CN207039461U - A kind of LLC resonance DCs converter and its control system - Google Patents
A kind of LLC resonance DCs converter and its control system Download PDFInfo
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- CN207039461U CN207039461U CN201720963904.3U CN201720963904U CN207039461U CN 207039461 U CN207039461 U CN 207039461U CN 201720963904 U CN201720963904 U CN 201720963904U CN 207039461 U CN207039461 U CN 207039461U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a kind of LLC resonance DCs converter and its control system, including current sampling circuit and control module.The electric current of LLC resonators when sampling bridge arm switch OFF by current sampling circuit.Control module is then according to the size of current of the LLC resonators, increase or reduction dead time, to reduce the switching loss of bridge arm switch.By adjusting the size of dead time, the switching loss of bridge arm switch is reduced, improves the whole efficiency of LLC resonance DC converters.
Description
Technical field
It the utility model is related to DC converter field, and in particular to a kind of LLC resonance DCs converter and its control system
System.
Background technology
With the development of New Energy Industry, the demand of charging pile industry increasingly increases, while will to charging pile power grade
To ask and increasingly improve, 10KW-20KW DC charging modules have begun to popularization and come, in present AC/DC DC Modules, DC/
DC uses three-level LLC more, and switch tube voltage stress can be reduced to input and survey dc bus by three-level LLC DC converter
(DC700V-850V) half, low-voltage device is chosen in the case of high input voltage, while LLC three-level resonant transformers can
The ZVS (ZVT) of switching tube is realized, and can realizes the ZCS (Zero Current Switch) of commutation diode, improves conversion efficiency,
Electromagnetic interference is reduced, but when resonance point voltage of the output voltage range less than design, exists in the shut-off of switching tube and compares
Big loss, because it is hard switching that switching tube, which is realized, during shut-off.
Therefore, prior art could be improved and improve.
Utility model content
The utility model mainly provides a kind of LLC resonance DCs converter and its control system, to reduce bridge arm switch
Switching loss.
The utility model provides a kind of control system of LLC resonance DCs converter, including：
The current sampling circuit of the electric current of LLC resonators during for sampling bridge arm switch OFF；
For the size of current according to the LLC resonators, increase or reduction dead time, to reduce opening for bridge arm switch
Close the control module of loss；
The input of current sampling circuit is connected with the LLC resonators of LLC resonance DC converters, current sampling circuit
The input of output end link control module, the control terminal of the output end connecting bridge arm switch of control module.
The control system of described LLC resonance DC converters, wherein, the control module includes：
Drive circuit for the turn-on and turn-off of drive axle arm switch；
For the current value of the LLC resonators and the size of pre-set current value；In the electric current of the LLC resonators
When value is more than pre-set current value, the 3rd dead time of the first dead time and/or increase is increased by drive circuit；Described
When the current value of LLC resonators is less than pre-set current value, the first dead time is reduced by drive circuit and/or reduction the 3rd is dead
The controller of area's time；
Wherein, the pre-set current value is not less than the minimum current value that can realize bridge arm switch ZVT；Described
One dead time is the dead time occurred for the first time in a work period, and the 3rd dead time is a work period
The dead time that middle third time occurs；
The input of controller is the input of control module, connects the output end of current sampling circuit；Controller it is defeated
Go out the input of end connection drive circuit；The output end of drive circuit be control module output end, the control of connecting bridge arm switch
End processed.
The control system of described LLC resonance DC converters, wherein, the LLC resonance DCs converter is three level
LLC resonance DC converters.
The control system of described LLC resonance DC converters, wherein, the current sampling circuit is specifically used for：One
After the individual work period starts, the electric current of LLC resonators when detecting the second bridge arm switch OFF；And/or detection the 3rd bridge arm switch
The electric current of LLC resonators during shut-off；Wherein, bridge in that of shut-off after during the second bridge arm switch switchs for two upper bridge arms
Arm switch, the 3rd bridge arm switch are the rear lower bridge arm switch of that turned off in two lower bridge arm switches.
The utility model provides a kind of LLC resonance DCs converter, including：
Switch bridge arm, including multiple bridge arms switch；
LLC resonators；
Transformer；
Rectification circuit；
The current sampling circuit of the electric current of LLC resonators during for sampling bridge arm switch OFF；
For the size of current according to the LLC resonators, increase or reduction dead time, to reduce opening for bridge arm switch
Close the control module of loss；
Switch the armature winding that bridge arm connects transformer by LLC resonators, the secondary windings connection rectified current of transformer
Road；The input of current sampling circuit is connected with LLC resonators, the input of the output end link control module of current sampling circuit
End, the output end connecting valve bridge arm of control module.
Described LLC resonance DC converters, wherein, the switch bridge arm, including the first bridge arm switch, the second bridge arm are opened
Close, the 3rd bridge arm switch and four bridge legs switch；First bridge arm switchs and the second bridge arm switch switchs for upper bridge arm, in a work
Make in the cycle, the switch evening shut-off of second the first bridge arm of bridge arm on-off ratio；3rd bridge arm switchs and four bridge legs switch is lower bridge arm
Switch, in a work period, the switch evening shut-off of the 3rd bridge arm on-off ratio four bridge legs.
Described LLC resonance DC converters, wherein, the current sampling circuit is specifically used for：In a work period
After beginning, the electric current of LLC resonators when detecting the second bridge arm switch OFF；And/or LLC during the 3rd bridge arm switch OFF of detection
The electric current of resonator.
Described LLC resonance DC converters, wherein, the control module includes：
For the drive circuit for the turn-on and turn-off for driving each bridge arm switch；
For the current value of the LLC resonators and the size of pre-set current value；In the electric current of the LLC resonators
When value is more than pre-set current value, the 3rd dead time of the first dead time and/or increase is increased by drive circuit；Described
When the current value of LLC resonators is less than pre-set current value, the first dead time is reduced by drive circuit and/or reduction the 3rd is dead
The controller of area's time；
Wherein, the pre-set current value, which is not less than, can realize that the second bridge arm switch or the 3rd bridge arm switch ZVT
Minimum current value；First dead time is to switch to close from the first bridge arm switch OFF to the second bridge arm in a work period
Disconnected time, the 3rd dead time are from four bridge legs switch OFF to the 3rd bridge arm switch OFF in a work period
Time；
The input of controller is the input of control module, connects the output end of current sampling circuit；Controller it is defeated
Go out the input of end connection drive circuit；The output end of drive circuit is the output end of control module, connects each bridge arm switch
Control terminal.
Described LLC resonance DC converters, wherein, the LLC resonance DCs converter is three-level LLC resonance DC
Converter.
Described LLC resonance DC converters, wherein, controller is more than default electricity in the current value of the LLC resonators
During flow valuve, the second dead time or the 4th dead time are reduced by drive circuit；Second dead time is from the second bridge
Arm switch turns off the time to the 3rd bridge arm switch conduction；4th dead time is from the 3rd bridge arm switch OFF to next
The time of second bridge arm switch conduction in work period.
LLC resonance DCs converter provided by the utility model and its control system, including current sampling circuit and control
Module.The electric current of LLC resonators when sampling bridge arm switch OFF by current sampling circuit.Control module is then according to the LLC
The size of current of resonator, increase or reduction dead time, to reduce the switching loss of bridge arm switch.By adjusting dead time
Size, reduce the switching loss of bridge arm switch, improve the whole efficiencies of LLC resonance DC converters.
Brief description of the drawings
Fig. 1 is the circuit diagram of LLC resonance DCs converter provided by the utility model；
Fig. 2 is in LLC resonance DCs converter provided by the utility model, and DC output circuit, switch bridge arm and LLC are humorous
Shake the circuit diagram of chamber；
Fig. 3 is in existing LLC resonance DCs converter, each bridge arm switch, LLC cavity currents and exciting current
Oscillogram；
Fig. 4 is the structured flowchart of controller in LLC resonance DCs converter provided by the utility model；
Fig. 5 is each bridge arm switch, LLC resonance in the embodiment of LLC resonance DCs converter one provided by the utility model
The oscillogram of cavity current and exciting current；
Fig. 6 is in another embodiment of LLC resonance DCs converter provided by the utility model, and each bridge arm switch, LLC are humorous
Shake the oscillogram of cavity current and exciting current.
Embodiment
The utility model is described in further detail below by embodiment combination accompanying drawing.It is wherein different to implement
Similar component employs associated similar element numbers in mode.In the following embodiments, many detailed descriptions are
In order that obtaining the application can be better understood.However, those skilled in the art can be without lifting an eyebrow recognize, which part
Feature is dispensed in varied situations, or can be substituted by other elements, material, method.In some cases,
The related certain operations of the application are not shown in the description or description, and this is the core in order to avoid the application
Flooded by excessive description, and to those skilled in the art, be described in detail these associative operations be not it is necessary,
They can completely understand associative operation at the general technology knowledge of description and this area in specification.
In addition, feature described in this description, operation or feature can combine to form respectively in any suitable way
Kind embodiment.Meanwhile each step in method description or action can also can be aobvious and easy according to those skilled in the art institute
The mode carry out order exchange or adjustment seen.Therefore, the various orders in specification and drawings are intended merely to clearly describe a certain
Individual embodiment, necessary order is not meant to be, wherein some sequentially must comply with unless otherwise indicated.
It is herein part institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any order or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
Referring to Fig. 1, the utility model provides a kind of LLC resonance DCs converter, including：DC output circuit 10, is opened
Close bridge arm 20, LLC resonant networks and power conversion circuit 30, rectification circuit 40 and control system (circuit) 50.The direct current
The output end of output circuit 10 connects LLC resonant networks and power conversion circuit 30 by switching bridge arm 20, LLC resonant networks and
The input of the output end connection rectification circuit 40 of power conversion circuit 30；Control system (circuit) 50 connects LLC resonant networks
And power conversion circuit 30.
The DC output circuit 10, for receiving the direct current of outside, export afterwards give switch bridge arm 20 after filtering, be
Total translation circuit provides power supply.The DC output circuit 10 includes the first electric capacity C1 ' and the second electric capacity C2 '.First electricity
Hold the positive pole of C1 ' one end connection direct current, the first electric capacity C1 ' other end passes through the negative of the second electric capacity C2 ' connection direct currents
Pole, the negative pole ground connection of the direct current.
The switch bridge arm 20, including multiple bridge arms switch.Each bridge arm switch can be single by single or multiple metal-oxide-semiconductors
Individual or multiple IGBT (insulated gate bipolar transistor), or metal-oxide-semiconductor and IGBT combination are formed.The switch bridge arm 20 plays
The effect of high frequency square wave generator, that is, it is used to produce high frequency square wave, DC voltage is become high frequency square wave voltage.
The LLC resonant networks and power conversion circuit 30, including LLC resonators (LLC resonance circuits) and power transformation
Device.The switch bridge arm 20 connects the armature winding of power transformer by LLC resonators, and the secondary windings of power transformer connects
Connect the input of rectification circuit 40.
Referring to Fig. 2, the LLC resonators include the first inductance Lr, the second inductance Lm and electric capacity Cr, i.e. the first inductance
Lr, the second inductance Lm and electric capacity Cr resonance circuits in series, its resonant frequency areThe LLC is humorous
The chamber that shakes make it that, when power supply is dc source, the electric current in LLC resonators sinusoidally changes.Because curtage is pressed
Sinusoidal rule changes, and zero crossing be present, if now switching device (bridge arm switch) is switched on or off, caused loss is just
Zero, while provide energy for circuit.Second inductance Lm is the magnetizing inductance of primary winding, and Ir is resonance electricity in circuit
Stream, Im are exciting current, and resistance Re is the equivalent load of circuit.
The rectification circuit 40, the alternating current for being exported to power transformer secondary windings carry out rectification；It is by commonly using
Full-bridge, all-wave, half-wave or other rectifier systems and filter circuit are formed.
The control system 50, it is the master control of the input/output state of whole DC converter, by controlling each bridge arm
Switch, and then control whole power transmission.
Further, the control system 50 includes current sampling circuit 510 and control module.
The current sampling circuit 510, the electric current of LLC resonators during for sampling bridge arm switch OFF.
The control module, for the size of current according to the LLC resonators, increase or reduction dead time, with drop
The switching loss of low bridge arm switch.
The input of current sampling circuit 510 is connected with LLC resonators, the output end connection control of current sampling circuit 510
The input of molding block, the output end connecting valve bridge arm 20 of control module.
The utility model reduces the switching loss of bridge arm switch, it is humorous to improve LLC by adjusting the size of dead time
Shake the whole efficiency of DC converter.
In the present embodiment, the LLC resonance DCs converter is three-level LLC resonance DC converter.
The switch bridge arm 20, including the first diode D1', the second diode D2', the first bridge arm switch Q1, the second bridge
Arm switch Q2, the 3rd bridge arm switch Q3 and four bridge legs switch Q4；It is upper bridge that first bridge arm, which switchs Q1 and the second bridge arm switch Q2,
Arm switch, in a work period, the second bridge arm switchs Q2 and switchs the late shut-offs of Q1 than the first bridge arm；3rd bridge arm switch Q3 and
Four bridge legs switch Q4 and switched for lower bridge arm, and in a work period, it is more late than four bridge legs switch Q4 that the 3rd bridge arm switchs Q3
Shut-off.The positive pole of the first pole connection direct current of the first bridge arm switch Q1, the second pole of the first bridge arm switch Q1 connect
Connect the second bridge arm switch Q2 the first pole and the first diode D1' negative pole, the control pole (grid of the first bridge arm switch Q1
Pole) link control module the first output end；First diode D1' positive pole connects the second diode D2' negative pole；Second bridge
Arm switch Q2 the second pole connects the first inductance Lr one end and the 3rd bridge arm switch Q3 the first pole；First inductance Lr's is another
The one end for the armature winding connection electric capacity Cr that end passes through transformer, electric capacity Cr the first electric capacity C1' of the other end connection other end,
The negative pole of first diode D1' positive pole and the second diode D2'；Second bridge arm switch Q2 control pole (grid) connection control
Second output end of module；3rd bridge arm switch Q3 the second pole connects the second diode D2' positive pole and four bridge legs switch
Q4 the first pole, the 3rd output end of the 3rd bridge arm switch Q3 control pole (grid) link control module；Four bridge legs switch
Q4 the second pole ground connection, the 4th output end of four bridge legs switch Q4 control pole (grid) link control module.
In the present embodiment, the first bridge arm switch Q1, the second bridge arm switch Q2, the 3rd bridge arm switch Q3 and four bridge legs switch
For four identical power MOS pipes.D1, D2, D3, D4 are the equivalent body diode of each corresponding power MOS pipe, C1, C2, C3,
C4 is equivalent output capacitance corresponding to each power MOS pipe.First diode D1' and the second diode D2' is three clampings
Diode.
Fig. 3 is four bridge arms switch, resonance current Ir and the exciting current of traditional three-level LLC resonance DC converter
Im oscillogram.When the working condition of resonance is less than switching frequency fo for resonant frequency fr, in this state, work as t0-t1
Q1 in period, Q2 are opened simultaneously, and the electric current Ir of resonator, Im increases, when in t1 moment, Q1 shut-offs.In the t1-t2 periods
Interior, Q1 shut-offs, Q2 is still open-minded, and now Ir electric current is begun to decline, and Im electric current still rises, and is closed when in t2 moment Q2
Disconnected, cut-off current now is ir, it can be seen that cut-off current now is still very big, and t1-t2 time zone is also referred to as dead band
Time 1；In t2-t3, Ir is equal with Im, simultaneously as t2 moment Q2 shut-off, causes Im to commutate, starts reversely to reduce, this
T2-t3 time interval is also referred to as dead time 2；T3 moment Q3, Q4 turn on, and then enter the lower half cycle, its work with it is upper
Half period is similar.Simultaneously in dead time 1, resonance current is charged to C1, and C4 is discharged.The resonance current in dead time 2
C1, C2 are charged simultaneously, C3, C4 electric discharge so that when t3 starts, Q3, the voltage of Q4MOS pipes is zero, and then realizes metal-oxide-semiconductor
ZVS (ZVT) is open-minded, and resonance current is begun through.It can thus be seen that Q1 turn off when cut-off current compare it is larger,
And the electric current ir flowed through during Q2 shut-offs, the shut-off of the two metal-oxide-semiconductors are hard switching shut-off, the loss of LLC resonators is increased.Together
When cut-off current now also determine and can realize that the ZVS of metal-oxide-semiconductor is open-minded.If electric current is too low, Ir can not be provided to upper bridge
Arm charges, and the energy needed for lower bridge arm electric discharge, does not realize ZVS so that the loss of whole system greatly increases.Fig. 3's is imitative
True waveform：Working frequency 150Khz, output 500V 20A, electric current is about 15A when Q2 is turned off.
And control system provided by the utility model, can be by detecting the real-time currents of LLC resonators, satisfaction can be real
Under the premise of existing power bridge arm switch ZVS electric currents, turned off in smaller electric current, and then reduce loss, improve efficiency.Together
When detect resonance current in real time, the state of DC converter can be monitored in real time, and then accomplish more to protect, the system of raising can
By property.Specifically, the current sampling circuit 510 is specifically used for：After a work period starts, detection the second bridge arm switch
The electric current of LLC resonators during shut-off；And/or detection the 3rd bridge arm switch OFF when LLC resonators electric current.Wherein, described
Bridge arm switchs in that of rear shut-off during two bridge arms switch Q2 switchs for two upper bridge arms, and the 3rd bridge arm switch Q3 is two
That lower bridge arm switch of shut-off after in lower bridge arm switch.In the present embodiment, that is, LLC resonance when detecting the second bridge arm switch OFF
The electric current of chamber, the electric current of LLC resonators when detecting the 3rd bridge arm switch OFF again.
The control module includes：Controller 520 and drive circuit 530.The input of controller 520 is control module
Input, connect the output end of current sampling circuit 510；The input of the output end connection drive circuit 530 of controller 520；
The output end of drive circuit 530 is the output end of control module, connects the control terminal of each bridge arm switch (Q1-Q4).
The drive circuit 530, for driving the turn-on and turn-off of each bridge arm switch (Q1-Q4).
The controller 520, for the current value of the LLC resonators and the size of pre-set current value；Described
When the current value of LLC resonators is more than pre-set current value, by drive circuit 530 drive corresponding to bridge arm switch conducting and/
Or turn off to increase the 3rd dead time of the first dead time and/or increase；It is less than in the current value of the LLC resonators default
During current value, by drive circuit drive corresponding to bridge arm switch conducting and/or shut-off with reduce the first dead time and/or
Reduce the 3rd dead time.
Referring to Fig. 4, the controller 520 includes analog-digital converter (AD) 521, comparator 522 and PWM controller 523.
The output end of the input connection current sampling circuit 510 of analog-digital converter 521, the output end of analog-digital converter 521 pass through ratio
Compared with the input that device 522 connects PWM controller 523, the input of the output end connection drive circuit 530 of PWM controller 523.
The analog-digital converter 521, believe for receiving the electric current of the sampling of current sampling circuit 510, and by the electric current of simulation
Number change into the current signal of numeral.
The comparator 522, for the current value of the LLC resonators and the size of pre-set current value, and it will compare
Relatively result is exported to PWM controller 523.
The PWM controller 523, for when the current value of the LLC resonators is more than pre-set current value, passing through driving
When circuit 530 drives conducting and/or the shut-off of corresponding bridge arm switch to increase three dead band of the first dead time and/or increase
Between；When the current value of the LLC resonators is less than pre-set current value, by drive circuit drive corresponding to bridge arm switch lead
Lead to and/or turn off to reduce the first dead time and/or reduce the 3rd dead time.Increase reduces the first dead time, tool
Body can be realized by adjusting Q1 and/or Q2 PWM duty cycle；Likewise, the 3rd dead time of increase or reduction, can specifically pass through
The PWM duty cycle for adjusting Q3 and/or Q4 is realized.In addition, in LLC resonance DC converters, each bridge arm in bridge arm 20 is switched
Switch as periodic duty, therefore increase or reduce the first dead time, the 3rd dead time, can increase or reduce to go out next time
Existing the first dead time, the 3rd dead time, can also increase or reduce subsequent one or in multiple work periods first
Dead time, the 3rd dead time.
Wherein, the pre-set current value, which is not less than, can realize that the second bridge arm switch Q2 or the 3rd bridge arm switch Q3 no-voltages are opened
The minimum current value of pass, so as to can also ensure the ZVS of bridge arm switch while switching loss is reduced.First dead time
For the dead time occurred for the first time in a work period, in other words, first dead time is to be opened from the first bridge arm
Time of the shut-off to the second bridge arm switch OFF.3rd dead time is dead to occur for the third time in a work period
Area's time, in other words, the 3rd dead time are from four bridge legs switch OFF to the 3rd bridge arm in a work period
The time of switch OFF.
Fig. 5 is to be switched using four bridge arms of the LLC resonance DC converters of control system provided by the utility model, be humorous
Shake electric current Ir and exciting current Im oscillogram.The work period is the work period T of switch bridge arm 20.When the work of resonance
When state is that resonant frequency fr is less than switching frequency fo, in this state, the controller 520 is controlled by drive circuit 530
Q1 and Q2 processed are opened simultaneously within the t0-t1 periods, and the electric current Ir of resonator, Im increases, when in t1 moment, Q1 shut-offs.
In the t1-t2 periods, Q1 shut-off, Q2 is still open-minded, and now Ir electric current is begun to decline, and Im electric current still rises, when
T2 moment Q2 is turned off, and the electric current of LLC resonators, big in the current value of LLC resonators when current sampling circuit 510 samples Q2 shut-offs
When pre-set current value, increase the first dead time (t1-t2 time interval) at the subsequent work cycle, in LLC resonators
Current value when being less than or equal to pre-set current value, reduce the first dead time at the subsequent work cycle.In t2-t3, Ir
It is equal with Im, simultaneously as t2 moment Q2 shut-off, causes Im to commutate, start reversely to reduce, this t2-t3 time interval is also referred to as
Make the second dead time.Control Q3 and Q4 to turn at the t3 moment, and then enter the lower half cycle, its work is similar with the upper half cycle.
Q4 is controlled to turn off at the t4 moment, t4-t5 time interval is the 3rd dead time.Q3 is controlled to turn off at the t5 moment, current sample
The electric current of LLC resonators when circuit 510 samples Q3 shut-offs, when the current value of LLC resonators is more than pre-set current value, next
Increase the 3rd dead time (t4-t5 time interval) during the work period, be less than or equal in the current value of LLC resonators default
During current value, reduce the 3rd dead time at the subsequent work cycle.T5 is to the time between the t0 moment in subsequent work cycle
Section is the 4th dead time.Because upper and lower bridge arm is symmetrical, thus in a work period can also only sampling a Q2 or Q3 turn off when
The electric current of LLC resonators, the first dead time and the 3rd dead time are increased in next work period.This implementation
In example, the first dead time and the increase of the 3rd dead time, the second dead time and the 4th dead time keep constant.
Preferably, the time of the first dead time and the increase of the 3rd dead time is 50ns.The controller 520 uses
Dsp controller, it is built-in with timer, electric current when being turned off by the interruption sampling Q2 and/or Q3 of timer.As shown in figure 5,
Working frequency 150Khz, output 500V 20A, electric current 5A when Q2 is turned off, compared to using the electric current in Fig. 3 of prior art, greatly
To reduce, turn-off power loss is greatly reduced.
It can be seen that the utility model adjusts electricity when Q2 and Q3 is turned off by detecting cavity current in real time, according to actual conditions
Flow valuve, the turn-off performance of the three-level LLC converter of optimization greatly reduces the switching loss of switching tube, while passes through optimization
First dead time, ensure that the second dead time is constant, also ensure that the ZVS functions of switching tube are realized, further Lifting Transform
The efficiency of device, the du/dt of the switching tube shut-off of reduction, advantageously reduces electromagnetic interference；Monitor resonant operational electric current in real time simultaneously
Change, therefore the protective effect such as the converter excessively stream that can be used for and overpower, improve the reliability of system.
Certainly, in other embodiments, the controller 520 is more than predetermined current in the current value of the LLC resonators
During value, the second dead time or the 4th dead time are also reduced by drive circuit 530, or be slightly reduced working frequency (i.e.
Slightly increase the work period).Second dead time be from the second bridge arm switch OFF to the 3rd bridge arm switch conduction when
Between；4th dead time be from the 3rd bridge arm switch OFF into the subsequent work cycle the second bridge arm switch conduction when
Between；Its corresponding oscillogram is as shown in Figure 6.
Use above specific case is illustrated to the utility model, is only intended to help and is understood the utility model, and
Not limiting the utility model., can be to above-mentioned according to thought of the present utility model for those of ordinary skill in the art
Embodiment is changed.
Claims (10)
- A kind of 1. control system of LLC resonance DCs converter, it is characterised in that including：The current sampling circuit of the electric current of LLC resonators during for sampling bridge arm switch OFF；For the size of current according to the LLC resonators, increase or reduction dead time, damaged with reducing the switch of bridge arm switch The control module of consumption；The input of current sampling circuit is connected with the LLC resonators of LLC resonance DC converters, the output of current sampling circuit Hold the input of link control module, the control terminal of the output end connecting bridge arm switch of control module.
- 2. the control system of LLC resonance DCs converter as claimed in claim 1, it is characterised in that the control module bag Include：Drive circuit for the turn-on and turn-off of drive axle arm switch；For the current value of the LLC resonators and the size of pre-set current value；It is big in the current value of the LLC resonators When pre-set current value, the 3rd dead time of the first dead time and/or increase is increased by drive circuit；It is humorous in the LLC When the current value of chamber of shaking is less than pre-set current value, when reducing the first dead time by drive circuit and/or reduce three dead bands Between controller；Wherein, the pre-set current value is not less than the minimum current value that can realize bridge arm switch ZVT；Described first is dead Area's time is the dead time occurred for the first time in work period, and the 3rd dead time is the in a work period The dead time occurred three times；The input of controller is the input of control module, connects the output end of current sampling circuit；The output end of controller Connect the input of drive circuit；The output end of drive circuit be control module output end, the control terminal of connecting bridge arm switch.
- 3. the control system of LLC resonance DCs converter as claimed in claim 2, it is characterised in that the LLC resonance DCs Converter is three-level LLC resonance DC converter.
- 4. the control system of LLC resonance DCs converter as claimed in claim 3, it is characterised in that the current sample electricity Road is specifically used for：After a work period starts, the electric current of LLC resonators when detecting the second bridge arm switch OFF；And/or The electric current of LLC resonators when detecting the 3rd bridge arm switch OFF；Wherein, the second bridge arm switch is in two upper bridge arm switch Bridge arm switchs in that turned off afterwards, and the 3rd bridge arm switch is opened for that lower bridge arm of rear shut-off in two lower bridge arm switches Close.
- A kind of 5. LLC resonance DCs converter, it is characterised in that including：Switch bridge arm, including multiple bridge arms switch；LLC resonators；Transformer；Rectification circuit；The current sampling circuit of the electric current of LLC resonators during for sampling bridge arm switch OFF；For the size of current according to the LLC resonators, increase or reduction dead time, damaged with reducing the switch of bridge arm switch The control module of consumption；Switch the armature winding that bridge arm connects transformer by LLC resonators, the secondary windings connection rectification circuit of transformer；Electricity The input of stream sample circuit is connected with LLC resonators, the input of the output end link control module of current sampling circuit, control The output end connecting valve bridge arm of molding block.
- 6. LLC resonance DCs converter as claimed in claim 5, it is characterised in that the switch bridge arm, including the first bridge arm Switch, the second bridge arm switch, the 3rd bridge arm switch and four bridge legs switch；First bridge arm switchs and the second bridge arm switch is upper bridge Arm switch, in a work period, the switch evening shut-off of second the first bridge arm of bridge arm on-off ratio；3rd bridge arm switchs and the 4th bridge Arm switch switchs for lower bridge arm, in a work period, the switch evening shut-off of the 3rd bridge arm on-off ratio four bridge legs.
- 7. LLC resonance DCs converter as claimed in claim 6, it is characterised in that the current sampling circuit is specifically used for： After a work period starts, the electric current of LLC resonators when detecting the second bridge arm switch OFF；And/or the 3rd bridge arm of detection The electric current of LLC resonators during switch OFF.
- 8. LLC resonance DCs converter as claimed in claim 7, it is characterised in that the control module includes：For the drive circuit for the turn-on and turn-off for driving each bridge arm switch；For the current value of the LLC resonators and the size of pre-set current value；It is big in the current value of the LLC resonators When pre-set current value, the 3rd dead time of the first dead time and/or increase is increased by drive circuit；It is humorous in the LLC When the current value of chamber of shaking is less than pre-set current value, when reducing the first dead time by drive circuit and/or reduce three dead bands Between controller；Wherein, the pre-set current value is not less than the minimum that can realize the second bridge arm switch or the 3rd bridge arm switch ZVT Current value；First dead time is from the first bridge arm switch OFF to the second bridge arm switch OFF in a work period Time, the 3rd dead time be in work period from four bridge legs switch OFF to the 3rd bridge arm switch OFF when Between；The input of controller is the input of control module, connects the output end of current sampling circuit；The output end of controller Connect the input of drive circuit；The output end of drive circuit is the output end of control module, connects the control of each bridge arm switch End processed.
- 9. LLC resonance DCs converter as claimed in claim 8, it is characterised in that the LLC resonance DCs converter is three Level LLC resonance DC converter.
- 10. LLC resonance DCs converter as claimed in claim 8, it is characterised in that controller is in the LLC resonators When current value is more than pre-set current value, the second dead time or the 4th dead time are reduced by drive circuit；Described second is dead Area's time is the time from the second bridge arm switch OFF to the 3rd bridge arm switch conduction；4th dead time is from the 3rd bridge The time of arm switch shut-off second bridge arm switch conduction into the subsequent work cycle.
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| CN201720963904.3U CN207039461U (en) | 2017-08-03 | 2017-08-03 | A kind of LLC resonance DCs converter and its control system |
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| CN201720963904.3U CN207039461U (en) | 2017-08-03 | 2017-08-03 | A kind of LLC resonance DCs converter and its control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418433A (en) * | 2018-03-29 | 2018-08-17 | 深圳驿普乐氏科技有限公司 | A kind of LLC resonant converter and its control circuit, resonance current sample circuit |
| WO2019183880A1 (en) * | 2018-03-29 | 2019-10-03 | 深圳驿普乐氏科技有限公司 | Llc resonant converter as well as control circuit and resonant current sampling circuit thereof |
| WO2019218498A1 (en) * | 2018-05-18 | 2019-11-21 | 深圳驿普乐氏科技有限公司 | Wide-range output circuit for charging module of charging pile, and control method |
| CN111726009A (en) * | 2020-07-07 | 2020-09-29 | 科华恒盛股份有限公司 | LLC circuit DC gain control method and device |
| CN113258786A (en) * | 2021-06-11 | 2021-08-13 | 深圳市高斯宝电气技术有限公司 | Three-phase interleaved LLC resonant converter |
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2017
- 2017-08-03 CN CN201720963904.3U patent/CN207039461U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418433A (en) * | 2018-03-29 | 2018-08-17 | 深圳驿普乐氏科技有限公司 | A kind of LLC resonant converter and its control circuit, resonance current sample circuit |
| WO2019183880A1 (en) * | 2018-03-29 | 2019-10-03 | 深圳驿普乐氏科技有限公司 | Llc resonant converter as well as control circuit and resonant current sampling circuit thereof |
| WO2019218498A1 (en) * | 2018-05-18 | 2019-11-21 | 深圳驿普乐氏科技有限公司 | Wide-range output circuit for charging module of charging pile, and control method |
| CN111726009A (en) * | 2020-07-07 | 2020-09-29 | 科华恒盛股份有限公司 | LLC circuit DC gain control method and device |
| CN113258786A (en) * | 2021-06-11 | 2021-08-13 | 深圳市高斯宝电气技术有限公司 | Three-phase interleaved LLC resonant converter |
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