CN114006522B - Inductance-capacitance network unit and DC-DC converter - Google Patents

Inductance-capacitance network unit and DC-DC converter Download PDF

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Publication number
CN114006522B
CN114006522B CN202111596353.9A CN202111596353A CN114006522B CN 114006522 B CN114006522 B CN 114006522B CN 202111596353 A CN202111596353 A CN 202111596353A CN 114006522 B CN114006522 B CN 114006522B
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capacitor
unit
inductor
port
inductance
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CN114006522A (en
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付加友
高伟锋
王子健
智增辉
高圣钦
李晨光
朱建国
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Shenzhen Winline Technology Co Ltd
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Shenzhen Winline Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors

Abstract

The application provides an inductance-capacitance network unit and a DC-DC converter, which are applied to a power conversion system comprising an input filter unit, an inversion unit connected with the input filter unit, a transformation unit, an inductance-capacitance network unit, a first port, a second port, a third port, a fourth port, a rectification unit and an output filter unit, wherein the inversion unit, the transformation unit, the first port, the second port, the inversion unit, the third port, the fourth port, the rectification unit and the output filter unit are connected with the transformation unit, the inductance-capacitance network unit comprises a first capacitor, a first inductor, a second capacitor and a third capacitor, the first end of the first capacitor is connected with the first ends of the first inductor and the second capacitor, the first port is the second end of the first capacitor, the third port is the second end of the first inductor, the second port is the first end of the second inductor and the third capacitor, the second ends of the second capacitor and the third capacitor are grounded, the fourth port is a second end of the second inductor. And the problem of electromagnetic compatibility caused by high-frequency harmonics is reduced.

Description

Inductance-capacitance network unit and DC-DC converter
Technical Field
The application relates to the field of electronics, in particular to an inductance-capacitance network unit and a DC-DC converter.
Background
The DC-DC converter is a power electronic converter that converts a direct current electrical signal into a direct current electrical signal, and is widely applied to various fields such as electric vehicles, electric locomotives, household appliances, switching power supplies, and the like, and can be classified into an isolated type and a non-isolated type according to whether input and output are electrically isolated, and the isolated DC-DC converter is a direct-to-alternating-direct conversion circuit and has various conversion circuit topologies such as a forward type, a flyback type, a push-pull type, a half-bridge type, a full-bridge type, and the like. In different isolated DC-DC converter topologies, the nature of an inverter circuit is that a switching device is turned on or off, higher harmonics can be contained at the rising edge and the falling edge of the switching action of the switching device, and the higher harmonics can form a loop together with a shell along a grounded safety capacitor in the inverter circuit, a transformer, a rectifying circuit and a filter circuit. The Interference path of the higher harmonic is long, which causes large loss of devices, reduces the overall efficiency of the converter, and causes Interference to sensitive devices in the propagation path, such as hall sensors, induction coils, etc., and the longer propagation path may also cause the higher harmonic to be conducted outside the converter, resulting in the converter module exceeding the Electromagnetic Interference (EMI) test standard. Therefore, shortening the conduction path of the higher harmonic is one of the methods for eliminating the influence thereof.
The existing scheme for solving the problem that the higher harmonic waves generated by an inverter circuit flow to a rectifier circuit along the inverter circuit and a transformer is usually to reduce the length of a conducting path of the harmonic waves by increasing shielding in an isolation transformer and the like, and reduce the influence caused by parasitic capacitance between windings by increasing shielding among the windings, but the shielding added in the transformer can influence the heat dissipation of devices, and the scheme for adding the shielding in a multi-input and multi-output winding and some special-shaped transformers is relatively complex.
Disclosure of Invention
Based on the defects of the prior art, the application provides an inductance-capacitance network unit and a DC-DC converter, so as to block high-frequency harmonic waves generated by an inverter unit, avoid the high-frequency harmonic waves from flowing into a rectifier unit through a voltage transformation unit, reduce the propagation path of the high-frequency harmonic waves under the condition of not changing the transfer function and the characteristics of a power conversion system, reduce the problem of electromagnetic compatibility caused by the high-frequency harmonic waves, and improve the accuracy of the power conversion system.
In a first aspect, an embodiment of the present application provides an inductor-capacitor network unit, which is applied to a power conversion system, where the power conversion system includes an input filtering unit, an inverter unit, the inductor-capacitor network unit, a voltage transformation unit, a rectification unit, and an output filtering unit, and the inductor-capacitor network unit includes a first capacitor, a first inductor, a second capacitor, and a third capacitor; the input filter unit is connected with the inverter unit, a first port and a second port of the inductance-capacitance network unit are respectively connected with the inverter unit, a third port and a fourth port of the inductance-capacitance network unit are respectively connected with the voltage transformation unit, the voltage transformation unit is connected with the rectification unit, and the rectification unit is connected with the output filter unit; the first end of the first capacitor is connected with the first end of the first inductor and the first end of the second capacitor respectively, the first port is the second end of the first capacitor, the second end of the second capacitor is grounded, the third port is the second end of the first inductor, the second port is the first end of the second inductor and the first end of the third capacitor, the second end of the third capacitor is grounded, and the fourth port is the second end of the second inductor.
In a second aspect, embodiments of the present application provide a DC-DC converter including an inductor-capacitor network unit as described in the first aspect above.
It can be seen that the inductance-capacitance network unit provided by the application is applied to a power conversion system, the power conversion system comprises an input filtering unit, an inversion unit, an inductance-capacitance network unit, a transformation unit, a rectification unit and an output filtering unit, and the inductance-capacitance network unit comprises a first capacitor, a first inductor, a second capacitor and a third capacitor; the input filter unit is connected with the inversion unit, a first port and a second port of the inductance-capacitance network unit are respectively connected with the inversion unit, a third port and a fourth port of the inductance-capacitance network unit are respectively connected with the transformation unit, the transformation unit is connected with the rectification unit, and the rectification unit is connected with the output filter unit; the first end of the first capacitor is connected with the first end of the first inductor and the first end of the second capacitor, the first port is the second end of the first capacitor, the second end of the second capacitor is grounded, the third port is the second end of the first inductor, the second port is the first end of the second inductor and the first end of the third capacitor, the second end of the third capacitor is grounded, and the fourth port is the second end of the second inductor. The first inductor and the second inductor block high-frequency harmonics generated by the inverter unit, and the grounded second capacitor and the grounded third capacitor provide a discharge path for the high-frequency harmonics from the inverter unit, so that the energy of the high-frequency harmonics is effectively released without passing through the voltage transformation unit, the propagation path of the high-frequency harmonics is reduced under the condition of not changing the transfer function and the characteristics of the power conversion system, the loss of devices in the power conversion system is further reduced, the problem of electromagnetic compatibility caused by the high-frequency harmonics is reduced, and the efficiency and the stability of the power conversion system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a power conversion system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an inductor-capacitor network unit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another inductor-capacitor network unit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of high frequency harmonic conduction paths of a prior art DC-DC converter;
fig. 5 is a schematic diagram of a high-frequency harmonic conduction path of a DC-DC converter provided in the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The DC-DC converter is an isolated DC-DC converter, is a direct-alternating-direct conversion circuit and has various conversion circuit topologies such as a forward type, a flyback type, a push-pull type, a half-bridge type, a full-bridge type and the like.
The existing scheme for solving the problem that high-frequency harmonic waves generated by an inverter circuit flow to a rectifier circuit along the inverter circuit and a transformer is usually to reduce the length of a conducting path of the harmonic waves by increasing shielding in an isolation transformer and the like, and reduce the influence caused by parasitic capacitance between windings by increasing the shielding among the windings, but the shielding added in the transformer can influence the heat dissipation of devices, and the scheme for adding the shielding in a multi-input and multi-output winding and some special-shaped transformers is relatively complex.
In view of the above description, to solve the above problems, the present application provides an lc network unit and a DC-DC converter, which will be described in detail according to embodiments below.
Referring to fig. 1, fig. 1 is a schematic diagram of a power conversion system according to an embodiment of the present disclosure. As shown in fig. 1, the power conversion system 100 includes an input filtering unit 110, an inverting unit 120, an inductor-capacitor network unit 130, a transforming unit 140, a rectifying unit 150, and an output filtering unit 160, where the input filtering unit 110 is connected to the inverting unit 120, the inverting unit 120 is connected to the inductor-capacitor network unit 130, the inductor-capacitor network unit 130 is connected to the transforming unit 140, the transforming unit 140 is connected to the rectifying unit 150, and the rectifying unit 150 is connected to the output filtering unit 160.
The input filter unit 110 and the output filter unit 160 in the embodiment of the present application are grounded.
The lc network unit 130 is configured to block high-frequency harmonics of the inverter unit 120, so as to prevent the high-frequency harmonics from flowing into the rectifier unit 150 and the output filter unit 160 through the transformer unit 140.
Wherein, the high frequency harmonic refers to the harmonic with the harmonic frequency of more than or equal to 20 kHz.
It should be noted that, in practical applications, the isolated DC-DC converter includes the power conversion system 100.
In a possible embodiment, please refer to fig. 2, and fig. 2 is a schematic structural diagram of an lc network unit according to an embodiment of the present disclosure. As shown in fig. 2, the lc network unit 200 includes a first capacitor C1A first inductor L1A second inductor L2A second capacitor C2And a third capacitance C3(ii) a The first port a and the second port B of the lc network unit 200 are respectively connected to the inverter unit 220, the third port C and the fourth port D of the lc network unit 200 are respectively connected to the transformer unit 230, and the first capacitor C1Are respectively connected with the first inductor L1And said second capacitor C2The first port A is the first capacitor C1The second terminal of, the second capacitor C2Is grounded, the second terminal of saidThe third port C is the first inductor L1The second port B is the second inductor L2And said third capacitor C3The first terminal of (C), the third capacitor C3The second end of the second inductor L is grounded, and the fourth port D is the second inductor L2The second end of (a).
Wherein the second capacitor C2And said first inductance L1And the third capacitor C3And said second inductance L2The corresponding relationship of the second inductance value is:
jwL A far greater than
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，jwL B Far greater than
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，jwL A Far greater than
Figure DEST_PATH_IMAGE003
Means thatjwL A Is composed of
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Is n times of the total number of the first,jwL B far greater than
Figure DEST_PATH_IMAGE005
Means thatjwL B Is composed of
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N is greater than or equal to 10, where j is an imaginary unit, ω is an angular frequency, LAIs the first inductance value, CAIs the first capacitance value, LBIs the second inductance value, CBIs the second capacitance value.
It should be noted that, under the steady-state ac signal, the first inductor L1Impedance X ofLAComprises the following steps: xLA=jwL A Second inductance L2Impedance X ofLBComprises the following steps: xLB=jwL B A second capacitor C2Impedance X ofCAComprises the following steps: xCA=
Figure 338044DEST_PATH_IMAGE006
Said third capacitance C3Impedance X ofCBComprises the following steps: xCB=
Figure 860161DEST_PATH_IMAGE005
It can be seen that the first inductor L1And the second inductor L2A second capacitor C exhibiting high-resistance characteristic at high-frequency harmonics2And a third capacitance C3The inductor-capacitor network unit 200 can pass through the first inductor L to exhibit low resistance characteristic under high frequency harmonic1And the second inductor L2Blocking the high frequency harmonics generated from the inverter unit 220 to prevent the high frequency harmonics from flowing into the rectifier unit 240 through the transformer unit 230, and a grounded second capacitor C2And a third capacitor C connected to ground3Can form a loop with the input filter unit 210 connected to ground because of the second capacitor C2And a third capacitance C3Exhibits a low resistance characteristic at high frequency harmonics and is therefore passed through the second capacitor C connected to ground2And a third capacitor C connected to ground3A leakage path is provided for the high frequency harmonics from the inverter unit 220, so that the energy of the high frequency harmonics is effectively released without passing through the transformer unit 230, and under the condition of not changing the transfer function and characteristics of the power conversion system, the propagation path of the high frequency harmonics is reduced, thereby reducing the loss of devices in the power conversion system, reducing the problem of electromagnetic Compatibility (EMC) caused by the high frequency harmonics, and improving the efficiency and stability of the power conversion system.
