CN101645653A - LLC resonance circuit - Google Patents
LLC resonance circuit Download PDFInfo
- Publication number
- CN101645653A CN101645653A CN200810142234A CN200810142234A CN101645653A CN 101645653 A CN101645653 A CN 101645653A CN 200810142234 A CN200810142234 A CN 200810142234A CN 200810142234 A CN200810142234 A CN 200810142234A CN 101645653 A CN101645653 A CN 101645653A
- Authority
- CN
- China
- Prior art keywords
- transformer
- circuit
- power supply
- load
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention is suitable for the technical field of power supply, and provides an LLC resonance circuit, which comprises a drive circuit, a half-bridge circuit and a resonant capacitor. The LLC circuit also comprises two or more transformers; primary windings of the transformers are connected in series, while secondary main windings are connected in parallel and then connected with a rectification filter circuit; and the output of the secondary main windings is rectified and filtered and then provides the power supply for main load. The technical scheme provided by the invention solves the problem that the power supply is instable in the prior art, which is caused in a state that auxiliary windings of the transformers are loaded prior to the primary windings; when output power is great, the transformers share transmission power; when the number of output level is great, each transformer can additionally carry a path of load with different level, so that load carrying is not limited bythe number of pins of a single transformer any longer; and the LLC resonance circuit overcomes the defect that an additional low-voltage DC-DC conversion circuit is needed to meet a plurality of paths of different output level when two transformers of two or more transformers are connected in series with a single path of output level in the prior art.
Description
Technical field
The invention belongs to LLC circuit engineering field, relate in particular to a kind of LLC circuit of multiple transformers.
Background technology
LCD (liquid crystal) the TV power scope of application is generally 100Vac to 240Vac, general its power supply is divided into APFC (active power factor circuit passive power factor corrective) and DC_DC two parts, the APFC circuit is that VB (about general+390V) galvanic current is pressed with the filtered boost in voltage of AC rectification, when finishing the AC-DC conversion, finish power factor emendation function; DC_DC is the high frequency conversion process by DC-AD-DC partly, and VB is transformed to the voltage of the required varying level of LCD TV, and the LLC resonant circuit be a kind of efficient DC_DC power supply topologies of new rise in recent years.
Seeing also Fig. 1, is the circuit diagram of existing a kind of multiple transformers LLC circuit, and this circuit comprises drive circuit IC1DRIVE, the half-bridge circuit that high-voltage MOS pipe Q11 and high-voltage MOS pipe Q12 constitute, transformer T11 and transformer T12, resonant capacitance Cr11, diode D11A, diode D11B, diode D12 and diode D13, filter capacitor C11, filter capacitor C12, filter capacitor C13, load RL11, load RL12, load RL13.
High-voltage MOS pipe Q11 and high-voltage MOS pipe Q12 are as the switching tube of inverter, and the formation half-bridge circuit, and this drive circuit IC1DRIVE drives the half-bridge circuit of high-voltage MOS pipe Q11 and high-voltage MOS pipe Q12 formation, and VB is converted to square-wave voltage with direct voltage;
Transformer T11 is identical with transformer T12 primary turns, and the secondary main winding number of turn is identical, and its elementary windings in series is to the mid point of the half-bridge circuit of high pressure metal-oxide-semiconductor Q11 and high-voltage MOS pipe Q12 formation, through resonant capacitance Cr11 ground connection; In addition, transformer T11 and transformer T12 have elementary winding leakage inductance Lr (figure does not show) and magnetizing inductance Lm (figure does not show), and this elementary winding leakage inductance Lr, magnetizing inductance Lm and resonant capacitance Cr11 form first resonance frequency; Elementary winding leakage inductance Lr and resonant capacitance Cr11 form second resonance frequency; Drive circuit IC1DRIVE makes circuit working between first resonance frequency to the second resonance frequency, and high-voltage MOS pipe Q11 and high-voltage MOS pipe Q12 can realize that no-voltage opens (ZVS);
The secondary main winding of transformer T11 and transformer T12 is in parallel after diode D11A, each self-rectifying of diode D11B, connects main load RL11 through filter capacitor C11.Connect heavily loaded state earlier at its main load RL11, auxiliary winding is respectively through diode D12 and diode D13 rectification, and capacitor C 12, capacitor C 13 filtering can provide energy respectively to load RL12, load RL13; And do not add heavily loaded state earlier at its main load RL11, and other auxiliary windings carry out necessary feedback as adding heavier load (for example RL12) earlier as not adding circuit in addition, and main load terminal voltage will raise, and circuit can't keep steady operation.Power up earlier and LCD complete machine powering sequential generally is host CPU, signal plate, screen drive circuit, treat that signal processing is good after, again with backlight lightening, avoid occurring the phenomenon of image confusion, like this, will cause the instability of circuit.
