WO2017118432A1

WO2017118432A1 - Direct-current multi-input and single-output resonant converter and control method therefor

Info

Publication number: WO2017118432A1
Application number: PCT/CN2017/070509
Authority: WO
Inventors: 王恰
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-01-07
Filing date: 2017-01-06
Publication date: 2017-07-13
Also published as: CN106953526A

Abstract

Disclosed are a direct-current multi-input and single-output resonant converter and a control method therefor, which relate to the field of resonant converters. The converter comprises: one or more parallel resonant conversion coupling pairs and an output filtering circuit, wherein each resonant conversion coupling pair is connected to the output filtering circuit in series; each resonant conversion coupling pair comprises two sets of resonant conversion circuits; the resonant conversion circuits comprise resonant circuits and rectifying circuits; in each resonant conversion coupling pair, the resonant circuits are coupled to the rectifying circuits via a transformer; and the two resonant circuits in each resonant conversion coupling pair are coupled via an inductor. In the present invention, the quantity of used magnetic devices is fewer, the quantity of magnetic devices can be reduced, the volume of a device is reduced and the power density is improved.

Description

DC multi-input single-output resonant converter and control method thereof

Technical field

The present disclosure relates to the field of resonant converters, for example, to a DC multiple input single output resonant converter and a control method therefor.

Background technique

With the development of modern power electronics technology and power switching device technology, the efficiency and power density requirements of switching power supplies are getting higher and higher. How to improve the efficiency of switching power supplies and reduce the size of switching power supplies has gradually become a research trend.

At present, multi-input and single-output resonant converters mostly use multi-channel LLC resonant converter circuits for interleaving and parallel operation. Such converters have the advantages of high conversion efficiency, good current sharing effect, and low output ripple noise, but due to interleaving and parallel connection. There are many roads. Each of the LLC resonant circuits has two magnetic components, a resonant inductor and a resonant transformer. This results in a large number of magnetic devices in the overall circuit. It is difficult to miniaturize the converter and it is difficult to increase the power density.

Summary of the invention

The present disclosure provides a DC multi-input single-output resonant converter and a control method thereof, so that the resonant converter has the characteristics of high efficiency and high power density.

The technical solutions adopted by the present disclosure are as follows:

A DC multi-input single-output resonant converter comprising:

One or more pairs of parallel resonant transform coupling pairs and output filter circuits, each pair of said resonant transform coupling pairs being in series with said output filter circuit, each pair of said resonant transform coupling pairs comprising two sets of resonant converter circuits, said resonance The transform circuit includes a resonant circuit and a rectifying circuit; the resonant circuit and the rectifying circuit of each pair of the resonant transform coupling pairs are coupled by a transformer, and two of the pair of resonant conversion coupling pairs are inductively coupled.

The output filter circuit can include a filter capacitor and an output load, the filter capacitor being in parallel with the output load.

The coupling of the resonant circuit and the rectifying circuit in each pair of the resonant transform coupling pairs by a transformer may mean:

The transformer winding of the resonant circuit of each pair of the resonant conversion coupling pair and the transformer winding of the rectifier circuit are wound on the same magnetic core to form an integrated transformer.

Inductive coupling of two resonant circuits of each pair of said resonantly coupled coupling pairs can be:

The inductive windings of the two resonant circuits of each pair of the resonant transform coupling pairs are wound on the same magnetic core to form an integrated inductor.

The resonant circuit can include one of the following:

Half-bridge LLC resonant circuit, diode clamped half-bridge resonant circuit, full-bridge LLC resonant circuit.

The rectifier circuit may include a full bridge rectifier circuit or a full wave rectifier circuit.

In order to solve the above technical problem, the present disclosure further provides a control method of the above converter, including:

The phases of the operating voltages input to each resonant circuit are sequentially interleaved by 360o/N, which is the number of resonant circuits;

The phases of the operating voltages input to the two resonant circuits of each pair of said resonantly-transformed coupled pairs are 180° out of phase.

The two switching tubes that control each resonant circuit can be alternately turned on.

The magnitude of the operating voltage input to each resonant circuit can be equal.

The present disclosure also provides a non-transitory computer readable storage medium storing computer executable instructions arranged to perform the above method.

