CN113328633A - Interleaved four-channel low-current ripple LLC resonant converter - Google Patents

Interleaved four-channel low-current ripple LLC resonant converter Download PDF

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Publication number
CN113328633A
CN113328633A CN202110539485.1A CN202110539485A CN113328633A CN 113328633 A CN113328633 A CN 113328633A CN 202110539485 A CN202110539485 A CN 202110539485A CN 113328633 A CN113328633 A CN 113328633A
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current
resonant
channel
winding
positive electrode
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Inventor
薛飞
王小立
李旭涛
李宏强
马鑫
徐恒山
张爽
田蓓
周雷
张迪
王超
杨慧彪
顾雨嘉
张汉花
吴玫蓉
梁剑
任勇
李峰
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China Three Gorges University CTGU
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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China Three Gorges University CTGU
Electric Power Research Institute of State Grid Ningxia Electric Power 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
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides an interleaved four-channel low-current ripple LLC resonant converter, and belongs to the technical field of power electronics. The method comprises the following steps: four resonant channels and a load part, wherein the first resonant channel is composed of a primary side semiconductor switching device Q1Resonant capacitor Cr1Resonant inductor Lr1Transformer T1Diode D1And a diode D2Composition is carried out; the second resonant channel is composed of a primary side semiconductor switching device Q2Resonant capacitor Cr2Resonant inductor Lr2Transformer T2Rectifier diode D3And a rectifier diode D4Composition is carried out; the third resonant channel is composed of a primary side semiconductor switching device Q3Resonant capacitor Cr3Resonant inductor Lr3Transformer T3Rectifier diode D5And a rectifier diode D6Composition is carried out; the fourth resonant channel is composed of a primary side semiconductor switching device Q4Resonant capacitor Cr4Resonant inductor Lr4Transformer T4Rectifier diode D7And a rectifier diode D8Composition is carried out; the load part comprises a capacitive filter CoAnd an equivalent load resistance Ro。

Description

Interleaved four-channel low-current ripple LLC resonant converter
Technical Field
The invention relates to the technical field of power electronics, in particular to an interleaved four-channel low-current ripple LLC resonant converter.
Background
When the energy storage power station is charged and discharged, in order to electrically isolate the energy storage measurement and the power grid measurement, charging equipment with an electrical isolation function is required to be adopted, and the charging and discharging power of the energy storage power station is high, so that the problem that the current stress is high when the traditional converter is charged and discharged is solved.
The traditional lead-acid battery as an energy storage device has great engineering application value. When a lead-acid battery is charged, the traditional isolated direct current converter can output large current ripples which are main factors endangering the service life of the lead-acid battery; in addition, the traditional isolation type direct current converter can output a filter capacitor in a large volume in the working process.
Disclosure of Invention
In view of this, the invention provides the interleaved four-channel low-current ripple LLC resonant converter, which charges the lead-acid battery through the four interleaved resonant channels, can effectively weaken the output measured current ripple, improve the service life of the lead-acid energy storage battery, and at the same time, can also reduce the volume and cost of the output filter capacitor, and is beneficial to reducing the volume of the passive device and improving the power density of the passive device.
The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows:
an interleaved four-channel low-current ripple LLC resonant converter comprises four resonant channels and a load part,
the first resonant channel is composed of a primary side semiconductor switching device Q1Resonant capacitor Cr1Resonant inductor Lr1Transformer T1Diode D1And a diode D2Composition is carried out; the second resonant channel is composed of a primary side semiconductor switching device Q2Resonant capacitor Cr2Resonant inductor Lr2Transformer T2Rectifier diode D3And a rectifier diode D4Composition is carried out; the third resonant channel is composed of a primary side semiconductor switching device Q3Resonant capacitor Cr3Resonant inductor Lr3Transformer T3Rectifier diode D5And a rectifier diode D6Composition is carried out; the fourth resonant channel is composed of a primary side semiconductor switching device Q4Resonant capacitor Cr4Resonant inductor Lr4Transformer T4Rectifier diode D7And a rectifier diode D8Composition is carried out;
the load part comprises a capacitive filter CoAnd an equivalent load resistance Ro；
Said Q1And said Q2In series, said Q1Is connected to a voltage source UinThe positive electrode of (1), the Q2Is connected to the UinThe negative electrode of (1), the T1One end of the primary winding is connected with the C in seriesr1Is then connected to the UinThe positive electrode of (1), the positive electrode of (T)1The other end of the primary winding is connected in series with the Lr1Post-connected to said Q1And said Q2A node a between, the T2One end of the primary winding is connected in series with the Lr2Is then connected to the node a, the T2The other end of the primary winding is connected in series with the Cr2Is then connected to the UinThe negative electrode of (1);
said Q3And said Q4In series, said Q3Is connected to the UinThe positive electrode of (1), the Q4Is connected to the UinThe negative electrode of (1), the T3One end of the primary winding is connected with the C in seriesr3Is then connected to the UinThe positive electrode of (1), the positive electrode of (T)3The other end of the primary winding is connected in series with the Lr3Post-connected to said Q3And said Q4Node b in between, the T4One end of the primary winding is connected in series with the Lr4Is then connected to the node b, the T4The other end of the primary winding is connected in series with the Cr4Is then connected toUinThe negative electrode of (1);
the T is1Comprising 2 secondary windings, T1One secondary winding of (2) is connected with the D1The anode of (a), the T1Is connected to said D2The anode of (D)1And the cathode and the anode2Are all connected to an output voltage UoThe positive electrode of (1);
the T is2Comprising 2 secondary windings, T2One secondary winding of (2) is connected with the D3The anode of (a), the T2Is connected to said D4The anode of (D)3And the cathode and the anode4Are all connected to an output voltage UoThe positive electrode of (1);
the T is3Comprising 2 secondary windings, T3One secondary winding of (2) is connected with the D5The anode of (a), the T3Is connected to said D6The anode of (D)5And the cathode and the anode6Are all connected to an output voltage UoThe positive electrode of (a) a positive electrode,
the T is4Comprising 2 secondary windings, T4One secondary winding of (2) is connected with the D7The anode of (a), the T4Is connected to said D8The anode of (D)7And the cathode and the anode8Are all connected to an output voltage UoThe positive electrode of (a) a positive electrode,
the T is1Of said center-tapped winding, said T2Of said center-tapped winding, said T3Of said center-tapped winding, said T4Are all connected to the UoThe negative electrode of (1), the positive electrode of (C)oAre respectively connected to the UoOf two poles of (A), said RoAnd said CoThe two are connected in parallel,
excitation inductance Lm1Is connected to the T 12 primary windings of the transformer, an excitation inductance Lm2Is connected to the T 22 primary windings of the transformer, an excitation inductance Lm3Is connected toThe T is32 primary windings of the transformer, an excitation inductance Lm4Is connected to the T 42 primary windings.
Preferably, said Q1Trigger signal p1A pulse width modulation PWM signal with the duty ratio of 50 percent;
said Q2Trigger signal p2Is a PWM signal with a duty cycle of 50%, p2Frequency of (d) and said p1Is equal in frequency, said p2Is greater than the initial phase of p1180 degrees after the initial phase lag;
said Q3Trigger signal p3Is a PWM signal with a duty cycle of 50%, p3Lags behind the Q3The initial phase of the original trigger signal is 90 degrees;
said Q4Trigger signal p4Is a PWM signal with a duty cycle of 50%, p4Lags behind the Q4The initial phase of the original trigger signal is 180 degrees, so that a 180-degree staggered working mode is formed between the first resonant channel and the second resonant channel, a 180-degree staggered working mode is formed between the third resonant channel and the fourth resonant channel, a 90-degree staggered working mode is formed between the first resonant channel and the third resonant channel, and a 270-degree staggered working mode is formed between the first resonant channel and the fourth resonant channel.
Preferably, t is characterized bysIs the switching period of the semiconductor switching device on the primary side, frIs a resonant frequency, CrIn order to be a resonant capacitor, the resonant capacitor,
Figure BDA0003068634760000041
Figure BDA0003068634760000042
Cr1＝Cr2＝Cr3＝Cr4＝Cr
Lr1＝Lr2＝Lr3＝Lr4＝Lr
preferably, t is more than or equal to 0 and less than or equal to 0.25tsWhen is, the p is1And said p3At a high level, said p2And said p4At a low level, the Q2And said Q4Is turned on, the Q1And said Q3Off, said D1D the above4D the above6And said D7Is turned on, D2D the above3D the above5And said D8Turning off;
0.25ts≤t≤0.5tswhen is, the p is1And said p4At a high level, said p2And said p3At a low level, the Q2And said Q3On, Q1And Q4Off, said D1D the above4D the above5And said D8Is turned on, D2D the above3D the above6And said D7Turning off;
0.5ts≤t≤0.75tswhen is, the p is2And said p4At a high level, said p1And said p3At a low level, the Q1And said Q3Is turned on, the Q2And said Q4Off, said D2D the above3D the above5And said D8Is turned on, D1D the above4D the above6And said D7Turning off;
0.75ts≤t≤tswhen is, the p is2And said p4At a high level, said p2And said p3At a low level, the Q1And said Q4Is turned on, the Q2And said Q3Off, said D2D the above3D the above6And said D7Is turned on, D1D the above4D the above5And said D8And (6) turning off.
