CN114070088A - Resonance push-pull direct current transformer - Google Patents
Resonance push-pull direct current transformer Download PDFInfo
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- CN114070088A CN114070088A CN202111364223.2A CN202111364223A CN114070088A CN 114070088 A CN114070088 A CN 114070088A CN 202111364223 A CN202111364223 A CN 202111364223A CN 114070088 A CN114070088 A CN 114070088A
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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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
- H02M3/337—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 in push-pull configuration
- H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
- H02M3/3378—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 in push-pull configuration with automatic control of output voltage or current in a push-pull configuration of the parallel type
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a resonance push-pull direct-current transformer which comprises a transformer, wherein the transformer comprises a first primary winding, a second primary winding, a first secondary winding and a second secondary winding, the first primary winding is connected with a first switch in series and then connected with an input voltage in parallel, the first switch is connected with a first capacitor in parallel, the second primary winding is connected with a second switch in series and then connected with the input voltage in parallel, the second switch is connected with a second capacitor in parallel, the first secondary winding is connected with a first inductor and a third switch in series and then connected with a third capacitor in parallel, and the second secondary winding is connected with a second inductor and a fourth switch in series and then connected with a third capacitor in parallel. The windings are connected in parallel in a staggered mode, so that the output power can be doubled, and the reduction of voltage ripples is facilitated.
Description
Technical Field
The present invention relates to power electronic transformers, and more particularly to dc transformers.
Background
Fig. 1 shows a resonant forward DC Transformer (DC Transformer, DCX) in the prior art, where Vin is an input voltage, Cstr is a parasitic capacitance of the Transformer, Lm is an excitation inductance of the Transformer, Lk is a leakage inductance converted to a secondary side, Crp and Crs are parasitic capacitances of an original secondary side, Lo is an output filter inductance, Co is an output filter capacitance, and R is a load.
In steady state operation, one switching cycle can be divided into two operating modes, as shown in fig. 2: t0-t1 are in a mode one, at the moment, the switching tube Q1 is turned on, the secondary side Lk and the Crs form a resonant cavity, the current is changes in resonance, and zero current turn-off is realized at the moment of t 1; t1-t2 are mode II, at the moment, the switching tube Q1 is turned off, the primary side and the secondary side are approximately decoupled, Lm and the primary side resonant capacitor Crp form a resonant cavity, voltage at two ends of the switching tube Q1 is subjected to resonant transformation, and zero voltage turning-on is achieved at the moment of t 2. In order to realize primary side resonance of the transformer, a resonant capacitor Crp is arranged at two ends of the switching tube Q1, and the voltage stress of the switching tube Q1 mainly comes from excitation energy in the transformer T. In the resonance process, the current of the exciting inductor is reduced, the resonance voltage is increased, the exciting energy is gradually transferred to the resonance capacitor Crp to generate high voltage stress, and particularly, in the high frequency, the resonance capacitor Crp is small, and the problem of the voltage stress is more prominent. The switching tube Q1 bears a large switching stress during the second mode, which limits the increase of the duty cycle of the circuit and is not favorable for the improvement of power and efficiency. In practical application, the rated withstand voltage of the device is required to be at least more than 4 times of the input voltage, and the cost reduction and the type selection of the device are difficult.
Disclosure of Invention
The invention is based on the consideration that a pair of parallel windings are added on the basis of single-stage resonance forward excitation DCX of the resonance push-pull direct current transformer and are integrated on the same transformer magnetic core, so that Zero Voltage Zero Current Switch (ZVZCS) can be realized, and voltage clamping can be realized by utilizing coupling among the windings. Because the windings are connected in parallel in a staggered mode, the output power can be doubled, and voltage ripples can be reduced.
The invention discloses a resonance push-pull direct-current transformer which comprises a transformer, wherein the transformer comprises a first primary winding, a second primary winding, a first secondary winding and a second secondary winding, the first primary winding is connected with a first switch in series and then connected with an input voltage in parallel, the first switch is connected with a first capacitor in parallel, the second primary winding is connected with a second switch in series and then connected with the input voltage in parallel, the second switch is connected with a second capacitor in parallel, the first secondary winding is connected with a first inductor and a third switch in series and then connected with a third capacitor in parallel, and the second secondary winding is connected with a second inductor and a fourth switch in series and then connected with a third capacitor in parallel.