, high efficiency direction ultra-thin along with LCD tv product trend develops, and its built-in system requires more and more higher to the height of the stabilizing output level grade of power supply, power supply, efficient etc.And the multiple voltage demand arranged generally; for example: backlight required+24V, signal processing is required+12V, audio power amplifier is required+18V or 12V; small-signal, CPU be required+6V or+5V or+5VSTB etc., the DC_DC power supply output that can cause above-mentioned LLC resonant circuit to constitute usually is unstable.
Summary of the invention
The object of the present invention is to provide a kind of LLC resonant circuit, be intended to solve the DC_DC power supply output problem of unstable of the LLC resonant circuit formation that exists in the prior art.
The present invention realizes like this, a kind of LLC resonant circuit, comprise drive circuit, half-bridge circuit and resonant capacitance, described LLC circuit also comprises two or more transformer, the elementary windings in series of described transformer, connect current rectifying and wave filtering circuit after the secondary main winding parallel connection, the output of described secondary main winding provides power supply for main load behind rectifying and wave-filtering.
Described LLC circuit comprises transformer (T1) and transformer (T2), described transformer (T1) and the positive and negative phase pin of the secondary main winding of transformer (T2) are connected the positive pole of diode (D1A) diode (D1B) respectively, and the negative pole of diode (D1A) and diode (D1B) links to each other with the positive voltage terminal of the positive pole of electric capacity (C1), main load (RL1).
Described transformer also comprises the secondary auxiliary winding that two or more are different, and different voltages are exported in the output of described secondary auxiliary winding behind rectifying and wave-filtering.
Described transformer (T1) also comprises secondary auxiliary winding, and the output of described secondary auxiliary winding provides power supply for assistant load (RL3) after diode (D3) rectification, electric capacity (C3) filtering.
Described assistant load (RL3) is the audio power amplifier power supply.
Described transformer (T2) also comprises secondary auxiliary winding, and the output of described secondary auxiliary winding provides power supply for assistant load (RL2) after diode (D2) rectification, electric capacity (C2) filtering.
Described assistant load (RL2) is the signal processing power supply.
Described two or more primary umber of turn is identical, and the secondary main winding number of turn is identical and phase place is identical.
Described main load is the LCD TV backlight power supply.
Described half-bridge circuit comprises high-voltage MOS pipe (Q1) and high-voltage MOS pipe (Q2), and described primary windings in series is to the mid point of the half-bridge circuit of high pressure metal-oxide-semiconductor (Q1) and high-voltage MOS pipe (Q2) formation, through described resonant capacitance ground connection.
The present invention overcomes the deficiencies in the prior art, the LLC resonant power DC-DC circuit that adopts at least two transformers to constitute, and rectifying and wave-filtering again after the secondary main winding of each transformer is directly in parallel, overcome in the prior art the auxiliary winding of transformer prior to the power supply problem of unstable of main winding stress state following generation, when power output is big, each transformer is shared through-put power, no longer is subjected to the limitation in height of single transformer; More for a long time, each transformer all can no longer be subjected to the number of pins quantitative limitation of single transformer in addition with the load of one road varying level at output level; Overcome two or more two transformers series connection single channel output level in the prior art, need add low voltage DC-DC change-over circuit in addition and satisfy the shortcoming of the different output level of multichannel.
Description of drawings
Fig. 1 is existing LLC resonant circuit circuit diagram;
The circuit diagram of the LLC resonant circuit that Fig. 2 embodiment of the invention provides.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Seeing also Fig. 2, is many output levels of multiple transformers LLC circuit diagram that the embodiment of the invention provides.This circuit comprises transformer T1 and transformer T2, main load RL1, drive circuit IC2DRIVE, high-voltage MOS pipe Q1 and high-voltage MOS pipe Q2, resonant capacitance Cr, diode D2 and diode D3, filter capacitor C2 and filter capacitor C3, assistant load RL2 and assistant load RL3.
Transformer T1 and transformer T2 comprise an elementary winding respectively, a secondary main winding and a secondary auxiliary winding, and transformer T1 is identical with the elementary umber of turn of transformer T2, and the secondary main winding number of turn is identical, phase place is identical.The elementary windings in series of transformer T1 and transformer T2 is connected, and the secondary main winding of transformer is directly in parallel.High-voltage MOS pipe Q1 and high-voltage MOS pipe Q2 constitute half-bridge circuit.Circuit functions such as the voltage sampling by Feedback (feedback) part, error voltage comparison, error voltage amplification, feedback, the drive signal of approximate 0.5 duty ratio of drive circuit IC2DRIVE output variable frequency (wherein comprises Dead Time, prevent that the straight-through state of half-bridge circuit from occurring), through the half-bridge circuit power switch of high-voltage MOS pipe Q1 and high-voltage MOS pipe Q2 formation, VB is converted to square-wave voltage with direct voltage.Transformer T1, transformer T2 have the elementary winding leakage inductance Lr and the magnetizing inductance Lm of equivalence, elementary winding leakage inductance Lr, magnetizing inductance Lm and resonant capacitance Cr composition LC resonant circuit, resonance in first resonance frequency (
N is the quantity of institute's series transformer); Leakage inductance Lr and resonant capacitance Cr form the LC resonant circuit, resonance in second resonance frequency (
N is the quantity of institute's series transformer); The signal frequency of drive circuit IC2 DRIVE output is between first resonance frequency to the second resonance frequency, and high-voltage MOS pipe Q1 and high-voltage MOS pipe Q2 can realize that no-voltage opens (ZVS).
The synchronous pin of secondary main winding (the using Copper Foil) UNICOM of transformer T1 and transformer T2, centre cap pin (using Copper Foil) and secondary ground wire UNICOM, transformer T1 and the positive and negative phase pin of the secondary main winding of transformer T2 are connected the positive pole of diode D1A, diode D1B respectively, and the negative pole of diode D1A and diode D1B links to each other with the positive pole of capacitor C 1, the positive voltage terminal of main load RL1; The connected mode of the secondary auxiliary winding of transformer T1 and transformer T2 and secondary main winding basic identical, difference are that secondary auxiliary winding is independent separately, do not link to each other with other windings; After T2 level of transformer T1 and transformer main winding was in parallel, through diode D1A, diode D1B rectification, capacitor C 1 filtering connected main load RL1; The secondary auxiliary winding of transformer T1 and transformer T2 is also respectively through diode D2 and each self-rectifying of diode D3, through capacitor C 2 and capacitor C 3 filtering respectively, other level that one of each self-generating of transformer T1 and transformer T2 is different from main load level (for example: T2 generation+12V, T1 generation+18V), connect assistant load RL2, assistant load RL3 respectively.
Usually, the ultrathin LCD TV of large-screen needs four kinds of level (24V, 12V, 18V, 5Vsb) power supply, and the big (24V/10A of required power output; 12V/2.5A; 18V/1.5A; 5Vsb/1A), in the present embodiment, can main load RL1 be defined as the backlight power supply (+24V), load RL2 be signal plate and TCON plate power supply (+12V), load RL3 be the audio power amplifier power supply (+18V), independently accessory power supply provide standby and signal processing power supply (+5Vsb or+3.3Vsb), wherein standby CPU is generated by standby power.Turn-off the LLC circuit of APFC circuit and DC-DC during standby, reduce loss, so that reach lower stand-by power consumption, other three routes LLC series resonance power supply generates through transformer T1 and transformer T2.
