CN102694506A - Audio-frequency amplifier system powered based on power supply of computer USB (Universal Serial Bus) power source and integration of USB audio card - Google Patents
Audio-frequency amplifier system powered based on power supply of computer USB (Universal Serial Bus) power source and integration of USB audio card Download PDFInfo
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- CN102694506A CN102694506A CN2012101836952A CN201210183695A CN102694506A CN 102694506 A CN102694506 A CN 102694506A CN 2012101836952 A CN2012101836952 A CN 2012101836952A CN 201210183695 A CN201210183695 A CN 201210183695A CN 102694506 A CN102694506 A CN 102694506A
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Abstract
The invention provides an audio-frequency amplifier system powered based on power supply of a computer USB (Universal Serial Bus) power source and integration of a USB audio card, comprising a detection protecting circuit, a DC/DC (Direct Current/Direct Current) power source, an audio-frequency amplifying circuit, a battery charging/discharging and overvoltage protection circuit, a transient energy storing capacitor, a USB audio card digital audio-frequency input circuit and a front-stage amplifying circuit; a USB power source input is respectively connected with the DC/DC power source and the battery charging/discharging and overvoltage protection circuit through the detection protecting circuit; the USB audio card digital audio-frequency input circuit is output to volume control through the front-stage amplifying circuit and an audio-frequency signal is output to the audio-frequency amplifying circuit through the volume control; an output end of the battery charging/discharging and overvoltage protection circuit supplies power to the audio-frequency amplifying circuit through the DC/DC power source; and meanwhile, the battery charging/discharging and overvoltage protection circuit is connected with a battery pack. The audio-frequency amplifier system disclosed by the invention can greatly prolong the continuous output time under the same power grade through increasing battery storage energy, and can greatly increase output power under the condition that the original transient output time is ensured.
Description
Technical field
The present invention relates to the sound equipment field, relate in particular to a kind of audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card.
Background technology
Along with USB interface popularizing in computer, the multimedia play equipment system is also more and more, particularly directly uses the output of USB sound card as power amplifier, with the replacement computer sound card.Because standard usb interface limits, the output voltage of its interface is+5V that electric current is 500mA to the maximum; Promptly the continuous limit power that can export of this interface is 2.5 watts, yet for music playing system, peak value (transient state) rated power of general music signal output and the ratio of its average output power are about 8:1; Shown in 1; The power source that can export 2.5W continuously can offer the peak power about the about maximum 20W of music playing system, how to satisfy such condition?
Existing solution adopts the DC-DC conversion with USB interface+5V power supply; Voltage is promoted to the voltage conditions about the output 20W of audio-frequency power amplifier system; And take the mode of capacitance energy storage; When the peak value of music signal, transient energy is provided, and USB passes through DC-DC to its makeup energy when the low valley of music signal.
Such scheme has solved the problem of the big transient peak power of USB mouth LVPS output; But because storage capacitor can not unrestrictedly strengthen; Therefore, continue high-power being restricted of output, during especially to the big music signal of intensity; The energy that is stored in the electric capacity will be exhausted by load very soon; But this moment, the energy in the storage capacitor also had little time to replenish, therefore overall output energy still by 2.5 watts of these input power limited in the very short time, so this scheme output transient power is about 20 watts of magnitudes.
Summary of the invention
The object of the present invention is to provide a kind of audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card; Through increasing battery energy storage; Let significantly prolong, and guarantee significantly to promote power output under the condition of original transient state output time with the continuous output time under the power rank.
The objective of the invention is to realize through following technical scheme.
A kind of audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card; Comprise: detect protective circuit, DC/DC power supply, audio amplifier circuit, battery charging and discharging and overvoltage crowbar, transient state storage capacitor, USB sound card DAB input circuit, preamplifying circuit; USB power supply input links to each other with DC/DC power supply and battery charging and discharging and overvoltage crowbar respectively through detecting protective circuit; USB sound card DAB input circuit outputs to volume control through preamplifying circuit; By volume control audio signal is input to audio amplifier circuit, battery charging and discharging and overvoltage crowbar output are supplied power to audio amplifier circuit, through the DC/DC power supply simultaneously; Battery charging and discharging and overvoltage crowbar connect battery pack, so that the battery charge energy storage to be provided.
