CN117811373A - DC/DC converter - Google Patents
DC/DC converter Download PDFInfo
- Publication number
- CN117811373A CN117811373A CN202211173293.4A CN202211173293A CN117811373A CN 117811373 A CN117811373 A CN 117811373A CN 202211173293 A CN202211173293 A CN 202211173293A CN 117811373 A CN117811373 A CN 117811373A
- Authority
- CN
- China
- Prior art keywords
- switch tube
- bridge
- full
- conversion circuit
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 97
- 238000004804 winding Methods 0.000 claims description 78
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000010354 integration Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 10
- 230000010363 phase shift Effects 0.000 abstract description 10
- 230000004907 flux Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000009466 transformation Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Abstract
The application discloses a DC/DC converter, including converter input, converter output, full-bridge LLC resonant conversion circuit and phase-shifting full-bridge conversion circuit. The input end of the full-bridge LLC resonant conversion circuit and the input end of the phase-shift full-bridge conversion circuit are connected with the input end of the converter in parallel, and the output end of the full-bridge LLC resonant conversion circuit and the output end of the phase-shift full-bridge conversion circuit are connected with the negative electrode of the output end after being connected in series. The DC/DC converter not only can realize closed-loop regulation of output voltage under the condition that the switching frequency is kept constant, but also reduces the size of a magnetic core and the loss of the magnetic core by using the magnetic integrated transformer through a method of magnetic flux cancellation, thereby greatly improving the conversion efficiency and the power density of the converter.
Description
Technical Field
The present application relates to the field of power electronics, and more particularly to a DC/DC converter.
Background
The isolation-stage DC/DC converter is used as a key link of power electronic transformation and is used as an important node of the whole transformation device in various application scenes, and the common isolation-stage DC/DC converter takes an LLC type resonant transformation circuit or a phase-shifting full-bridge transformation circuit as a main topology. However, the inventors of the present application have found in practice that although soft switching characteristics in the full load range can be achieved with an LLC resonant converter circuit as the main topology, when the switching frequency is far from the resonant frequency point, a very high loop current is formed, and the efficiency becomes low; the phase-shifting full-bridge conversion circuit is used as a main topology, and has larger voltage-varying capability, but the phase-shifting full-bridge conversion circuit can only realize zero-voltage switching-on of a primary side switching tube, and cannot realize zero-current switching-off of a secondary side rectifying tube, so that the phase-shifting full-bridge conversion circuit has lower efficiency.
Disclosure of Invention
In view of this, the present application provides a DC/DC converter to improve conversion efficiency.
In order to achieve the above object, the following solutions have been proposed:
a DC/DC converter comprising a converter input, a converter output, a full-bridge LLC resonant conversion circuit, and a phase-shifted full-bridge conversion circuit, wherein:
the input end of the full-bridge LLC resonant conversion circuit is connected with the input end of the converter, the positive electrode of the output end of the full-bridge LLC resonant conversion circuit is connected with the positive electrode of the output end of the converter, and the negative electrode of the output end of the full-bridge LLC resonant conversion circuit is connected with the positive electrode of the output end of the phase-shifting full-bridge conversion circuit;
the input end of the phase-shifting full-bridge conversion circuit is connected with the input end of the converter, the positive electrode of the output end of the phase-shifting full-bridge conversion circuit is connected with the negative electrode of the output end of the full-bridge LLC resonant conversion circuit, and the negative electrode of the output end of the phase-shifting full-bridge conversion circuit is connected with the negative electrode of the output end of the converter;
the full-bridge LLC resonant conversion circuit comprises a first inverter circuit, an LLC resonant circuit and a first full-bridge rectifying circuit, wherein the LLC resonant circuit is connected with the first inverter circuit, and the LLC resonant circuit is also connected with the first full-bridge rectifying circuit through a magnetic integration transformer;
the phase-shifting full-bridge conversion circuit comprises a second inverter circuit, a resonant circuit and a second full-bridge rectification circuit, wherein the resonant circuit is connected with the second inverter circuit, and the resonant circuit is also connected with the second full-bridge rectification circuit through the magnetic integrated transformer.
Optionally, the filter inductor is further included, wherein:
one end of the filter inductor is connected with the positive electrode of the output end of the phase-shifting full-bridge conversion circuit, and the other end of the filter inductor is connected with the negative electrode of the output end of the full-bridge LLC resonant conversion circuit.
Optionally, the magnetic integrated transformer includes a magnetic core, the magnetic core includes a first center pillar, a second center pillar, a first side pillar and a second side pillar, the magnetic core includes a first winding and a second winding that are disposed on the magnetic core and are mutually coupled, and a third winding and a fourth winding that are disposed on the magnetic core and are mutually coupled.
Optionally, the first winding is wound on the first central post along a first direction and is also wound on the second central post along a second direction;
the second winding is wound on the first central post along the first direction and is also wound on the second central post along the second direction;
the third winding is wound on the first side column along the first direction and is also wound on the second side column along the second direction;
the fourth winding is wound on the first leg in the first direction and is also wound on the second leg in the second direction.
Optionally, the first inverter circuit includes a first bridge arm and a second bridge arm connected with the input end of the converter and connected in parallel, where:
the first bridge arm comprises a first power switch tube and a second power switch tube, and the source electrode of the first power switch tube is connected with the drain electrode of the second power switch tube;
the second bridge arm comprises a third power switch tube and a fourth power switch tube, and the source electrode of the third power switch tube is connected with the drain electrode of the fourth power switch tube;
the LLC resonant circuit comprises a first resonant inductor and a resonant capacitor which are connected in series, one end of the first resonant inductor is connected with the source electrode of the first power switch tube, the other end of the first resonant inductor is connected with one end of the resonant capacitor, the other end of the resonant capacitor is connected with one end of the first winding, and the source electrode of the third power switch tube is connected with the other end of the first winding.
Optionally, the second inverter circuit includes the second bridge arm and a third bridge arm connected in parallel with the second bridge arm, where:
the source electrode of the third power switch tube is connected with one end of the third winding;
the third bridge arm comprises a fifth power switch tube and a sixth power switch tube, a source electrode of the fifth power switch tube is connected with a drain electrode of the sixth switch tube, the resonant circuit comprises a second resonant inductor, one end of the second resonant inductor is connected with the source electrode of the fifth power switch tube, and the other end of the second resonant inductor is connected with the other end of the third winding.
Optionally, the control signals of the first bridge arm, the second bridge arm and the third bridge arm are high-frequency PWM signals, and the duty ratio of the high-frequency PWM signals is 50%.
Optionally, the control signal applied to the first leg is 180 ° out of phase with the control signal applied to the second leg.
Optionally, the first full-bridge rectifier circuit includes first rectifier switching tube, second rectifier switching tube, third rectifier switching tube and fourth rectifier switching tube, wherein:
the source electrode of the first rectifying switch tube is connected with the drain electrode of the second rectifying switch tube and is connected with one end of the second winding;
the source electrode of the third rectifying switch tube is connected with the drain electrode of the fourth rectifying switch tube and is connected with the other end of the second winding;
the positive electrode of the output end of the LLC resonant conversion circuit is respectively connected with the drain electrode of the first rectifying switch tube and the drain electrode of the third rectifying switch tube;
and the negative electrode of the output end of the LLC resonant conversion circuit is respectively connected with the source electrode of the second rectifying switch tube and the source electrode of the fourth rectifying switch tube.
Optionally, the second full-bridge rectifier circuit includes a fifth rectifier switching tube, a sixth rectifier switching tube, a seventh rectifier switching tube and an eighth rectifier switching tube, wherein:
the source electrode of the fifth rectifying switch tube is connected with the drain electrode of the sixth rectifying switch tube and is connected with one end of the fourth winding;
the source electrode of the seventh rectifying switch tube is connected with the drain electrode of the eighth rectifying switch tube and is connected with the other end of the fourth winding;
the positive electrode of the output end of the phase-shifting full-bridge conversion circuit is respectively connected with the drain electrode of the fifth rectifying switch tube and the drain electrode of the seventh rectifying switch tube;
and the negative electrode of the output end of the phase-shifting full-bridge conversion circuit is respectively connected with the source electrode of the sixth rectifying switch tube and the source electrode of the eighth rectifying switch tube.
From the above technical scheme, the application discloses a DC/DC converter, which comprises a converter input end, a converter output end, a full-bridge LLC resonant conversion circuit and a phase-shifting full-bridge conversion circuit. The input end of the full-bridge LLC resonant conversion circuit and the input end of the phase-shift full-bridge conversion circuit are connected with the input end of the converter in parallel, and the output end of the full-bridge LLC resonant conversion circuit and the output end of the phase-shift full-bridge conversion circuit are connected with the negative electrode of the output end after being connected in series; the full-bridge LLC resonant conversion circuit comprises a first inverter circuit, an LLC resonant circuit and a first full-bridge rectifying circuit, wherein the LLC resonant circuit is connected with the first inverter circuit, and is also connected with the first full-bridge rectifying circuit through a magnetic integration transformer; the phase-shifting full-bridge conversion circuit comprises a second inverter circuit, a resonant circuit and a second full-bridge rectification circuit, wherein the resonant circuit is connected with the second inverter circuit, and the resonant circuit is also connected with the second full-bridge rectification circuit through a magnetic integration transformer. The DC/DC converter not only can realize closed-loop regulation of output voltage under the condition that the switching frequency is kept constant, but also reduces the size of a magnetic core and the loss of the magnetic core by using the magnetic integrated transformer through a method of magnetic flux cancellation, thereby greatly improving the conversion efficiency and the power density of the converter.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of one embodiment provided herein;
FIG. 2 is a schematic diagram of a winding manner of a primary winding of a magnetic integrated transformer of a DC/DC converter according to an embodiment of the application;
FIG. 3 is a schematic diagram of a secondary winding of a magnetic integrated transformer of a DC/DC converter according to an embodiment of the present application;
fig. 4 is a timing diagram of a DC/DC converter according to an embodiment of the present application;
fig. 5 is a primary current loop diagram of the DC/DC converter according to the embodiment of the present application at time t0 to t 1.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Fig. 1 is a circuit diagram of a DC/DC converter according to an embodiment of the present application.
As shown in fig. 1, the DC/DC converter provided in this embodiment has a magnetically integrated transformer T, including a converter input 10, a converter output 20, a full-bridge LLC resonant conversion circuit, and a phase-shifted full-bridge conversion circuit. For boosting or stepping down the input direct current based on it to obtain direct current having the same or different voltage from the input direct current.
The input end of the full-bridge LLC resonant conversion circuit is connected with the input end of the converter, the positive electrode of the output end of the full-bridge LLC resonant conversion circuit is connected with the positive electrode Vout+ of the output end of the converter, and the negative electrode of the output end of the full-bridge LLC resonant conversion circuit is connected with the positive electrode of the output end of the phase-shifting full-bridge conversion circuit; the input end of the phase-shifting full-bridge conversion circuit is connected with the input end of the converter, the positive electrode of the output end of the phase-shifting full-bridge conversion circuit is connected with the negative electrode of the output end of the full-bridge LLC resonant conversion circuit, and the negative electrode of the output end of the phase-shifting full-bridge conversion circuit is connected with the negative electrode Vout of the output end of the converter;
the full-bridge LLC resonant conversion circuit comprises a first inverter circuit 31, an LLC resonant circuit 32 and a first full-bridge rectification circuit 33, wherein the LLC resonant circuit is connected with the first inverter circuit, and the LLC resonant circuit is also connected with the first full-bridge rectification circuit through a magnetic integration transformer T; the phase-shifting full-bridge conversion circuit comprises a second inverter circuit 41, a resonant circuit 42 and a second full-bridge rectification circuit 43, wherein the resonant circuit is connected with the second inverter circuit, and the resonant circuit is also connected with the second full-bridge rectification circuit through a magnetic integration transformer.
In addition, the DC/DC converter further comprises a filter inductor L, wherein one end of the filter inductor L is connected with the positive electrode of the output end of the phase-shifting full-bridge conversion circuit, and the other end of the filter inductor L is connected with the negative electrode of the output end of the full-bridge LLC resonant conversion circuit.
In this embodiment, the magnetic integrated transformer includes a magnetic core including a first center pillar, a second center pillar, a first side pillar, a second side pillar, a first winding and a second winding disposed on the magnetic core and coupled to each other, and a third winding and a fourth winding disposed on the magnetic core and coupled to each other.
As shown in fig. 2, the primary winding a end is a first end of the first winding, the secondary end is a second end of the first winding, the primary winding C end is a first end of the third winding, and the secondary end is a second end of the third winding.
