CN117767585A - Power conversion circuit and electronic device - Google Patents
Power conversion circuit and electronic device Download PDFInfo
- Publication number
- CN117767585A CN117767585A CN202311476734.2A CN202311476734A CN117767585A CN 117767585 A CN117767585 A CN 117767585A CN 202311476734 A CN202311476734 A CN 202311476734A CN 117767585 A CN117767585 A CN 117767585A
- Authority
- CN
- China
- Prior art keywords
- winding
- coupled
- branch
- circuit
- inverter
- 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 title claims abstract description 42
- 238000004804 winding Methods 0.000 claims abstract description 96
- 230000008878 coupling Effects 0.000 claims abstract description 46
- 238000010168 coupling process Methods 0.000 claims abstract description 46
- 238000005859 coupling reaction Methods 0.000 claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 230000004907 flux Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Inverter Devices (AREA)
Abstract
The invention provides a power conversion circuit and a wireless charging system, wherein the power conversion circuit is characterized in that electric energy transmission is carried out between a primary side circuit and a secondary side circuit through a magnetic coupling transformer; the primary circuit comprises a control unit and N first branches, each first branch is coupled to the input end of the inverter by a voltage source, the first output end of the inverter is coupled to the first end of the first winding of the corresponding magnetic coupling transformer by a first capacitor, the first capacitor and the corresponding first winding form a primary resonance network, and the resonance frequency of the primary resonance network corresponding to each first branch is the same; the second output end of the inverter is coupled to the second end of the corresponding first winding; the control units are respectively coupled to the control ends of the inverters so as to control the same phase of the voltage waveforms output by the inverters, and the magnetic field coupling superposition is utilized to realize larger circuit power transmission capacity, so that the power processing capacity of the power converter can be enlarged under the condition that the working reliability of the power converter is ensured.
Description
Technical Field
The present invention relates to the field of power converter topologies, and in particular, to a power conversion circuit and an electronic device.
Background
In recent years, high-power charging technology is widely used in the field of power converter topologies, particularly in the field of fast charging and in the field of charging piles.
Since the withstand voltage and current capabilities of a single power switch tube or power switch module are limited, in order to enable a power converter with higher power handling capabilities, it is currently common to connect multiple power modules in parallel and to use the same signal to control the switches in the power modules. However, in practical implementations, the parallel power switch or power switch module may cause the power switch to fail due to parasitic inductance and other factors that may be present in the circuit.
Therefore, how to expand the power processing capability of the power converter while ensuring the operational reliability of the power converter has become a technical problem that needs to be solved in the industry.
Disclosure of Invention
The invention provides a power conversion circuit and electronic equipment, which are used for solving the technical problem of how to enlarge the power processing capability of a power converter under the condition of ensuring the working reliability of the power converter.
According to a first aspect of the present invention, there is provided a power conversion circuit comprising: primary side circuit, magnetic coupling transformer and secondary side circuit; the primary side circuit is coupled to the output end of the voltage source; the primary side circuit and the secondary side circuit are in electric energy transmission through a magnetic coupling transformer; the secondary side circuit is coupled to the load module;
the primary circuit comprises a control unit and N first branches, each first branch comprises a voltage source, an inverter and a first capacitor, wherein N is an integer, and N is more than or equal to 2;
the voltage source is coupled to an input end of the inverter, a first output end of the inverter is coupled to a first end of a first winding of the corresponding magnetic coupling transformer through the first capacitor, and a second output end of the inverter is coupled to a second end of the first winding of the corresponding magnetic coupling transformer; the control units are respectively coupled to the control ends of the inverters; wherein:
the first capacitor in each first branch and the corresponding first winding form a primary resonance network; and the resonance frequency of the primary side resonance network corresponding to each first branch is the same;
the first winding is used for generating a first magnetic flux under the action of the voltage source;
the secondary circuit is used for inducing first magnetic flux generated by each first winding and generating corresponding induction current;
the control unit is configured to: the phase of the voltage waveform output by each inverter is controlled to be the same.
Optionally, the secondary circuit includes M second branches, each of which includes a second winding, a second capacitor and a rectifier;
the first end of the second winding is coupled to the first input end of the rectifier through the second capacitor, and the second end of the second winding is coupled to the second input end of the rectifier; wherein M is an integer, and M is more than or equal to 1;
the second capacitor in each second branch circuit and the second winding form a secondary side resonance network, the resonance frequency of the secondary side resonance network corresponding to each second branch circuit is the same, and the resonance frequency of the primary side resonance network corresponding to the first branch circuit and the secondary side resonance network corresponding to the second branch circuit are the same;
wherein the positive output end of at least one rectifier is coupled to the positive input end of the load module, and the negative output end of at least one rectifier is coupled to the negative input end of the load module.
Optionally, the magnetic coupling transformer is a magnetic core transformer, and the first winding and the second winding are both wound on the magnetic core.
Optionally, the magnetic coupling transformer is a non-contact transformer, and a gap exists between a combination of a first winding and a primary magnetic core corresponding to the non-contact transformer and a second winding and a secondary magnetic core, wherein the first winding is a transmitting coil, and the second winding is a receiving coil.
Optionally, a coupling coefficient between the first winding and the second winding is greater than 0.1.
Optionally, the coupling coefficient between the second winding and each first winding is the same.
Optionally, the resonant frequency of the primary side resonant network corresponding to the first branch, the resonant frequency of the primary side resonant network corresponding to the second branch, and the switching frequency of the inverter corresponding to the first branch are all the same.
Optionally, the rectifiers in the M second branches are output in parallel; wherein:
positive output ends of the M rectifiers are coupled to positive input ends of the load modules, and negative output ends of the M rectifiers are coupled to negative input ends of the load modules.
Optionally, the secondary side circuit comprises J second branches, and rectifiers in the J second branches are sequentially connected in series for output; wherein J is an integer, and J is not less than 2: wherein:
the positive electrode output end of the rectifier corresponding to the 1 st second branch is coupled to the positive electrode input end of the load module, the positive electrode output end of the ith rectifier is coupled to the negative electrode output end of the i-1 st rectifier, and the negative electrode output end of the rectifier corresponding to the J-th second branch is coupled to the negative electrode input end of the load module; wherein i is an integer, and i is more than 1 and less than or equal to J.
Optionally, the control unit is further configured to: the waveform, amplitude and phase of the voltage output by each inverter are controlled to be the same.
Optionally, the voltage source includes N voltage source units, and an input terminal of each inverter is respectively coupled to the corresponding voltage source unit.
According to a second aspect of the present invention, there is provided a wireless charging system comprising the power conversion circuit provided in any one of the first aspects of the present invention.
In the power conversion circuit and the wireless charging system provided by the invention, the primary side circuit and the secondary side circuit in the power conversion circuit are subjected to electric energy transmission through the magnetic coupling transformer; the primary circuit comprises a control unit and N first branches, each first branch is coupled to the input end of the inverter by a voltage source, the first output end of the inverter is coupled to the first end of the first winding of the corresponding magnetic coupling transformer by a first capacitor, the first capacitor and the corresponding first winding form a primary resonance network, and the resonance frequency of the primary resonance network corresponding to each first branch is the same; the second output end of the inverter is coupled to the second end of the corresponding first winding; the control units are respectively coupled to the control ends of the inverters so as to control the phases of the voltage waveforms output by the inverters to be the same, and the magnetic field coupling superposition is utilized to realize larger circuit power transmission capacity, so that the power processing capacity of the power converter can be enlarged under the condition that the working reliability of the power converter is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic configuration diagram of a power conversion circuit in an embodiment of the present invention;
FIG. 2 is an effect diagram of an inverter output voltage waveform for the power conversion circuit of FIG. 1;
fig. 3 is a schematic configuration diagram of a power conversion circuit in the first embodiment of the present invention;
fig. 4 is a schematic configuration diagram of a power conversion circuit in a second embodiment of the present invention;
fig. 5 is a schematic configuration diagram of a power conversion circuit in a third embodiment of the present invention;
fig. 6 is a waveform effect diagram of the power conversion circuit shown in fig. 4 in operation;
fig. 7 is a schematic configuration diagram of a power conversion circuit in a fourth embodiment of the present invention;
fig. 8 is a schematic configuration diagram of a power conversion circuit in a fifth embodiment of the present invention;
