CN103683940B - A kind of DC-DC transfer circuit, device and method of work - Google Patents
A kind of DC-DC transfer circuit, device and method of work Download PDFInfo
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- CN103683940B CN103683940B CN201310686958.6A CN201310686958A CN103683940B CN 103683940 B CN103683940 B CN 103683940B CN 201310686958 A CN201310686958 A CN 201310686958A CN 103683940 B CN103683940 B CN 103683940B
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Abstract
Embodiments provide a kind of DC translation circuit, device and method of work, relate to circuit field, for reducing the volume of circuit so that circuit can simple realization, and reduce the cost of circuit.Described circuit, including: square wave generation circuit, for exporting the voltage of square-wave waveform；LLC resonance circuit, including: the resonant capacitance of series connection, the first resonant inductance and the second resonant inductance；Described LLC resonance circuit is coupled to described square wave generation circuit, for receiving the voltage of described square wave generation circuit output square-wave waveform, and output AC resonance potential on described second resonant inductance；Rectification circuit, is coupled to described second resonant inductance, for by the exchange resonance potential of described second resonant inductance output being carried out rectification and obtain commutating voltage, and is exported by described commutating voltage.The present invention is applicable to the scene of DC voltage conversion.
Description
Technical field
The present invention relates to circuit field, particularly relate to a kind of DC-DC transfer circuit, device and
Method of work.
Background technology
Currently, LLC resonance circuit is widely applied in DC-DC converter, concrete as
Shown in Fig. 1: the LLC resonance circuit of series connection is coupled to square wave generation circuit, and this LLC
Resonance circuit by the primary windings connected in series of resonant capacitance, resonant inductance and transformator, transformator
The exchange resonance potential that secondary windings output LLC resonance circuit generation resonance produces is to rectified current
Road, so that exchange resonance potential is carried out output extremely load after rectification by rectification circuit.Can manage
Solving, when switching frequency is near resonant frequency, DC-DC converter may be at soft
On off state, therefore, compared with traditional hard switching, decreases the loss of switch, also simultaneously
The sudden change of voltage x current and electromagnetic interference produced due to hard switching can be reduced.
But, inventor finds that in prior art, at least there are the following problems: when DC-to-dc becomes
When parallel operation need not use the isolated topology with transformer apparatus, in side circuit, if adopting
Realize DC-DC transfer circuit with transformer apparatus, then can cause the increase of circuit volume,
Realizing of circuit is more complicated, and adds the cost of circuit.
Summary of the invention
Embodiments of the invention provide a kind of DC-DC transfer circuit, device and method of work,
The volume of circuit can be reduced so that circuit can simple realization, and reduce the cost of circuit.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
First aspect, embodiments provides a kind of DC-DC transfer circuit, including:
Square wave generation circuit, for exporting the voltage of square-wave waveform；LLC resonance circuit, including: string
Resonant capacitance, the first resonant inductance and second resonant inductance of connection；Described LLC resonance circuit coupling
It is connected to described square wave generation circuit, for receiving described square wave generation circuit output square-wave waveform
Voltage, and output AC resonance potential on described second resonant inductance；Rectification circuit, coupling
It is connected to described second resonant inductance, for by by humorous for the exchange of described second resonant inductance output
The voltage that shakes carries out rectification and obtains commutating voltage, and is exported by described commutating voltage.
In the first possible implementation of first aspect, described square wave generation circuit bag
Include described square wave generation circuit and include direct voltage source and bridge circuit, wherein, described bridge-type electricity
Road is coupled to described direct voltage source, described bridge circuit include series connection the first switch element and
Second switch unit, is carried out alternately by described first switch element and described second switch unit
Connection and disconnect respectively at described first switch element and the two ends of described second switch unit
Produce described square-wave waveform voltage.
In conjunction with the first possible implementation of first aspect, at the second of first aspect
In possible implementation, described first switch element includes first diode and first of parallel connection
Switching device；Described second switch unit includes the second diode and the second switch device of parallel connection
Part；Described bridge circuit is coupled to described direct voltage source and includes: bearing of described first diode
Pole is connected with the positive pole of described direct voltage source；The positive pole of described first diode and described second
The negative pole of diode connects；The positive pole of described second diode and the negative pole of described direct voltage source
Connect.
In conjunction with the first possible implementation of first aspect, at the third of first aspect
In possible implementation, described first switching device includes metal-oxide layer-quasiconductor-field effect
Transistor (MOSFET)；And/or described second switch device includes metal-oxide layer-partly lead
Body-field-effect transistor.
In conjunction with first aspect, or the first of the first aspect realization that any one is possible to the third
Mode, in the 4th kind of possible implementation of first aspect, described rectification circuit includes
First electric capacity, the second electric capacity, the 3rd diode and the 4th diode, wherein, the described 3rd 2
The positive pole of pole pipe is connected with the negative pole of described 4th diode, the negative pole of described 3rd diode
It is connected with one end of described second electric capacity, the positive pole of described 4th diode and described second electricity
The other end held is connected, and one end of described first electric capacity connects with the negative pole of described 4th diode
Connect, one end of the other end described second resonant inductance of connection of described first electric capacity, the described 4th
The positive pole of diode connects the other end of described second resonant inductance, and described second electric capacity two ends are defeated
Go out described commutating voltage.