Preferably; Said battery charging and discharging and overvoltage, low-voltage protection circuit are made up of integrated chip (U7), charge controlling chip (U5), discharge control chip (U6), battery pack, relay (J2), capacitor C 70 and resistance R 48, and electrical equipment (J2) coil power supply is succeeded in the output of USB power supply; Relay (J2) control end is through the 2nd pin of battery winding charge controlling chip (U5); The 5th pin of charge controlling chip (U5) links to each other with the 1st pin of integrated chip (U7), and discharge control chip (U6) the 4th pin links to each other with the 3rd pin of integrated chip (U7), shunt capacitance C70 and link to each other with the 2nd pin of charge controlling chip (U5) between the 6th pin of integrated chip (U7) and the 5th pin; The 2nd pin of integrated chip (U7) links to each other with discharge control chip (U6) the 6th pin through resistance R 48; The 5th pin of integrated chip (U7) connects power output end (VCC) through resistance R 49, and when USB connected with the mains, voltage was supplied power to relay; Relay (J2) adhesive; To the audio amplifier circuit power supply, guarantee has enough electric currents and voltage high-power and big when dynamic to cell voltage with the voltage of constant-current source.
Preferably; Said USB sound card DAB input circuit comprises integrated circuit (U2) crystal oscillator (Y1); Said preamplifying circuit comprises first amplifier (U3A), second amplifier (U3B), capacitor C 51 ~ C54; When USB inserts computer interface; Peripheral cell crystal oscillator (Y1) starting of oscillation of integrated circuit (U2), 15 pin of integrated circuit (U2) and 16 pin output simulated audio signals (L/R) branch are clipped to capacitor C 51, C52, amplify the back through the prime of C51 C52 coupling capacitance to the first amplifier (U3A), second amplifier (U3B) and are capacitively coupled to volume control by C53 C54.
Preferably; Said audio amplifier circuit comprises that integrated power amplifies chip (U4), capacitor C 71, C35; Volume control end is amplified chip (U4) the 6th, the 18th pin with analog signal (L/R) through C35, C71 coupling capacitance to integrated power, amplifies through integrated power and exports signal to loudspeaker plays after chip (U4) is handled.
Preferably; Said detection protective circuit and DC/DC power supply comprise: integrated chip (U1), resistance R 4, R5, metal-oxide-semiconductor Q2, Q3; Electronic transformer (T1), diode D1, D4, D5, computer USB power supply import through resettable fuse (F1), operating voltage are provided for integrated chip (U1) through diode D1; Simultaneously; The constant-current source that process is made up of triode Q1, R2, R3 offers the centre cap driving voltage of electronic transformer (T1), and electronic transformer work this moment goes out direct voltage through D4, the quick revovery diode rectification of D5 and amplifies chip (U4) power supply to integrated power; Simultaneously between dc voltage output end (VDD) and electronic transformer (T1) secondary centre cap, be parallel with transient state storage capacitor C3, and secondary centre cap ground connection.
Preferably, said triode Q1 is a transistor.
Preferably, said integrated chip (U1) is built-in oscillator+4.5V to+15V push-pull type current feed topology driver.
Preferably, said integrated chip (U1) adopts thermal-enhanced 8 pin μ MAX encapsulation, is operated in-40 ° of C to+125 ° of C temperature ranges.
The present invention compared with prior art; Beneficial effect is: the audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card provided by the invention; Existing energy-storage units is made into the mode of battery and electric capacity combination by single electric capacity; Through increasing battery energy storage, let significantly prolong, and guarantee significantly to promote power output under the condition of original transient state output time with the continuous output time under the power rank.
Description of drawings
Fig. 1 is the graph of a relation of power, power supply, music peak power and average musical power.
Fig. 2 is an audio-frequency amplifier system theory diagram of the present invention.
Fig. 3 is a USB sound card DAB input circuit schematic diagram.
Fig. 4 is the preamplifying circuit schematic diagram.
Fig. 5 is the audio amplifier circuit schematic diagram.
Fig. 6 detects protective circuit and DC/DC power principle figure for the power supply input.
