CN102710139A - Full-bridge three-port bidirectional direct-current converter and control method thereof - Google Patents

Abstract

The invention discloses a full-bridge three-port bidirectional direct-current converter and a control method thereof, belonging to the field of power electronics converters. The converter is composed of a primary side circuit, a secondary side circuit and an isolation transformer, wherein the primary side circuit is composed of a full-bridge circuit integrating two paths of Buck-Boost converters, and the secondary side circuit is composed of the full-bridge circuit; and the converter comprises three ports in total, the power of each port is available for bidirectional flow, and the power control of any two ports can be realized at the same time by controlling the duty cycle of switching tubes in the two full-bridge circuits and the phase shift angles of the corresponding switching tubes of the two full-bridge circuits. According to the invention, by integrating a non-isolation bidirectional Buck-Boost converts and a full-bridge bidirectional converter to constitute the integrated three-port converter and simultaneously realize the power control of multiple ports, the quantity of used switch devices is reduced, the cost is reduced, the power density and reliability are increased, and the full-bridge three-port bidirectional direct-current converter is suitable for new energy power generation, hybrid energy storage and other power supply systems.

Description

A kind of full-bridge three port two-way DC converter and control methods thereof

Technical field

The present invention relates to a kind of full-bridge three port two-way DC converter and control methods thereof, belong to the converters technical field, particularly the converters technical field in generation of electricity by new energy and the hybrid energy-storing technical field.

Background technology

Along with energy crisis and problem of environmental pollution are serious day by day, generation of electricity by new energy becomes and realizes one of effective measures of human kind sustainable development.The intrinsic defective of generation of electricity by new energy equipment has been brought some a new difficult problem and challenges for the new energy system, and for example, solar energy and wind energy energy density are lower, and it is bigger to be affected by the external environment, and supply of electric power is unstable, discontinuous.In order to address the above problem, play energy balance and supporting role through the energy storage device that is equipped with a constant volume usually, in time the peak power in short-term of replenishment system reclaims surplus power, guarantees the continuity and the reliability of power supply, improves the utilance of electric energy.In comprising the new energy system of energy storage device, need simultaneously the power of generation of electricity by new energy equipment, energy storage device and load to be controlled.

In recent years, the distributed new electricity generation system has received extensive concern.In the distributed system, the maximal power tracing of each generation of electricity by new energy equipment can be realized, system's energy output can be significantly improved, and because generation of electricity by new energy equipment output voltage is lower, usually need be with the generating equipment series connection to satisfy voltage requirements.In this type of grid-connected power generation system, thereby need provide a kind of generating equipment that can adapt to be connected in series, again can be simultaneously the power of each input source to be carried out the power conversion unit that independent control realizes distributed maximal power tracing.

The hybrid energy-storing technology that is made up of storage battery and super capacitor has also obtained application more and more widely; Storage battery provides the energy storage; Super capacitor provides peak power; Both combinations can be improved the power density and the energy density of energy-storage system simultaneously, improve energy-storage system dynamically and steady-state behaviour.In mixed energy storage system, also need simultaneously the power of storage battery, super capacitor and power supply load to be controlled.

In above-mentioned application background; All need control the power of a plurality of equipment (generating equipment, energy storage device and load); Traditional solution need adopt a plurality of two-port converter combinations to constitute power management and control system usually, yet because many, each converter time-sharing work of converter number, system power density is low, volume weight is big, cost is high; And because the decentralized control and working alone separately each other of each converter diminishes systematic steady state and dynamic property.To the problem of above-mentioned application background and existence, the research worker proposes to adopt three port converters to replace above-mentioned a plurality of independently converter to realize the power management of independent grid-connected power generation system.According to port isolation situation classification, three port converters comprise that port is all isolated, part is isolated and three types of non-isolation.The three port converters that port is all isolated constitute through the mode of a plurality of Transformer Winding couplings usually, and such three ports converter is because each port is isolated from each other, and port adaptability is better, but the device count of using is many, control is complicated.Non-isolation three port converters do not need isolated variable, and efficient is higher, but port adaptability is bad, can only be applicable to the approximating application scenario of voltage between port.Partially isolated three port converters are integrated together isolated converter and non-isolated converter usually; The part of isolated converter and non-isolated converter is active or passive device is shared each other, has the advantage of isolating three port converters and non-isolation three port converters simultaneously concurrently.