Wherein, part of the wires of the first winding are wound on the first central column along the first direction, and are wound on the first central column from the end A to the end B along the clockwise direction; the other part of the lead wire of the first winding is also wound on the second central column along the second direction, and is wound on the second central column from the end A to the end B along the anticlockwise direction;
part of the wires of the third winding are wound on the first side column along the first direction, and the wires are wound on the first side column from the C end to the D end along the clockwise direction; the other part of the lead wire of the third winding is also wound on the second side column along the second direction, and is wound on the second side column from the C end to the D end along the anticlockwise direction;
as shown in fig. 3, the secondary winding A1 end is a first end of the second winding, the B1 end is a second end of the second winding, the C1 end is a first end of the fourth winding, and the D1 end is a second end of the fourth winding.
Wherein, part of the wires of the second winding are wound on the first central column along the first direction, and are wound on the first central column from the end A1 to the end B1 along the clockwise direction; the other part of the lead wire of the second winding is wound on the second central column along the second direction, and is wound on the second central column from the end A1 to the end B1 along the anticlockwise direction;
part of the wires of the fourth winding are wound on the first side column along the first direction, and are wound on the first side column from the C1 end to the D1 end along the clockwise direction; another portion of the wire of the fourth winding is wound around the second leg in the second direction from the C1 end to the D1 end in the counterclockwise direction.
Through the winding method, magnetic fluxes generated by the first winding and the second winding on the first central column and the second central column can be offset on the first side column and the second side column; magnetic fluxes generated by the third winding and the fourth winding on the first side column and the second side column are offset on the first center column and the second center column; in this way, the magnetic integrated transformer reduces the magnetic core size and the magnetic core loss by implementing the scheme of magnetic flux cancellation, and improves the conversion efficiency and the power density of the converter.
The first inverter circuit comprises a first bridge arm and a second bridge arm which are connected with the input end of the converter in parallel. The first bridge arm comprises a first power switch tube Q1 and a second power switch tube Q2, and the source electrode of the first power switch tube is connected with the drain electrode of the second power switch tube; the second bridge arm comprises a third power switch tube Q3 and a fourth power switch tube Q4, and the source electrode of the third power switch tube is connected with the drain electrode of the fourth power switch tube;
the LLC resonant circuit comprises a first resonant inductor Lr1 and a resonant capacitor Cr which are connected in series, one end of the first resonant inductor is connected with the source electrode of the first power switch tube, the other end of the first resonant inductor is connected with one end of the resonant capacitor, the other end of the resonant capacitor is connected with one end of the first winding, and the source electrode of the third power switch tube is connected with the other end of the first winding.
The second inverter circuit comprises a second bridge arm and a third bridge arm connected with the second bridge arm in parallel. The source electrode of the third power switch tube is connected with one end of the third winding; the third bridge arm comprises a fifth power switch tube Q5 and a sixth power switch tube Q6, the source electrode of the fifth power switch tube is connected with the drain electrode of the sixth switch tube, the resonant circuit comprises a second resonant inductor Lr2, one end of the second resonant inductor is connected with the source electrode of the fifth power switch tube, and the other end of the second resonant inductor is connected with the other end of the third winding.
The first full-bridge rectifying circuit comprises a first rectifying switch tube Q7, a second rectifying switch tube Q8, a third rectifying switch tube Q9 and a fourth rectifying switch tube Q10.
The source electrode of the first rectifying switch tube is connected with the drain electrode of the second rectifying switch tube and is connected with one end of the second winding; the source electrode of the third rectifying switch tube is connected with the drain electrode of the fourth rectifying switch tube and is connected with the other end of the second winding; the positive electrode of the output end of the LLC resonant conversion circuit is respectively connected with the drain electrode of the first rectifying switch tube and the drain electrode of the third rectifying switch tube; the negative electrode of the output end of the LLC resonant conversion circuit is respectively connected with the source electrode of the second rectifying switch tube and the source electrode of the fourth rectifying switch tube.
The second full-bridge rectifying circuit comprises a fifth rectifying switch tube Q11, a sixth rectifying switch tube Q12, a seventh rectifying switch tube Q13 and an eighth rectifying switch tube Q14.
The source electrode of the fifth rectifying switch tube is connected with the drain electrode of the sixth rectifying switch tube and is connected with one end of the fourth winding; the source electrode of the seventh rectifying switch tube is connected with the drain electrode of the eighth rectifying switch tube and is connected with the other end of the fourth winding; the positive electrode of the output end of the phase-shifting full-bridge conversion circuit is respectively connected with the drain electrode of the fifth rectifying switch tube and the drain electrode of the seventh rectifying switch tube; the negative electrode of the output end of the phase-shifting full-bridge conversion circuit is respectively connected with the source electrode of the sixth rectifying switch tube and the source electrode of the eighth rectifying switch tube.
Fig. 4 is a timing chart of the DC/DC converter according to the embodiment of the present application. The full-bridge LLC resonant conversion circuit is controlled by a high-frequency PWM signal with 50% duty ratio, the first power switching tube and the second power switching tube are complementarily conducted, the third power switching tube and the fourth power switching tube are complementarily conducted, and the phase difference between the first power switching tube and the third power switching tube is 180 degrees.
The full-bridge LLC resonant conversion circuit adopts fixed frequency control, works near a resonant frequency point and has a switching frequencyThe voltage conversion ratio is constant and is independent of the load, < >>n LLC Is the turn ratio of the first winding and the second winding.
The phase-shifting full-bridge conversion circuit is controlled by a high-frequency PWM signal with 50% duty ratio, and the fifth power switching tube and the sixth power switching tube are complementarily conducted.
The phase-shifting full-bridge conversion circuit adopts phase-shifting control, and adjusts output voltage by changing the phase-shifting angle, so that closed-loop adjustment of the output voltage is realized.n PSFB For the turn ratio of the third winding and the fourth winding, T is the period value of the phase-shifting full-bridge converter, T PHASE Is the phase shift angle of the phase shift full bridge converter.
The full-bridge LLC resonant conversion circuit and the phase-shift full-bridge conversion circuit are output in series, so that the gain of the DC/DC converter is equal to the sum of the gains of the LLC resonant conversion circuit and the phase-shift full-bridge conversion circuit, and V is output O ＝V O_LLC +V O_PSFB 。
Fig. 5 is a primary current loop diagram of the DC/DC converter according to the embodiment of the present application at time t0 to t 1.
For the full-bridge LLC resonant conversion circuit at the time t 0-t 1, the primary side power switching tubes Q1 and Q4 are turned on, and the Q2 and Q3 are turned off, wherein LLC resonant circuit current is positive, the first resonant inductor Lr1 and the resonant capacitor Cr resonate, the resonant current changes in a sine form, and the LLC resonant circuit impedance is zero due to the fact that the full-bridge LLC switching frequency is equal to the resonant frequency, and the difference between the LLC resonant current and the exciting inductor current is transmitted to the secondary side. The current flow direction of the full-bridge LLC resonant conversion circuit is positive of an input power supply, the power switching tube Q1, the resonant inductor Lr1, the resonant capacitor Cr, the first winding of the transformer, the power switching tube Q4 and negative of the input power supply.
For the phase-shifting full-bridge conversion circuit, primary side power switching tubes Q4 and Q5 are conducted, Q3 and Q6 are turned off, and the current flow direction of the phase-shifting full-bridge conversion circuit is positive of an input power supply, the power switching tube Q5, the resonant inductor Lr2, the third winding of a transformer, the power switching tube Q4 and negative of the input power supply.
According to the technical scheme, the embodiment provides the DC/DC converter which comprises a converter input end, a converter output end, a full-bridge LLC resonant conversion circuit and a phase-shifting full-bridge conversion circuit. The input end of the full-bridge LLC resonant conversion circuit and the input end of the phase-shift full-bridge conversion circuit are connected with the input end of the converter in parallel, and the output end of the full-bridge LLC resonant conversion circuit and the output end of the phase-shift full-bridge conversion circuit are connected with the negative electrode of the output end after being connected in series; the full-bridge LLC resonant conversion circuit comprises a first inverter circuit, an LLC resonant circuit and a first full-bridge rectifying circuit, wherein the LLC resonant circuit is connected with the first inverter circuit, and is also connected with the first full-bridge rectifying circuit through a magnetic integration transformer; the phase-shifting full-bridge conversion circuit comprises a second inverter circuit, a resonant circuit and a second full-bridge rectification circuit, wherein the resonant circuit is connected with the second inverter circuit, and the resonant circuit is also connected with the second full-bridge rectification circuit through a magnetic integration transformer. The DC/DC converter not only can realize closed-loop regulation of output voltage under the condition that the switching frequency is kept constant, but also reduces the size of a magnetic core and the loss of the magnetic core by using the magnetic integrated transformer through a method of magnetic flux cancellation, thereby greatly improving the conversion efficiency and the power density of the converter.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present principles and embodiments may be better understood; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. The DC/DC converter is characterized by comprising a converter input end, a converter output end, a full-bridge LLC resonant conversion circuit and a phase-shifting full-bridge conversion circuit, wherein:
the input end of the full-bridge LLC resonant conversion circuit is connected with the input end of the converter, the positive electrode of the output end of the full-bridge LLC resonant conversion circuit is connected with the positive electrode of the output end of the converter, and the negative electrode of the output end of the full-bridge LLC resonant conversion circuit is connected with the positive electrode of the output end of the phase-shifting full-bridge conversion circuit;
the input end of the phase-shifting full-bridge conversion circuit is connected with the input end of the converter, the positive electrode of the output end of the phase-shifting full-bridge conversion circuit is connected with the negative electrode of the output end of the full-bridge LLC resonant conversion circuit, and the negative electrode of the output end of the phase-shifting full-bridge conversion circuit is connected with the negative electrode of the output end of the converter;
the full-bridge LLC resonant conversion circuit comprises a first inverter circuit, an LLC resonant circuit and a first full-bridge rectifying circuit, wherein the LLC resonant circuit is connected with the first inverter circuit, and the LLC resonant circuit is also connected with the first full-bridge rectifying circuit through a magnetic integration transformer;
the phase-shifting full-bridge conversion circuit comprises a second inverter circuit, a resonant circuit and a second full-bridge rectification circuit, wherein the resonant circuit is connected with the second inverter circuit, and the resonant circuit is also connected with the second full-bridge rectification circuit through the magnetic integrated transformer.
2. The DC/DC converter of claim 1, further comprising a filter inductance, wherein:
one end of the filter inductor is connected with the positive electrode of the output end of the phase-shifting full-bridge conversion circuit, and the other end of the filter inductor is connected with the negative electrode of the output end of the full-bridge LLC resonant conversion circuit.
3. The DC/DC converter of claim 1 wherein the magnetically integrated transformer comprises a magnetic core comprising a first center leg, a second center leg, a first side leg, and a second side leg, the first and second windings including a first winding and a second winding disposed on the magnetic core and coupled to each other, and a third winding and a fourth winding disposed on the magnetic core and coupled to each other.
4. A DC/DC converter according to claim 3, wherein the first winding is wound on the first central limb in a first direction and is also wound on the second central limb in a second direction;
the second winding is wound on the first central post along the first direction and is also wound on the second central post along the second direction;
the third winding is wound on the first side column along the first direction and is also wound on the second side column along the second direction;
the fourth winding is wound on the first leg in the first direction and is also wound on the second leg in the second direction.
5. The DC/DC converter of claim 3 wherein the first inverter circuit includes first and second legs connected in parallel with the converter input, wherein:
the first bridge arm comprises a first power switch tube and a second power switch tube, and the source electrode of the first power switch tube is connected with the drain electrode of the second power switch tube;
the second bridge arm comprises a third power switch tube and a fourth power switch tube, and the source electrode of the third power switch tube is connected with the drain electrode of the fourth power switch tube;
the LLC resonant circuit comprises a first resonant inductor and a resonant capacitor which are connected in series, one end of the first resonant inductor is connected with the source electrode of the first power switch tube, the other end of the first resonant inductor is connected with one end of the resonant capacitor, the other end of the resonant capacitor is connected with one end of the first winding, and the source electrode of the third power switch tube is connected with the other end of the first winding.
6. The DC/DC converter of claim 5 wherein the second inverter circuit includes the second leg and a third leg connected in parallel with the second leg, wherein:
the source electrode of the third power switch tube is connected with one end of the third winding;
the third bridge arm comprises a fifth power switch tube and a sixth power switch tube, a source electrode of the fifth power switch tube is connected with a drain electrode of the sixth switch tube, the resonant circuit comprises a second resonant inductor, one end of the second resonant inductor is connected with the source electrode of the fifth power switch tube, and the other end of the second resonant inductor is connected with the other end of the third winding.
7. The DC/DC converter of claim 6 wherein the control signals of the first leg, the second leg, and the third leg are high frequency PWM signals having a duty cycle of 50%.