The resonant push-pull direct-current transformer further comprises a third inductor, and the third inductor is connected with the first primary winding in parallel.
The resonant push-pull direct-current transformer further comprises a fourth inductor, and the fourth inductor is connected with the second primary winding in parallel.
The third inductor is an excitation inductor of the first primary winding, and the fourth inductor is an excitation inductor of the second primary winding.
The input voltage transfers electric energy to the first secondary winding through the first primary winding.
The input voltage transfers electric energy to the second secondary winding through the second primary winding.
The ratio of the number of turns of the first primary winding to the number of turns of the second primary winding is 1: 1.
The first inductor is a leakage inductance converted from the first primary winding to the secondary side, and the second inductor is a leakage inductance converted from the second primary winding to the secondary side.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 shows a resonant forward dc transformer in the prior art.
Fig. 2 is a waveform diagram of key signals in fig. 1.
Fig. 3 is a structural diagram of a first embodiment of a resonant push-pull dc transformer according to the present invention.
Fig. 4 is a structural diagram of a second embodiment of a resonant push-pull dc transformer according to the present invention. .
Fig. 5 is a waveform diagram of key signals in the resonant push-pull dc transformer of the present invention.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Fig. 3 shows a first embodiment of the present invention, where Vin is the input voltage and Vo is the output voltage. The resonant push-pull dc transformer comprises a transformer T1, the transformer T1 comprising a primary winding N11 and a primary winding N12 and a secondary winding N21 and a secondary winding N22.
The primary winding N11 is connected in series with a switch Q11 and then connected in parallel with an input voltage Vin, two ends of the switch Q11 are connected in parallel with a capacitor Crp1, and the capacitor Crp1 and an inductor Lm1 are in series resonance.
The primary winding N12 is connected in series with a switch Q21 and then connected in parallel with an input voltage Vin, two ends of the switch Q21 are connected in parallel with a capacitor Crp2, and the capacitor Crp2 and an inductor Lm2 are in series resonance. The same-name ends of the primary windings N11 and N21 are opposite.
The secondary winding N12 is connected with an inductor Lk1 in series, a switch Q12 in series and a capacitor Crs in series, and the capacitor Crs is connected with the filter module in parallel and then outputs an output voltage Vo. The same-name ends of the primary windings N11 and N12 are the same.
The secondary winding N22 is connected with an inductor Lk2 in series, a switch Q22 in series and a capacitor Crs in series, and the capacitor Crs is connected with the filter module in parallel and then outputs an output voltage Vo. The same-name ends of the primary windings N21 and N22 are the same.
In an embodiment of the present invention, the inductance Lk1 is a sum of leakage inductance of the N11 winding after being converted to the secondary side and leakage inductance of the N12 winding, and the inductances Lk2 are respectively Lk2 which are sums of leakage inductance of the N21 winding after being converted to the secondary side and leakage inductance of the N22 winding. The inductor Lm1 is the excitation inductance of the primary winding N11, and the inductor Lm2 is the excitation inductance of the primary winding N21.
The filtering module comprises an inductor Lo and a capacitor Co, wherein the inductor Lo and the capacitor Co are connected in series. Two ends of the capacitor Co are output ends.
The number of turns for winding N11 and winding N21 is 1: 1. Since the turn ratios of the two windings are the same and are on the same core, generally, the leakage inductances Lk1 and Lk2 are the same, and in this case, the switches Q12 and Q22 are respectively turned on for the same time, i.e., the resonant periods are the same. If Lk1 is different from Lk2 due to different coil windings or different distances from the air gap, the on-time of the switches Q12 and Q22 is adjusted, so that the switch-on is longer when the resonant period is long, and the switch-on is shorter when the resonant period is short, thereby ensuring zero current switch-off.
The circuit shown in fig. 3 has the following operation modes, please refer to fig. 5 again. Where Vgs1 Is the drive signal for switches Q11 and Q12, Vgs2 Is the drive signal for switches Q21 and Q22, Iin Is the input current, Is1 Is the current in winding N12, and Is2 Is the current in winding N22.
Modality 1(t0-t 1): switches Q11 and Q12 are turned on, the input voltage Vin transfers energy to the capacitor Co through the winding N11 and the winding N12, the inductor Lk1 and the capacitor Crs resonate, and Is1 resonates to 0 at time t1, so that zero current turn-off (ZCS) of Q12 Is realized. During this process the voltage across winding N11 is Vin, the voltage across winding N21 is clamped, and the voltage across Q21 is2 Vin.
Modality 2(t1-t 2): all the switch tubes are turned off, the primary side and the secondary side are approximately decoupled, and the inductor Lm1+ Lm2 resonates with the capacitor Crp1 and the capacitor Crp 2. The voltage across switch Q11 resonates up, the voltage across switch Q21 drops, and switch Q21 turns on at Zero Voltage (ZVS) at time t 2.
Modality 3(t2-t 3): the switches Q21 and Q22 are switched on, the current in the winding N21 Is in zero-crossing reverse direction, after the magnetic reset Is completed, the input voltage Vin transmits energy to the capacitor Co through the winding N21 and the winding N22, the inductor Lk2 and the capacitor Crs resonate, the inductor Is2 resonates to 0 at the time of t3, and the zero-current turn-off (ZCS) of the switch Q22 Is realized. In the process, the voltage across the winding N21 is Vin, the voltage across the winding N11 is clamped, and the voltage across the switch Q11 is2 Vin. The magnetic core is magnetized in two directions, thereby improving the utilization rate of the magnetic core
Modality 4(t3-t 4): similar to mode 2, but with the current flow reversed, the primary and secondary sides are approximately decoupled, and the inductor Lm1+ Lm2 resonates with a capacitor Crp1 and a capacitor Crp 2. The voltage across switch Q21 resonates up, the voltage across switch Q11 drops, and switch Q11 turns on at Zero Voltage (ZVS) at time t 4.
The three resonant capacitors Crp1, Crp2 and Crs respectively resonate with the exciting inductance and the leakage inductance of the transformer T1 to realize the original secondary full soft switch, and the working mode is simple and the required devices are fewer. Because the original secondary side full soft switch is realized, the working frequency can be greatly improved, the volume of the energy storage element is favorably reduced, and the power density is further improved. When the high-frequency resonance occurs, the voltage ripples at the two ends of the capacitor Crs are small, so that the size of the output filter is reduced.
In the prior art, fig. 1 shows that a single tube is positively excited, and secondary side only generates primary resonance in one working period. When the output power, the frequency and the duty ratio are the same, the capacitor Crs can be smaller in capacitance value without increasing voltage ripple; under the condition that the values of the capacitors Crs are the same, the invention can output larger power. Meanwhile, the secondary side resonance can realize zero current turn-off of the synchronous rectifier tube, reduce the switching loss and improve the frequency and the power density.
Fig. 4 shows another embodiment of the present invention, which differs from the embodiment shown in fig. 3 in that the primary and secondary windings incorporate common terminal taps, and only three terminals are required for each primary and secondary.
According to the technical scheme, the magnetic core is magnetized in two directions, and the utilization rate of the magnetic core can be improved. The voltage across the switching devices Q11, Q21 is clamped and both switching devices participate in the main power transfer. The voltage clamping, magnetic resetting and resonant soft switching can be realized without additional auxiliary circuits. The other two coils are connected in parallel in a staggered mode, so that one time of output power can be increased, the frequency and the duty ratio can be fixed, the working point can be operated at the optimal working point, and the control is simple.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A resonance push-pull direct current transformer is characterized by comprising a transformer, wherein the transformer comprises a first primary winding, a second primary winding, a first secondary winding and a second secondary winding, the first primary winding is connected with a first switch in series and then connected with an input voltage in parallel, the first switch is connected with a first capacitor in parallel, the second primary winding is connected with a second switch in series and then connected with the input voltage in parallel, the second switch is connected with a second capacitor in parallel, the first secondary winding is connected with a first inductor and a third switch in series and then connected with a third capacitor in parallel, and the second secondary winding is connected with a second inductor and a fourth switch in series and then connected with a third capacitor in parallel.
2. A resonant push-pull dc transformer as claimed in claim 1, further comprising a third inductor, said third inductor being connected in parallel with the first primary winding.
3. A resonant push-pull dc transformer as claimed in claim 2, further comprising a fourth inductor, said fourth inductor being connected in parallel with the second primary winding.
4. A resonant push-pull dc transformer as claimed in claim 3, wherein the third inductance is the excitation inductance of the first primary winding and the fourth inductance is the excitation inductance of the second primary winding.
5. A resonant push-pull dc transformer as claimed in claim 1, wherein the input voltage delivers power to the first secondary winding via the first primary winding.
6. A resonant push-pull DC transformer according to claim 5, characterized in that the input voltage delivers electrical energy via the second primary winding to the second secondary winding.
7. A resonant push-pull dc transformer as claimed in claim 1, wherein the first primary winding and the second primary winding have a 1:1 turns ratio.
8. The resonant push-pull dc transformer of claim 7, wherein the first inductance is the sum of the leakage inductance of the first primary winding after being converted to the secondary side and the leakage inductance of the first secondary winding, and the second inductance is the sum of the leakage inductance of the second primary winding after being converted to the secondary side and the leakage inductance of the second secondary winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364223.2A CN114070088B (en) | 2021-11-17 | 2021-11-17 | Resonant push-pull direct-current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364223.2A CN114070088B (en) | 2021-11-17 | 2021-11-17 | Resonant push-pull direct-current transformer |
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| Publication Number | Publication Date |
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| CN114070088A true CN114070088A (en) | 2022-02-18 |
| CN114070088B CN114070088B (en) | 2024-01-19 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788634A (en) * | 1987-06-22 | 1988-11-29 | Massachusetts Institute Of Technology | Resonant forward converter |
| CN1333593A (en) * | 2000-07-11 | 2002-01-30 | 索尼株式会社 | Switch power source capable of improving power factor by voltage feedback |
| CN202750015U (en) * | 2012-05-31 | 2013-02-20 | 苏州爱能普电气有限公司 | High-efficient low-cost push-pull-type direct current converter |
| CN103944402A (en) * | 2014-04-15 | 2014-07-23 | 广州金升阳科技有限公司 | Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter |
| CN105245113A (en) * | 2015-10-29 | 2016-01-13 | 燕山大学 | Anti-conduction-through soft switch push-pull LLC resonance converter |
| WO2018077230A1 (en) * | 2016-10-27 | 2018-05-03 | 深圳市优优绿能电气有限公司 | Llc resonant converter having high-voltage output |
| CN109450263A (en) * | 2018-10-29 | 2019-03-08 | 南京航空航天大学 | One kind recommending mode of resonance driving circuit and its control method |
-
2021
- 2021-11-17 CN CN202111364223.2A patent/CN114070088B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788634A (en) * | 1987-06-22 | 1988-11-29 | Massachusetts Institute Of Technology | Resonant forward converter |
| CN1333593A (en) * | 2000-07-11 | 2002-01-30 | 索尼株式会社 | Switch power source capable of improving power factor by voltage feedback |
| CN202750015U (en) * | 2012-05-31 | 2013-02-20 | 苏州爱能普电气有限公司 | High-efficient low-cost push-pull-type direct current converter |
| CN103944402A (en) * | 2014-04-15 | 2014-07-23 | 广州金升阳科技有限公司 | Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter |
| CN105245113A (en) * | 2015-10-29 | 2016-01-13 | 燕山大学 | Anti-conduction-through soft switch push-pull LLC resonance converter |
| WO2018077230A1 (en) * | 2016-10-27 | 2018-05-03 | 深圳市优优绿能电气有限公司 | Llc resonant converter having high-voltage output |
| CN109450263A (en) * | 2018-10-29 | 2019-03-08 | 南京航空航天大学 | One kind recommending mode of resonance driving circuit and its control method |
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| CN114070088B (en) | 2024-01-19 |
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