CN118100636A - Multiphase resonant converter and DC-DC converter - Google Patents
Multiphase resonant converter and DC-DC converter Download PDFInfo
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- CN118100636A CN118100636A CN202410240717.7A CN202410240717A CN118100636A CN 118100636 A CN118100636 A CN 118100636A CN 202410240717 A CN202410240717 A CN 202410240717A CN 118100636 A CN118100636 A CN 118100636A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 95
- 230000001105 regulatory effect Effects 0.000 claims abstract description 63
- 238000010168 coupling process Methods 0.000 claims abstract description 46
- 238000005859 coupling reaction Methods 0.000 claims abstract description 46
- 230000008878 coupling Effects 0.000 claims abstract description 36
- 230000009466 transformation Effects 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 69
- 238000010586 diagram Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a multiphase resonant converter and a DC-DC converter, wherein the input end of a bridge circuit in the multiphase resonant converter is electrically connected with a power supply, the output end of the bridge circuit is electrically connected with the resonant circuit, and the bridge circuit is used for converting a power supply signal provided by the power supply into an alternating current signal and transmitting the alternating current signal to the resonant circuit; the resonance circuit is electrically connected between the output end of the bridge circuit and the input end of the voltage regulating circuit; the output end of the rectifying circuit is electrically connected with a load; the resonant circuit at least comprises a coupling inductor, the two resonant conversion modules are a first resonant conversion module and a second resonant conversion module respectively, and the coupling inductor of the first resonant conversion module and the coupling inductor of the second resonant conversion module form a reverse full-coupling inductor; the load electrically connected with the first resonance transformation module is a first load, the load electrically connected with the second resonance transformation module is a second load, the first load and the second load are connected in series, and a first node electrically connected with the first load and the second load is grounded.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a multiphase resonant converter and a DC-DC converter.
Background
In recent years, a switching power supply for supplying electric energy to various electric appliances is being developed toward high voltage, high power, small size, light weight, high efficiency, thinning and integration, and a voltage regulation module for providing a precise power supply for a high-precision and high-speed microprocessor such as a central Processing unit (Central Processing Unit, CPU) and a digital signal processor (DIGITAL SIGNAL Processing unit, DSP) of a computer, and a switching power supply which is widely applied to occasions such as an electric automobile, a hybrid electric vehicle, an uninterruptible power supply, an electric energy quality regulation power supply, an aviation power supply, new energy power generation and superconducting energy storage in recent years is developed, and the switching power supplies can realize zero voltage on and zero current off in a full load range by adopting a circuit topology structure of a resonant converter, so that the loss is reduced and the efficiency is improved.
In order to realize high-power application of the resonant converter, two-phase or multi-phase parallel resonant converter circuits are often adopted, and the output sides of the resonant converters are in parallel topology, but as each parallel branch of the resonant converter needs to output the same voltage, the voltage class of each branch is higher, the number of corresponding rectifying devices is more, and the overall structure of the resonant converter is larger.
Disclosure of Invention
The invention provides a multiphase resonant converter and a DC-DC converter, which are used for uniformly distributing the current of a first resonant conversion module and a second resonant conversion module, improving the controllability of load current, reducing the working voltage of the resonant conversion modules and reducing the cost.
In a first aspect, the present invention provides a multiphase resonant converter comprising two resonant conversion modules;
each resonant conversion module comprises a bridge circuit, a resonant circuit, a voltage regulating circuit and a rectifying circuit;
The input end of the bridge circuit is electrically connected with a power supply, the output end of the bridge circuit is electrically connected with the resonant circuit, and the bridge circuit is used for converting a power supply signal provided by the power supply into an alternating current signal and transmitting the alternating current signal to the resonant circuit;
The resonant circuit is electrically connected between the output end of the bridge circuit and the input end of the voltage regulating circuit, and is used for outputting a resonant signal to the voltage regulating circuit after carrying out resonant conversion on the alternating current signal;
the voltage regulating circuit is used for outputting a voltage regulating signal to the input end of the rectifying circuit after carrying out voltage regulation on the resonance signal;
The output end of the rectifying circuit is electrically connected with a load, and the rectifying circuit is used for converting the voltage regulating signal into a direct current signal and transmitting the direct current signal to the load;
The resonant circuit at least comprises a coupling inductor, wherein the two resonant conversion modules are a first resonant conversion module and a second resonant conversion module respectively, and the coupling inductor of the first resonant conversion module and the coupling inductor of the second resonant conversion module form a reverse full-coupling inductor;
the load electrically connected with the first resonance transformation module is a first load, the load electrically connected with the second resonance transformation module is a second load, the first load and the second load are connected in series, the node electrically connected with the first load and the second load is a first node, and the first node is grounded.