8. The DC/DC converter of claim 7 wherein the control signal applied to the first leg is 180 ° out of phase with the control signal applied to the second leg.
9. A DC/DC converter according to claim 3, wherein the first full-bridge rectifier circuit includes a first rectifier switching tube, a second rectifier switching tube, a third rectifier switching tube, and a fourth rectifier switching tube, wherein:
the source electrode of the first rectifying switch tube is connected with the drain electrode of the second rectifying switch tube and is connected with one end of the second winding;
the source electrode of the third rectifying switch tube is connected with the drain electrode of the fourth rectifying switch tube and is connected with the other end of the second winding;
the positive electrode of the output end of the LLC resonant conversion circuit is respectively connected with the drain electrode of the first rectifying switch tube and the drain electrode of the third rectifying switch tube;
and the negative electrode of the output end of the LLC resonant conversion circuit is respectively connected with the source electrode of the second rectifying switch tube and the source electrode of the fourth rectifying switch tube.
10. A DC/DC converter according to claim 3, wherein the second full-bridge rectifier circuit includes a fifth rectifier switching tube, a sixth rectifier switching tube, a seventh rectifier switching tube, and an eighth rectifier switching tube, wherein:
the source electrode of the fifth rectifying switch tube is connected with the drain electrode of the sixth rectifying switch tube and is connected with one end of the fourth winding;
the source electrode of the seventh rectifying switch tube is connected with the drain electrode of the eighth rectifying switch tube and is connected with the other end of the fourth winding;
the positive electrode of the output end of the phase-shifting full-bridge conversion circuit is respectively connected with the drain electrode of the fifth rectifying switch tube and the drain electrode of the seventh rectifying switch tube;
and the negative electrode of the output end of the phase-shifting full-bridge conversion circuit is respectively connected with the source electrode of the sixth rectifying switch tube and the source electrode of the eighth rectifying switch tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211173293.4A CN117811373A (en) | 2022-09-26 | 2022-09-26 | DC/DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211173293.4A CN117811373A (en) | 2022-09-26 | 2022-09-26 | DC/DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117811373A true CN117811373A (en) | 2024-04-02 |
Family
ID=90430642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211173293.4A Pending CN117811373A (en) | 2022-09-26 | 2022-09-26 | DC/DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117811373A (en) |
-
2022
- 2022-09-26 CN CN202211173293.4A patent/CN117811373A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10269484B2 (en) | Magnetic component and power conversion device using the same | |
| US10283261B2 (en) | Power conversion device | |
| US10325714B2 (en) | Integrated magnetic component and switched mode power converter | |
| US8072785B2 (en) | Switching power supply unit | |
| CN110138225B (en) | Control method for current source type double-transformer bidirectional DC-DC converter | |
| CN108736726B (en) | Converter | |
| US6831846B2 (en) | Switching power source circuit with drive frequency variably controlled by switching element | |
| WO2015106701A1 (en) | Ac-dc conversion circuit and control method therefor | |
| US20230113753A1 (en) | Dc/dc converter and method for controlling output voltage thereof | |
| Takagi et al. | Dynamic control and dead-time compensation method of an isolated dual-active-bridge DC-DC converter | |
| JP2014509180A (en) | Self-excited push-pull converter | |
| JP2000295852A (en) | Power supply device | |
| CN114465490A (en) | Interleaved voltage-multiplying wide-output LLC resonant converter and control method thereof | |
| WO2005015725A1 (en) | Switching power supply device | |
| CN117811373A (en) | DC/DC converter | |
| CN114884363B (en) | Double LLC resonant converter with six-time gain ratio and control method thereof | |
| WO2018157797A1 (en) | Full-bridge resonant converter | |
| CN114944710A (en) | Wireless charging device without communication and cascade DC-DC converter | |
| TWI631802B (en) | Converter | |
| Deng et al. | A passive integration unit for current-feed single-switch resonant converter | |
| TWI837806B (en) | Llc resonant converter with variable resonant tank | |
| CN219068071U (en) | DC/DC converter | |
| CN112737345B (en) | Control method of wide-load-range zero-voltage switch phase-shifted full-bridge converter | |
| CN214674878U (en) | Power adapter | |
| TWI837808B (en) | Llc resonant converter with windings fabricated on pcbs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |