CN101552557B - Parallel-connected resonance converter circuit and control method thereof - Google Patents
Parallel-connected resonance converter circuit and control method thereof Download PDFInfo
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- CN101552557B CN101552557B CN2008100906379A CN200810090637A CN101552557B CN 101552557 B CN101552557 B CN 101552557B CN 2008100906379 A CN2008100906379 A CN 2008100906379A CN 200810090637 A CN200810090637 A CN 200810090637A CN 101552557 B CN101552557 B CN 101552557B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention provides a parallel-connected resonance converter circuit which comprises a plurality of resonance converters, and each resonance converter is provided with two input ends and two outputends, wherein the two input ends of each resonance converter are connected in series with the two input ends of other resonance converter, and the two output ends of each resonance converter are conn ected in parallel with the two output ends of other resonance converter.
Description
Technical field
The present invention proposes the circuit and the control method thereof of a kind of resonance DC/direct current (DC/DC) transducer parallel connection, can be in the current-sharing that realizes under the situation that each converter switch frequency equates between the transducer.
Background technology
The development trend of DC/DC transducer is the same as most power supply product, develops towards high efficiency direction.Resonance DC/DC transducer is owing to the characteristic of its soft handover, than being easier to realize high efficiency.Yet still there are some defectives in resonance DC/DC transducer, and for example: the electric current AC value in the series resonance DC/DC transducer output filter is high, causes output filter loss and volume bigger.
Fig. 1 (a)-Fig. 1 (d) is several kinds of typical resonance DC/DC converter circuit structures.Comprise a DC power supply among Fig. 1 (a), be used to provide input voltage V
In, first and second switch S1-S2, capacitor C
sWith C
o, an inductance L
s, transformer T, diode D1-D2 and a load R
o, be used to provide output voltage V
oThe different elementary parallelly connected capacitor C that are this transformer T of Fig. 1 (b) and Fig. 1 (a)
p, S1-S2 and L in addition
sBetween reduced capacitor C
s, and sub section D1 and the C of this transformer T
oBetween increase an inductance L
rDifferent this S1-S2 and the L of being of Fig. 1 (c) and Fig. 1 (b)
sBetween increased capacitor C
sThe different elementary parallelly connected magnetizing inductance L that are this transformer T of Fig. 1 (d) and Fig. 1 (a)
mLLC series resonance DC/DC transducer with shown in Fig. 1 (d) is an example, and the work wave of its groundwork pattern is as shown in Figure 2.S1 and S2 are the drive signals of switch S 1-S2, i
sWith i
mBe respectively the resonant inductance L that flows through
sWith magnetizing inductance L
mElectric current, i
mBreaking off value constantly at switch S 1, S2 is respectively I
mWith-I
m, V
Ds1Be that switch S 1 is leaked level to the voltage between its source electrode, i
D1, i
D2Be respectively the current waveform of output rectifier diode D1 and D2, I
oBe the output current of transducer, i
D1+ i
D2-I
oFlow through output filter (output capacitance) C exactly
oElectric current, V
CsIt is capacitor C
sVoltage, its waveform in each cycle, be divided into six intervals (t0-t1, t1-t2 ..., t5-t6), since the 7th interval repetitive cycling (t6=t0).Can find out from these waveforms, because i
D1, i
D2Bigger ripple is arranged, and the difference of its peak value and mean value is bigger, causes output filter (output capacitance) C
oMiddle current effective value is bigger, thereby has increased loss or the volume of Co.
In order to reduce output filter (output capacitance) Co current effective value, the working method of a plurality of resonance converter crisscross parallels is one of effective ways of using always.Yet because the control characteristic of resonance converter, the crisscross parallel of resonance converter is difficult to be realized.