Summary of the invention

1, goal of the invention: the present invention is directed to the above-mentioned background technology, provide that a kind of topological structure is succinct, integrated level is high, simple full-bridge three port two-way DC converter and the control methods thereof of control.

2, technical scheme: for realizing above-mentioned purpose, the present invention takes following technical scheme.

Said full-bridge three port two-way DC converters are made up of former limit circuit, secondary circuit and isolating transformer, its limit, Central Plains circuit the has been integrated full-bridge circuit of the two-way Buck-Boost converter of two-way, and secondary circuit is a full-bridge circuit; Converter comprises three ports altogether; Wherein the power of each port can two-way flow; The phase shifting angle of the duty ratio through controlling switching tube in two full-bridge circuits and two corresponding switching tubes of full-bridge circuit can be realized the wherein power control of any two ports simultaneously.

Said full-bridge three port two-way DC converters are by the first I/O end (U ₁), the second I/O end (U ₂), the 3rd I/O end (U ₃), the first electric capacity (C ₁), the second electric capacity (C ₂), the 3rd electric capacity (C ₃), the first inductance (L ₁), the second inductance (L ₂), the 3rd inductance (L ₃), the first switching tube (S ₁), second switch pipe (S ₂), the 3rd switching tube (S ₃), the 4th switching tube (S ₄), the 5th switching tube (S ₅), the 6th switching tube (S ₆), the 7th switching tube (S ₇), the 8th switching tube (S ₈) and transformer (T) formation, wherein transformer (T) comprises former limit winding (N _P) and secondary winding (N _S); The first I/O end (U ₁) positive pole be connected in the first electric capacity (C respectively ₁) positive pole, the first switching tube (S ₁) drain electrode and the 3rd switching tube (S ₃) drain electrode, the first I/O end (U ₁) negative pole be connected in the first electric capacity (C respectively ₁) negative pole, the second electric capacity (C ₂) positive pole, the first inductance (L ₁) an end, the second inductance (L ₂) an end and the second I/O end (U ₂) positive pole; The second I/O end (U ₂) negative pole be connected in the second electric capacity (C respectively ₂) negative pole, second switch pipe (S ₂) source electrode and the 4th switching tube (S ₄) source electrode, the 3rd inductance (L ₃) an end be connected in the first inductance (L respectively ₁) the other end, the first switching tube (S ₁) source electrode and second switch pipe (S ₂) drain electrode, the 3rd inductance (L ₃) the other end be connected in transformer (T) former limit winding (N _P) end of the same name, transformer (T) former limit winding (N _P) non-same polarity be connected in the second inductance (L respectively ₂) the other end, the 3rd switching tube (S ₃) source electrode and the 4th switching tube (S ₄) drain electrode; Transformer (T) secondary winding (N _S) end of the same name be connected in the 5th switching tube (S respectively ₅) source electrode and the 6th switching tube (S ₆) drain electrode, transformer (T) secondary winding (N _S) non-same polarity be connected in the 7th switching tube (S respectively ₇) source electrode and the 8th switching tube (S ₈) drain electrode; The 3rd I/O end (U ₃) positive pole be connected in the 5th switching tube (S respectively ₅) drain electrode, the 7th switching tube (S ₇) drain electrode and the 3rd electric capacity (C ₃) positive pole, the 3rd I/O end (U ₃) negative pole be connected in the 6th switching tube (S respectively ₆) source electrode, the 8th switching tube (S ₈) source electrode and the 3rd electric capacity (C ₃) negative pole.

