CN206658155U - A kind of two-way full-bridge resonance DC/DC converter - Google Patents
A kind of two-way full-bridge resonance DC/DC converter Download PDFInfo
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- CN206658155U CN206658155U CN201720150001.3U CN201720150001U CN206658155U CN 206658155 U CN206658155 U CN 206658155U CN 201720150001 U CN201720150001 U CN 201720150001U CN 206658155 U CN206658155 U CN 206658155U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
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Abstract
The utility model provides a kind of two-way full-bridge resonance DC/DC converter, converter includes being sequentially connected the first filter circuit connect, the first full-bridge circuit, resonant transform circuit, the second full-bridge circuit and the second filter circuit, and also include control unit, control unit gathers the first filter circuit, the operating current of the second filter circuit respectively, and control unit is controlled to the first full-bridge circuit and the second full-bridge circuit according to preset signals respectively.Full-bridge circuit is entered active switch pattern or diode mode according to energy flow direction, then realize the efficient two-way changing of energy so that this two-way full-bridge resonance DC/DC converter and its control method more possess practicality.
Description
Technical field
The utility model designs dc source converter technique, more particularly to a kind of two-way full-bridge resonance DC/DC converting
Device.
Background technology
In various application occasions such as new energy photovoltaic system, energy-storage system and charging system for electric automobile, it is desirable to electric energy
Energy in converter can be flowed to the energy-storage units such as battery by power network, be realized the storage of electric energy with two-way flow, energy,
Meanwhile require that energy can flow to power network or the individually output in the form of AC power from energy-storage units again, realize power network electric energy
Regulation or meet the use of electric energy under the conditions of off-network.For security consideration, this bi-directional energy conversion system is preferably
Realize the electrical isolation of input and output.At present, non-isolated ac-dc conversion circuit is highly developed, can be very easily real
The non-isolated energy in bidirectional flow of existing alternating current and intermediate dc unit.Therefore, the efficient isolated DC of electric energy/straight how is realized
Rheology is changed, and is current be badly in need of solving one so as to which that realizes intermediate dc unit and energy-storage units isolates bi-directional energy conversion
Realistic problem.
As long as it is traditional recommend, secondary commutation diode is replaced by out by the hard switching formal argument device such as half-bridge and full-bridge
Guan Guan, it is possible to simply and easily realize the two-way changing of circuit.But these hard switching circuits are because switching loss is excessive, conversion
It is less efficient, it is not suitable for high-power and frequency applications occasion.Especially, primary side switch can be realized by shifting to full-bridge circuit form
Pipe it is soft open-minded, while can also simply and easily realize the double of circuit by the way that secondary commutation diode is replaced by into switching tube
To conversion.But it has two defects：First, secondary rectifying tube can not realize zero-current switching, second, primary side switch in the case of underloading
Pipe can not realize zero current turning-on.Which also limits shift to application of the full-bridge circuit in isolation bidirectional, dc conversion field.
Resonant transform circuit especially LLC resonant transform circuits are a kind of soft switch circuits that fast development is got up in recent years
Topology.By taking existing LLC series resonant converters as an example, because resonant element is operated in sinusoidal resonance state, on switching tube
Voltage can be with natural zero-crossing so as to realizing that no-voltage is open-minded, and is easily achieved the zero-current switching of secondary rectifying tube, so as to
The turn-on consumption of switching tube is reduced, improves the whole efficiency of power supply.This kind of topological generally use Frequency-variable Modulation (PFM) side
Formula, the working frequency by adjusting switching tube reach the purpose of regulated output voltage.
The control principle of converter is by the complementary conducting of upper down tube to each bridge arm of full-bridge, the duty of each switching tube
Than simultaneously turning on and turning off close to 50%, and to Q1 and Q4 and Q2 and Q3, then the voltage being added on resonant network be+Vin~-
The square wave that Vin changes, dutycycle 50%, voltage effective value is close to Vin.If adjust output only with warbled mode
Voltage, then the relation of electric power output voltage gain and switching frequency be：
Wherein, Vin and Vout is respectively input voltage and output voltage, and n is transformer voltage ratio, and Lr is resonant inductance value,
Cr is resonant capacitance value, and Lm is magnetizing inductance value, and f is working frequency,For resonant frequency,
Rg is output loading.
As can be seen from the above equation, in the case where input voltage and other circuit parameters are selected, the output of LLC series resonances
Voltage reduces with the raising of working frequency, its control the relation of frequency and output voltage gain as shown in figure 1, LLC connect it is humorous
Shake converter boost capability be it is limited, within the specific limits with working frequency reduction output voltage raise.More than this
Individual scope, on the contrary with working frequency reduce output voltage reduce, this do not meet circuit negative-feedback monotonicity requirement and in reality
It can not be used in the work of border.Meanwhile the decompression ability of LLC series resonances is also limited, although in theory with working frequency
Raising output voltage can be with continuous decrease, but consider the influence of actual circuit device high-frequency loss, circuit work frequency can not
Can be very high (typically up to 2 times or so of resonant frequency).Therefore, in certain operating frequency range, LLC series resonances electricity
The output voltage on road can not possibly drop to it is very low, particularly in the case of light load.In summary, although LLC resonant converter
With Sofe Switch is easily realized so as to improve the advantage of circuit efficiency, but one obviously weak tendency is only with frequency
Output voltage range is very narrow during the control mode of modulation, it is impossible to which applying is needing the occasion of wide range output.
