CN106230268A - A kind of crisscross parallel LLC resonance DC/DC power inverter - Google Patents
A kind of crisscross parallel LLC resonance DC/DC power inverter Download PDFInfo
- Publication number
- CN106230268A CN106230268A CN201610774154.5A CN201610774154A CN106230268A CN 106230268 A CN106230268 A CN 106230268A CN 201610774154 A CN201610774154 A CN 201610774154A CN 106230268 A CN106230268 A CN 106230268A
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- parallel
- llc
- power inverter
- crisscross parallel
- circuit
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Classifications
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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
- 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
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of crisscross parallel LLC resonance DC/DC power inverter, it is characterized in that: comprise the LLC resonant converter output stage of two-way inlet highway voltage balance circuit and two-way crisscross parallel, two-way inlet highway voltage balance circuit comprises equilibrium electric capacity C1, C2 and unidirectional transient suppressor TV1, TV2, unidirectional transient suppressor TV1 and equilibrium electric capacity C1 is connected in parallel on a road LLC resonant converter output stage input, unidirectional transient suppressor TV2 and equilibrium electric capacity C2 and is connected in parallel on another road LLC resonant converter output stage input.The present invention uses two-way LLC power inverter Interleaving and Transformer Paralleling; input at power inverter adds equalizing circuit to reduce the changer inlet highway imbalance problem that caused by the physical parameter difference of power device and the output current-unbalance problem of output rectification circuit, and to power device bus unbalance excessive in the case of protect.
Description
Technical field
The present invention relates to a kind of power inverter, particularly a kind of crisscross parallel LLC resonance DC/DC power inverter.
Background technology
Along with charging electric vehicle technology and the high speed development of high frequency switch power, high-power, high efficiency, high power are close
Degree, the charging equipment of electric automobile of wide operating range have become as development trend.LLC controlled resonant converter is soft as a kind of high frequency
Switch converters, while ensureing high frequency efficient rate, has again wide working range, is highly suitable for electric car charger
Design.But single channel LLC changer output current ripple when being designed to high power converter is big, and output filter capacitor often needs
Want many electric capacity parallel connections, volume, weight and the life-span of system is brought the biggest challenge.Crisscross parallel LLC changer has
The advantages such as output ripple is little, filter capacitor is few, therefore start to be widely used in automobile charger.
In the ideal case, if two-way LLC resonant element physical parameter identical, then converted by two-way LLC
The current amplitude of device is essentially identical.And often there is the error of maximum 5% in practical devices.This must cause changer at actual motion
During, the running status of upper and lower two-way LLC there are differences.For worst case, if the LLC changer device of positive bus-bar side
Having the parameter error of+5%, the LLC changer device of negative busbar side has the parameter error of-5%.This error will be enlarged by bus
Voltage unbalance factor between electric capacity C1 two ends and between C2 two ends.If not being controlled by, LLC changer high-pressure MOS will be caused
The voltage stress of pipe is excessive.Also result in the pressure rising of pfc circuit part of devices.
Summary of the invention
The technical problem to be solved is to provide a kind of crisscross parallel LLC resonance DC/DC power inverter, its energy
Enough suppressing when bus capacitor C1 or C2 increases to limits value, protection power device is without damage.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
A kind of crisscross parallel LLC resonance DC/DC power inverter, it is characterised in that: comprise two-way inlet highway electric voltage equalization electricity
The LLC resonant converter output stage of road and two-way crisscross parallel, two-way inlet highway voltage balance circuit comprise equilibrium electric capacity C1,
C2 and unidirectional transient suppressor TV1, TV2, unidirectional transient suppressor TV1 and equilibrium electric capacity C1 are connected in parallel on a road LLC resonant transformation
It is defeated that device output stage input, unidirectional transient suppressor TV2 and equilibrium electric capacity C2 are connected in parallel on another road LLC resonant converter output stage
Enter end.
Further, described LLC resonant converter output stage includes square-wave generator, LLC resonance circuit and output rectification
Circuit.
Further, the alternate angle of the LLC resonant converter output stage of described two-way crisscross parallel is 90 degree.
Further, described square-wave generator is full-bridge or half-bridge circuit.
Further, described full-bridge or half-bridge circuit switching tube use MOSFET pipe.
Further, described LLC resonance circuit include series resonance inductor, series resonant capacitance, parallel resonant inductor and
Isolating transformer.
Further, described rectification circuit can be full-bridge rectification or centre tapped full-wave rectifying circuit.
Further, diode used by described rectification circuit is Schottky diode.
Further, the outfan Parallel opertation of the LLC resonant converter output stage of described two-way crisscross parallel.
Further, the outfan Parallel opertation parallel connection of the LLC resonant converter output stage of described two-way crisscross parallel sets
It is equipped with a filter capacitor C0.
The present invention compared with prior art, has the following advantages and effect: use two-way LLC power inverter crisscross parallel
Structure, the input at power inverter adds the change that equalizing circuit is caused by the physical parameter difference of power device with reduction
The output current-unbalance problem of parallel operation inlet highway imbalance problem and output rectification circuit, and power device is lost at bus
Weigh excessive in the case of protect；Can effectively reduce circulation loss, reduce input current ripple, improve delivery efficiency and power
Density, it is adaptable to the high-power high voltage direct current output application scenarios such as direct-current charging post.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment 1 of a kind of crisscross parallel LLC resonance DC/DC power inverter of the present invention.
Fig. 2 is the schematic diagram of the embodiment 2 of a kind of crisscross parallel LLC resonance DC/DC power inverter of the present invention.
Fig. 3 is the schematic diagram of the embodiment 3 of a kind of crisscross parallel LLC resonance DC/DC power inverter of the present invention.
MOS switch management and control square wave schematic diagram when Fig. 4 is the crisscross parallel of the present invention.
Fig. 5 is ideally crisscross parallel circuit and the oscillogram of noninterlace parallel circuit of the present invention.
Fig. 6 is that crisscross parallel LLC resonance DC/DC power inverter of the present invention is not adding the output current wave of equalizing circuit
Shape.
Fig. 7 is the crisscross parallel LLC resonance DC/DC output current of power converter ripple after the present invention adds equalizing circuit
Shape.
Fig. 8 is the switching frequency of the present invention LLC changer work wave equal to series resonance frequency.
Fig. 9 is the switching frequency of the present invention LLC changer operating wave between series resonance frequency and parallel resonance frequency
Shape.
Figure 10 is the switching frequency of the present invention LLC changer work wave more than resonant frequency.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following example are to this
Bright explanation and the invention is not limited in following example.
Embodiment 1:
A kind of crisscross parallel LLC resonance DC/DC power inverter, comprises two-way inlet highway voltage balance circuit and two-way is handed over
Wrong LLC resonant converter output stage in parallel, two-way inlet highway voltage balance circuit comprises equilibrium electric capacity C1, C2(C1 and C2
Parameter identical) identical with TV2 parameter with unidirectional transient suppressor TV1, TV2(TV1), unidirectional transient suppressor TV1 and equilibrium
Electric capacity C1 is connected in parallel on a road LLC resonant converter output stage input, unidirectional transient suppressor TV2 and equilibrium electric capacity C2 and is connected in parallel on
Another road LLC resonant converter output stage input.LLC resonant converter output stage includes square-wave generator, LLC resonance circuit
And output rectification circuit.LLC resonance circuit includes that series resonance inductor, series resonant capacitance, parallel resonant inductor and isolation become
Depressor.Square-wave generator, by switching every time with 50% dutycycle driven metal-oxide-semiconductor Q1 and Q2 turn-on and turn-off, produces duty
Ratio is the square wave Vd of 50%, and square-wave generator can be full-bridge or half-bridge.LLC resonance circuit can filter out higher harmonic current,
Square-wave voltage is applied to resonance circuit, and (square-wave voltage puts on resonance to make electric current lag behind applying voltage over the resonant circuit
On the half-bridge of circuit), to ensure that no-voltage opens MOSFET.Output rectification circuit is adjusted by rectification circuit and filter capacitor and hands over
Stream output electric current, exports DC voltage.Commutated network can be designed to full-bridge or centre cap structure.LLC resonant converter
Circuit has two resonant frequencies, and one is the series resonance frequency of resonant inductance Lr and resonant capacitance Cr, and another is resonance electricity
Sense Lm is plus the parallel resonance frequency of Lr Yu Cr.
The present embodiment is crisscross parallel symmetrical half bridge LLC changer, the LLC resonant converter output stage of two-way crisscross parallel
Alternate angle be 90 degree.As shown in Figure 4, crisscross parallel is presented as the phase angle of drive waveforms of MOSFET pipe Q1 and MOSFET pipe Q3
Differing 90 degree, the phase angle of MOSFET pipe Q2 and MOSFET pipe Q4 differs 90 degree, MOSFET pipe Q1 and MOSFET pipe Q2 complementation conducting
(having certain dead band), MOSFET pipe Q3 and MOSFET pipe Q4 complementation conducting.
LLC resonance circuit includes series resonance inductor, series resonant capacitance, parallel resonant inductor and isolating transformer.Whole
Current circuit can be full-bridge rectification or centre tapped full-wave rectifying circuit.Diode D1 used by rectification circuit, D2, D3, D4, D5,
D6, D7, D8 are Schottky diode.The outfan Parallel opertation of the LLC resonant converter output stage of two-way crisscross parallel.Two-way
The outfan Parallel opertation of the LLC resonant converter output stage of crisscross parallel has been arranged in parallel a filter capacitor C0.
As it is shown in figure 5, output after full-bridge rectification when voltage U1, U2 respectively main road and bypass LLC work alone
Voltage waveform.Outfan parallel connection equivalence can become two voltage source parallel connections, thus the output voltage in each moment be in two-way
Big value, i.e. two-way LLC is connected in parallel staggered 90 degree voltage waveforms exported when running, bold portion in Fig. 5.Therefrom can see
After going out crisscross parallel, output voltage waveforms pulsation reduces.And the filter capacitor of more low capacity can be selected, reduce filter capacitor
Volume, improves power density.Additionally, staggered 90 degree is optimal stagger angle.
Compared with traditional LLC half bridge resonant, under equal output, the power of every road changer is only former
First half, it is simple to LLC DC/DC controlled resonant converter is in the power device type selecting of high-power applications occasion.Meanwhile, inductance capacitance
Constant power device is in the case of electric current doubles, no matter price or volume will exceed a lot, uses two-way in parallel
Pattern, can choose the power device that volume is less, price is more excellent, it is thus achieved that higher power density.
In the ideal case, if series resonance inductor Lr1 and Lr2 of two-way LLC resonant element, parallel resonant inductor Lm1
Identical with the physical parameter of Lm2, resonant capacitance Cr1 with Cr2, then by the basic phase of current amplitude of two-way LLC changer
With.And often there is the error of maximum 5% in practical devices.This must cause changer in actual moving process, upper and lower two-way LLC
Running status there are differences.For worst case, if the LLC changer device of positive bus-bar side has the parameter error of+5%,
The LLC changer device of negative busbar side has the parameter error of-5%.This error will be enlarged by between bus capacitor C1 two ends and C2
Voltage unbalance factor between two ends.If not being controlled by, by excessive for the voltage stress causing LLC changer high-voltage MOS pipe.Also
The pressure rising of pfc circuit part of devices can be caused.For the problems referred to above, can be in parallel at bus capacitor C1 and bus capacitor C2 two ends
Unidirectional transient suppressor TV1, TV2, suppress when bus capacitor C1 or C2 increases to limits value, and protection power device is not subject to
Damage.
It is illustrated in figure 6 crisscross parallel LLC resonance DC/DC power inverter and does not adds the output current wave of equalizing circuit
Shape.Can be seen that two output unbalanced degree of electric current I1 and I2 are higher, cause bigger output current ripple.It is illustrated in figure 7
Add the crisscross parallel LLC resonance DC/DC output current of power converter waveform after equalizing circuit.It can be seen that there is being equilibrium
In the case of circuit, two output electric current I1 and I2 equilibrium degree are higher, and the ripple of output electric current is also obviously reduced.
Fig. 8, Fig. 9, Figure 10 are that switching frequency is equal to series resonance frequency, switching frequency in series resonance frequency and also respectively
Between connection resonant frequency, switching frequency is more than the LLC changer work wave of resonant frequency, it can be seen that LLC changer is at this
In the case of three kinds, to be no-voltage open-minded for metal-oxide-semiconductor, effectively reduces switching loss.Appropriate design resonant network Cr1, Cr2, Lr1,
Lm1 and Cr3, the parameter of Cr4, Lr2, Lm2 can make switch mosfet pipe Q1, Q2, Q3, Q4 can realize in full operating range
Sofe Switch, improves the conversion efficiency of changer.
Embodiment 2:
As in figure 2 it is shown, embodiment 2 is compared with Example 1, it is crisscross parallel full-bridge LLC changer, rather than crisscross parallel is symmetrical
Half-bridge LLC changer.The input side of crisscross parallel full-bridge LLC resonant converter includes equalizing electric capacity C1 and C2, and with equilibrium
Transient Voltage Suppressor TV1 and TV2 that electric capacity is in parallel.Full-bridge converter switching tube Q1 and Q4 synchronizes conducting, Q2 and Q3 synchronizes to lead
Logical, Q1 and Q3 complementation turns on, Q2 and Q4 complementation turns on.Full-bridge converter switching tube uses MOSFET.Crisscross parallel full-bridge LLC becomes
Parallel operation, the device parameters of two-way full-bridge LLC changer is consistent in design, and the parameter such as resonant capacitance Cr1 with Cr2 is consistent, string
The parameter of connection resonant inductance Lr1 with Lr2 is consistent, and parallel resonant inductor Lm1 and Lm2 parameter is consistent, the parameter of transformator T1 and T2
Unanimously, the parameter of full bridge rectifier is consistent.
Embodiment 3:
As it is shown on figure 3, embodiment 3 is compared with Example 1, it is crisscross parallel asymmetrical half-bridge LLC changer.Described staggered also
The input side of connection full-bridge LLC resonant converter includes equalizing electric capacity C1 and C2, and the transient voltage in parallel with Jun Heng electric capacity presses down
Device TV1 and TV2 processed.Full-bridge converter switching tube Q1 and Q2 complementation conducting.Half-bridge converter switching tube uses MOSFET.Interlock also
Connection asymmetrical half-bridge LLC changer, the device parameters of two-way LLC changer is consistent, such as resonant capacitance Cr1 and Cr2 in design
Parameter consistent, the parameter of series resonance inductor Lr1 with Lr2 is consistent, and parallel resonant inductor Lm1 and Lm2 parameter is consistent, transformator
The parameter of T1 with T2 is consistent, and the parameter of full bridge rectifier is consistent.
Above content described in this specification is only illustration made for the present invention.Technology belonging to the present invention
Described specific embodiment can be made various amendment or supplements or use similar mode to substitute, only by the technical staff in field
The guarantor of the present invention all should be belonged to without departing from the content of description of the invention or surmount scope defined in the claims
Protect scope.
Claims (10)
1. a crisscross parallel LLC resonance DC/DC power inverter, it is characterised in that: comprise two-way inlet highway electric voltage equalization
The LLC resonant converter output stage of circuit and two-way crisscross parallel, two-way inlet highway voltage balance circuit comprises equilibrium electric capacity
C1, C2 and unidirectional transient suppressor TV1, TV2, unidirectional transient suppressor TV1 and equilibrium electric capacity C1 are connected in parallel on a road LLC resonance and become
Parallel operation output stage input, unidirectional transient suppressor TV2 and equilibrium electric capacity C2 are connected in parallel on another road LLC resonant converter output stage
Input.
2. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 1, it is characterised in that: described
LLC resonant converter output stage includes square-wave generator, LLC resonance circuit and output rectification circuit.
3. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 1, it is characterised in that: described
The alternate angle of the LLC resonant converter output stage of two-way crisscross parallel is 90 degree.
4. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 2, it is characterised in that: described
Square-wave generator is full-bridge or half-bridge circuit.
5. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 4, it is characterised in that: described
Full-bridge or half-bridge circuit switching tube use MOSFET pipe.
6. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 2, it is characterised in that: described
LLC resonance circuit includes series resonance inductor, series resonant capacitance, parallel resonant inductor and isolating transformer.
7. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 2, it is characterised in that: described
Rectification circuit can be full-bridge rectification or centre tapped full-wave rectifying circuit.
8. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 7, it is characterised in that: described
Diode used by rectification circuit is Schottky diode.
9. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 1, it is characterised in that: described
The outfan Parallel opertation of the LLC resonant converter output stage of two-way crisscross parallel.
10. according to a kind of crisscross parallel LLC resonance DC/DC power inverter described in claim 9, it is characterised in that: described
The outfan Parallel opertation of the LLC resonant converter output stage of two-way crisscross parallel has been arranged in parallel a filter capacitor C0.
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| CN201610774154.5A CN106230268A (en) | 2016-08-31 | 2016-08-31 | A kind of crisscross parallel LLC resonance DC/DC power inverter |
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| CN107147313A (en) * | 2017-05-27 | 2017-09-08 | 郑州云海信息技术有限公司 | A kind of server power supply design method using series interleaved structure |
| CN107612340A (en) * | 2017-09-18 | 2018-01-19 | 电子科技大学 | A kind of low voltage stress isolating full-bridge converter circuit arrangement |
| CN107800320A (en) * | 2017-09-27 | 2018-03-13 | 深圳市保益新能电气有限公司 | A kind of circuit control method |
| CN108306514A (en) * | 2018-03-09 | 2018-07-20 | 深圳市高斯宝电气技术有限公司 | A kind of DC-DC converter of fuel cell |
| CN108599576A (en) * | 2018-05-18 | 2018-09-28 | 深圳市科华恒盛科技有限公司 | A kind of full-bridge LLC circuits |
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| CN114244122A (en) * | 2021-11-24 | 2022-03-25 | 北京动力源科技股份有限公司 | Half-bridge LLC constant-power wide-range converter topology and circuit |
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