The present disclosure also provides an electronic device, including:

At least one processor;

a memory communicatively coupled to the at least one processor; wherein

The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the method described above.

Compared with the related art, the present disclosure has the following beneficial effects:

The DC multi-input single-output resonant converter provided by the present disclosure and the control method thereof are compared with each channel Vertical multi-input single-output DC converters use fewer magnetic components to reduce the number of magnetic components, reduce device size, and increase power density.

BRIEF abstract

1 is a schematic diagram of input voltages of a control method of a DC multiple-input single-output resonant converter according to an embodiment of the present disclosure;

2 is a schematic diagram of a DC multiple input single output resonant converter according to an embodiment of the present disclosure;

3 is a schematic diagram of a three-DC multiple-input single-output resonant converter according to an embodiment of the present disclosure;

4 is a schematic diagram of a four-DC multiple-input single-output resonant converter according to an embodiment of the present disclosure;

5 is a schematic diagram of a five-DC multiple-input single-output resonant converter according to an embodiment of the present disclosure;

6 is a schematic diagram of a six-DC multiple-input single-output resonant converter according to an embodiment of the present disclosure;

7 is a schematic diagram of a DC multiple input single output resonant converter according to Embodiment 7 of the present disclosure;

8 is a schematic diagram of a DC multiple input single output resonant converter according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of an electronic device provided by the present disclosure.

detailed description

In order to make the technical solutions and the beneficial effects of the present disclosure more clear, the embodiments of the present disclosure will be described below with reference to the accompanying drawings, and the features in the embodiments and the embodiments in the present disclosure are not described. Can be combined with each other.

As shown in FIG. 1 and FIG. 2, an embodiment of the present disclosure provides a DC multi-input single-output resonant converter, including:

The output filter circuit includes a filter capacitor and an output load, and the filter capacitor is connected in parallel with the output load.

The coupling of the resonant circuit and the rectifying circuit in each pair of the resonant transform coupling pairs through a transformer means:

Inductive coupling of two resonant circuits in each pair of said resonantly coupled coupling pairs means:

The resonant circuit includes one of the following:

The LLC resonant circuit is an avatar representation of the component structure, including two inductors (L) and one capacitor (C) to generate resonance.

The rectifier circuit includes a full bridge rectifier circuit or a full wave rectifier circuit.

As shown in FIGS. 1 and 2, an embodiment of the present disclosure further provides a control method for a DC multiple input single output resonant converter, including:

Wherein, the two switching tubes of each resonant circuit are alternately turned on, and the operating voltages input to each resonant circuit are equal in amplitude.

Embodiment 1

As shown in FIG. 1 , a multi-input single-output direct current (DC/DC) resonant converter proposed by an embodiment of the present disclosure, wherein the resonant circuit includes but is not limited to an LLC resonant circuit, and the LLC resonant circuit series topology includes a common half bridge type. With diode clamped half-bridge, full-bridge, rectifier circuit can use full-bridge rectifier circuit or full-wave rectifier circuit.

In the embodiment of the present disclosure, the resonant circuit is a half-bridge LLC resonant circuit, and the rectifying circuit uses a full-wave rectifying circuit as an example to illustrate the embodiment. The resonant converter includes N independent DC input sources (N is an integer multiple of 2), N LLC resonant converter primary circuits, and secondary rectifier circuits. The N DC input sources are: Vin1, Vin2, ..., VinN, and the amplitudes of the N independent DC input sources are equal, each DC input source is connected to one half bridge LLC resonant circuit, and N half bridge AC resonant circuit The secondary rectifier circuit works in parallel, and the output terminal is connected with a filter capacitor CO and an output load RO. Each half-bridge LLC resonant circuit is sequentially interleaved with 360o/N, and the switch tube upper tube in each half-bridge LLC resonant circuit works. The voltage is: V1, V3, ..., V2N-1. The operating voltage of the lower tube of the switch tube in each half-bridge LLC resonant circuit is: V2, V4, ..., V2N, and the timing diagram of the driving signals of all the switching tubes is as shown in the figure. 1 is shown.