On the other hand, no matter under underloading or fully loaded transportation condition, LLC circuits can be easily achieved primary side and open simultaneously
Close the zero current turning-on of pipe；Also, LLC circuits can realize the zero-current switching of secondary commutation diode, reduce reversely extensive
Multiple loss.These all substantially reduce the switching loss of switch element in circuit, therefore as Switching Power Supply more popular at present
Topological form.But LLC circuits are not a kind of symmetrical circuit topology forms, when energy opposite direction flows, its circuit characteristic
No longer be LLC resonance characteristics but deteriorate to LC resonance characteristics, working range during so as to greatly reduce reverse operation and
Exacerbate the difficulty that switching tube realizes Sofe Switch.Therefore, traditional LLC resonance circuits are not too much suitable for being operated in energy two-way
In the state of flowing.
The content of the invention
First purpose of the present utility model is to provide a kind of two-way stable and becomes the two-way full-bridge resonance DC/direct current to change jobs
Converter.
In order to realize the first purpose of the present utility model, the utility model provides a kind of two-way full-bridge resonance DC/direct current
Converter, it includes being sequentially connected the first filter circuit connect, the first full-bridge circuit, resonant transform circuit, the second full-bridge circuit
With the second filter circuit；
Two-way resonance translation circuit also includes control unit, control unit respectively with the first filter circuit, the second filtered electrical
Road electrically connects；
The advanced arm of first full-bridge circuit is made up of first switch pipe and second switch pipe, the drain electrode of first switch pipe and the
The source electrode connection of two switching tubes, the lagging leg of the first full-bridge circuit are made up of the 3rd switching tube and the 4th switching tube, the 3rd switch
The drain electrode of pipe is connected with the source electrode of the 4th switching tube, first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube
Grid is connected with control unit respectively；
The advanced arm of second full-bridge circuit is made up of the 5th switching tube and the 6th switching tube, the drain electrode of the 5th switching tube and the
The source electrode connection of six switching tubes, the lagging leg of the second full-bridge circuit are made up of the 7th switching tube and the 8th switching tube, the 7th switch
The drain electrode of pipe is connected with the source electrode of the 8th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube
Grid is connected with control unit respectively.
From such scheme, the switching tube of the full-bridge circuit by controlling both sides, full-bridge circuit can be made to have the initiative out
Pass pattern or diode mode, then can be by the first full-bridge circuit when energy flows to the second filter circuit from the first filter circuit
Have the initiative switching mode, and the demand transmitted according to energy carries out the regulation of switching frequency, phase or dutycycle, and complete by second
Bridge circuit is in diode mode so that the second full-bridge circuit uses as rectification circuit, then realizes the conversion of energy, and anti-
Xiang Shi, then pattern is exchanged to the purpose that two-way changing can be achieved so that circuit more possesses practicality.
Further scheme is that resonance circuit includes resonant inductance, resonant capacitance, the first energy storage inductor, the first blocking
Electric capacity, the second energy storage inductor and the second capacitance；The first end of resonant inductance, the first end of the first energy storage inductor are opened with first
The drain electrode electrical connection of pipe is closed, the first end of the second energy storage inductor, the first end of resonant capacitance and the drain electrode of the 5th switching tube are electrically connected
Connect, the second end of resonant inductance electrically connects with the second end of resonant capacitance, the second end and the first blocking electricity of the first energy storage inductor
The first end electrical connection of appearance, the second end of the second energy storage inductor electrically connect with the first end of the second capacitance, the first blocking electricity
The second end, the second end of the second capacitance, the drain electrode of the 3rd switching tube and the drain electrode of the 7th switching tube electrical connection held.
Therefore and in the first full-bridge circuit outlet side parallel connection energy storage inductor, it is achieved thereby that isolation is symmetrical two-way
LLC resonant transformations, while connected capacitance in energy storage inductor and winding outlet side, stored up when effectively prevent positive work
Transformer bias saturation when energy inductance and reverse operation so that circuit more has practicality.
Further scheme is that resonance circuit includes resonant inductance, resonant capacitance, the first energy storage inductor, the first blocking
Electric capacity, winding and the second capacitance；The first end of resonant inductance, the first end of the first energy storage inductor and the leakage of first switch pipe
Pole electrically connects, and the first end of resonant capacitance electrically connects with the first positive terminal of winding, the second end of resonant inductance and resonant capacitance
The electrical connection of the second end, the second end of the first energy storage inductor electrically connects with the first end of the first capacitance, the first capacitance
The second end, winding the first negative pole end and the 3rd switching tube drain electrode electrical connection, the first end and winding of the second capacitance
The electrical connection of the second positive terminal, the second end of the second capacitance electrically connects with the drain electrode of the 5th switching tube, and the second of winding is negative
Drain electrode extremely with the 7th switching tube electrically connects.
