CN105958828A - DC-DC converting circuit - Google Patents
DC-DC converting circuit Download PDFInfo
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- CN105958828A CN105958828A CN201610290854.7A CN201610290854A CN105958828A CN 105958828 A CN105958828 A CN 105958828A CN 201610290854 A CN201610290854 A CN 201610290854A CN 105958828 A CN105958828 A CN 105958828A
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- negative terminal
- translation circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
- H02M3/3381—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement using a single commutation path
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the electric power electronic technical field, and discloses a DC-DC converting circuit which comprises N unit converting circuits, M inductance units, a circuit input positive terminal, a circuit input negative terminal, a circuit output positive terminal and a circuit output negative terminal. The input positive terminal of the first unit converting circuit is in connection with the circuit input positive terminal through an inductance unit, and is directly in connection with the circuit input positive terminal; the input negative terminal of a Kth unit converting circuit is in connection with the input positive terminal of a (K+1)th unit converting circuit through the inductance unit or is directly in connection with the input positive terminal of a (K+1)th unit converting circuit; K, M and N are all natural numbers, KN, and 1=M=(N+1). The input negative terminal of an Nth unit converting circuit is in connection with the circuit input negative terminal through the inductance unit or is directly in connection with the circuit input negative terminal; the outputs of the N unit converting circuits are in parallel connection or in series connection, and are in connection with the circuit output positive terminal and the circuit output negative terminal. The DC-DC converting circuit reduces the cost, eliminates or reduces common mode interference, realizes interleaving control, decrease input and output current ripples, and is in favor of reducing filters and implementation difficulty.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of DC-DC conversion circuit.
Background technology
Having a large amount of in commercial Application is that high voltage (about 200V～800V) becomes to width input and the upper limit
The demand changed, as be converted to 24V/12V output by the high voltage of power battery pack in electric automobile.If
Single-level circuit (such as active clamp forward) is used to carry out direct DC-DC conversion, although technology maturation,
Topological sum controls simple, uses number of devices also few simultaneously；But need to use special High-tension Switch Devices (as
The metal-oxide-semiconductor of 900～1200V), expensive；Simultaneously under wide input voltage, the efficiency of changer is not
High.Therefore, under requiring higher application, use the mode of two-dimensional transform to realize being better method.
Relatively common Two Stages mode has, and prime will input high pressure by circuit such as three level Buck/Boost
Be converted to medium voltage；Rear class passes through one-level DC-DC conversion circuit (such as three-level LLC circuit) again will
Medium voltage is converted to the output voltage needed.So, by the appropriate design of two-stage circuit, it is possible to use
The ordinary high pressure switching tube (about below 600V) that industry uses in a large number completes to input the conversion of high pressure, significantly
Reducing cost, the comparison simultaneously making the efficiency of front and back stages to design is high, thus promotes whole efficiency.
In Two Stages circuit, the tri-level circuit of prime selects have Boost circuit and Buck circuit etc.,
The DC-DC conversion circuit of rear class selects suitable circuit according to the output voltage of prime, for prime is
The situation (medium voltage is high pressure about about 800V) of Boost tri-level circuit, rear class can select three
The tri-level circuits such as level LLC circuit or three level conversion full-bridges, to avoid using 900～1200V
The switching tube of grade.When prime is Buck tri-level circuit, (medium voltage is high pressure about 400V
Left and right), then rear class can select the circuit such as LLC circuit or phase-shifting full-bridge.In prior art, common three
Level circuit or there is common mode disturbances problem, local needs high tension apparatus, or needs big striding capacitance
Decoupling and circuit control complexity, high to the voltage request of electronic device, it is achieved cost is high, and common mode disturbances is big.
Summary of the invention
The present invention provides a kind of DC-DC conversion circuit, solves DC-DC conversion circuit pair in prior art
The voltage request of electronic device is high, it is achieved cost is high, the technical problem that common mode disturbances is big.