EMC refers to the ability of the power conversion system and DC-DC converter of the present invention to perform satisfactorily in its electromagnetic environment without generating intolerable electromagnetic interference to any device in its environment.
In a possible embodiment, please refer to fig. 3, and fig. 3 is a schematic structural diagram of another inductor-capacitor network unit according to an embodiment of the present application. As shown in fig. 3, the lc network unit 300 includes a first capacitor C1A first inductor L1A second inductor L2A second capacitor C2A third capacitor C3A first resistor R1And a second resistor R2(ii) a The first port a and the second port B of the lc network unit 300 are respectively connected to the inverter unit 320, the third port C and the fourth port D of the lc network unit 300 are respectively connected to the transformer unit 330, and the first capacitor C1Are respectively connected with the first inductor L1And said second capacitor C2The first port A is the first capacitor C1The second terminal of, the second capacitor C2Is connected to the first resistor R1The first terminal of (1), the first resistor R1The second end of the first inductor L is grounded, and the third port C is the first inductor L1The second port B is the second inductor L2And said third capacitor C3The first terminal of (C), the third capacitor C3Is connected to the second resistor R2The first terminal of (2), the second resistor R2The second end of the second inductor L is grounded, and the fourth port D is the second inductor L2The second end of (a).
It is obvious that the lc network unit 300 is grounded compared to the lc network unit 2002Is connected with a first resistor R in series1And a third capacitor C connected to ground3Is connected with a second resistor R in series2。
Wherein, the first inductor L in the lc network unit 3001A second inductor L2A second capacitor C connected to ground2And a third capacitor C connected to ground3And a first inductor L in the LC network unit 2001A second inductor L2A second capacitor C connected to ground2And a third capacitor C connected to ground3The same applies to the first inductor L in fig. 21A second inductor L2A second capacitor C connected to ground2And a third capacitor C connected to ground3The description of (1) is not repeated herein.
Furthermore, the second capacitor C2The first resistor R1And the first inductance L1Corresponding relation and the third capacitance C3The second resistor R2And the second inductance L2The corresponding relation is as follows: at high frequency harmonics, the first resistor R1And said second capacitance C2Is smaller than the first inductance L1The impedance of the second resistor R2And said third capacitance C3Is less than the second inductance L2The impedance of (c).
Specifically, the first capacitance value, the first inductance value, and the first resistor R1And the second capacitance value, the second inductance value, and the second resistance R2The corresponding relationship of the second resistance value is as follows:
jwL A far greater than
Figure DEST_PATH_IMAGE007
，jwL B Far greater than
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，jwL A Far greater than
Figure DEST_PATH_IMAGE009
Means thatjwL A Is composed of
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Is n times of the total number of the first,jwL B far greater than
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Means thatjwL B Is composed of
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N times of (a), wherein RAIs the first resistance value, RBIs the second resistance value.
When the second capacitor C is used, it is noted that2During discharging, the first resistor R1Limiting the second capacitance C2And the first resistor R1The current of the first loop prevents the device in the first loop from being damaged due to overlarge current when the second capacitor C3During discharging, the second resistor R2Limiting the third capacitance C3And said second resistance R2The current of the second loop prevents the devices in the second loop from being damaged due to overlarge current.
In one possible example, the input filtering unit 310 includes a fourth capacitor and a fifth capacitor, the inverting unit includes a first switch and a second switch, a first end of the fourth capacitor and a first end of the fifth capacitor are grounded, a second end of the fourth capacitor is connected to a drain of the first switch, a source of the first switch is connected to a drain of the second switch and the first port a, respectively, and a second end of the fifth capacitor is connected to a source of the second switch and the second port B, respectively.
The input filter unit 310 may also include other structures, and is not particularly limited.
In one possible example, the transforming unit 330 includes a primary winding and a secondary winding, a first end of the primary winding is connected to the third port C, a second end of the primary winding is connected to the fourth port D, and a first end and a second end of the secondary winding are connected to the rectifying unit 340.
The transforming unit 330 may further include other structures, and is not particularly limited.
The following describes the lc network unit 200 and the lc network unit 300 with reference to application scenarios.
The lc network unit 200 and the lc network unit 300 include, but are not limited to, those suitable for: the transformer transmitting end of the unidirectional DC-DC converter and the transformer have various converter topological structures with series inductance, or the transformer two ends of the bidirectional DC-DC converter and the transformer have various converter topological structures with series inductance.
For example, referring to fig. 4 and fig. 5, fig. 4 is a schematic diagram of a high-frequency harmonic conduction path of a DC-DC converter in the prior art, as shown in fig. 4, the DC-DC converter 400 includes an input filter circuit 410, an inverter circuit 420, an inductor-capacitor network circuit 430, a transformer 440, a rectifying circuit 450, and an output filter circuit 460, wherein the inductor-capacitor network circuit 430 includes a first capacitor C1And a target inductance L, the input filter circuit 410 including a second capacitance C2And a third capacitance C3The inverter circuit 420 includes a first switch K1And a second switch K2The transformer 440 includes a primary winding and a secondary winding, and the second capacitor C2And said third capacitor C3Is grounded, and the second capacitor C2Is connected to the first switch K1The drain electrode of the first switch K1Are respectively connected with the second switches K2And the first port a of the inverter circuit 420, the third capacitor C3Are respectively connected with the second switch K2And a second port B of the inverter circuit 420, the first port a being the first capacitor C1The first terminal of (C), the first capacitor C1The second end of the target inductor L is a third port C of the inverter circuit 420, the second port B of the inverter circuit 420 is connected with a fourth port D of the inverter circuit 420 through a wire, the first end of the primary winding is connected with the third port C, the second end of the primary winding is connected with the fourth port D, the first end and the second end of the secondary winding are respectively connected with the rectifier circuit 450, the rectifier circuit 450 is connected with the output filter circuit 460, and the output filter circuit 460 is grounded.
Referring to fig. 5, fig. 5 is provided for the present applicationReferring to fig. 5, a DC-DC converter 500 includes an input filter circuit 510, an inverter circuit 520, an inductor-capacitor network circuit 530, a transformer 540, a rectifier circuit 550, and an output filter circuit 560, wherein the inductor-capacitor network circuit 530 includes a first capacitor C1A first inductor L1A second inductor L2A second capacitor C2A third capacitor C3A first resistor R1And a second resistor R2The input filter circuit 510 includes a fourth capacitor C4And a fifth capacitance C5The inverter circuit 520 includes a first switch K1And a second switch K2The transformer 540 includes a primary winding and a secondary winding, and the fourth capacitor C4And said fifth capacitor C5Is grounded, and the fourth capacitor C4Is connected to the first switch K1The drain electrode of the first switch K1Are respectively connected with the second switches K2And the first port a of the inverter circuit 520, the fifth capacitor C5Are respectively connected with the second switch K2And the second port B of the inverter circuit 520, the first capacitor C1Are respectively connected with the first inductor L1And said second capacitor C2The first port A is the first capacitor C1The third port C of the inverter circuit 520 is the first inductor L1The second terminal of, the second capacitor C2Is connected to the first resistor R1The first terminal of (1), the first resistor R1Is grounded, and the second inductor L is arranged at the second port B of the inverter circuit 5202And said third capacitor C3The fourth port D of the inverter circuit 520 is the second inductor L2The second terminal of (C), the third capacitor C3Is connected to the second resistor R2The first terminal of (2), the second resistor R2Is connected to ground, and the first end of the primary winding is connected to the third port C, soThe second end of the primary winding is connected to the fourth port D, the first end and the second end of the secondary winding are respectively connected to the rectifying circuit 550, the rectifying circuit 550 is connected to the output filter circuit 560, and the output filter circuit 560 is grounded.
It is understood that the DC-DC converter 500 differs from the DC-DC converter 400 in that the inductor-capacitor network circuit 430 is replaced by an inductor-capacitor network circuit 530, and the circuit structure of the inductor-capacitor network circuit 530 is the structure of the inductor-capacitor network unit 300 shown in fig. 3. In a specific implementation, the DC-DC converter 500 can be improved on the basis of the DC-DC converter 400, and the target inductance L of the series connection of the DC-DC converter 400 and the transformer 440 is divided into two inductances, i.e. the first inductance L in the DC-DC converter 5001And a second inductance L2Wherein, the target inductance L and the first inductance L1And a second inductance L2The corresponding relation is as follows:L C =L A + L B ，L C a third inductance value for the target inductance L,L A is a first inductance L1The first inductance value of (a) is,L B is a second inductance L2The second inductance value of (1).
At the first switch K1Rising and falling edges of the switching action, said first switch K1The drain-source voltage of (1) may contain a higher harmonic wave, such as a conduction path of the higher harmonic wave shown by a dotted arrow in fig. 4, in the DC-DC converter 400, the higher harmonic wave may flow to the output filter circuit 460 through the transformer 440 and the rectifier circuit 450, and after the improvement, such as the conduction path of the higher harmonic wave shown by a dotted arrow in fig. 5, in the DC-DC converter 500, the higher harmonic wave may be induced by the first inductor L1And a second inductance L2Is blocked from flowing into the transformer 540, and passes through the grounded second inductor L2A leakage path is provided for the high frequency harmonic wave, so that the energy of the high frequency harmonic wave is effectively released without passing through the transformer 540, and the second inductor L2Second resistor R connected in series2Prevent the device in the leakage path from being damaged due to excessive current andthe transfer function and the characteristic of the DC-DC converter under the action of the inductance-capacitance network circuit 530 and the inductance-capacitance network circuit 430 are the same, the propagation path of the higher harmonic is reduced, the loss of devices in the DC-DC converter is reduced, the problem of electromagnetic compatibility caused by the high frequency harmonic is reduced, and meanwhile, the efficiency and the stability of the DC-DC converter are improved.
The configuration of the lc-network circuit 530 in the DC-DC converter 400 may be replaced with the configuration of the lc-network unit 200 shown in fig. 2. There are also the target inductance L and two inductances after replacement (first inductance L)1And a second inductance L2) The corresponding relation is as follows:L C =L A + L B ，L C a third inductance value for the target inductance L,L A is a first inductance L1The first inductance value of (a) is,L B is a second inductance L2The second inductance value of (1).
An input filter circuit in the DC-DC converter corresponds to an input filter unit in the power conversion system, an inverter circuit in the DC-DC converter corresponds to an inverter unit in the power conversion system, an inductor-capacitor network circuit in the DC-DC converter corresponds to an inductor-capacitor network unit in the power conversion system, a transformer in the DC-DC converter corresponds to a transformer unit in the power conversion system, a rectifier circuit in the DC-DC converter corresponds to a rectifier unit in the power conversion system, and an output filter circuit in the DC-DC converter corresponds to an output filter unit 160 in the power conversion system.
As can be seen from the above examples, the essence of the present application is that, for a DC-DC converter in the prior art, a target inductor originally connected in series with a transformer in an inductor-capacitor network circuit is split into two inductors (the sum of the inductance values of the two split inductors is equal to the inductance value of the target inductor), the two inductors are connected to two ends of the transformer, and then a grounded capacitor loop or a grounded capacitor-resistor loop is matched, so that the transfer function and characteristics of the original converter are not changed, but the propagation path of higher harmonics is reduced, the loss of devices in the original converter is reduced, the problem of electromagnetic compatibility caused by high-frequency harmonics is reduced, and the efficiency and stability of the original converter are improved.
The embodiment of the application provides a DC-DC converter, and the DC-DC converter comprises an inductance-capacitance network unit as described in the embodiment.
The above embodiments are merely representative of the centralized embodiments of the present invention, and the description thereof is specific and detailed, but it should not be understood as the limitation of the scope of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the spirit of the present invention, and these changes and modifications all fall into the protection scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (5)

1. An inductance-capacitance network unit is characterized by being applied to a power conversion system, wherein the power conversion system comprises an input filter unit, an inversion unit, an inductance-capacitance network unit, a transformation unit, a rectification unit and an output filter unit, the inductance-capacitance network unit comprises a first capacitor, a first inductor, a second capacitor and a third capacitor, the input filter unit comprises a fourth capacitor and a fifth capacitor, the inversion unit comprises a first switch and a second switch, and the transformation unit comprises a primary winding and a secondary winding;
a first end of the fourth capacitor and a first end of the fifth capacitor are grounded, a second end of the fourth capacitor is connected with a drain electrode of the first switch, a source electrode of the first switch is respectively connected with a drain electrode of the second switch and a first port of the inductance-capacitance network unit, a second end of the fifth capacitor is respectively connected with a source electrode of the second switch and a second port of the inductance-capacitance network unit, a first end of the primary winding is connected with a third port of the inductance-capacitance network unit, a second end of the primary winding is connected with a fourth port of the inductance-capacitance network unit, a first end and a second end of the secondary winding are connected with the rectifying unit, and the rectifying unit is connected with the output filter unit;
a first end of the first capacitor is connected to a first end of the first inductor and a first end of the second capacitor, respectively, the first port is a second end of the first capacitor, a second end of the second capacitor is grounded, the third port is a second end of the first inductor, the second port is a first end of the second inductor and a first end of the third capacitor, a second end of the third capacitor is grounded, and the fourth port is a second end of the second inductor;
the correspondence between the first capacitance value of the second capacitor and the first inductance value of the first inductor, and the correspondence between the second capacitance value of the third capacitor and the second inductance value of the second inductor are as follows:
jwL A far greater than
Figure 6526DEST_PATH_IMAGE001
，jwL B Far greater than
Figure 674267DEST_PATH_IMAGE002
，jwL A Far greater than
Figure 435157DEST_PATH_IMAGE003
Means thatjwL A Is composed of
Figure 756416DEST_PATH_IMAGE004
Is n times of the total number of the first,jwL B far greater than
Figure 979587DEST_PATH_IMAGE005
Means thatjwL B Is composed of
Figure 44495DEST_PATH_IMAGE006
N is greater than or equal to 10, where j is an imaginary unit, ω is an angular frequency, LAIs the first inductance value, CAIs the first capacitance value, LBIs the firstTwo inductance values, CBIs the second capacitance value.
2. The lc network element of claim 1, further comprising a first resistor and a second resistor;
the first end of the first resistor is connected with the second end of the second capacitor, the second end of the first resistor is grounded, the first end of the second resistor is connected with the second end of the third capacitor, and the second end of the second resistor is grounded.
3. The lc network unit of claim 2, wherein the correspondence between the second capacitor, the first resistor and the first inductor and the correspondence between the third capacitor, the second resistor and the second inductor are:
at high frequency harmonics, the sum of the impedance of the first resistor and the impedance of the second capacitor is less than the impedance of the first inductor, and the sum of the impedance of the second resistor and the impedance of the third capacitor is less than the impedance of the second inductor.
4. The lc network unit of claim 3, wherein the correspondence between the first capacitance value, the first inductance value and the first resistance value of the first resistor, and the correspondence between the second capacitance value, the second inductance value and the second resistance value of the second resistor are:
jwL A far greater than
Figure 895777DEST_PATH_IMAGE007
，jwL B Far greater than
Figure 794463DEST_PATH_IMAGE008
，jwL A Far greater than
Figure 131028DEST_PATH_IMAGE009
Means thatjwL A Is composed of
Figure 609414DEST_PATH_IMAGE010
Is n times of the total number of the first,jwL B far greater than
Figure 846360DEST_PATH_IMAGE011
Means thatjwL B Is composed of
Figure 650368DEST_PATH_IMAGE012
N times of (a), wherein RAIs the first resistance value, RBIs the second resistance value.
5. A DC-DC converter, characterized in that it comprises an LC network element according to any of claims 1-4.
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CN106059306A (en) * 2016-05-30 2016-10-26 西安交通大学 Multi-unit diode capacitor network high-gain full-bridge isolated direct current converter

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US7746675B2 (en) * 2007-03-26 2010-06-29 Virginia Tech Intellectual Properties, Inc. Asymmetrical interleaving strategy for multi-channel power converters
CN103283135A (en) * 2010-12-27 2013-09-04 株式会社日立制作所 Electric power converter
CN104734520A (en) * 2015-03-23 2015-06-24 深圳市皓文电子有限公司 DC/DC converter
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