Further scheme is that resonance circuit also includes the second energy storage inductor, and the second energy storage inductor is being connected to first just
Extremely between the first negative pole end.
Therefore realize the symmetrical two-way LLC resonant transformations of isolation by adding winding, rise two DC ports electrically every
From effect, and winding is between the first energy storage inductor and the second full-bridge circuit, in addition to protecting the first energy storage electric simultaneously
Sense and transformer bias saturation, capacitance are connected on isolating transformer secondary.
Further scheme is, resonance circuit include resonant inductance, resonant capacitance, energy storage inductor, switch, winding and every
Straight electric capacity；The first end of resonant inductance, the first end of energy storage inductor electrically connect with the drain electrode of first switch pipe, and the of resonant capacitance
One end electrically connects with the first positive terminal of winding, and the second end of resonant inductance electrically connects with the second end of resonant capacitance, energy storage electricity
Second end of sense electrically connects with the first end switched, the leakage at the second end of switch, the first negative pole end of winding and the 3rd switching tube
Pole electrically connects, and the first end of capacitance electrically connects with the second positive terminal of winding, the second end of capacitance and the 5th switch
The drain electrode electrical connection of pipe, the second negative pole end of winding electrically connect with the drain electrode of the 7th switching tube.
Therefore under working condition from the first filter circuit to the second filter circuit that transmitted from of energy, roof-cut resistence will
Energy storage inductor departs from from circuit, under the working condition that energy transmits from the second filter circuit to the first filter circuit, closure
Switch, energy storage inductor is put into circuit, and when so having still ensured that transmitted in both directions energy, converter is all LLC resonance electricity
Road characteristic, while avoid excess loss caused by energy storage inductor when forward direction works.
Further scheme is that control unit includes control module and controller, and control module includes：
Adjustment control device, adjustment control device receive feedback signal and the preset signals of controller output, and feedback signal is to adopt
Obtained by the operating current of the first filter circuit or the second filter circuit, adjustment control device is transported according to preset signals and feedback signal
Calculation draws control signal；
Phase operation circuit, phase operation circuit receive the control signal of adjustment control device output；
Frequency calculation circuit, frequency calculation circuit receive the control signal of adjustment control device output；
Pulse generating circuit, the frequency signal of pulse generating circuit receives frequency computing circuit output；
Phase-shift circuit, phase-shift circuit receive the reference pulse signal of pulse generating circuit output, phase-shift circuit receiving phase
The phase signal of computing circuit output；
Drive circuit, drive circuit receive the reference pulse signal of pulse generating circuit output, and drive circuit is according to benchmark
Pulse signal is driven to the advanced arm of the first full-bridge circuit, and drive circuit receives the phase-shift pulse letter of phase-shift circuit output
Number, drive circuit is driven according to phase-shift pulse signal to the lagging leg of the first full-bridge circuit.
Therefore pass through above-mentioned converter so that the driving pulse of two bridge arms is no longer that conventional full bridge resonance becomes
Q1 and Q3 phase fixed phase difference 180 degrees in parallel operation, but anaplasia of its phase difference at 180~0 degree is controlled by phase control unit
Change, in addition to adjusting output voltage by changing the switching frequency of full-bridge switch pipe using conventional full bridge controlled resonant converter, also
It is poor by the switch phase for changing above-mentioned two bridge arms of full-bridge so that the output voltage range of controlled resonant converter is significantly expanded
Exhibition.And the comparison using feedback signal and preset signals so that the control of corresponding voltage is more convenient and corresponding fast.
And output voltage is adjusted by the way of phase shifting control, each bridge arm of full-bridge resonant transform circuit two up and down
Switching tube still remains the characteristic of complementary conducting, and so as to two bridge arms, can be easily carried out no-voltage open-minded, is opening up
The advantage of circuit soft switch is remained while opening up output voltage range.
Brief description of the drawings
Fig. 1 is the graph of a relation for controlling frequency f and output voltage gain.
Fig. 2 is the system block diagram of the utility model full-bridge resonance DC/DC converter first embodiment.
Fig. 3 is the circuit diagram of output circuit in the utility model full-bridge resonance DC/DC converter first embodiment.
Fig. 4 is reference pulse signal and phase shift in the utility model full-bridge resonance DC/DC converter first embodiment
The oscillogram of pulse signal.
Fig. 5 is control signal and frequency, phase shift in the utility model full-bridge resonance DC/DC converter first embodiment
Graph of a relation between angle, output voltage.
Fig. 6 is the system block diagram of the two-way full-bridge resonance DC/DC converter first embodiment of the utility model.
Fig. 7 is the circuit diagram of the two-way full-bridge resonance DC/DC converter first embodiment of the utility model.
Fig. 8 is the circuit diagram of the two-way full-bridge resonance DC/DC converter second embodiment of the utility model.
Fig. 9 is the circuit diagram of the two-way full-bridge resonance DC/DC converter 3rd embodiment of the utility model.
Figure 10 is the circuit diagram of the two-way full-bridge resonance DC/DC converter fourth embodiment of the utility model.
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment
Full-bridge resonance DC/DC converter and its control method first embodiment：
Reference picture 2, full-bridge resonance DC/DC converter include output circuit and control module 20, and control module 20 is wrapped
Include adjustment control device 14, phase operation circuit 15, frequency calculation circuit 16, pulse generating circuit 17, phase-shift circuit 18 and driving
Circuit 19, output circuit include full-bridge circuit 11, resonance circuit 12 and the current rectifying and wave filtering circuit 13 being sequentially connected, full-bridge circuit 11
Receive input voltage and receive the switch control of drive circuit 19, the outside output services electric current of current rectifying and wave filtering circuit 13.
Reference picture 3, the advanced arm of full-bridge circuit are made up of first switch pipe Q1 and second switch pipe Q2, full-bridge circuit it is stagnant
Postbrachium is made up of the 3rd switching tube Q3 and the 4th switching tube Q4, and first switch pipe Q1 and the 3rd switching tube Q3 source electrode and positive pole are defeated
Enter end connection, second switch pipe Q2 and the 4th switching tube Q4 drain electrode are connected with negative input.First switch pipe Q1 leakage
Pole is connected with second switch pipe Q2 source electrode, and the 3rd switching tube Q3 drain electrode is connected with the 4th switching tube Q4 source electrode, and first opens
The grid for closing pipe Q1, second switch pipe Q2, the 3rd switching tube Q3 and the 4th switching tube Q4 is connected with drive circuit 19 respectively.
Resonance circuit 12 uses LLC resonance circuits in the present embodiment, and resonance circuit 12 includes inductance Lr, electric capacity Cr, electricity
Feel Lm and winding T1, inductance Lm is connected in parallel on winding T1 input, electric capacity Cr first end and winding T1 electrode input end
Connection, electric capacity Cr the second end are connected with inductance Lr first end, and inductance Lr the second end connects with first switch pipe Q1 drain electrode
Connect, winding T1 negative input is connected connection with the 3rd switching tube Q3 drain electrode.
Current rectifying and wave filtering circuit 13 includes rectification circuit and filter circuit, and filter circuit can be connected in parallel on output end using electric capacity Co
Form, rectification circuit can use the full-wave rectifying circuit or such as Fig. 3 (b) half-wave rectifying circuits as shown in Fig. 3 (a).Full-wave rectification
Circuit is connected and composed by four diodes D1, D2, D3 and D4, and half-wave rectifying circuit is made up of two diodes D1 and D2.
Illustrated with reference to the control method of converter and the structure of converter, can root when being controlled to converter
According to control purpose, preset signals, the work of the output of sampling harmonic DC to DC converter are exported to adjustment control device 4 first
Electric current then carries out negative-feedback computing as feedback signal, adjustment control device 4 according to feedback signal and preset signals, and union is drawn
Control signal.Subsequent adjustment control device 4 judges the magnitude relationship of preset signals and feedback signal, as feedback signal is more than default letter
Number, then the control signal Va to diminish is exported, phase operation circuit 15 receives and according to the control signal Va output phase shifting angles to diminish
The phase signal to diminish, frequency calculation circuit 16 receive and become big reference frequency according to the control signal Va output frequencies to diminish
Signal.
As feedback signal is less than preset signals, then output becomes big control signal Va, and phase operation circuit 15 receives and root
Become big phase signal according to big control signal Va output phase shifting angles are become, frequency calculation circuit 15 receives and according to the big control of change
The reference frequency signal that signal Va output frequencies diminish.
The reference frequency signal of the receives frequency computing circuit 16 of pulse generating circuit 17 output, the receiving phase of phase-shift circuit 18
The phase signal that computing circuit 15 exports, phase-shift circuit 18 receive the reference pulse signal that pulse generating circuit 17 exports and to them
Phase shift processing is carried out, drive circuit 19 receives the reference pulse signal that pulse generating circuit 17 exports, and drive circuit 19 is according to base
Quasi- pulse signal is driven to the Q1 and Q2 of the advanced arm of full-bridge circuit, and drive circuit 19 receives the shifting that phase-shift circuit 18 exports
Phase pulse signal, drive circuit 19 are driven according to phase-shift pulse signal to the Q3 and Q4 of the lagging leg of full-bridge circuit.
Reference picture 4 and Fig. 5, Fig. 4 are control signal Va and switching frequency f, phase shift in full-bridge resonance DC/DC converter
Angle Φ and output voltage Vout relation schematic diagram, it can be operated as follows：
Set threshold value a, threshold value b, threshold value c and threshold value d, threshold value a, threshold value b, threshold value c and threshold value d incremented by successively first,
When control signal Va is more than threshold value a and is less than threshold value b, frequency is controlled not to be changed into preset maximum value f=fmax, two
The phase shifting angle Φ of bridge arm gradually increases from zero changes to Φ 0, and corresponding output voltage Vout is also stepped up to V1 from zero, this
Process is independent phase shifting control pattern.
When control signal Va is more than or equal to threshold value b and is less than or equal to threshold value c, control frequency f and phase shifting angle Φ changes simultaneously,
The phase shifting angle of two bridge arms continues increase from Φ 0 and tapers to 180 °, and control frequency is tapered into f0 from fmax, accordingly
Output voltage Vout also further rises to V2 from V1, and this process is that VFC coordinates phase shifting control pattern.
When control signal Va is more than threshold value c and is less than threshold value d, phase shifting angle is not changed into Φ=180 °.Control frequency f from f0 by
Gradually it is reduced to preset minimum fmin, corresponding output voltage Vout and is also stepped up to V3 again from V2, this process is only
Vertical VFC pattern.
From said process as can be seen that big with the change of control signal, the output voltage of controlled resonant converter also gradually rises,
With diminishing for control signal, the output voltage of controlled resonant converter is gradually lowered, therefore can realize closed-loop control, reaches steady
Determine the purpose of output voltage or output current.
Full-bridge resonance DC/DC converter and its control method second embodiment：
Full-bridge resonance DC/DC converter in second embodiment includes output circuit and control module, wherein, output
Circuit can then use the output circuit in first embodiment, and control module then uses the MCU with operational capability, is stored with accordingly
The memory of software algorithm and the digital driver circuitry of cooperation, control module include adjustment control module, phase operation module,
Frequency calculation module, pulse generating module, phase shift block and drive module, adjustment control module receive preset signals and feedback letter
Number, adjustment control module draws control signal according to preset signals and feedback signal computing, and phase operation module receives regulation control
The control signal of device output processed, frequency calculation module receive the control signal of adjustment control device output, and pulse generating module receives
The frequency signal of frequency calculation module output, phase shift block receive the reference pulse signal of pulse generating module output, phase shift mould
The phase signal of block receiving phase computing module output, drive module receive the reference pulse signal of pulse generating module output,
Drive module is driven according to reference pulse signal to the advanced arm of full-bridge modules, and drive module receives phase shift block output
Phase-shift pulse signal, drive module are driven according to phase-shift pulse signal to the lagging leg of full-bridge modules.
The control method second embodiment of full-bridge resonance DC/DC converter can then perform above-mentioned control method in the same manner
The same steps of first embodiment, its Method And Principle are identicals.Second embodiment simply integrates control module with fortune
In control system or the control chip of calculating storage capacity, and first embodiment is to carry out each functional module using circuit module
Connect work.
Two-way full-bridge resonance DC/DC converter first embodiment：
Reference picture 6, Fig. 6 are the system block diagrams of two-way full-bridge resonance DC/DC converter.Two-way full-bridge resonance DC/
DC converter is complete including being sequentially connected the first filter circuit 31 connect, the first full-bridge circuit 32, resonant transform circuit 33, second
The filter circuit 35 of bridge circuit 34 and second, reference picture 7, Fig. 7 are the circuit diagrams of foregoing circuit, and the first filter circuit 31 includes electric capacity
Cd1, the second filter circuit 35 include electric capacity Cd2, and electric capacity Cd1 is connected between the first DC port Vd1 both positive and negative polarity, electric capacity
Cd2 is connected between the second DC port Vd2 both positive and negative polarity.
The advanced arm of first full-bridge circuit 32 is made up of switching tube Q1 and switching tube Q2, switching tube Q1 drain electrode and switching tube
Q2 source electrode connection, the lagging leg of the first full-bridge circuit 32 is made up of switching tube Q3 and switching tube Q4, switching tube Q3 drain electrode with
Switching tube Q4 source electrode connection, switching tube Q1, switching tube Q2, switching tube Q3 and switching tube Q4 grid connect with control unit respectively
Connect.
The advanced arm of second full-bridge circuit is made up of switching tube Q5 and switching tube Q6, switching tube Q5 drain electrode and switching tube Q6
Source electrode connection, the lagging leg of the second full-bridge circuit is made up of switching tube Q7 and switching tube Q8, switching tube Q7 drain electrode and switch
Pipe Q8 source electrode connection, switching tube Q5, switching tube Q6, switching tube Q7 and switching tube Q8 grid are connected with control unit respectively.
Resonance circuit 33 uses LLC resonant transform circuits, and resonance circuit 33 includes resonant inductance Lr, resonant capacitance Cr, storage
Can inductance Lm1, capacitance Cg1, energy storage inductor Lm2 and capacitance Cg2；Resonant inductance Lr first end, energy storage inductor Lm1
First end electrically connected with switching tube Q1 drain electrode, energy storage inductor Lm2 first end, resonant capacitance Cr first end and switching tube
Q5 drain electrode electrical connection, resonant inductance Lr the second end electrically connect with resonant capacitance Cr the second end, and the second of energy storage inductor Lm1
End electrically connects with capacitance Cg1 first end, and energy storage inductor Lm2 the second end electrically connects with capacitance Cg2 first end,
Capacitance Cg1 the second end, capacitance Cg2 the second end, switching tube Q3 drain electrode and switching tube Q7 drain electrode electrical connection.
