CN201134750Y - Single-stage LLC series resonance AC/DC converter - Google Patents
Single-stage LLC series resonance AC/DC converter Download PDFInfo
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- CN201134750Y CN201134750Y CNU2007201826175U CN200720182617U CN201134750Y CN 201134750 Y CN201134750 Y CN 201134750Y CN U2007201826175 U CNU2007201826175 U CN U2007201826175U CN 200720182617 U CN200720182617 U CN 200720182617U CN 201134750 Y CN201134750 Y CN 201134750Y
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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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Abstract
The utility model relates to a single-stage LLC series resonance AC/DV converter, which comprises an input filter voltage dividing circuit (1), a rectification circuit (2), a power factor (PFC) correcting control circuit (3) and an LLC series resonance DC/DC converter (4). The single-stage LLC series resonance AC/DV converter is characterized in that the filter capacitance of the input filter voltage dividing circuit adopts two capacitances to connect in series, the capacitances not only filter, but also are used to evenly dividing input voltage, the capacitances are connected with an alternating current input end of the rectification circuit, the power factor (PFC) correcting control circuit adopts electric inductance (Lr) and the capacitance (Cr) to connect in series, one end is connected on a midpoint position of two input voltage dividing capacitances after being connected in series, and the other end is connected on the midpoint position of two reversible switches of the LLC series resonance DC/DC converter. The converter adopts a frequency control mode. The converter not only has the advantages of the LLC series resonance DC/DC converter, but also has a high power factor which is close to 1, output current satisfies the EC61000-2-3 standards, furthermore, in the range of input alternating voltage 180-265Vrms and load 10%-100%, the direct current bus voltage is lower than 450V, the converter of the utility model has good applicable prospect in the power supply fields of computer power supplies with middle and small power, flat televisions, VCDs, DVDs and the like.
Description
Technical field
The utility model relates to a kind of single-stage LLC series resonance AC/DC converter.Be specially High Power Factor AC/DC converter, belong to transformation of electrical energy and control technology field with single-stage PFC+LLC DC/DC series resonant converter.
Background technology
The disclosed half-bridge LLC of Chinese patent CN 136878A series resonance DC/DC converter (see figure 1), this converter has two resonance-characteristic frequencies: one is the resonance frequency fs that capacitor C s and Ls constitute,
Another is the resonance frequency fm that capacitor C s and Ls+Lm constitute,
Fm＜fs wherein, when the operating frequency of converter during greater than fm, this converter has the excellent properties that has the soft switch of switch tube zero voltage (ZVS), high efficiency, low EMI in full load and full input voltage range, makes this converter be highly suitable for the occasion of high efficiency, high power density.But at present when practical application, in order to improve power factor, reduce input current harmonics content, usually increase one-level power factor correction (PFC) link, the advantage of this scheme is: have high power factor and the adjusting of output voltage fast, but shortcoming is: need two cover switch and control circuits, device is many, cost is high, power consumption is big.In order to address the above problem, adopt the single-stage AC/DC converter that PFC level and DC/DC converter are integrated usually, two kinds of typical single-stage high-power rate factor LLC series resonance AC/DC converter technology are arranged at present:
One is by the single-stage AC/DC converter of the boost PFC+LLC series resonance DC/DC of Taiwan department of electrical engineering of Tsing-Hua University proposition.The problem of this converter is: because when underloading and high input voltage, DC bus-bar voltage is greater than the peaked twice of maximum input voltage, therefore the scope of the AC-input voltage effective value of this converter is that 110 ± 20%V (list of references is: Industrial Technology, 2006.ICIT 2006.IEEE International Conference on) can not satisfy the requirement that the AC-input voltage valid value range is 180～265V.