In the circuit, the switching tubes V1 and V2 are alternately turned on, and V3 and V4 are alternately turned on, and the VN-1 and VN are alternately turned on. The phase difference between Vin1 and VinN/2+1 is 180o, and the phase difference between Vin2 and VinN/2+2 is 180o. Thus, the N-channel LLC resonant circuit is divided into N/2 pairs of resonant transformations with phase difference of 180o. Correct. Coupling N/2 to the resonant transform coupling pair of resonant inductor windings in each pair on the same core to form integrated inductors L1, L2, ..., VN/2; coupling N/2 to the resonant transform coupling pair The transformer windings are wound on the same core to form integrated transformers T1, T2, ..., TN/2. Each half-bridge LLC resonant circuit is connected to a full-wave rectifying circuit. The output ends of each full-wave rectifying circuit are connected in parallel, and the output is filtered by an output capacitor CO. The output load is RO and the output voltage is VO.

The resonant inductances in each LLC resonant circuit are: Lr1, Lr2, ..., LrN. The excitation inductance of the transformer in each LLC resonant circuit is: Lm1, Lm2, ..., LmN, according to the working principle of LLC resonant circuit, resonance The currents in the inductors Lr1 and LrN/2+1 are sinusoidal AC ripple currents, and the currents in the two resonant inductors are 180° out of phase. The currents in the magnetizing inductances Lm1 and LmN/2+1 are sinusoidal AC ripple currents, and the phases of the currents in the two magnetizing inductors differ by 180o. Using the above phase relationship, the two independent resonant inductors Lr1 and LrN/2+12 in the original circuit are integrated into one magnetic core to form the inductor L1, and the resonant inductors Lr1 and LrN/2+1 are equivalent to operate in series, and two independent The transformer is integrated into a transformer T1, and the magnetizing inductances Lm1 and LmN/2+1 are equivalently connected in series. The two secondary windings of the transformer are connected to one rectifier circuit in parallel to provide an output voltage VO.

Embodiment 2

As shown in Figure 2, the converter consists of two separate and identical DCs of equal magnitude. The input sources Vin1 and Vin2, the two-way half-bridge LLC resonant circuit, the secondary of each half-bridge LLC resonant circuit is connected with a full-wave rectifying circuit, and the outputs of the two-way full-wave rectifying circuits are connected in parallel. The amplitudes of Vin1 and Vin2 are both 1/2 of the voltage of the conventional rectifier bus. The primary of transformer T1 is a two-bridge LLC resonant circuit with two parallel circuits. The secondary of T1 is a two-way parallel full-wave rectification circuit. The two half-bridge LLC resonant circuits have resonant inductors Lr1 and Lr2, respectively. The primary winding of transformer Lm1 And Lm2. The phase of the two-way half-bridge LLC resonant circuit is 180o, and the two inductors can be wound on the same inductor core to form an integrated resonance by using the relationship of the currents of the two resonant inductors Lr1 and Lr2 with the same phase difference of 180o. The inductor L1 reduces the number of magnetic components, reduces the volume of the power device, and increases the power density. Similarly, the currents in the primary windings Lm1 and Lm2 of the transformer also have the same relationship. The magnitudes of the currents are equal to each other by 180o. By using this relationship, Lm1 and Lm2 are wound in the same transformer core to form the primary winding of the integrated transformer T1. The currents in the secondary windings of the two-way LLC resonant converter transformer are equal in phase by 180o, and the two secondary windings are simultaneously wound at the secondary of T1 to form the secondary winding of the integrated transformer T1, each set of secondary windings. A full-wave rectification circuit is connected separately and then connected in parallel, which can also reduce the number of magnetic devices and increase the power density.

Embodiment 3

The difference from the second embodiment is that in this embodiment, there are N independent DC input sources with independent amplitudes, N is an integer multiple of 2, and each DC input source is connected to one half-bridge LLC resonant circuit, and each half-bridge LLC The transformer secondary of the resonant circuit is connected to a full-wave rectifying circuit, and the outputs of all the full-wave rectifying circuits are output in parallel. The amplitude of the independent DC input source is 1/N of the voltage of the conventional rectifier bus. The half-bridge LLC circuit connected to each DC input source has a phase difference of 360o/N, and the inductor and the transformer in the two-way LLC resonant circuit with phase difference of 180o are respectively integrated into one inductor and transformer, and the integrated converter has N/2 resonant inductors and N/2 transformers are shown in Figure 3.

Embodiment 4

The difference from the second embodiment is that, in this embodiment, there are N independent DC input sources with independent amplitudes, N is an integer multiple of 2, and each DC input source is connected to a diode clamped half bridge LLC resonant circuit. The secondary of a half-bridge LLC resonant circuit with diode clamp is connected to a full-wave rectifier circuit. The outputs of all full-wave rectifier circuits are connected in parallel. The amplitude of the independent DC input source is 1 of the conventional rectifier bus voltage. /N. Half bridge with diode clamp connected to each DC input source The LLC circuit has a phase difference of 360o/N, and the inductor and the transformer in the two-way LLC resonant circuit with phase difference of 180o are integrated into one inductor and transformer respectively. The integrated converter has N/2 resonant inductors and N/2 Transformer, as shown in Figure 4.

Embodiment 5

The difference from the second embodiment is that in this embodiment, there are N independent DC input sources with independent amplitudes, N is an integer multiple of 2, and each DC input source is connected to one half-bridge LLC resonant circuit, and each half-bridge LLC The transformer secondary of the resonant circuit is connected to a full-bridge rectifier circuit. The outputs of all the full-bridge rectifier circuits are output in parallel. The amplitude of the independent DC input source is 1/N of the voltage of the conventional rectifier bus. The half-bridge LLC circuit connected to each DC input source has a phase difference of 360o/N, and the inductor and the transformer in the two-way LLC resonant circuit with phase difference of 180o are respectively integrated into one inductor and transformer, and the integrated converter has N/2 resonant inductors and N/2 transformers are shown in Figure 5.

Embodiment 6

The difference from the second embodiment is that in this embodiment, there are N independent DC input sources with equal amplitudes, N is an integer multiple of 2, and each DC input source is connected to a half bridge LLC resonant circuit with diode clamping. The secondary of each half-bridge LLC resonant circuit with diode clamp is connected to a full-bridge rectifier circuit. The outputs of all the full-bridge rectifier circuits are connected in parallel. The amplitude of the independent DC input source is the traditional rectifier bus voltage. 1/N. The half-bridge LLC circuit with diode clamp connected to each DC input source has a phase difference of 360o/N, and the inductor and the transformer in the two LLC resonant circuits with phase difference of 180o are respectively integrated into one inductor and transformer. The integrated converter has N/2 resonant inductors and N/2 transformers, as shown in Figure 6.

Example 7

The difference from the second embodiment is that, in this embodiment, there are N independent DC input sources with equal amplitudes, N is an integer multiple of 2, and each DC input source is connected to one full-bridge LLC resonant circuit, and each full-bridge LLC The secondary side of the resonant circuit is connected to a full-wave rectifying circuit, and the outputs of all the full-wave rectifying circuits are output in parallel, and the amplitude of the independent DC input source is 1/N of the voltage of the conventional rectifier bus. The full-bridge LLC resonant circuit connected to each DC input source has a phase difference of 360o/N, and the phase is The inductor and transformer in the two-way LLC resonant circuit with phase difference of 180o are integrated into one inductor and transformer, respectively, and the integrated converter has N/2 resonant inductors and N/2 transformers, as shown in FIG.

Example eight

The difference from the second embodiment is that, in this embodiment, there are N independent DC input sources with equal amplitudes, N is an integer multiple of 2, and each DC input source is connected to one full-bridge LLC resonant circuit, and each full-bridge LLC The secondary of the resonant circuit is connected to a full-bridge rectifier circuit. The outputs of all the full-bridge rectifier circuits are output in parallel. The amplitude of the independent DC input source is 1/N of the voltage of the conventional rectifier bus. The full-bridge LLC resonant circuit connected to each DC input source has a phase difference of 360o/N, and the inductor and the transformer in the two-channel LLC resonant circuit with phase difference of 180o are respectively integrated into one inductor and transformer, and the integrated converter is integrated. There are N/2 resonant inductors and N/2 transformers, as shown in Figure 8.

The present disclosure also provides a non-transitory computer readable storage medium storing computer executable instructions arranged to perform the method of any of the above embodiments.

The present disclosure also provides a schematic structural diagram of an electronic device. Referring to FIG. 9, the electronic device includes:

At least one processor 90, which is exemplified by a processor 90 in FIG. 9; and a memory 91, may further include a communication interface 92 and a bus 93. The processor 90, the communication interface 92, and the memory 91 can complete communication with each other through the bus 93. Communication interface 92 can be used for information transfer. Processor 90 can invoke logic instructions in memory 91 to perform the methods of the above-described embodiments.

In addition, the logic instructions in the memory 91 described above may be implemented in the form of a software functional unit and sold or used as a stand-alone product, and may be stored in a computer readable storage medium.

The memory 91 is a computer readable storage medium and can be used to store a software program, a computer executable program, and a program instruction/module corresponding to the method in the embodiment of the present invention. The processor 90 executes the function application and the data processing by executing software programs, instructions, and modules stored in the memory 91, that is, the control method of the DC multi-input single-output resonant converter in the above method embodiment.

The memory 91 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to usage of the terminal device, and the like. Further, the memory 91 may include a high speed random access memory, and may also include a nonvolatile memory.

The technical solution of the embodiment of the present invention may be embodied in the form of a software product stored in a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network) The device or the like) performs all or part of the steps of the method described in the embodiments of the present invention. The foregoing storage medium may be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like. A medium that can store program code, or a transitory storage medium.

The embodiments disclosed in the present disclosure are as described above, but the contents thereof are only for the purpose of facilitating the understanding of the technical solutions of the present disclosure, and are not intended to limit the present disclosure. Any modifications and variations in the form and details of the embodiments may be made by those skilled in the art without departing from the scope of the present disclosure. It is subject to the scope defined by the appended claims.

Industrial applicability

The DC multi-input single-output resonant converter proposed by the present disclosure and its control method use fewer magnetic components, which can reduce the number of magnetic components, reduce the device volume, and improve the power density.

Claims

A DC multi-input single-output resonant converter comprising:

One or more pairs of parallel resonant transform coupling pairs and output filter circuits, each pair of said resonant transform coupling pairs being in series with said output filter circuit, each pair of said resonant transform coupling pairs comprising two sets of resonant converter circuits, said resonance The transform circuit includes a resonant circuit and a rectifying circuit; the resonant circuit and the rectifying circuit of each pair of the resonant transform coupling pairs are coupled by a transformer, and two of the pair of resonant conversion coupling pairs are inductively coupled.
The converter of claim 1 wherein the output filter circuit comprises a filter capacitor and an output load, the filter capacitor being coupled in parallel with the output load.
The converter of claim 1 wherein: said resonant circuit and said rectifying circuit of each pair of said resonantly coupled coupling pairs are coupled by a transformer to:

The transformer winding of the resonant circuit of each pair of the resonant conversion coupling pair and the transformer winding of the rectifier circuit are wound on the same magnetic core to form an integrated transformer.
The converter of claim 1 wherein the two resonant circuits of each pair of said resonantly coupled coupling pairs are inductively coupled by:

The inductive windings of the two resonant circuits of each pair of the resonant transform coupling pairs are wound on the same magnetic core to form an integrated inductor.
The converter of claim 1 wherein said resonant circuit comprises one of:

Half-bridge LLC resonant circuit, diode clamped half-bridge resonant circuit, full-bridge LLC resonant circuit.
The converter of claim 1 wherein: the rectifier circuit comprises a full bridge rectifier circuit or a full wave rectifier circuit.
A control method for a converter according to claim 1, comprising:

The phase of the operating voltage input to each resonant circuit is sequentially interleaved by 360o/N, which is a resonance The number of circuits;

The phases of the operating voltages input to the two resonant circuits of each pair of said resonantly-transformed coupled pairs are 180° out of phase.
The control method according to claim 7, wherein the two switching tubes of each of the resonance circuits are controlled to be alternately turned on.
The control method according to claim 7, wherein the input operating voltage amplitude of each of the resonant circuits is equal.
A non-transitory computer readable storage medium storing computer executable instructions arranged to perform the method of any of claims 7-9.