Converter also includes control unit, and control unit includes control module 41, control module 42 and controller 43, control
Module 41 and control module 42 can use the control unit 20 in above-described embodiment, by with storage capacity and data processing energy
The microcomputer of power is controlled as controller 43 to control module 41 and control module 42, control module 41 and the electricity of filter circuit 31
Connect and gather the first DC port Vd1 circuit to obtain feedback signal, control module 42 electrically connects simultaneously with filter circuit 32
The second DC port Vd2 circuit is gathered to obtain feedback signal.The drive circuit of control module 41 is carried out to full-bridge circuit 32
Driving, the drive circuit of control module 42 are driven to full-bridge circuit 34.
Control unit can also be integrated in control system or control core with computing storage capacity by certain the present embodiment
In piece, it is also that full-bridge circuit and converter etc. integrally can be controlled.
Two-way full-bridge resonance DC/DC converter second embodiment：
Reference picture 8, second embodiment are improved to resonance circuit 53, specifically, resonance circuit include resonant inductance Lr,
Resonant capacitance Cr, energy storage inductor Lm1, capacitance Cg1, winding T1, energy storage inductor Lm2 and capacitance Cg2, resonant inductance Lr
First end, energy storage inductor Lm1 first end electrically connected with switching tube Q1 drain electrode, resonant capacitance Cr first end and winding T1
The electrical connection of the first positive terminal, resonant inductance Lr the second end electrically connects with resonant capacitance Cr the second end, energy storage inductor Lm1's
Second end electrically connects with capacitance Cg1 first end, capacitance Cg1 the second end, winding T1 the first negative pole end and opens
Pipe Q3 drain electrode electrical connection is closed, capacitance Cg2 first end electrically connects with winding T1 the second positive terminal, capacitance Cg2
The second end electrically connected with switching tube Q5 drain electrode, winding T1 the second negative pole end electrically connects with switching tube Q7 drain electrode, energy storage
Inductance Lm2 is connected between the first positive terminal and the first negative pole end.
Two-way full-bridge resonance DC/DC converter 3rd embodiment：
Reference picture 9,3rd embodiment are improved to resonance circuit 63, and specifically, the energy storage inductor Lm1 of upper embodiment can
It has been integrated into isolating transformer T1 connected in parallel, therefore has been no longer present in the circuit of 3rd embodiment as magnetizing inductance.
The control method first embodiment of two-way full-bridge resonance DC/DC converter：
Based on the converter of above-mentioned one to three embodiment, and the control method of full-bridge resonance DC/DC converter, this pair
Converter is realized to the control unit of full-bridge resonance DC/DC converter and controlled, its control method includes：
When energy conversion direction is to flow to the second filter circuit from the first filter circuit, the first flow direction conversion step is performed
Suddenly, i.e., energy from the first DC port Vd1 flow to the second DC port Vd2 when；
First, which flows to shift step, includes：
Control module 41 receives the first preset signals and the first feedback signal, and the first feedback signal is using the second filtered electrical
Obtained by the operating current on road, the first preset signals are exported by controller；
Control module 41 draws the first control signal, control module 41 according to the first preset signals and feedback signal computing
The first rectification control signal is drawn according to the first preset signals computing；
Control module 41 generates the first reference pulse signal and the first phase-shift pulse signal, control according to the first control signal
Module 41 is driven to the advanced arm of full-bridge circuit 32 according to the first reference pulse signal, and control module 41 is to full-bridge circuit 32
Lagging leg be driven according to the first phase-shift pulse signal so that full-bridge circuit 32 is i.e. such as active switch pattern, according to energy
The regulation for needing switching frequency, phase or dutycycle as early as possible of transmission；
Control module 42 is driven according to the first rectification control signal to full-bridge circuit 34 so that full-bridge circuit 34 is opened
Close pipe and enter diode mode, its equivalent circuit such as Fig. 3 (a) rectification circuit, that is, having electric current to flow counterflow through switching tube just can quilt
Dynamic conducting.
When energy conversion direction is to flow to the first filter circuit from the second filter circuit, the second flow direction conversion step is performed
Suddenly, i.e., energy from the second DC port Vd2 flow to the first DC port Vd1 when；
Second, which flows to shift step, includes：
Control module 42 receives the second preset signals and the second feedback signal, and the second feedback signal is using the first filtered electrical
Obtained by the operating current on road, the first preset signals are exported by controller；
Control module 42 draws the second control signal, control module 42 according to the second preset signals and feedback signal computing
The second rectification control signal is drawn according to the second preset signals computing；
Control module 42 generates the second reference pulse signal and the second phase-shift pulse signal, control according to the second control signal
Module 42 is driven to the advanced arm of full-bridge circuit 34 according to the second reference pulse signal, and control module 42 is to full-bridge circuit 34
Lagging leg be driven according to the second phase-shift pulse signal；
Control module 41 is driven according to the second rectification control signal to full-bridge circuit 32 so that full-bridge circuit 32 is opened
Close pipe and enter diode mode, full bridge rectifier can be equivalent to, that is, having electric current to flow counterflow through switching tube just can passively turn on..
Two-way full-bridge resonance DC/DC converter fourth embodiment：
Reference picture 10, is improved based on 3rd embodiment, and substantially circuit structure is identical with 3rd embodiment, difference
It is, resonance circuit 73 is connected to energy storage inductor Lm1 and opened without capacitance Cg1 using switch S1, switch S1
Between the drain electrode for closing pipe Q3, switch S1 can use the switch of electronic form or mechanical type, and switch S1 reception control units are led to
Disconnected control.
The control method second embodiment of two-way full-bridge resonance DC/DC converter：
Based on the control method first embodiment of two-way full-bridge resonance DC/DC converter, second embodiment adds
For the rate-determining steps of switch, it is specially：
After control unit receives the first preset signals and the first feedback signal, first, which flows to shift step, also includes control
Unit processed is according to the first preset signals blocking swtich；
After control unit receives the second preset signals and the second feedback signal, second, which flows to shift step, also includes control
Unit processed is turned on according to the second preset signals and switched.
Under the working condition that energy transmits from filter circuit 31 to filter circuit 35, roof-cut resistence, by energy storage inductor from electricity
Depart from road, under the working condition that energy transmits from filter circuit 35 to filter circuit 31, closure switch, energy storage inductor is thrown
Enter into circuit, when so having still ensured that transmitted in both directions energy, converter is all LLC resonance circuit characteristics, is avoided simultaneously
Excess loss caused by energy storage inductor during forward direction work.
The utility model is described by above example, and those skilled in the art knows, is not departing from this reality
In the case of new spirit and scope, equivalence replacement or change can be carried out to these features.Therefore, the utility model not by
The limitation of embodiment disclosed above, it is new that the embodiment fallen with the range of the utility model claims belongs to this practicality
The scope of type protection.
Claims (6)
- A kind of 1. two-way full-bridge resonance DC/DC converter, it is characterised in that：Including being sequentially connected the first filtered electrical connect Road, the first full-bridge circuit, resonant transform circuit, the second full-bridge circuit and the second filter circuit；The two-way resonance translation circuit also includes control unit, described control unit respectively with first filter circuit, institute State the electrical connection of the second filter circuit；The advanced arm of first full-bridge circuit is made up of first switch pipe and second switch pipe, the drain electrode of the first switch pipe It is connected with the source electrode of the second switch pipe, the lagging leg of first full-bridge circuit is by the 3rd switching tube and the 4th switching tube structure Into the drain electrode of the 3rd switching tube is connected with the source electrode of the 4th switching tube, the first switch pipe, the second switch The grid of pipe, the 3rd switching tube and the 4th switching tube is connected with described control unit respectively；The advanced arm of second full-bridge circuit is made up of the 5th switching tube and the 6th switching tube, the drain electrode of the 5th switching tube It is connected with the source electrode of the 6th switching tube, the lagging leg of second full-bridge circuit is by the 7th switching tube and the 8th switching tube structure Into the drain electrode of the 7th switching tube is connected with the source electrode of the 8th switching tube, the 5th switching tube, the 6th switch The grid of pipe, the 7th switching tube and the 8th switching tube is connected with described control unit respectively.
- 2. converter according to claim 1, it is characterised in that：The resonance circuit includes resonant inductance, resonant capacitance, the first energy storage inductor, the first capacitance, the second energy storage inductor With the second capacitance；The first end of the resonant inductance, the first end of first energy storage inductor and the drain electrode of the first switch pipe are electrically connected Connecing, the first end of second energy storage inductor, the first end of the resonant capacitance electrically connect with the drain electrode of the 5th switching tube, Second end of the resonant inductance electrically connects with the second end of the resonant capacitance, the second end of first energy storage inductor and institute State the first end electrical connection of the first capacitance, the second end of second energy storage inductor and the first of second capacitance End electrical connection, the second end of the first capacitance, the second end of the second capacitance, the drain electrode of the 3rd switching tube and described The drain electrode electrical connection of 7th switching tube.
- 3. converter according to claim 1, it is characterised in that：The resonance circuit include resonant inductance, resonant capacitance, the first energy storage inductor, the first capacitance, winding and second every Straight electric capacity；The first end of the resonant inductance, the first end of first energy storage inductor and the drain electrode of the first switch pipe are electrically connected Connect, the first end of the resonant capacitance electrically connects with the first positive terminal of the winding, the second end of the resonant inductance and institute State the second end electrical connection of resonant capacitance, the second end of first energy storage inductor and the first end electricity of first capacitance Connection, the drain electrode at the second end of first capacitance, the first negative pole end of the winding and the 3rd switching tube are electrically connected Connecing, the first end of second capacitance electrically connects with the second positive terminal of the winding, and the of second capacitance Two ends electrically connect with the drain electrode of the 5th switching tube, the drain electrode electricity of the second negative pole end of the winding and the 7th switching tube Connection.
- 4. converter according to claim 3, it is characterised in that：The resonance circuit also includes the second energy storage inductor, and second energy storage inductor is connected to first positive terminal and described Between first negative pole end.
- 5. converter according to claim 1, it is characterised in that：The resonance circuit includes resonant inductance, resonant capacitance, energy storage inductor, switch, winding and capacitance；The first end of the resonant inductance, the first end of the energy storage inductor electrically connect with the drain electrode of the first switch pipe, institute State the first end of resonant capacitance to electrically connect with the first positive terminal of the winding, the second end and the resonance of the resonant inductance The second end electrical connection of electric capacity, the second end of the energy storage inductor electrically connects with the first end of the switch, and the of the switch Two ends, the first negative pole end of the winding and the 3rd switching tube drain electrode electrical connection, the first end of the capacitance with The second positive terminal electrical connection of the winding, the second end of the capacitance electrically connect with the drain electrode of the 5th switching tube, Second negative pole end of the winding electrically connects with the drain electrode of the 7th switching tube.
- 6. according to the converter described in any one of claim 1 to 5, it is characterised in that：Described control unit includes control module and controller, and the control module includes：Adjustment control device, the adjustment control device receive feedback signal and the preset signals of controller output, the feedback Signal is obtained by the operating current using first filter circuit or second filter circuit, the adjustment control device according to The preset signals and the feedback signal computing draw control signal；Phase operation circuit, the phase operation circuit receive the control signal of the adjustment control device output；Frequency calculation circuit, the frequency calculation circuit receive the control signal of the adjustment control device output；Pulse generating circuit, the pulse generating circuit receive the frequency signal of the frequency calculation circuit output；Phase-shift circuit, the phase-shift circuit receive the reference pulse signal of the pulse generating circuit output, the phase-shift circuit Receive the phase signal of the phase operation circuit output；Drive circuit, the drive circuit receive the reference pulse signal of the pulse generating circuit output, the driving Circuit is driven according to the reference pulse signal to the advanced arm of first full-bridge circuit, and the drive circuit receives institute The phase-shift pulse signal of phase-shift circuit output is stated, the drive circuit is according to the phase-shift pulse signal to first full-bridge electricity The lagging leg on road is driven.
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| CN201720150001.3U CN206658155U (en) | 2017-02-17 | 2017-02-17 | A kind of two-way full-bridge resonance DC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720150001.3U CN206658155U (en) | 2017-02-17 | 2017-02-17 | A kind of two-way full-bridge resonance DC/DC converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138223A (en) * | 2019-05-13 | 2019-08-16 | 上海交通大学 | A kind of two-way DC/DC converter and its control method |
| CN110957923A (en) * | 2019-12-09 | 2020-04-03 | 深圳市优优绿能电气有限公司 | High-frequency isolation bidirectional direct current converter based on phase-shifted full bridge and grid-connected energy storage system |
| TWI720573B (en) * | 2019-08-07 | 2021-03-01 | 台達電子工業股份有限公司 | Power apparatus applied in sst structure and three-phase power source system having the same |
| US11515795B2 (en) | 2019-08-07 | 2022-11-29 | Delta Electronics, Inc. | Power apparatus applied in solid state transformer structure and three-phase power system having the same |
| WO2024031552A1 (en) * | 2022-08-11 | 2024-02-15 | 华为数字能源技术有限公司 | Direct-current converter, communication device and photovoltaic system |
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2017
- 2017-02-17 CN CN201720150001.3U patent/CN206658155U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138223A (en) * | 2019-05-13 | 2019-08-16 | 上海交通大学 | A kind of two-way DC/DC converter and its control method |
| CN110138223B (en) * | 2019-05-13 | 2020-03-10 | 上海交通大学 | Bidirectional DC/DC converter and control method thereof |
| TWI720573B (en) * | 2019-08-07 | 2021-03-01 | 台達電子工業股份有限公司 | Power apparatus applied in sst structure and three-phase power source system having the same |
| US11515795B2 (en) | 2019-08-07 | 2022-11-29 | Delta Electronics, Inc. | Power apparatus applied in solid state transformer structure and three-phase power system having the same |
| US11811327B2 (en) | 2019-08-07 | 2023-11-07 | Delta Electronics, Inc. | Power apparatus applied in solid state transformer structure and three-phase power system having the same |
| CN110957923A (en) * | 2019-12-09 | 2020-04-03 | 深圳市优优绿能电气有限公司 | High-frequency isolation bidirectional direct current converter based on phase-shifted full bridge and grid-connected energy storage system |
| WO2024031552A1 (en) * | 2022-08-11 | 2024-02-15 | 华为数字能源技术有限公司 | Direct-current converter, communication device and photovoltaic system |
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