltage feedback module 50, midpoint in 1500V bidirectional DC-DC converter
Voltage feedback module 50 acquires the voltage of first node J1 and feeds back to control module 40, and control module 40 receives mid-point voltage
The voltage for the first node J1 that feedback module 50 is sent, and control signal is compensated according to the voltage of first node J1, with
The first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20 are controlled according to compensated control signal, so that the
The voltage of one node J1 keeps balance.
For example, as shown in figure 4, sampling module 30 can sample the output electric current of the first DC-DC conversion module 10 and defeated
Voltage and it is sent to control module 40 out, the voltage that mid-point voltage feedback module 50 detects first node J1 simultaneously feeds back to control mould
Block 40, the output electric current and output voltage that control module 40 is sampled according to sampling module 30 generate control signal, and according to midpoint
The voltage for the first node J1 that voltage feedback module 50 detects compensates control signal and generates compensated control signal, control
Molding block 40 can control the first DC-DC conversion module 10 according to control signal, and according to compensated control signal pair
2nd DC-DC conversion module 20 is controlled.
According to one embodiment of present invention, as shown in figure 5, when 40 pairs of control signals of control module compensate, according to
The voltage of first node J1 generates frequency of amendment, and the frequency of frequency of amendment and control signal is overlapped.
That is, control module 40 receives the voltage of first node J1, and generated according to the voltage of first node J1
The frequency of frequency of amendment and control signal is overlapped to generate compensated control signal by frequency of amendment, control module 40,
And then the first DC-DC conversion module 10 and the 2nd DC-DC conversion module are controlled according to compensated control signal, so that
First node J1 voltage keeps balance.
In conclusion the bidirectional DC-DC converter proposed according to embodiments of the present invention, first capacitor is connected with the second capacitor
It is parallel to the both ends of DC power supply again afterwards, there is first node, the first DC-DC conversion module between first capacitor and the second capacitor
First end and second end be parallel to the both ends of first capacitor, the first end and second end of the 2nd DC-DC conversion module is parallel to
The third end at the both ends of the second capacitor, the 2nd DC-DC conversion module is connected with the third end of the first DC-DC conversion module, and second
4th end of DC-DC conversion module is connected with the 4th end of the first DC-DC conversion module, and sampling module samples the first DC-DC and becomes
Change the mold the output electric current and output voltage of any one DC-DC conversion module in block and the 2nd DC-DC conversion module, control module
Control signal is generated according to the output electric current of sampling module sampling and output voltage, and according to control signal using synchronously driven
Mode respectively controls the first DC-DC conversion module and the 2nd DC-DC conversion module, is carried out with the voltage to first node
Balance.The converter of the embodiment of the present invention can increase output power by two groups of DC-DC conversion module parallel connections as a result, and
It is capable of the voltage of active balance first node, avoids front end capacitance voltage excessive, pressure voltage needed for reducing front end capacitor, and then drop
Low production cost.
Fig. 6 is the urban transportation according to the embodiment of the present invention.As shown in fig. 6, the track of the embodiment of the present invention
Traffic power supply system 200 includes bidirectional DC-DC converter 100.
The urban transportation proposed according to embodiments of the present invention can pass through two by bidirectional DC-DC converter
Group DC-DC conversion module parallel connection increases output power, and is capable of the voltage of active balance first node, avoids front end capacitor electric
Big, pressure voltage needed for reducing front end capacitor is pressed through, and then reduces production cost.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (11)
1. a kind of control method of bidirectional DC-DC converter, which is characterized in that the bidirectional DC-DC converter includes the first electricity
Appearance, the second capacitor, the first DC-DC conversion module and the 2nd DC-DC conversion module, the first capacitor and the second capacitor string
There is between the both ends for being parallel to DC power supply, the first capacitor and second capacitor first node after connection, described the
The first end and second end of one DC-DC conversion module is connected respectively to the both ends of the first capacitor, the 2nd DC-DC transformation
The first end and second end of module is connected respectively to the both ends of second capacitor, the third of the 2nd DC-DC conversion module
End is connected with the third end of the first DC-DC conversion module, the 4th end and described first of the 2nd DC-DC conversion module
4th end of DC-DC conversion module is connected, the control method the following steps are included:
Sample any one DC-DC conversion module in the first DC-DC conversion module and the 2nd DC-DC conversion module
Export electric current and output voltage；
Control signal is generated according to the output electric current of sampling module sampling and output voltage, and is adopted according to the control signal
The first DC-DC conversion module and the 2nd DC-DC conversion module are controlled respectively with synchronously driven mode, with
The voltage of the first node is balanced.
2. the control method of bidirectional DC-DC converter as described in claim 1, which is characterized in that further include:
The voltage of the first node is fed back, and according to the voltage of the first node of feedback to the control signal
It compensates, to convert mould to the first DC-DC conversion module and the 2nd DC-DC according to compensated control signal
Block is controlled, so that the voltage of the first node keeps balance.
3. the control method of bidirectional DC-DC converter as described in claim 1, which is characterized in that output to the first DC-
DC conversion module is identical with duty ratio with the frequency of the control signal of the 2nd DC-DC conversion module.
4. the control method of bidirectional DC-DC converter as claimed in claim 2, which is characterized in that according to described the of feedback
The voltage of one node compensates the control signal, comprising:
Frequency of amendment is generated according to the voltage of the first node of feedback, and by the frequency of amendment and the control signal
Frequency is overlapped.
5. the control method of the bidirectional DC-DC converter as described in claim 1-4, which is characterized in that the first capacitor with
The specifications and models of second capacitor are identical, the hardware of the first DC-DC conversion module and the 2nd DC-DC conversion module
Parameter is identical.
6. a kind of bidirectional DC-DC converter characterized by comprising
First capacitor and the second capacitor, the first capacitor are parallel to the two of DC power supply after connecting with second capacitor again
End has first node between the first capacitor and second capacitor；
The first end and second end of first DC-DC conversion module, the first DC-DC conversion module is connected respectively to described first
The both ends of capacitor；
The first end and second end of 2nd DC-DC conversion module, the 2nd DC-DC conversion module is connected respectively to described second
The third end at the both ends of capacitor, the 2nd DC-DC conversion module is connected with the third end of the first DC-DC conversion module,
4th end of the 2nd DC-DC conversion module is connected with the 4th end of the first DC-DC conversion module；
Sampling module, the sampling module is for sampling the first DC-DC conversion module and the 2nd DC-DC conversion module
In any one DC-DC conversion module output electric current and output voltage；
Control module, the control module is for controlling the first DC-DC conversion module and the 2nd DC-DC conversion module
Carry out voltage transformation；The output electric current and output voltage that the control module is also used to be sampled according to the sampling module generate control
Signal processed, and according to the control signal using synchronously driven mode respectively to the first DC-DC conversion module and described
2nd DC-DC conversion module is controlled, and is balanced with the voltage to the first node.
7. bidirectional DC-DC converter as claimed in claim 6, which is characterized in that further include:
Mid-point voltage feedback module, the mid-point voltage feedback module are used to acquire the voltage of the first node and by described the
For the Voltage Feedback of one node to the control module, the control module is also used to the voltage according to the first node to described
Control signal compensate, so as to according to compensated control signal to the first DC-DC conversion module and the 2nd DC-
DC conversion module is controlled, so that the voltage of the first node keeps balance.
8. bidirectional DC-DC converter as claimed in claim 6, which is characterized in that output to the first DC-DC conversion module
It is identical with duty ratio with the frequency of the control signal of the 2nd DC-DC conversion module.
9. the bidirectional DC-DC converter as described in claim 6-8, which is characterized in that the first capacitor and second electricity
The specifications and models of appearance are identical, and the first DC-DC conversion module is identical as the hardware parameter of the 2nd DC-DC conversion module.
10. the bidirectional DC-DC converter as described in claim 6-8, which is characterized in that the control module believes the control
When number compensating, frequency of amendment is generated according to the voltage of the first node, and by the frequency of amendment and control letter
Number frequency be overlapped.
11. a kind of the urban transportation, which is characterized in that including two-way as described in any one of claim 6-10
DC-DC converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205943.6A CN110277917B (en) | 2018-03-13 | 2018-03-13 | Rail transit power supply system, bidirectional DC-DC converter thereof and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205943.6A CN110277917B (en) | 2018-03-13 | 2018-03-13 | Rail transit power supply system, bidirectional DC-DC converter thereof and control method |
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| CN110277917B CN110277917B (en) | 2021-06-18 |
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| CN110277917B (en) | 2021-06-18 |
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