It two is the electric boost PFC+ three-level LLC series resonance AC/DC converters that propose with Computer Engineering Dept. power electronics applications research department of Canadian Queens University, though it has solved input voltage accommodation is 180～265Vrms, but the quantity of the power switch pipe that it is used is the twice of single level LLC resonance inverter, complex structure, cost is higher.(list of references is: Applied Power Electronics Conferenceand Exposition, 2006.APEC.Twenty-First Annual IEEE Volume，Issue，19-23March 2006Page(s)：6pp.-)
Summary of the invention
The purpose of this utility model provides a kind of all advantages that both had LLC series resonance DC/DC converter, have again and approach 1 High Power Factor, satisfy the input current of IEC61000-2-3 class standard, lower DC bus-bar voltage, the input voltage accommodation of broad, single-stage LLC series resonance AC/DC converter cheaply.
Single-stage LLC series resonance AC/DC converter of the present utility model is made up of input partial pressure filter circuit, power factor (PFC) correction control circuit, rectification circuit and LLC series resonance DC/DC converter.It is characterized in that the electric capacity of importing partial pressure filter circuit is formed by two capacitances in series, and power factor (PFC) correcting circuit adopts inductance and capacitor seriesing circuit, pattern with resonance realizes power factor correction, the frequency of resonance is fr, end after inductance and the capacitances in series joins with the electric capacity mid point of input partial pressure filter circuit, the other end is connected with the mid point of the inverse switch of LLC series resonance DC/DC converter, in addition, the filtering dividing potential drop electric capacity of LLC series resonance DC/DC converter is not only as the power supply electric capacity of inverter, also as the storage capacitor of power factor correction.
Control method of the present utility model is: the drive signal that puts on two switches of LLC resonant circuit is that duty ratio is constant in 50% complementary signal, the output voltage, DC bus-bar voltage and the power output that adopt the frequency that changes drive signal to regulate converter.The working range of driving signal frequency f is fmin～fs, and the span of fr is: fm＜fr＜fmin.
The beneficial effects of the utility model are: use single-level circuit to realize approaching 1 power factor correction and high efficiency Power Conversion, at input ac voltage 180～265Vrms, DC bus-bar voltage is lower than 450V in the scope of load 10%～100%, has guaranteed all advantages of LLC series resonance DC/DC converter again.The utility model is at computer power supply, panel TV and the VCD of middle low power, and field of power supplies such as DVD have a good application prospect.
Description of drawings
Fig. 1 is the circuit diagram of a known LLC series resonance DC/DC converter;
Fig. 2 is the circuit diagram of the utility model single-stage LLC series resonance AC/DC converter;
Fig. 3 is the exemplary operation waveform of the utility model single-stage LLC series resonance AC/DC converter;
Fig. 4 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 1;
Fig. 5 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 2;
Fig. 6 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 3;
Fig. 7 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 4;
Fig. 8 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 5;
Fig. 9 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 6;
Figure 10 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 7;
Figure 11 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 8;
Figure 12 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 9;
Figure 13 is the equivalent circuit diagram of the utility model single-stage LLC series resonance AC/DC converter in the stage 10;
Figure 14 is the practical application block diagram of the utility model single-stage LLC series resonance AC/DC converter in liquid crystal television power supply.
Embodiment
Figure 2 shows that the circuit diagram of single-stage LLC series resonance AC/DC converter of the present utility model.This converter comprises input partial pressure filter circuit (1), power factor (PFC) correction control circuit (2), rectification circuit (3) and LLC series resonance DC/DC converter (4).In the legend, input partial pressure filter circuit (1) is made up of the equivalent capacitance Cin of an inductance L in and two series connection, upper end, two equivalent capacitance Cin series connection backs and inductance L in, bridge rectifier (3) ac input end (x
1) tandem, two equivalent capacitance Cin series connection posterior ends exchange the input other end (x with bridge rectifier (3)
2), alternating-current voltage source N holds tandem, the front end of inductance L in links to each other with AC-input voltage source L end, two equivalent capacitance Cin are used for the high fdrequency component of filtering input current and produce two only is half voltage source of input voltage.Power factor (PFC) correction control circuit (2) is in series by inductance (Lr) and electric capacity (Cr), end after the series connection joins with the mid point of input dividing potential drop capacitor C in, the other end is connected with the source electrode of the inverse switch S1 of LLC series resonance DC/DC converter, the drain electrode of S2, with the pattern realization power factor correction of resonance.Rectification circuit (3) is connected into the bridge-type form by four diode D1, D2, D3, D4.LLC series resonance DC/DC converter (4) is made up of two equivalent filter capacitor C1, C2, inverse switch (S1, S2), resonant circuit (Cs, Ls, Lm), isolating transformer T, output rectifier and filter and frequency controller, realize high efficiency DC/DC conversion, the filtering dividing potential drop capacitor C 1 of LLC series resonance DC/DC converter, C2 be not only as the power supply electric capacity of inverter, also as the storage capacitor of power factor correction.
The concrete course of work of the utility model single-stage LLC series resonance AC/DC converter is as follows.In the analysis below, the alternating-current voltage source expression formula of converter is V
In=V
mSin (2 π f
LT), f wherein
LAnd V
mBe respectively frequency of input voltage and amplitude.Under stable situation, the DC bus-bar voltage V of LLC series resonance DC/DC converter
dGreater than input voltage amplitude V
mBe divided into 10 stages in the switch periods of converter, when input power supply positive half cycle, respectively shown in 10 equivalent electric circuits of Fig. 4～13, the corresponding work waveform as shown in Figure 3, the operation principle in 10 stages is described below respectively:
(1) stage 1:t
o～t
1(equivalent electric circuit as shown in Figure 4).At t
oMoment S1, S2 turn-offs, resonance current is and ir are to the body capacitance CS2 charging of S2, the drain-source voltage VDS2 of the S2 rising of starting from scratch, therefore, the shutoff of S2 is that no-voltage is turn-offed, simultaneously, the two-way resonance current is to the body capacitance CS1 discharge of S1, and the drain-source voltage VDS1 of S1 begins to descend, when VDS1 drops to zero, the body diode DS1 conducting of S1, resonance current ir passes through D4, two Cin, DS1 is to C1, the C2 charging is Lr, the Cr energy stored is transferred to C1, C2, Lr, the voltage Vab at Cr two ends is-Vd+Vi/2, and resonance current is charges to C1 by DS1, resonant circuit Ls, Cs is to load transfer power, and this stage finishes to zero until resonance current is.
(2) stage 2:t
1～t
2(equivalent electric circuit as shown in Figure 5).Resonance current ir partly continues to charge to C1, C2 by D4, two Cin, DS1, remainder flow through Ls, Cs, resonant circuit Ls, Cs are to the load power output, and the voltage Vab at this stage Lr, Cr two ends is-Vd+Vi/2 to equal is until resonance current ir and finish.
(3) stage 3:t
2～t
3(equivalent electric circuit as shown in Figure 6).At t
2Constantly, the conducting of S1 no-voltage, the resonance current is S1 that flows through, resonant circuit Ls, Cs are to the load power output.And resonance current ir continues to charge to C2 by Ls, Cs, D4, two Cin.The voltage Vab at this stage Lr, Cr two ends is-Vd+Vi/2.
(4) stage 4:t
3～t
4(equivalent electric circuit as shown in Figure 7).At t
3Constantly, the resonance current is S1 that still flows through, ir is reverse, with the resonance frequency of fr sinusoidal rising of starting from scratch, by D1, two Cin S1 that also flows through, in this stage, resonant circuit Lr, Cr are from the power supply absorbed power, the voltage Vab at Lr, Cr two ends is-Vi/2 that resonant circuit Ls, Cs are to the load power output.
(5) stage 5:t
4～t
5(equivalent electric circuit as shown in Figure 8).At t
4Constantly, resonance current is equals the electric current of magnetizing inductance Lm, and outlet side and resonant circuit break away from fully, and resonant circuit Ls, Cs be not to the load power output.And resonant circuit Lr, Cr be still by D1, two Cin S1 that flows through, and from the power supply absorbed power, the Vab voltage at Lr, Cr two ends still is-Vi/2.Until t
5Constantly, S1 turn-offs, and begins following half work period.
(6) stage 6:t
5～t
6(equivalent electric circuit as shown in Figure 9).At t
5Constantly, S1 turn-offs, because resonance current is, ir can not suddenly change, begin body capacitance CS1 charging to S1, body capacitance CS2 discharge to S2, the drain-source voltage VDS2 of S2 begins to descend, when VDS2 drops to zero, the body diode DS2 conducting of S2, resonance current ir to C1, C2 charging, is transferred to C1, C2 to Lr, Cr energy stored by D1, DS2, two Cin, the voltage Vab at Lr, Cr two ends is Vd-Vi/2, and resonance current is charges to C2 by DS2, and resonant circuit Ls, Cs are to load transfer power, and this stage finishes to zero until resonance current is.
(7) stage 7:t
6～t
7(equivalent electric circuit as shown in figure 10).Resonance current ir partly continues to charge to C1, C2 by D1, DS2, two Cin, remainder flow through Ls, Cs, resonant circuit Ls, Cs are to the load power output, and the voltage Vab at this stage Lr, Cr two ends still is Vd-Vi/2, equal is until resonance current ir and finish.
(8) stage 8:t
7～t
8(equivalent electric circuit as shown in figure 11).At t
7Constantly, the conducting of S2 no-voltage, C2 is to resonant circuit Ls, Cs discharge, the resonance current is S2 that flows through, resonant circuit Ls, Cs are to the load power output.And resonance current ir continues the charging to C2 by Ls, Cs, D1, two Cin, and the voltage Vab at Lr, Cr two ends still is Vd-Vi/2, and this pattern finishes to zero until resonance current ir.
(9) stage 9:t
8～t
9(equivalent electric circuit as shown in figure 12).At t
8Constantly, the resonance current is S2 that still flows through, ir is reverse, and by D4, two Cin S2 that also flows through, in this stage, resonant circuit Lr, Cr are from the power supply absorbed power, and the voltage Vab at Lr, Cr two ends is Vi/2, and resonant circuit Ls, Cs are to the load power output.
(10) stage 10:t
9～t
10(equivalent electric circuit as shown in figure 13).At t
9Constantly, resonance current is equals the electric current of magnetizing inductance Lm, and outlet side and resonant circuit break away from fully, and resonant circuit Ls, Cs be not to the load power output.And resonant circuit Lr, Cr be still by D4, two Vi/2 S2 that flows through, and from the power supply absorbed power, the voltage Vab at Lr, Cr two ends still is Vi/2.Until t
10Constantly, S2 turn-offs.
From the analysis of above 10 working stages, switch S 1, S2 are operated in the ZVS state; The voltage Vab excursion that is added to resonant circuit Lr, Cr between Vd-|Vin|, thereby a switch periods resonance current ir mean value depend on Vin; In all stages, no matter the direction of resonance current ir how, always there is the ir/2 resonance current to flow out from power supply Vin, therefore, has realized input current i
InFollow input voltage and same-phase, i
InExpression formula as follows:
The utility model practical application block diagram such as Figure 14 in liquid crystal television power supply, input voltage is 180Vac～265Vac, output dc voltage is: 30V/1A; 24V/6A; 12V/3A.Circuit major parameter such as table 1
Table 1 circuit major parameter
| Element | Numerical value |
| Lin | 1mH |
| Cin | 2uF |
| Lr | 113uH |
| Cr | 66nF |
| Ls | 113uH |
| Cs | 22nF |
| Lm | 818uH |
| S1、S2 | IRFP450 |
Claims (4)
1. single-stage LLC series resonance AC/DC converter comprises: input partial pressure filter circuit (1), power factor (PFC) correction control circuit (2), rectification circuit (3) and LLC series resonance DC/DC converter (4);
-input partial pressure filter circuit (1) is made up of the equivalent capacitance Cin of an inductance L in and two series connection, two upper ends, equivalent capacitance Cin series connection back and inductance L in, bridge rectifier (3) ac input end (x
1) tandem, two equivalent capacitance Cin series connection posterior ends exchange the input other end (x with bridge rectifier (3)
2), alternating-current voltage source N holds tandem, the front end of inductance L in links to each other with AC-input voltage source L end, two equivalent capacitance Cin are used for the high fdrequency component of filtering input current and produce two is half voltage source of input voltage;
-power factor (PFC) correcting circuit (2) comprising: proofread and correct inductance (Lr), a corrective capacity (Cr) for one, both are connected in series, end after the series connection joins with the mid point of input dividing potential drop electric capacity, and the other end after the series connection is connected with the source electrode of the inverse switch S1 of LLC series resonance DC/DC converter;
-rectification circuit (3) is made up of four diodes, is used for input voltage is rectified into the direct current of pulsation;
-LLC series resonance DC/DC converter (4) comprising: two equivalent bus filter capacitor C1, C2, inverse switch (S1, S2), resonant circuit (Cs, Ls, Lm), isolating transformer T, output rectifier and filter and frequency controllers.
2. single-stage LLC series resonance AC/DC converter according to claim 1, it is characterized in that the resonance frequency that described capacitor C r and inductance L r constitute is fr, the resonance frequency that capacitor C s and inductance L s constitute is fs, and the resonance frequency that capacitor C s and Ls and Lm constitute is fm, wherein fm＜fs.
3. single-stage LLC series resonance AC/DC converter according to claim 1 is characterized in that the working range of frequency f is fmin～fs by the FREQUENCY CONTROL power output of control inverse switch (S1, S2).
4. single-stage LLC series resonance AC/DC converter according to claim 1, the scope of fr is: fm＜fr＜fmin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201826175U CN201134750Y (en) | 2007-10-08 | 2007-10-08 | Single-stage LLC series resonance AC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201826175U CN201134750Y (en) | 2007-10-08 | 2007-10-08 | Single-stage LLC series resonance AC/DC converter |
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| Publication Number | Publication Date |
|---|---|
| CN201134750Y true CN201134750Y (en) | 2008-10-15 |
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ID=40063020
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|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841244A (en) * | 2009-03-20 | 2010-09-22 | 力博特公司 | Low output loss LLC resonant converter |
| CN101958649A (en) * | 2010-07-30 | 2011-01-26 | 中国科学技术大学 | Resonant-type stabilized current supply device |
| CN102025266A (en) * | 2009-06-18 | 2011-04-20 | 力博特公司 | Numeric control method for liquid level control (LLC) resonant conversion circuit |
| CN102130515A (en) * | 2011-04-08 | 2011-07-20 | 东南大学 | Non-contact electrical energy transmission device with self-adaptive power factor correction and control method |
| CN103280964A (en) * | 2013-05-27 | 2013-09-04 | 奇瑞汽车股份有限公司 | Power factor correction circuit |
| CN104040860A (en) * | 2011-11-17 | 2014-09-10 | 通用电气公司 | LED Power Source With Over-voltage Protection |
| CN104779820A (en) * | 2015-04-16 | 2015-07-15 | 陕西科技大学 | Single-stage AC-DC resonant converter |
| CN105790586A (en) * | 2014-12-23 | 2016-07-20 | 台达电子工业股份有限公司 | Power supply system, uninterruptable power system and power supply method |
| CN106533204A (en) * | 2016-10-19 | 2017-03-22 | 南京博兰得电子科技有限公司 | Resonant AC/DC conversion device and control method thereof |
| CN106787675A (en) * | 2016-12-28 | 2017-05-31 | 成都芯源系统有限公司 | Resonant converter with power factor correction function and controller thereof |
| CN108604861A (en) * | 2016-02-12 | 2018-09-28 | 飞利浦照明控股有限公司 | DC/DC resonance converters and the PFC using resonance converter and corresponding control method |
| CN109831097A (en) * | 2019-02-25 | 2019-05-31 | 洛阳隆盛科技有限责任公司 | A kind of voltage-dropping power supply circuit and method based on the conversion of two-stage cascade voltage |
| CN110071640A (en) * | 2019-04-01 | 2019-07-30 | 三峡大学 | A kind of three times stream rectification LLC three phase full bridge DC converter |
| CN111555604A (en) * | 2020-04-10 | 2020-08-18 | 杭州电子科技大学 | Novel quasi-single-stage high power factor circuit |