Fig. 7 is battery charging and discharging and overvoltage, low-voltage protection circuit schematic diagram.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
See also shown in Figure 2; Audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card provided by the invention; Comprise: detect protective circuit 1, DC/DC power supply 2, audio amplifier circuit 3, battery charging and discharging and overvoltage crowbar 4, transient state storage capacitor 5, USB sound card DAB input circuit 6, preamplifying circuit 7; USB power supply input links to each other with DC/DC power supply 2 and battery charging and discharging and overvoltage crowbar 4 respectively through detecting protective circuit 1; 3 power supplies of DC/DC power supply 2 output termination audio amplifier circuits, USB sound card DAB input circuit 6 outputs to volume control through preamplifying circuit 7, by volume control audio signal is input to audio amplifier circuit 6; Battery charging and discharging and overvoltage crowbar 4 outputs are given audio amplifier circuit 3 through 2 power supplies of DC/DC power supply; Simultaneously, battery charging and discharging and overvoltage crowbar 4 connect battery pack, so that the battery charge energy storage to be provided.
Because output of the transient state of music signal itself and average output power ratio are at 8:1 even lower; It is free time that the while music signal has a lot of times; Therefore USB interface energy most of the time of providing is a battery charge; Satisfying the high dynamic need of high-power long period, when the provisional transient state output of needs, energy is provided through electric capacity, auxiliary by battery during the transient state peak power output continuously to provide output bigger energy.
Among the present invention, the USB sound card is the audio data stream that directly reads on the computer, thereby reduces the loss of audio data stream, adopts the power supply of USB power supply simultaneously, can directly save external power supply, reduces cost; And adopt the USB sound card also to save being connected of holding wire and computer, overcome factors such as the low and tonequality of the power of traditional multimedia sound equipment is bad.
See also Fig. 3, shown in 4; USB sound card DAB input circuit 6 is made up of the U2 integrated circuit; When USB inserts computer interface, shielding computer sound card, peripheral cell crystal oscillator (Y1) starting of oscillation of U2; U2 has the maximum sample rate of 16 precision and 48KHz, and to have ADC and the dynamic range that dynamic range is 89dB (representative value) be the DAC of 93dB (representative value).The built-in defencive function that prevents illegal copies (SCMS) of U2, and with the 12MHz sheet on the clock generator full duplex compatible.Be clipped to capacitor C 51, C52 from 15 pin and 16 pin output simulated audio signals (L/R) branch of U2, amplify the back through C51 C52 coupling capacitance to the prime of U3A, U3B and be capacitively coupled to volume control by C53 C54.
See also shown in Figure 5, volume control end with analog signal (L/R) through C35, C71 coupling capacitance to audio amplifier circuit U4 the 6th, the 18th pin, handle back output signal through U4 and arrive loudspeaker plays.U4 is that integrated power amplifies chip IC, and power amplifier sound is better, and high frequency is penetrating, and parsing power improves many, and low frequency more has dynamics.Complete noise made in coughing or vomiting clatter sound suppresses circuit can effectively be reduced and turn-off and pick-up noise and output noise when quiet.Excellent clamper recovery characteristics has been eliminated the audible noise that produces when the D class A amplifier A is pseudo-to be transshipped, and also has the reliable work that heat protection and short-circuit protection have guaranteed chip.
See also shown in Figure 6; 5V/500mA is through resettable fuse F1 for the input of computer USB power supply; Operating voltage is provided for the U1 chip through diode D1, simultaneously, offers the centre cap driving voltage of electronic transformer T1 through the constant-current source of forming by Q1, R2, R3.Electronic transformer work this moment goes out direct voltage through D4, the quick revovery diode rectification of D5 and amplifies IC (U4) power supply to audio frequency.Simultaneously between dc voltage output end VDD and electronic transformer T1 secondary centre cap, be parallel with transient state storage capacitor C3, and secondary centre cap ground connection.
Above-mentioned U1 is a built-in oscillator+4.5V to+15V push-pull type current feed topology driver subsystem, is applicable to the telco module power supply.This device can drive two MOSFET that link to each other with the former limit of centre-tapped transformer, and the negative voltage or the positive voltage of isolation is provided for secondary.The accurate oscillator of this device inside integrated programmable has synchronised clock output, can be used for synchronous outside pwm modulator.Through single non-essential resistance programming the internal oscillator frequency is set, scope is 50kHz to 1.5MHz.It is two mosfet drivers of 50% for ± 3A and duty ratio that U1 inside is integrated with peak drive current.It is the outside n channel mosfet of reference that this mosfet driver generation complementary signal drives with ground.The ratio of U1 clock output frequency and mosfet driver frequency has 1 times, 2 times and 4 times three kinds.U1 adopts thermal-enhanced 8 pin μ MAX encapsulation, is operated in-40 ° of C to+125 ° of C temperature ranges.U1 key characteristic: 1. current feed, push-pull driver subsystem.2. internal oscillator able to programme, accurate.3.+4.5V is to+15V single supply.4. two-way ± 3A gate driving output.5. under the 250kHz frequency, and when not having capacitive load, operating current is 1mA.6. the synchronised clock frequency is selected.7. thermal-enhanced 8 pin μ MAXL encapsulation.8. operating temperature range is that-40 ° of C are to+125 ° of C.
Above-mentioned constant-current source is a kind of circuit that constant current can be provided to load; It both can be for various amplifying circuits provide bias current to stablize its quiescent point, again can be as its active load, so that multiplication factor to be provided; And at differential amplifier circuit, pulse-generating circuit has obtained using widely.Yet various constant-current circuits are contrasted, analyze application characteristic separately, can be divided three classes, 1. transistor constant current source.2. FET constant-current source.3. integrated transporting discharging constant-current source, the present invention has adopted first kind, i.e. transistor constant current source.
Above-mentioned resettable fuse F1 is the power supply system that the front occurs damaging unusually because of the back circuit in order to protect.
See also shown in Figure 7; Battery charging and discharging of the present invention and overvoltage, low-voltage protection circuit are made up of integrated chip (U7), charge controlling chip (U5), discharge control chip (U6), battery pack, relay (J2), capacitor C 70 and resistance R 48, and electrical equipment (J2) coil power supply is succeeded in the output of USB power supply; Relay (J2) control end is through the 2nd pin of battery winding charge controlling chip (U5); The 5th pin of charge controlling chip (U5) links to each other with the 1st pin of integrated chip (U7), and discharge control chip (U6) the 4th pin links to each other with the 3rd pin of integrated chip (U7), shunt capacitance C70 and link to each other with the 2nd pin of charge controlling chip (U5) between the 6th pin of integrated chip (U7) and the 5th pin; The 2nd pin of integrated chip (U7) links to each other with discharge control chip (U6) the 6th pin through resistance R 48; The 5th pin of integrated chip (U7) connects power output end (VCC) through resistance R 49, and when USB connected with the mains, voltage was supplied power to relay; Relay (J2) adhesive; To the audio amplifier circuit power supply, guarantee has enough electric currents and voltage high-power and big when dynamic to cell voltage with the voltage of constant-current source.
U7 is overcharging and the over circuit of a high-precision single-unit chargeable lithium cell, and it integrates performances such as high accuracy overvoltage charge protection, overcurrent charge protection, overvoltage discharge prevention, overcurrent discharge prevention.Under the normal condition; The 5th pin vdd terminal voltage of U7 is between overvoltage charge protection threshold value (VOC) and overvoltage discharge prevention threshold value (VOD); And its 6th pin VSS test side voltage is between overcurrent charge protection threshold value (COUT) and overcurrent discharge prevention threshold value (VOUT); This moment, COUT end and the DOUT end of U7 were all exported high level, made external charge control U5 and discharge control U6 work conducting respectively.At this moment, both can use charger, also can make battery discharge through load to battery charge.U7 overcharges/discharge prevention through detecting VDD or VSS terminal voltage.COUT/DOUT becomes low level by high level when the charge/discharge protective condition takes place, and Q1/Q2 is become by conducting end, thereby the charge/discharge process stops.U7 has corresponding recovery condition to every kind of guard mode, and after the recovery condition satisfied, COUT/DOUT became high level by low level, makes U5/U6 become conducting by ending, thereby gets into normal condition.U7 is provided with certain time of delay to every kind of protection/recovery condition, only after protection/recovery condition lasts till the corresponding time, just carries out corresponding protection/recovery.If protection/recovery condition was eliminated in corresponding time of delay in the past, then do not get into and protect/return to form.For music, when music stops, power amplifier is hardly during consumed energy; The charging control section branch will charge with the fastest charging modes most extraneous intake to rechargeable battery; When musical power is exported, but power is also less than the energy that obtains from the external world, and charging control circuit is stored in energy remaining in the rechargeable battery equally; Arrive as transient peak power; And in the 100mS that the duration of transient peak power can bear in the transient energy storage unit, the battery pack of this moment can not participated in energy supplement work equally, under above three kinds of conditions; Always in stored energy (charging), it is just can stop that the energy of storing up to rechargeable battery reaches capacity limit to rechargeable battery through charging control circuit; The release of energy (discharge) also is intelligent, starts threshold level (V through a discharge is set
STATE) and two discharges close threshold values (V
STOP_L, V
STOP_H), in case that is to say when the supply power voltage of power amplifier reduces because of the increase of the power of output, battery discharge is not just to participate in replenishing of energy immediately, its intervention is to detect amplifier power supply in the discharge administrative unit to have dropped into V
STATEThe time, battery pack is just replenished the energy of power amplifier consumption, and the threshold values that stops to discharge then depends on V
STOP_LAnd V
STOP_H, V wherein
STOP_HBe the threshold level after amplifier power supply voltage gos up, V
STOP_LIt then is the lowest limit threshold values of battery pack continuous discharge.This circuit has also added the hardware protection battery, even break off the USB power supply, the electric weight of battery also is to be kept at full state; When USB connected with the mains ,+5V voltage was supplied power to relay, the J2 adhesive; Cell voltage is given the power supply of electronic transformer T1 centre cap with the voltage of constant-current source, and guaranteeing has enough electric currents and voltage to guarantee the steady operation of T1 high-power and big when dynamic; The not enough sound of electric current and phenomenons such as pause have been guaranteed when big dynamic output.When extracting USB, relay J 2 trippings have guaranteed that battery is in full state under the situation of outage, and can not discharge automatically.So also help to promote the performance and the life-span of battery charging and discharging in the native system, the transient energy storage element also is the power filtering capacitor of power conversion output and power amplifier unit usually, improves power supply ripple.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. one kind based on the computer USB power supply power supply audio-frequency amplifier system with the integration of USB sound card; It is characterized in that; Comprise: detect protective circuit, DC/DC power supply, audio amplifier circuit, battery charging and discharging and overvoltage crowbar, transient state storage capacitor, USB sound card DAB input circuit, preamplifying circuit; USB power supply input links to each other with DC/DC power supply and battery charging and discharging and overvoltage crowbar respectively through detecting protective circuit, and USB sound card DAB input circuit outputs to volume control through preamplifying circuit, is controlled by volume audio signal is input to audio amplifier circuit; Battery charging and discharging and overvoltage crowbar output are supplied power to audio amplifier circuit through the DC/DC power supply; Simultaneously, battery charging and discharging and overvoltage crowbar connect battery pack, so that the battery charge energy storage to be provided.
2. the audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card as claimed in claim 1; It is characterized in that; Said battery charging and discharging and overvoltage, low-voltage protection circuit are made up of integrated chip (U7), charge controlling chip (U5), discharge control chip (U6), battery pack, relay (J2), capacitor C 70 and resistance R 48, and electrical equipment (J2) coil power supply is succeeded in the output of USB power supply; Relay (J2) control end is through the 2nd pin of battery winding charge controlling chip (U5); The 5th pin of charge controlling chip (U5) links to each other with the 1st pin of integrated chip (U7), and discharge control chip (U6) the 4th pin links to each other with the 3rd pin of integrated chip (U7), shunt capacitance C70 and link to each other with the 2nd pin of charge controlling chip (U5) between the 6th pin of integrated chip (U7) and the 5th pin; The 2nd pin of integrated chip (U7) links to each other with discharge control chip (U6) the 6th pin through resistance R 48; The 5th pin of integrated chip (U7) connects power output end (VCC) through resistance R 49, and when USB connected with the mains, voltage was supplied power to relay; Relay (J2) adhesive; To the audio amplifier circuit power supply, guarantee has enough electric currents and voltage high-power and big when dynamic to cell voltage with the voltage of constant-current source.
3. the audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card as claimed in claim 2; It is characterized in that; Said USB sound card DAB input circuit comprises integrated circuit (U2) crystal oscillator (Y1); Said preamplifying circuit comprises first amplifier (U3A), second amplifier (U3B), capacitor C 51 ~ C54; When USB inserts computer interface; Peripheral cell crystal oscillator (Y1) starting of oscillation of integrated circuit (U2), 15 pin of integrated circuit (U2) and 16 pin output simulated audio signals (L/R) branch are clipped to capacitor C 51, C52, amplify the back through the prime of C51, C52 coupling capacitance to the first amplifier (U3A), second amplifier (U3B) and are capacitively coupled to volume control by C53, C54.
4. the audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card as claimed in claim 3; It is characterized in that; Said audio amplifier circuit comprises that integrated power amplifies chip (U4), capacitor C 71, C35; Volume control end is amplified chip (U4) the 6th, the 18th pin with analog signal (L/R) through C35, C71 coupling capacitance to integrated power, amplifies through integrated power and exports signal to loudspeaker plays after chip (U4) is handled.
5. the audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card as claimed in claim 4; It is characterized in that; Said detection protective circuit and DC/DC power supply comprise: integrated chip (U1), resistance R 4, R5, metal-oxide-semiconductor Q2, Q3; Electronic transformer (T1), diode D1, D4, D5, computer USB power supply import through resettable fuse (F1), operating voltage are provided for integrated chip (U1) through diode D1; Simultaneously; The constant-current source that process is made up of triode Q1, R2, R3 offers the centre cap driving voltage of electronic transformer (T1), and electronic transformer work this moment goes out direct voltage through D4, the quick revovery diode rectification of D5 and amplifies chip (U4) power supply to integrated power; Simultaneously between dc voltage output end (VDD) and electronic transformer (T1) secondary centre cap, be parallel with transient state storage capacitor C3, and secondary centre cap ground connection.
6. the audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card as claimed in claim 5 is characterized in that said triode Q1 is a transistor.
7. the audio-frequency amplifier system of integrating based on computer USB power supply power supply and USB sound card as claimed in claim 5 is characterized in that, said integrated chip (U1) be built-in oscillator+4.5V extremely+the topological driver of 15V push-pull type current feed.
8. the audio-frequency amplifier system based on power supply of computer USB power supply and the integration of USB sound card as claimed in claim 5 is characterized in that said integrated chip (U1) adopts thermal-enhanced 8 pin μ MAX encapsulation, is operated in-40 ° of C to+125 ° of C temperature ranges.
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| CN103281654A (en) * | 2013-04-16 | 2013-09-04 | 深圳市泰金田科技有限公司 | Method and device for increasing amplifier power utilization rate by compensating crest power with trough power |
| CN104658592A (en) * | 2015-02-09 | 2015-05-27 | 深圳市魅动音响有限公司 | Large-power audio playing circuit and audio playing device |
| CN105307085A (en) * | 2015-11-05 | 2016-02-03 | 深圳市桑达无线通讯技术有限公司 | Chargeable audio amplifying device |
| CN105307085B (en) * | 2015-11-05 | 2019-05-14 | 深圳市桑达无线通讯技术有限公司 | A kind of chargeable audio amplification device |
| CN108476355A (en) * | 2015-12-25 | 2018-08-31 | 松下知识产权经营株式会社 | Protective device |
| CN106557141A (en) * | 2016-11-18 | 2017-04-05 | 合肥联宝信息技术有限公司 | A kind of electronic equipment |
| CN109151662A (en) * | 2017-06-27 | 2019-01-04 | 鸿富锦精密工业(武汉)有限公司 | Audio power circuit |
| CN108054811A (en) * | 2018-01-24 | 2018-05-18 | 深圳市卡铃科技有限公司 | A kind of lithium battery effect device power supply |
| CN110445212A (en) * | 2019-08-12 | 2019-11-12 | 杨成波 | A method of control discharge current is exported based on cell voltage clipping regulation power |
| WO2021044081A1 (en) * | 2019-09-04 | 2021-03-11 | 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 |
| WO2023142574A1 (en) * | 2022-01-27 | 2023-08-03 | 上海商汤智能科技有限公司 | Adjustment circuit and electronic device |
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Application publication date: 20120926 |