Optionally, the bridge circuit includes a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor;
the first electrode of the first MOS tube and the first electrode of the third MOS tube are electrically connected with the positive electrode of the power supply, and the second electrode of the first MOS tube and the first electrode of the second MOS tube are electrically connected with the first input end of the resonant circuit;
the second pole of the third MOS tube and the first pole of the fourth MOS tube are electrically connected with the second input end of the resonant circuit;
the second pole of the second MOS tube and the second pole of the fourth MOS tube are electrically connected with the negative pole of the power supply;
the first MOS tube and the fourth MOS tube are conducted simultaneously, and the second MOS tube and the third MOS tube are conducted simultaneously; the first MOS tube and the second MOS tube are conducted in a time-sharing mode.
Optionally, the resonant circuit further includes: a series resonant capacitor, a parallel resonant capacitor and a resonant inductor;
One end of the series resonance capacitor is electrically connected with the first output end of the bridge circuit, the other end of the series resonance capacitor is electrically connected with one end of the coupling inductor, the other end of the coupling inductor is electrically connected with one end of the resonance inductor, and the other end of the resonance inductor is respectively electrically connected with one end of the parallel resonance capacitor and the first input end of the voltage regulating circuit;
The other end of the parallel resonance capacitor is electrically connected with the second output end of the bridge circuit and the second input end of the voltage regulating circuit respectively.
Optionally, the voltage regulating circuit includes: a transformer;
The primary coil of the transformer is electrically connected with the output end of the resonant circuit, and the secondary coil of the transformer is electrically connected with the input end of the rectifying circuit.
Optionally, the rectifying circuit includes: a first diode, a second diode, a third diode, and a fourth diode;
the anode of the first diode and the cathode of the second diode are electrically connected with the first output end of the voltage regulating circuit;
the anode of the third diode and the cathode of the fourth diode are electrically connected with the second output end of the voltage regulating circuit;
the cathode of the first diode and the cathode of the third diode are electrically connected with one end of the load;
And the anode of the second diode and the anode of the fourth diode are electrically connected with the other end of the load.
Optionally, the rectifying circuit further includes: a filter capacitor;
The filter capacitor is connected in parallel with the load.
Optionally, in the same resonant conversion module, the resonant conversion module includes a plurality of bridge circuits, and a plurality of resonant circuits correspondingly electrically connected to each bridge circuit.
Optionally, in the same resonant conversion module, the resonant conversion module includes a plurality of bridge circuits and a plurality of resonant circuits correspondingly and electrically connected with the bridge circuits; the voltage regulating circuit comprises a plurality of input ports corresponding to the resonant circuits;
Each of the input ports is electrically connected with an output terminal of each of the resonant circuits.
Optionally, the voltage regulating circuit comprises a transformer; the transformer includes a plurality of primary coils corresponding to each of the resonant circuits,
Each primary coil is respectively and correspondingly and electrically connected with the output end of each resonant circuit.
In a second aspect, the invention provides a DC-DC converter comprising the multiphase resonant converter of the first aspect.
According to the technical scheme, the coupling inductors are respectively arranged in the resonant circuits of each resonant conversion module, the coupling inductors of the first resonant conversion module and the coupling inductors of the second resonant conversion module form the reverse full-coupling inductors, the coupling characteristics of the reverse full-coupling inductors are utilized to enable the current amplitude flowing through the first resonant conversion module to be equal to the current amplitude flowing through the second resonant conversion module, and then the currents of the first resonant conversion module and the second resonant conversion module are uniform, so that the first resonant conversion module and the second resonant conversion module can both provide the same current signals for loads, the controllability of load currents is improved, and by arranging the two resonant conversion modules, as the first loads and the second loads are connected in series, each resonant conversion module can only output half of total voltage required by the total load formed by the first loads and the second loads, so that the working voltage of the resonant conversion modules is reduced, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a multiphase resonant converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another multiphase resonant converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a multiphase resonant converter according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a multiphase resonant converter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a multiphase resonant converter according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another multiphase resonant converter according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a multiphase resonant converter according to an embodiment of the present invention;
Fig. 8 is a schematic diagram of waveforms of electrical signals in each circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a multiphase resonant converter according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a multiphase resonant converter according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of another multiphase resonant converter according to an embodiment of the present invention;
Fig. 12 is a schematic structural diagram of a reverse coupling inductor according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic structural diagram of a multiphase resonant converter according to an embodiment of the present invention, and fig. 12 is a schematic structural diagram of a reverse coupling inductor according to an embodiment of the present invention, referring to fig. 1 and fig. 12, the multiphase resonant converter includes two resonant conversion modules 1; each resonant conversion module 1 comprises a bridge circuit 11, a resonant circuit 12, a voltage regulating circuit 13 and a rectifying circuit 14; the input end of the bridge circuit 11 is electrically connected with the power supply 2, the output end of the bridge circuit 11 is electrically connected with the resonant circuit 12, and the bridge circuit 11 is used for converting a power supply signal provided by the power supply 2 into an alternating current signal and transmitting the alternating current signal to the resonant circuit 12; the resonance circuit 12 is electrically connected between the output end of the bridge circuit 11 and the input end of the voltage regulating circuit 13, and the resonance circuit 12 is used for carrying out resonance conversion on the alternating current signal and then outputting the resonance signal to the voltage regulating circuit 13; the voltage regulating circuit 13 is used for outputting a voltage regulating signal to the input end of the rectifying circuit 14 after performing voltage regulation on the resonance signal; the output end of the rectifying circuit 14 is electrically connected with a load, and the rectifying circuit 14 is used for converting the voltage regulating signal into a direct current signal and transmitting the direct current signal to the load; the resonant circuit 12 at least comprises a coupling inductance L0, the two resonant conversion modules 1 are a first resonant conversion module 101 and a second resonant conversion module 102 respectively, and the coupling inductance L0 of the first resonant conversion module 101 and the coupling inductance L0 of the second resonant conversion module 102 form a reverse full-coupling inductor L0c; the load electrically connected to the first resonant conversion module 101 is a first load Ro1, the load electrically connected to the second resonant conversion module 102 is a second load Ro2, the first load Ro1 and the second load Ro2 are connected in series, the node at which the first load Ro1 and the second load Ro2 are electrically connected is a first node O1, and the first node O1 is grounded.
The resonant conversion module 1 is configured to convert a dc power supply signal into a dc signal required by a load, where the power supply signal includes a voltage signal or a current signal, and since the voltage signal and the current signal of the dc power supply are unchanged, no device is currently available that can directly convert one dc signal into another dc signal, and one dc signal needs to be converted into an ac signal by the resonant conversion module, and then the ac signal is converted into another dc signal, so as to convert one dc signal into another dc signal.
Specifically, the power supply 2 includes a power supply device such as a battery pack, for providing a dc power supply signal, the bridge circuit 11 is configured to convert the power supply signal provided by the power supply 2 into an ac signal, the specific structure of the bridge circuit 11 may be set according to actual needs, for example, the bridge circuit 11 includes a full bridge circuit or a half bridge circuit, etc. to convert the power supply signal into different ac signals, the ac signal output by the bridge circuit 11 is subjected to resonance conversion by the resonance circuit 12 and then outputs a stable resonance signal to the voltage regulator 13, the resonance circuit 12 may include a resonance device such as a capacitor and/or an inductor, and may be set according to actual needs, where the voltage regulator 13 may include a voltage regulator member to boost or buck the input resonance signal, if the dc signal required by the load is greater than the power supply signal provided by the power supply 2, the voltage regulator 13 is required to boost the resonance signal, so that after the rectification circuit 14 converts the voltage regulator signal into the dc signal, the converted dc signal may meet the working needs of the load; if the dc signal required by the load is smaller than the power supply signal provided by the power supply 2, the voltage regulating circuit 13 is required to perform voltage reduction processing on the resonant signal, so that after the rectifying circuit 14 converts the voltage regulating signal into the dc signal, the converted dc signal can meet the working requirement of the load.
On this basis, by making the resonant circuit 12 in each resonant transformation module 1 include the coupling inductance L0, the coupling inductance L01 in the first resonant transformation module 101 and the coupling inductance L02 in the second resonant transformation module 102 constitute a reverse full-coupling inductor, so that when the current I Lr1 flows through the coupling inductance L01 and the current I Lr2 flows through the coupling inductance L02, the reverse full-coupling inductor can constitute a differential-mode inductance, the non-uniform portions of the currents are mutually coupled to cancel, and thus the current I Lr1 flowing through the coupling inductance L01 and the current I Lr2 flowing through the coupling inductance L02 are equal in magnitude, so that the currents flowing through the two resonant transformation modules 1 are uniform, so that the two resonant transformation modules 1 can output direct-current signals having the same current magnitude, the first load Ro1 and the second load Ro2 are connected in series, so that the current flowing through the first load Ro1 is consistent with the current flowing through the second load Ro2 in size and direction, the first load Ro1 and the second load Ro2 form a total load, a first node of the first load Ro1 electrically connected with the second load Ro2 is grounded, each resonant conversion module 1 can only provide half of the voltage required by the total load for the first load Ro1 or the second load Ro2, the working voltage level of the output end of the voltage regulating circuit 13 and the rectifying circuit 14 in each resonant conversion module 1 is reduced, the cost is saved, the whole volume of the rectifying circuit 14, close to the load side, of the resonant conversion module 1 is smaller, the electric connection circuit between the rectifying circuit 14 and the load is shortened, and the power utilization rate output to the load is improved.
According to the technical scheme, the coupling inductors are respectively arranged in the resonant circuits of each resonant conversion module, the coupling inductors of the first resonant conversion module and the coupling inductors of the second resonant conversion module form reverse full-coupling inductors, the coupling characteristics of the reverse full-coupling inductors are utilized to enable the current amplitude flowing through the first resonant conversion module to be equal to the current amplitude flowing through the second resonant conversion module, and then the currents of the first resonant conversion module and the second resonant conversion module are uniform, so that the first resonant conversion module and the second resonant conversion module can both provide the same current signals for loads, the controllability of load currents is improved, and due to the fact that the two resonant conversion modules are arranged, only half of total voltage required by the total load formed by the first load and the second load can be output by each resonant conversion module, so that the working voltage of the resonant conversion module is reduced, and the cost is reduced.
Optionally, fig. 2 is a schematic structural diagram of another multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 2, a bridge circuit 11 includes a first MOS transistor S1, a second MOS transistor S2, a third MOS transistor S3, and a fourth MOS transistor S4; the first pole of the first MOS tube S1 and the first pole of the third MOS tube S3 are electrically connected with the positive pole of the power supply 2, and the second pole of the first MOS tube S1 and the first pole of the second MOS tube S2 are electrically connected with the first input end of the resonant circuit 12; the second pole of the third MOS tube S3 and the first pole of the fourth MOS tube S4 are electrically connected with the second input end of the resonant circuit 12; the second pole of the second MOS tube S2 and the second pole of the fourth MOS tube S4 are electrically connected with the negative pole of the power supply 2; the first MOS tube S1 and the fourth MOS tube S4 are conducted simultaneously, and the second MOS tube S2 and the third MOS tube S3 are conducted simultaneously; the first MOS tube S1 and the second MOS tube S2 are conducted in a time sharing mode.
The specific types of the first MOS transistor S1, the second MOS transistor S2, the third MOS transistor S3, and the fourth MOS transistor S4 may be set according to actual needs, for example, the first MOS transistor S1, the second MOS transistor S2, the third MOS transistor S3, and the fourth MOS transistor S4 are all N-channel enhancement type MOS transistors, all N-channel depletion type MOS transistors, all P-channel enhancement type MOS transistors, or all P-channel depletion type MOS transistors, which are not specifically limited herein.
Specifically, the on time of the first MOS transistor S1, the second MOS transistor S2, the third MOS transistor S3, and the fourth MOS transistor S4 may be controlled, so that the full-bridge circuit 11 may convert a dc power signal input by the power supply 2 into an ac signal, and the on or off of each MOS transistor may be controlled by a pulse width modulation circuit (not shown in the drawing) electrically connected to the first MOS transistor S1, the second MOS transistor S2, the third MOS transistor S3, and the fourth MOS transistor S4, so that the full-bridge circuit 11 outputs an ac waveform, and when the first MOS transistor S1 and the fourth MOS transistor S4 are controlled to be simultaneously turned on in a first half period, and when the second MOS transistor S2 and the third MOS transistor S3 are simultaneously turned off, the power supply signal provided by the power supply 2 may output a positive half period of ac signal through the first MOS transistor S1 and the fourth MOS transistor S4; when the second MOS transistor S2 and the third MOS transistor S3 are controlled to be turned on simultaneously and the first MOS transistor S1 and the fourth MOS transistor S4 are controlled to be turned off simultaneously in the second half period, the power supply signal provided by the power supply 2 can output an alternating current signal of the negative half period after passing through the second MOS transistor S2 and the third MOS transistor S3. Therefore, the first MOS transistor and the second MOS transistor can be controlled to conduct in a time-sharing manner in one period, and then an ac signal is output to the resonant circuit 12.
Optionally, fig. 3 is a schematic structural diagram of still another multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 3, the resonant circuit 12 further includes a series resonant capacitor Cr, a parallel resonant capacitor Cp, and a resonant inductance Lr; one end of the series resonance capacitor Cr is electrically connected with the first output end of the bridge circuit 11, the other end of the series resonance capacitor Cr is electrically connected with one end of the coupling inductor L0, the other end of the coupling inductor L0 is electrically connected with one end of the resonance inductor Lr, and the other end of the resonance inductor Lr is respectively electrically connected with one end of the parallel resonance capacitor Cp and the first input end of the voltage regulating circuit 13; the other end of the parallel resonance capacitor Cp is electrically connected to the second output terminal of the bridge circuit 11 and the second input terminal of the voltage regulating circuit 13, respectively.
The series resonant capacitor Cr and the parallel resonant capacitor Cp include a ceramic capacitor, an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, or the like, the resonant inductor Lr includes a wire-wound inductor, a fixed inductor, or the like, and specific types of the series resonant capacitor Cr, the parallel resonant capacitor Cp, and the resonant inductor Lr may be set according to actual needs, which is not particularly limited herein.
Specifically, the resonant circuit 12 mainly filters out harmonics in the ac signal output by the bridge circuit 11 to output a stable sinusoidal ac signal to the voltage regulating circuit 13, and the resonant inductor Lr is formed by a wire wound on a magnetic material, and when a current flows through the wire, a magnetic field is generated around the wire, and the magnetic field interacts with an electric field in the capacitor, so that electric energy in the circuit is converted back and forth between the inductor and the capacitor. The resonant inductor Lr is used for storing electric energy and transmitting the electric energy to the capacitor, the resonant capacitor is formed by insulating materials isolated between two conductors, when voltage is applied to the capacitor, an electric field is generated between the two conductors, the resonant capacitor is used for storing the electric energy and transmitting the electric energy to the resonant inductor, when the resonant inductor Lr is electrically connected with the series resonant capacitor Cr and then is connected with the parallel resonant capacitor Cp in parallel, the resonant inductor Lr, the series resonant capacitor Cr and the parallel resonant capacitor Cp form a resonant circuit, when the energy conversion between the resonant inductor and the resonant capacitor reaches the maximum, the current and the voltage in the resonant circuit 12 can swing back and forth with the maximum amplitude, the amplitude is related to the inductance value of the resonant inductor Lr, and the capacitance values of the series resonant capacitor Cr and the parallel resonant capacitor Cp can be selected according to practical requirements, so as to realize a corresponding resonant effect.
The resonant circuit 12 operates as follows: when the resonant circuit 12 starts to receive an ac signal, a current in the resonant circuit 12 starts to flow, and a magnetic field is generated in the resonant inductor Lr, which interacts with an electric field in the series resonant capacitor Cr and the parallel resonant capacitor Lr, so that electric energy is converted back and forth among the resonant inductor Lr, the series resonant capacitor Cr, and the parallel resonant capacitor Cp, and during the conversion of electric energy, the resonant inductor Lr stores energy and transmits it to the series resonant capacitor Cr and the parallel resonant capacitor Cp, and the series resonant capacitor Cr and the parallel resonant capacitor Cp store energy after receiving the energy and transmit the energy back to the resonant inductor Lr, and the above process is repeated until the energy loss in the resonant circuit 12 is completed or an external condition is changed. The resonant circuit 12 has a resonant effect through the interaction between the resonant inductance and the resonant capacitance, so that the resonant circuit 12 outputs a stable ac resonant signal to the voltage regulating circuit 13 after performing resonance conversion on an input ac signal.
Optionally, fig. 4 is a schematic structural diagram of still another multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 4, where the voltage regulating circuit 13 includes a transformer T; the primary winding T1 of the transformer T is electrically connected to the output of the resonant circuit 12, and the secondary winding T2 of the transformer T is electrically connected to the input of the rectifier circuit 14.
The transformer T may be a dry transformer, an oil-immersed transformer, or the like, and may be selected according to actual needs, and is not particularly limited herein.
Specifically, the transformer T includes a step-up transformer or a step-down transformer, if the dc signal required by the load is greater than the power supply signal provided by the power supply 2, the transformer T steps up the resonant signal, the number of turns of the primary coil T1 is smaller than that of the secondary coil T2, the specific turns ratio can be set according to actual needs, so that the transformer T steps up the resonant signal and outputs a voltage regulation signal to the rectifying circuit 14, and the rectifying circuit 14 converts the voltage regulation signal into a dc signal capable of meeting the working needs of the load; if the dc signal required by the load is smaller than the power supply signal provided by the power supply 2, the transformer T steps down the resonant signal, the number of turns of the primary coil T1 is greater than that of turns of the secondary coil T2, and the specific turns ratio can be set according to the actual requirement, so that the transformer T steps down the resonant signal and outputs a voltage-regulating signal to the rectifying circuit 14, and the rectifying circuit 14 converts the voltage-regulating signal into a dc signal capable of meeting the working requirement of the load. In addition, the transformer T can isolate the electric signal on the primary coil T1 side from the electric signal on the secondary coil T2 side, so as to prevent the interference signal in the electric signal on the primary coil T1 (or the secondary coil T2) side from being transmitted to the secondary coil T2 (or the primary coil T1) side, and improve the anti-interference performance and stability of the electric signal output to the load.
Optionally, fig. 5 is a schematic structural diagram of a multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 5, the rectifying circuit 14 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the anode of the first diode D1 and the cathode of the second diode D2 are electrically connected with the first output end of the voltage regulating circuit 13; the anode of the third diode D3 and the cathode of the fourth diode D4 are electrically connected with the second output end of the voltage regulating circuit 13; the cathode of the first diode D1 and the cathode of the third diode D3 are electrically connected with one end of a load; the anode of the second diode D2 and the anode of the fourth diode D4 are both electrically connected to the other end of the load.
The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 include germanium diodes or silicon diodes, which may be set according to actual needs, and are not specifically limited herein.
Specifically, the diode has the characteristics of forward conduction and reverse cut-off, that is, current can only flow from the anode of the diode to the cathode of the diode, but cannot flow from the cathode of the diode to the anode. By utilizing the forward on and reverse off characteristics of the diodes and adopting the electric connection mode, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 form a full-bridge rectifying circuit 14, and the working principle of the rectifying circuit 14 is as follows: when the voltage regulating signal Ui1 input to the input end of the rectifying circuit 14 is greater than or equal to zero (positive half cycle), the first diode D1 and the fourth diode D4 are forward conducted, the second diode D2 and the third diode D3 are reverse cut off, the current flows through the first diode D1 through the first load Ro1, and then flows through the fourth diode D4 from Ro1 and returns to the voltage regulating circuit 13, and the voltage U R1 at two ends of the first load Ro1 in the process is greater than zero; when the voltage regulating signal Ui1 input to the input end of the rectifying circuit 14 is less than or equal to zero (negative half cycle), the first diode D1 and the fourth diode D4 are turned off reversely, the second diode D2 and the third diode D3 are turned on in the forward direction, the current flows through the first load Ro1 by the third diode D3, and then flows through the second diode D2 by Ro1 and returns to the voltage regulating circuit 13, and the voltage U R1 at two ends of the first load Ro1 is still greater than zero in the process. Thus, the above operation is repeatedly performed, and the first load Ro1 can obtain the full-wave rectified voltage.
Optionally, fig. 6 is a schematic structural diagram of another multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 6, the rectifying circuit 14 further includes a filter capacitor Co; the filter capacitor Co is connected in parallel with the load.
The filter capacitor Co includes a ceramic capacitor, an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, or the like, and may be set according to actual needs, which is not particularly limited herein.
Specifically, on the basis that the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 can rectify the ac voltage-regulating signal output by the voltage-regulating circuit 13 and then output a dc signal, a filter capacitor Co may be disposed in parallel at two ends of the load, to filter ac components in the dc signal output to the load end, to reduce ac ripple coefficient, and further to make the dc signal output to the load Ro smoother, the filtering process is implemented by charging and discharging the filter capacitor Co, and when the dc voltages of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 output to the filter capacitor Co are higher than the voltage of the filter capacitor Co, the filter capacitor Co is in a charging state, and when the dc voltages of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 output to the filter capacitor Co are lower than the voltage of the filter capacitor Co, the filter capacitor Co is in a discharging state. Thus, by setting the filter capacitor Co, the filter capacitor Co can absorb current fluctuation and interference generated in the working process of the rectifying circuit 14 well, so that the direct current signal output to the load Ro is stable and smooth, and the working stability of the multiphase resonant converter is improved.
It can be understood that the capacitance value of the filter capacitor Co1 in the rectifying circuit 14 of the first resonant conversion module 101 is equal to that of the filter capacitor Co2 in the rectifying circuit 14 of the second resonant conversion module 102, so that the first resonant conversion module 101 and the second resonant conversion module 102 output the same dc signal, and the series connection reliability of the first load Ro1 and the second load Ro2 is improved.
Fig. 7 is a schematic structural diagram of another multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 7, a bridge circuit 11 includes a first MOS transistor S1, a second MOS transistor S2, a third MOS transistor S3, and a fourth MOS transistor S4, a resonant circuit 12 includes a series resonant capacitor Cr, a parallel resonant capacitor Cp, a resonant inductor Lr, and a coupling inductor L01 or L02, a voltage regulating circuit 13 includes a transformer T, and a rectifying circuit 14 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a filter capacitor Co.
The parameters and types of the corresponding components in the first resonant conversion module 101 and the second resonant conversion module 102 are the same, so that the first resonant conversion module 101 and the second resonant conversion module 102 can output the same direct current signal.
Specifically, with the use of the multiphase resonant converter, the resonant capacitance or resonant inductance parameter in each resonant conversion module 1 may change to different degrees, so that the direct current signals output by each resonant conversion module are inconsistent.
It will be appreciated that the rectifier circuit 14 in the first resonant conversion module 101 may be integrated with the rectifier circuit 14 in the second resonant conversion module 102 in the same circuit board or integrated device to reduce the overall structure of the multiphase resonant converter.
Fig. 8 is a schematic diagram of waveforms of electrical signals in each circuit provided by the embodiment of the present invention, referring to fig. 7 and 8,U R2, where U R1 is a voltage across the second load Ro2, U R2 is a voltage across the second load Ro2, I R1 is a current flowing through the first load Ro1, I R2 is a current flowing through the second load Ro2, vcp is a voltage signal at an input end of the voltage regulating circuit 13, and S2 (S3)/V, S2 (S3)/V represents pulse signals applied to the first MOS transistor S1, the second MOS transistor S2, the third MOS transistor S3 and the fourth MOS transistor S4 in the first resonant conversion module 101 or the second resonant conversion module 102; i Lr1 is a current signal flowing through a resonant inductor in the first resonant conversion module 101, I Lr2 is a current signal flowing through a resonant inductor in the second resonant conversion module 102, and I Lr1 and I Lr2 have equal current amplitudes at the same time, so that the current signals output by the first resonant conversion module 101 and the second resonant conversion module 102 are the same, the uniformity of the current output to a load is improved, and the working stability of the load is improved.
Optionally, fig. 9 is a schematic structural diagram of still another multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 9, in the same resonant conversion module 1, the resonant conversion module 1 includes a plurality of bridge circuits 11, and a plurality of resonant circuits 12 correspondingly electrically connected to each bridge circuit 11.
Specifically, when the load needs larger input power, the output end of each resonant circuit 12 and the input end of the voltage regulating circuit 13 may be connected in parallel, so that when each resonant circuit 12 outputs the same voltage signal, the sum of currents output by each resonant circuit 12 is input into the voltage regulating circuit 13, and further the input power of the voltage regulating circuit 13 is increased, according to the law of conservation of energy, the voltage regulating signal output to the rectifying circuit 14 after the voltage regulating circuit 13 performs voltage regulation on the resonant signal has larger power, the voltage regulating signal is converted into a direct current signal by the rectifying circuit 14 and also has larger power energy, and the power energy output to the load is increased, so as to meet the working requirement of the load.
Optionally, fig. 10 is a schematic structural diagram of a multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 10, in the same resonant conversion module 1, the resonant conversion module 1 includes a plurality of bridge circuits 11, and a plurality of resonant circuits 12 correspondingly electrically connected to each bridge circuit 11; the voltage regulating circuit 13 includes a plurality of input ports corresponding to the respective resonant circuits 12; each input port is electrically connected to an output of each resonant circuit 12.
Specifically, when a load needs a larger input power, the output end of each resonant circuit 12 may be electrically connected to each input port of the voltage regulating circuit 13, so that when each resonant circuit 12 outputs the same voltage signal to the voltage regulating circuit 13, the voltage signal at the input side of the voltage regulating circuit 13 is the sum of the output voltages of each resonant circuit 12, the sum of the voltages output by each resonant circuit 12 is boosted or reduced by the voltage regulating circuit 13 and then input into the rectifying circuit 14, the voltage regulating signal output by the voltage regulating circuit 13 after the voltage regulation of the resonant signals output by each resonant circuit 12 has a larger power according to the law of conservation of energy, and the voltage regulating signal is converted into a direct current signal by the rectifying circuit 14 to have a larger power energy, so that the power energy output to the load is increased, thereby meeting the working requirement of the load.
Optionally, fig. 11 is a schematic structural diagram of another multiphase resonant converter according to an embodiment of the present invention, as shown in fig. 11, where the voltage regulating circuit 13 includes a transformer T; the transformer T includes a plurality of primary coils T1 corresponding to the respective resonant circuits 12, and each primary coil T1 is electrically connected to an output terminal of each resonant circuit 12. In this way, the transformer T includes the plurality of primary coils T1, so that the transformer T includes an input port, each resonant circuit 12 is electrically connected with each primary coil T1, so as to increase a voltage signal at an input side of the transformer T, so that an adjustment voltage after the transformer T boosts a sum of resonant signals input by the resonant circuits 12 is increased, and a direct current signal converted by the voltage adjustment signal through the rectifying circuit 14 has larger power energy, so that the power energy output to a load is increased, thereby meeting a working requirement of the load.
Based on the same inventive concept, the embodiments of the present invention also provide a DC-DC converter including the multiphase resonant converter provided by any one of the embodiments of the present invention. Therefore, the DC-DC converter has the technical characteristics of the multiphase resonant converter provided by the embodiment of the present invention, so that the beneficial effects of the multiphase resonant converter provided by the embodiment of the present invention can be achieved, and the same points can be referred to the description of the multiphase resonant converter provided by the embodiment of the present invention, and are not repeated herein.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A multiphase resonant converter, comprising: two resonant transformation modules;
each resonant conversion module comprises a bridge circuit, a resonant circuit, a voltage regulating circuit and a rectifying circuit;
The input end of the bridge circuit is electrically connected with a power supply, the output end of the bridge circuit is electrically connected with the resonant circuit, and the bridge circuit is used for converting a power supply signal provided by the power supply into an alternating current signal and transmitting the alternating current signal to the resonant circuit;
The resonant circuit is electrically connected between the output end of the bridge circuit and the input end of the voltage regulating circuit, and is used for outputting a resonant signal to the voltage regulating circuit after carrying out resonant conversion on the alternating current signal;
the voltage regulating circuit is used for outputting a voltage regulating signal to the input end of the rectifying circuit after carrying out voltage regulation on the resonance signal;
The output end of the rectifying circuit is electrically connected with a load, and the rectifying circuit is used for converting the voltage regulating signal into a direct current signal and transmitting the direct current signal to the load;
The resonant circuit at least comprises a coupling inductor, wherein the two resonant conversion modules are a first resonant conversion module and a second resonant conversion module respectively, and the coupling inductor of the first resonant conversion module and the coupling inductor of the second resonant conversion module form a reverse full-coupling inductor;
the load electrically connected with the first resonance transformation module is a first load, the load electrically connected with the second resonance transformation module is a second load, the first load and the second load are connected in series, the node electrically connected with the first load and the second load is a first node, and the first node is grounded.
2. The multiphase resonant converter of claim 1, wherein the bridge circuit comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor;
the first electrode of the first MOS tube and the first electrode of the third MOS tube are electrically connected with the positive electrode of the power supply, and the second electrode of the first MOS tube and the first electrode of the second MOS tube are electrically connected with the first input end of the resonant circuit;
the second pole of the third MOS tube and the first pole of the fourth MOS tube are electrically connected with the second input end of the resonant circuit;
the second pole of the second MOS tube and the second pole of the fourth MOS tube are electrically connected with the negative pole of the power supply;
the first MOS tube and the fourth MOS tube are conducted simultaneously, and the second MOS tube and the third MOS tube are conducted simultaneously; the first MOS tube and the second MOS tube are conducted in a time-sharing mode.
3. The multiphase resonant converter of claim 1 wherein the resonant circuit further comprises: a series resonant capacitor, a parallel resonant capacitor and a resonant inductor;
One end of the series resonance capacitor is electrically connected with the first output end of the bridge circuit, the other end of the series resonance capacitor is electrically connected with one end of the coupling inductor, the other end of the coupling inductor is electrically connected with one end of the resonance inductor, and the other end of the resonance inductor is respectively electrically connected with one end of the parallel resonance capacitor and the first input end of the voltage regulating circuit;
The other end of the parallel resonance capacitor is electrically connected with the second output end of the bridge circuit and the second input end of the voltage regulating circuit respectively.
4. The multiphase resonant converter of claim 1, wherein the voltage regulating circuit comprises: a transformer;
The primary coil of the transformer is electrically connected with the output end of the resonant circuit, and the secondary coil of the transformer is electrically connected with the input end of the rectifying circuit.
5. The multiphase resonant converter of claim 1, wherein the rectifying circuit comprises: a first diode, a second diode, a third diode, and a fourth diode;
the anode of the first diode and the cathode of the second diode are electrically connected with the first output end of the voltage regulating circuit;
the anode of the third diode and the cathode of the fourth diode are electrically connected with the second output end of the voltage regulating circuit;
the cathode of the first diode and the cathode of the third diode are electrically connected with one end of the load;
And the anode of the second diode and the anode of the fourth diode are electrically connected with the other end of the load.
6. The multiphase resonant converter of claim 5, wherein the rectifying circuit further comprises: a filter capacitor;
The filter capacitor is connected in parallel with the load.
7. The multiphase resonant converter of claim 1 wherein said resonant conversion module comprises a plurality of bridge circuits, a plurality of resonant circuits electrically connected to each of said bridge circuits.
8. The multiphase resonant converter of claim 1 wherein, in the same resonant conversion module, the resonant conversion module comprises a plurality of bridge circuits, a plurality of resonant circuits in corresponding electrical connection with each of the bridge circuits; the voltage regulating circuit comprises a plurality of input ports corresponding to the resonant circuits;
Each of the input ports is electrically connected with an output terminal of each of the resonant circuits.
9. The multiphase resonant converter of claim 8 wherein the voltage regulation circuit comprises a transformer; the transformer includes a plurality of primary coils corresponding to each of the resonant circuits,
Each primary coil is respectively and correspondingly and electrically connected with the output end of each resonant circuit.
10. A DC-DC converter comprising a multiphase resonant converter according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410240717.7A CN118100636A (en) | 2024-03-04 | 2024-03-04 | Multiphase resonant converter and DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410240717.7A CN118100636A (en) | 2024-03-04 | 2024-03-04 | Multiphase resonant converter and DC-DC converter |
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| CN118100636A true CN118100636A (en) | 2024-05-28 |
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| CN202410240717.7A Pending CN118100636A (en) | 2024-03-04 | 2024-03-04 | Multiphase resonant converter and DC-DC converter |
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- 2024-03-04 CN CN202410240717.7A patent/CN118100636A/en active Pending
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