CN110277916A - 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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- CN110277916A CN110277916A CN201810204831.9A CN201810204831A CN110277916A CN 110277916 A CN110277916 A CN 110277916A CN 201810204831 A CN201810204831 A CN 201810204831A CN 110277916 A CN110277916 A CN 110277916A
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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
Abstract
The invention discloses a kind of the urban transportation and its bidirectional DC-DC converter and control method, converter includes: to be parallel to the both ends of DC power supply after first capacitor is connected with the second capacitor again and have first node；The first end and second end of first DC-DC conversion module is in parallel with first capacitor；The first end and second end of 2nd DC-DC conversion module is in parallel with the second capacitor, the third end and the 4th end of 2nd DC-DC conversion module are connected with the third end of the first DC-DC conversion module and the 4th end, assist DC-DC uptake pathway to a progress charge and discharge in first capacitor and the second capacitor, sampling module samples the output electric current and output voltage of any one conversion module；Control module generates control signal according to output electric current and output voltage, and conversion module is controlled using synchronously driven mode according to control signal, it is balanced with the voltage to first node, so as to increase the stabilization that the voltage of output power and balance first node guarantees front end capacitance voltage by way of in parallel.
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 bidirectional DC-DC converter, by two groups of DC-DC conversion module parallel connections increase output powers, and
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 the urban transportation.
Yet another object of the invention is that proposing a kind of control method of bidirectional DC-DC converter.
In order to achieve the above objectives, a kind of bidirectional DC-DC converter that one aspect of the present invention embodiment proposes, comprising: first
Capacitor and the second capacitor, the first capacitor connect with second capacitor after at the both ends for being parallel to DC power supply, described
There is first node between one capacitor and second capacitor；First DC-DC conversion module, the first DC-DC conversion module
First end and second end be connected respectively to the both ends of the first capacitor；2nd DC-DC conversion module, the 2nd DC-DC
The first end and second end of conversion module is connected respectively to the both ends of second capacitor, the 2nd DC-DC conversion module
Third end is connected with the third end of the first DC-DC conversion module, the 4th end of the 2nd DC-DC conversion module with it is described
4th end of the first DC-DC conversion module is connected；Assist DC-DC uptake pathway, the auxiliary DC-DC uptake pathway and described the
One in one capacitor and second capacitor is connected in parallel, and the auxiliary DC-DC uptake pathway passes through to the first capacitor
A progress charge and discharge in second capacitor, are balanced with the voltage to the first node；Sampling module, it is described
Sampling module becomes for sampling any one DC-DC in the first DC-DC conversion module and the 2nd DC-DC conversion module
Change the mold the output electric current and output voltage of block；Control module, the control module are defeated for being sampled according to the sampling module
Electric current and output voltage generate control signal out, and use synchronously driven mode respectively to described the according to the control signal
One DC-DC conversion module and the 2nd DC-DC conversion module are controlled, so that the voltage of the first node keeps flat
Weighing apparatus.
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, assists DC-DC uptake pathway and first
One in capacitor and the second capacitor is connected in parallel, and auxiliary DC-DC uptake pathway passes through in first capacitor and the second capacitor
One progress charge and discharge, is balanced with the voltage to first node, and sampling module acquires the first DC-DC conversion module and second
The output electric current and output voltage of any one DC-DC conversion module in DC-DC conversion module, control module is according to sampling module
The output electric current and output voltage of sampling generate control signal, and according to control signal using synchronously driven mode respectively to the
One DC-DC conversion module and the 2nd DC-DC transformation are controlled, so that the voltage of first node keeps balance.It is of the invention as a result,
The converter of embodiment can increase output power by two groups of DC-DC conversion module parallel connections, and being capable of active balance first
The voltage of node 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 auxiliary DC-DC uptake pathway includes auxiliary DC-DC module and energy storage electricity
Pond, the first end and second end of the auxiliary DC-DC module are connected to one in the first capacitor and second capacitor
On, the third end and the 4th end of the auxiliary DC-DC module are connected to the both ends of the energy-storage battery.
According to one embodiment of present invention, when the voltage of the first node is greater than the output voltage of the DC power supply
Half when, discharge with auxiliary DC-DC module capacitor in parallel by the auxiliary DC-DC module, described in giving
Energy-storage battery charging；When the voltage of the first node is less than the half of the output voltage of the DC power supply, the energy storage
Battery is discharged by the auxiliary DC-DC module, to give the capacitor charging of the auxiliary DC-DC module parallel connection.
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, 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.
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.
In order to achieve the above objectives, a kind of controlling party for bidirectional DC-DC converter that another aspect of the invention embodiment proposes
Method, the bidirectional DC-DC converter include first capacitor, the second capacitor, the first DC-DC conversion module, the 2nd DC-DC transformation mould
Block and auxiliary DC-DC uptake pathway, the first capacitor connect with second capacitor after at the both ends for being parallel to DC power supply,
There is first node, the first end of the first DC-DC conversion module and the between the first capacitor and second capacitor
Two ends are connected respectively to the both ends of the first capacitor, and the first end and second end of the 2nd DC-DC conversion module connects respectively
It is connected to the both ends of second capacitor, third end and the first DC-DC conversion module of the 2nd DC-DC conversion module
Third end is connected, and the 4th end of the 2nd DC-DC conversion module is connected with the 4th end of the first DC-DC conversion module,
The auxiliary DC-DC uptake pathway is connected in parallel with one in the first capacitor and second capacitor, the auxiliary DC-
DC uptake pathway is by a progress charge and discharge in the first capacitor and second capacitor, to the first node
Voltage be balanced, the control method is the following steps are included: sampling the first DC-DC conversion module and described second
The output electric current and output voltage of any one DC-DC conversion module in DC-DC conversion module；It is sampled according to the sampling module
Output electric current and output voltage generate control signal, and according to the control signal use synchronously driven mode respectively 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.
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, according to sampling mould
The output electric current and output voltage of block sampling generate control signal, and right respectively using synchronously driven mode according to control signal
First DC-DC conversion module and the 2nd DC-DC conversion module are controlled, so that the voltage of first node keeps balance.As a result,
The control method of the embodiment of the present invention can increase output power by two groups of DC-DC conversion module parallel connections, and can be effective
The voltage for balancing first node, avoids front end capacitance voltage excessive, pressure voltage needed for reducing front end capacitor, and then reduces and be produced into
This.
According to one embodiment of present invention, the auxiliary DC-DC uptake pathway includes auxiliary DC-DC module and energy storage electricity
Pond, the first end and second end of the auxiliary DC-DC module are parallel to one in the first capacitor and second capacitor
On, the third end and the 4th end of the auxiliary DC-DC module are connected to the both ends of the energy-storage battery, wherein when described first
When the voltage of node is greater than the half of the output voltage of the DC power supply, the capacitor in parallel with the auxiliary DC-DC module is logical
It crosses the auxiliary DC-DC module to discharge, to charge to the energy-storage battery；Described in being less than when the voltage of the first node
When the half of the output voltage of DC power supply, the energy-storage battery is discharged by the auxiliary DC-DC module, described auxiliary to give
Help the capacitor charging of DC-DC module parallel connection.
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, 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.
Detailed description of the invention
Fig. 1 is the block diagram according to 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 urban transportation of the embodiment of the present invention；
Fig. 4 is the flow chart according to the control method of the bidirectional DC-DC converter 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 block diagram according to the bidirectional DC-DC converter of the embodiment of the present invention.As illustrated in fig. 1 and 2, 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, control module 40 and auxiliary DC-DC uptake pathway 50.
Wherein, first capacitor C1 is parallel to the both ends of DC power supply DC, first capacitor C1 again after connecting with the second capacitor C2
There is first node J1 between the second capacitor C2；The first end 11 and second end 12 of first DC-DC conversion module 10 connect respectively
It is connected to the both ends of first capacitor C1；The first end 21 and second end 22 of 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 10；DC-DC is assisted to inhale
One received in network 50 and first capacitor C1 and the second capacitor C2 is connected in parallel, and DC-DC uptake pathway 50 is assisted to pass through to the
A progress charge and discharge in one capacitor C1 and the second capacitor C2, are balanced with the voltage to first node J1；Sampling module
30 for sampling the defeated of any one DC-DC conversion module in the first DC-DC conversion module 10 and the 2nd DC-DC conversion module 20
Electric current and output voltage out；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 the first DC-DC conversion module 10 and the 2nd DC-DC are converted respectively using synchronously driven mode according to control signal
Module 20 is controlled, so that the voltage of first node J1 keeps balance.
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.
Should be noted is influenced due to electrical components by actual processing procedure and material, will lead to component ginseng
Number has deviation, and then leads to the Voltage unbalance of first node J1.Based on this, in order to solve the electricity as caused by component parameter
Pressure is uneven, increases an auxiliary DC-DC uptake pathway, so that the voltage of first node J1 keeps balance.
Wherein, auxiliary DC-DC uptake pathway 50 can be in parallel with one in first capacitor C1 and the second capacitor C2, such as Fig. 1
Shown, auxiliary DC-DC uptake pathway 50 is in parallel with the second capacitor C2, and auxiliary DC-DC uptake pathway 50 passes through to first capacitor C1
A progress charge and discharge in the second capacitor C2, are balanced with the voltage to first node J1.
Specifically, as shown in Fig. 2, auxiliary DC-DC uptake pathway 50 includes assisting DC-DC module 51 and energy-storage battery 52,
The first end and second end of auxiliary DC-DC module 51 is parallel on one in first capacitor C1 and the second capacitor C2, assists DC-
The third end and the 4th end of DC module 51 are connected to the both ends of energy-storage battery 52.
According to one embodiment of present invention, when the one of output voltage of the voltage of first node J1 greater than DC power supply DC
When half, the capacitor in parallel with auxiliary DC-DC module 51 is by assisting DC-DC module 51 to discharge, to fill to energy-storage battery 52
Electricity；When the half of output voltage of the voltage of first node J1 less than DC power supply DC, energy-storage battery 52 passes through auxiliary DC-DC
Module 51 is discharged, to give the capacitor charging in parallel of auxiliary DC-DC module 51.Wherein, energy-storage battery 52 can be track battery.
That is, for assisting DC-DC uptake pathway 50 in parallel with the second capacitor C2, when the voltage of first node J1
When the half of the output voltage greater than DC power supply DC, the second capacitor C2 can be by assisting DC-DC module 51 to discharge, to give
Energy-storage battery 52 charges；Conversely, when the half of output voltage of the voltage of first node J1 less than DC power supply DC, energy storage electricity
Pond 52 can be discharged by auxiliary DC-DC module 51, to charge to the second capacitor C2, to pass through auxiliary DC-DC uptake pathway energy
Enough make the first node J1 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, while carrying out charge and discharge by auxiliary DC-DC uptake pathway, can make first
The balance of voltage of node, the i.e. voltage of guarantee first capacitor and the second capacitor are maintained at the half of direct current power source voltage, from
And make the half of the pressure voltage direct current power source voltage of first capacitor and the second capacitor, so that first capacitor and the second capacitor can be pressed
Type selecting is carried out according to the half of DC power supply, production cost is effectively reduced.
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 afterwards, there is first node between first capacitor and the second capacitor, the first DC-DC conversion module
First segment and second end are connected respectively to the both ends of first capacitor, first segment and the second end difference of the 2nd DC-DC conversion module
It is connected to the both ends of the second capacitor, the third end of the 2nd DC-DC conversion module and the third end phase of the first DC-DC conversion module
Even, the 4th end of the 2nd DC-DC conversion module is connected with the 4th end of the first DC-DC conversion module, assists DC-DC uptake pathway
It is connected in parallel with one in first capacitor and the second capacitor, auxiliary DC-DC uptake pathway passes through to first capacitor and the second electricity
A progress charge and discharge in appearance, are balanced with the voltage to first node, and sampling module acquires the first DC-DC conversion module
With the output electric current and output voltage of any one DC-DC conversion module in the 2nd DC-DC conversion module, control module is according to adopting
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 transformation are controlled, so that the voltage of first node keeps balance.As a result,
The converter of the embodiment of the present invention can increase output power by two groups of DC-DC conversion module parallel connections, and can effectively put down
The voltage of weighing apparatus first node, avoids front end capacitance voltage excessive, pressure voltage needed for reducing front end capacitor, and then reduces and be produced into
This.
Fig. 3 is the urban transportation according to the embodiment of the present invention.As shown in figure 3, the track of the embodiment of the present invention
Traffic power supply system 200 includes bidirectional DC-DC converter 200.
The urban transportation proposed according to embodiments of the present invention can effectively be put down by bidirectional DC-DC converter
The voltage of weighing apparatus first node, avoids front end capacitance voltage excessive, pressure voltage needed for reducing front end capacitor, and then reduces and be produced into
This.
Fig. 4 is the control method according to the bidirectional DC-DC converter of the embodiment of the present invention.Wherein, bidirectional DC-DC converter
Including first capacitor, the second capacitor, the first DC-DC conversion module, the 2nd DC-DC conversion module and DC-DC uptake pathway is assisted,
First capacitor has first after connecting with the second capacitor between the both ends for being parallel to DC power supply, first capacitor and the second capacitor
Node, the first end and second end of the first DC-DC conversion module are parallel to the both ends of first capacitor, the 2nd DC-DC conversion module
First end and second end be parallel to the both ends of the second capacitor, the third end of the 2nd DC-DC conversion module and the first DC-DC are converted
The third end of module is connected, and the 4th end of the 2nd DC-DC conversion module is connected with the 4th end of the first DC-DC conversion module, auxiliary
DC-DC uptake pathway is helped to be connected in parallel with one in first capacitor and the second capacitor, auxiliary DC-DC uptake pathway passes through to the
A progress charge and discharge in one capacitor and the second capacitor, are balanced with the voltage to first node.Wherein, of the invention real
Applying bidirectional DC-DC converter in example is 1500V bidirectional DC-DC converter.Wherein, the first DC-DC conversion module and the 2nd DC-DC
Conversion module is two-way H bridge DC chopper circuit.
As shown in figure 4, the control method of the bidirectional DC-DC converter of the embodiment of the present invention the following steps are included:
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, so that first segment
The voltage of point 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.
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 become to the first DC-DC conversion module and the 2nd DC-DC
Mold changing block, which synchronizes, to be driven so that the voltage of first node keeps balance.
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.
Should be noted is influenced due to electrical components by actual processing procedure and material, will lead to component ginseng
Number has deviation, and then leads to the Voltage unbalance of first node.Based on this, in order to solve the voltage as caused by component parameter
Imbalance can increase an auxiliary DC-DC uptake pathway, so that the voltage of first node keeps balance.
According to one embodiment of present invention, auxiliary DC-DC uptake pathway includes assisting DC-DC module and energy-storage battery,
The first end and second end of auxiliary DC-DC module is parallel on one in first capacitor and the second capacitor, assists DC-DC module
Third end and the 4th end be connected to the both ends of energy-storage battery, wherein when the voltage of first node is greater than the output of DC power supply
When the half of voltage, the capacitor in parallel with auxiliary DC-DC module is by assisting DC-DC module to discharge, to give energy-storage battery
Charging；When the voltage of first node is less than the half of the output voltage of DC power supply, energy-storage battery passes through auxiliary DC-DC module
Electric discharge, to give the capacitor charging of auxiliary DC-DC module parallel connection.
That is, for assisting DC-DC uptake pathway in parallel with the second capacitor C2, when the voltage of first node is greater than
When the half of the output voltage of DC power supply, the second capacitor can be by assisting DC-DC module to discharge, to fill to energy-storage battery
Electricity；Conversely, energy-storage battery can pass through auxiliary when the half of output voltage of the voltage of first node less than DC power supply DC
DC-DC module electric discharge, to give the second capacitor charging, thus by assisting DC-DC uptake pathway that first node voltage can be made flat
Weighing apparatus.
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, while carrying out charge and discharge by auxiliary DC-DC uptake pathway, can make first node
The balance of voltage, i.e. guarantee first capacitor and the voltage of the second capacitor is maintained at the half of direct current power source voltage, to make
The pressure voltage of first capacitor and the second capacitor is the half of direct current power source voltage, so that first capacitor and the second capacitor can be according to straight
The half in galvanic electricity source carries out type selecting, and production cost is effectively reduced.
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,
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, so that the voltage of first node is kept
Balance.The control method of the embodiment of the present invention as a result, can increase output power by two groups of DC-DC conversion module parallel connections, and
And it is capable of the voltage of active balance first node, and avoid front end capacitance voltage excessive, pressure voltage needed for reducing front end capacitor, in turn
Reduce 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 (10)
1. 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；
Assist DC-DC uptake pathway, the auxiliary DC-DC uptake pathway and one in the first capacitor and second capacitor
A to be connected in parallel, the auxiliary DC-DC uptake pathway passes through to a progress in the first capacitor and second capacitor
Charge and discharge are balanced with the voltage to the first node；
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 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 described the
Two DC-DC conversion modules are controlled, so that the voltage of the first node keeps balance.
2. bidirectional DC-DC converter as described in claim 1, which is characterized in that the auxiliary DC-DC uptake pathway includes auxiliary
DC-DC module and energy-storage battery are helped, the first end and second end of the auxiliary DC-DC module is parallel to the first capacitor and institute
It states on one in the second capacitor, the third end and the 4th end of the auxiliary DC-DC module are connected to the two of the energy-storage battery
End.
3. bidirectional DC-DC converter as claimed in claim 2, which is characterized in that wherein,
When the voltage of the first node is greater than the half of the output voltage of the DC power supply, with the auxiliary DC-DC mould
The capacitor of block parallel connection is discharged by the auxiliary DC-DC module, to charge to the energy-storage battery；
When the voltage of the first node is less than the half of the output voltage of the DC power supply, the energy-storage battery passes through institute
Auxiliary DC-DC module electric discharge is stated, to give the capacitor charging of the auxiliary DC-DC module parallel connection.
4. bidirectional DC-DC converter as claimed in any one of claims 1-3, which is characterized in that the first capacitor and institute
The specifications and models for stating the second capacitor are identical, and the hardware of the first DC-DC conversion module and the 2nd DC-DC conversion module is joined
Number is identical.
5. bidirectional DC-DC converter as described in claim 1, 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.
6. a kind of the urban transportation, which is characterized in that including two-way DC- according to any one of claims 1 to 5
DC converter.
7. 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, the 2nd DC-DC conversion module and auxiliary DC-DC uptake pathway, first electricity
Appearance has between the both ends for being parallel to DC power supply, the first capacitor and second capacitor after connecting with second capacitor
There is first node, the first end and second end of the first DC-DC conversion module is connected respectively to the both ends of the first capacitor,
The first end and second end of the 2nd DC-DC conversion module is connected respectively to the both ends of second capacitor, the 2nd DC-
The third end of DC conversion module is connected with the third end of the first DC-DC conversion module, the 2nd DC-DC conversion module
4th end is connected with the 4th end of the first DC-DC conversion module, the auxiliary DC-DC uptake pathway and the first capacitor
It is connected in parallel with one in second capacitor, the auxiliary DC-DC uptake pathway passes through to the first capacitor and described
A progress charge and discharge in second capacitor, are balanced with the voltage to the first node, the control method include with
Lower step:
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 set to keep balance.
8. the control method of bidirectional DC-DC converter as claimed in claim 7, which is characterized in that the auxiliary DC-DC absorbs
Network includes auxiliary DC-DC module and energy-storage battery, and the first end and second end of the auxiliary DC-DC module is parallel to described the
On one in one capacitor and second capacitor, the third end and the 4th end of the auxiliary DC-DC module are connected to the storage
The both ends of energy battery, wherein
When the voltage of the first node is greater than the half of the output voltage of the DC power supply, with the auxiliary DC-DC mould
The capacitor of block parallel connection is discharged by the auxiliary DC-DC module, to charge to the energy-storage battery；
When the voltage of the first node is less than the half of the output voltage of the DC power supply, the energy-storage battery passes through institute
Auxiliary DC-DC module electric discharge is stated, to give the capacitor charging of the auxiliary DC-DC module parallel connection.
9. the control method of bidirectional DC-DC converter as claimed in claim 7 or 8, 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.
10. the control method of bidirectional DC-DC converter as claimed in claim 7 or 8, which is characterized in that output to described the
One DC-DC conversion module is identical with duty ratio with the frequency of the control signal of the 2nd DC-DC conversion module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810204831.9A CN110277916A (en) | 2018-03-13 | 2018-03-13 | The urban transportation and its bidirectional DC-DC converter and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810204831.9A CN110277916A (en) | 2018-03-13 | 2018-03-13 | The urban transportation and its bidirectional DC-DC converter and control method |
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Application publication date: 20190924 |