It is an object of the invention to be achieved through the following technical solutions:
A kind of DC-DC conversion circuit, including: N number of unit translation circuit, M inductance unit, circuit
Input anode, circuit input negative terminal, circuit output plus terminal and circuit output negative terminal, described first module converts
The input anode of circuit by inductance unit or is directly connected with described circuit input anode, and described K is mono-
The input negative terminal of unit's translation circuit is by inductance unit or direct defeated with described K+1 unit translation circuit
Entering anode to connect, K, M and N are natural number, K ＜ N, 1≤M≤N+1, described N unit conversion electricity
The input negative terminal on road is by inductance unit or is directly connected with described circuit input negative terminal, N number of unit conversion electricity
The output on road is connected in parallel to each other or connects and export negative terminal with described circuit output plus terminal and described circuit and is connected；
Wherein, described unit translation circuit includes electrical switch, electric capacity, diode and sub-translation circuit, institute
State electric capacity and be connected across input anode and input negative terminal, the output of described sub-translation circuit of described sub-translation circuit
Anode is the output plus terminal of described unit translation circuit, and the output negative terminal of described sub-translation circuit is described unit
The output negative terminal of translation circuit, described electrical switch is connected across input anode and the institute of described unit translation circuit
State between the input negative terminal of unit translation circuit；
The anode of described diode is connected with the input negative terminal of described sub-translation circuit, the negative terminal of described diode
It is connected with the input negative terminal of described unit translation circuit, the input anode of described unit translation circuit and described son
The input anode of translation circuit connects, or, the negative terminal of described diode and the input of described sub-translation circuit
Anode connects, and the anode of described diode is connected with the input anode of described unit translation circuit, described unit
The input negative terminal of translation circuit is connected with the input negative terminal of described sub-translation circuit.
A kind of DC-DC conversion circuit provided by the present invention so that switching tube can all use commonly
Device, thus reduce cost, eliminate or reduce common mode disturbances problem, it is also possible to realize Interleaved control,
Reduce input and output current ripple, be conducive to reducing wave filter, reduce and realize difficulty.Meanwhile, by closing
Reason designs sub-translation circuit 1,2 ... n and output connected mode thereof, can make N number of unit conversion electricity
Road output voltage and output automatically achieve basis equalization.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
Some embodiments of the present invention, for those of ordinary skill in the art, are not paying creative work
On the premise of, other accompanying drawing also can be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the DC-DC conversion circuit in the embodiment of the present invention one；
Fig. 2 is the structural representation of the DC-DC conversion circuit in the embodiment of the present invention two；
Fig. 3 is the structural representation of the DC-DC conversion circuit in the embodiment of the present invention three；
Fig. 4 is the structural representation of the DC-DC conversion circuit in the embodiment of the present invention four；
Fig. 5 is the structural representation of the DC-DC conversion circuit in the embodiment of the present invention five；
Fig. 6 is the structural representation of the DC-DC conversion circuit in the embodiment of the present invention six.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the accompanying drawings and
The present invention is further detailed explanation for detailed description of the invention.
Embodiment one
As it is shown in figure 1, be a kind of DC-DC conversion circuit, including: N number of unit translation circuit, M
Inductance unit, circuit input anode, circuit input negative terminal, circuit output plus terminal and circuit output negative terminal, institute
The input anode stating first module translation circuit by inductance unit or directly connects with described circuit input anode
Connecing, the input negative terminal of described K unit translation circuit is by inductance unit or directly mono-with described K+1
The input anode of unit's translation circuit connects, and K, M and N are natural number, and K ＜ N, 1≤M≤N+1 are described
The input negative terminal of N unit translation circuit by inductance unit or is directly connected with described circuit input negative terminal,
The output of N number of unit translation circuit be connected in parallel to each other or connect and with described circuit output plus terminal and described circuit
Output negative terminal connects；
Wherein, described unit translation circuit includes electrical switch, electric capacity, diode and sub-translation circuit, institute
State electric capacity and be connected across input anode and input negative terminal, the output of described sub-translation circuit of described sub-translation circuit
Anode is the output plus terminal of described unit translation circuit, and the output negative terminal of described sub-translation circuit is described unit
The output negative terminal of translation circuit, described electrical switch is connected across input anode and the institute of described unit translation circuit
State between the input negative terminal of unit translation circuit；
The anode of described diode is connected with the input negative terminal of described sub-translation circuit, the negative terminal of described diode
It is connected with the input negative terminal of described unit translation circuit, the input anode of described unit translation circuit and described son
The input anode of translation circuit connects, or, the negative terminal of described diode and the input of described sub-translation circuit
Anode connects, and the anode of described diode is connected with the input anode of described unit translation circuit, described unit
The input negative terminal of translation circuit is connected with the input negative terminal of described sub-translation circuit.
Wherein, so that do not have high frequency voltage to shake between electric capacity and input, optimal elimination common mode is obtained
The effect of interference, the input anode of described first module translation circuit is directly connected to described circuit input anode,
The input negative terminal of described N unit translation circuit is directly connected to described circuit input negative terminal, correspondingly,
Described inductance unit number is M-2.
The output of described N number of unit translation circuit be connected in parallel to each other or connect and with described circuit output plus terminal and
Described circuit output negative terminal connects, and connected mode has multiple, specifically may include that
1, the output plus terminal of N number of unit translation circuit is connected with described circuit output plus terminal, and N number of unit becomes
The output negative terminal changing circuit is connected with described circuit output negative terminal；Or,
2, the output exporting negative terminal and described K+1 unit translation circuit of described K unit translation circuit
Anode connects；Or,
3, N number of unit translation circuit is divided into Q group, wherein, often the unit translation circuit outfan in group that
This is in parallel, and the output plus terminal of first group is connected with described circuit output plus terminal, the output negative terminal of P group and
The output plus terminal of P+1 group connects, and the output negative terminal of Q group is connected with described circuit output negative terminal, Q
It is natural number with P, 1≤P≤Q-1；Or,
4, N number of unit translation circuit is divided into for Q group, wherein, often first unit translation circuit in group
Output plus terminal is the output plus terminal of this group, and the output negative terminal of first unit translation circuit becomes with another unit
The output plus terminal changing circuit connects, and often the output negative terminal of last the unit translation circuit in group is this group
Output negative terminal, the output plus terminal of all groups is connected with described circuit output plus terminal, the output negative terminal of all groups and
Described circuit output negative terminal connects.
Described sub-translation circuit includes isolating DC-DC conversion circuit and non-isolated DC-DC conversion circuit,
Wherein, described isolation DC-DC conversion circuit is LLC resonance circuit or phase whole-bridging circuit, described non-every
It is Buck circuit or Boost circuit or Cuk circuit from DC-DC conversion circuit.Accordingly, this is a little
Electrical switch in translation circuit is controlled by staggered mode, and described staggered mode is the two-way in circuit
Or same frequency control signal more than two-way, every road control signal staggers the control mode of a phase bit successively, and one
In the case of as, the angle of staggered misphase is the most permissible from 0～360.Preferably control mode includes: when N is even number
Time, the Interleaved control misphase of the electrical switch in described isolation DC-DC conversion circuit is 180/N degree；When
When N is odd number, the Interleaved control misphase of the electrical switch in described isolation DC-DC conversion circuit is
2*180/N degree.
Electrical switch in described unit translation circuit can also be controlled by staggered mode, the most staggered
Control misphase and include 2*180/N degree.
Diode in described unit translation circuit is managed by single MOSFET or multiple MOSTSF manages also
Connection substitutes, and uses synchronous rectification mode to control.
In the circuit of the embodiment of the present invention, it is also possible to include N number of surge protection unit, described first module
Sub-translation circuit input negative terminal in translation circuit is connected with protected location anode, and protected location negative terminal is with described
Sub-translation circuit input anode in K unit translation circuit connects, in described K unit translation circuit
Sub-translation circuit input negative terminal be connected with the anode of another protected location, the negative terminal of another protected location and the
Sub-translation circuit input anode in N unit translation circuit connects.
Described surge protection unit is single diode or multiple diodes in parallel, and its anode is protected location
Anode, negative terminal is the negative terminal of protected location.Described surge protection unit is single electric capacity or the parallel connection of multiple electric capacity.
As the quantity of the inductance unit in Fig. 1 can be any number between 1～N+1, such as: work as electricity
Sense unit is when being 1, and other are all was that the place of inductance unit is and is directly connected to, according to permutation and combination originally
So combination has 2N+1Kind.Inductance unit can and be at least made up of an inductance；Inductance list in circuit
Unit is the position that can seal in inductance, it is also possible to does not seal in inductance unit and is directly connected to.From circuit, single
The steady state voltage that undertaken of electronic component in unit's translation circuit respectively by capacitor cell C1, C2 ... and
Voltage on Cn determines, owing to C1, C2 ... and Cn are that tandem has shared input voltage jointly,
Making its voltage keep substantial equilibrium by control, maximizing reduces the pressure of electronic component in circuit to be wanted simultaneously
Ask, so the electronic component in circuit can select the electronic component of relatively low pressure.For avoiding or reducing common mode
Interference problem, needs to reduce the high dither in circuit as far as possible, namely as far as possible in holding unit translation circuit
The level of capacitor cell C1, C2 ... and Cn does not has high dither relative to incoming level.As
Fruit connects the inductance unit of circuit input anode and is added without inductance and is directly connected to, then can just be inputted by circuit
One end of end and C1 links together, so that the level of C1 inputs relatively does not has high dither；As
Fruit connects the inductance unit of circuit input negative terminal and is added without inductance and is directly connected to, then can be by negative for circuit input
One end of end and Cn links together, so that the level of Cn inputs relatively does not has high dither.Cause
This, the present invention remove with circuit input positive and negative terminal connect inductance unit and be directly connected to so that C1 and
Cn does not all have high dither, thus eliminates common mode disturbances problem.
In control mode, when the driving of SW1, SW2 ... and SWn consistent (dutycycle and phase
Position is the same) when not interlocking, the voltage on inductance only has two states: switching tube SW1, SW2 ...
When simultaneously turning on SWn, inductive drop is input voltage vin/M；Switching tube SW1, SW2 ...
When simultaneously turning off with SWn, if the voltage on C1 is voltage VC2 ... on VC1, C2, V
Always=VC1+VC2+......+VCn, then inductive drop is (total-Vin of V)/M；And switch tube SW1,
When SW2 ... and SWn carry out Interleaved control, in addition to above two state, there is also most N-2 kind
State, i.e. in SW1, SW2 ... and SWn only one of which switching tube turn on other turn off, SW1,
SW2 ... and SWn there are 2 switching tubes to turn on other shutoffs ..., by that analogy, now electricity
Electrification pressure be up to N kind level, the electric current stricture of vagina that so will reduce on input current ripple and Boost inductance
Ripple, and frequency be noninterlace control time N times thus be conducive to reduction input filter realize difficulty.
Circuit of the present invention, needs VC1, VC2 ... and VCn voltage basically identical, if bias is too
Conference affects reliability；Can be reached by the driving dutycycle controlling SW1, SW2 ... and SWn
To voltage basis equalization；Can also be adjusted by regulating its load.
A kind of DC-DC conversion circuit provided by the present invention so that switching tube can all use commonly
Device, thus reduce cost, eliminate or reduce common mode disturbances problem, it is also possible to realize Interleaved control,
Reduce input and output current ripple, be conducive to reducing wave filter.Meanwhile, by appropriate design conversion electricity
Road 1,2 ... n and output connected mode thereof, can make output voltage and output automatically achieve base
This equilibrium.
Embodiment two
As in figure 2 it is shown, be the schematic diagram of second embodiment of the invention, unit translation circuit number N is 2, electricity
Feel one inductance unit of unit selection and be connected between first module circuit and second unit circuit, input
Anode directly connects with first module circuit on one side, and input negative terminal directly connects with second unit circuit on one side,
So that do not have high frequency voltage to shake between C1 and C2 and input, obtain optimal elimination common mode disturbances
Effect；Sub-translation circuit in first and second element circuit have chosen conventional half-bridge LLC circuit, and
And its outfan uses parallel；By half-bridge LLC voltage gain formula
Understanding, (resonator parameter Lr, Cr, Lm and transformator become except parameter designing to affect its voltage gain
Ratio n) outward, is mainly determined by operating frequency f and load Ro.Wherein, n is the transformer primary secondary turn ratio；
Fx is the ratio i.e. f/fr of LLC operating frequency f and resonant frequency fr, wherein,K is excitation
Inductance unit Lm and the ratio i.e. Lm/Lr of resonance inductance unit Lr；Q is that its computing formula of quality factor is as followsWherein, Ro is load, and Cr is resonant capacitance.
The impact on voltage of the dutycycle of SW1 and SW2 is analyzed, it is assumed that first below in conjunction with the present embodiment
The dutycycle of unit translation circuit SW1 is D1；The dutycycle of second unit translation circuit SW2 is D2,
Total output voltage be V total=VC1+VC2.The circuit of the present invention is divided into three kinds of states, i.e. 1) SW1
Simultaneously turn on two switching tubes of SW2；2) two switching tubes of SW1 and SW2 simultaneously turn off；3)SW1
With one conducting of two switching tubes of SW2, another turns off.When two-way drives not staggered and dutycycle
D=D1=D2, now have V total=Vin/ (1-D), and due to charging interval of electric capacity C1 and C2 and electric current
Being the same, therefore in the case of load is the same, the size of VC1 and VC2 is the most only and the capacity of electric capacity
Relevant；By analysis, also it is the same during Interleaved control.Therefore, at the first and second unit translation circuits
SW1 with SW2 dutycycle is the same and load the same in the case of, the size of VC1 and VC2 is the most only and electric
The capacity held is relevant (when capacity is consistent, VC1 with VC2 is the same).When hardware parameter and be loaded with difference
Time, VC1 and VC2 will produce difference, now can make VC1 and VC2 by regulation dutycycle
Reach voltage basis equalization.Assuming that D1-D2=Δ D, as Δ D ＞ 0, Δ D during this period of time in, SW1
Conducting makes C1 to charge, so that its charging interval compares VC2 less than C2, its voltage VC1
To decline.Therefore, as VC1 ＞ VC2, Δ D can be increased, otherwise as VC1 ＞ VC2, permissible
Reduce Δ D (Δ D ＜ 0), so can carry out voltage balance control.
