CN201623839U - Power amplifier - Google Patents
Power amplifier Download PDFInfo
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- CN201623839U CN201623839U CN2010200563225U CN201020056322U CN201623839U CN 201623839 U CN201623839 U CN 201623839U CN 2010200563225 U CN2010200563225 U CN 2010200563225U CN 201020056322 U CN201020056322 U CN 201020056322U CN 201623839 U CN201623839 U CN 201623839U
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Abstract
The utility model relates to a power amplifier, which is provided with a USB port. The power amplifier adjusts volume by using a touch sensor to sense touch signals and is provided with a volume display module, audio data can be received via the USB port and decoded to generate audio signals, the audio signals can also be received via an external audio input port, the power amplifier can be selected and switched between the two modes, a USB power supply module with a power storage module is used to supply power for the overall system, and the power amplifier has a standby control function. The power amplifier uses the USB port to supply power, does not occupy a power socket position, is simple in wire connection and operation and convenient in use by means of touch sensing to adjust volume, and has satisfied sound reproduction effect as the USB power supply module directly supplies power to an audio amplifier and the audio amplifier can not cause distortion. Besides, the power amplifier is simple in circuit structure, few in components and low in cost, then can be contracted integrally and bring convenience for users to carry.
Description
Technical field
The utility model relates to audio frequency apparatus, more particularly, relates to a kind of power amplifier by the USB port power supply.
Background technology
At present generally adopt external power supply and audio amplifier with the matching used audio-frequence player device of desktop computer, it need take the supply socket position and line is many, in a jumble.Moreover, can't not use under the situation of external power supply having, as cooperating notebook computer to use in mobile occasion.
In addition, it generally is to regulate volume potentiometer by the rotation adjusting knob to realize that the general volume of this mechanical type adjusting knob is bigger that the volume of existing audio-frequence player device is regulated, and operation sense is not so good as touch, and breaks down easily after using a period of time.
The utility model content
The technical problems to be solved in the utility model is, needs external power supply and uses rotation to regulate the defective that knob is regulated volume, be inconvenient to use at the above-mentioned audio-frequence player device of prior art, and a kind of power amplifier of powering by USB port is provided.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of power amplifier, it is characterized in that, comprise shell and be arranged on USB port, external audio input interface, touch sensor and audio output interface on the described shell; Be provided with prime processing module, power amplifier module, microprocessing unit and USB supply module in the described shell; Wherein, described USB supply module links to each other with described USB port with thinking each parts power supply in the described power amplifier; Described external audio input interface links to each other with described prime processing module; The input of described power amplifier module links to each other with the output of described prime processing module, output links to each other with described audio output interface; Described microprocessing unit comprises volume control module, after it receives the output signal of described touch sensor and it is handled, exports volume control signal to described prime processing module.
In power amplifier described in the utility model, described shell is provided with display unit, and described display unit links to each other with the volume of reception shows signal and shows volume with described microprocessing unit.
In power amplifier described in the utility model, also be provided with USB audio decoder module in the described shell, the input that its input links to each other with described USB port, output is connected to described prime processing module; Described prime processing module comprises and is used for the diverter switch switched between input of audio frequency externally and the input of USB audio frequency.
In power amplifier described in the utility model, described microprocessing unit comprises the Opportunity awaiting control for linear module, and its input links to each other with the output and the external audio input interface of described USB audio decoder module, output is connected to described prime processing module, power amplifier module and touch sensor.
In power amplifier described in the utility model, the volume that described shell surrounded is: 100-1000cm
3
Another technical scheme that its technical problem that solves the utility model adopts is: construct a kind of power amplifier, comprise shell and be arranged on USB port, touch sensor and audio output interface on the described shell; Be provided with USB audio decoder module, prime processing module, power amplifier module, microprocessing unit and USB supply module in the described shell; Wherein, described USB supply module links to each other with described USB port with thinking each parts power supply in the described power amplifier; The input that the input of described USB audio decoder module links to each other with described USB port, output is connected to described prime processing module; The input of described power amplifier module links to each other with the output of described prime processing module, output links to each other with described audio output interface; Described microprocessing unit comprises volume control module, after it receives the output signal of described touch sensor and it is handled, exports volume control signal to described prime processing module.
In the above-mentioned power amplifier of the utility model, described USB supply module comprises:
One is used to store part electric weight that described USB port provides and the electric weight memory module of exporting a direct current low pressure;
The charge management module that the described part electric weight of one control charges to described electric weight memory module;
One control is boosted described dc low-voltage and is obtained the DC-DC stepup transformer of a direct current high pressure;
Described part electric weight is extracted in a control and the voltage that described USB port provides connected with described high direct voltage thereby the energy distribution module of operating voltage is provided for load.
In power amplifier described in the utility model, described electric weight memory module is rechargeable battery or electric capacity.
Implement power amplifier of the present utility model, have following beneficial effect: by USB port power supply, do not take the supply socket position, line is simple; Use the touch sensible mode to regulate volume, operate simple and easy, easy to use.
Also be provided with the display module that is used to show current volume on the power amplifier shell of the present utility model, make things convenient for the user to check the current volume situation.
In an embodiment of the present utility model, USB audio decoder module can be set in the power amplifier, when using the USB port power supply, can also send in progress voice data in the computer to this USB audio decoder module by USB port, and need not with another root tone frequency channel wire audio signal to be sent to power amplifier again.
In another embodiment of the present utility model, also be provided with the Opportunity awaiting control for linear module in the power amplifier, do not having under the situation of audio signal input, the Opportunity awaiting control for linear module makes that other module/parts enter resting state in the power amplifier, therefore can save electric energy.
In another embodiment of the present utility model, power amplifier has adopted the USB supply module that has the electric weight memory module, in average power is 5～10 times that its instantaneous maximum power can reach average power in the USB power supply process of 2.5W, therefore use it directly audio frequency power amplifier to be powered, audio frequency power amplifier will can not produce distortion, and playback effect is satisfactory.In addition, because this USB supply module circuit structure is simple, device is few, cost is low, makes the volume of whole power amplifier to do very for a short time, makes things convenient for the user to carry.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the module frame chart according to the power amplifier of the utility model one embodiment;
Fig. 2 is the module frame chart according to the power amplifier of another embodiment of the utility model;
Fig. 3 A is the external structure (side) according to the power amplifier of the utility model one embodiment;
Fig. 3 B is the rearview of the power amplifier of Fig. 3 A illustrated embodiment;
Fig. 4 is the module frame chart of the USB supply module that adopted in the power amplifier of the present utility model;
Fig. 5 is the circuit theory diagrams of an embodiment of the USB supply module that adopted in the power amplifier of the present utility model.
Embodiment
Fig. 1 is the module frame chart according to the power amplifier of the utility model one embodiment.As shown in Figure 1, in first embodiment of power amplifier of the present utility model, comprise USB port 10, USB supply module 12, prime processing module 24, power amplifier module 26, external audio input interface 30, microprocessing unit (MCU) 40, touch sensor 50, first audio output interface 62 and second audio output interface 64, reach display module 66.Comprise volume control module 42 among the MCU 40.
Wherein, USB supply module 12 links to each other with USB port 10; External audio input interface 30 links to each other with prime processing module 24; The input of power amplifier module 26 links to each other with the output of prime processing module 24, output links to each other with second audio output interface 64 with first audio output interface 62; Touch sensor (50) and prime processing module (24) are connected to the corresponding I/O port of microprocessing unit 40 respectively.
In an embodiment of the present utility model, first audio output interface 62 is used to connect loudspeaker; Second audio output interface 64 is an earphone interface, is used to connect earphone.
In power amplifier of the present utility model, touch sensor 50 is used for volume to be regulated, be responsible for the touch-control on the sense power amplifier housing panel, and send the I/O port of its state information by MCU to volume control module 42, the information decision volume that the latter senses according to touch sensor 50, send volume control signal to the prime processing module, and drive display module 66 demonstration information volume.
In operating process, USB supply module 12 provides electric energy for each parts (as the parts except that outside audio input interface 30 in the frame of broken lines) in the power amplifier.The function and the feature of the USB supply module that is adopted in the power amplifier of the present utility model will be elaborated in conjunction with Fig. 4 and Fig. 5 in the back.After volume control module 42 in the microprocessing unit 40 received the output signal of touch sensors 50 and it is handled, the I/O port by MCU exported volume control signal 42a to prime processing module 24.After entering the prime processing module from the audio signal 30a of external audio input interface 30, the volume control signal that the prime processing module sends according to MCU carries out the prime signal and amplifies, and it is carried toward power amplifier module 26.26 pairs of signals of power amplifier module amplify, and the signal after will amplifying by first audio output interface 62 or second audio output interface 64 outputs to loudspeaker or earphone.
The volume shows signal 42b that display module 66 receives from MCU I/O port, and show the current volume situation.As another selection, also display module can be set in the power amplifier of the present utility model, only judge the size of volume by user's the sense of hearing.
Fig. 2 is the module frame chart according to the power amplifier of another embodiment of the utility model.As shown in Figure 2, in second embodiment of power amplifier of the present utility model, except comprising each module/parts shown in Figure 1, also comprise USB audio decoder module 22; Also comprise among the MCU 40 in Opportunity awaiting control for linear module 44, the prime processing module 24 in addition and also comprise diverter switch 24a.Wherein, the input that the input of USB audio decoder module 22 links to each other with USB port 10, output is connected to prime processing module 24.
In operating process, USB supply module 12 provides electric energy for each parts (as the parts except that outside audio input interface 30 in the frame of broken lines) in the power amplifier.After volume control module 42 in the microprocessing unit 40 received the output signal of touch sensors 50 and it is handled, the I/O port by MCU exported volume control signal 42a to prime processing module 24.
The input of the Opportunity awaiting control for linear module 44 among the MCU 40 links to each other with the output and the external audio input interface 30 of USB audio decoder module 22; Output is connected to described prime processing module 24, power amplifier module 26 and touch sensor 50.
Opportunity awaiting control for linear module 44 obtains detection signal 30b and 22b from USB audio decoder module 22 and external audio input interface 30 respectively by the I/O port of MCU 40, in order to judge USB audio decoder module 22 and external audio input interface 30 whether audio signal output is arranged.If find not have the audio signal input to surpass certain hour threshold values (for example 3 minutes), then the I/O port of Opportunity awaiting control for linear module 44 by MCU 40 sends sleeping/waking signal 44a and allows other modules (for example prime processing module 24, power amplifier module 26 and touch sensor 50) enter resting state in the system, plays energy-conservation effect.When the audio signal input was arranged again, Opportunity awaiting control for linear module 44 was responsible for the waken system module of dormancy by the I/O port transmission sleeping/waking signal 44a of MCU 40, makes it enter operating state.Sleeping/waking signal 44a can be high/low level signal, for example when output during high level signal, makes that other modules enter resting state system in, and during the output low level signal, interior other modules of waken system are to resume work state; Vice versa.
In power amplifier use of the present utility model, can send the audio signal of outside (as the audio frequency output of equipment such as CD Player, MP3) to the prime processing module by the external audio input interface.
As a kind of selection, power amplifier of the present utility model can also not be provided with the external audio input interface, only receive voice data, and USB audio decoder module is set, this voice data is decoded the back output audio signal to the prime processing module from USB port.In this case, the diverter switch in the prime processing module can be removed.
Fig. 3 A is the external structure (side) according to the power amplifier of the utility model one embodiment.As shown in Figure 3A, in the present embodiment, the shell 80 of power amplifier comprises cylindrical bottom portion 81 and the curved surface top that tilts, and the top is made of three curved surfaces 82,83 and 84, forms two steps.Touch sensor 50 is arranged on above the 3rd lower curved surface 84, on second curved surface 83 in the middle of display module 66 is arranged on, curved surface 83 forms a slope between the first and the 3rd curved surface 82 and 84, no matter make when power amplifier is arranged on the table top, be to overlook or face to see display module 66 and the information volume that shows thereof.
Fig. 3 B is the rearview of the power amplifier of Fig. 3 A illustrated embodiment.In the present embodiment, the rear portion of the shell 80 of power amplifier is provided with USB port 10, external audio input interface 30, first audio output interface 62 and second audio output interface 64.In the present embodiment, second audio output interface 64 is an earphone interface; First audio output interface 62 is audio amplifier (loudspeaker) interface, and it can be connected with the audio amplifier binding post on the pcb board.
Other modules, for example USB supply module 12, USB audio decoder module 22, prime processing module 24, power amplifier module 26,, 40 inside that are arranged on shell 80 of microprocessing unit (MCU).
In the present embodiment, the diameter of cylindrical bottom portion 81 is about 10cm, and overall height is 3cm, and volume is about 240cm
3
Fig. 3 A and Fig. 3 B are depicted as an embodiment of the shell 80 of the utility model power amplifier, and the utility model power amplifier is not limited to use the shell of this shape and the arrangement of functional module and interface thereof.For example, can be designed to cubical profile, display module is arranged on the front, and touch sensor is arranged on end face, and each interface can be arranged on side or back.Also can be designed to the cylinder of cross section, as cylindroid, six prisms etc. for other shapes.Can also be designed to pyramid shape, animals shaped, rag baby shape etc.No matter be designed to what shape, the volume that shell surrounded can design at 100-1000cm
3Between.For example, when shell has the base of cylindricality, the size of this base can be selected in following scope: floor space 60-100cm
2: height: 2-4cm, for example select floor space 80cm
2, high 2.5cm.Again for example, when shell comprises cylindrical bottom portion and spherical (or other Any shape) top, the size of its cylindrical bottom portion can design in following scope: diameter 8-10cm: height: 2-4cm, for example: diameter 9cm, high 3.5cm.In a word, the design of shell principle is to make its inside can hold a PCB circuit board that comprises each functional module of power amplifier at least.
When adopting USB port to be the audio frequency power amplifier power supply, USB port can provide the voltage of 5V, and maximum can provide the electric current of 500mA, and promptly continuous maximum rating can reach 2.5W.Because music signal, its variable power scope is bigger, and under rational distortion status, its instantaneous maximum power is about 5～10 times of average power.This specific character just proposes a difficult problem to USB port power supply: if the distortion that makes music signal in the reasonable scope, then maximum power can only be limited to 2.5W, but average power is just very little like this, promptly causes the volume deficiency; And if average power is set in 2.5W, then maximum power when output USB port can't provide enough electric currents moment, produces serious distortion.So, be subjected to the restriction of USB port power output, directly utilize the audio frequency power amplifier of USB port power supply, its playback effect can not be satisfactory.
For improving playback effect, power amplifier of the present utility model has adopted a kind of novel USB power supply technique, and it can realize all multi-functional integration and better tone quality performance in very little volume.
As shown in Figure 4, be the structure calcspar of the USB supply module 12 that adopted in the power amplifier of the present utility model.USB supply module 12 of the present utility model comprises: USB port 10, electric weight memory module 2, charge management module 3, DC-DC stepup transformer 4 and energy distribution module 5.
Electric weight memory module 2 is used to store the part electric weight that USB port 10 provides and exports a direct current low pressure.The described part electric weight of charge management module 3 controls charges to electric weight memory module 2.4 controls of DC-DC stepup transformer are boosted described dc low-voltage and are obtained a direct current high pressure.Thereby described part electric weight are extracted in energy distribution module 5 control and the voltage that USB port 10 provides connected with described high direct voltage provide operating voltage for load (audio frequency power amplifier).
Wherein, electric weight memory module 2 can be rechargeable battery, also can be electric capacity and other energy storage components and parts.
Charge management module 3 comprises first flow restricter that is constituted and the charging current of electric weight memory module 2 is limited by switching tube.
Thereby DC-DC stepup transformer 4 comprises described dc low-voltage is coupled and obtains the transformer of described high direct voltage.
The energy distribution module comprises second flow restricter that is constituted and the electric weight size of the described part electric weight that extracts is limited by switching tube.
As shown in Figure 5, be the circuit theory diagrams of an embodiment of the USB supply module that adopted in the power amplifier of the present utility model.In the present embodiment, electric weight memory module 2 is a rechargeable battery.
Below, will set forth in two kinds of situation:
First kind of situation: K switch 1 disconnects, and this moment, the direct voltage of the 5V that USB power supply 1 provides charged to rechargeable battery BT1 by charge management module 3.
Switching tube Q2 in the charge management module 3, switching tube Q4 and switching tube Q5 form first flow restricter, and preferably, switching tube Q2, switching tube Q4 and switching tube Q5 all adopt triode.First flow restricter limits the charging current of electric weight memory module 2, with charge-current limit at 500mA.
At this moment, energy distribution module 5, DC-DC stepup transformer 4 and audio frequency power amplifier all are in closed condition.
First kind of situation: K switch 1 closure, USB port 10 is chip IC 1 power supply by K switch 1, thereby starts DC-DC stepup transformer 4.Preferably, the model of chip IC 1 is LM3478.Drag down the base stage of switching tube Q5 during 4 runnings of DC-DC stepup transformer by capacitor C 12, resistance R 19, diode D3, capacitor C 6 and resistance R 13, thus charge closing administration module 3.
Rechargeable battery BT1 provides input voltage for DC-DC stepup transformer 4, DC-DC stepup transformer 4 is the voltage of transformer T1 secondary winding (the 5th, 6 pin) 15V with the voltage transformation of about 3.8V that rechargeable battery BT1 provides, its negative terminal (the 6th pin) is connected with the anode of USB port 10 by resistance R 11, the switching tube Q3 in the energy distribution module 5, constitute the series connection of two voltage sources, for audio-frequency power amplifier provides the voltage of 20V, the voltage of this 20V provides operating voltage for audio frequency power amplifier.
Second flow restricter that energy distribution module 5 is formed by switching tube Q1, switching tube Q3, second flow restricter limits the electric weight size of the part electric weight that extracts from USB port 10.In the present embodiment, the electric current of 500mA is extracted in 5 restrictions of energy distribution module from USB port 10, wherein, described part electric weight and DC-DC stepup transformer 4 that energy distribution module 5 extracts are carried the electric current of its demand together for audio frequency power amplifier, remaining electric current, gets up the margin of power for rechargeable battery BT1 charging by diode D2.
As seen, if the average power of audio frequency power amplifier is set in 2.5W, when moment, maximum power was exported, USB port 10 can provide enough electric currents.Use the instantaneous maximum power of this USB supply module can reach 5～10 times of average power.As seen, the available power output of USB supply module that the utility model adopted will can not be limited, and use it directly to the audio frequency power amplifier power supply, and audio frequency power amplifier will can not produce distortion, and playback effect is more satisfactory.
The above only is a preferred embodiment of the present utility model, not in order to restriction the utility model, all any modifications of being done in spirit of the present utility model and principle, is equal to and replaces or improvement etc., all should be included in the protection range of the present utility model.
Claims (10)
1. a power amplifier is characterized in that, comprises shell (80) and is arranged on USB port (10), external audio input interface (30), touch sensor (50) and audio output interface (62,64) on the described shell (80); Be provided with prime processing module (24), power amplifier module (26), microprocessing unit (40) and USB supply module (12) in the described shell (80); Wherein, described USB supply module (12) links to each other with described USB port (10) with thinking each parts power supply in the described power amplifier; Described external audio input interface (30) links to each other with described prime processing module (24); The input of described power amplifier module (26) links to each other with the output of described prime processing module (24), output links to each other with described audio output interface (62,64); Described microprocessing unit (40) comprises volume control module (42), after it receives the output signal of described touch sensor (50) and it is handled, exports volume control signal to described prime processing module (24).
2. power amplifier according to claim 1 is characterized in that, described shell (80) is provided with display unit (66), and described display unit (66) links to each other with the volume of reception shows signal with described microprocessing unit (40) and shows volume.
3. power amplifier according to claim 2, it is characterized in that, also be provided with USB audio decoder module (22) in the described shell (80), the input that its input links to each other with described USB port (10), output is connected to described prime processing module (24); Described prime processing module (24) comprises and is used for the diverter switch (24a) switched between input of audio frequency externally and the input of USB audio frequency.
4. power amplifier according to claim 3, it is characterized in that, described microprocessing unit (40) comprises Opportunity awaiting control for linear module (44), and its input links to each other with the output and the external audio input interface (30) of described USB audio decoder module (22), output is connected to described prime processing module (24), power amplifier module (26) and touch sensor (50).
5. according to each described power amplifier in the claim 1 to 4, it is characterized in that the volume that described shell (80) is surrounded is: 100-1000cm3.
6. according to each described power amplifier in the claim 1 to 4, it is characterized in that described USB supply module (12) comprising:
One is used to store part electric weight that described USB port (10) provides and the electric weight memory module (2) of exporting a direct current low pressure;
The charge management module (3) that the described part electric weight of one control charges to described electric weight memory module (2);
One control is boosted described dc low-voltage and is obtained the DC-DC stepup transformer (4) of a direct current high pressure;
One control extract described part electric weight and with described USB port (10) thus the voltage that provides connect with described high direct voltage the energy distribution module (5) of operating voltage be provided for load.
7. want 6 described power amplifiers according to right, it is characterized in that, described electric weight memory module (2) is rechargeable battery or electric capacity.
8. power amplifier according to claim 5 is characterized in that, described USB supply module (12) comprising:
One is used to store part electric weight that described USB port (10) provides and the electric weight memory module (2) of exporting a direct current low pressure;
The charge management module (3) that the described part electric weight of one control charges to described electric weight memory module (2);
One control is boosted described dc low-voltage and is obtained the DC-DC stepup transformer (4) of a direct current high pressure;
One control extract described part electric weight and with described USB port (10) thus the voltage that provides connect with described high direct voltage the energy distribution module (5) of operating voltage be provided for load.
9. a power amplifier is characterized in that, comprises shell (80) and is arranged on USB port (10), touch sensor (50) and audio output interface (62,64) on the described shell (80); Be provided with USB audio decoder module (22), prime processing module (24), power amplifier module (26), microprocessing unit (40) and USB supply module (12) in the described shell (80); Wherein, described USB supply module (12) links to each other with described USB port (10) with thinking each parts power supply in the described power amplifier; The input that the input of described USB audio decoder module (22) links to each other with described USB port (10), output is connected to described prime processing module (24); The input of described power amplifier module (26) links to each other with the output of described prime processing module (24), output links to each other with described audio output interface (62,64); Described microprocessing unit (40) comprises volume control module (42), after it receives the output signal of described touch sensor (50) and it is handled, exports volume control signal to described prime processing module (24).
10. power amplifier according to claim 9 is characterized in that, described USB supply module (12) comprising:
One is used to store part electric weight that described USB port (10) provides and the electric weight memory module (2) of exporting a direct current low pressure;
The charge management module (3) that the described part electric weight of one control charges to described electric weight memory module (2);
One control is boosted described dc low-voltage and is obtained the DC-DC stepup transformer (4) of a direct current high pressure;
One control extract described part electric weight and with described USB port (10) thus the voltage that provides connect with described high direct voltage the energy distribution module (5) of operating voltage be provided for load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200563225U CN201623839U (en) | 2010-01-06 | 2010-01-06 | Power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200563225U CN201623839U (en) | 2010-01-06 | 2010-01-06 | Power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201623839U true CN201623839U (en) | 2010-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200563225U Expired - Fee Related CN201623839U (en) | 2010-01-06 | 2010-01-06 | Power amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780401A (en) * | 2012-07-25 | 2012-11-14 | 深圳市茂宏电气有限公司 | Intelligent control circuit and intelligent control method of switch power supply efficiency |
| CN107681982A (en) * | 2011-06-23 | 2018-02-09 | 高通股份有限公司 | Method and apparatus for generating power source |
| WO2021044081A1 (en) * | 2019-09-04 | 2021-03-11 | Genelec Oy | Audio amplifier for use with a limited power source |
-
2010
- 2010-01-06 CN CN2010200563225U patent/CN201623839U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681982A (en) * | 2011-06-23 | 2018-02-09 | 高通股份有限公司 | Method and apparatus for generating power source |
| CN102780401A (en) * | 2012-07-25 | 2012-11-14 | 深圳市茂宏电气有限公司 | Intelligent control circuit and intelligent control method of switch power supply efficiency |
| CN102780401B (en) * | 2012-07-25 | 2015-05-20 | 深圳市茂宏电气有限公司 | Intelligent control circuit and intelligent control method of switch power supply efficiency |
| WO2021044081A1 (en) * | 2019-09-04 | 2021-03-11 | Genelec Oy | Audio amplifier for use with a limited power source |
| AU2020342796B2 (en) * | 2019-09-04 | 2023-11-09 | Genelec Oy | Audio amplifier for use with a limited power source |
| US11923810B2 (en) | 2019-09-04 | 2024-03-05 | Genelec Oy | Audio amplifier for use with a limited power source |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20180106 |
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| CF01 | Termination of patent right due to non-payment of annual fee |