fig. 9 is a schematic configuration diagram of a power conversion circuit in a sixth embodiment of the present invention;
fig. 10 is a schematic configuration diagram of a power conversion circuit in a seventh embodiment of the present invention;
reference numerals illustrate:
a 2-magnetic coupling transformer;
3-secondary side circuitry;
4-a load module;
11-a control unit;
121-a voltage source;
122-an inverter;
123-a first winding;
311-second winding;
312-rectifier;
21-a magnetic core;
q1-a first switching tube;
q2-a second switching tube;
q3-a third switching tube;
q4-fourth switching tube;
q5-a fifth switching tube;
q6-sixth switching tube.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
In view of the prior art, there is a problem that it is difficult to secure the power processing capability of the power converter while ensuring the reliability of the operation thereof. The invention provides a power conversion circuit and a wireless charging system, wherein the power conversion circuit is characterized in that electric energy transmission is carried out between a primary side circuit and a secondary side circuit through a magnetic coupling transformer; the primary circuit comprises a control unit and N first branches, each first branch is coupled to the input end of the inverter by a voltage source, the first output end of the inverter is coupled to the first end of the first winding of the corresponding magnetic coupling transformer by a first capacitor, the first capacitor and the corresponding first winding form a primary resonance network, and the resonance frequency of the primary resonance network corresponding to each first branch is the same; the second output end of the inverter is coupled to the second end of the corresponding first winding; the control units are respectively coupled to the control ends of the inverters so as to control the same phase of the voltage waveforms output by the inverters, and the magnetic field coupling superposition is utilized to realize larger circuit power transmission capacity, so that the power processing capacity of the power converter can be enlarged under the condition that the working reliability of the power converter is ensured.
Referring to fig. 1, an embodiment of the present invention provides a power conversion circuit, including: a primary circuit, a magnetic coupling transformer 2, and a secondary circuit 3; the primary side circuit is coupled to the output of the voltage source 121; the primary side circuit and the secondary side circuit 3 are in electric energy transmission through a magnetic coupling transformer 2; the secondary side circuit 3 is coupled to a load module 4;
the primary circuit comprises a control unit 11 and N first branches, each first branch comprises a voltage source 121, an inverter 122 and a first capacitor, wherein N is an integer, and N is more than or equal to 2;
the voltage source 121 is coupled to an input terminal of the inverter 122, a first output terminal of the inverter 122 is coupled to a first terminal of a corresponding first winding 123 of the magnetic coupling transformer 2 through the first capacitor, and a second output terminal of the inverter 122 is coupled to a second terminal of the corresponding first winding 123 of the magnetic coupling transformer 2; the control unit 11 is coupled to the control end of each inverter 122; wherein:
the first capacitor in each first leg forms a primary resonant network with the corresponding first winding 123; and the resonance frequency of the primary side resonance network corresponding to each first branch is the same;
the first winding 123 is configured to generate a first magnetic flux under the action of the voltage source 121;
the secondary circuit 3 is configured to induce a first magnetic flux generated by each first winding 123 and generate a corresponding induced current;
the control unit 11 is configured to: the phases of the voltage waveforms output by the inverters 122 are controlled to be the same, i.e., the centers of the voltage waveforms output by the inverters 122 are aligned.
Specifically, referring to fig. 2, fig. 2 shows a voltage waveform effect diagram of the output of the inverter 122 corresponding to two first branches, which is specifically described as follows:
v1, which can be understood as a voltage waveform output by the inverter 122 corresponding to the 1 st first branch;
v2, which can be understood as a voltage waveform output by the inverter 122 corresponding to the 2 nd first branch;
as long as the phases of the voltage waveforms output by the inverters 122 are the same (i.e., the centers of the voltage waveforms output by the inverters 122 are aligned), the power output by the inverters 122 corresponding to the two first branches may be superimposed by the magnetic coupling transformer 2.
The first capacitor in each first branch and the corresponding first winding 123 form a primary resonance network, because the first winding 123 is used as a primary winding of the magnetic coupling transformer 2 and also as an inductor, and forms a primary resonance network with the corresponding first capacitor. Under the condition that the resonance frequency of the primary side resonance network corresponding to each first branch is the same, the distortion of current in the winding can be reduced, the electric energy loss caused by reactive power is reduced, and the power transmission capacity of the transformer is maximized.
The primary circuit comprises N first branches, the N first branches are connected in parallel in a magnetic coupling mode, and the inverters 122 corresponding to each branch are not interfered with each other, so that the power processing capacity of the circuit can be enlarged under the condition that the working reliability of the power converter is ensured.
In one embodiment, referring to fig. 3, the secondary circuit 3 includes M second branches, each of which includes a second winding 311, a second capacitor and a rectifier 312;
a first end of the second winding 311 is coupled to a first input terminal of the rectifier 312 through the second capacitor, and a second end of the second winding 311 is coupled to a second input terminal of the rectifier 312; wherein M is an integer, and M is more than or equal to 1;
the second capacitor in each second branch circuit and the second winding 311 form a secondary side resonant network, the resonant frequency of the secondary side resonant network corresponding to each second branch circuit is the same, and the resonant frequency of the primary side resonant network corresponding to the first branch circuit and the secondary side resonant network corresponding to the second branch circuit are the same;
since the outputs of the rectifiers 312 corresponding to each second branch are isolated from each other, in one embodiment, the positive output terminal of at least one of the rectifiers 312 is coupled to the positive input terminal of the load module 4, and the negative output terminal of at least one of the rectifiers 312 is coupled to the negative input terminal of the load module 4.
In a specific example, referring to fig. 4, the secondary circuit 3 includes J second branches (two second branches are shown in fig. 4), and rectifiers 312 in the J second branches are sequentially connected in series for output; wherein J is an integer, and J is not less than 2: wherein:
the positive output end of the rectifier 312 corresponding to the 1 st second branch is coupled to the positive input end of the load module, the positive output end of the i-th rectifier 312 is coupled to the negative output end of the i-1 st rectifier 312, and the negative output end of the rectifier 312 corresponding to the J-th second branch is coupled to the negative input end of the load module; wherein i is an integer, and i is more than 1 and less than or equal to J.
In another specific example, please refer to fig. 5, the rectifiers 312 in the M second branches are output in parallel with each other (two second branches are shown in fig. 5), wherein:
the positive output terminals of the M rectifiers 312 are all coupled to the positive input terminal of the load module 4, and the negative output terminals of the M rectifiers 312 are all coupled to the negative input terminal of the load module 4.
In a specific embodiment, referring to fig. 4, the magnetic coupling transformer 2 is a core transformer, and the first winding 123 and the second winding 311 are both wound on the core 21. The power conversion circuit is magnetically coupled with N first windings 123 and M second windings 311 on the magnetic core 21, wherein the magnetic core 21 is air-gap, so that the magnetic core 21 can be divided into two parts, and can be used for a non-contact power transmission system (wireless charging). In the example shown in fig. 4, the magnetic core 21 includes a first side leg and a second side leg;
the first windings 123 corresponding to the N first branches are all wound on the first side posts, and the second windings 311 corresponding to the M second branches are all wound on the second side posts.
In the example shown in fig. 4, the first winding corresponding to the 1 st first branch is L1, the first winding corresponding to the 2 nd first branch is L2, the second winding corresponding to the 1 st second branch is L3, and the second winding corresponding to the 2 nd second branch is L4.
In a preferred embodiment, the coupling coefficient between the second winding 311 and each first winding 123 is the same. Specifically, please refer to the example of fig. 9, which illustrates a case where the secondary circuit 3 includes only 1 second branch, in a preferred embodiment, a coupling coefficient between the second winding L3 and the first winding L1 corresponding to the second branch should be equal to a coupling coefficient between the second winding and the first winding L2 corresponding to the second branch.
To boost the output of the power conversion circuit, in a preferred embodiment, the control unit 11 is further configured to: the waveform, amplitude, and phase of the voltage output by each inverter 122 are controlled to be the same.
On this basis, in order to better embody the operation effect of the present invention, the operation effect of the power conversion circuit of the present invention will be described with reference to the waveform diagrams shown in fig. 4 and 6:
the waveform diagram shown in fig. 6 is a waveform effect diagram of the power conversion circuit shown in fig. 4 during operation, and specifically described as follows:
v (V1), which can be understood as a voltage waveform output from the inverter 122 corresponding to the 1 st first branch;
v (V2), which can be understood as a voltage waveform output by the inverter 122 corresponding to the 2 nd first branch;
i (C1), which can be understood as a waveform of a current flowing through the first capacitor corresponding to the 1 st first branch;
i (C2), which can be understood as a waveform of a current flowing through the first capacitor corresponding to the 2 nd first branch;
i (C3), which can be understood as a waveform of a current flowing through the second capacitor corresponding to the 1 st second branch;
i (C4), which can be understood as a waveform of a current flowing through the second capacitor corresponding to the 2 nd second branch;
v (O1), which can be understood as the voltage waveform output by the rectifier 312 corresponding to the 1 st second branch;
v (O2), which can be understood as the voltage waveform output by the rectifier 312 corresponding to the second branch 2;
in the circuit shown in fig. 4, the voltage waveforms output by the inverter 122 corresponding to the 1 st first branch and the 2 nd first branch are identical (the power processed and transmitted by the two inverters 122 are identical), so that the current flowing through the first capacitor corresponding to the 1 st first branch is identical to the current flowing through the first capacitor corresponding to the 2 nd first branch, the current flowing through the second capacitor corresponding to the 1 st second branch is identical to the current flowing through the second capacitor corresponding to the 2 nd second branch, and the voltage output by the rectifier 312 corresponding to the 1 st second branch is identical to the voltage output by the rectifier 312 corresponding to the 2 nd second branch, thereby verifying that the circuit provided by the invention can superimpose the power output by each first branch through the magnetic coupling transformer 2 and transmit the superimposed power to the load module 4 through the rectifier 312 corresponding to the secondary side circuit 3.
In other examples, the magnetic coupling may be performed by using a coil, and in the example shown in fig. 7, the magnetic coupling transformer 2 is a non-contact transformer, and a combination of a first winding and a primary magnetic core corresponding to the non-contact transformer and a second winding and a secondary magnetic core have a gap, where the first winding 123 is a transmitting coil, and the second winding 311 is a receiving coil.
In this case, in a preferred embodiment, the coupling coefficient between each of the first windings 123 is greater than 0.1.
In other preferred embodiments, the coupling coefficient between the second winding 311 and each first winding 123 is the same. In actual operation, the winding positions of the first windings 123 should be set close to each other, so that the coupling coefficients of the first windings 123 and the second windings 311 are close to each other.
In the above specific example, the input terminals of each inverter 122 are coupled to the same voltage source 121, and it should be understood that the present invention is not limited to the voltage source 121 connected to each branch, and in one example, referring to fig. 8, the voltage source 121 may include N voltage source units 1211, and the input terminals of each inverter 122 are respectively coupled to the corresponding voltage source units 1211. Those skilled in the art can also select different connection modes as desired.
With respect to the implementation form of the inverter 122, the following is specifically described:
in one embodiment, referring to fig. 9, the inverter 122 is a full-bridge inverter, and an inverter corresponding to one of the first branches is now described as an example, where the full-bridge inverter includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, and a fourth switching tube Q4;
the first end of the first switching tube Q1 and the first end of the second switching tube Q2 are both coupled to the positive output end of the voltage source 121, the second end of the first switching tube Q1 is coupled to the first end of the first winding 123 and the first end of the fourth switching tube Q4, the second end of the second switching tube Q2 is coupled to the second end of the first winding 123 and the first end of the third switching tube Q3, and the second end of the third switching tube Q3 and the second end of the fourth switching tube Q4 are both coupled to the negative output end of the voltage source 121.
In this case, the control unit 11 is further configured to: and respectively controlling the on-off of a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4 corresponding to the full-bridge inverter so as to adjust the output voltage of the corresponding full-bridge inverter.
In a preferred embodiment, the resonant frequency of the primary side resonant network corresponding to the first branch, the resonant frequency of the primary side resonant network corresponding to the second branch, and the switching frequency of the inverter corresponding to the first branch (i.e., the switching frequency of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, or the fourth switching tube Q4 in the full bridge inverter) are all the same.
In other embodiments, referring to fig. 10, the inverter 122 may be a half-bridge inverter, and an inverter corresponding to one of the first branches is now described as an example, where the half-bridge inverter includes a fifth switching tube Q5 and a sixth switching tube Q6;
the first end of the fifth switching tube Q5 is coupled to the positive output end of the voltage source 121, the second end thereof is coupled to the first end of the first winding 123 and the first end of the sixth switching tube Q6, and the second end of the sixth switching tube Q6 is coupled to the negative output end of the voltage source 121 and the second end of the first winding 123, respectively.
In this case, the control unit 11 is further configured to: and respectively controlling the on-off of a fifth switching tube Q5 and a sixth switching tube Q6 corresponding to the half-bridge inverter so as to adjust the output voltage of the corresponding half-bridge inverter.
In a preferred embodiment, the resonant frequency of the primary side resonant network corresponding to the first branch, the resonant frequency of the primary side resonant network corresponding to the second branch, and the switching frequency of the inverter corresponding to the first branch (i.e., the switching frequency of the fifth switching tube Q5 or the sixth switching tube Q6 in the half-bridge inverter) are all the same.
Of course, the present invention is not limited to the specific type of the inverter 122, but may be a three-phase inverter, etc., and a suitable circuit structure may be selected as needed by those skilled in the art.
In addition, the embodiment of the invention also provides a wireless charging system which comprises the power conversion circuit. By way of example, the wireless charging system may be an automobile charging system, etc., and of course may be other electronic devices that need to be charged wirelessly.
In summary, in the power conversion circuit and the wireless charging system provided by the invention, the primary side circuit and the secondary side circuit in the power conversion circuit are subjected to electric energy transmission through the magnetic coupling transformer; the primary circuit comprises a control unit and N first branches, each first branch is coupled to the input end of the inverter by a voltage source, the first output end of the inverter is coupled to the first end of the first winding of the corresponding magnetic coupling transformer by a first capacitor, the first capacitor and the corresponding first winding form a primary resonance network, and the resonance frequency of the primary resonance network corresponding to each first branch is the same; the second output end of the inverter is coupled to the second end of the corresponding first winding; the control units are respectively coupled to the control ends of the inverters so as to control the same phase of the voltage waveforms output by the inverters, and the magnetic field coupling superposition is utilized to realize larger circuit power transmission capacity, so that the power processing capacity of the power converter can be enlarged under the condition that the working reliability of the power converter is ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (12)
1. A power conversion circuit, comprising: primary side circuit, magnetic coupling transformer and secondary side circuit; the primary side circuit is coupled to the output end of the voltage source; the primary side circuit and the secondary side circuit are in electric energy transmission through a magnetic coupling transformer; the secondary side circuit is coupled to the load module;
the primary circuit comprises a control unit and N first branches, each first branch comprises a voltage source, an inverter and a first capacitor, wherein N is an integer, and N is more than or equal to 2;
the voltage source is coupled to an input end of the inverter, a first output end of the inverter is coupled to a first end of a first winding of the corresponding magnetic coupling transformer through the first capacitor, and a second output end of the inverter is coupled to a second end of the first winding of the corresponding magnetic coupling transformer; the control units are respectively coupled to the control ends of the inverters; wherein:
the first capacitor in each first branch and the corresponding first winding form a primary resonance network; and the resonance frequency of the primary side resonance network corresponding to each first branch is the same;
the first winding is used for generating a first magnetic flux under the action of the voltage source;
the secondary circuit is used for inducing first magnetic flux generated by each first winding and generating corresponding induction current;
the control unit is configured to: the phase of the voltage waveform output by each inverter is controlled to be the same.
2. The power conversion circuit of claim 1, wherein the secondary circuit comprises M second branches, each second branch comprising a second winding, a second capacitor, and a rectifier;
the first end of the second winding is coupled to the first input end of the rectifier through the second capacitor, and the second end of the second winding is coupled to the second input end of the rectifier; wherein M is an integer, and M is more than or equal to 1;
the second capacitor in each second branch circuit and the second winding form a secondary side resonance network, the resonance frequency of the secondary side resonance network corresponding to each second branch circuit is the same, and the resonance frequency of the primary side resonance network corresponding to the first branch circuit and the secondary side resonance network corresponding to the second branch circuit are the same;
wherein the positive output end of at least one rectifier is coupled to the positive input end of the load module, and the negative output end of at least one rectifier is coupled to the negative input end of the load module.
3. The power conversion circuit of claim 2, wherein the magnetic coupling transformer is a core transformer, and the first winding and the second winding are both wound on a core.
4. The power conversion circuit of claim 2, wherein the magnetic coupling transformer is a non-contact transformer, and the combination of the first winding and the primary core corresponding to the non-contact transformer has a gap with the second winding and the secondary core, wherein the first winding is a transmitting coil, and the second winding is a receiving coil.
5. The power conversion circuit according to claim 4, wherein a coupling coefficient between the first winding and the second winding is greater than 0.1.
6. The power conversion circuit according to claim 4, wherein a coupling coefficient between the second winding and each first winding is the same.
7. The power conversion circuit of claim 2, wherein a resonant frequency of the primary side resonant network corresponding to the first leg, a resonant frequency of the primary side resonant network corresponding to the second leg, and a switching frequency of the inverter corresponding to the first leg are all the same.
8. The power conversion circuit according to any one of claims 2 to 7, wherein rectifiers in the M second branches are output in parallel with each other; wherein:
positive output ends of the M rectifiers are coupled to positive input ends of the load modules, and negative output ends of the M rectifiers are coupled to negative input ends of the load modules.
9. The power conversion circuit according to any one of claims 2 to 7, wherein the secondary side circuit includes J second branches, and rectifiers in the J second branches are sequentially connected in series to output; wherein J is an integer, and J is not less than 2: wherein:
the positive electrode output end of the rectifier corresponding to the 1 st second branch is coupled to the positive electrode input end of the load module, the positive electrode output end of the ith rectifier is coupled to the negative electrode output end of the i-1 st rectifier, and the negative electrode output end of the rectifier corresponding to the J-th second branch is coupled to the negative electrode input end of the load module; wherein i is an integer, and i is more than 1 and less than or equal to J.
10. The power conversion circuit according to claim 1, wherein the control unit is further configured to: the waveform, amplitude and phase of the voltage output by each inverter are controlled to be the same.
11. The power conversion circuit of claim 1, wherein the voltage source comprises N voltage source units, the input of each inverter being coupled to a corresponding voltage source unit, respectively.
12. A wireless charging system comprising the power conversion circuit of any one of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311476734.2A CN117767585A (en) | 2023-11-07 | 2023-11-07 | Power conversion circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311476734.2A CN117767585A (en) | 2023-11-07 | 2023-11-07 | Power conversion circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117767585A true CN117767585A (en) | 2024-03-26 |
Family
ID=90318899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311476734.2A Pending CN117767585A (en) | 2023-11-07 | 2023-11-07 | Power conversion circuit and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117767585A (en) |
-
2023
- 2023-11-07 CN CN202311476734.2A patent/CN117767585A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109428490B (en) | Multi-cell power conversion system | |
| CN109888933B (en) | Primary-side multi-module high-frequency parallel wireless power transmission system | |
| EP3337024B1 (en) | Bidirectional resonant conversion circuit and converter | |
| KR20170059389A (en) | Resonant converter for wireless charger and method for implementing thereof | |
| US20210152077A1 (en) | Filter arrangement | |
| CN106575927B (en) | Power conversion device | |
| US9225255B2 (en) | Power supply system, comprising a converter connected to a network and a transformer connected in parallel relative to the converter to limit the homopolar current, and a drive chain comprising such a power supply system | |
| US20180269726A1 (en) | Inductive Power Transmitter | |
| CN113991887A (en) | Wireless charging transmitting device and wireless charging system | |
| Lee et al. | A multilevel inverter for contactless power transfer system | |
| CN113162167B (en) | Wireless charging system with constant-current and constant-voltage automatic switching function | |
| CN105515434B (en) | Transformer circuit and device comprising same | |
| Ansari et al. | Resonant inductive wireless power transfer of two-coil system with class-e resonant high frequency inverter | |
| CN117767585A (en) | Power conversion circuit and electronic device | |
| CN110797991A (en) | kW-level power wireless electric energy transmission system based on relay converter | |
| JPS5947976A (en) | High voltage generator circuit | |
| CN114172375B (en) | Direct current converter | |
| EP3742596A1 (en) | Power converter | |
| EP3890173A1 (en) | Filter system for a converter circuit | |
| WO2018145748A1 (en) | Parallel connecting of cell modules in a modular multilevel converter by means of interphase transformers | |
| CN106374633A (en) | Voltage doubling circuit-based wireless power transmission system | |
| CN107994686B (en) | Multi-load inductive coupling power transmission device | |
| Wang et al. | An intermediate-coil and ferrite-based coupling structure with load-independent constant outputs for inductive power transfer | |
| CN206452299U (en) | A kind of converter | |
| Jayathurathnage et al. | New Concept for Current-Impressed WPT to Multiple Independent Stainless-Steel-Enclosed Linear Actuator Sliders |
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 |