Load also has appreciable impact to VC1 and VC2, it is assumed that the equivalence of first module translation circuit
Load is Z1 for the equiva lent impedance after R1, and electric capacity C1 parallel connection；The equivalent negative of second unit translation circuit
Equiva lent impedance after carrying as R2, and electric capacity C2 parallel connection is Z2.Due to first and second liang of unit translation circuit
Being series characteristic, in the case of dutycycle is the same, the electric current flowing through Z1 with Z2 is the same (being set to i),
Then VC1=i × Z1, VC2=i × Z2；Therefore, subtract accordingly when R1 reduces (i.e. power P 1 increases) then Z1
Little, VC1 can be made to tend to reduce；Otherwise R1 increases (P1 reduction) then Z1 and increases accordingly, can make
Obtain VC1 to tend to increase；Also it is same trend to second unit translation circuit.Utilize circuit of the present invention
This characteristic, when VC1 or VC2 voltage being raised by design rear class DCDC circuit, its merit
Rate increases, so that VC1 and VC2, P1 and P2 are automatically held in equilbrium position.A kind of simple
Method can reach such effect, the i.e. output of first module translation circuit and second unit translation circuit also
Connection, so balances due to P1 and P2, can also play the effect of current balance simultaneously.Need to say especially
Bright, VC1 and VC2, P1 and P2 are automatically held in equilbrium position and do not imply that voltage and power one
Sample, because its equilbrium position is relevant with the voltage gain of sub-translation circuit 1 and 2, it is assumed that sub-translation circuit 1
Voltage gain be M1, the voltage gain of sub-translation circuit 2 is M2, and output voltage is Vo, when first
During the output-parallel of unit translation circuit and second unit translation circuit, then VC1=M1 × Vo,
VC2=M2 × Vo；P1=VC1 × i=M1 × Vo × i, P2=VC2 × i=M2 × Vo × i, as M1=M2 or
When person M1 and M2 is more or less the same, then VC1 and VC2, PA and PB can reach basis equalization.
From Such analysis, M1=M2 or M1 of group translation circuit (such as half-bridge LLC circuit)
When being more or less the same with M2, then VC1 and VC2, P1 and P2 can reach basis equalization.If design
The parameter of two groups of sub-translation circuits is the same, i.e. resonant parameter Lr, Cr, Lm is the same with transformer voltage ratio n,
And allow them be operated in identical operating frequency f, then their voltage gain M1 with M2 will be the same
Or closely (deviation of its deviation only parameter causes), therefore the design of first embodiment can be real
Existing VC1 and VC2 automatic equalization, first module circuit and the automatic current equalizing of second unit circuit.Meanwhile,
SW1 and SW2 and sub-translation circuit 1,2 separately or concurrently can be carried out Interleaved control, reduce input,
Output ripple.
Embodiment three
As it is shown on figure 3, be the schematic diagram of third embodiment of the invention, circuit sense circuit group number N is 2, electricity
Sense one inductance unit of unit selection and being connected between input anode and first module circuit, first and
Second unit circuit is directly connected, and input negative terminal and second unit circuit on one side are directly connected to.First and second is single
Sub-translation circuit in unit's circuit have chosen conventional half-bridge LLC circuit equally, and its outfan uses
Parallel.So, C2 voltage inputs relatively does not has high dither, but C1 voltage inputs relatively
Having high dither, therefore for common mode disturbances problem, this embodiment simply reduces common mode disturbances, and relative
One embodiment is the scheme of suboptimum.The same with first embodiment, this embodiment can realize VC1 and VC2
Automatic equalization, first module circuit and the automatic current equalizing of second unit circuit；To SW1 and SW2 and son
Translation circuit 1,2 separately or concurrently carries out Interleaved control, can reduce input, output ripple.
Embodiment four
As shown in Figure 4, for the schematic diagram of fourth embodiment of the invention, its input connected mode and first is implemented
Example is the same, to obtain optimum common mode disturbances eradicating efficacy；Sub-translation circuit in first and second element circuit
Have chosen conventional half-bridge LLC circuit equally, but it is output as series system, it is possible to obtain be higher defeated
Go out voltage.VC1 and VC2 is controlled by controlling the difference Δ D of the dutycycle of SW1 and SW2, thus real
The equilibrium of existing first and second element circuit output voltage, under output series system, the electric current of two-way output is one
Sample, the power equilibrium of such two-way output.
Embodiment five
As it is shown in figure 5, be the schematic diagram of fifth embodiment of the invention, its input and output connected mode and first
Embodiment is just the same, but the sub-translation circuit in its first module circuit have chosen phase whole-bridging circuit.Move
The voltage gain of phase full-bridge circuit is
In the case of dutycycle is the same or close, even if considering the situation of duty-cycle loss, it is also possible to obtain
Basically identical voltage gain, therefore can realize VC1 and VC2 automatic equalization, first module circuit and
The automatic current equalizing of second unit circuit.Meanwhile, can to SW1 and SW2 and sub-translation circuit respectively or
Carry out Interleaved control simultaneously, reduce input, output ripple.
Embodiment six
As shown in Figure 6, for second reality of the schematic diagram of sixth embodiment of the invention, its main circuit and the present invention
Execute example identical, but further comprises surge protection unit, by device or the circuit structure with voltage clamp effect
Become, by voltage clamp thus voltage in limiting circuit or shunting surge current, reach in protection circuit
The purpose of device, in the present embodiment, surge protection unit is diode D3.When the input of circuit is unexpected
Pour in surge voltage, when surge voltage is higher than voltage sum on C1 and C2, surge protection unit action,
Diode D3 turns on, and surge current can directly flow through surge protection cell diodes D3, thus protect electricity
Other semiconductor device in road, from big inrush current shock, play a protective role.
Above the present invention is described in detail, former to the present invention of specific case used herein
Reason and embodiment are set forth, and the explanation of above example is only intended to help to understand the present invention's
Method and core concept thereof；Simultaneously for one of ordinary skill in the art, according to the think of of the present invention
Think, the most all will change, in sum, this specification
Content should not be construed as limitation of the present invention.
Claims (15)
1. a DC-DC conversion circuit, it is characterised in that including: N number of unit translation circuit, M
Individual inductance unit, circuit input anode, circuit input negative terminal, circuit output plus terminal and circuit output negative terminal,
The input anode of described first module translation circuit by inductance unit or directly inputs anode with described circuit
Connecting, the input negative terminal of described K unit translation circuit is by inductance unit or direct and described K+1
The input anode of unit translation circuit connects, and K, M and N are natural number, K ＜ N, 1≤M≤N+1, institute
The input negative terminal stating N unit translation circuit by inductance unit or directly connects with described circuit input negative terminal
Connect, the output of N number of unit translation circuit be connected in parallel to each other or connect and with described circuit output plus terminal and described electricity
Road output negative terminal connects；
Wherein, described unit translation circuit includes electrical switch, electric capacity, diode and sub-translation circuit, institute
State electric capacity and be connected across input anode and input negative terminal, the output of described sub-translation circuit of described sub-translation circuit
Anode is the output plus terminal of described unit translation circuit, and the output negative terminal of described sub-translation circuit is described unit
The output negative terminal of translation circuit, described electrical switch is connected across input anode and the institute of described unit translation circuit
State between the input negative terminal of unit translation circuit；
The anode of described diode is connected with the input negative terminal of described sub-translation circuit, the negative terminal of described diode
It is connected with the input negative terminal of described unit translation circuit, the input anode of described unit translation circuit and described son
The input anode of translation circuit connects, or, the negative terminal of described diode and the input of described sub-translation circuit
Anode connects, and the anode of described diode is connected with the input anode of described unit translation circuit, described unit
The input negative terminal of translation circuit is connected with the input negative terminal of described sub-translation circuit.
DC-DC conversion circuit the most according to claim 1, it is characterised in that described first is single
The input anode of unit's translation circuit is directly connected to described circuit input anode, described N unit conversion electricity
The input negative terminal on road is directly connected to described circuit input negative terminal, and described inductance unit number is M-2.
DC-DC conversion circuit the most according to claim 2, it is characterised in that including: work as N
When being 2, the input anode of described first module translation circuit is connected with described circuit input anode, and input is negative
End is connected by the input anode of inductance unit with described second unit translation circuit, and described second unit converts
The input negative terminal of circuit is connected with described circuit input negative terminal, and the output of two unit translation circuits is connected in parallel to each other
Or connect and be connected with described circuit output plus terminal and described circuit output negative terminal；
Wherein, described unit translation circuit includes electrical switch, electric capacity, diode and sub-translation circuit, institute
State electric capacity and be connected across input anode and input negative terminal, the output of described sub-translation circuit of described sub-translation circuit
Anode is the output plus terminal of described unit translation circuit, and the output negative terminal of described sub-translation circuit is described unit
The output negative terminal of translation circuit, described electrical switch is connected across input anode and the institute of described unit translation circuit
State between the input negative terminal of unit translation circuit；
The anode of described first module translation circuit diode is connected with the input negative terminal of described sub-translation circuit,
The negative terminal of described diode is connected with the input negative terminal of described unit translation circuit, described unit translation circuit
Input anode is connected with the input anode of described sub-translation circuit, described second unit translation circuit diode
Negative terminal is connected with the input anode of described sub-translation circuit, the anode of described diode and described unit conversion electricity
The input anode on road connects, and the input negative terminal of described unit translation circuit is born with the input of described sub-translation circuit
End connects.
4. according to the DC-DC conversion circuit described in claim 1 or 2 or 3, it is characterised in that institute
State the output of N number of unit translation circuit be connected in parallel to each other or connect and with described circuit output plus terminal and described electricity
Road output negative terminal connects, including:
The output plus terminal of N number of unit translation circuit is connected with described circuit output plus terminal, N number of unit conversion electricity
The output negative terminal on road is connected with described circuit output negative terminal；Or,
The output negative terminal of described K unit translation circuit is with the output of described K+1 unit translation circuit just
End connects；Or,
N number of unit translation circuit is divided into Q group, and wherein, often the unit translation circuit outfan in group is each other
Parallel connection, the output plus terminal of first group is connected with described circuit output plus terminal, the output negative terminal of P group and
The output plus terminal of P+1 group connects, and the output negative terminal of Q group exports negative terminal with described circuit and is connected, Q with
P is natural number, 1≤P≤Q-1；Or,
N number of unit translation circuit is divided into for Q group, and wherein, often first unit translation circuit in group is defeated
Going out the output plus terminal that anode is this group, the output negative terminal of first unit translation circuit converts with another unit
The output plus terminal of circuit connects, and often the output negative terminal of last the unit translation circuit in group is the defeated of this group
Going out negative terminal, the output plus terminal of all groups is connected with described circuit output plus terminal, the output negative terminal of all groups and institute
State circuit output negative terminal to connect.
5. according to the DC-DC conversion circuit described in claim 1 or 2 or 3, it is characterised in that institute
State sub-translation circuit for isolation DC-DC conversion circuit.
The most according to claim 5, it is characterised in that described isolation DC-DC conversion circuit is LLC
Resonance circuit or phase whole-bridging circuit.
The most according to claim 6, it is characterised in that in described isolation DC-DC conversion circuit
Electrical switch is controlled by staggered mode.
The most according to claim 7, it is characterised in that when N is even number, described isolation DC-DC
The Interleaved control misphase of the electrical switch in translation circuit is 180/N degree；When N is odd number, described every
The Interleaved control misphase of the electrical switch in DC-DC conversion circuit is 2*180/N degree.
9. according to the DC-DC conversion circuit described in claim 1 or 2 or 3, it is characterised in that institute
Stating sub-translation circuit is Buck circuit or Boost circuit or Cuk circuit.
10. according to the DC-DC conversion circuit described in claim 1 or 2 or 3, it is characterised in that institute
The electrical switch stated in unit translation circuit is controlled by staggered mode.
11. according to claim 10, it is characterised in that the electronic cutting in described unit translation circuit
The Interleaved control misphase closed is 2*180/N degree.
12. according to the DC-DC conversion circuit described in claim 1 or 2 or 3, it is characterised in that institute
State the diode in unit translation circuit to be managed by single MOSFET or multiple MOSTSF pipe parallel connection is carried out
Substitute, and use synchronous rectification mode to control.
13. according to the DC-DC conversion circuit described in claim 1 or 2 or 3, it is characterised in that in institute
State and circuit also includes N number of surge protection unit, the sub-translation circuit in described first module translation circuit
Input negative terminal is connected with protected location anode, in protected location negative terminal and described K unit translation circuit
Sub-translation circuit input anode connects, the sub-translation circuit input negative terminal in described K unit translation circuit
It is connected with the anode of another protected location, in the negative terminal of another protected location and N unit translation circuit
Sub-translation circuit input anode connects.
14. DC-DC conversion circuit according to claim 13, it is characterised in that described surge
Protected location is single diode or multiple diodes in parallel, and its anode is the anode of protected location, and negative terminal is
The negative terminal of protected location.
15. DC-DC conversion circuit according to claim 13, it is characterised in that described surge
Protected location is single electric capacity or the parallel connection of multiple electric capacity.
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| CN201610290854.7A CN105958828B (en) | 2016-04-22 | 2016-04-22 | DC-DC conversion circuit |
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| CN201610290854.7A CN105958828B (en) | 2016-04-22 | 2016-04-22 | DC-DC conversion circuit |
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| CN107359803A (en) * | 2017-08-31 | 2017-11-17 | 南京理工大学 | Positive activation type high-frequency isolation three-level inverter |
| CN107395014A (en) * | 2017-08-04 | 2017-11-24 | 华为技术有限公司 | Power supply circuit, electronic building brick, mobile phone terminal and method for controlling power supply |
| CN107947587A (en) * | 2017-11-10 | 2018-04-20 | 漳州科华技术有限责任公司 | A kind of high-efficiency constant-flow Width funtion output circuit |
| WO2018107506A1 (en) * | 2016-12-17 | 2018-06-21 | 中天海洋系统有限公司 | Direct-current to direct-current conversion device |
| CN110138214A (en) * | 2019-05-08 | 2019-08-16 | 浙江大学 | Eliminate the modularization DC-DC converter control unit of circuit certainly based on distributed ripple |
| CN111525804A (en) * | 2019-02-03 | 2020-08-11 | 台达电子工业股份有限公司 | DC/DC conversion system |
| CN111654183A (en) * | 2020-06-12 | 2020-09-11 | 深圳英飞源技术有限公司 | DC-DC conversion device and control method thereof |
| CN111934555A (en) * | 2020-08-18 | 2020-11-13 | 国网湖南省电力有限公司 | LLC resonant circuit, control method and LLC resonant converter |
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| CN106230261A (en) * | 2016-09-23 | 2016-12-14 | 江苏由甲申田新能源科技有限公司 | A kind of DC DC two-stage pressure-regulating module-cascade circuit |
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| CN107359803A (en) * | 2017-08-31 | 2017-11-17 | 南京理工大学 | Positive activation type high-frequency isolation three-level inverter |
| CN107359803B (en) * | 2017-08-31 | 2019-09-13 | 南京理工大学 | Positive activation type high-frequency isolation three-level inverter |
| CN107947587B (en) * | 2017-11-10 | 2019-12-20 | 漳州科华技术有限责任公司 | High-efficient constant current wide voltage output circuit |
| CN107947587A (en) * | 2017-11-10 | 2018-04-20 | 漳州科华技术有限责任公司 | A kind of high-efficiency constant-flow Width funtion output circuit |
| CN111525804A (en) * | 2019-02-03 | 2020-08-11 | 台达电子工业股份有限公司 | DC/DC conversion system |
| US11121627B2 (en) | 2019-02-03 | 2021-09-14 | Delta Electronics, Inc. | DC/DC conversion system |
| CN111525804B (en) * | 2019-02-03 | 2021-10-08 | 台达电子工业股份有限公司 | DC/DC conversion system |
| CN113839561A (en) * | 2019-02-03 | 2021-12-24 | 台达电子工业股份有限公司 | DC/DC conversion system |
| CN110138214A (en) * | 2019-05-08 | 2019-08-16 | 浙江大学 | Eliminate the modularization DC-DC converter control unit of circuit certainly based on distributed ripple |
| CN111654183A (en) * | 2020-06-12 | 2020-09-11 | 深圳英飞源技术有限公司 | DC-DC conversion device and control method thereof |
| CN111654183B (en) * | 2020-06-12 | 2021-10-29 | 深圳英飞源技术有限公司 | DC-DC conversion device and control method thereof |
| CN111934555A (en) * | 2020-08-18 | 2020-11-13 | 国网湖南省电力有限公司 | LLC resonant circuit, control method and LLC resonant converter |
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