The working method of this crisscross parallel requires the input of two or more transducers and output to be connected in parallel separately; Under identical switching frequency, through setting the phase difference of each transducer, total voltage or some alternating current component in the total current behind the superposition are cancelled out each other, thereby reduce volume or the loss of output filter (output capacitance) Co.The crisscross parallel method in pulse-width modulation (PWM) transducer of fixed frequency by extensive employing; Because under the constant situation of switching frequency; The PWM transducer can be easy to realize current-sharing between each parallelly connected transducer through changing duty recently regulation voltage and electric current.In resonance converter, the adjusting of voltage and current realizes through changing switching frequency, uses identical switching frequency if the resonance converter of parallel connection is forced, owing to possibly there be characteristic difference, is difficult to realize current-sharing between each transducer; Otherwise if regulation voltage and electric current are to realize current-sharing separately for each transducer, they can't remain on identical switching frequency, thereby lose the advantage of crisscross parallel.
In order to solve the problems of the technologies described above, the present invention proposes a kind of resonance converter circuit that is connected in parallel and control method thereof.
Summary of the invention
The present invention proposes a kind of circuit and control method thereof of resonance DC/DC transducer parallel connection, can be in the current-sharing that realizes under the situation that each converter switch frequency equates between the transducer.
The present invention proposes a kind of resonance converter circuit that is connected in parallel; Comprise a plurality of resonance converters; Each resonance converter has two inputs and two outputs; Wherein two inputs of two of each resonance converter each resonance converters of input and other are connected; Two outputs of two each resonance converters of output and other of
each resonance converter are parallelly connected; The switching frequency of each resonance converter is identical; The difference of the output current between each resonance converter only is decided by the difference of each resonance converter direct voltage gain, and under current intelligence, can reach balance point automatically; One has the DC power supply of a positive pole and a negative pole, an output capacitance and a plurality of input capacitance; Wherein each input capacitance is parallel to two inputs of a particular converter in these a plurality of resonance converters; Output capacitance is parallel to two outputs of each resonance converter; Each input capacitance has one first end and one second end; First end of first input capacitance is coupled in positive source in these a plurality of input capacitances; Each electric capacity second end of last penult input capacitance all is coupled in first end of next input capacitance from first input capacitance to a plurality of input capacitances, and second end of last input capacitance is coupled in power cathode in these a plurality of input capacitances.
According to above-mentioned conception, each resonance converter is a series-resonant direct-current/direct-current transducer, or a parallel resonance DC-DC converter.
According to above-mentioned conception, this series-resonant direct-current/direct-current transducer is a LLC series-resonant direct-current/direct-current transducer.
According to above-mentioned conception, this parallel resonance DC-DC converter is a LCC parallel resonance DC-DC converter.
According to above-mentioned conception, these a plurality of resonance converters work in staggered mode of operation.
The present invention proposes a kind of resonance converter circuit that is connected in parallel; Comprise one first resonance converter; Have two inputs and two outputs, one second resonance converter has two inputs and two outputs; Wherein two of this second resonance converter inputs are connected with two inputs of first resonance converter, and two outputs of this second resonance converter are parallelly connected with two outputs of first resonance converter; One has the DC power supply of a positive pole and a negative pole, an output capacitance and first and second input capacitance; Wherein this first input capacitance is parallelly connected with two inputs of first resonance converter; This output capacitance is parallelly connected with two outputs of this second resonance converter with first; This first with this second input capacitance all have one first end and one second end; First end of this first input capacitance is coupled in positive source; Second end of this first input capacitance is coupled in first end of second input capacitance, and second end of this second input capacitance is coupled in power cathode, and this is first identical with the switching frequency of this second resonance converter; This first and this second resonance converter between the difference of output current only be decided by this first with the difference of this second resonance converter direct voltage gain, and under current intelligence, can reach balance point automatically.
According to above-mentioned conception, this first resonance converter works in staggered mode of operation with this second resonance converter.
According to above-mentioned conception, this resonance converter is a LLC series-resonant direct-current/direct-current transducer.
The present invention proposes a kind of control method of the resonance converter circuit that is connected in parallel; Wherein this circuit comprises a plurality of resonance converters; Each resonance converter has two inputs and two outputs; Two inputs of two each resonance converters of input and all the other of each resonance converter are connected; And two outputs of two each resonance converters of output and all the other of each resonance converter are parallelly connected, comprise the following step: when the output current of two outputs of a particular resonance transducer in a plurality of resonance converters of flowing through raise, the input current of two inputs of feasible this particular resonance transducer of flowing through also raise; When the input current of two inputs of this particular resonance transducer of flowing through raises, make the input voltage of two inputs of this particular resonance transducer reduce; When the input voltage of two inputs of this particular resonance transducer reduces, make that the input voltage of two inputs of all the other each resonance converters raises in these a plurality of resonance converters; When the input voltage of two inputs of remaining each resonance converter in these a plurality of resonance converters raises, make that the output current of two outputs of remaining each resonance converter raises in these a plurality of resonance converters; And when the output current of two outputs of all the other each resonance converters in the output current of two outputs of this particular resonance transducer of flowing through and these a plurality of resonance converters reaches balance again, then stop.
According to above-mentioned conception; This then stops step and also comprises: when the inverse that equals the direct voltage gain of this particular resonance transducer when the ratio between the output current of two outputs of another resonance converter in the output current of two outputs of this particular resonance transducer of flowing through and this a plurality of resonance converters multiply by the direct voltage gain of another resonance converter, this particular resonance transducer and this another resonance converter reached balance between the two again.
According to above-mentioned conception; These a plurality of resonance converters comprise first and second resonance converter; This particular resonance transducer is this second resonance converter; This then stops step and also comprises: when the inverse that equals the direct voltage gain of this second resonance converter when the ratio between the output current of this two outputs of the output current of two outputs of this second resonance converter of flowing through and this first resonance converter multiply by the direct voltage gain of this first resonance converter, this first reached balance between the two with this second resonance converter again.
According to above-mentioned conception, these a plurality of resonance converters work in staggered mode of operation.
In order to let above-mentioned purpose of the present invention, characteristic and the advantage can be more obviously understandable, enumerate embodiment below, and conjunction with figs., elaborate as follows:
Description of drawings
Fig. 1 (a): the circuit diagram of series resonance DC/DC transducer;
Fig. 1 (b): the circuit diagram of parallel resonance DC/DC transducer;
Fig. 1 (c): the circuit diagram of LCC parallel resonance DC/DC transducer;
Fig. 1 (d): the circuit diagram of LLC series resonance DC/DC transducer;
Fig. 2: the working waveform figure of LLC series resonance DC/DC transducer;
Fig. 3: circuit diagram with N resonance converter crisscross parallel;
Fig. 4: circuit diagram with two resonance converter crisscross parallels;
Fig. 5: circuit diagram with two resonance converter crisscross parallels; And
Fig. 6: working waveform figure with circuit of two resonance converter crisscross parallels.
Embodiment
The present invention adopts circuit structure as shown in Figure 3, and it is a circuit diagram with N resonance converter crisscross parallel; Comprise a DC power supply, be used to provide input voltage V
In, input capacitance C1-Cn, first resonance converter to the N resonance converter, and an output capacitance Co are used to provide output voltage V
o, can realize parallel connection simply with resonance DC/DC transducer under the frequency situation.The direct current input series connection of each resonance DC/DC transducer, output-parallel, and its switching frequency is identical.
Parallel connection with two-way is its operation principle of example explanation, and as shown in Figure 4, it comprises a DC power supply V
In, first and second resonance converter, first input and one second input capacitance C1-C2, and output capacitance C
o, be used to provide output voltage V
o
V wherein
In1, V
In2Represent respectively this first with the input voltage of this second resonance converter, I
In1, I
In2Be respectively flow into this first with the DC quantity of the electric current of this second resonance converter, I
O1, I
O2Be respectively this first with the DC quantity of the output current of this second resonance converter.If M1, M2 be respectively this first with the direct voltage gain of this second resonance converter, i.e. M1=V
o/ V
In1, M2=V
o/ V
In2, then under stable state,, I is arranged according to the conservation of energy
O1=I
In1/ M1, I
O2=I
In2/ M2.Because this first connects I under stable state with the input of this second resonance converter
In1=I
In2So, I
O1/ I
O2=M2/M1=V
In1/ V
In2
If this of two parallel connections first is same type with this second transducer and has identical design parameter; Reason owing to the intraware discreteness; The gain of two transducers is different under the same switch frequency; Then output current is also different, but the error of two output currents only is decided by the error of two transducer gains.
If this of two parallel connections first is same type with this second resonance converter but has different design parameters; Or this first with this second resonance converter be dissimilar; Then under same frequency this first with the gain of this second resonance converter maybe be different; Then output current also maybe be different, but the difference of two output currents only be decided by this first with the difference of this second resonance converter gain.And this moment is because this of two parallel connections first is connected in parallel so its input voltage V with the output of this second resonance converter
In2, V
In1Also form pro rate according to its gain.
No matter be the parallel connection of above which kind of type, under current intelligence, suppose the feasible I at a time of disturbance of an outside
O1/ I
O2＞M2/M1, i.e. I
O1Electrorheological is big, then can cause I
In1＞I
In2Thereby, make V
In1Reduce V
In2Raise, force I
O2Rising is up to I
O1/ I
O2=M2/M1 reaches balance point again.So this circuit have autobalance this first with the ability of this second resonance converter output current.
Fig. 4 is a circuit diagram with two resonance converter crisscross parallels.In circuit structure shown in Figure 4, first and second resonance converter of two parallel connections can have identical switching frequency, therefore can realize crisscross parallel at an easy rate, reduces output filter (output capacitance) C
oLoss and volume.The difference of the output current of two-way only be decided by this first with the difference of this second resonance converter gain, and under current intelligence, can reach balance point automatically.
In like manner, in circuit structure shown in Figure 3, first of a plurality of parallel connections can have identical switching frequency to the N resonance converter, therefore can realize crisscross parallel at an easy rate, reduce output filter (output capacitance) C
oLoss and volume.The difference of the output current between each road only is decided by the difference of each resonance converter gain, and under current intelligence, can reach balance point automatically.
Fig. 5 is the LLC series resonance DC/DC transducer of two crisscross parallels, comprises a DC power supply, is used to provide input voltage V
In, first to fourth switch S 1-S4, capacitor C 1-C2, Cs1-Cs2 and C
o, inductance L
S1-L
S2, L
M1-L
M2, transformer T1-T2 and diode D1-D4, and output voltage V is provided
oFig. 6 is the work wave of this circuit, and S1, S2, S3 and S4 are the drive signals of switch S 1-S4, i
D1, i
D2, i
D3With
D4Be respectively the current waveform of rectifier diode D1, D2, D3 and D4, I
oBe the DC quantity of total output current, i
D1+ i
D2+ i
D3+ i
D4-I
oFlow through output filter (output capacitance) C exactly
oAlternating current.Can find out that by Fig. 6 the LLC series resonance DC/DC transducer of crisscross parallel greatly reduces and flows through filter (output capacitance) C
oThe alternating current effective value, thereby reduced volume and the loss of output filter (output capacitance) Co.
In sum, the present invention proposes a kind of circuit and control method thereof of resonance DC/DC transducer parallel connection, can realize current-sharing preferably between the transducer under the situation that each converter switch frequency equates, thereby its progressive and novelty are arranged really.
Though the foregoing description has been described execution mode of the present invention, the technical staff who is familiar with in this area can make various distortion or modification in the scope of affiliated claim.Scope of patent protection of the present invention still must be defined with the appending claims scope and is as the criterion.