During the LCD television startup, APFC circuit working at first, (this power settings+350V), the LLC series resonant circuit is started working when the APFC output dc voltage reaches certain value.The auxiliary winding of general transformer T2 (for example :+12V/1～2.5A at first loads, the about RL2=12 of equivalent resistance～4.8 ohm, transformer T2 feeds back to elementary equivalent load resistance value and diminishes, cause the elementary winding dividing potential drop of transformer T1 greater than the elementary winding dividing potential drop of transformer T2, and then cause that the secondary main winding voltage of transformer T1 is higher than the secondary main winding voltage of transformer T2; Because the secondary main winding of transformer T1 and transformer T2 (homophase) directly in parallel, when the main winding voltage of transformer T1 is higher than the main winding clamp voltage of transformer T2, the secondary main winding of transformer T1 directly releases energy to the secondary auxiliary winding of transformer T2 through the secondary main winding of transformer T2, has reached the voltage clamp effect of each winding of transformer T1 simultaneously automatically; Under this state, the energy reality of the auxiliary winding of transformer T2 is provided respectively by the elementary and secondary main winding both sides of transformer T2, and circuit can reach the state of a dynamic equilibrium.
In this stage, the application of the combination technique of multiple transformers of the present invention, can not make the complete phase of loss of two transformers, the loss of the secondary coil winding of transformer T1 is a bit larger tham in the loss meeting of the secondary coil winding of transformer T2, and the core loss of T2 also can be a bit larger tham the core loss of T1.But because this moment, power output accounted for the ratio of maximum rated power output lower (be generally less than single transformer output rated power 50%), the temperature rise of T2 transformer does not have too big raising, can use safely fully.
When the backlight of LCD is lighted, after the backlight circuit work, main winding RL1 loads RL1=1.846 ohm, and when the secondary auxiliary winding power of transformer T1 and transformer T2 equated fully, the electric current of its secondary main winding was also equal fully; When the secondary auxiliary winding power of transformer T2 during greater than the secondary auxiliary winding power of transformer T1, can transmit certain power to the secondary auxiliary winding of transformer T2 through the secondary main winding of transformer T1 equally, make output dynamic equilibrium; In like manner,, can transmit certain power to the secondary auxiliary winding of transformer T1, make output dynamic equilibrium through the secondary main winding of transformer T2 when the secondary auxiliary winding power of transformer T1 during greater than the secondary auxiliary winding power of transformer T2; This stage works all the time owing to main winding, and power output accounts for the ratio higher (greater than 75%) of whole output rated maximum power, adds the dynamic equalization characteristic of this kind transformer connected mode load, therefore, the loss of each transformer differs less, and temperature rise is also even substantially.
Concrete when using technical scheme provided by the invention, because transformer T1 and transformer T2 pin are limited, each transformer is on average shared power if desired, and needs N group auxiliary electrical in theory at ordinary times, choosing N transformer can realize, has improved the reliability of whole power supply; When need further reduce the limit for height of power panel, do not need to adopt high-power transformer, can realize by a plurality of wattage transformers.For example make the ultra-thin power supply of 13mm, the EFD32 magnetic core that optional 6.6mm is high, limit for height 9mm behind the band skeleton; The about 50W of the exportable power of each transformer, the 200W power output uses 4 transformers to get final product, and auxiliary simultaneously winding may be output to many 4 kinds of varying levels for using.
In sum, adopt technical scheme of the present invention after, each road stabilization of level of LLC series resonant circuit is functional, needn't add low voltage DC-DC circuit fully in addition and generate other required level; Needn't add the feedback stability circuit in addition, holding circuit stable.Under the stress state, the auxiliary winding of single transformer can not load separately in main load, and the auxiliary winding voltage of each transformer also can obtain effectively clamping down on automatically under this state, and the entire circuit system also can stablize normal long-term work.The present invention provides effective technical support to the ultra-thinization development of LCD liquid crystal television power supply.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of LLC resonant circuit, comprise drive circuit, half-bridge circuit and resonant capacitance, it is characterized in that, described LLC circuit also comprises two or more transformer, the elementary windings in series of described transformer, connect current rectifying and wave filtering circuit after the secondary main winding parallel connection, the output of described secondary main winding provides power supply for main load behind rectifying and wave-filtering.
2, LLC resonant circuit according to claim 1, it is characterized in that, described LLC circuit comprises transformer (T1) and transformer (T2), described transformer (T1) and the positive and negative phase pin of the secondary main winding of transformer (T2) are connected the positive pole of diode (D1A), diode (D1B) respectively, and the negative pole of diode (D1A) and diode (D1B) links to each other with the positive voltage terminal of the positive pole of electric capacity (C1), main load (RL1).
3, LLC resonant circuit according to claim 1 is characterized in that, described transformer also comprises the secondary auxiliary winding that two or more are different, and different voltages are exported in the output of described secondary auxiliary winding behind rectifying and wave-filtering.
4, LLC resonant circuit according to claim 2, it is characterized in that, described transformer (T1) also comprises secondary auxiliary winding, and the output of described secondary auxiliary winding provides power supply for assistant load (RL3) after diode (D3) rectification, electric capacity (C3) filtering.
5, LLC resonant circuit according to claim 4 is characterized in that, described assistant load (RL3) is the audio power amplifier power supply.
6, LLC resonant circuit according to claim 2, it is characterized in that, described transformer (T2) also comprises secondary auxiliary winding, and the output of described secondary auxiliary winding provides power supply for assistant load (RL2) after diode (D2) rectification, electric capacity (C2) filtering.
7, LLC resonant circuit according to claim 6 is characterized in that, described assistant load (RL2) is the signal processing power supply.
8, LLC resonant circuit according to claim 1 is characterized in that, described two or more primary umber of turn is identical, and the secondary main winding number of turn is identical and phase place is identical.
According to the described LLC resonant circuit of claim 1, it is characterized in that 9, described main load is the LCD TV backlight power supply.
10, according to the described LLC resonant circuit of claim 1, it is characterized in that, described half-bridge circuit comprises high-voltage MOS pipe (Q1) and high-voltage MOS pipe (Q2), described primary windings in series is to the mid point of the half-bridge circuit of high pressure metal-oxide-semiconductor (Q1) and high-voltage MOS pipe (Q2) formation, through described resonant capacitance ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101422344A CN101645653B (en) | 2008-08-04 | 2008-08-04 | LLC resonance circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101422344A CN101645653B (en) | 2008-08-04 | 2008-08-04 | LLC resonance circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101645653A true CN101645653A (en) | 2010-02-10 |
| CN101645653B CN101645653B (en) | 2012-05-30 |
Family
ID=41657393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101422344A Active CN101645653B (en) | 2008-08-04 | 2008-08-04 | LLC resonance circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101645653B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315775A (en) * | 2010-07-06 | 2012-01-11 | 上海儒竞电子科技有限公司 | Low-voltage and large-current output direct current (DC)-DC converter |
| CN105281577A (en) * | 2015-06-19 | 2016-01-27 | 惠科电子（深圳）有限公司 | Power amplifier power supply circuit and TV power strip |
| CN106160496A (en) * | 2016-08-17 | 2016-11-23 | 深圳市鼎硕同邦科技有限公司 | A kind of flat surface transformer magnetic integrated connection in series-parallel power-supply system for new-energy automobile |
| CN106329940A (en) * | 2016-11-07 | 2017-01-11 | 江南大学 | Double-transformer serial and parallel structure full-bridge LLC (logical link control) resonant converter |
| CN106602880A (en) * | 2016-10-28 | 2017-04-26 | 深圳朗兴智能云充有限公司 | Large power high efficiency thermal equilibrium LLC resonant converter and control method thereof |
| WO2018010404A1 (en) * | 2016-07-13 | 2018-01-18 | 深圳创维－Rgb电子有限公司 | Power supply and electrical device |
| CN109660125A (en) * | 2017-10-12 | 2019-04-19 | 首利实业股份有限公司 | The circuit structure of high power power power supply unit |
| CN109818504A (en) * | 2018-12-30 | 2019-05-28 | 杭州中恒电气股份有限公司 | A kind of controlled resonant converter of the series-parallel bumpless transfer of wide scope |
| CN110880294A (en) * | 2019-12-10 | 2020-03-13 | 深圳创维－Rgb电子有限公司 | OLED driving power supply and electronic product |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100459390C (en) * | 2002-04-23 | 2009-02-04 | 皇家飞利浦电子股份有限公司 | LLC half-bridge converter |
| TWI271023B (en) * | 2003-08-21 | 2007-01-11 | Sony Corp | Switching power-supply circuit |
| JP2005073371A (en) * | 2003-08-22 | 2005-03-17 | Sony Corp | Switching power supply circuit |
| CN2914482Y (en) * | 2006-05-18 | 2007-06-20 | 高效电子股份有限公司 | Half-bridge LLC resonance converter with synchronous rectifying function |
-
2008
- 2008-08-04 CN CN2008101422344A patent/CN101645653B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315775A (en) * | 2010-07-06 | 2012-01-11 | 上海儒竞电子科技有限公司 | Low-voltage and large-current output direct current (DC)-DC converter |
| CN105281577A (en) * | 2015-06-19 | 2016-01-27 | 惠科电子（深圳）有限公司 | Power amplifier power supply circuit and TV power strip |
| WO2018010404A1 (en) * | 2016-07-13 | 2018-01-18 | 深圳创维－Rgb电子有限公司 | Power supply and electrical device |
| CN106160496A (en) * | 2016-08-17 | 2016-11-23 | 深圳市鼎硕同邦科技有限公司 | A kind of flat surface transformer magnetic integrated connection in series-parallel power-supply system for new-energy automobile |
| CN106602880A (en) * | 2016-10-28 | 2017-04-26 | 深圳朗兴智能云充有限公司 | Large power high efficiency thermal equilibrium LLC resonant converter and control method thereof |
| CN106329940A (en) * | 2016-11-07 | 2017-01-11 | 江南大学 | Double-transformer serial and parallel structure full-bridge LLC (logical link control) resonant converter |
| CN109660125A (en) * | 2017-10-12 | 2019-04-19 | 首利实业股份有限公司 | The circuit structure of high power power power supply unit |
| CN109818504A (en) * | 2018-12-30 | 2019-05-28 | 杭州中恒电气股份有限公司 | A kind of controlled resonant converter of the series-parallel bumpless transfer of wide scope |
| CN110880294A (en) * | 2019-12-10 | 2020-03-13 | 深圳创维－Rgb电子有限公司 | OLED driving power supply and electronic product |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101645653B (en) | 2012-05-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101645653B (en) | LLC resonance circuit | |
| US8094467B2 (en) | Induction power system | |
| EP2670039B1 (en) | Quasi resonant push-pull converter and control method thereof | |
| CN101390286B (en) | Audio power conversion system | |
| CN101136584B (en) | Switch loss reduced single-stage power factor correcting circuit | |
| CN103312178B (en) | A kind of two-way DC/DC changer and apply its battery detection equipment | |
| CN103476176B (en) | Backlight source driving circuit and television set | |
| JPWO2009011091A1 (en) | Switching power supply | |
| US7825606B2 (en) | Fluorescent lamp driver power | |
| CN112737346A (en) | Novel ultra-wide range high-power converter circuit | |
| CN102630368B (en) | There is the flux converter of power factor correction | |
| KR101492965B1 (en) | SLLC Resonant Converter for Bidirectional Power Conversion using auxiliary inductor | |
| Ghazali et al. | High performance single stage power factor correction circuit | |
| US20050135123A1 (en) | Low loss boost converter | |
| CN105281577A (en) | Power amplifier power supply circuit and TV power strip | |
| CN201383895Y (en) | Power source supply device | |
| CN211240180U (en) | Wide voltage range output circuit and electronic device | |
| CN106851925A (en) | High efficiency single-stage LED drive device based on Flyback and Class E | |
| CN100446388C (en) | Power-supply supplying device with low idling consumption | |
| CN209299157U (en) | Power output circuit, power circuit, display circuit, circuit board and display | |
| CN209516948U (en) | A kind of isolation bidirectional DC-DC converter | |
| JP2008258166A (en) | Fluorescent lamp drive power supply | |
| CN105471271A (en) | Superposed push-pull circuit | |
| CN109391163A (en) | A kind of LLC Switching Power Supply and display device | |
| CN218124555U (en) | Auxiliary power supply circuit and switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |