CN103780093B - Switching-type power supply unit - Google Patents
Switching-type power supply unit Download PDFInfo
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- CN103780093B CN103780093B CN201210401121.8A CN201210401121A CN103780093B CN 103780093 B CN103780093 B CN 103780093B CN 201210401121 A CN201210401121 A CN 201210401121A CN 103780093 B CN103780093 B CN 103780093B
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- circuit
- power supply
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- electrically connects
- switched power
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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
Abstract
The invention relates to a switching-type power supply unit which is used for supplying a stable voltage output for a load. The switching-type power supply unit includes a rectifying circuit, a flyback voltage conversion circuit and a non-isolation voltage adjustment circuit. The rectifying circuit receives AC signals and rectifies and then outputs the AC signals. The flyback voltage conversion circuit is electrically connected with the rectifying circuit and used for converting the rectified AC signals into DC signals. The non-isolation voltage adjustment circuit is electrically connected between the flyback voltage conversion circuit and the load and used for eliminating voltage ripples of the DC signals and then outputting the DC signals to the load. Thus setting of a high-voltage capacitor in front of the flyback voltage conversion circuit is not needed and the volume and material cost of the switching power supply unit can be reduced significantly.
Description
Technical field
The present invention relates to a kind of power supply unit, particularly relate to a kind of switching power supply that can suppress output ripple
Device.
Background technology
Along with the progress in epoch, electronic product has been widely applied in the life of the mankind, but energy starved problem
The most serious so that people increasingly pay attention to the service efficiency of electronic product.And most electronic product be both needed to use exchange/
Direct current transducer, is converted into the alternating current power supply in power system the DC source that electronic product needs, therefore needs extensively to inquire into
And study various low cost and high efficiency AC/DC converter.
Ac/dc conversion now is used mostly diode rectification and reaches, although this kind of practice is cheap and simple
Firmly, but due to the serious non-linear distortion of input current so that low-frequency harmonics rolls up, and causes power factor (Power
Factor) too low and increase fictitious power, cause the consuming of energy, will also result in the instability of power system, impact power supply simultaneously
Quality.
Refering to Fig. 1, for the circuit framework of power supply unit now, wherein explanation as a example by adapter (Adapter) 900.
Adapter 900 now mostly is the framework of two-stage type, and prime is booster type (Boost) power factor corrector 910, rear class be every
Release DC-DC converter 920.But, in the area (such as: south east asia) that civil power is more unstable, boost type power because of
Electric capacity C in number correctors 910 can need higher pressure, to prevent the instability of input voltage from causing the circuit of adapter 900
Damage, but the volume of the high C of resistance to voltage capacitance (typically electrochemical capacitor) is excessive, and make cost relatively owing to electrochemical capacitor is sparser
High.Therefore, the power supply unit of low cost, High Power Factor and high conversion efficiency how is realized then for the emphasis of the present invention.
Summary of the invention
It is an object of the invention to provide the switching power supply of a kind of low cost, High Power Factor and high conversion efficiency
Device.
Switched power supply of the present invention, in order to provide the voltage of load stabilization to export, this switched power supply
Comprise rectification circuit, flyback (Flyback) voltage conversion circuit and non-isolated voltage-regulating circuit.Rectification circuit receives to be handed over
Stream signal, and will export after this AC signal rectification.Flyback voltage conversion circuit electrical connection rectification circuit, for by after rectification
AC signal be converted into direct current signal.Non-isolated voltage-regulating circuit electrical connection flyback voltage conversion circuit and load
Between, in order to output after eliminating the voltage ripple of this direct current signal to load.So will need not at flyback voltage conversion circuit
High-voltage capacitor is set before 20, volume and the material cost of switched power supply can be greatly decreased.
Further, flyback voltage conversion circuit includes transforming circuit, switching switch, breakover element and electric capacity.Transformation
One end electrical connection rectification circuit of the primary side of circuit, the other end then electrically connects switching switch；Switching switch has electrical connection and becomes
First end of the primary side of volt circuit, controlled control end and the second end of ground connection；Breakover element can be located at high-pressure side (High
And there is first end of one end of secondary side of electrical connection transforming circuit, and electrically connect non-isolated voltage-regulating circuit Side)
The second end, one end of electric capacity electrically connects the second end of this breakover element, and the other end then electrically connects the secondary side of transforming circuit
The other end.It is preferred that the junction of the secondary side of electric capacity and transforming circuit is ground connection.
Additionally, breakover element may be alternatively located at low-pressure side (Low Side), and in the case, one end electrical connection of electric capacity becomes
One end of the secondary side of volt circuit, the other end of the first end electrical connection electric capacity of breakover element, the second end of breakover element is electrically connected
Connect the other end of the secondary side of transforming circuit.
Breakover element can be diode or various semiconductor switch, such as: metal-oxide half field effect transistor (MOSFET) etc..
Non-isolated voltage-regulating circuit can be synchronous rectification voltage-dropping type (Buck) transducer, including first switch,
Second switch, energy storage inductor and storage capacitor.First switch has first end, controlled of electrical connection flyback voltage conversion circuit
Control end and the second end；Second switch have electrical connection this first switch first end of the second end, controlled control end and
Second end of ground connection；First end of one end electrical connection second switch of energy storage inductor, other end electrical connection load；Storage capacitor
One end electrical connection load, other end ground connection.
Non-isolated voltage-regulating circuit can also be booster type (Boost) transducer or liter-voltage-dropping type (Buck-
Boost) transducer, the output voltage of flyback voltage conversion circuit is depended in the selection of its framework.
The beneficial effects of the present invention is: by prime flyback voltage conversion circuit corrected output factor, rear end non-
Isolated voltage-regulating circuit eliminates voltage ripple, input can be avoided to use the electrochemical capacitor of high pressure, and reach Gao Gong simultaneously
The advantages such as rate factor, high conversion efficiency and low-voltage ripple are little with low cost and volume.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that existing two-stage type adapter is described；
Fig. 2 is the preferred embodiment that switched power supply of the present invention is described；
Fig. 3 is the circuit diagram of the flyback voltage conversion circuit that the present embodiment is described, wherein breakover element is positioned at high-pressure side
(High Side) and explain as a example by diode D；
Fig. 4 is the circuit diagram of the flyback voltage conversion circuit that the present embodiment is described, wherein breakover element is positioned at low-pressure side
(Low Side) and explain as a example by transistor M；
Fig. 5 is the circuit diagram of the non-isolated voltage-regulating circuit that the present embodiment is described；
Fig. 6 be the switched power supply that the present embodiment is described be 90,115,230 and 264 at AC signal voltage
(V) curve chart of the conversion efficiency, and under 25%, 50%, 75% and the 100% of rated output power；And
Fig. 7 be the switched power supply that the present embodiment is described be 90,115,230 and 264 at AC signal voltage
(V) curve chart of the power factor, and under 25%, 50%, 75% and the 100% of rated output power.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the present invention is described in detail:
Refering to Fig. 2, for the preferred embodiment of switched power supply 100 of the present invention, this switched power supply 100
Can be the various power supply equipments such as adapter (Adapter), open frame formula (Open Frame) power supply unit.This enforcement
The switched power supply 100 of example comprises rectification circuit 10, is electrically connected to flyback (Flyback) voltage of rectification circuit 10
Change-over circuit 20, and it is electrically connected to the non-isolated voltage-regulating circuit 30 of flyback voltage conversion circuit 20.The present invention cuts
Switching power supplier 100 is first with single-stage flyback voltage conversion circuit 20 corrected output factor, then passes through non-isolated electricity
Pressure adjusts circuit 30 and eliminates voltage ripple, to provide load RLoadStable voltage output.
Coordinating refering to Fig. 3, rectification circuit 10 includes the first diode D1, the second diode D2, the 3rd diode D3 and the
Four diode D4.
The positive pole of anode electrical connection exchange (AC) power supply of the first diode D1, the negative electrode electrical connection the of the first diode D1
The negative electrode of two diode D2.The negative pole of the anode electrical connection alternating current power supply of the second diode D2.The negative electrode electricity of the 3rd diode D3
Connect the anode of the first diode D1, the plus earth of the 3rd diode D3.The negative electrode electrical connection the two or two of the 4th diode D4
The anode of pole pipe D2, the plus earth of the 4th diode D4.
Flyback voltage conversion circuit 20 includes transforming circuit T, switching switch S, breakover element and electric capacity CP.In embodiment
In, breakover element is positioned at high-pressure side (High Side) and for diode D but it also may for various semiconductor switch, such as: gold
Oxygen half field effect transistor (MOSFET) etc., and electric capacity CPCan be multi-layer ceramic capacitance (Multilayer Ceramic
Capacitor, MLCC), solid capacitor (Polymer Capacitor), or liquid aluminium matter electrochemical capacitor etc., but whether lead
Logical element or electric capacity CPIt is not limited with the present embodiment or mentioned kind.
One end electrical connection rectification circuit 10 of the primary side of transforming circuit T, the other end then electrically connects switching switch S.Switching
Switch S is N-type metal-oxide half field effect transistor, and it has the drain electrode (the first end) of primary side of electrical connection transforming circuit T, electrical connection
The grid (control end) of PWM module (PWM, not shown), and the source electrode (the second end) of ground connection.The anode of diode D is (i.e.
First end of breakover element) one end of secondary side of electrical connection transforming circuit T, its negative electrode (i.e. the second end of breakover element) is electrically connected
Connect non-isolated voltage-regulating circuit 30.Electric capacity CPOne end electrical connection diode D negative electrode, the other end then electrically connect transformation electricity
The other end of the secondary side of road T.And in the present embodiment, electric capacity CPIt is ground connection with the junction of the secondary side of transforming circuit T.
Additionally, the breakover element of the present invention can also be positioned at low-pressure side (Low Side), as shown in Figure 4, it is with transistor M
As a example by but it also may for diode D.Transistor M has and electric capacity CPThe first end (i.e. first of breakover element of the other end
End), the control end of electrical connection PWM module (PWM, not shown), and the second of the other end of the secondary side of transforming circuit T
End (i.e. the second end of breakover element), and under this aspect, electric capacity CPIt is ground connection with the junction of transistor M.Certainly, flyback
The circuit design of voltage conversion circuit 20 is not limited to this, if breakover element is positioned at high-pressure side and is N-type MOSFET crystal
Guan Shi, the first end of breakover element is the drain electrode of N-type metal-oxide half field effect transistor, and the second end of breakover element is N-type gold
The source electrode of oxygen half field effect transistor；If breakover element is positioned at low-pressure side and is diode, the first end of breakover element is this
The anode of diode, the second end of breakover element is the negative electrode of this diode, can reach effect of the present invention the most equally.
Coordinating refering to Fig. 5, the non-isolated voltage-regulating circuit 30 of the present embodiment turns for synchronous rectification voltage-dropping type (Buck)
Parallel operation, including the first switch Q1, second switch Q2, energy storage inductor LSAnd storage capacitor CS。
First switch Q1 is N-type metal-oxide half field effect transistor, and it has the electricity of electrical connection flyback voltage conversion circuit 20
Hold CPDrain electrode (the first end), electrical connection PWM module (PWM) grid (control end) and source electrode (the second end).Second opens
Closing Q2 is N-type metal-oxide half field effect transistor, and it has the drain electrode (the first end) of source electrode of electrical connection the first switch Q1, electrical connection arteries and veins
The grid (control end) of width modulation module (PWM), and the source electrode (the second end) of ground connection.Energy storage inductor LSOne end electrical connection second
The drain electrode of switch Q2, the other end then electrically connects load RLoad.Storage capacitor CSCan be liquid aluminium matter electrochemical capacitor, solid capacitor, amass
Layer ceramic condenser (MLCC) etc., but be not limited with mentioned kind, its one end electrical connection load RLoad, the other end then ground connection.Especially
Illustrating, non-isolated voltage-regulating circuit 30 can also be booster type (Boost) transducer, liter-voltage-dropping type (Buck-
Boost) the various electric pressure converter such as transducer (Converter), or voltage regulator (Regulator) etc., its framework
Select to depend on the output voltage of flyback voltage conversion circuit 20, and the first switch Q1 and second switch Q2 is alternatively p-type gold
Oxygen half field effect transistor, is neither limited with the present embodiment.
The first switch Q1 and second switch Q2 switching, non-isolated electricity is suitably controlled by PWM module (PWM)
Pressure adjustment circuit 30 can be as shown in following table one in the conversion efficiency of 25%, 50%, 75% and the 100% of rated output power:
Table one
| Vin(V) | Iin(A) | Vout(V) | Iout(A) | η(%) |
| 23.82 | 0.953 | 19.018 | 1.184 | 99.24 |
| 23.69 | 1.913 | 19.014 | 2.367 | 99.31 |
| 23.56 | 2.885 | 19.010 | 3.553 | 99.35 |
| 23.39 | 3.884 | 19.005 | 4.736 | 99.04 |
Special instruction, the application gained that table one is is portable power source adapter with switched power supply 100
Experimental data, and Vin and Iin be respectively voltage and the electric current of input exchange signal, Vout and Iout is respectively non-isolated electricity
Pressure adjusts output voltage and the output electric current of circuit 30, and η is the conversion efficiency of non-isolated voltage-regulating circuit 30.Therefore, logical
Crossing the design of the present invention, this switched power supply 100, compared to now with the portable power source adapter of wattage level, exports ripples
Wave voltage will can be reduced to originally 10%.
Rectification circuit 10 receives the AC signal that exchange (AC) power supply provides, and exports to returning after this AC signal rectification
Formula of speeding voltage conversion circuit 20, flyback voltage conversion circuit 20 in order to revise the power factor of switched power supply 100,
Alternating current to be modified to sinusoidal wave form synchronous with supply voltage, and the AC signal after rectification is converted into direct current letter
Number, non-isolated voltage-regulating circuit 30 exports to loading R after eliminating the voltage ripple of this direct current signal againLoad.In other words,
This switched power supply 100 carrys out corrected output factor by single-stage flyback voltage conversion circuit 20, to avoid input
Use the electrochemical capacitor of high pressure, recycle simple non-isolated voltage-regulating circuit 30 and can eliminate the ripple of output voltage,
To solve to connect ripple problems of too because of the 120Hz caused without primary side high-voltage electrolysis capacitor, reach High Power Factor, height simultaneously
Conversion efficiency and effect of low-voltage ripple, and can also be by controlling electric capacity CPMaintenance is adjusted with the specification according to customer demand
Time (Hold-up Time), it is to avoid the waste of cost.
Special instruction, the primary side of the transforming circuit T of flyback voltage conversion circuit 20 is not required to arrange volume
The resistance to voltage capacitance of bigger height, and the electric capacity used at flyback voltage conversion circuit 20 secondary side is high pressure because need not, therefore
The volume of switched power supply 100 and material cost can be greatly reduced, also due to decrease capacity load, therefore need not
Extra power factor correcting circuit carrys out hoisting power factor, also can meet relevant laws and regulations of energy.Due to switched power supply 100
Volume can reduce 20%, therefore the particularly suitable product at limited space, such as Mobile electric power adapter.
Refering to Fig. 6 and Fig. 7, for the present embodiment switched power supply 100 AC signal voltage be 90,115,
230 and 264 (V), and the conversion efficiency (Efficiency) under 25%, 50%, 75% and the 100% of rated output power and merit
Rate factor (Power Factor).Special instruction, Fig. 5 and Fig. 6 is with switched power supply 100 for action electricity equally
The experimental data of the application gained of source adapter, wherein, the minimum average conversion efficiency of this switched power supply 100 is
87.91%, and also may conform to the requirement of the power factor laws and regulations of energy more than 0.9, really can reach High Power Factor and high conversion
The purpose of efficiency.
In sum, switched power supply 100 of the present invention uses single-stage flyback voltage conversion circuit by prime
20 carry out corrected output factor, so will need not arrange before flyback voltage conversion circuit 20 high-voltage capacitor, also drop simultaneously
The circuit infringement of low unstable the caused switched power supply 100 because of input ac power, therefore it is defeated to can be applicable to civil power
Enter shakiness or the higher area of civil power.Relend afterwards and eliminated secondary side by rear end by non-isolated voltage-regulating circuit 30
High voltage connects ripple so that in the specification of output power limit, reaches to improve output and effect of suppression output ripple, and
The holistic cost of the switched power supply 100 of the present invention is compared to the power supply unit now with high-voltage electrolysis capacitor
Cost savings 15-20%, furthermore the present invention so design and also equally can accord with the power supply unit of the design of two-stage type the most now
Close the requirement of the power factor laws and regulations of energy more than 0.9, therefore really can reach the purpose of the present invention.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction, though
So the present invention discloses as above with preferred embodiment, but is not limited to the present invention, any technology people being familiar with this specialty
Member, in the range of without departing from technical solution of the present invention, when the method for available the disclosure above and technology contents make a little more
Move or be modified to the Equivalent embodiments of equivalent variations, as long as being the content without departing from technical solution of the present invention, according to the present invention's
Any simple modification, equivalent variations and the modification that above example is made by technical spirit, all still falls within technical solution of the present invention
In the range of.
Claims (9)
1. a switched power supply, in order to provide the voltage of load stabilization to export；It is characterized in that:
This switched power supply comprises:
Rectification circuit, receives AC signal, and will export after this AC signal rectification；
Flyback voltage conversion circuit, electrically connects this rectification circuit, for the AC signal after this rectification is converted into direct current letter
Number；And
Non-isolated voltage-regulating circuit, electrically connects between this flyback voltage conversion circuit and this load, straight in order to eliminate this
Export to this load after the voltage ripple of stream signal；
Wherein, this non-isolated voltage-regulating circuit includes the first switch, second switch, energy storage inductor and storage capacitor, and this is years old
One switch has electrical connection the first end of this flyback voltage conversion circuit, controlled control end and the second end；This second switch
There is the first end of the second end of this first switch of electrical connection, controlled control end and the second end of ground connection；This energy storage inductor
One end electrically connects the first end of this second switch, and the other end electrically connects this load；One end of this storage capacitor electrically connects this load,
Other end ground connection.
2. switched power supply as claimed in claim 1, it is characterised in that: this flyback voltage conversion circuit includes becoming
Volt circuit, switching switch, breakover element and electric capacity, one end of the primary side of this transforming circuit electrically connects this rectification circuit, another
End then electrically connects this switching switch；This switching switch has electrical connection first end of primary side of this transforming circuit, controlled control
End processed and the second end of ground connection；This breakover element has first end of the one end of the secondary side electrically connecting this transforming circuit, and electricity
Connecting the second end of this non-isolated voltage-regulating circuit, one end of this electric capacity electrically connects the second end of this breakover element, another
End then electrically connects the other end of the secondary side of this transforming circuit.
3. switched power supply as claimed in claim 2, it is characterised in that: this breakover element is diode, this conducting
The anode that first end is this diode of element, the negative electrode that the second end is this diode of this breakover element.
4. switched power supply as claimed in claim 2, it is characterised in that: this breakover element is semiconductor switch.
5. switched power supply as claimed in claim 1, it is characterised in that: this flyback voltage conversion circuit includes becoming
Volt circuit, switching switch, breakover element and electric capacity, one end of the primary side of this transforming circuit electrically connects this rectification circuit, another
End then electrically connects this switching switch；This switching switch has electrical connection first end of primary side of this transforming circuit, controlled control
End processed and the second end of ground connection；One end of this electric capacity electrically connects one end of the secondary side of this transforming circuit, and this breakover element has
Electrically connect the first end of the other end of this electric capacity, and electrically connect the second end of the other end of the secondary side of this transforming circuit.
6. switched power supply as claimed in claim 5, it is characterised in that: this breakover element is diode, this conducting
The anode that first end is this diode of element, the negative electrode that the second end is this diode of this breakover element.
7. switched power supply as claimed in claim 5, it is characterised in that: this breakover element is semiconductor switch.
8. switched power supply as claimed in claim 1, it is characterised in that: this non-isolated voltage-regulating circuit is fall
Pressure type transducer, boosting type converter and liter-buck converter one of them.
9. switched power supply as claimed in claim 1, it is characterised in that: this switched power supply is adapter
Or open frame formula power supply unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210401121.8A CN103780093B (en) | 2012-10-19 | 2012-10-19 | Switching-type power supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210401121.8A CN103780093B (en) | 2012-10-19 | 2012-10-19 | Switching-type power supply unit |
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| Publication Number | Publication Date |
|---|---|
| CN103780093A CN103780093A (en) | 2014-05-07 |
| CN103780093B true CN103780093B (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210401121.8A Active CN103780093B (en) | 2012-10-19 | 2012-10-19 | Switching-type power supply unit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6115516B2 (en) * | 2014-05-09 | 2017-04-19 | 株式会社村田製作所 | Voltage smoothing circuit, voltage conversion circuit, and voltage control method applied to multilayer capacitor |
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| TW200838114A (en) * | 2007-03-09 | 2008-09-16 | Leadtrend Tech Corp | Switching-mode power converter and pulse-width-modulation control circuit for primary-side feedback control |
| CN101951175A (en) * | 2010-08-17 | 2011-01-19 | 深圳市核达中远通电源技术有限公司 | Flyback synchronous rectification control circuit |
| CN102005942A (en) * | 2010-11-05 | 2011-04-06 | 烟台东方威思顿电气有限公司 | Method for acquiring low-voltage power from high-voltage electric line |
| CN102427293A (en) * | 2012-01-11 | 2012-04-25 | 西南交通大学 | Low output ripple wave parallel power-factor correction (PFC) transform control method and device |
| CN102497105A (en) * | 2011-12-02 | 2012-06-13 | 深圳市菱晟科技有限公司 | Synchronous-rectification flyback switching power supply device and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6900995B2 (en) * | 2001-11-29 | 2005-05-31 | Iwatt, Inc. | PWM power converter controlled by transistion detection of a comparator error signal |
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2012
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1722593A (en) * | 2004-07-14 | 2006-01-18 | 伊博电源（杭州）有限公司 | Self-drive circuit for switch power supply |
| TW200838114A (en) * | 2007-03-09 | 2008-09-16 | Leadtrend Tech Corp | Switching-mode power converter and pulse-width-modulation control circuit for primary-side feedback control |
| CN101951175A (en) * | 2010-08-17 | 2011-01-19 | 深圳市核达中远通电源技术有限公司 | Flyback synchronous rectification control circuit |
| CN102005942A (en) * | 2010-11-05 | 2011-04-06 | 烟台东方威思顿电气有限公司 | Method for acquiring low-voltage power from high-voltage electric line |
| CN102497105A (en) * | 2011-12-02 | 2012-06-13 | 深圳市菱晟科技有限公司 | Synchronous-rectification flyback switching power supply device and control method thereof |
| CN102427293A (en) * | 2012-01-11 | 2012-04-25 | 西南交通大学 | Low output ripple wave parallel power-factor correction (PFC) transform control method and device |
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| CN103780093A (en) | 2014-05-07 |
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Effective date of registration: 20161213 Address after: Guangzhou science and Technology Development Zone, Guangdong high tech Industrial Zone, 25 Applicant after: Lite-On Electronic (Guangzhou) Co., Ltd. Applicant after: Guangbao Sci-Tech Co., Ltd. Address before: Ruiguang road Taiwan Taipei City Neihu district China No. 392 22 floor Applicant before: Guangbao Sci-Tech Co., Ltd. |
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