CN110418458A - A kind of Improvement type LED drive circuit, circuit board - Google Patents
A kind of Improvement type LED drive circuit, circuit board Download PDFInfo
- Publication number
- CN110418458A CN110418458A CN201910577451.4A CN201910577451A CN110418458A CN 110418458 A CN110418458 A CN 110418458A CN 201910577451 A CN201910577451 A CN 201910577451A CN 110418458 A CN110418458 A CN 110418458A
- Authority
- CN
- China
- Prior art keywords
- transformer
- arm switch
- switch
- voltage
- circuit
- 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
- 230000006872 improvement Effects 0.000 title claims abstract description 21
- 238000004804 winding Methods 0.000 claims abstract description 30
- 230000009466 transformation Effects 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 241001465382 Physalis alkekengi Species 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Classifications
-
- 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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of Improvement type LED drive circuit, circuit board, including switch module, resonance circuit, several groups voltage transformation module, light adjusting controller；Rectified rail voltage is supplied to the input side of resonance circuit for the movement by switch module by switch module；Resonance circuit concatenates several groups voltage transformation module；Every group of voltage transformation module output end is connected with the LED string of one group of series connection；Light adjusting controller is connect respectively for adjusting the brightness of LED string by adjusting voltage with every group of voltage transformation module.The present invention is gone here and there by the LED that one group of switch module concatenates multiple groups transformer by resonance circuit to drive multiple groups to be connected in series, there is group, individual dimming functions by the tertiary winding that light adjusting controller is connected to each transformer, simplify the framework of volume driving circuit, cost is greatly reduced, and improves the transfer efficiency of integrated circuit.
Description
Technical field
The present invention relates to LED circuit design fields, and in particular to a kind of Improvement type LED drive circuit, circuit board.
Background technique
Traditional LED drive circuit is in order to achieve the purpose that accurate control LED current, other than main circuit, it is necessary to increase
Element composition feedback circuit reaches constant current control.Such circuit framework will lead to circuit complexity promotion, increased costs, and meeting
There are more power losses in causing circuit whole efficiency low on element, so the space that is significantly improved in efficiency, most root
This method is exactly to set about from simplified drive circuit structure, now most of with more with current LED encapsulation and single brightness
LED combination is that light source module group reaches required illumination.If desired drive more LED combinations at lamps and lanterns, every group of lamps and lanterns need
Independent translation circuit provides constant current driving respectively, and manufacturing cost is greatly improved.
Traditional LED drive circuit input ac power answers safety requirement, and input needs electrical isolation with output end.It is different
Photochromic LED characteristic is not quite similar, and multiple groups variety classes and the LED of wattage is if desired driven to need individually with power conversion circuits
It drives, necessary requirement is not achieved in traditional circuit.
Summary of the invention
Safety requirement is answered for traditional LED drive circuit input ac power, input needs electrical isolation with output end.
Different photochromic LED characteristics are not quite similar, and multiple groups variety classes and the LED of wattage needs is if desired driven to convert with energy individually
The problem of circuit drives, and necessary requirement is not achieved in traditional circuit, the present invention provide a kind of Improvement type LED drive circuit, circuit
Plate.
The technical scheme is that
In a first aspect, technical solution of the present invention provides a kind of Improvement type LED drive circuit, including switch module, resonance electricity
Road, several groups voltage transformation module, light adjusting controller；
Rectified rail voltage is supplied to the input of resonance circuit for the movement by switch module by switch module
Side；
Resonance circuit concatenates several groups voltage transformation module；Every group of voltage transformation module output end is connected with one group of series connection and connects
The LED string connect；
Light adjusting controller is connect respectively for adjusting the bright of LED string by adjusting voltage with every group of voltage transformation module
Degree.
Preferably, the switch module includes the upper arm switch and lower arm switch being connected in series；Upper arm switch and lower arm
The tie point of switch is connect with resonance circuit；
Rectified mains positive voltage output end, the leakage of the source electrode of upper arm switch and lower arm switch are coupled in the drain electrode of upper arm switch
Pole connection；
The source electrode of lower arm switch is coupled with rectified mains negative voltage output end.
Preferably, every group of voltage transformation module includes a transformer, and each transformer is sequentially connected in series company by main winding
It connects；The transformer main winding first end is connect with resonance circuit output end, and the first end of transformer time winding is connected with the
The anode of the anode of one rectifier diode, the LED string of the cathode and series connection of the first rectifier diode connects；Transformer time around
The second end of group is connected with the anode of the second rectifier diode, and the cathode of the second rectifier diode is connected to the first rectifier diode
Cathode；The intermediate ends of transformer time winding are connected to the cathode of the LED string of series connection；
Transformer main winding second end is connected to the first end of transformer main winding connected in series；The end of series connection
The second end of transformer main winding be coupled to the source electrode of lower arm switch；
The tertiary winding of each transformer passes through control switch and connects into closed circuit, the control switch and light modulation
Controller connection.
Preferably, the source electrode of upper arm switch is connected to the drain electrode of upper arm switch by upper arm Switch main body diode；
The source electrode of lower arm switch is connected to the drain electrode of lower arm switch by lower arm Switch main body diode.
Preferably, the both ends of the LED string of series connection are parallel with filter capacitor.
Preferably, the both ends of rectified mains voltage output are parallel with first capacitor；
Preferably, resonance circuit includes the first inductance and the second capacitor being connected in series.
Preferably, rectified mains include the low-pass filter for receiving the input from electric main；Low-pass filter it is defeated
Outlet is connected with rectifier, and the output end of rectifier is connected to isolation circuit, and the output end of isolation circuit is provided to switch module
Voltage output.
On the other hand, the present invention provides a kind of LED circuit board, and the circuit board includes LED drive circuit, described
LED drive circuit is the Improvement type LED drive circuit that technical solution of the present invention first aspect provides.
As can be seen from the above technical solutions, the invention has the following advantages that the present invention is passed through by one group of switch module
The LED string that resonance circuit concatenates multiple groups transformer multiple groups is driven to be connected in series, is connected to each transformation by light adjusting controller
The tertiary winding of device has group, individual dimming functions, simplifies the framework of volume driving circuit, cost is greatly reduced, and improve
The transfer efficiency of integrated circuit.
In addition, design principle of the present invention is reliable, structure is simple, has very extensive application prospect.
It can be seen that compared with prior art, the present invention have substantive distinguishing features outstanding and it is significant ground it is progressive, implementation
Beneficial effect be also obvious.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of Improvement type LED drive circuit connection schematic diagram that the embodiment of the present invention one provides.
Fig. 2 is a kind of Improvement type LED drive circuit connection schematic diagram that the embodiment of the present invention one provides.
Fig. 3 provides Improvement type LED drive circuit operation schematic diagram for the embodiment of the present invention.
Fig. 4 provides Improvement type LED drive circuit working timing figure for the embodiment of the present invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
Embodiment one
As shown in Figure 1, a kind of Improvement type LED drive circuit, including the conversion of switch module, resonance circuit, several groups voltage
Module, light adjusting controller U4；
Rectified rail voltage is supplied to the input of resonance circuit for the movement by switch module by switch module
Side；The both ends of the rectified mains voltage output are parallel with first capacitor C1；
Resonance circuit concatenates several groups voltage transformation module；Every group of voltage transformation module output end is connected with one group of series connection and connects
The LED string Load connect；It is respectively Co1- that the both ends of the LED string Load of every group of series connection are parallel with a filter capacitor respectively
Con；
Light adjusting controller U4 is connect respectively for adjusting the bright of LED string by adjusting voltage with every group of voltage transformation module
Degree.
The switch module includes the upper arm switch S1 and lower arm switch S2 being connected in series；Upper arm switch S1 and lower arm are opened
The tie point for closing S2 is connect with resonance circuit；
Rectified mains positive voltage output end, the source electrode of upper arm switch S1 and lower arm switch are coupled in the drain electrode of upper arm switch S1
The drain electrode of S2 connects；The source electrode of upper arm switch S1 is connected to the drain electrode of upper arm switch S1 by upper arm Switch main body diode Ds1；
The source electrode of lower arm switch S2 is connected to the drain electrode of lower arm switch S2 by lower arm Switch main body diode Ds2.
The source electrode of lower arm switch S2 is coupled with rectified mains negative voltage output end；Resonance circuit includes first be connected in series
Inductance Lr and the second capacitor Cr.
Every group of voltage transformation module includes a transformer Ti (positive integer that i is 1-n), each transformer Ti by it is main around
Group is sequentially connected in series；Transformer T1 main winding first end is connect with resonance circuit output end, and the first of T1 winding of transformer
End is connected with the anode of the first rectifier diode D1, the anode of the LED string of the cathode and series connection of the first rectifier diode D1
Connection；The second end of T1 winding of transformer is connected with the anode of the second rectifier diode D2, the yin of the second rectifier diode D2
Pole is connected to the cathode of the first rectifier diode D1；The intermediate ends of T1 winding of transformer are connected to the LED string of series connection
Cathode；
Transformer T1 main winding second end is connected to the first end of transformer T2 main winding connected in series；It is sequentially connected in series,
The second end of the transformer Tn main winding of the end of series connection is coupled to the source electrode of lower arm switch S2；
The tertiary winding of each transformer Ti, which passes through the control switch Sci positive integer of 1-n (i be) and connects into, to be closed back
Road, the control switch Sci are connect with light adjusting controller U4.
Rectified mains include the low-pass filter for receiving the input from electric main；The output end of low-pass filter connects
There is rectifier, the output end of rectifier is connected to isolation circuit, and the output end of isolation circuit provides voltage output to switch module.
In the present embodiment by taking one group of transformer as an example, as Figure 2-3, the course of work of the invention is described, this
In embodiment, it is assumed that all circuit elements are all ideal element conducting resistance and forward conducting voltage is all ignored, and need
Illustrate, in the present embodiment, in order to operate in resonance circuit under inductive load mode, setting operating frequency is greater than resonance
Frequency, input is sufficiently large with output capacitance value, input voltage and output voltage is considered as constant voltage, if transformer tertiary winding Nt
Dimmer switch Sdim conducting when, secondary winding Ns1, Ns2 do not have energy output；When dimmer switch Sdim cut-off, secondary winding
Ns1, Ns2 just have energy output, and analysis operating principle is removed when ending in the present embodiment with dimmer switch Sdim.
There are upper arm switch S1, lower arm switch S2 and upper arm Switch main body diode DS1, lower arm Switch main body diode DS2,
Stable state running hours are divided into four kinds of operating modes in switching cycle, as shown in Figure 3-4, carry out below with regard to each operating mode
Explanation.
Operating mode I: when arm switch S2 ends instantly, into operating mode I；It is born since resonance circuit is designed at inductive
It carries, resonance current ir lags behind input voltage, so ir is negative value cocurrent through two pole of upper arm Switch main body in the moment of S2 cut-off
Pipe DS1 simultaneously continues to rise, rectification diode D2 conducting, after of short duration dead time, when the driving of upper arm switch S1 is believed
Number high potential is become from low potential, arm switch S1 in driving, at this point, ir is still negative value, S1 is not connected immediately, and DS1 is persistently led
It is logical to enter Working mould Formula II until ir rises to zero, because switching when S1 switched conductive across voltage is zero, there is zero voltage switching
The advantages of, reduce switch cost.
Working mould Formula II: when ir becomes positive value by negative value, upper arm Switch main body diode DS1 cut-off, S1 conducting, rectification
Diode D1 conducting, rectifier diode D2 cut-off, later, ir slowly declines after reaching peak value, until upper arm switching drive signal
Low potential is become from high potential, ends arm switch S1, enters Working mould formula III at this time.
Working mould formula III: when upper arm switch S1 cut-off, ir is still positive value, and current path is transferred to by upper arm switch S1
Lower arm Switch main body diode DS2, after of short duration dead time, the driving signal of lower arm switch becomes high electricity from low potential
Position drives lower arm switch S2, and the switching when driving signal reaches no-voltage, ir is still positive at this time, and S2 is not connected immediately, DS1
Constant conduction enters Working mould formula IV until ir near zero, and rectifier diode D1 continues to be connected.
Working mould formula IV: when ir becomes negative value from positive value, lower arm Switch main body diode DS2 cut-off, S2 is connected, whole
Diode D2 conducting is flowed, rectifier diode D1 cut-off is later, so difficult after ir to negative half period peak value to rise, until lower arm switch
Driving signal becomes low potential from high potential, ends lower arm switch S2, returns to operating mode I.
Embodiment two
The embodiment of the present invention provides a kind of LED circuit board, and the circuit board includes LED drive circuit, and the LED drives
Dynamic circuit is the Improvement type LED drive circuit that the embodiment of the present invention one provides.
Although by reference to attached drawing and combining the mode of preferred embodiment to the present invention have been described in detail, the present invention
It is not limited to this.Without departing from the spirit and substance of the premise in the present invention, those of ordinary skill in the art can be to the present invention
Embodiment carry out various equivalent modifications or substitutions, and these modifications or substitutions all should in covering scope of the invention/appoint
What those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, answer
It is included within the scope of the present invention.Therefore, protection scope of the present invention is answered described is with scope of protection of the claims
It is quasi-.
Claims (9)
1. a kind of Improvement type LED drive circuit, which is characterized in that including switch module, resonance circuit, several groups voltage modulus of conversion
Block, light adjusting controller (U4)；
Rectified rail voltage is supplied to the input side of resonance circuit for the movement by switch module by switch module；
Resonance circuit concatenates several groups voltage transformation module；Every group of voltage transformation module output end is connected with one group of series connection
LED string (Load)；
Light adjusting controller (U4) is connect respectively for adjusting the bright of LED string by adjusting voltage with every group of voltage transformation module
Degree.
2. a kind of Improvement type LED drive circuit according to claim 1, which is characterized in that
The switch module includes the upper arm switch (S1) and lower arm switch (S2) being connected in series；Upper arm switch (S1) and lower arm
The tie point of switch (S2) is connect with resonance circuit；
Rectified mains positive voltage output end, the source electrode and lower arm switch of upper arm switch (S1) are coupled in the drain electrode of upper arm switch (S1)
(S2) drain electrode connection；
The source electrode of lower arm switch (S2) is coupled with rectified mains negative voltage output end.
3. a kind of Improvement type LED drive circuit according to claim 2, which is characterized in that every group of voltage transformation module packet
A transformer is included, each transformer is sequentially connected in series by main winding；Transformer (T1) main winding first end and resonance electricity
The connection of road output end, the first end of transformer (T1) secondary winding are connected with the anode of the first rectifier diode (D1), the first rectification
The anode of the LED string of the cathode and series connection of diode (D1) connects；The second end of transformer (T1) secondary winding is connected with
The cathode of the anode of two rectifier diodes (D2), the second rectifier diode (D2) is connected to the yin of the first rectifier diode (D1)
Pole；The intermediate ends of transformer time winding are connected to the cathode of the LED string of series connection；
Transformer (T1) main winding second end is connected to the first end of transformer connected in series (T2) main winding；It is sequentially connected in series,
The second end of the transformer main winding of the end of series connection is coupled to the source electrode of lower arm switch (S2)；
The tertiary winding of each transformer passes through control switch and connects into closed circuit, the control switch and brightness adjustment control
Device (U4) connection.
4. a kind of Improvement type LED drive circuit according to claim 3, which is characterized in that the source electrode of upper arm switch (S1)
The drain electrode of upper arm switch (S1) is connected to by upper arm Switch main body diode (Ds1)；
The source electrode of lower arm switch (S2) is connected to the drain electrode of lower arm switch (S2) by lower arm Switch main body diode (Ds2).
5. a kind of Improvement type LED drive circuit according to claim 4, which is characterized in that the two of the LED string of series connection
End is parallel with filter capacitor.
6. a kind of Improvement type LED drive circuit according to claim 1, which is characterized in that the rectified mains voltage
The both ends of output are parallel with first capacitor (C1).
7. a kind of Improvement type LED drive circuit according to claim 1, which is characterized in that resonance circuit includes that series connection connects
The first inductance (Lr) and the second capacitor (Cr) connect.
8. a kind of Improvement type LED drive circuit according to claim 1, which is characterized in that rectified mains include receiving
From the low-pass filter of the input of electric main；The output end of low-pass filter is connected with rectifier, and the output end of rectifier connects
It is connected to isolation circuit, the output end of isolation circuit provides voltage output to switch module.
9. a kind of LED circuit board, which is characterized in that the circuit board includes the described in any item LED drivings of claim 1-8
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910577451.4A CN110418458B (en) | 2019-06-28 | 2019-06-28 | Improved LED drive circuit and circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910577451.4A CN110418458B (en) | 2019-06-28 | 2019-06-28 | Improved LED drive circuit and circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110418458A true CN110418458A (en) | 2019-11-05 |
| CN110418458B CN110418458B (en) | 2021-11-26 |
Family
ID=68358706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910577451.4A Active CN110418458B (en) | 2019-06-28 | 2019-06-28 | Improved LED drive circuit and circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110418458B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873739A (en) * | 2009-04-27 | 2010-10-27 | 台达电子工业股份有限公司 | Current-balancing supply circuit with multiple groups of DC loads |
| US20100301982A1 (en) * | 2009-06-01 | 2010-12-02 | Osram Gesellschaft Mit Beschraenkter Haftung | High frequency transformer and multi-output constant current source with high frequency transformer |
| CN102014555A (en) * | 2010-09-30 | 2011-04-13 | 光羿科技有限公司 | Integrated LED lamp serial driver device |
| US20110248638A1 (en) * | 2010-04-09 | 2011-10-13 | Sanken Electric Co., Ltd. | Led driving apparatus |
| CN106973457A (en) * | 2017-01-05 | 2017-07-21 | 福州大学 | Isolated form high-power LED driving power source and its implementation that a kind of multiple-channel output flows |
| US10034336B1 (en) * | 2017-09-22 | 2018-07-24 | Dialog Semiconductor (Uk) Limited | Controlling output voltage to achieve ultra-low standby power in dim-to-off LED applications |
-
2019
- 2019-06-28 CN CN201910577451.4A patent/CN110418458B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873739A (en) * | 2009-04-27 | 2010-10-27 | 台达电子工业股份有限公司 | Current-balancing supply circuit with multiple groups of DC loads |
| US20100301982A1 (en) * | 2009-06-01 | 2010-12-02 | Osram Gesellschaft Mit Beschraenkter Haftung | High frequency transformer and multi-output constant current source with high frequency transformer |
| US20110248638A1 (en) * | 2010-04-09 | 2011-10-13 | Sanken Electric Co., Ltd. | Led driving apparatus |
| CN102014555A (en) * | 2010-09-30 | 2011-04-13 | 光羿科技有限公司 | Integrated LED lamp serial driver device |
| CN106973457A (en) * | 2017-01-05 | 2017-07-21 | 福州大学 | Isolated form high-power LED driving power source and its implementation that a kind of multiple-channel output flows |
| US10034336B1 (en) * | 2017-09-22 | 2018-07-24 | Dialog Semiconductor (Uk) Limited | Controlling output voltage to achieve ultra-low standby power in dim-to-off LED applications |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110418458B (en) | 2021-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203691238U (en) | Electronic converter and related illuminating system | |
| CN202026494U (en) | Capacity isolation multi-path constant current output resonant mode direct current/direct current transformer | |
| CN101835317A (en) | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function | |
| CN100379132C (en) | Soft-switch PWM interleaving shunt-wound two-transistor forward power converter | |
| CN105119391A (en) | High-efficiency electric energy transmitting terminal and wireless electric energy transmission apparatus | |
| CN101951159A (en) | Capacitor isolated type multipath constant current output resonant mode DC/DC transformer | |
| CN201690655U (en) | Flyback road lamp illuminating LED constant-current driving power supply with intelligent dimming function | |
| CN103813589A (en) | Isolation type high-power light emitting diode (LED) driving power source with multi-output current sharing | |
| CN106877635B (en) | The low damage driving circuit of isolated form high frequency | |
| CN103269164B (en) | The quasi-single-stage high power factor circuit of former limit current constant control and device | |
| CN102137524A (en) | High-efficiency control method for balance-driving light-emitting diode (LED) | |
| CN109661072A (en) | LLC resonant converter, LED drive circuit and its control method | |
| CN109451628A (en) | Single-stage isolated type LED drive power based on GaN device | |
| CN106026623B (en) | A kind of isolated electronic switch | |
| CN109089343A (en) | LED power source power supply unit | |
| CN109068444A (en) | A kind of single-stage non-isolation type valley fill type no electrolytic capacitor LED drive power and switching method | |
| CN201312262Y (en) | High-frequency switch power supply with higher conversion efficiency | |
| CN205141847U (en) | Efficient electric energy transmitting terminal and wireless power transmission device | |
| CN105162315B (en) | The low total harmonic distortion high power factor correction device and method of charge pump type | |
| CN105530724B (en) | Independent dimming multipath LED drive circuit can be flowed based on SCC | |
| CN209593841U (en) | Single-stage isolated type LED drive power based on GaN device | |
| CN110418458A (en) | A kind of Improvement type LED drive circuit, circuit board | |
| CN207782664U (en) | Three Level Full Bridge Sofe Switch convertor circuits, welding machine, electrolysis water power supply and charger | |
| WO2022007667A1 (en) | Power adapter | |
| CN108966418A (en) | A kind of multiple constant current LED drive power based on high-frequency ac square wave bus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |