CN105872889A - Mobile sound box control circuit and mobile sound box - Google Patents
Mobile sound box control circuit and mobile sound box Download PDFInfo
- Publication number
- CN105872889A CN105872889A CN201610193307.7A CN201610193307A CN105872889A CN 105872889 A CN105872889 A CN 105872889A CN 201610193307 A CN201610193307 A CN 201610193307A CN 105872889 A CN105872889 A CN 105872889A
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- module
- resistance
- voltage
- charging
- power
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention belongs to the field of sound boxes, and provides a mobile sound box control circuit and a mobile sound box. The mobile sound box control circuit includes a voltage conversion module, a master control module, a power amplification module, a play unit and a power module. A first direct current is connected to the voltage conversion module, and the voltage conversion module performs boost conversion on the first direct current and outputs a second direct current. The master control module respectively outputs a charging current and a third direct current from a charging end and a power output end according to the second direct current and a voltage of the charging end. The power module outputs a discharge current according to the second direct current or charges by using the charging current. Due to use of the voltage conversion module, the mobile sound box control circuit can use a higher charging voltage, thereby improving charging efficiency, reducing charging time, and improving use experience of a user.
Description
Technical field
The invention belongs to audio amplifier field, particularly to a kind of Mobile loudspeaker box control circuit and Mobile loudspeaker box.
Background technology
Mobile loudspeaker box (referring generally to Baffle Box of Bluetooth) refers to embedded with bluetooth chip, connects with bluetooth and replaces tradition wire rod connection
Stereo set, by being connected with bluetooth playback equipments such as mobile phone plane plate computer and notebooks, reach conveniently purpose.Mesh
Before, Baffle Box of Bluetooth is based on portable sound box, and profile is the smallest and the most exquisite portable, and Baffle Box of Bluetooth technology also facilitates the spy of people by it
Point is gradually paid attention to by consumer and receives, and the most common Baffle Box of Bluetooth mostly is monophonic audio amplifier (single speaker unit), the most also
Emerge in large numbers the sound-channel voice box (two or more speaker unit) that some tonequality are excellent.
Mobile loudspeaker box is typically from charged pool, it is possible to carry out the broadcasting of certain time, and long-time broadcasting can battery electric quantity deficiency
Need charging, but in charging process, general charging current is little, needs long-time process to charge, affect user and use, reduce and use
Family experience.
Summary of the invention
It is an object of the invention to provide a kind of Mobile loudspeaker box control circuit, it is intended to solve existing Mobile loudspeaker box charged electrical
Flow little, affect the problem that user uses.
The present invention is achieved in that a kind of Mobile loudspeaker box control circuit, including the broadcast unit interconnected and power
Amplification module, described Mobile loudspeaker box control circuit also includes:
Input accesses the first direct current, described first direct current carries out boost conversion and exports the second galvanic voltage and turn
Die change block；
Power end connects the output of described voltage transformation module, and power output end connects the power supply of described power amplifier module
End, and has charging end, according to the voltage of described second direct current and described charging end respectively from described charging end and described electricity
Source output terminal output charging current and the 3rd galvanic main control module；
Power end connects the charging end of described main control module, and power output end connects the power end of described power amplifier module, inspection
Survey end and connect the output of described voltage transformation module, export discharge current according to described second galvanic voltage or utilize institute
State the power module that charging current is charged.
Another object of the present invention also at Mobile loudspeaker box a kind of with offer, including housing, also includes above-mentioned Mobile loudspeaker box control
Circuit processed.
The present invention includes described voltage transformation module, described main control module, described power amplifier module, described by employing
Broadcast unit and the described Mobile loudspeaker box control circuit of described power module, accessed described first by described voltage transformation module
Direct current also carries out boost conversion and exports described second direct current described first direct current；By described main control module according to institute
State second direct current voltage with charging end respectively from charging end and power output end output described charging current and the described 3rd
Direct current；Exported described discharge current by described power module according to described second direct current or utilize described charging current to carry out
Charging.Owing to using described voltage transformation module so that described Mobile loudspeaker box control circuit can use higher charging voltage,
Promote charge efficiency, reduce the charging interval, promote user's experience.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the Mobile loudspeaker box control circuit that the embodiment of the present invention is provided；
Fig. 2 is the exemplary circuit structure of the power module that the embodiment of the present invention is provided；
Fig. 3 is the modular structure of the Mobile loudspeaker box control circuit that another embodiment of the present invention is provided；
Fig. 4 is the exemplary circuit structure of the voltage transformation module that another embodiment of the present invention is provided；
Fig. 5 is the exemplary circuit structure of the main control module that another embodiment of the present invention is provided.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the modular structure of the Mobile loudspeaker box control circuit that the embodiment of the present invention provided, for convenience of description,
Illustrate only and embodiment of the present invention relevant portion, details are as follows:
The Mobile loudspeaker box control circuit that the embodiment of the present invention is provided includes broadcast unit 400 and the power amplification mould interconnected
Block 300, also includes:
Input accesses the first direct current, the first direct current carries out boost conversion and exports the second galvanic voltage modulus of conversion
Block 100.
Power end connects the output of voltage transformation module 100, and power output end connects the power supply of power amplifier module 300
End, and has charging end, according to the voltage of the second direct current and charging end respectively from described charging end and described power output end
Output charging current and the 3rd galvanic main control module 200.
Power end connects the charging end of main control module 200, and power output end connects the power end of power amplifier module 300,
Test side connect described voltage transformation module 100 output, according to described second galvanic voltage output discharge current or
Utilize the power module 500 that described charging current is charged.
In embodiments of the present invention, the first DC voltage is less than the second DC voltage, it is preferable that the first direct current can
To be the voltage direct current as 5V, it can be accessed by the USB interface of computer or USB charger；Second direct current can be electricity
Pressure is the direct current of 9V；3rd direct current is after the drainage of main control module processes, and voltage is slightly smaller than the second direct current.Master control mould
Second direct current can not also be done any process by block, directly transfers out the second direct current.
In embodiments of the present invention, owing to increasing voltage transformation module 100 so that the first direct current that original voltage is the highest is permissible
Be converted to the direct current that voltage is higher, can be that power module 500 provides higher charging current.
Fig. 2 shows the exemplary circuit structure of the power module 500 that the embodiment of the present invention provided, for convenience of description,
Illustrate only and embodiment of the present invention relevant portion, details are as follows:
As one embodiment of the invention, power module 500 includes:
Batteries BAT, PMOS Q2 and resistance R11；
The positive pole of batteries BAT is the power end of power module 500, and the positive pole of batteries BAT connects the leakage of PMOS Q2
First end of pole, the grid of PMOS Q2 and resistance R11 connects the test side forming power module 500, the source electrode of PMOS Q2 altogether
Being the power output end of power module 500, the negative pole of batteries BAT is connected to ground altogether with second end of resistance R11.
In embodiments of the present invention, owing to having the charging current of high voltage, so whole Mobile loudspeaker box control circuit
Batteries BAT of relatively high charge voltage can also be equipped with, in order to provide bigger electric energy for power amplifier module 300, this storage
Battery pack BAT can be made up of two joint lithium storage batteries.
Fig. 3 shows the modular structure of the Mobile loudspeaker box control circuit that another embodiment of the present invention provided, for the ease of
Illustrating, illustrate only and embodiment of the present invention relevant portion, details are as follows:
In another embodiment of the invention, voltage transformation module 100 also has controlled end and the tested end of voltage, main control module
200 also include controlled end and the tested end of voltage；
Mobile loudspeaker box control circuit also includes, the first test side controls end with first and is connected the electricity of voltage transformation module 100 respectively
Press tested end and controlled end, the second test side to control end with second and be connected the tested end of voltage of main control module 200 respectively with controlled
End, respectively detection voltage transformation module 100 and the voltage condition of main control module 200, and divide according to voltage condition or user instruction
Not to the control module 600 of voltage transformation module 100 with main control module 200 output switching signal with charging signals.
In embodiments of the present invention, use control module 600 can monitor the working condition of Mobile loudspeaker box control circuit,
In the case of work occurs extremely, voltage conversion can be closed respectively by the first control end of control module 600, the second control end
Module 100 and main control module 200, it is to avoid damage other modules.
In embodiments of the present invention, control module 600 also has sending and receiving end, key assignments input, the 3rd control end；Mobile sound
Case control circuit also includes wireless communication module 800, key-press module 700 and power supply output module 900；Wireless communication module
The sending and receiving end of the sending and receiving end link control module 600 of 800, the key of the key assignments output link control module 600 of key-press module 700
Value input, the test side of power supply output module 900 connects the output of voltage transformation module 100, power supply output module 900
Power end connects the power output end of power module 500, the of the controlled end link control module 600 of power supply output module 900
Three control end.
In embodiments of the present invention, owing to have employed control module 600, Mobile loudspeaker box control circuit can increase other merits
Energy module so that it is have more multi-functional.Use key-press module 700 Mobile loudspeaker box control circuit can be carried out Artificial Control, adopt
Controlled in wireless and Wireless Data Transmission can be realized with wireless communication module 800, use power supply output module 900 moving
Audio amplifier control circuit is external out-put supply while using discharge current work.
Fig. 4 shows the exemplary circuit structure of the voltage transformation module 100 that another embodiment of the present invention provided, in order to just
In explanation, illustrate only and embodiment of the present invention relevant portion, details are as follows:
As one embodiment of the invention, voltage transformation module 100 includes:
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
Resistance R6, resistance R7, the first diode D1, the second diode D2, the 3rd diode D3, inductance L1, NPN triode Q1 and voltage
Conversion chip U1；
First end of electric capacity C1, first end of electric capacity C2, first end of electric capacity C3, the anode of the first diode D1, resistance R2
The input IN of the first end, first end of inductance L1 and voltage transformation chip U1 connects altogether and forms the defeated of voltage transformation module 100
Entering end, the negative electrode of the first diode D1 connects first end of resistance R1, and second end of resistance R1 is the electricity of voltage transformation module 100
Pressing tested end, second end of resistance R2, first end of resistance R5, the colelctor electrode of NPN triode Q1 are connected to voltage transformation chip altogether
Enable Pin EN of U1, first end of resistance R3 and first end of resistance R4 are connected to the base stage of NPN triode Q1, NPN triode altogether
Second end of the emitter stage of Q1, second end of resistance R4 and resistance R5 is connected to ground altogether, and second end of resistance R3 is voltage conversion
The controlled end of module 100, second end of inductance L1 and the anode of the second diode D2 are connected to the output of voltage transformation chip altogether
SW, the negative electrode of the second diode D2, first end of resistance R6, the anode of the 3rd diode D3 be connected to first end of electric capacity C4 altogether,
Second end of the feedback end FB and resistance R6 of voltage transformation chip U1 is connected to first end of resistance R7, the moon of the 3rd diode D3 altogether
First end of pole and electric capacity C5 connects the output forming voltage transformation module 100 altogether, the earth terminal GND of voltage transformation chip U1,
Second end of second end of resistance R7, second end of electric capacity C4 and electric capacity C5 is connected to ground altogether.
In embodiments of the present invention, voltage transformation chip U1 can be signal be the boost conversion core of MP1542 or MP1540
Sheet.
Fig. 5 shows the exemplary circuit structure of the main control module 200 that another embodiment of the present invention provided, for the ease of saying
Bright, illustrate only and embodiment of the present invention relevant portion, details are as follows:
As one embodiment of the invention, main control module 200 includes:
Electric capacity C6, electric capacity C7, resistance R8, resistance R9, resistance R10, the 4th diode D4, voltage-stabiliser tube D5 and charging management chip
U2；
First end of electric capacity C6, first end of electric capacity C7, the anode of the 4th diode D4, the anode of voltage-stabiliser tube D5, resistance R10
The input VIN of the first end and charging management chip U2 connects the power end forming main control module 200 altogether, the 4th diode D4's
Negative electrode connects first end of resistance R9, second end of resistance R9 and connects the electricity forming main control module 200 with first end of resistance R8 altogether
Pressing tested end, second end of resistance R8 and the earth terminal GND of charging management chip U2 are connected to ground altogether, second end of resistance R10 with
The charging controlled end GHG of charging management chip U2 connects the controlled end forming main control module 200, the charging of charging management chip U2 altogether
End BATT is the charging end of main control module 200, and the negative electrode of voltage-stabiliser tube D5 is the power output end of main control module 200.
The operation principle of the Mobile loudspeaker box control circuit embodiment of the present invention provided below in conjunction with Fig. 1 to Fig. 5 do into
One step explanation:
In the case of access the first direct current and voltage transformation module 100 are in opening with main control module 200, voltage
Conversion chip U1 accesses the first direct current by input IN, and exports the second direct current by output SW.Charge Management core
After the input VIN of sheet U2 receives the second direct current, by the power supply of charging end BATT output charging current to batteries BAT
End, and export the 3rd direct current by voltage-stabiliser tube D5.The charging end BATT of charging management chip U2 also monitors batteries simultaneously
The voltage condition of BAT power end, and then judge the charging complete situation of batteries BAT.Grid due to now PMOS Q2
Receiving from the second galvanic high level signal, PMOS Q2 is ended.Therefore, the most only main control module output the 3rd
Direct current provides operating current for power amplifier, and batteries does not export discharge current.
When the charging complete of batteries BAT, the charging end BATT of charging management chip U2 detects batteries power supply
The voltage of end reaches preset value, stops output charging current.
Do not access first galvanic in the case of, voltage transformation module 100 does not the most export the second direct current.Now
The grid of PMOS Q2 receives low level signal and turns on, and batteries BAT output discharge current is as power amplifier module
The operating current of 300.
The another object of the embodiment of the present invention also resides in a kind of Mobile loudspeaker box of offer.
The Mobile loudspeaker box that the embodiment of the present invention is provided includes housing, also includes above-mentioned Mobile loudspeaker box control circuit.
The embodiment of the present invention by employing include voltage transformation module 100, main control module 200, power amplifier module 300,
The Mobile loudspeaker box control circuit of broadcast unit 400 and power module 500, is accessed the first direct current by voltage transformation module 100
And the first direct current is carried out boost conversion and exports the second direct current；By main control module 200 according to the second direct current and charging
The voltage of end is respectively from charging end and power output end output charging current and the 3rd direct current；By power module 500 according to
Two direct currents export discharge currents or utilize charging current to be charged.Owing to using described voltage transformation module so that described
Mobile loudspeaker box control circuit can use higher charging voltage, promotes charge efficiency, reduces the charging interval, promotes user and uses
Experience.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (8)
1. a Mobile loudspeaker box control circuit, including the broadcast unit interconnected and power amplifier module, it is characterised in that institute
State Mobile loudspeaker box control circuit also to include:
Input accesses the first direct current, described first direct current carries out boost conversion and exports the second galvanic voltage and turn
Die change block；
Power end connects the output of described voltage transformation module, and power output end connects the power supply of described power amplifier module
End, and has charging end, according to the voltage of described second direct current and described charging end respectively from described charging end and described electricity
Source output terminal output charging current and the 3rd galvanic main control module；
Power end connects the charging end of described main control module, and power output end connects the power end of described power amplifier module, inspection
Survey end and connect the output of described voltage transformation module, export discharge current according to described second galvanic voltage or utilize institute
State the power module that charging current is charged.
2. Mobile loudspeaker box control circuit as claimed in claim 1, it is characterised in that described first DC voltage is less than described
Second DC voltage.
3. Mobile loudspeaker box control circuit as claimed in claim 1, it is characterised in that described power module includes being stored by two joint lithiums
The batteries of battery composition, and PMOS and resistance R11；
The positive pole of described batteries is the power end of described power module, and the positive pole of described batteries connects described PMOS
Drain electrode, first end of the grid of described PMOS and described resistance R11 connects the test side forming described power module altogether, described
The source electrode of PMOS is the power output end of described power module, the negative pole of described batteries and the second of described resistance R11
End is connected to ground altogether.
4. Mobile loudspeaker box control circuit as claimed in claim 1, it is characterised in that described voltage transformation module also has controlled
End and the tested end of voltage, described main control module also includes controlled end and the tested end of voltage；
Described Mobile loudspeaker box control circuit also includes, the first test side controls end with first and is connected described voltage transformation module respectively
The tested end of voltage and controlled end, the second test side control with second end be connected respectively the tested end of voltage of described main control module with
Controlled end, detects the voltage condition of described voltage transformation module and described main control module respectively, and according to described voltage condition or
User instruction is respectively to the control module of described voltage transformation module with described main control module output switching signal with charging signals.
5. Mobile loudspeaker box control circuit as claimed in claim 4, it is characterised in that described voltage transformation module includes:
Electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
Resistance R6, resistance R7, the first diode, the second diode, the 3rd diode, inductance L1, NPN triode and voltage transformation core
Sheet；
First end of described electric capacity C1, first end of described electric capacity C2, first end of described electric capacity C3, described first diode
The input of anode, first end of described resistance R2, first end of described inductance L1 and described voltage transformation chip connects shape altogether
Becoming the input of described voltage transformation module, the negative electrode of described first diode connects first end of described resistance R1, described electricity
Second end of resistance R1 is the tested end of voltage of described voltage transformation module, second end of described resistance R2, the of described resistance R5
One end, the colelctor electrode of described NPN triode are connected to the Enable Pin of described voltage transformation chip altogether, first end of described resistance R3 with
First end of described resistance R4 is connected to the base stage of described NPN triode altogether, the emitter stage of described NPN triode, described resistance R4
The second end and second end of described resistance R5 be connected to ground altogether, second end of described resistance R3 is described voltage transformation module
The anode of controlled end, second end of described inductance L1 and described second diode is connected to the output of described voltage transformation chip altogether
End, the negative electrode of described second diode, first end of described resistance R6, the anode of described 3rd diode are connected to described electric capacity altogether
First end of C4, the feedback end of described voltage transformation chip is connected to the first of described resistance R7 altogether with second end of described resistance R6
End, the negative electrode of described 3rd diode and first end of described electric capacity C5 connect the output forming described voltage transformation module altogether,
The earth terminal of described voltage transformation chip, second end of described resistance R7, second end of described electric capacity C4 and described electric capacity C5
The second end be connected to ground altogether.
6. Mobile loudspeaker box control circuit as claimed in claim 4, it is characterised in that described main control module includes:
Electric capacity C6, electric capacity C7, resistance R8, resistance R9, resistance R10, the 4th diode D4, voltage-stabiliser tube D5 and Charge Management core
Sheet；
First end of described electric capacity C6, first end of described electric capacity C7, the anode of described 4th diode, the sun of described voltage-stabiliser tube
The input of pole, first end of described resistance R10 and described charging management chip connects the power supply forming described main control module altogether
End, the negative electrode of described 4th diode connects the second end and the described resistance R8 of first end of described resistance R9, described resistance R9
The first end connect the tested end of voltage forming described main control module altogether, second end of described resistance R8 and described charging management chip
Earth terminal be connected to ground altogether, second end of described resistance R10 and the charging controlled end of described charging management chip meet formation institute altogether
Stating the controlled end of main control module, the charging end of described charging management chip is the charging end of described main control module, described voltage-stabiliser tube
Negative electrode be the power output end of described main control module.
7. Mobile loudspeaker box control circuit as claimed in claim 4, it is characterised in that described control module also have sending and receiving end,
Key assignments input, the 3rd control end；
Described Mobile loudspeaker box control circuit also includes wireless communication module, key-press module and power supply output module；
The sending and receiving end of described wireless communication module connects the sending and receiving end of described control module, the key assignments output of described key-press module
Connecting the key assignments input of described control module, the test side of described power supply output module connects the defeated of described voltage transformation module
Going out end, the power end of described power supply output module connects the power output end of described power module, described power supply output module
Controlled end connects the 3rd control end of described control module.
8. a Mobile loudspeaker box, including housing, it is characterised in that described Mobile loudspeaker box also includes such as any one of claim 1 to 7
Described Mobile loudspeaker box control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610193307.7A CN105872889A (en) | 2016-03-30 | 2016-03-30 | Mobile sound box control circuit and mobile sound box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610193307.7A CN105872889A (en) | 2016-03-30 | 2016-03-30 | Mobile sound box control circuit and mobile sound box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105872889A true CN105872889A (en) | 2016-08-17 |
Family
ID=56627562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610193307.7A Pending CN105872889A (en) | 2016-03-30 | 2016-03-30 | Mobile sound box control circuit and mobile sound box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105872889A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454623A (en) * | 2016-10-24 | 2017-02-22 | 深圳市赛音电子有限公司 | High-power loudspeaker box |
| CN111448738A (en) * | 2020-03-13 | 2020-07-24 | 广东高普达集团股份有限公司 | Multifunctional charging device and system |
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| JP2004349213A (en) * | 2003-05-26 | 2004-12-09 | Mitsubishi Electric Corp | Device and method for lighting high intensity discharge lamp |
| CN203407010U (en) * | 2013-08-19 | 2014-01-22 | 深圳市魅动音响有限公司 | Audio playing circuit and audio playing device |
| CN204441948U (en) * | 2015-02-13 | 2015-07-01 | 曾宪共 | A kind of power supply module |
| CN204632339U (en) * | 2015-02-09 | 2015-09-09 | 深圳市魅动音响有限公司 | A kind of high-power audio playing circuit and audio playing apparatus |
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2016
- 2016-03-30 CN CN201610193307.7A patent/CN105872889A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004349213A (en) * | 2003-05-26 | 2004-12-09 | Mitsubishi Electric Corp | Device and method for lighting high intensity discharge lamp |
| CN203407010U (en) * | 2013-08-19 | 2014-01-22 | 深圳市魅动音响有限公司 | Audio playing circuit and audio playing device |
| CN204632339U (en) * | 2015-02-09 | 2015-09-09 | 深圳市魅动音响有限公司 | A kind of high-power audio playing circuit and audio playing apparatus |
| CN204441948U (en) * | 2015-02-13 | 2015-07-01 | 曾宪共 | A kind of power supply module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454623A (en) * | 2016-10-24 | 2017-02-22 | 深圳市赛音电子有限公司 | High-power loudspeaker box |
| CN111448738A (en) * | 2020-03-13 | 2020-07-24 | 广东高普达集团股份有限公司 | Multifunctional charging device and system |
| CN111448738B (en) * | 2020-03-13 | 2023-03-24 | 广东高普达集团股份有限公司 | Multifunctional charging device and system |
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