CN106712483B - A kind of guard method of circuit of synchronous rectification, charger and charger - Google Patents
A kind of guard method of circuit of synchronous rectification, charger and charger Download PDFInfo
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- CN106712483B CN106712483B CN201710112576.0A CN201710112576A CN106712483B CN 106712483 B CN106712483 B CN 106712483B CN 201710112576 A CN201710112576 A CN 201710112576A CN 106712483 B CN106712483 B CN 106712483B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The present invention provides the guard method of a kind of circuit of synchronous rectification, charger and charger; circuit of synchronous rectification includes transformer, the rectification metal-oxide-semiconductor, detection circuit and the control module that connect with the output end of transformer, and whether detection circuit is abnormal for detecting rectification metal-oxide-semiconductor；Control module is connect with the detection circuit, if detecting that rectification metal-oxide-semiconductor is abnormal for detection circuit, turns down the output power of transformer, and then reduce the output electric current of charger.In this way, circuit of synchronous rectification provided by the invention, if synchronous rectification failure causes to rectify metal-oxide-semiconductor exception, circuit of synchronous rectification can turn down the output power of transformer, to reduce the output electric current of charger, to make the current reduction for rectifying metal-oxide-semiconductor, prevent rectification metal-oxide-semiconductor impaired.
Description
Technical field
The present invention relates to the protections of electronic technology field more particularly to a kind of circuit of synchronous rectification, charger and charger
Method.
Background technique
With the development of mobile communication technology, the mobile terminals such as mobile phone and tablet computer are more more and more universal, and mobile terminal is
As a part indispensable in people's daily life.Requirement of the people for mobile terminal is higher and higher, in addition to requiring to move
Dynamic terminal has outside use function abundant, also requires mobile terminal to can be realized quick charge and has enough continuation of the journey energy
Power.
Currently, using synchronous rectification by the secondary commutation to charger, the charge efficiency of charger can be improved, promoted
The speed of mobile terminal charging shortens user and charges the waiting time.But when synchronous rectification is broken down, secondary commutation is just
Common rectification mode can be returned to, electric current can be flowed through from the parasitic diode in the rectification metal-oxide-semiconductor of circuit of synchronous rectification, rectification
The loss meeting substantial increase of metal-oxide-semiconductor, may cause rectification metal-oxide-semiconductor damage, influences the normal use of charger.As it can be seen that at present
Charger there are problems that synchronous rectification failure cause rectify metal-oxide-semiconductor damage.
Summary of the invention
The embodiment of the present invention provides the guard method of a kind of circuit of synchronous rectification, charger and charger, current to solve
Charger there are problems that synchronous rectification failure cause rectify metal-oxide-semiconductor damage.
In a first aspect, being applied to charger, the synchronous rectification the embodiment of the invention provides a kind of circuit of synchronous rectification
Circuit includes transformer, the rectification metal-oxide-semiconductor, detection circuit and the control module that connect with the output end of the transformer, described
Whether detection circuit is abnormal for detecting the rectification metal-oxide-semiconductor；The control module is connect with the detection circuit, if being used for institute
It states detection circuit and detects that the rectification metal-oxide-semiconductor is abnormal, turn down the output power of the transformer, and then reduce the charger
Output electric current.
Second aspect, the embodiment of the present invention also provide a kind of charger, including above-mentioned circuit of synchronous rectification.
The third aspect, the embodiment of the present invention also provide a kind of guard method of charger, applied to being provided with synchronous rectification
The charger of circuit, the circuit of synchronous rectification includes transformer, the rectification metal-oxide-semiconductor that is connect with the output end of the transformer,
Detection circuit and control module, which comprises
Whether the detection circuit detects the rectification metal-oxide-semiconductor abnormal；
If the detection circuit detects that the rectification metal-oxide-semiconductor is abnormal, the control module turns down the defeated of the transformer
Power out, and then reduce the output electric current of the charger.
In this way, the circuit of synchronous rectification includes transformer, the output end company with the transformer in the embodiment of the present invention
Whether rectification metal-oxide-semiconductor, detection circuit and the control module connect, the detection circuit are abnormal for detecting the rectification metal-oxide-semiconductor；
The control module is connect with the detection circuit, if detecting that the rectification metal-oxide-semiconductor is abnormal for the detection circuit, is turned down
The output power of the transformer, and then reduce the output electric current of charger.In this way, if synchronous rectification failure causes to rectify
Metal-oxide-semiconductor is abnormal, and circuit of synchronous rectification can turn down the output power of transformer, to reduce the output electric current of charger, to make
The current reduction for rectifying metal-oxide-semiconductor prevents rectification metal-oxide-semiconductor impaired.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of circuit of synchronous rectification schematic diagram provided in an embodiment of the present invention；
Fig. 2 is another circuit of synchronous rectification schematic diagram provided in an embodiment of the present invention；
Fig. 3 is a kind of flow diagram of the guard method of charger provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It is a kind of circuit of synchronous rectification schematic diagram provided in an embodiment of the present invention referring to Fig. 1, Fig. 1, as shown in Figure 1, this is same
Walk rectification circuit and be applied to charger, including transformer 10 and the rectification metal-oxide-semiconductor 20 being connect with the output end of the transformer 10,
Whether detection circuit 30 and control module 40, the detection circuit 30 are abnormal for detecting the rectification metal-oxide-semiconductor 20；The control
Molding block 40 is connect with the detection circuit 30, if detecting that the rectification metal-oxide-semiconductor 20 is abnormal for the detection circuit 30, is adjusted
The output power of the low transformer 10, and then reduce the output electric current of charger.
In the embodiment of the present invention, if synchronous rectification is broken down, the exception for rectifying metal-oxide-semiconductor, detection circuit can be caused
30 can detecte the exception of rectification metal-oxide-semiconductor 20, and send abnormal signal to control module 40, and control module 40 can be according to connecing
The abnormal signal of receipts adjusts the duty ratio of the turn-on time of transformer 10, reduces the output power of transformer 10, to reduce charging
The output electric current of device, so as to when synchronous rectification is broken down, make to rectify the current reduction of metal-oxide-semiconductor 20, protection rectification MOS
Pipe 20 avoids rectification metal-oxide-semiconductor 20 from being damaged.
It should be noted that above-mentioned circuit of synchronous rectification further includes rectification control chip 50 and capacitor 60 etc., wherein whole
Flow control chip 50 is connect with the grid of rectification metal-oxide-semiconductor 20, can control the conducting and cut-off of rectification metal-oxide-semiconductor 20；Capacitor 60 is simultaneously
It is coupled between the vice-side winding and load of transformer 10, the pressure stabilizing of the output voltage to transformer 10 may be implemented.Certainly, above-mentioned
Circuit of synchronous rectification can also include other components, herein and without enumerating.In addition above-mentioned control module 40 can be with
It is the controller that arbitrarily may be implemented to turn down the output power of transformer 10.
Optionally, as shown in Fig. 2, detection circuit 30 may include controller 31, the terminal and control mould of controller 31
Block 40 connects, and the drain electrode of rectification metal-oxide-semiconductor 20 is connect with one end of the vice-side winding of transformer 10, and source electrode and load (not shown) connect
It connects, grid is connect with the another terminal of controller 31, and controller 31 is used to detect the driving letter of the grid output of rectification metal-oxide-semiconductor 20
Number.
In the embodiment of the present invention, if since above-mentioned circuit of synchronous rectification is in running order, when rectification metal-oxide-semiconductor 20 is normal
When, the grid of the rectification metal-oxide-semiconductor 20 can persistently have driving signal；When rectifying 20 exception of metal-oxide-semiconductor, the rectification metal-oxide-semiconductor 20
The driving signal of grid can have interruption.Therefore, controller 31 can detecte the grid of the rectification metal-oxide-semiconductor 20 within a preset time
Whether driving signal is not had, or the driving signal of detection has interruption, if so, determine that the rectification metal-oxide-semiconductor 20 is abnormal, control
Device 31 can send abnormal signal to control module 40, to turn down the output power of transformer 10, to reduce the defeated of charger
Electric current out.
Certainly, optionally, detection circuit may include thermistor (not shown), and thermistor is close to rectification metal-oxide-semiconductor 20
Setting, and thermistor is connect with control module 40, thermistor is used to detect the temperature of rectification metal-oxide-semiconductor 20.
Wherein, in the case where circuit of synchronous rectification is in running order, when rectification metal-oxide-semiconductor 20 occurs abnormal, metal-oxide-semiconductor 20 is rectified
Because substantial increase is lost, its temperature can be caused to rise, the thermistor close to its setting can detecte the rectification metal-oxide-semiconductor 20
Temperature change, when rectify metal-oxide-semiconductor 20 temperature exceed preset temperature value when, thermistor can send different to control module 40
Regular signal, wherein the abnormal signal can be specific currents or voltage signal, such as: abnormal signal is more than a certain threshold value
Electric current.
Optionally, circuit of synchronous rectification can also include sample resistance 70, and sample resistance 70 is series at transformer 10 and bears
Between load, and it is connect with control module 40.In this way, sample resistance 70 can feed back the output of charger to control module 40 in real time
Electric current makes control module 40 accurately adjust the output power of transformer 10, by the output current regulation of charger to default
Current value, to improve the reliability of the circuit of synchronous rectification.
Wherein, control module 40 can by the real-time output electric current of the acquisition charger of sample resistance 70, such as: can be with
The voltage at 70 both ends of sample resistance is obtained by the potentiometer (not shown) in parallel with sample resistance 70, and control module 40 obtains
The measured value of the potentiometer, control module 40 can be calculated according to the resistance value of the measured value and sample resistance 70 by
The real-time output electric current of sample resistance 70.
Optionally, circuit of synchronous rectification further includes control switch 80, and control switch 80 is located at the vice-side winding of transformer 10
It connects between load and with sample resistance 70, control switch 80 is connect with control module 40.Wherein, when event occurs in synchronous rectification
When barrier, rectification metal-oxide-semiconductor 20 may cause to damage since the electric current flowed through is excessive, control module 40 can control control switch 80 and
When disconnecting transformer 10 vice-side winding circuit, adjust charger output electric current be zero current, further avoid rectification MOS
Pipe 20 damages.
In this way, in the embodiment of the present invention, circuit of synchronous rectification includes transformer, the rectification that connect with the output end of transformer
Whether metal-oxide-semiconductor, detection circuit and control module, detection circuit are abnormal for detecting rectification metal-oxide-semiconductor；Control module and the inspection
Slowdown monitoring circuit connection turns down the output power of transformer, and then reduce and fill if detecting that rectification metal-oxide-semiconductor is abnormal for detection circuit
The output electric current of electric appliance.In this way, circuit of synchronous rectification can be turned down if synchronous rectification failure causes to rectify metal-oxide-semiconductor exception
The output power of transformer, to make the current reduction for rectifying metal-oxide-semiconductor, prevents rectification MOS to reduce the output electric current of charger
Pipe is impaired.
Based on above-mentioned circuit of synchronous rectification, the embodiment of the present invention also provides a kind of charging including above-mentioned circuit of synchronous rectification
Device.
Since the structure of charger body is the prior art, circuit of synchronous rectification has carried out specifically in the above-described embodiments
It is bright, therefore, the structure of specific electronic equipment is repeated no more in the present embodiment.
It is the flow diagram of the guard method of another charger provided in an embodiment of the present invention referring to Fig. 3, Fig. 3, answers
For including the charger for being provided with above-mentioned circuit of synchronous rectification, the circuit of synchronous rectification includes transformer 10 and transformer
Rectification metal-oxide-semiconductor 20, detection circuit 30 and the control module 40 of 10 output end connection, detection circuit 30 and control module 40 connect
It connects, as shown in figure 3, method includes the following steps:
Whether step 301, the detection rectification metal-oxide-semiconductor 20 of detection circuit 30 are abnormal.
It,, can be with if synchronous rectification is broken down in the case where circuit of synchronous rectification is in running order in the embodiment of the present invention
Cause the loss substantial increase for rectifying metal-oxide-semiconductor 20, makes to rectify 20 exception of metal-oxide-semiconductor, detection circuit 30 can detecte rectification MOS
The exception of pipe 20, and abnormal signal is sent to control module 40.
Optionally, detection circuit 30 detection rectification metal-oxide-semiconductor 20 whether Yi Chang step, may include:
Whether the grid of the detection rectification metal-oxide-semiconductor 20 of detection circuit 30 has driving signal, if the grid of rectification metal-oxide-semiconductor 20 does not have
Driving signal determines that rectification metal-oxide-semiconductor 20 is abnormal.
Wherein, since when rectification metal-oxide-semiconductor 20 is normal, the grid of the rectification metal-oxide-semiconductor 20 can persistently have driving signal；When
When rectifying 20 exception of metal-oxide-semiconductor, the driving signal of the grid of the rectification metal-oxide-semiconductor 20 can have interruption, and detection circuit 30 can detecte
Whether the grid of rectification metal-oxide-semiconductor 20 has driving signal, if can determine that rectification metal-oxide-semiconductor 20 is abnormal without driving signal.Example
Such as: controller 31 can be connected in the grid of rectification metal-oxide-semiconductor 20, detect whether rectification metal-oxide-semiconductor 20 has driving to believe by controller 31
Number, and abnormal signal is sent to control module 40.
Optionally, whether the detection of detection circuit 30 rectification metal-oxide-semiconductor 20 may include: in abnormal step
Whether the temperature of the detection rectification metal-oxide-semiconductor 20 of detection circuit 30 exceeds preset temperature value, if the temperature of rectification metal-oxide-semiconductor is super
The preset temperature value out determines that the rectification metal-oxide-semiconductor is abnormal.
Wherein, in the case where circuit of synchronous rectification is in running order, when rectification metal-oxide-semiconductor 20 occurs abnormal, metal-oxide-semiconductor 20 is rectified
Because substantial increase is lost, its temperature can be caused to rise, whether the temperature that detection circuit 30 can detecte rectification metal-oxide-semiconductor 20 exceeds
Preset temperature value can determine that rectification metal-oxide-semiconductor 20 is abnormal if exceeding preset temperature value.Such as: it can be close to rectification MOS
A thermistor is arranged in pipe 20, the temperature of rectification metal-oxide-semiconductor 20 is detected by thermistor, and when the temperature of rectification metal-oxide-semiconductor 20 is super
Out when preset temperature value, abnormal signal is sent to control module 40.
If step 302, detection circuit 30 detect that rectification metal-oxide-semiconductor 20 is abnormal, control module 40 turns down the defeated of transformer 10
Power out, and then reduce the output electric current of charger.
In the embodiment of the present invention, when control module 40 receives abnormal signal, the adjustable transformer of control module 40
The duty ratio of 10 turn-on times reduces the output voltage of transformer 10, to reduce the output power of transformer 10, and then drops
The output electric current of low charger, to make the current reduction for rectifying metal-oxide-semiconductor 20.
Such as: the normal maximum of circuit of synchronous rectification exports 5V/4A, and the conducting resistance of rectification metal-oxide-semiconductor 20 is 10m Ω, posts
The conducting voltage of raw diode is 0.7V.In the case of normal full load, the loss of rectification metal-oxide-semiconductor 20 is Pmos=4A × 4A × 10m
Ω=0.16W；When synchronous rectification occurs abnormal, Pmos=4A × 0.7V=2.8W.Therefore, when rectification metal-oxide-semiconductor 20 occurs abnormal
17.5 times when being normal of loss.If synchronous rectification is broken down, adjustable 10 output power of transformer makes charger
Output current reduction to 0.5A, the loss Pmos=0.5A*0.7V=0.35W of the metal-oxide-semiconductor 20 of rectification, to only be positive at this time
Normal 2 times, so as to avoid rectification metal-oxide-semiconductor 20 from damaging.
Optionally, the step of turning down the output electric current of charger may include:
The output electric current of charger is turned down to pre-set current value or zero current, wherein the pre-set current value is greater than zero.
Wherein, pre-set current value can be preset fixed value, be also possible to the output current value according to charger, by default rule
Then determining current value, is not limited thereto.
In this way, whether the detection circuit detects the rectification metal-oxide-semiconductor abnormal in the embodiment of the present invention；If the detection
Circuit detects that the rectification metal-oxide-semiconductor is abnormal, and the control module turns down the output power of the transformer, and then reduces charging
The output electric current of device.In this way, circuit of synchronous rectification can be adjusted if synchronous rectification failure causes to rectify metal-oxide-semiconductor exception
The output power of low transformer, to make the current reduction for rectifying metal-oxide-semiconductor, prevents from rectifying to reduce the output electric current of charger
Metal-oxide-semiconductor is impaired.More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any ripe
It knows those skilled in the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (5)
1. a kind of circuit of synchronous rectification, be applied to charger, the circuit of synchronous rectification include transformer and with the transformer
Output end connection rectification metal-oxide-semiconductor, which is characterized in that the circuit of synchronous rectification include further include detection circuit, sampling electricity
Whether resistance, control switch and control module, the detection circuit are abnormal for detecting the rectification metal-oxide-semiconductor；The sampling electricity
Resistance is series between the transformer and load；The control switch be located at the transformer vice-side winding and the load
Between and connect with the sample resistance, the control switch is connect with the control module；The control module and the detection
Circuit connection turns down the output power of the transformer if detecting that the rectification metal-oxide-semiconductor is abnormal for the detection circuit,
And then reduce the output electric current of the charger；
The detection circuit includes controller, and a terminal of the controller is connect with the control module, the rectification metal-oxide-semiconductor
Drain electrode connect with one end of the vice-side winding of the transformer, source electrode and load connect, and grid is another with the controller
Terminal connection, whether the grid that the controller is used to detect the rectification metal-oxide-semiconductor has driving signal, if the rectification metal-oxide-semiconductor
Grid there is no driving signal, determine that the rectification metal-oxide-semiconductor is abnormal.
2. circuit of synchronous rectification as described in claim 1, which is characterized in that the detection circuit includes thermistor, described
Thermistor is arranged close to the rectification metal-oxide-semiconductor, and the thermistor is connect with the control module, and the thermistor is used
In the temperature for detecting the rectification metal-oxide-semiconductor.
3. a kind of charger, which is characterized in that including the circuit of synchronous rectification as described in any one of claims 1 or 2.
4. a kind of guard method of charger, applied to the charger for being provided with circuit of synchronous rectification, the circuit of synchronous rectification
Including transformer and the rectification metal-oxide-semiconductor being connect with the output end of the transformer, which is characterized in that the circuit of synchronous rectification is also
Including detection circuit and control module, the detection circuit is connect with the control module, which comprises
Whether the detection circuit detects the rectification metal-oxide-semiconductor abnormal；
If the detection circuit detects that the rectification metal-oxide-semiconductor is abnormal, the control module turns down the output work of the transformer
Rate, and then by the output current reduction of the charger to pre-set current value or zero current, wherein the pre-set current value is big
In zero；
The detection circuit detect the rectification metal-oxide-semiconductor whether Yi Chang step, comprising:
Whether the grid that the detection circuit detects the rectification metal-oxide-semiconductor has driving signal, if the grid of the rectification metal-oxide-semiconductor does not have
There is driving signal, determines that the rectification metal-oxide-semiconductor is abnormal.
5. the guard method of charger as claimed in claim 4, which is characterized in that the detection circuit detects the rectification
Whether metal-oxide-semiconductor is in abnormal step, comprising:
Whether the temperature that the detection circuit detects the rectification metal-oxide-semiconductor exceeds preset temperature value, if the temperature of the rectification metal-oxide-semiconductor
Degree exceeds the preset temperature value, determines that the rectification metal-oxide-semiconductor is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710112576.0A CN106712483B (en) | 2017-02-28 | 2017-02-28 | A kind of guard method of circuit of synchronous rectification, charger and charger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710112576.0A CN106712483B (en) | 2017-02-28 | 2017-02-28 | A kind of guard method of circuit of synchronous rectification, charger and charger |
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| CN106712483A CN106712483A (en) | 2017-05-24 |
| CN106712483B true CN106712483B (en) | 2019-01-22 |
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| CN110429833A (en) * | 2019-08-13 | 2019-11-08 | 纽福克斯光电科技（上海）有限公司 | A kind of circuit of synchronous rectification of charger |
| CN111521952A (en) * | 2020-05-08 | 2020-08-11 | 红河学院 | Synchronous rectification circuit, charger and synchronous rectification circuit control method and system |
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| CN1333592A (en) * | 2000-07-07 | 2002-01-30 | 深圳市华为电气技术有限公司 | Counter exciting synchronous rectification DC/DC converter protector |
| US6975521B1 (en) * | 2001-07-18 | 2005-12-13 | Sony Corporation | Switching power supply apparatus |
| CN101527525A (en) * | 2009-04-08 | 2009-09-09 | 李成勇 | Synchronous rectification external drive proposal |
| CN105939122A (en) * | 2015-03-02 | 2016-09-14 | 富士电机株式会社 | Switching power supply device |
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|---|---|---|---|---|
| CN1333592A (en) * | 2000-07-07 | 2002-01-30 | 深圳市华为电气技术有限公司 | Counter exciting synchronous rectification DC/DC converter protector |
| US6975521B1 (en) * | 2001-07-18 | 2005-12-13 | Sony Corporation | Switching power supply apparatus |
| CN101527525A (en) * | 2009-04-08 | 2009-09-09 | 李成勇 | Synchronous rectification external drive proposal |
| CN105939122A (en) * | 2015-03-02 | 2016-09-14 | 富士电机株式会社 | Switching power supply device |
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| CN106712483A (en) | 2017-05-24 |
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Effective date of registration: 20171107 Address after: 283 No. 523860 Guangdong province Dongguan city Changan town usha BBK Avenue Applicant after: VIVO MOBILE COMMUNICATION CO., LTD. Applicant after: Wewo Mobile Communication Co. Ltd. Beijing branch Address before: 283 No. 523860 Guangdong province Dongguan city Changan town usha BBK Avenue Applicant before: VIVO MOBILE COMMUNICATION CO., LTD. |
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Effective date of registration: 20200525 Address after: 283 No. 523860 Guangdong province Dongguan city Changan town usha BBK Avenue Patentee after: VIVO MOBILE COMMUNICATION Co.,Ltd. Address before: 283 No. 523860 Guangdong province Dongguan city Changan town usha BBK Avenue Co-patentee before: Wewo Mobile Communication Co. Ltd. Beijing branch Patentee before: VIVO MOBILE COMMUNICATION Co.,Ltd. |
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