CN105281574A - LC parallel bidirectional resonance DC/DC converter and control method thereof - Google Patents
LC parallel bidirectional resonance DC/DC converter and control method thereof Download PDFInfo
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- CN105281574A CN105281574A CN201410279733.3A CN201410279733A CN105281574A CN 105281574 A CN105281574 A CN 105281574A CN 201410279733 A CN201410279733 A CN 201410279733A CN 105281574 A CN105281574 A CN 105281574A
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Abstract
The invention relates to an LC parallel bidirectional resonance DC/DC converter and a control method thereof. The converter is suitable for occasions of high voltage and large power. The converter comprises a converter module 1, a resonance unit and a converter module 2 in successive connection; each converter module comprises a DC power supply, a filtering capacitor and a converter bridge arm in parallel connection; the bridge arm comprises two branches in parallel connection, and each branch is composed of two switch tubes in serial connection; and the resonance unit is connected to position between the two switch tubes of each branch. In the control method, ON/OFF of the switch tubes are controlled to realize eight step-up/down modes. According to the converter and control method thereof, power can flow bi-directionally, and different step-up/down requirements can be met.
Description
Technical field:
The present invention relates to a kind of two-way resonance DC/DC converter and control method thereof, more specifically relate to a kind of the LC two-way resonance DC/DC converter in parallel and the control method thereof that are applicable to high-power.
Background technology:
Along with the high speed development with information technology that increases rapidly of city size, sensitive load in electrical network, important load and nonlinear-load are more and more, AC distribution net will face that line loss is large, power supply corridor is nervous, and a series of power quality problem such as voltage sag, voltage fluctuation, mains by harmonics, the aggravation of three-phase imbalance phenomenon, in the urgent need to changing existing distribution net work structure and joining (confession) electric mode.
Power distribution network based on direct current has than the better performance of interchange in transmission capacity, controllability and raising power supply quality etc., effectively can improve the quality of power supply, reduce the use of power electronics converter, reduce electric energy loss and operating cost, contradiction between coordination bulk power grid and distributed power source, give full play to value and the benefit of distributed energy.
Loss is an important Consideration in high power transmission, soft switch technique can reduce the loss of switching device to a great extent, improve power transmission efficiency, effectively can also prevent switching device from damaging owing to generating heat too much, now propose one and be applicable to powerful LC two-way resonance DC/DC converter in parallel and control method thereof.
Summary of the invention:
The object of this invention is to provide a kind of LC two-way resonance DC/DC converter in parallel and control method thereof, present invention achieves the buck of high power converter in DC distribution net.
For achieving the above object, the present invention by the following technical solutions: a kind of LC two-way resonance DC/DC in parallel converter, described converter is applicable to high-power occasion; Described converter comprises converter module 1, resonant element and the converter module 2 connected successively; Described variator module 1 comprises DC power supply in parallel, filter capacitor and converter brachium pontis respectively with described converter module 2; Described brachium pontis comprises two in parallel branch roads be composed in series by two switching tubes; Described resonant element connects between two switching tubes in each described branch road respectively.
A kind of LC provided by the invention two-way resonance DC/DC in parallel converter, the diode of the equal reverse parallel connection of each described switching tube; Branch road in described variator module 1 comprises the upper pipe Q2 of series connection and the upper pipe Q1 of lower pipe Q4 and series connection and lower pipe Q3; Branch road in described variator module 2 comprises Q6 and Q8 of series connection and Q5 and Q7 of series connection.
A kind of LC provided by the invention two-way resonance DC/DC in parallel converter, described resonant element comprises inductance L r in parallel and electric capacity Cr; The first end of described resonant element is respectively between connecting valve pipe Q1 and Q3 and between switching tube Q6 and Q8; Second end of described resonant element is respectively between connecting valve pipe Q2 and Q4 and between switching tube Q5 and Q7.
Another preferred a kind of LC provided by the invention two-way resonance DC/DC in parallel converter, the converter brachium pontis in described variator module 2 and tandem tap pipe Q9 between its filter capacitor, described switching tube Q9 anti-parallel diodes D9.
The invention provides comprise technique scheme the control method of a kind of LC two-way resonance DC/DC in parallel converter, described method comprises eight stages; In the first phase during step-down work, described switching tube Q1 and switching tube Q4 conducting, the voltage VCr of described electric capacity Cr is the voltage V1 of the DC power supply of negative described converter module 1;
Described inductance L r electric current is linearly reduced to zero and then be oppositely increased to I1 until it is the process inputing to inductance makeup energy that I1 is greater than I0 by positive I0, and its output current is provided by filter capacitor C2;
During boosting work, described switching tube Q5 and switching tube Q8 conducting, the voltage VCr of the electric capacity in described resonant element is the voltage V2 of the DC power supply of described converter module 2, and the voltage on described inductance L r equals input voltage, and described inductive current linearly increases; This stage is the process inputing to inductance makeup energy, and inductive current is linearly increased to I1 from I0, and output current is provided by filter capacitor.
Another preferred described method provided by the invention, in second stage during step-down work, described switching tube Q1 and switching tube Q4 turns off simultaneously, and parallel resonance occurs described inductance L r and electric capacity Cr until described switching tube Q9 conducting, and the voltage VCr of described electric capacity Cr equals described voltage V2; In this stage, input and the output of described converter do not have Energy Transfer, and output current is still provided by filter capacitor C2; The energy of converter transmits between described inductance L r and electric capacity Cr, but gross energy on inductance L r and electric capacity Cr is constant;
During boosting work, described switching tube Q5 and switching tube Q8 turns off simultaneously, and described inductance L r and electric capacity Cr parallel resonance occurs until described voltage VCr is negative described voltage V1; The input of described converter and output do not have Energy Transfer in this stage, and output current is still provided by filter capacitor C1, and energy transmits between described inductance L r and electric capacity Cr, and the gross energy of described inductance and electric capacity is constant.
Another preferred described method provided by the invention, in the phase III during step-down work, the anti-also diode D8 conducting of the anti-also diode D5 and switching tube Q8 of described switching tube Q5, electric current in described inductance L r flows through the anti-of switching tube Q5 and the anti-also diode D8 of diode D5 and switching tube Q8 is that filter capacitor C2 charges, and provides load current; In this stage, the voltage of described electric capacity Cr remains unchanged, described inductance L r power on cleanliness reduce; The energy of converter input be exactly this stage pass to load until described switching tube Q9 turns off terminates;
During boosting work, the anti-also diode D4 conducting of the anti-also diode D1 and switching tube Q4 of described switching tube Q1, electric current in described inductance L r flows through anti-also diode D1, described anti-also diode D4 charges to filter capacitor C1, and load current is provided, within this stage, described electric capacity VCr remains unchanged, the cleanliness that powers on described inductance L r reduces, and the energy of described converter input passes to load until described inductance L r electric current is zero end within this stage.
Another preferred described method provided by the invention, in fourth stage during step-down work, the current i Lr of described resonant inductance Lr is I3, the voltage VCr of described electric capacity Cr is described output voltage V2, the anti-also diode D8 of the anti-also diode D5 and described switching tube Q8 of described switching tube Q5 turns off, and described inductance L r and electric capacity Cr parallel resonance occurs until described voltage VCr equals described voltage V1; In this stage, energy and constant on described inductance L r and electric capacity Cr;
During boosting work, the current i Lr=I3=0 of described resonant inductance Lr, described anti-also diode D1, anti-and diode D4 turns off, there is parallel resonance until described voltage Cr is negative described V2 in described inductance L r and electric capacity Cr, in this stage, the gross energy on described inductance L r and electric capacity Cr is constant.
Another preferred described method provided by the invention, in five-stage during step-down work, described switching tube Q2 and switching tube Q3 conducting, described voltage VCr is described voltage V1, voltage on described inductance L r equals input voltage V1, and described inductance L r electric current is linearly reduced to zero and then be oppositely increased to I5 until I5 is greater than I4 by the I4 born;
This stage is the process that described converter inputs to inductance makeup energy, and described inductance L r electric current is linearly reduced to zero and is then oppositely increased to I5 from reverse I4, and the output current of described converter is provided by filter capacitor C2;
During boosting work, described switching tube Q6 and switching tube Q7 conducting, described voltage Cr is negative described voltage V2, voltage on described inductance L r equals negative input voltage, described inductance L r electric current linearly oppositely increases, this stage is the process inputing to inductance makeup energy, and described inductance L r electric current reverse linear from I4 is increased to I5, and output current is provided by filter capacitor C1.
Another a kind of preferred described method provided by the invention, in the 6th stage during step-down work, described switching tube Q2 and described switching tube Q3 turns off simultaneously, and parallel resonance occurs described inductance L r and electric capacity Cr until described switching tube Q9 conducting, and described voltage VCr is negative described voltage V2; In this stage, the input of described converter and output do not have energy to pass, and output current is still provided by filter capacitor C2; The energy of described converter transmits between inductance and electric capacity, and the gross energy on described inductance L r and electric capacity Cr is constant;
During boosting work, described switching tube Q6 and the 7th switching tube Q7 turns off simultaneously, parallel resonance occurs described inductance L r and electric capacity Cr until described voltage VCr is described voltage V1, input and output do not have Energy Transfer in this stage, output current is still provided by filter capacitor C1, energy transmits between inductance L r and electric capacity Cr, and the gross energy on described inductance and electric capacity is constant.
Another a kind of preferred described method provided by the invention, in the 7th stage during step-down work, described voltage VCr equals negative described voltage V2, the anti-also diode seven D7 conducting of anti-also diode six D6 and switching tube Q7 of described switching tube Q6, electric current in described inductance L r flows through the anti-of switching tube Q6 and the anti-also diode D7 of diode D6 and switching tube Q7 is that described filter capacitor C2 charges, and provides load current; In this stage, described voltage VCr remains unchanged, described inductance L r power on cleanliness reduce; The energy of the input of described converter be exactly this stage pass to inside load until described switching tube turns off just terminate this stage;
During boosting work, described voltage VCr equals described voltage V1, the anti-also diode D3 conducting of the anti-also diode D2 and switching tube Q3 of described switching tube Q2, electric current in described inductance L r flows through anti-also diode D2, and described anti-also diode D3 charges to filter capacitor C1, and provides load current, within this stage, described voltage VCr remains unchanged, described inductance L r power on cleanliness reduce, the energy of the input of described converter passes to load until described inductive current is zero end in this stage.
Another a kind of preferred described method provided by the invention, in the 8th stage during step-down work, the current i Lr of described resonant inductance Lr equals I7, described voltage VCr is negative described voltage V2, the anti-also diode D7 of the anti-also diode D6 and switching tube Q7 of described switching tube Q6 turns off, and described inductance L r and electric capacity Cr parallel resonance occurs until described voltage VCr is negative described voltage V1; In this stage, energy and constant on described inductance L r and electric capacity Cr;
During boosting work, the current i Lr=I7=0 of described resonant inductance Lr, described voltage VCr is described voltage V1, described anti-also diode D2 and anti-also diode D3 turns off, there is parallel resonance until described voltage VCr equals described voltage V2 in described inductance L r and electric capacity Cr, in this stage, the gross energy on described inductance and electric capacity is constant.
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
1, the present invention possesses to and fro flow of power ability, can realize the different demands of boosting and step-down;
2, all switching tubes of the present invention can realize Sofe Switch, and diode is all zero-current switching, and loss is little, and efficiency is very high, are applicable to high power transmission;
3, switching frequency excursion of the present invention is less, is easy to optimal design magnetic element;
4, the present invention's components and parts used are less, and the diode-built-in making full use of switching tube uses as rectifier diode.
Accompanying drawing explanation
Fig. 1 is LC two-way resonance DC/DC conversion device topological structure schematic diagram of the present invention;
Fig. 2 is that converter of the present invention is correlated with when working in decompression mode element manipulation oscillogram;
Fig. 3 is converter of the present invention first stage operation mode figure when working in decompression mode;
Fig. 4 is converter of the present invention second, four, six, eight stage operation mode figure when working in decompression mode;
Fig. 5 is converter of the present invention phase III operation mode figure when working in decompression mode;
Fig. 6 is converter of the present invention five-stage operation mode figure when working in decompression mode;
Fig. 7 is converter of the present invention 7th stage operation mode figure when working in decompression mode;
Fig. 8 is that converter of the present invention is correlated with when working in boost mode element manipulation oscillogram;
Fig. 9 is converter of the present invention first stage operation mode figure when working in boost mode;
Figure 10 is converter of the present invention second, four, six, eight stage operation mode figure when working in boost mode;
Figure 11 is converter of the present invention phase III operation mode figure when working in boost mode;
Figure 12 is converter of the present invention five-stage operation mode figure when working in boost mode;
Figure 13 is converter of the present invention 7th stage operation mode figure when working in boost mode.
Embodiment
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in figures 1-13, the invention LC two-way resonance DC/DC in parallel converter of this example, described converter is applicable to high-power occasion; Described converter comprises converter module 1, resonant element and the converter module 2 connected successively; Described variator module 1 comprises DC power supply in parallel, filter capacitor and converter brachium pontis respectively with described converter module 2; Described converter brachium pontis is made up of the switching tube Q1 ~ Q9 of the first to the 9th band backward diode; Described brachium pontis comprises two in parallel branch roads be composed in series by two switching tubes; Described resonant element connects between two switching tubes in each described branch road respectively.LC parallel resonance two-way DC-DC converter of the present invention connects direct-current input power supplying and load, and resonant element connects brachium pontis that first to fourth switching tube forms and the brachium pontis that the 5th to the 8th switching tube is formed.Resonant element is composed in parallel by an an inductance L r and electric capacity Cr.First switching tube Q1 is connected direct-current input power supplying with the series arm of the 3rd switching tube Q3 afterwards with the series arm of described second switch pipe Q2 and the 4th switching tube Q4 is parallel with one another.5th switching tube Q5 is connected the 9th switching tube Q9 and output filter capacitor with the series arm of the 7th switching tube Q7 afterwards with the series arm of described 6th switching tube Q6 and the 8th switching tube Q8 is parallel with one another.The first end of resonant element is connected in the end that connects held and be connected in the 6th switching tube Q6 and the 8th switching tube Q8 simultaneously that connects of the first switching tube Q1 and the 3rd switching tube Q3; Second end of resonant element is connected in the end that connects held and be connected in described 5th switching tube Q5 and the 7th switching tube Q7 simultaneously that connects of second switch pipe Q2 and the 4th switching tube Q4.9th switching tube Q9 mono-end is connected on the end that connects of the 5th switching tube Q5 and the 6th switching tube Q6, and the other end of the 9th switching tube Q9 is connected on one end of described filter capacitor two C2.The first end of filter capacitor two C2 is connected on one end of described 9th switching tube Q9, and described filter capacitor C2 second end is connected on described 7th switching tube Q7 and the 8th switching tube Q8 and connects end.
Below LC parallel resonance two-way DC-DC converter control method of the present invention is described in detail.
When it works in decompression mode:
As shown in Figures 2 and 3, the first stage:
In the t0 moment, first switching tube Q1 and the 4th switching tube Q4 conducting, vCr=-V1, vCr represents the voltage of the electric capacity in resonant element, V1 represents the voltage of input DC power, due to the first switching tube Q1 during conducting and the 4th switching tube Q4 not having voltage, so achieve the no-voltage conducting of the first switching tube Q1 and the 4th switching tube Q4.Input current circuit is by direct-current input power supplying, first switching tube Q1, inductance L r, 4th switching tube Q4 is formed, and the voltage on inductance L r equals negative input voltage, and inductive current is linearly reduced to zero and then be oppositely increased to I1 by positive I0, final I1 is greater than I0, this stage is the process inputing to inductance makeup energy, and inductive current is linearly reduced to zero and is then oppositely increased to I1 from forward I0, and output current is provided by filter capacitor C2.
As shown in Figure 2 and Figure 4, second stage:
In the t1 moment, first switching tube Q1 and the 4th switching tube Q4 turns off simultaneously, after this there is parallel resonance in inductance L r and electric capacity Cr, until the 9th switching tube Q9 conducting, now vCr=V2, wherein V2 represents output voltage, and input and output do not have Energy Transfer in this process, and output current is still provided by filter capacitor C2.Energy transmits between inductance L r and electric capacity Cr, but the gross energy on inductance L r and electric capacity Cr is constant.
As shown in Figure 2 and Figure 5, the phase III:
In the t2 moment, vCr=V2, after this anti-also diode D8 conducting of the anti-also diode D5 and the 8th switching tube Q8 of the 5th switching tube Q5, electric current in inductance flows through the anti-of the 5th switching tube Q5 and the anti-also diode D8 of diode D5 and the 8th switching tube Q8 charges to filter capacitor C2, and provides load current.During this period of time, vCr remains unchanged, inductance L r power on cleanliness reduce.The energy of input is exactly pass to load during this period, and this process is until the 9th switching tube Q9 shutoff just terminates.
As shown in Figure 2 and Figure 4, fourth stage:
In the t3 moment, iLr=I3, vCr=V2, wherein iLr represents the electric current of resonant inductance Lr, and I3 represents the electric current of resonant inductance Lr in the t3 moment, and after this anti-also diode D8 of the anti-also diode D5 and the 8th switching tube Q8 of the 5th switching tube Q5 turns off, after this there is parallel resonance in inductance L r and electric capacity Cr, until vCr=V1, during this period of time, energy and be constant on inductance L r and electric capacity Cr.
As shown in Figure 2 and Figure 6, five-stage:
Carve at t4, second switch pipe Q2 and the 3rd switching tube Q3 conducting, vCr=V1, vCr represents the voltage of the electric capacity Cr in resonant element, V1 represents the voltage of input DC power, due to second switch pipe Q2 during conducting and the 3rd switching tube Q3 not having voltage, so achieve the no-voltage conducting of second switch pipe Q2 and the 3rd switching tube Q3.Input current circuit is by direct-current input power supplying, second switch pipe Q2, inductance, 3rd switching tube Q3 is formed, and the voltage on inductance L r equals input voltage, and inductance L r electric current is linearly reduced to zero and then be oppositely increased to I5 by the I4 born, final I5 is greater than I4, this stage is the process inputing to inductance makeup energy, and inductance L r electric current is linearly reduced to zero and is then oppositely increased to I5 from reverse I4, and output current is provided by filter capacitor C2.
As shown in Figure 2 and Figure 4, the 6th stage:
In the t5 moment, second switch pipe Q2 and the 3rd switching tube Q3 turns off simultaneously, after this there is parallel resonance in inductance L r and electric capacity Cr, until the 9th switching tube Q9 conducting, now vCr=-V2, wherein V2 represents output voltage, and input and output do not have energy to pass in this process, and output current is still provided by filter capacitor C2.Energy transmits between inductance and electric capacity, but the gross energy on inductance L r and electric capacity Cr is constant.
As shown in Figure 2 and Figure 7, the 7th stage:
In the t6 moment, vCr=-V2, after this anti-also diode seven D7 conducting of anti-also diode six D6 and the 7th switching tube Q7 of the 6th switching tube Q6, electric current in inductance L r flows through the anti-of the 6th switching tube Q6 and the anti-also diode D7 of diode D6 and the 7th switching tube Q7 charges to filter capacitor C2, and provides load current.During this period of time, vCr remains unchanged, inductance L r power on cleanliness reduce.The energy of input is exactly pass to load during this period, and this process is until the 9th switching tube shutoff just terminates.
As shown in Figure 2 and Figure 4, the 8th stage:
In the t7 moment, iLr=I7, vCr=-V2, wherein iLr represents the electric current of resonant inductance Lr, and I7 represents the electric current of resonant inductance Lr in the t7 moment, and after this anti-also diode D7 of the anti-also diode D6 and the 7th switching tube Q7 of the 6th switching tube Q6 turns off, after this there is parallel resonance in inductance L r and electric capacity Cr, until vCr=-V1, during this period of time, energy and be constant on inductance L r and electric capacity Cr.
When it works in boost mode:
As shown in Figure 8 and Figure 9, the first stage:
In the t0 moment, 5th switching tube Q5 and the 8th switching tube Q8 conducting, vCr=V2, wherein vCr represents the voltage of the electric capacity in resonant element, V2 represents the voltage of input DC power, during conducting, the 5th switching tube Q5 and the 8th switching tube Q8 do not have voltage, achieve the no-voltage conducting of the 5th switching tube Q5 and the 8th switching tube Q8, input current circuit is by direct-current input power supplying, the anti-also diode D9 of switching tube nine Q9, 5th switching tube Q5, inductance L r, 8th switching tube Q8 is formed, voltage on inductance L r equals input voltage, inductive current linearly increases, this stage is the process inputing to inductance makeup energy, inductive current is linearly increased to I1 from I0, output current is provided by filter capacitor.
As shown in figs, second stage:
In the t1 moment, 5th switching tube Q5 and the 8th switching tube Q8 turns off simultaneously, inductance L r, there is parallel resonance in electric capacity Cr, until vCr=-V1, wherein V1 represents output voltage, input and output do not have Energy Transfer in this process, output current is still provided by filter capacitor C1, and energy transmits between inductance L r and electric capacity Cr, but gross energy on inductance and electric capacity is constant.
As shown in Figure 8 and Figure 11, the phase III:
In the t2 moment, vCr=-V1, after this instead also diode D4 conducting of the anti-also diode D1 and the 4th switching tube Q4 of the first switching tube Q1, the electric current in inductance L r flows through instead and diode D1, and instead also diode D4 charges to filter capacitor C1, and load current is provided, during this period of time, vCr remains unchanged, inductance L r power on cleanliness reduce, the energy of input passes to load during this period, and this process is until inductance L r electric current is zero end.
As shown in figs, fourth stage:
In the t3 moment, iLr=I3=0, vCr=V1, wherein iLr represents the electric current of resonant inductance Lr, I3 represents the electric current of resonant inductance Lr in the t3 moment, after this anti-also diode D1, anti-and diode D4 turns off, and achieves the zero-current switching of rectifier diode, after this there is parallel resonance in inductance L r and electric capacity Cr, until vCr=-V2, during this period of time, the gross energy on inductance L r and electric capacity Cr is constant.
As shown in figs. 8 and 12, five-stage:
In the t4 moment, 6th switching tube Q6 and the 7th switching tube Q7 conducting, vCr=-V2, during conducting, the 6th switching tube Q6 and the 7th switching tube Q7 do not have voltage, achieve the no-voltage conducting of the 6th switching tube Q6 and the 7th switching tube Q7, input current circuit is by direct-current input power supplying, the anti-also diode D9 of switching tube nine Q9, 6th switching tube Q6, inductance L r, 7th switching tube Q7 is formed, voltage on inductance L r equals negative input voltage, inductance L r electric current linearly oppositely increases, this stage is the process inputing to inductance makeup energy, inductance L r electric current reverse linear from I4 is increased to I5, output current is provided by filter capacitor C1.
As shown in figs, the 6th stage:
In the t5 moment, 6th switching tube Q6 and the 7th switching tube Q7 turns off simultaneously, after this there is parallel resonance in inductance L r and electric capacity Cr, until vCr=V1, input and output do not have Energy Transfer in this process, output current is still provided by filter capacitor C1, and energy transmits between inductance L r and electric capacity Cr, but gross energy on inductance and electric capacity is constant.
As shown in figure 8 and 13, the 7th stage:
In the t6 moment, vCr=V1, after this instead also diode D3 conducting of the anti-also diode D2 and the 3rd switching tube Q3 of second switch pipe Q2, the electric current in inductance L r flows through instead and diode D2, and instead also diode D3 charges to filter capacitor C1, and load current is provided, during this period of time, vCr remains unchanged, inductance L r power on cleanliness reduce, the energy of input passes to load during this period, and this process is until inductive current is zero end.
As shown in figs, the 8th stage:
In the t7 moment, iLr=I7=0, vCr=V1, I7 represents the electric current of resonant inductance Lr in the t7 moment, and after this anti-and diode D2 and anti-also diode D3 turns off, and achieves the zero-current switching of rectifier diode, after this there is parallel resonance in inductance L r and electric capacity Cr, until vCr=V2, during this period of time, the gross energy on inductance and electric capacity is constant.
As controlled resonant converter, it works in boost mode:
Input voltage V1 is 100V, output voltage is 1kV, power output is 1kW, resonant inductance Lr is 630uH, and resonant capacitance Cr is 0.5uF, and the work period is 170uS, all switching tubes all achieve no-voltage conducting and near zero voltage turns off, rectifier diode is zero-current switching, and loss is very little, and efficiency is very high.
As controlled resonant converter, it works in decompression mode:
Input voltage V1 is 300V, and output voltage is 20V, and power output is 40W, and resonant inductance Lr is 3.6mH, resonant capacitance Cr is 0.23uF, and the work period is 440uS, and all switching tubes all achieve near zero voltage and turn off, rectifier diode is zero-current switching, and loss is very little, and efficiency is very high.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of this right.
Claims (12)
1. a LC two-way resonance DC/DC in parallel converter, described converter is applicable to high-power situation; It is characterized in that: described converter comprises converter module 1, resonant element and the converter module 2 connected successively; Described variator module 1 comprises DC power supply in parallel, filter capacitor and converter brachium pontis respectively with described converter module 2; Described brachium pontis comprises two in parallel branch roads be composed in series by two switching tubes; Described resonant element connects between two switching tubes in each described branch road respectively.
2. a kind of LC as claimed in claim 1 two-way resonance DC/DC in parallel converter, is characterized in that: each described switching tube all has the diode of reverse parallel connection; Branch road in described converter module 1 comprises the upper pipe Q2 of series connection and the upper pipe Q1 of lower pipe Q4 and series connection and lower pipe Q3; Branch road in described variator module 2 comprises Q6 and Q8 of series connection and Q5 and Q7 of series connection.
3. a kind of LC as claimed in claim 2 two-way resonance DC/DC in parallel converter, is characterized in that: described resonant element comprises inductance L r in parallel and electric capacity Cr; The first end of described resonant element is respectively between connecting valve pipe Q1 and Q3 and between switching tube Q6 and Q8; Second end of described resonant element is respectively between connecting valve pipe Q2 and Q4 and between switching tube Q5 and Q7.
4. a kind of LC as claimed in claim 1 two-way resonance DC/DC in parallel converter, is characterized in that: the converter brachium pontis in described variator module 2 and tandem tap pipe Q9 between its filter capacitor, described switching tube Q9 anti-parallel diodes D9.
5. the control method of a kind of LC two-way resonance DC/DC in parallel converter as described in claim 1-4 any one, is characterized in that: described method comprises eight stages; In the first phase during step-down work, described switching tube Q1 and switching tube Q4 conducting, the voltage VCr of described electric capacity Cr is the voltage V1 of the DC power supply of negative described converter module 1;
Described inductance L r electric current is linearly reduced to zero and then be oppositely increased to I1 until it is the process inputing to inductance makeup energy that I1 is greater than I0 by positive I0, and its output current is provided by filter capacitor C2;
During boosting work, described switching tube Q5 and switching tube Q8 conducting, the voltage VCr of the electric capacity in described resonant element is the voltage V2 of the DC power supply of described converter module 2, and the voltage on described inductance L r equals input voltage, and described inductive current linearly increases; This stage is the process inputing to inductance makeup energy, and inductive current is linearly increased to I1 from I0, and output current is provided by filter capacitor.
6. method as claimed in claim 5, it is characterized in that: in second stage during step-down work, described switching tube Q1 and switching tube Q4 turns off simultaneously, and parallel resonance occurs described inductance L r and electric capacity Cr until described switching tube Q9 conducting, and the voltage VCr of described electric capacity Cr equals described voltage V2; In this stage, input and the output of described converter do not have Energy Transfer, and output current is still provided by filter capacitor C2; The energy of converter transmits between described inductance L r and electric capacity Cr, but gross energy on inductance L r and electric capacity Cr is constant;
During boosting work, described switching tube Q5 and switching tube Q8 turns off simultaneously, and described inductance L r and electric capacity Cr parallel resonance occurs until described voltage VCr is negative described voltage V1; The input of described converter and output do not have Energy Transfer in this stage, and output current is still provided by filter capacitor C1, and energy transmits between described inductance L r and electric capacity Cr, and the gross energy of described inductance and electric capacity is constant.
7. method as claimed in claim 6, it is characterized in that: in the phase III during step-down work, the anti-also diode D8 conducting of the anti-also diode D5 and switching tube Q8 of described switching tube Q5, electric current in described inductance L r flows through the anti-of switching tube Q5 and the anti-also diode D8 of diode D5 and switching tube Q8 is that filter capacitor C2 charges, and provides load current; In this stage, the voltage of described electric capacity Cr remains unchanged, described inductance L r power on cleanliness reduce; The energy of converter input be exactly this stage pass to load until described switching tube Q9 turns off terminates;
During boosting work, the anti-also diode D4 conducting of the anti-also diode D1 and switching tube Q4 of described switching tube Q1, electric current in described inductance L r flows through anti-also diode D1, described anti-also diode D4 charges to filter capacitor C1, and load current is provided, within this stage, described electric capacity VCr remains unchanged, the cleanliness that powers on described inductance L r reduces, and the energy of described converter input passes to load until described inductance L r electric current is zero end within this stage.
8. method as claimed in claim 7, it is characterized in that: in fourth stage during step-down work, the current i Lr of described resonant inductance Lr is I3, the voltage VCr of described electric capacity Cr is described output voltage V2, the anti-also diode D8 of the anti-also diode D5 and described switching tube Q8 of described switching tube Q5 turns off, and described inductance L r and electric capacity Cr parallel resonance occurs until described voltage VCr equals described voltage V1; In this stage, energy and constant on described inductance L r and electric capacity Cr;
During boosting work, the current i Lr=I3=0 of described resonant inductance Lr, described anti-also diode D1, anti-and diode D4 turns off, there is parallel resonance until described voltage Cr is negative described V2 in described inductance L r and electric capacity Cr, in this stage, the gross energy on described inductance L r and electric capacity Cr is constant.
9. method as claimed in claim 8, it is characterized in that: in five-stage during step-down work, described switching tube Q2 and switching tube Q3 conducting, described voltage VCr is described voltage V1, voltage on described inductance L r equals input voltage V1, and described inductance L r electric current is linearly reduced to zero and then be oppositely increased to I5 until I5 is greater than I4 by the I4 born;
This stage is the process that described converter inputs to inductance makeup energy, and described inductance L r electric current is linearly reduced to zero and is then oppositely increased to I5 from reverse I4, and the output current of described converter is provided by filter capacitor C2;
During boosting work, described switching tube Q6 and switching tube Q7 conducting, described voltage Cr is negative described voltage V2, voltage on described inductance L r equals negative input voltage, described inductance L r electric current linearly oppositely increases, this stage is the process inputing to inductance makeup energy, and described inductance L r electric current reverse linear from I4 is increased to I5, and output current is provided by filter capacitor C1.
10. method as claimed in claim 9, it is characterized in that: in the 6th stage during step-down work, described switching tube Q2 and described switching tube Q3 turns off simultaneously, and parallel resonance occurs described inductance L r and electric capacity Cr until described switching tube Q9 conducting, and described voltage VCr is negative described voltage V2; In this stage, the input of described converter and output do not have energy to pass, and output current is still provided by filter capacitor C2; The energy of described converter transmits between inductance and electric capacity, and the gross energy on described inductance L r and electric capacity Cr is constant;
During boosting work, described switching tube Q6 and the 7th switching tube Q7 turns off simultaneously, parallel resonance occurs described inductance L r and electric capacity Cr until described voltage VCr is described voltage V1, input and output do not have Energy Transfer in this stage, output current is still provided by filter capacitor C1, energy transmits between inductance L r and electric capacity Cr, and the gross energy on described inductance and electric capacity is constant.
11. methods as claimed in claim 10, it is characterized in that: in the 7th stage during step-down work, described voltage VCr equals negative described voltage V2, the anti-also diode seven D7 conducting of anti-also diode six D6 and switching tube Q7 of described switching tube Q6, electric current in described inductance L r flows through the anti-of switching tube Q6 and the anti-also diode D7 of diode D6 and switching tube Q7 is that described filter capacitor C2 charges, and provides load current; In this stage, described voltage VCr remains unchanged, described inductance L r power on cleanliness reduce; The energy of the input of described converter be exactly this stage pass to inside load until described switching tube turns off just terminate this stage;
During boosting work, described voltage VCr equals described voltage V1, the anti-also diode D3 conducting of the anti-also diode D2 and switching tube Q3 of described switching tube Q2, electric current in described inductance L r flows through anti-also diode D2, and described anti-also diode D3 charges to filter capacitor C1, and provides load current, within this stage, described voltage VCr remains unchanged, described inductance L r power on cleanliness reduce, the energy of the input of described converter passes to load until described inductive current is zero end in this stage.
12. methods as claimed in claim 11, it is characterized in that: in the 8th stage during step-down work, the current i Lr of described resonant inductance Lr equals I7, described voltage VCr is negative described voltage V2, the anti-also diode D7 of the anti-also diode D6 and switching tube Q7 of described switching tube Q6 turns off, and described inductance L r and electric capacity Cr parallel resonance occurs until described voltage VCr is negative described voltage V1; In this stage, energy and constant on described inductance L r and electric capacity Cr;
During boosting work, the current i Lr=I7=0 of described resonant inductance Lr, described voltage VCr is described voltage V1, described anti-also diode D2 and anti-also diode D3 turns off, there is parallel resonance until described voltage VCr equals described voltage V2 in described inductance L r and electric capacity Cr, in this stage, the gross energy on described inductance and electric capacity is constant.
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| CN101577489A (en) * | 2009-05-14 | 2009-11-11 | 湖南银河电气有限公司 | Soft switching converter suitable for sensitive bidirectional current loads |
| US20110317452A1 (en) * | 2010-06-25 | 2011-12-29 | Gueorgui Iordanov Anguelov | Bi-directional power converter with regulated output and soft switching |
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