| CN112054699A (en) * | 2020-09-16 | 2020-12-08 | 南通大学 | Integrated PCB (printed circuit board) level meltblown electret power supply topology |
| CN115473442A (en) * | 2022-11-15 | 2022-12-13 | 四川大学 | Numerical analysis modeling and boundary power control method for LLC single-stage AC-DC converter |
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| CN102025266B (en) * | 2009-06-18 | 2013-11-20 | 力博特公司 | Numeric control method for liquid level control (LLC) resonant conversion circuit |
| CN102025266A (en) * | 2009-06-18 | 2011-04-20 | 力博特公司 | Numeric control method for liquid level control (LLC) resonant conversion circuit |
| CN101958649A (en) * | 2010-07-30 | 2011-01-26 | 中国科学技术大学 | Resonant-type stabilized current supply device |
| CN102130515A (en) * | 2011-04-08 | 2011-07-20 | 东南大学 | Non-contact electrical energy transmission device with self-adaptive power factor correction and control method |
| CN104040860B (en) * | 2011-11-17 | 2017-02-22 | 通用电气公司 | Led power source with over-voltage protection |
| CN104040860A (en) * | 2011-11-17 | 2014-09-10 | 通用电气公司 | LED Power Source With Over-voltage Protection |
| CN103280964B (en) * | 2013-05-27 | 2015-10-28 | 奇瑞汽车股份有限公司 | A kind of circuit of power factor correction |
| CN103280964A (en) * | 2013-05-27 | 2013-09-04 | 奇瑞汽车股份有限公司 | Power factor correction circuit |
| US10056780B2 (en) | 2014-12-23 | 2018-08-21 | Delta Electronics, Inc. | Power supply system, uninterruptible power supply system, and power supply method |
| CN105790586A (en) * | 2014-12-23 | 2016-07-20 | 台达电子工业股份有限公司 | Power supply system, uninterruptable power system and power supply method |
| CN105790586B (en) * | 2014-12-23 | 2019-02-12 | 台达电子工业股份有限公司 | Power supply system, uninterrupted power system and method for supplying power to |
| CN104779820A (en) * | 2015-04-16 | 2015-07-15 | 陕西科技大学 | Single-stage AC-DC resonant converter |
| CN108604861A (en) * | 2016-02-12 | 2018-09-28 | 飞利浦照明控股有限公司 | DC/DC resonance converters and the PFC using resonance converter and corresponding control method |
| CN106533204A (en) * | 2016-10-19 | 2017-03-22 | 南京博兰得电子科技有限公司 | Resonant AC/DC conversion device and control method thereof |
| CN106787675A (en) * | 2016-12-28 | 2017-05-31 | 成都芯源系统有限公司 | Resonant converter with power factor correction function and controller thereof |
| CN106787675B (en) * | 2016-12-28 | 2019-04-23 | 成都芯源系统有限公司 | Resonant converter with power factor correction function and controller thereof |
| CN109831097A (en) * | 2019-02-25 | 2019-05-31 | 洛阳隆盛科技有限责任公司 | A kind of voltage-dropping power supply circuit and method based on the conversion of two-stage cascade voltage |
| CN110071640A (en) * | 2019-04-01 | 2019-07-30 | 三峡大学 | A kind of three times stream rectification LLC three phase full bridge DC converter |
| CN111555604A (en) * | 2020-04-10 | 2020-08-18 | 杭州电子科技大学 | Novel quasi-single-stage high power factor circuit |
| CN112054699A (en) * | 2020-09-16 | 2020-12-08 | 南通大学 | Integrated PCB (printed circuit board) level meltblown electret power supply topology |
| CN115473442A (en) * | 2022-11-15 | 2022-12-13 | 四川大学 | Numerical analysis modeling and boundary power control method for LLC single-stage AC-DC converter |
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