CN105353198A - Voltage detection circuit and speaker box - Google Patents
Voltage detection circuit and speaker box Download PDFInfo
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- CN105353198A CN105353198A CN201410410542.6A CN201410410542A CN105353198A CN 105353198 A CN105353198 A CN 105353198A CN 201410410542 A CN201410410542 A CN 201410410542A CN 105353198 A CN105353198 A CN 105353198A
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- 238000001514 detection method Methods 0.000 title abstract 3
- 238000002955 isolation Methods 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000006870 function Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The invention is applied to the field of speaker boxes, and provides a voltage detection circuit and a speaker box. The voltage detection circuit is externally connected to a blue-tooth chip, a power supply to be detected, a reference power supply, and a driving power supply; a voltage dividing circuit divides a power supply signal output by the power supply to be detected to obtain a first signal to be detected and outputs the first signal to be detected to an isolating amplifier circuit; the isolating amplifier circuit isolates and amplifies the first signal to be detected to obtain a second signal to be detected according to a reference power supply signal provided by the reference power supply and outputs the second signal to be detected to a driving circuit; the driving circuit adjusts the driving current of the driving power supply, output to a power supply pin of the blue-tooth chip, according to the second signal to be detected; and the blue-tooth chip calculates the voltage of the power supply to be detected according to the driving current. According to the invention, the voltage of the power supply of a speaker box power supply end can be detected in real time through the blue-tooth chip.
Description
Technical field
The invention belongs to audio amplifier field, particularly relate to voltage detecting circuit and audio amplifier.
Background technology
Audio amplifier is the necessary terminal of composition sound system, and it converts audio frequency electric energy to corresponding acoustic energy, and by this acoustic energy to space radiation.Existing audio amplifier not only has playing function, has also added memory function, radio function etc.Therefore, the power needed for existing audio amplifier is larger.
Especially, after Bluetooth technology is combined with audio amplifier, be born Baffle Box of Bluetooth.Particularly, Baffle Box of Bluetooth is built-in with Bluetooth chip, connects replace traditional wired connection with bluetooth, and then by being connected with the electronic equipment such as mobile phone, panel computer and notebook, to receive the voice data of electronic equipment transmission.Baffle Box of Bluetooth based on portable sound box, because of small and exquisite portable and paid attention to by consumer and receive; But along with the function of Baffle Box of Bluetooth increases, required voltage also increases, therefore need the supply voltage detecting Baffle Box of Bluetooth in real time, avoid the normal work affecting audio amplifier because of electric voltage exception.
Summary of the invention
The object of the present invention is to provide voltage detecting circuit and audio amplifier, to carry out real-time voltage detecting by Bluetooth chip to the power supply for audio amplifier feeder ear.
On the one hand, the invention provides a kind of voltage detecting circuit; The external Bluetooth chip of described voltage detecting circuit, power supply to be measured, reference power supply and driving power; Described voltage detecting circuit comprises the bleeder circuit, isolating amplifier circuit and the driving circuit that connect successively, and described driving circuit is also connected with the power pins of described Bluetooth chip;
Described bleeder circuit, carries out dividing potential drop for the power supply signal exported described power supply to be measured and obtains the first measured signal, and exporting described first measured signal to described isolating amplifier circuit;
Described isolating amplifier circuit, for the reference power supply signal provided according to described reference power supply, carries out isolation to described first measured signal and amplifies and obtain the second measured signal, and exports described second measured signal to described driving circuit;
Described driving circuit, for adjusting the drive current that described driving power exports to the power pins of described Bluetooth chip according to described second measured signal, calculates the voltage of described power supply to be measured according to described drive current with described Bluetooth chip.
On the one hand, the invention provides a kind of audio amplifier, described audio amplifier comprises Bluetooth chip, power supply to be measured, reference power supply and driving power, also comprises above-mentioned voltage detecting circuit.
Beneficial effect of the present invention: while being used for powering to audio amplifier by this power supply to be measured, by bleeder circuit, dividing potential drop is carried out to the power supply signal that power supply to be measured exports, carry out obtaining the second measured signal after isolation is amplified to the first measured signal of this dividing potential drop gained, and then described driving circuit, for following drive current that adjustment exports to the power pins of described Bluetooth chip according to described second measured signal to adjust the voltage in the power pins of described Bluetooth chip, described Bluetooth chip detects the voltage in its power pins, the voltage of the power supply signal that described power supply to be measured exports is calculated according to the voltmeter detected.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the composition structural drawing of the voltage detecting circuit that the embodiment of the present invention provides;
Fig. 2 is the physical circuit figure of the voltage detecting circuit that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In order to technical solutions according to the invention are described, be described below by specific embodiment.
Audio amplifier described in the embodiment of the present invention comprises Bluetooth chip, also comprises the power supply of powering for audio amplifier (i.e. power supply 5 to be measured).As an embodiment of this power supply 5 to be measured, described power supply to be measured 5 can be a joint or multiple batteries (preferably, this battery is lithium battery), if be multiple batteries, the multiple batteries of described power supply 5 to be measured can be (for improving the voltage of the power supply signal that described power supply 5 to be measured exports) of (for improving the electric current of the power supply signal that described power supply 5 to be measured exports) in parallel or series connection.As an embodiment of this power supply 5 to be measured, this power supply 5 to be measured is adapter, after at least carrying out the process such as EMI filtering, rectification, Voltage Cortrol, obtains the voltage needed for this audio amplifier by this adapter to civil power.
In embodiments of the present invention, the voltage due to this power supply 5 to be measured is that (such as, along with lithium battery continues to export the power supply of audio amplifier, the voltage of lithium battery can reduce in change; Again such as, the voltage that adapter exports is fluctuation).But because Bluetooth chip can only detect the voltage of below 4.5V, the embodiment of the present invention is by the voltage detecting of Bluetooth chip realization to this power supply 5 to be measured, with the addition of voltage detecting circuit, see Fig. 1.
Fig. 1 shows the composition structure of the voltage detecting circuit that the embodiment of the present invention provides, and for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
The voltage detecting circuit that the embodiment of the present invention provides, as shown in Figure 1, the external power supply 5 to be measured of described voltage detecting circuit, reference power supply 6 and driving power 7; Described voltage detecting circuit comprises: the bleeder circuit 1 connected successively, isolating amplifier circuit 3 and driving circuit 4.Described driving circuit 4 is also connected with the power pins of described Bluetooth chip.
For the bleeder circuit 1 that described voltage detecting circuit comprises, described bleeder circuit 1 for: the power supply signal that described power supply 5 to be measured exports is carried out to dividing potential drop and obtains the first measured signal, and exports described first measured signal to described isolating amplifier circuit 3.
In embodiments of the present invention, the voltage that the power supply signal exported due to power supply 5 to be measured has is excessive, is directly the voltage that cannot detect the power supply signal that power supply 5 to be measured exports by Bluetooth chip; Further, if directly detected the power supply signal of power supply 5 to be measured output by Bluetooth chip, this Bluetooth chip can directly be burnt.Therefore, the embodiment of the present invention adopts bleeder circuit 1 to carry out dividing potential drop in proportion to this power supply signal in advance, and the first measured signal that dividing potential drop is obtained is in below 4.5V, and then carries out voltage detecting by Bluetooth chip.
For the isolating amplifier circuit 3 that described voltage detecting circuit comprises, see Fig. 1, described isolating amplifier circuit 3 is for reference power supply 6 signal that provides according to described reference power supply 6, carry out isolation to described first measured signal amplify and obtain the second measured signal, and export described second measured signal to described driving circuit 4.
In embodiments of the present invention, Bluetooth chip is directly burnt because of the damage of bleeder circuit 1 for avoiding direct directly the power supply to Bluetooth chip by the first measured signal after dividing potential drop of power supply 5 to be measured, the embodiment of the present invention is also provided with isolating amplifier circuit 3, by this isolating amplifier circuit 3, signal isolation is carried out to described first measured signal, also impedance isolation is carried out to bleeder circuit 1 simultaneously, also voltage stabilizing amplification is carried out to the first measured signal simultaneously, the voltage that the maximum voltage of the second measured signal that this isolating amplifier circuit 3 is exported has for reference power supply 6 signal that described reference power supply 6 provides, further ensure the voltage that exports to Bluetooth chip lower than 4.5V.
For the driving circuit 4 that described voltage detecting circuit comprises, see Fig. 1, described driving circuit 4 for: adjust according to described second measured signal the drive current that described driving power 7 exports to the power pins of described Bluetooth chip, calculate the voltage of described power supply to be measured 5 with described Bluetooth chip according to described drive current.
In embodiments of the present invention, because the driving force of isolating amplifier circuit 3 is poor, cannot work by driven Bluetooth chip; Therefore, embodiments provide driving circuit 4, by this driving circuit 4 for Bluetooth chip is powered (namely to the power pins output drive signal of described Bluetooth chip).And meanwhile, with the current value of described second measured signal for benchmark, the electric current (i.e. drive current) that the drive singal of following described driving power 7 output of adjustment has
And then Bluetooth chip accesses this drive singal from its power pins, by this drive singal, this Bluetooth chip is worked on power.The Bluetooth chip worked on power carries out voltage detecting to its power pins; The voltage of the power supply signal exported by voltage and the described power supply to be measured 5 of voltage detecting gained due to Bluetooth chip has corresponding relation, therefore, voltage (for Bluetooth chip to carry out the voltage of voltage detecting gained to its power pins) by detecting gained determines the voltage of the power supply signal that described power supply to be measured 5 exports, realizes the real-time detection of the voltage of the power supply signal to described power supply 5 output to be measured.
As one embodiment of the invention, described driving circuit 4 comprises: the 3rd resistance and three end transistors for Current amplifier; The reference edge of described three end transistors, hot end and cold end correspondence connects the power pins of the second end of described 3rd resistance, described driving power 7 and described Bluetooth chip; Described three end transistors access described second measured signal from described reference edge, isolating amplifier circuit 3 described in the first termination of described 3rd resistance.
In the present embodiment, described driving circuit 4 adopts transistor (i.e. described three end transistors) to realize current following function; Particularly, follow described second measured signal by this transistor and adjust the drive current that described driving power 7 exports to the power pins of described Bluetooth chip, realize the adjustment to the voltage in the power pins of described Bluetooth chip.
As the present embodiment one preferred implementation, described three end transistors are N-type metal-oxide-semiconductor; The grid of described N-type metal-oxide-semiconductor, drain electrode and source electrode correspond to the reference edge of described three end transistors, hot end and cold end.
As the present embodiment one preferred implementation, described three end transistors are P type metal-oxide-semiconductor; The grid of described P type metal-oxide-semiconductor, drain electrode and source electrode correspond to the reference edge of described three end transistors, cold end and hot end.
Fig. 2 shows the physical circuit of the voltage detecting circuit that the embodiment of the present invention provides, and for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
As the present embodiment one preferred implementation, see Fig. 2, described three end transistors are NPN type triode Q1; The base stage of described NPN type triode Q1, collector and emitter correspond to the reference edge of described three end transistors, hot end and cold end.
As the present embodiment one preferred implementation, described three end transistors are PNP type triode; The base stage of described PNP type triode, collector and emitter correspond to the reference edge of described three end transistors, cold end and hot end.
As one embodiment of the invention, due to the voltage difference between the reference edge of described three end transistors and cold end, in order to avoid the impact of this voltage difference is to the measuring accuracy of the power supply signal that described power supply 5 to be measured exports, in described power sense circuit, be added with voltage compensating circuit 2;
For the voltage compensating circuit 2 that described voltage detecting circuit comprises, described voltage compensating circuit 2 is connected with described bleeder circuit 1; Particularly, described voltage compensating circuit 2 for: pre-compensation is carried out to the voltage difference between the reference edge of described three end transistors and cold end.
As the present embodiment one embodiment, see Fig. 2, described voltage compensating circuit 2 is made up of one or more Diode series.
Specifically in the present embodiment, described voltage compensating circuit 2 comprises one or more diode; If the number of the diode that described voltage compensating circuit 2 comprises is multiple, see Fig. 2, the plurality of diode is series connection, and between neighboring diode, it is the anode of a diode Dj after the negative electrode of last diode Di connects, the anode of first diode D1 connects described bleeder circuit 1, the plus earth of last diode Dn.
It should be noted that, the number of the diode that described voltage compensating circuit 2 comprises is fixed according to the voltage difference between the reference edge of described three end transistors and cold end, compensates the voltage difference between the reference edge of described three end transistors and cold end like this by described voltage compensating circuit 2.Such as, when described three end transistors adopt NPN type triode to realize, because the voltage difference between the base stage of NPN type triode and transmitter is 0.7V, in described voltage compensating circuit 2, the Diode series of two 0.35V connected therefore is selected to realize.
In an embodiment of the present invention, see Fig. 2, described bleeder circuit 1 has hot end, cold end and dividing potential drop output terminal, and described hot end, described cold end and described dividing potential drop output terminal correspondence connect described power supply to be measured 5, described voltage compensating circuit 2 and described isolating amplifier circuit 3;
Particularly, described bleeder circuit 1 comprises the first resistance R1 and the second resistance; The first end of the second resistance described in second termination of described first resistance R1, the first end of described first resistance R1 and the second end correspond to hot end and the dividing potential drop output terminal of described bleeder circuit 1, and the second end of described second resistance is the dividing potential drop output terminal of described bleeder circuit 1.
In embodiments of the present invention, the ratio of the maximum voltage value that has according to the power supply signal that described power supply 5 to be measured exports of the resistance ratio of the first resistance R1 and the second resistance R2 and preset voltage value (this preset voltage value is: artificially or experimentally data are from the magnitude of voltage chosen between 4V to 4.5V) is determined; Preferably, the first resistance R1 and the second resistance R2 all selects the resistance that resistance is larger.
Like this, by the first resistance R1 and the second resistance R2, dividing potential drop is carried out to the power supply signal that described power supply 5 to be measured exports, the voltage that described bleeder circuit 1 is exported from its dividing potential drop output terminal is less than or equal to this preset voltage value, described Bluetooth chip correctly can be detected and voltage (being less than or equal to described preset voltage value) in its power pins calculate the voltage of described power supply to be measured 5 according to the voltmeter in this power pins.
In an embodiment of the present invention, described isolating amplifier circuit 3 has input end, reference edge and output terminal, and described input end, described reference edge and described output terminal correspondence connect described bleeder circuit 1, described reference power supply 6 and described driving circuit 4;
Particularly, described isolating amplifier circuit 3 is an amplifier U1; The positive input pin of described amplifier U1 is the input end of described isolating amplifier circuit 3, the power pins of described amplifier U1 is the reference edge of described isolating amplifier circuit 3, the output pin of described amplifier U1 is the output terminal of described isolating amplifier circuit 3, and the reversed input pin of described amplifier U1 connects the output pin of described amplifier U1.
In the present embodiment, described amplifier U1 can adopt existing amplifier to realize, and does not therefore limit at this model of amplifier.
In a preferred embodiment, described reference power supply 6 and described driving power 7 are respectively the power supply of 5V.As the embodiment of the invention, described reference power supply 6 and described driving power 7 are same power supply; Preferably, after Voltage Cortrol and/or electric current adjustment are carried out to described power supply 5 to be measured, described reference power supply 6 and described driving power 7 is obtained respectively.
The embodiment of the present invention also provides a kind of audio amplifier, and described audio amplifier comprises Bluetooth chip, power supply to be measured 5, reference power supply 6 and driving power 7, also comprises above-mentioned voltage detecting circuit.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make some equivalent alternative or obvious modification without departing from the inventive concept of the premise; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by submitted to claims.
Claims (10)
1. a voltage detecting circuit; The external Bluetooth chip of described voltage detecting circuit, power supply to be measured, reference power supply and driving power; It is characterized in that, described voltage detecting circuit comprises the bleeder circuit, isolating amplifier circuit and the driving circuit that connect successively, and described driving circuit is also connected with the power pins of described Bluetooth chip;
Described bleeder circuit, carries out dividing potential drop for the power supply signal exported described power supply to be measured and obtains the first measured signal, and exporting described first measured signal to described isolating amplifier circuit;
Described isolating amplifier circuit, for the reference power supply signal provided according to described reference power supply, carries out isolation to described first measured signal and amplifies and obtain the second measured signal, and exports described second measured signal to described driving circuit;
Described driving circuit, for adjusting the drive current that described driving power exports to the power pins of described Bluetooth chip according to described second measured signal, calculates the voltage of described power supply to be measured according to described drive current with described Bluetooth chip.
2. voltage detecting circuit as claimed in claim 1, it is characterized in that, described driving circuit comprises: the 3rd resistance and three end transistors for Current amplifier; The reference edge of described three end transistors, hot end and cold end correspondence connects the power pins of the second end of described 3rd resistance, described driving power and described Bluetooth chip; Described three end transistors access described second measured signal from described reference edge, isolating amplifier circuit described in the first termination of described 3rd resistance.
3. voltage detecting circuit as claimed in claim 2, it is characterized in that, described three end transistors are N-type metal-oxide-semiconductor; The grid of described N-type metal-oxide-semiconductor, drain electrode and source electrode correspond to the reference edge of described three end transistors, hot end and cold end.
4. voltage detecting circuit as claimed in claim 2, it is characterized in that, described three end transistors are NPN type triode; The base stage of described NPN type triode, collector and emitter correspond to the reference edge of described three end transistors, hot end and cold end.
5. voltage detecting circuit as claimed in claim 2, it is characterized in that, described voltage detecting circuit also comprises voltage compensating circuit; Described voltage compensating circuit is connected with described bleeder circuit;
Described voltage compensating circuit, for carrying out pre-compensation to the voltage difference between the reference edge of described three end transistors and cold end.
6. voltage detecting circuit as claimed in claim 5, it is characterized in that, described bleeder circuit has hot end, cold end and dividing potential drop output terminal, and described hot end, described cold end and described dividing potential drop output terminal correspondence connect described power supply to be measured, described voltage compensating circuit and described isolating amplifier circuit;
Described bleeder circuit comprises the first resistance and the second resistance;
The first end of the second resistance described in second termination of described first resistance, the first end of described first resistance and the second end correspond to hot end and the dividing potential drop output terminal of described bleeder circuit, and the second end of described second resistance is the dividing potential drop output terminal of described bleeder circuit.
7. voltage detecting circuit as claimed in claim 5, it is characterized in that, described voltage compensating circuit is made up of one or more Diode series.
8. voltage detecting circuit as claimed in claim 1, it is characterized in that, described isolating amplifier circuit has input end, reference edge and output terminal, and described input end, described reference edge and described output terminal correspondence connect described bleeder circuit, described reference power supply and described driving circuit;
Described isolating amplifier circuit is an amplifier; The positive input pin of described amplifier is the input end of described isolating amplifier circuit, the power pins of described amplifier is the reference edge of described isolating amplifier circuit, the output pin of described amplifier is the output terminal of described isolating amplifier circuit, and the reversed input pin of described amplifier connects the output pin of described amplifier.
9. voltage detecting circuit as claimed in claim 1, it is characterized in that, described reference power supply and described driving power are respectively the power supply of 5V.
10. an audio amplifier, is characterized in that, described audio amplifier comprises Bluetooth chip, power supply to be measured, reference power supply and driving power, also comprises the voltage detecting circuit described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410410542.6A CN105353198B (en) | 2014-08-19 | 2014-08-19 | Voltage detecting circuit and speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410410542.6A CN105353198B (en) | 2014-08-19 | 2014-08-19 | Voltage detecting circuit and speaker |
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| Publication Number | Publication Date |
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| CN105353198A true CN105353198A (en) | 2016-02-24 |
| CN105353198B CN105353198B (en) | 2018-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410410542.6A Expired - Fee Related CN105353198B (en) | 2014-08-19 | 2014-08-19 | Voltage detecting circuit and speaker |
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| CN (1) | CN105353198B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108271099A (en) * | 2018-02-08 | 2018-07-10 | 许卫军 | A kind of wall type Bluetooth audio device and its circuit |
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| JPS62250704A (en) * | 1986-04-24 | 1987-10-31 | Fuji Electric Co Ltd | Drive method for insulating type voltage detector |
| CN202135278U (en) * | 2011-03-18 | 2012-02-01 | 杨本全 | Multifunctional bluetooth sound box |
| CN102820912A (en) * | 2012-08-01 | 2012-12-12 | 邹伟 | Method and system for displaying battery voltage or electric quantity of Bluetooth device on Bluetooth terminal |
| CN103139673A (en) * | 2013-02-04 | 2013-06-05 | 珠海雷克斯电子科技有限公司 | Bluetooth small loudspeaker box |
| CN202975143U (en) * | 2012-12-21 | 2013-06-05 | 常熟开关制造有限公司(原常熟开关厂） | Detection circuit of automatic change-over switch electric appliance |
| CN103344822A (en) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | Battery voltage monitoring circuit used for battery powered equipment |
| CN203658444U (en) * | 2013-12-30 | 2014-06-18 | 青岛歌尔声学科技有限公司 | Voltage detection circuit and Bluetooth device |
-
2014
- 2014-08-19 CN CN201410410542.6A patent/CN105353198B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62250704A (en) * | 1986-04-24 | 1987-10-31 | Fuji Electric Co Ltd | Drive method for insulating type voltage detector |
| CN202135278U (en) * | 2011-03-18 | 2012-02-01 | 杨本全 | Multifunctional bluetooth sound box |
| CN102820912A (en) * | 2012-08-01 | 2012-12-12 | 邹伟 | Method and system for displaying battery voltage or electric quantity of Bluetooth device on Bluetooth terminal |
| CN202975143U (en) * | 2012-12-21 | 2013-06-05 | 常熟开关制造有限公司(原常熟开关厂） | Detection circuit of automatic change-over switch electric appliance |
| CN103139673A (en) * | 2013-02-04 | 2013-06-05 | 珠海雷克斯电子科技有限公司 | Bluetooth small loudspeaker box |
| CN103344822A (en) * | 2013-06-26 | 2013-10-09 | 天津成科自动化工程技术有限公司 | Battery voltage monitoring circuit used for battery powered equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108271099A (en) * | 2018-02-08 | 2018-07-10 | 许卫军 | A kind of wall type Bluetooth audio device and its circuit |
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| CN105353198B (en) | 2018-05-29 |
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Address after: 518000 Guangdong city of Shenzhen province Baoan District Xixiang Street Hung Kai Yong bamboo science and Technology Park B building, third floor unit B Patentee after: SHENZHEN MEIDONG ACOUSTICS Co.,Ltd. Address before: Baoan District Xixiang street Shenzhen city Guangdong province 518000 Le Zhu Jiao Cun Yong Kai Hong bamboo science and Technology Park B building, third floor unit B Patentee before: SHENZHEN MEIDONG ACOUSTICS Co.,Ltd. |
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Granted publication date: 20180529 |