Claims (14)
1. resonance converter circuit that is connected in parallel comprises:
A plurality of resonance converters; Each resonance converter has two inputs and two outputs; Wherein two inputs of two of each resonance converter each resonance converters of input and other are connected; Two outputs of two each resonance converters of output and other of each resonance converter are parallelly connected; The switching frequency of each resonance converter is identical, and the difference of the output current between each resonance converter only is decided by the difference of each resonance converter direct voltage gain, and under current intelligence, can reach balance point automatically;
A DC power supply has a positive pole and a negative pole;
An output capacitance; And
A plurality of input capacitances,
Wherein each input capacitance is connected in parallel on two inputs of a particular converter in a plurality of resonance converters; Output capacitance is connected in parallel on two outputs of each resonance converter; Each input capacitance has one first end and one second end; First end of first input capacitance is coupled in positive source in these a plurality of input capacitances; Each electric capacity second end of last penult input capacitance all is coupled in first end of next input capacitance from first input capacitance to these a plurality of input capacitances, and second end of last input capacitance is coupled in power cathode in these a plurality of input capacitances.
2. circuit as claimed in claim 1; When wherein a particular resonance transducer and another resonance converter reached balance point between the two, the ratio in the output current of this two output of this particular resonance transducer of flowing through and this a plurality of resonance converters between the output current of two outputs of another resonance converter equaled the direct voltage gain that the inverse of the direct voltage gain of this particular resonance transducer multiply by another resonance converter.
3. circuit as claimed in claim 1, wherein each resonance converter is a series-resonant direct-current/direct-current transducer, or a parallel resonance DC-DC converter.
4. circuit as claimed in claim 3, wherein this series-resonant direct-current/direct-current transducer is a LLC series-resonant direct-current/direct-current transducer.
5. circuit as claimed in claim 3, wherein this parallel resonance DC-DC converter is a LCC parallel resonance DC-DC converter.
6. according to claim 1 circuit, wherein these a plurality of resonance converters work in staggered mode of operation.
7. resonance converter circuit that is connected in parallel comprises:
First resonance converter has two inputs and two outputs;
Second resonance converter has two inputs and two outputs;
A DC power supply has a positive pole and a negative pole;
An output capacitance;
One first input capacitance has one first end and one second end; And
One second input capacitance has one first end and one second end,
Wherein two of this second resonance converter inputs are connected with two inputs of first resonance converter; Two outputs of this second resonance converter are parallelly connected with two outputs of first resonance converter; This first input capacitance is parallelly connected with two inputs of first resonance converter; This output capacitance is first parallelly connected with two outputs of this second resonance converter with this; First end of this first input capacitance is coupled in positive source; Second end of this first input capacitance is coupled in first end of this second input capacitance, and second end of this second input capacitance is coupled in power cathode, and this is first identical with the switching frequency of this second resonance converter; This first and this second resonance converter between the difference of output current only be decided by this first with the difference of this second resonance converter direct voltage gain, and under current intelligence, can reach balance point automatically.
8. circuit as claimed in claim 7; Wherein this first resonance converter and this second shakes transducer when reaching balance point between the two, the inverse that the ratio between the output current of the output current of this two output of this first resonance converter of flowing through and two outputs of this second resonance converter equals the direct voltage gain of this first resonance converter multiply by this second shake transducer the direct voltage gain.
9. circuit as claimed in claim 7, wherein this first resonance converter works in staggered mode of operation with this second resonance converter.
10. circuit as claimed in claim 7, wherein this resonance converter is a LLC series-resonant direct-current/direct-current transducer.
11. the control method of a resonance converter circuit that is connected in parallel; Wherein this circuit comprises a plurality of resonance converters; Each resonance converter has two inputs and two outputs; Two inputs of two each resonance converters of input and all the other of each resonance converter are connected, and two outputs of two each resonance converters of output and all the other of each resonance converter are parallelly connected, comprise the following step:
When the output current of two outputs of a particular resonance transducer in a plurality of resonance converters of flowing through raise, the input current of two inputs of feasible this particular resonance transducer of flowing through raise;
When the input current of two inputs of this particular resonance transducer of flowing through raises, make the input voltage of two inputs of this particular resonance transducer reduce;
When the input voltage of two inputs of this particular resonance transducer reduces, make that the input voltage of two inputs of all the other each resonance converters raises in these a plurality of resonance converters;
When the input voltage of two inputs of all the other each resonance converters in these a plurality of resonance converters raises, make that the output current of two outputs of all the other each resonance converters raises in these a plurality of resonance converters; And
When the output current of two outputs of all the other each resonance converters in the output current of two outputs of this particular resonance transducer of flowing through and these a plurality of resonance converters reaches balance again, then stop.
12. method as claimed in claim 11; Wherein this then stops step and also comprises: when the inverse that equals the direct voltage gain of this particular resonance transducer when the ratio between the output current of two outputs of another resonance converter in the output current of two outputs of this particular resonance transducer of flowing through and this a plurality of resonance converters multiply by the direct voltage gain of another resonance converter, then this particular resonance transducer and this another resonance converter reached balance between the two again.
13. method as claimed in claim 11; Wherein these a plurality of resonance converters comprise first and second resonance converter; This particular resonance transducer is this second resonance converter; This then stops step and also comprises: when the inverse that equals the direct voltage gain of this second resonance converter when the ratio between the output current of two outputs of the output current of two outputs of this second resonance converter of flowing through and this first resonance converter multiply by the direct voltage gain of this first resonance converter, then this first reached balance between the two with this second resonance converter again.
14. method as claimed in claim 11, wherein these a plurality of resonance converters work in staggered mode of operation.
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| CN2008100906379A CN101552557B (en) | 2008-04-02 | 2008-04-02 | Parallel-connected resonance converter circuit and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522896A (en) * | 2008-04-02 | 2012-06-27 | 台达电子工业股份有限公司 | Parallel resonant converter circuit and control method thereof |
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| US9166489B2 (en) | 2009-02-27 | 2015-10-20 | Delta Electronics (Shanghai) Co., Ltd. | Layouts of multiple transformers and multiple rectifiers of interleaving converter |
| CN103312174B (en) * | 2012-03-15 | 2016-06-01 | 台达电子企业管理（上海）有限公司 | Converter circuit and layout thereof and controlled resonant converter circuit and layout thereof |
| US9083242B2 (en) * | 2010-12-17 | 2015-07-14 | General Electric Company | Interleaved LLC converter employing active balancing |
| CN102638167A (en) * | 2011-02-12 | 2012-08-15 | 艾默生网络能源系统北美公司 | Parallel resonant converter circuit |
| CN105790626B (en) * | 2014-12-25 | 2019-02-12 | 台达电子工业股份有限公司 | Mode of resonance circuit for power conversion and the method for controlling mode of resonance circuit for power conversion |
| CN104734520A (en) * | 2015-03-23 | 2015-06-24 | 深圳市皓文电子有限公司 | DC/DC converter |
| CN107276393B (en) * | 2017-07-25 | 2023-10-20 | 广州金升阳科技有限公司 | High-voltage power supply circuit |
| CN108365755B (en) * | 2018-03-09 | 2020-02-18 | 深圳市高斯宝电气技术有限公司 | Current-sharing adjusting method for interleaved parallel LLC circuit |
| CN111669055B (en) | 2019-03-08 | 2021-05-28 | 台达电子企业管理（上海）有限公司 | Voltage conversion circuit and control method thereof |
| WO2022021122A1 (en) * | 2020-07-29 | 2022-02-03 | 华为数字能源技术有限公司 | Transformation circuit and related electronic device |
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| CN1521930A (en) * | 2003-02-06 | 2004-08-18 | 松下电器产业株式会社 | Switch electrical source device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521930A (en) * | 2003-02-06 | 2004-08-18 | 松下电器产业株式会社 | Switch electrical source device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522896A (en) * | 2008-04-02 | 2012-06-27 | 台达电子工业股份有限公司 | Parallel resonant converter circuit and control method thereof |
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