The control method of full-bridge three port two-way DC converters according to the invention: the said first switching tube (S ₁) and second switch pipe (S ₂) complementary conducting, the 3rd switching tube (S ₃) and the 4th switching tube (S ₄) complementary conducting, the first switching tube (S ₁) and the 3rd switching tube (S ₃) the duty ratio equal and opposite in direction, second switch pipe (S ₂) and the 4th switching tube (S ₄) the duty ratio equal and opposite in direction, the first switching tube (S ₁) open leading the 3rd switching tube (S constantly ₃) open 180 ° constantly, second switch pipe (S ₂) open leading the 4th switching tube (S constantly ₄) open 180 ° constantly; Said the 5th switching tube (S ₅) and the 6th switching tube (S ₆) complementary conducting, the 7th switching tube (S ₇) and the 8th switching tube (S ₈) complementary conducting, the 5th switching tube (S ₅), the 6th switching tube (S ₆), the 7th switching tube (S ₇), the 8th switching tube (S ₈) duty ratio be 0.5, the five switching tube (S ₅) open leading the 7th switching tube (S constantly ₇) open 180 ° constantly, the 6th switching tube (S ₆) open leading the 8th switching tube (S constantly ₈) open 180 ° constantly; Through regulating the first switching tube (S ₁), second switch pipe (S ₂), the 3rd switching tube (S ₃) and the 4th switching tube (S ₄) duty recently regulate the first I/O end (U ₁) and the second I/O end (U ₂) voltage relationship, through regulating the first switching tube (S ₁) and the 5th switching tube (S ₅) phase shifting angle regulate the first I/O end (U ₁) and the second I/O end (U ₂) voltage sum (U ₁+ U ₂) and the 3rd I/O end (U ₃) voltage relationship.

Characteristics of the present invention and technique effect:

(1) realize power management and control to three ports through an integrated converter, circuit element is shared each other, has reduced the quantity of used device, has reduced cost, has improved power density and reliability;

(2) power of any port of converter can two-way flow, and is applied widely;

(3) Power Conversion between any two ports of converter, the path of existing non-isolated variable in order to improve conversion efficiency, has the path of isolated variable again, in order to expand the demand of load and application scenario;

(4) converter using centralized control can realize more effectively energy management.

Description of drawings

Accompanying drawing 1 is the circuit structure schematic diagram of full-bridge three port two-way DC converters of the present invention;

Accompanying drawing 2 is groundwork oscillograms of full-bridge three port two-way DC converters of the present invention;

Accompanying drawing 3-accompanying drawing 8 is full-bridge three port two-way DC converters of the present invention equivalent circuit diagrams under each switch mode;

Designation in the above accompanying drawing: U ₁It is the first I/O end; U ₂It is the second I/O end; U ₃It is the 3rd I/O end; C ₁, C ₂, C ₃Be respectively first, second, third electric capacity; L ₁, L ₂, L ₃Be respectively first, second and the 3rd inductance; S ₁～S ₈Be respectively first～the 8th switching tube; T is a transformer, N _P, N _SBe respectively the former limit winding and the secondary winding of transformer (T); u _GS1～u _GS8Be respectively the drive signal of first～the 8th switching tube; u _PVoltage for winding two ends, the former limit of transformer; u _SVoltage for transformer secondary winding two ends; i _L1It is the electric current of first inductance; i _L2Be the electric current of second inductance, u _L3Be the voltage at the 3rd inductance two ends, i _L3It is the electric current of the 3rd inductance.

Embodiment

Below in conjunction with accompanying drawing the present invention is described further.

To grid-connected power generation system and mixed energy storage system, the present invention proposes a kind of full-bridge three port two-way DC converter and control methods thereof, its circuit structure is shown in accompanying drawing 1.This converter is made up of former limit circuit, secondary circuit and isolating transformer, its limit, Central Plains circuit the has been integrated full-bridge circuit of the two-way Buck-Boost converter of two-way, and secondary circuit is a full-bridge circuit; Converter comprises three ports altogether; Wherein the power of each port can two-way flow; The phase shifting angle of the duty ratio through controlling switching tube in two full-bridge circuits and two corresponding switching tubes of full-bridge circuit can be realized the wherein power control of any two ports simultaneously.The present invention is through being integrated together two-way Buck-Boost converter of non-isolation and full-bridge reversible transducer; Constitute three integrated port converters, realize power control simultaneously, reduced the quantity of used switching device a plurality of ports; Reduce cost, improved power density and reliability.

Shown in accompanying drawing 1, said full-bridge three port two-way DC converters are by the first I/O end (U ₁), the second I/O end (U ₂), the 3rd I/O end (U ₃), the first electric capacity (C ₁), the second electric capacity (C ₂), the 3rd electric capacity (C ₃), the first inductance (L ₁), the second inductance (L ₂), the 3rd inductance (L ₃), the first switching tube (S ₁), second switch pipe (S ₂), the 3rd switching tube (S ₃), the 4th switching tube (S ₄), the 5th switching tube (S ₅), the 6th switching tube (S ₆), the 7th switching tube (S ₇), the 8th switching tube (S ₈) and transformer (T) formation, wherein transformer (T) comprises former limit winding (N _P) and secondary winding (N _S); The first I/O end (U ₁) positive pole be connected in the first electric capacity (C respectively ₁) positive pole, the first switching tube (S ₁) drain electrode and the 3rd switching tube (S ₃) drain electrode, the first I/O end (U ₁) negative pole be connected in the first electric capacity (C respectively ₁) negative pole, the second electric capacity (C ₂) positive pole, the first inductance (L ₁) an end, the second inductance (L ₂) an end and the second I/O end (U ₂) positive pole; The second I/O end (U ₂) negative pole be connected in the second electric capacity (C respectively ₂) negative pole, second switch pipe (S ₂) source electrode and the 4th switching tube (S ₄) source electrode, the 3rd inductance (L ₃) an end be connected in the first inductance (L respectively ₁) the other end, the first switching tube (S ₁) source electrode and second switch pipe (S ₂) drain electrode, the 3rd inductance (L ₃) the other end be connected in transformer (T) former limit winding (N _P) end of the same name, transformer (T) former limit winding (N _P) non-same polarity be connected in the second inductance (L respectively ₂) the other end, the 3rd switching tube (S ₃) source electrode and the 4th switching tube (S ₄) drain electrode; Transformer (T) secondary winding (N _S) end of the same name be connected in the 5th switching tube (S respectively ₅) source electrode and the 6th switching tube (S ₆) drain electrode, transformer (T) secondary winding (N _S) non-same polarity be connected in the 7th switching tube (S respectively ₇) source electrode and the 8th switching tube (S ₈) drain electrode; The 3rd I/O end (U ₃) positive pole be connected in the 5th switching tube (S respectively ₅) drain electrode, the 7th switching tube (S ₇) drain electrode and the 3rd electric capacity (C ₃) positive pole, the 3rd I/O end (U ₃) negative pole be connected in the 6th switching tube (S respectively ₆) source electrode, the 8th switching tube (S ₈) source electrode and the 3rd electric capacity (C ₃) negative pole.

The control method of full-bridge three port two-way DC converters according to the invention: the said first switching tube (S ₁) and second switch pipe (S ₂) complementary conducting, the 3rd switching tube (S ₃) and the 4th switching tube (S ₄) complementary conducting, the first switching tube (S ₁) and the 3rd switching tube (S ₃) the duty ratio equal and opposite in direction, second switch pipe (S ₂) and the 4th switching tube (S ₄) the duty ratio equal and opposite in direction, the first switching tube (S ₁) open leading the 3rd switching tube (S constantly ₃) open 180 ° constantly, second switch pipe (S ₂) open leading the 4th switching tube (S constantly ₄) open 180 ° constantly; Said the 5th switching tube (S ₅) and the 6th switching tube (S ₆) complementary conducting, the 7th switching tube (S ₇) and the 8th switching tube (S ₈) complementary conducting, the 5th switching tube (S ₅), the 6th switching tube (S ₆), the 7th switching tube (S ₇), the 8th switching tube (S ₈) duty ratio be 0.5, the five switching tube (S ₅) open leading the 7th switching tube (S constantly ₇) open 180 ° constantly, the 6th switching tube (S ₆) open leading the 8th switching tube (S constantly ₈) open 180 ° constantly; Through regulating the first switching tube (S ₁), second switch pipe (S ₂), the 3rd switching tube (S ₃) and the 4th switching tube (S ₄) duty recently regulate the first I/O end (U ₁) and the second I/O end (U ₂) voltage relationship, through regulating the first switching tube (S ₁) and the 5th switching tube (S ₅) phase shifting angle regulate the first I/O end (U ₁) and the second I/O end (U ₂) voltage sum (U ₁+ U ₂) and the 3rd I/O end (U ₃) voltage relationship.

Can know according to accompanying drawing 1 and above-mentioned analysis; Full-bridge three port two-way DC converters according to the invention can be realized power control and the management to any two ports in three ports simultaneously; And the power flow between any two ports is single-stage power conversion, has higher conversion efficiency.

The concrete course of work below in conjunction with 8 pairs of full-bridge three port two-way DC converters of the present invention of accompanying drawing 2～accompanying drawing is analyzed.

The turn ratio of supposing the former limit of transformer, secondary winding satisfies N _P: N _S=n: 1, n is a positive number, supposes that simultaneously first, second, third electric capacity is all enough big, the voltage of three input/output end ports all is level and smooth direct current.

The groundwork waveform of said converter is shown in accompanying drawing 2, and converter has six main switch mode in a switch periods.

Switch mode 1 [t ₀-t ₁]: t ₀Constantly, former limit switching tube S ₂And S ₄Conducting, S ₁And S ₃Turn-off; Secondary-side switch pipe S ₆And S ₇Conducting, S ₅And S ₈Turn-off; The first inductive current i _L1, the second inductive current i _L2, the 3rd inductive current i _L3All linearity reduces; t ₀Constantly, S ₂Turn-off S ₁Conducting, equivalent electric circuit shown in accompanying drawing 3, under this mode, i _L1, i _L2And i _L3Satisfy following relation:

$\left\{\begin{array}{c}\frac{{\mathrm{di}}_{L1}}{\mathrm{dt}}=\frac{U_1}{L_1}\\ \frac{{\mathrm{di}}_{L2}}{\mathrm{dt}}=\frac{-U_2}{L_2}\\ \frac{{\mathrm{di}}_{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HSA00000737593000012.png"\; state="\{\{state\}\}">L</figure-callout>}3}}{\mathrm{dt}}=\frac{U_1+U_2+n{U}_3}{L_3}\end{array}\right.---\left(1\right)$

Switch mode 2 [t ₁-t ₂]: t ₁Constantly, secondary-side switch pipe S ₆And S ₇Turn-off S ₅And S ₈Conducting, equivalent electric circuit shown in accompanying drawing 4, under this mode, i _L1, i _L2And i _L3Satisfy following relation:

$\left\{\begin{array}{c}\frac{{\mathrm{di}}_{L1}}{\mathrm{dt}}=\frac{U_1}{L_1}\\ \frac{{\mathrm{di}}_{L2}}{\mathrm{dt}}=\frac{-U_2}{L_2}\\ \frac{{\mathrm{di}}_{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HSA00000737593000012.png"\; state="\{\{state\}\}">L</figure-callout>}3}}{\mathrm{dt}}=\frac{U_1+U_2-n{U}_3}{L_3}\end{array}\right.---\left(2\right)$

Switch mode 3 [t ₂-t ₃]: t ₂Constantly, former limit switching tube S ₁Turn-off S ₂Conducting, equivalent electric circuit shown in accompanying drawing 5, under this mode, i _L1, i _L2And i _L3Satisfy following relation:

$\left\{\begin{array}{c}\frac{{\mathrm{di}}_{L1}}{\mathrm{dt}}=\frac{{-U}_2}{L_1}\\ \frac{{\mathrm{di}}_{L2}}{\mathrm{dt}}=\frac{-U_2}{L_2}\\ \frac{{\mathrm{di}}_{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HSA00000737593000012.png"\; state="\{\{state\}\}">L</figure-callout>}3}}{\mathrm{dt}}=\frac{-n{U}_3}{L_3}\end{array}\right.---\left(3\right)$

Switch mode 4 [t ₃-t ₄]: t ₃Constantly, former limit switching tube S ₄Turn-off S ₃Conducting, equivalent electric circuit shown in accompanying drawing 6, under this mode, i _L1, i _L2And i _L3Satisfy following relation:

$\left\{\begin{array}{c}\frac{{\mathrm{di}}_{L1}}{\mathrm{dt}}=\frac{{-U}_2}{L_1}\\ \frac{{\mathrm{di}}_{L2}}{\mathrm{dt}}=\frac{U_1}{L_2}\\ \frac{{\mathrm{di}}_{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HSA00000737593000012.png"\; state="\{\{state\}\}">L</figure-callout>}3}}{\mathrm{dt}}=\frac{{-U}_1-U_2-n{U}_3}{L_3}\end{array}\right.---\left(4\right)$

Switch mode 5 [t ₄-t ₅]: t ₄Constantly, secondary-side switch pipe S ₅And S ₈Turn-off S ₆And S ₇Conducting, equivalent electric circuit shown in accompanying drawing 7, under this mode, i _L1, i _L2And i _L3Satisfy following relation:

$\left\{\begin{array}{c}\frac{{\mathrm{di}}_{L1}}{\mathrm{dt}}=\frac{{-U}_2}{L_1}\\ \frac{{\mathrm{di}}_{L2}}{\mathrm{dt}}=\frac{U_1}{L_2}\\ \frac{{\mathrm{di}}_{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HSA00000737593000012.png"\; state="\{\{state\}\}">L</figure-callout>}3}}{\mathrm{dt}}=\frac{{-U}_1-U_2+n{U}_3}{L_3}\end{array}\right.---\left(5\right)$

Switch mode 6 [t ₅-t ₆]: t ₅Constantly, former limit switching tube S ₃Turn-off S ₄Conducting, equivalent electric circuit shown in accompanying drawing 8, under this mode, i _L1, i _L2And i _L3Satisfy following relation:

$\left\{\begin{array}{c}\frac{{\mathrm{di}}_{L1}}{\mathrm{dt}}=\frac{{-U}_2}{L_1}\\ \frac{{\mathrm{di}}_{L2}}{\mathrm{dt}}=\frac{-U_2}{L_2}\\ \frac{{\mathrm{di}}_{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="HSA00000737593000012.png"\; state="\{\{state\}\}">L</figure-callout>}3}}{\mathrm{dt}}=\frac{{\mathrm{nU}}_o}{L_3}\end{array}\right.---\left(6\right)$

Suppose in a switch periods the first switching tube S ₁, the 3rd switching tube S ₃Duty ratio be d, the 5th switching tube S ₅The first switching tube S lags behind ₁The electrical degree of opening does

The switching frequency of converter is f, then according to the weber equilibrium relation of first inductance, second inductance and the 3rd inductance, obtains the port voltage relation:

$U_2=\frac{d{U}_1}{1-d}---\left(7\right)$

Can know that according to formula (7) and formula (8) said full-bridge three port two-way DC converters comprise two controlled quentity controlled variables, are respectively: switching tube S ₁And S ₃Duty ratio d, switching tube S ₁And S ₅Conducting phase shifting angle constantly Regulate the first I/O end (U through regulating duty ratio d ₁) and the second I/O end (U ₂) voltage relationship, through regulating phase shifting angle

Regulate the first I/O end (U ₁) and the second I/O end (U ₂) voltage sum (U ₁+ U ₂) and the 3rd I/O end (U ₃) voltage relationship.At any one time, through regulating this two controlled quentity controlled variables, can realize the power control to any two ports in three ports, the 3rd remaining port is used for keeping the power-balance of converter.

Claims (3)

1. full-bridge three port two-way DC converters is characterized in that:

Said full-bridge three port two-way DC converters are by the first I/O end (U ₁), the second I/O end (U ₂), the 3rd I/O end (U ₃), the first electric capacity (C ₁), the second electric capacity (C ₂), the 3rd electric capacity (C ₃), the first inductance (L ₁), the second inductance (L ₂), the 3rd inductance (L ₃), the first switching tube (S ₁), second switch pipe (S ₂), the 3rd switching tube (S ₃), the 4th switching tube (S ₄), the 5th switching tube (S ₅), the 6th switching tube (S ₆), the 7th switching tube (S ₇), the 8th switching tube (S ₈) and transformer (T) formation, wherein transformer (T) comprises former limit winding (N _P) and secondary winding (N _S);

The said first I/O end (U ₁) positive pole be connected in the first electric capacity (C respectively ₁) positive pole, the first switching tube (S ₁) drain electrode and the 3rd switching tube (S ₃) drain electrode, the first I/O end (U ₁) negative pole be connected in the first electric capacity (C respectively ₁) negative pole, the second electric capacity (C ₂) positive pole, the first inductance (L ₁) an end, the second inductance (L ₂) an end and the second I/O end (U ₂) positive pole; The second I/O end (U ₂) negative pole be connected in the second electric capacity (C respectively ₂) negative pole, second switch pipe (S ₂) source electrode and the 4th switching tube (S ₄) source electrode, the 3rd inductance (L ₃) an end be connected in the first inductance (L respectively ₁) the other end, the first switching tube (S ₁) source electrode and second switch pipe (S ₂) drain electrode, the 3rd inductance (L ₃) the other end be connected in transformer (T) former limit winding (N _P) end of the same name, transformer (T) former limit winding (N _P) non-same polarity be connected in the second inductance (L respectively ₂) the other end, the 3rd switching tube (S ₃) source electrode and the 4th switching tube (S ₄) drain electrode; Transformer (T) secondary winding (N _S) end of the same name be connected in the 5th switching tube (S respectively ₅) source electrode and the 6th switching tube (S ₆) drain electrode, transformer (T) secondary winding (N _S) non-same polarity be connected in the 7th switching tube (S respectively ₇) source electrode and the 8th switching tube (S ₈) drain electrode; The 3rd I/O end (U ₃) positive pole be connected in the 5th switching tube (S respectively ₅) drain electrode, the 7th switching tube (S ₇) drain electrode and the 3rd electric capacity (C ₃) positive pole, the 3rd I/O end (U ₃) negative pole be connected in the 6th switching tube (S respectively ₆) source electrode, the 8th switching tube (S ₈) source electrode and the 3rd electric capacity (C ₃) negative pole.

2. full-bridge three port two-way DC converters as claimed in claim 1 is characterized in that: the 3rd inductance (L in the said full-bridge three port two-way DC converters ₃) leakage inductance that can pass through transformer (T) realizes.

3. the control method of full-bridge three port two-way DC converters is characterized in that:

The said first switching tube (S ₁) and second switch pipe (S ₂) complementary conducting, the 3rd switching tube (S ₃) and the 4th switching tube (S ₄) complementary conducting, the first switching tube (S ₁) and the 3rd switching tube (S ₃) the duty ratio equal and opposite in direction, second switch pipe (S ₂) and the 4th switching tube (S ₄) the duty ratio equal and opposite in direction, the first switching tube (S ₁) open leading the 3rd switching tube (S constantly ₃) open 180 ° constantly, second switch pipe (S ₂) open leading the 4th switching tube (S constantly ₄) open 180 ° constantly; Said the 5th switching tube (S ₅) and the 6th switching tube (S ₆) complementary conducting, the 7th switching tube (S ₇) and the 8th switching tube (S ₈) complementary conducting, the 5th switching tube (S ₅), the 6th switching tube (S ₆), the 7th switching tube (S ₇), the 8th switching tube (S ₈) duty ratio be 0.5, the five switching tube (S ₅) open leading the 7th switching tube (S constantly ₇) open 180 ° constantly, the 6th switching tube (S ₆) open leading the 8th switching tube (S constantly ₈) open 180 ° constantly; First switching tube (the S ₁), second switch pipe (S ₂), the 3rd switching tube (S ₃), the 4th switching tube (S ₄), the 5th switching tube (S ₅), the 6th switching tube (S ₆), the 7th switching tube (S ₇) and the 8th switching tube (S ₈) switching frequency equate; Through regulating the first switching tube (S ₁), second switch pipe (S ₂), the 3rd switching tube (S ₃) and the 4th switching tube (S ₄) duty recently regulate the first I/O end (U ₁) and the second I/O end (U ₂) voltage relationship, through regulating the first switching tube (S ₁) and the 5th switching tube (S ₅) phase shifting angle regulate the first I/O end (U ₁) and the second I/O end (U ₂) voltage sum (U ₁+ U ₂) and the 3rd I/O end (U ₃) voltage relationship.

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