Preferably, said T1Has a winding transformation ratio of nT1Said T is2Has a winding transformation ratio of nT2Said T is3Has a winding transformation ratio of nT3Said T is4Has a winding transformation ratio of nT4；
Current iQ1To flow through the Q1Current of, current iQ2To flow through the Q2Current of, current iQ3To flow through the Q3Current of, current iQ4To flow through the Q4The current of (a) is measured,
current im1Is said T1Excitation current of, current im2Is said T2Excitation current of, current im3Is said T3Excitation current of, current im4Is said T4The current of the magnetic field sensor,
current ir1Is the resonant current of the first resonant channel, current ir2Is the resonant current of the second resonant channel, current ir3Is the resonant current of the third resonant channel, current ir4Is the resonant current of the fourth resonant channel,
current iD1Is said D1Current of, current iD2Is said D2Current of, current iD3Is said D3Current of, current iD4Is said D4Current of, current iD5Is said D5Current of, current iD6Is said D6Current of, current iD7Is said D7Current of, current iD8Is said D8The current of (a) is measured,
current ioFor the current after the four resonant channels are staggered, the current iCoIs the CoThe current of (2).
According to the technical scheme, the interleaved four-channel low-current ripple LLC resonant converter provided by the embodiment of the invention can charge the lead-acid battery through the four interleaved resonant channels, effectively weaken output measured current ripples, prolong the service life of the lead-acid energy storage battery, reduce the volume and cost of an output filter capacitor, and is beneficial to reducing the volume of a passive device and improving the power density of the passive device.
Drawings
Fig. 1 is a circuit structure diagram of an interleaved four-channel low-current ripple LLC resonant converter according to an embodiment of the present invention.
Fig. 2 is a diagram of trigger signals of a primary side semiconductor device of an interleaved four-channel low-current-ripple LLC resonant converter according to an embodiment of the present invention.
Fig. 3 is a waveform diagram of four resonant currents of the interleaved four-channel low-current ripple LLC resonant converter according to the embodiment of the present invention.
Fig. 4 is a current waveform diagram of a secondary side semiconductor device of an interleaved four-channel low-current-ripple LLC resonant converter according to an embodiment of the present invention.
Fig. 5 is a diagram of current ripples on an output filter capacitor of a conventional full-bridge LLC resonant converter.
Fig. 6 is a current ripple diagram on an output filter capacitor of the interleaved four-channel low-current ripple LLC resonant converter in an embodiment of the present invention.
In the figure: primary side semiconductor switching device Q1Primary side semiconductor switch device Q2Primary side semiconductor switch device Q3Primary side semiconductor switch device Q4Resonant capacitor Cr1Resonant capacitor Cr2Resonant capacitor Cr3Resonant capacitor Cr4Resonant inductor Lr1Resonant inductor Lr2Resonant inductor Lr3Resonant inductor Lr4Transformer T1Transformer T2Transformer T3Transformer T4Diode D1Diode D2Diode D3Diode D4Diode D5Diode D6Diode D7Diode D8Capacitor filter CoEquivalent load resistance RoNode a, node b, voltage source UinOutput voltage UoAnd an excitation inductor Lm1And an excitation inductor Lm2And an excitation inductor Lm3And an excitation inductor Lm4Control signal p1Control signalNumber p2Control signal p3Control signal p4Current iD1Current iD2Current iD3Current iD4Current iD5Current iD6Current iD7Current iD8Current iQ1Current iQ2Current iQ3Current iQ4Current im1Current im2Current im3Current im4Current ir1Current ir2Current ir3Current ir4。
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements and electrical quantities, or elements having the same or similar functions, throughout. The following example is only one example of the application of the present invention and is not to be construed as limiting the present invention.
As shown in fig. 1, an interleaved 4-channel low-current ripple LLC resonant converter provided in the embodiment of the present invention is configured to convert an input dc voltage into another dc voltage to supply a dc load, and includes four resonant channels and a load part, where:
the first resonant channel is composed of a primary side semiconductor switching device Q1Resonant capacitor Cr1Resonant inductor Lr1Transformer T1Diode D1And a diode D2Composition is carried out; the second resonant channel is composed of a primary side semiconductor switching device Q2Resonant capacitor Cr2Resonant inductor Lr2Transformer T2Rectifier diode D3And a rectifier diode D4Composition is carried out; the third resonant channel is composed of a primary side semiconductor switching device Q3Resonant capacitor Cr3Resonant inductor Lr3Transformer T3Rectifier diode D5And a rectifier diode D6Composition is carried out; the fourth resonant channel is composed of a primary side semiconductor switching device Q4Resonant capacitor Cr4Resonant inductor Lr4Transformer T4Rectifier diode D7And rectificationDiode D8Composition is carried out; the load part is composed of a capacitor filter CoAnd an equivalent load resistance RoAnd (4) forming.
As shown in fig. 1, the specific connection method is as follows:
Q1and Q2In series, Q1Is connected to a voltage source UinPositive electrode of (2), Q2Is connected to UinNegative electrode of (1), T1One end of the primary winding is connected in series with Cr1Is connected to UinPositive electrode of (2), T1The other end of the primary winding is connected in series with Lr1Post-connected to Q1And Q2Node a, T between2One end of the primary winding is connected in series with Lr2Back-connected to nodes a, T2The other end of the primary winding is connected in series with Cr2Is connected to UinThe negative electrode of (1);
Q3and Q4In series, Q3Is connected to UinPositive electrode of (2), Q4Is connected to UinNegative electrode of (1), T3One end of the primary winding is connected in series with Cr3Is connected to UinPositive electrode of (2), T3The other end of the primary winding is connected in series with Lr3Post-connected to Q3And Q4Node b, T between4One end of the primary winding is connected in series with Lr4Back-connected to node b, T4The other end of the primary winding is connected in series with Cr4Is connected to UinThe negative electrode of (1);
T1comprising 2 secondary windings, T1One of the secondary windings of (2) is connected to (D)1Anode of (2), T1Is connected to the other secondary winding D2Anode of (D)1And D2Are all connected to an output voltage UoThe positive electrode of (1);
T2comprising 2 secondary windings, T2One of the secondary windings of (2) is connected to (D)3Anode of (2), T2Is connected to the other secondary winding D4Anode of (D)3And D4Are all connected to an output voltage UoThe positive electrode of (1);
T3comprising 2 secondary windings, T3Of whichOne secondary winding is connected with D5Anode of (2), T3Is connected to the other secondary winding D6Anode of (D)5And D6Are all connected to an output voltage UoThe positive electrode of (a) a positive electrode,
T4comprising 2 secondary windings, T4One of the secondary windings of (2) is connected to (D)7Anode of (2), T4Is connected to the other secondary winding D8Anode of (D)7And D8Are all connected to an output voltage UoThe positive electrode of (a) a positive electrode,
T1of a center-tapped winding, T2Of a center-tapped winding, T3Of a center-tapped winding, T4The center tap windings are all connected to the UoNegative electrode of (1), CoAre respectively connected to U at both endsoOf two poles RoAnd CoThe two are connected in parallel,
excitation inductance Lm1Is connected at T 12 primary windings of the transformer, an excitation inductance Lm2Is connected at T 22 primary windings of the transformer, an excitation inductance Lm3Is connected at T 32 primary windings of the transformer, an excitation inductance Lm4Is connected at T 42 primary windings.
T1Has a winding transformation ratio of nT1，T2Has a winding transformation ratio of nT2，T3Has a winding transformation ratio of nT3，T4Has a winding transformation ratio of nT4(ii) a Current iQ1To flow through Q1Current of, current iQ2To flow through Q2Current of, current iQ3To flow through Q3Current of, current iQ4To flow through Q4Current of, current im1Is T1Excitation current of, current im2Is T2Excitation current of, current im3Is T3Excitation current of, current im4Is T4Excitation current of, current ir1Is the resonant current of the first resonant channel, current ir2Is the resonant current of the second resonant channel, current ir3Is the resonant current of the third resonant channel, current ir4Is the resonant current of the fourth resonant channel, current iD1Is D1Current of, current iD2Is D2Current of, current iD3Is D3Current of, current iD4Is D4Current of, current iD5Is D5Current of, current iD6Is D6Current of, current iD7Is D7Current of, current iD8Is D8Current of, current ioFor the current after interleaving of four resonant channels, current iCoIs CoThe current of (2).
As shown in FIG. 2, tsIn equations (1) to (4), f is the switching period of the primary side semiconductor switching devicerIs a resonant frequency, CrThe resonance parameters of the four resonance channels are the same for the resonance capacitance,
Figure BDA0003068634760000081
Figure BDA0003068634760000082
Cr1＝Cr2＝Cr3＝Cr4＝Cr (3)
Lr1＝Lr2＝Lr3＝Lr4＝Lr (4)
0≤t≤0.25tswhen, as shown in FIG. 2, p1And p3Is high level, p2And p4Is low level, Q2And Q4On, Q1And Q3Off, as shown in FIG. 3, the secondary side semiconductor device D1、D4、D6And D7Conducting, secondary side semiconductor device D2、D3、D5And D8Turning off;
0.25ts≤t≤0.5tswhen, as shown in FIG. 2, p1And p4Is high level, p2And p3Is low level, Q2And Q3On, Q1And Q4Off, as shown in FIG. 3, the secondary side semiconductor device D1、D4、D5And D8Conducting, secondary side semiconductor device D2、D3、D6And D7Turning off;
0.5ts≤t≤0.75tswhen, as shown in FIG. 2, p2And p4Is high level, p1And p3Is low level, Q1And Q3On, Q2And Q4Off, as shown in FIG. 3, the secondary side semiconductor device D2、D3、D5And D8Conducting, secondary side semiconductor device D1、D4、D6And D7Turning off;
0.75ts≤t≤tswhen, as shown in FIG. 2, p2And p4Is high level, p2And p3Is low level, Q1And Q4On, Q2And Q3Off, as shown in FIG. 3, the secondary side semiconductor device D2、D3、D6And D7Conducting, secondary side semiconductor device D1、D4、D5And D8And (6) turning off.
Q in the first resonant channel, as shown in FIG. 21Trigger signal p1A pulse width modulation PWM signal with the duty ratio of 50 percent; q in the second resonant channel2Trigger signal p2Is a PWM signal with a duty ratio of 50 percent, p2Frequency of p and1are equal in frequency, p2Initial phase ratio p of1180 degrees after the initial phase lag; in the third resonant channel, Q3Trigger signal p3Is a PWM signal with a duty cycle of 50%, p3Lags behind Q3The initial phase of the original trigger signal is 90 degrees; q in the fourth resonant channel4Trigger signal p4Is a PWM signal with a duty cycle of 50%, p4Lags behind Q4Initial phase of original trigger signal 180 DEG, passAccording to the arrangement, a 180-degree staggered working mode is formed between the first resonant channel and the second resonant channel, a 180-degree staggered working mode is formed between the third resonant channel and the fourth resonant channel, a 90-degree staggered working mode is formed between the first resonant channel and the third resonant channel, and a 270-degree staggered working mode is formed between the first resonant channel and the fourth resonant channel.
In the above-mentioned operating mode, the resonant current ir1Resonant current ir2Resonant current ir3And a resonant current ir4The current waveform of (a) is shown in fig. 3; the current waveforms of the secondary side semiconductor devices D1-D8 are shown in FIG. 4. The current ripple diagram on the output filter capacitor of the traditional full-bridge LLC resonant converter is shown in fig. 5, the current ripple shown in fig. 6 can be obtained by the interleaved four-channel LLC resonant converter with low current ripple according to the embodiment of the invention, and the reduction effect of the current ripple is very obvious as can be seen from the peak-valley value.
The invention adopts 4 primary side semiconductor devices and 8 secondary side semiconductor devices, and the two devices are provided with 4 LLC resonant channels for providing electrical isolation for the primary side and the secondary side, the resonant parameters of the 4 resonant channels can be the same, and the 4 resonant channels form mutually staggered working states, so that low current ripples can be output, and the output of a filter capacitor is reduced; because 4 channels bear 25% of total output power respectively, the power of each channel is small, and the current stress of the secondary side diode is small; because the power of the 4 channels is low, the high-frequency resonant cavity can work at a high frequency, and the volume of a resonant device in the resonant channel is reduced.
According to the technical scheme, the interleaved four-channel low-current ripple LLC resonant converter provided by the embodiment of the invention charges the lead-acid battery through the four interleaved resonant channels, effectively weakens the output measured current ripple, prolongs the service life of the lead-acid energy storage battery, and simultaneously can reduce the volume and cost of the output filter capacitor, thereby being beneficial to reducing the volume of a passive device and improving the power density of the passive device.
The above embodiment is only one example of the LLC resonant converter with dual voltage gain curves, and is not intended to be used to describe all applications of the present invention in general, and the scope of the claims of the present invention should not be limited thereby.

Claims (5)

1. An interleaved four-channel low-current ripple LLC resonant converter is characterized by comprising four resonant channels and a load part,
the first resonant channel is composed of a primary side semiconductor switching device Q1Resonant capacitor Cr1Resonant inductor Lr1Transformer T1Diode D1And a diode D2Composition is carried out; the second resonant channel is composed of a primary side semiconductor switching device Q2Resonant capacitor Cr2Resonant inductor Lr2Transformer T2Rectifier diode D3And a rectifier diode D4Composition is carried out; the third resonant channel is composed of a primary side semiconductor switching device Q3Resonant capacitor Cr3Resonant inductor Lr3Transformer T3Rectifier diode D5And a rectifier diode D6Composition is carried out; the fourth resonant channel is composed of a primary side semiconductor switching device Q4Resonant capacitor Cr4Resonant inductor Lr4Transformer T4Rectifier diode D7And a rectifier diode D8Composition is carried out;
the load part comprises a capacitive filter CoAnd an equivalent load resistance Ro；
Said Q1And said Q2In series, said Q1Is connected to a voltage source UinThe positive electrode of (1), the Q2Is connected to the UinThe negative electrode of (1), the T1One end of the primary winding is connected with the C in seriesr1Is then connected to the UinThe positive electrode of (1), the positive electrode of (T)1The other end of the primary winding is connected in series with the Lr1Post-connected to said Q1And said Q2A node a between, the T2One end of the primary winding is connected in series with the Lr2Is then connected to the node a, the T2Of a primary sideThe other end of the winding is connected with the C in seriesr2Is then connected to the UinThe negative electrode of (1);
said Q3And said Q4In series, said Q3Is connected to the UinThe positive electrode of (1), the Q4Is connected to the UinThe negative electrode of (1), the T3One end of the primary winding is connected with the C in seriesr3Is then connected to the UinThe positive electrode of (1), the positive electrode of (T)3The other end of the primary winding is connected in series with the Lr3Post-connected to said Q3And said Q4Node b in between, the T4One end of the primary winding is connected in series with the Lr4Is then connected to the node b, the T4The other end of the primary winding is connected in series with the Cr4Is then connected to the UinThe negative electrode of (1);
the T is1Comprising 2 secondary windings, T1One secondary winding of (2) is connected with the D1The anode of (a), the T1Is connected to said D2The anode of (D)1And the cathode and the anode2Are all connected to an output voltage UoThe positive electrode of (1);
the T is2Comprising 2 secondary windings, T2One secondary winding of (2) is connected with the D3The anode of (a), the T2Is connected to said D4The anode of (D)3And the cathode and the anode4Are all connected to an output voltage UoThe positive electrode of (1);
the T is3Comprising 2 secondary windings, T3One secondary winding of (2) is connected with the D5The anode of (a), the T3Is connected to said D6The anode of (D)5And the cathode and the anode6Are all connected to an output voltage UoThe positive electrode of (a) a positive electrode,
the T is4Comprising 2 secondary windings, T4One secondary winding of (2) is connected with the D7The anode of (a), the T4Is connected to said D8Of yang (Yang)A pole, said D7And the cathode and the anode8Are all connected to an output voltage UoThe positive electrode of (a) a positive electrode,
the T is1Of said center-tapped winding, said T2Of said center-tapped winding, said T3Of said center-tapped winding, said T4Are all connected to the UoThe negative electrode of (1), the positive electrode of (C)oAre respectively connected to the UoOf two poles of (A), said RoAnd said CoThe two are connected in parallel,
excitation inductance Lm1Is connected to the T12 primary windings of the transformer, an excitation inductance Lm2Is connected to the T22 primary windings of the transformer, an excitation inductance Lm3Is connected to the T32 primary windings of the transformer, an excitation inductance Lm4Is connected to the T42 primary windings.
2. The interleaved four channel low current ripple LLC resonant converter of claim 1, wherein said Q1Trigger signal p1A pulse width modulation PWM signal with the duty ratio of 50 percent;
said Q2Trigger signal p2Is a PWM signal with a duty cycle of 50%, p2Frequency of (d) and said p1Is equal in frequency, said p2Is greater than the initial phase of p1180 degrees after the initial phase lag;
said Q3Trigger signal p3Is a PWM signal with a duty cycle of 50%, p3Lags behind the Q3The initial phase of the original trigger signal is 90 degrees;
said Q4Trigger signal p4Is a PWM signal with a duty cycle of 50%, p4Lags behind the Q4The initial phase of the original trigger signal is 180 degrees, so that a 180-degree staggered working mode is formed between the first resonant channel and the second resonant channel, a 180-degree staggered working mode is formed between the third resonant channel and the fourth resonant channel, and the second resonant channelA90-degree staggered working mode is formed between one resonant channel and the third resonant channel, and a 270-degree staggered working mode is formed between the first resonant channel and the fourth resonant channel.
3. The interleaved four channel low current ripple LLC resonant converter of claim 1, wherein t issIs the switching period of the semiconductor switching device on the primary side, frIs a resonant frequency, CrIn order to be a resonant capacitor, the resonant capacitor,
Figure FDA0003068634750000031
Figure FDA0003068634750000032
Cr1＝Cr2＝Cr3＝Cr4＝Cr
Lr1＝Lr2＝Lr3＝Lr4＝Lr。
4. the interleaved four channel low current ripple LLC resonant converter of claim 1,
0≤t≤0.25tswhen is, the p is1And said p3At a high level, said p2And said p4At a low level, the Q2And said Q4Is turned on, the Q1And said Q3Off, said D1D the above4D the above6And said D7Is turned on, D2D the above3D the above5And said D8Turning off;
0.25ts≤t≤0.5tswhen is, the p is1And said p4At a high level, said p2And said p3At a low level, the Q2And said Q3On, Q1And Q4The power is turned off and the power is turned off,said D1D the above4D the above5And said D8Is turned on, D2D the above3D the above6And said D7Turning off;
0.5ts≤t≤0.75tswhen is, the p is2And said p4At a high level, said p1And said p3At a low level, the Q1And said Q3Is turned on, the Q2And said Q4Off, said D2D the above3D the above5And said D8Is turned on, D1D the above4D the above6And said D7Turning off;
0.75ts≤t≤tswhen is, the p is2And said p4At a high level, said p2And said p3At a low level, the Q1And said Q4Is turned on, the Q2And said Q3Off, said D2D the above3D the above6And said D7Is turned on, D1D the above4D the above5And said D8And (6) turning off.
5. The interleaved four channel low current ripple LLC resonant converter of claim 1, wherein said T is1Has a winding transformation ratio of nT1Said T is2Has a winding transformation ratio of nT2Said T is3Has a winding transformation ratio of nT3Said T is4Has a winding transformation ratio of nT4；
Current iQ1To flow through the Q1Current of, current iQ2To flow through the Q2Current of, current iQ3To flow through the Q3Current of, current iQ4To flow through the Q4The current of (a) is measured,
current im1Is said T1Excitation current of, current im2Is said T2Excitation current of, current im3Is said T3Excitation current of, current im4Is said T4The current of the magnetic field sensor,
current ir1Is the resonant current of the first resonant channel, current ir2Is the resonant current of the second resonant channel, current ir3Is the resonant current of the third resonant channel, current ir4Is the resonant current of the fourth resonant channel, current iD1Is said D1Current of, current iD2Is said D2Current of, current iD3Is said D3Current of, current iD4Is said D4Current of, current iD5Is said D5Current of, current iD6Is said D6Current of, current iD7Is said D7Current of, current iD8Is said D8The current of (a) is measured,
current ioFor the current after the four resonant channels are staggered, the current iCoIs the CoThe current of (2).
CN202110539485.1A 2021-05-17 2021-05-17 Interleaved four-channel low-current ripple LLC resonant converter Pending CN113328633A (en)

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CN108122664A (en) * 2018-02-08 2018-06-05 东南大学 Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates
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