In conjunction with first aspect, or the first of the first aspect realization that any one is possible to the third
Mode, in the 5th kind of possible implementation of first aspect, described rectification circuit includes
First electric capacity, the second electric capacity, the 3rd diode and the 4th diode, wherein, the described 3rd 2
The negative pole of pole pipe is connected with the positive pole of described 4th diode, the positive pole of described 3rd diode
It is connected with one end of described second electric capacity, the negative pole of described 4th diode and described second electricity
The other end held is connected, and one end of described first electric capacity connects with the positive pole of described 4th diode
Connect, one end of the other end described second resonant inductance of connection of described first electric capacity, the described 4th
The negative pole of diode connects the other end of described second resonant inductance, and described second electric capacity two ends are defeated
Go out described commutating voltage.
In conjunction with first aspect, or the first of the first aspect realization that any one is possible to the third
Mode, in the 6th kind of possible implementation of first aspect, described rectification circuit includes
First electric capacity, the second electric capacity, the 3rd electric capacity, the 3rd diode and the 4th diode, wherein,
The positive pole of described 3rd diode is connected with the negative pole of described 4th diode, and the described 3rd 2
Level the negative pole of pipe be connected with one end of described second electric capacity, the positive pole of described 4th diode and
The other end of described second electric capacity is connected, one end of described first electric capacity and described four or two pole
The negative pole of pipe connects, and the other end of described first electric capacity connects the one of described second resonant inductance
End, the other end of described second resonant inductance of one end connection of described 3rd electric capacity, the described 3rd
The other end of electric capacity connects the positive pole of described 4th diode, described second electric capacity two ends output institute
State commutating voltage.
Second aspect, embodiments provides the method for work of a kind of circuit, described method
It is applied to include square wave generation circuit, LLC resonance circuit and the DC-dc conversion of rectification circuit
Circuit, wherein, described LLC resonance circuit is coupled to described square wave generation circuit, and includes:
Resonant capacitance, the first resonant inductance and second resonant inductance of series connection；Described rectification circuit couples
In described second resonant inductance, described method includes: described square wave generation circuit output square wave ripple
The voltage of shape；Described LLC resonance circuit receives described square wave generation circuit output square-wave waveform
Voltage；Described LLC resonance circuit is output AC resonance potential on described second resonant inductance；
Described rectification circuit is by carrying out rectification by the exchange resonance potential of described second resonant inductance output
Obtain commutating voltage；Described commutating voltage is exported by described rectification circuit.
The third aspect, embodiments provides a kind of electronic installation, including such as first aspect
Described DC-DC transfer circuit, power supply and load；Described power supply is for institute
State DC-DC transfer circuit to power；Described DC-DC transfer circuit is for described load
Power supply.
Embodiments provide a kind of DC-DC transfer circuit, device and method of work,
DC-DC transfer circuit includes: square wave generation circuit, LLC resonance circuit and rectification circuit,
Wherein, LLC resonance circuit includes resonant capacitance, the first resonant inductance and second resonance of series connection
Inductance, will replace with the second resonant inductance by the transformator in LLC resonance circuit in prior art,
So, square wave generation circuit is received at the LLC resonance circuit being coupled to square wave generation circuit defeated
When going out the voltage of square-wave waveform, can on the second resonant inductance output AC resonance potential, and
Exchange resonance potential is carried out rectification by rectification circuit, and then obtains commutating voltage, and by whole
Stream voltage output extremely load, and without adding transformer apparatus on DC-DC transfer circuit,
Thus when realizing DC-dc conversion, reduce the volume of DC-DC transfer circuit, make
Circuit can simple realization, and reduce the cost of circuit.
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
The accompanying drawing used required in embodiment or description of the prior art will be briefly described, aobvious and
Easily insight, the accompanying drawing in describing below is only some embodiments of the present invention, for this area
From the point of view of those of ordinary skill, on the premise of not paying creative work, it is also possible to according to these
Accompanying drawing obtains other accompanying drawing.
Fig. 1 is the DC-DC transfer circuit schematic diagram of prior art；
The schematic diagram of a kind of DC-DC transfer circuit that Fig. 2 provides for the embodiment of the present invention；
The schematic diagram of a kind of square wave generation circuit that Fig. 3 provides for the embodiment of the present invention；
A kind of schematic diagram realizing switch element that Fig. 4 provides for the embodiment of the present invention；
The schematic diagram of a kind of rectification circuit that Fig. 5 provides for the embodiment of the present invention；
The schematic diagram of the another kind of rectification circuit that Fig. 6 provides for the embodiment of the present invention；
The schematic diagram of the another kind of rectification circuit that Fig. 7 provides for the embodiment of the present invention；
The example signal of a kind of DC-DC transfer circuit that Fig. 8 provides for the embodiment of the present invention
Figure；
Fig. 9 shows for the example of the another kind of DC-DC transfer circuit that the embodiment of the present invention provides
It is intended to；
Figure 10 shows for the example of the another kind of DC-DC transfer circuit that the embodiment of the present invention provides
It is intended to；
The workflow schematic diagram of the method for a kind of circuit that Figure 11 provides for the embodiment of the present invention；
The square-wave waveform that a kind of square wave generation circuit that Figure 12 provides for the embodiment of the present invention produces
Instance graph；
The structural representation of a kind of electronic installation that Figure 13 provides for the embodiment of the present invention；
The structural representation of the another kind of electronic installation that Figure 14 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical side in the embodiment of the present invention
Case is clearly and completely described, it is clear that described embodiment is only the present invention one
Divide embodiment rather than whole embodiments.Based on the embodiment in the present invention, this area is general
The every other embodiment that logical technical staff is obtained under not making creative work premise,
Broadly fall into the scope of protection of the invention.
Embodiments provide a kind of DC-DC transfer circuit, as in figure 2 it is shown, include:
Square wave generation circuit 201, LLC resonance circuit 202 and rectification circuit 203.
Wherein, square wave generation circuit 201, for exporting the voltage of square-wave waveform.
LLC resonance circuit 202, including: resonant capacitance 2021, first resonant inductance of series connection
2022 and second resonant inductance 2023.
Concrete, one end of the first resonant inductance 2022 is connected to one end of resonant capacitance 2021,
One end of second resonant inductance 2023 is connected to the other end of resonant capacitance 2021, the second resonance
The other end of inductance 2023 is straight with the negative pole of direct voltage source 2011 in square wave generation circuit 201
Connect in succession.Or,
One end of first resonant inductance 2022 is connected to one end of resonant capacitance 2021, and second is humorous
Shake one end of inductance 2023 is connected to the other end of resonant capacitance 2021, the second resonant inductance
The other end of 2023 directly connects with the positive pole of direct voltage source 2011 in square wave generation circuit 201
Connect.
As long as it should be noted that can guarantee that rectification circuit 203 is coupled to the second resonant inductance
Resonant capacitance the 2021, first resonant inductance 2022 and of series connection in 2023, LLC resonance circuits
The connected mode of the second resonant inductance 2023, it is also possible to be other connected mode, the present invention couple
This does not limits.
LLC resonance circuit 202 is coupled to square wave generation circuit 201, is used for receiving square wave and produces
Circuit 201 exports the voltage of square-wave waveform, and output AC on the second resonant inductance 2023
Resonance potential.
Rectification circuit 203, is coupled to the second resonant inductance 2023, for by by the second resonance
The exchange resonance potential of inductance 2023 output carries out rectification and obtains commutating voltage, and by rectified current
Pressure exports.
Concrete, that the second resonant inductance 2023 is exported by rectification circuit 203 exchange resonance potential
Carry out rectification, will second resonant inductance 2023 output exchange resonance potential be converted into unidirectional current
Pressure, is commutating voltage, and the commutating voltage output after converting is to load.
So, the square-wave waveform voltage input LLC resonance electricity that square wave generation circuit 201 will produce
Road 202, and then the second resonant inductance 2023 two ends generation in LLC resonance circuit 202
Exchange resonance potential, and this exchange resonance potential is inputted to rectification circuit 203, rectified electricity
After the rectification of road 203, exchange resonance potential is converted into DC voltage, further by this direct current
Voltage input is to load.
Further, described square wave generation circuit 201, as it is shown on figure 3, include DC voltage
Source 2011 and bridge circuit 2012.
Wherein, bridge circuit 2012 is coupled to described direct voltage source 2011, described bridge-type electricity
Road 2012 includes the first switch element 20121 and the second switch unit 20122 of series connection, logical
Cross described first switch element 20121 and described second switch unit 20122 carries out company alternately
On and off is opened respectively at described first switch element 20121 and described second switch unit 20122
Two ends produce described square-wave waveform voltage.
It should be noted that pre-set respective dutycycle for each switch element.
Concrete, each switch element can connect according to its respective dutycycle and disconnect,
And then generation square-wave waveform.
It should be noted that the first switch element 20121 and second switch unit 20122 are to hand over
The carrying out replaced connects and disconnects, i.e. when the first switch element 20121 connects, and second switch list
Unit 20122 is off, when the first switch element 20121 disconnects, and second switch list
Unit 20122 connection.
Further, as shown in Figure 4, described first switch element 20121 includes the of parallel connection
One diode 201211 and the first switching device 201212；Described second switch unit 20122 wraps
Include the second diode 201221 and the second switch device 201222 of parallel connection.
Wherein, the first diode 201211 is connected in parallel with the first switching device 201212, the
Two diodes 201221 are connected in parallel with second switch device 201222, the first switch element
20121 are connected in series with second switch unit 20122, the negative pole of the first diode 201211
It is connected with the positive pole of direct voltage source 2011；The positive pole and the two or two of the first diode 201211
The negative pole of pole pipe 201221 connects；The positive pole of the second diode 201221 and direct voltage source
The negative pole of 2011 connects.
Optionally, described first switching device 201212 includes: metal-oxide layer-quasiconductor-
(Metal-Oxide-SemiconductorField-EffectTransistor is called for short field-effect transistor
And/or second switch device 201222 includes MOSFET): metal-oxide layer-quasiconductor-
Field-effect transistor.
It should be noted that each switch element can also include with diode and switching device also
The electric capacity of connection, or contribute to switching device and realize other devices of Sofe Switch state effect, this
Invent without limitation.
It should be noted that can also use other alternately disconnected by switch with connect so that
DC voltage produces the switch element of square-wave voltage, the invention is not limited in this regard.
It should be noted that the first switching device 201212 is with second switch device 201222 also
It can be other the semiconductor switching device in addition to metal-oxide layer-quasiconductor-field-effect transistor
Part, such as audion, IGBT(Insulated Gate Bipolar Transistor, insulated gate is double
Bipolar transistor), the present invention is without limitation.
Further, rectification circuit 203, including: first electric capacity the 501, second electric capacity 502,
3rd diode 503 and the 4th diode 504.
It should be noted that include at rectification circuit 203: first electric capacity the 501, second electric capacity
502, when the 3rd diode 503 and four diodes 504, it is each that rectification circuit 203 includes
The connection of individual device can have two ways, it is achieved the exchange exported by the second resonant inductance 2023
Resonance potential carries out rectification and obtains commutating voltage, and is exported by described commutating voltage.Tool
Body is as follows:
In the first connected mode, the positive pole of the 3rd diode 503 and the 4th diode 504
Negative pole be connected, the negative pole of the 3rd diode 503 and one end of the second electric capacity 502 are connected,
The positive pole of the 4th diode 504 and the other end of the second electric capacity 502 are connected, the first electric capacity
One end of 501 is connected with the negative pole of the 4th diode 504, and the other end of the first electric capacity 501 is even
Connecing one end of the second resonant inductance 2023, the positive pole of the 4th diode 504 connects the second resonance
The other end of inductance 2023, the second electric capacity 502 two ends output commutating voltage, as shown in Figure 5.
Further, by the commutating voltage output of the second electric capacity 502 two ends output to coupled
Load, for load provide voltage.
It should be noted that according to above-mentioned 3rd diode 503 and the company of the 4th diode 504
The rectification circuit that the mode of connecing realizes, the commutating voltage in the second electric capacity 502 two ends output is positive electricity
Pressure, is positive voltage output.
In the second connected mode, the negative pole of the 3rd diode 503 and the 4th diode 504
Positive pole be connected, the positive pole of the 3rd diode 503 and one end of the second electric capacity 502 are connected,
The negative pole of the 4th diode 504 and the other end of the second electric capacity 502 are connected, the first electric capacity 501
One end be connected with the positive pole of the 4th diode 504, the other end of the first electric capacity 501 connects the
One end of two resonant inductances 2023, the negative pole of the 4th diode 504 connects the second resonant inductance
The other end of 2023, the second electric capacity 502 two ends output commutating voltage, as shown in Figure 6.
Further, by the commutating voltage output of the second electric capacity 502 two ends output to coupled
Load, for load provide voltage.
It should be noted that according to above-mentioned 3rd diode 503 and the company of the 4th diode 504
The rectification circuit that the mode of connecing realizes, the commutating voltage in the second electric capacity 502 two ends output is negative electricity
Pressure, is negative voltage output.
Or, rectification circuit 203, as it is shown in fig. 7, comprises: first electric capacity the 501, second electricity
Hold the 502, the 3rd electric capacity the 505, the 3rd diode 503 and the 4th diode 504.
Concrete, the positive pole of the 3rd diode 503 and the negative pole of the 4th diode 504 are connected,
The negative pole of the 3rd diode 503 and one end of the second electric capacity 502 are connected, the 4th diode
The positive pole of 504 and the other end of the second electric capacity 502 are connected, one end of the first electric capacity 501 with
The negative pole of the 4th diode 504 connects, and the other end of the first electric capacity 501 connects the second resonance electricity
One end of sense 2023, one end of the 3rd electric capacity 505 connects another of the second resonant inductance 2023
End, the other end of the 3rd electric capacity 505 connects the positive pole of the 4th diode 504, the second electric capacity
502 two ends output commutating voltages.
Further, by the commutating voltage output of the second electric capacity 502 two ends output to coupled
Load, for load provide voltage.
It should be noted that with reference to Fig. 7, the first electric capacity 501 and the 3rd electric capacity 505 have every
From effect, then DC-DC transfer circuit achieves the isolation of input voltage and output voltage.
It should be noted that other rectification circuits can also be used to realize to exchange resonance potential
Carrying out rectification, and then output DC voltage, the present invention is without limitation.
As shown in Figure 8, the reality of a kind of DC-DC transfer circuit provided for the embodiment of the present invention
Illustrate and be intended to.DC-DC transfer circuit includes square wave generation circuit 201, LLC resonance circuit
202 and rectification circuit 203.
Concrete, in square wave generation circuit 201, the first diode 201211 is opened with first
Close device 201212 to be connected in parallel, the second diode 201221 and second switch device 201222
Being connected in parallel, the first switch element 20121 is connected in series with second switch unit 20122,
The negative pole of the first diode 201211 is connected with the positive pole of direct voltage source 2011；One or two pole
The positive pole of pipe 201211 and the negative pole of the second diode 201221 connect；Second diode
The positive pole of 201221 is connected with the negative pole of direct voltage source 2011.
In LLC resonance circuit 202, one end of the first resonant inductance 2022 is produced with square wave
The company of series connection of the first switch element 20121 and second switch unit 20122 in raw circuit 201
Contact connects, and the other end of the first resonant inductance 2022 connects with one end of resonant capacitance 2021
Connecing, the other end of resonant capacitance 2021 and one end of the second resonant inductance 2023 connect, the
The other end of two resonant inductances 2023 with direct voltage source 2011 in square wave generation circuit 201
Negative pole connect.
In rectification circuit 203, the positive pole of the 3rd diode 503 and the 4th diode 504
Negative pole connect, one end connection of the negative pole of the 3rd diode 503 and the second electric capacity 502, the
The positive pole of four diodes 504 and the other end of the second electric capacity 502 connect, the first electric capacity 501
One end is connected with the negative pole of the 4th diode 504, and the other end of the first electric capacity 501 connects LLC
One end of second resonant inductance 2023, the positive pole of the 4th diode 504 in resonance circuit 202
Connect the other end of the second resonant inductance 2023, the second electric capacity 502 in LLC resonance circuit 202
Two ends output commutating voltage.
Specific works principle is, uses the first switch element 20121 in square wave generation circuit 201
Carry out connection alternately with second switch unit 20122 and disconnect respectively at the first switch element
20121 produce square-wave waveform voltage with second switch unit 20122 two ends, when square-wave waveform electricity
When pressure is applied to LLC resonance circuit 202, owing to LLC resonance circuit has the effect of filtering,
Sinusoidal current can only be flowed through in LLC resonance circuit 202, thus in LLC resonance circuit
Second resonant inductance 2023 two ends produce exchange resonance potential, further will produce exchange
Resonance potential exports to rectification circuit 203, according to the 3rd diode 503 in rectification circuit 203
Connected mode with the 4th diode 504, it can be determined that when the second resonant inductance 2023 two ends
Alternating voltage is for time negative, and the 4th diode 504 turns on, and the 3rd diode 503 ends, electric current
Through the 3rd diode 503, first electric capacity 501 is charged, when the second resonant inductance 2023
The alternating voltage at two ends is timing, and the 3rd diode 503 turns on, and the 4th diode 504 ends,
Now, the voltage on the first electric capacity 501 with exchange resonance potential added in series to the second electric capacity 502
It is charged, charging is so repeated, thus completes switching process.Additionally, due to second
The voltage at electric capacity 502 two ends is identical with the positive voltage direction of exchange resonance potential, so the second electricity
The voltage holding 502 two ends outputs is positive voltage.
As it is shown in figure 9, the reality of the another kind of DC-DC converter provided for the embodiment of the present invention
Illustrate and be intended to.DC-DC transfer circuit includes square wave generation circuit 201, LLC resonance circuit
202 and rectification circuit 203.
Concrete, in square wave generation circuit 201, the first diode 201211 is opened with first
Close device 201212 to be connected in parallel, the second diode 201221 and second switch device 201222
Being connected in parallel, the first switch element 20121 is connected in series with second switch unit 20122,
The negative pole of the first diode 201211 is connected with the positive pole of direct voltage source 2011；One or two pole
The positive pole of pipe 201211 and the negative pole of the second diode 201221 connect；Second diode
The positive pole of 201221 is connected with the negative pole of direct voltage source 2011.
In LLC resonance circuit 202, one end of the first resonant inductance 2022 is produced with square wave
The company of series connection of the first switch element 20121 and second switch unit 20122 in raw circuit 201
Contact connects, and the other end of the first resonant inductance 2022 connects with one end of resonant capacitance 2021
Connecing, the other end of resonant capacitance 2021 and one end of the second resonant inductance 2023 connect, the
The other end of two resonant inductances 2023 with direct voltage source 2011 in square wave generation circuit 201
Negative pole connect.
In rectification circuit 203, the negative pole of the 3rd diode 503 and the 4th diode 504
Positive pole connects, and the positive pole of the 3rd diode 503 and one end of the second electric capacity 502 connect, and the 4th
The negative pole of diode 504 and the other end of the second electric capacity 502 connect, the one of the first electric capacity 501
End is connected with the positive pole of the 4th diode 504, the other end of the first electric capacity 501 and LLC resonance
In circuit 202, one end of the second resonant inductance 2023 connects, and the negative pole of the 4th diode 504 is even
Connect the other end of the second resonant inductance 2023 in LLC resonance circuit 202, the second electric capacity 502
Two ends output commutating voltage.
It should be noted that the operation principle of the DC-DC transfer circuit shown in Fig. 9, for
Producing square-wave waveform voltage and refer to Fig. 8 with exchanging resonance potential, the present invention does not repeats them here.
For rectification circuit 203, according to the 3rd diode 503 and the 4th in rectification circuit 203
The connected mode of diode 504, it can be determined that when the alternating current at the second resonant inductance 2023 two ends
Pressure is timing, and the 4th diode 504 turns on, and the 3rd diode 503 ends, and electric current is through the 4th
First electric capacity 501 is charged by diode 504, when the friendship at the second resonant inductance 2023 two ends
Stream voltage is for time negative, and the 3rd diode 503 turns on, and the 4th diode 504 ends, now,
Second electric capacity 502 is carried out by the voltage on the first electric capacity 501 with exchanging resonance potential added in series
Charging, is so repeated charging, thus completes switching process.Additionally, due to the second electric capacity
The voltage at 502 two ends is identical with the negative voltage direction of exchange resonance potential, so the second electric capacity 502
The voltage of two ends output is negative voltage.
In the present invention, it is also possible to the second resonant inductance in the DC transfer circuit shown in Fig. 8
Connect between 2023 with the 4th diode 504 the 3rd electric capacity 505, as shown in Figure 10, if
By 505 liang of terminal shortcircuits of the 3rd electric capacity, then Figure 10 can be converted into the circuit diagram shown in Fig. 8, i.e.
It is converted into positive voltage output circuit.If by one end of the 3rd electric capacity 505 and the second resonant capacitance
The junction point that one end of 2023 connects, with negative pole and second electric capacity 502 of the 3rd diode 503
One end connect junction point two terminal shortcircuit, then Figure 10 can be converted into Fig. 9, is i.e. converted into negative
Voltage follower circuit.
Concrete, the operation principle of the DC-dc conversion shown in Figure 10 refers to Fig. 8 or figure
The operation principle of 9, the present invention does not repeats them here.This DC-DC transfer circuit can realize
Input voltage is isolated with output voltage.
Embodiments provide a kind of DC-DC transfer circuit, including: square wave produces electricity
Road, LLC resonance circuit and rectification circuit, wherein, LLC resonance circuit includes the humorous of series connection
Shake electric capacity, the first resonant inductance and the second resonant inductance, will LLC resonance electricity in prior art
Transformator in road replaces with the second resonant inductance, so, is being coupled to square wave generation circuit
When LLC resonance circuit receives the voltage of square wave generation circuit output square-wave waveform, can be the
Output AC resonance potential on two resonant inductances；And exchange resonance potential is entered by rectification circuit
Row rectification, and then obtain commutating voltage, and by commutating voltage output to load, and without directly
Transformer apparatus is added on stream-DC transfer circuit, thus when realizing DC-dc conversion, fall
The low volume of DC-DC transfer circuit so that circuit can simple realization, and reduce
The cost of circuit.
A kind of method embodiments providing circuit, described method is applied to the side of including
Wave generation circuit, LLC resonance circuit and the DC-DC transfer circuit of rectification circuit, wherein,
Described LLC resonance circuit is coupled to described square wave generation circuit, and includes: series connection humorous
Shake electric capacity, the first resonant inductance and the second resonant inductance；Described rectification circuit is coupled to described
Two resonant inductances.As shown in figure 11, described method includes:
1101, the voltage of described square wave generation circuit output square-wave waveform.
Concrete, square wave generation circuit includes: direct voltage source and the first switch element connected
With second switch unit, and the first switch element and the second switch unit of series connection be coupled to direct current
Voltage source, the first switch element and second switch unit are according to the magnitude of voltage and of direct voltage source
Fixed dutycycle connects and disconnects, when the first switch element connection, and second switch list
Unit disconnects, then the first switch element produces high level signal, i.e. produces the electricity with direct voltage source
The voltage signal that pressure value is equal, second switch unit is low level signal；When the first switch element
During disconnection, second switch unit connects, and now, the first switch element is become from high level signal
Low level signal, second switch unit is become high level signal from low level signal, i.e. produce with
The voltage signal that the magnitude of voltage of direct voltage source is equal, thus the first switch element and second switch
Unit can produce the height of the magnitude of voltage that magnitude of voltage is direct voltage source within the regular hour
Level signal, magnitude of voltage is the square-wave waveform voltage of the low level signal of zero.
It should be noted that in side circuit, work in soft to realize DC-to-dc circuit
On off state, when the first switch element disconnects, second switch unit needs through a dead band
Time just can connect, when second switch element disconnects, first switch element need through
One Dead Time just can connect, thus causes the square wave ripple of the voltage of the first switch element generation
, there is time delay, as shown in figure 12 with the square-wave waveform of the voltage of second switch unit generation in shape.
It should be noted that when the first switch element disconnects, second switch unit is through one
Dead Time connects, and when second switch element disconnects, first switch element is through one
Dead Time connect, it is also possible to avoid the first switch element to connect with second switch unit simultaneously and
The input dc power potential source short circuit caused.
1102, described LLC resonance circuit receives described square wave generation circuit output square-wave waveform
Voltage.
Concrete, owing to LLC resonance circuit couples and square wave generation circuit, then produce when square wave
During circuit output square-wave waveform voltage, the side of LLC resonance circuit recipient's wave generation circuit output
Waveform voltage.
1103, described LLC resonance circuit output AC resonance on described second resonant inductance
Voltage.
Concrete, LLC resonance circuit includes the first resonant inductance, resonant capacitance and second
Resonant inductance.Owing to LLC resonance circuit has filter action, then square-wave waveform voltage application
When LLC resonance circuit, only sinusoidal current can flow through LLC resonance circuit, Jin Er
The two ends of the second resonant inductance can produce exchange resonance potential.
Exemplary, switching device is MOSFET, it is assumed that f is opening of square wave generation circuit
Closing frequency, fs is first resonant inductance resonant frequency with resonant capacitance generation of series connection, fp
It is the first resonant inductance, resonant capacitance and the resonant frequency of the second resonant inductance generation, then
When fp < f is < during fs, under normal load condition, it is possible to achieve switch element works in no-voltage
Conducting state；Loading the biggest, switch element the most easily works in zero current passing state；Negative
Carry the least, then switch element is less susceptible to work in zero current passing state when load, works as f > fs
Time, it is also possible to realize switch element and work in no-voltage conducting state.
When switch element works in no-voltage conducting state, opening according to square wave generation circuit
Close the relation of frequency f and series resonance frequency fs, so that are produced from the second resonant inductance two ends
Raw voltage is higher than direct voltage source or is less than the voltage that direct voltage source provides, thus can
To realize blood pressure lowering and the boosting of DC-DC transfer circuit.
If the switching frequency of square wave generation circuit is less than series resonance frequency fs, then DC-to-dc
Translation circuit is in boost mode.If the switching frequency of square wave generation circuit is higher than series resonance
Frequency fs, then DC-DC transfer circuit is in decompression mode.If opening of square wave generation circuit
Close frequency and be equal to series resonance frequency fs, in ignoring circuit in the case of components and parts pressure drop,
Then the input voltage of DC-DC transfer circuit is equal with output voltage.
1104, described rectification circuit is by the exchange resonance electricity by described second resonant inductance output
Pressure carries out rectification and obtains commutating voltage.
Concrete, due to the second resonant inductance output is exchange resonance potential, when exchange resonance
Voltage is for time negative, and the 4th diode current flow, the 3rd diode cut-off, electric current is through the four or two pole
First electric capacity is charged by pipe.When exchange resonance potential is timing, the 3rd diode current flow,
4th diode cut-off, now, the voltage on the first electric capacity with exchange resonance potential added in series
Second electric capacity is charged, charging is so repeated, according to the unilateral conduction of diode,
Thus the exchange resonance potential of the second resonant inductance output is converted into DC voltage, i.e. obtain whole
Stream voltage.
1105, described commutating voltage is exported by described rectification circuit.
Concrete, rectification circuit by the direct voltage output that obtains after rectification to and rectified current
The load that road connects, provides voltage for load.
A kind of method embodiments providing circuit, utilizes square wave generation circuit generation side
The voltage of waveform, and the square-wave waveform voltage of generation is exported to the resonant capacitance including series connection,
The LLC resonance circuit of the first resonant inductance and the second resonant inductance, humorous further with LLC
Shake the filter action of circuit, humorous at the second resonant inductance two ends output AC of LLC resonance circuit
Shake voltage, and by rectification circuit, the exchange resonance potential of generation is carried out rectification, and then obtains
Commutating voltage, and by commutating voltage output to load, and without on DC-DC transfer circuit
Add transformer apparatus, thus when realizing DC-dc conversion, reduce DC-dc conversion
The volume of circuit so that circuit can simple realization, and reduce the cost of circuit.
Embodiments provide a kind of electronic installation, as shown in figure 13, including: direct current
-DC transfer circuit 1301, power supply 1302 and load 1303.Wherein,
Described DC-DC transfer circuit 1301 becomes for the DC-to-dc described in above-described embodiment
Change circuit.
Described power supply 1302 is for powering to described DC-DC transfer circuit 1301.
Described DC-DC transfer circuit 1301 is for powering to described load 1303.
Optionally, described electronic installation, as shown in figure 14, it is also possible to include filter capacitor
1304, one end of this filter capacitor 1304 connects power supply 1302, this filter capacitor 1304
The other end connect DC-DC transfer circuit 1301, for power supply 1302 is exported
Voltage be filtered.
Embodiments provide a kind of electronic installation, including DC-DC transfer circuit, supply
Electricity power supply and load, this DC-DC transfer circuit includes square wave generation circuit, LLC resonance electricity
Road and rectification circuit.Wherein, LLC resonance circuit includes the resonant capacitance of series connection, first humorous
Shake inductance and the second resonant inductance, will replace by the transformator in LLC resonance circuit in prior art
It is changed to the second resonant inductance, so, connects at the LLC resonance circuit being coupled to square wave generation circuit
When receiving the voltage of square wave generation circuit output square-wave waveform, can be defeated on the second resonant inductance
Go out to exchange resonance potential；And exchange resonance potential is carried out rectification by rectification circuit, and then obtain
To commutating voltage, and by commutating voltage output to load, and without at DC-DC transfer circuit
Upper interpolation transformer apparatus, thus when realizing DC-dc conversion, reduce DC-to-dc and become
Change the volume of circuit so that circuit can simple realization, and reduce the cost of circuit.
Last it is noted that above example is only in order to illustrate technical scheme, and
Non-to its restriction；Although the present invention being described in detail with reference to previous embodiment, ability
The those of ordinary skill in territory is it is understood that it still can be to the skill described in foregoing embodiments
Art scheme is modified, or wherein portion of techniques feature is carried out equivalent；And these are repaiied
Change or replace, not making the essence of appropriate technical solution depart from various embodiments of the present invention technical side
The spirit and scope of case.
Claims (9)
1. a DC-DC transfer circuit, it is characterised in that including:
Square wave generation circuit, for exporting the voltage of square-wave waveform；
LLC resonance circuit, including: the resonant capacitance of series connection, the first resonant inductance and the second resonance
Inductance, the transformator in described LLC resonance circuit is replaced by described second resonant inductance；
Described LLC resonance circuit is coupled to described square wave generation circuit, is used for receiving described square wave and produces
The voltage of raw circuit output square-wave waveform, and output AC resonance on described second resonant inductance
Voltage；
Rectification circuit, is coupled to described second resonant inductance, for by by described second resonance electricity
The exchange resonance potential of sense output carries out rectification and obtains commutating voltage, and described rectified current is pressed into
Row output；
Wherein, described rectification circuit includes the first electric capacity, the second electric capacity, the 3rd diode and the four or two
Pole is managed, or described rectification circuit includes the first electric capacity, the second electric capacity, the 3rd electric capacity, the 3rd diode
With the 4th diode.
Circuit the most according to claim 1, it is characterised in that described square wave generation circuit bag
Including direct voltage source and bridge circuit, wherein, described bridge circuit is coupled to described direct voltage source,
Described bridge circuit includes the first switch element and the second switch unit of series connection, by described first
Switch element and described second switch unit carry out connection alternately and disconnection is opened described first respectively
The two ends closing unit and described second switch unit produce described square-wave waveform voltage.
Circuit the most according to claim 2, it is characterised in that described first switch element bag
Include the first diode and first switching device of parallel connection；Described second switch unit includes the of parallel connection
Two diodes and second switch device；
Described bridge circuit is coupled to described direct voltage source and includes:
The negative pole of described first diode is connected with the positive pole of described direct voltage source；
The positive pole of described first diode is connected with the negative pole of described second diode；
The positive pole of described second diode is connected with the negative pole of described direct voltage source.
Circuit the most according to claim 3, it is characterised in that described first switching device bag
Include metal-oxide layer-quasiconductor-field-effect transistor；And/or described second switch device include metal-
Oxide layer-quasiconductor-field-effect transistor.
5. according to the circuit described in any one of claim 1-4, it is characterised in that the described 3rd 2
The positive pole of pole pipe is connected with the negative pole of described 4th diode, the negative pole of described 3rd diode with
One end of described second electric capacity is connected, the positive pole of described 4th diode and described second electric capacity
The other end is connected, and one end of described first electric capacity is connected with the negative pole of described 4th diode, institute
The other end stating the first electric capacity connects one end of described second resonant inductance, described 4th diode
Positive pole connects the other end of described second resonant inductance, and described second electric capacity two ends export described rectification
Voltage.
6. according to the circuit described in any one of claim 1-4, it is characterised in that
The negative pole of described 3rd diode is connected with the positive pole of described 4th diode, and the described 3rd
The positive pole of diode is connected with one end of described second electric capacity, the negative pole of described 4th diode with
The other end of described second electric capacity is connected, one end of described first electric capacity and described 4th diode
Positive pole connect, the other end of described first electric capacity connects one end of described second resonant inductance, institute
The negative pole stating the 4th diode connects the other end of described second resonant inductance, described second electric capacity two
End exports described commutating voltage.
7. according to the circuit described in any one of claim 1-4, it is characterised in that
The positive pole of described 3rd diode is connected with the negative pole of described 4th diode, and the described 3rd
The negative pole of diode is connected with one end of described second electric capacity, the positive pole of described 4th diode with
The other end of described second electric capacity is connected, one end of described first electric capacity and described 4th diode
Negative pole connect, the other end of described first electric capacity connects one end of described second resonant inductance, institute
The one end stating the 3rd electric capacity connects the other end of described second resonant inductance, described 3rd electric capacity another
One end connects the positive pole of described 4th diode, and described second electric capacity two ends export described commutating voltage.
8. the method for work of a circuit, it is characterised in that described method is applied to include that square wave produces
Raw circuit, LLC resonance circuit and the DC-DC transfer circuit of rectification circuit, wherein, described
LLC resonance circuit is coupled to described square wave generation circuit, and includes: the resonant capacitance of series connection,
First resonant inductance and the second resonant inductance, the transformator in described LLC resonance circuit is replaced by institute
State the second resonant inductance；Described rectification circuit is coupled to described second resonant inductance, wherein, described whole
Current circuit includes the first electric capacity, the second electric capacity, the 3rd diode and the 4th diode, or described rectification
Circuit includes the first electric capacity, the second electric capacity, the 3rd electric capacity, the 3rd diode and the 4th diode, institute
The method of stating includes:
The voltage of described square wave generation circuit output square-wave waveform；
Described LLC resonance circuit receives the voltage of described square wave generation circuit output square-wave waveform；
Described LLC resonance circuit is output AC resonance potential on described second resonant inductance；
Described rectification circuit is by carrying out whole by the exchange resonance potential of described second resonant inductance output
Stream obtains commutating voltage；
Described commutating voltage is exported by described rectification circuit.
9. an electronic installation, it is characterised in that include described in any one of claim 1-7 is straight
Stream-DC transfer circuit, power supply and load；
Described power supply is for powering to described DC-DC transfer circuit；Described DC-to-dc
Translation circuit is for described load supplying.
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| CN201310686958.6A CN103683940B (en) | 2013-12-13 | 2013-12-13 | A kind of DC-DC transfer circuit, device and method of work |
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| CN201310686958.6A CN103683940B (en) | 2013-12-13 | 2013-12-13 | A kind of DC-DC transfer circuit, device and method of work |
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| CN103683940B true CN103683940B (en) | 2017-01-04 |
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|---|---|---|---|---|
| CN1750375A (en) * | 2005-08-11 | 2006-03-22 | 浙江大学 | Resonant current transformer with secondary element device voltage stress is half of output voltage |
| CN101425751A (en) * | 2007-11-02 | 2009-05-06 | 台达电子工业股份有限公司 | Resonance converter system and control method thereof |
| CN101997418A (en) * | 2009-08-25 | 2011-03-30 | 赵琳博 | LLC (liquid level control) type serial-parallel resonant converter |
| CN103326587A (en) * | 2013-07-17 | 2013-09-25 | 潘海铭 | Light load control method and device of LLC (Liquid Level Control) resonant converter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010086943A (en) * | 2008-09-04 | 2010-04-15 | Toshiba Lighting & Technology Corp | Led lighting device and illumination fixture |
| KR101264024B1 (en) * | 2010-12-22 | 2013-05-13 | 삼성전기주식회사 | Control circuit of llc resonant converter and llc resonant converter using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750375A (en) * | 2005-08-11 | 2006-03-22 | 浙江大学 | Resonant current transformer with secondary element device voltage stress is half of output voltage |
| CN101425751A (en) * | 2007-11-02 | 2009-05-06 | 台达电子工业股份有限公司 | Resonance converter system and control method thereof |
| CN101997418A (en) * | 2009-08-25 | 2011-03-30 | 赵琳博 | LLC (liquid level control) type serial-parallel resonant converter |
| CN103326587A (en) * | 2013-07-17 | 2013-09-25 | 潘海铭 | Light load control method and device of LLC (Liquid Level Control) resonant converter |
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