CN215420206U - Sound box power amplifying circuit - Google Patents
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- CN215420206U CN215420206U CN202120989529.6U CN202120989529U CN215420206U CN 215420206 U CN215420206 U CN 215420206U CN 202120989529 U CN202120989529 U CN 202120989529U CN 215420206 U CN215420206 U CN 215420206U
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Abstract
The utility model provides a sound box power amplification circuit, and belongs to the field of sound box circuits. The utility model comprises a gain adjusting unit for respectively performing gain adjustment on input high-pitch audio signals and low-pitch audio signals, a differential signal processing unit, a power amplifying unit and a loudspeaker, wherein the input end of the gain adjusting unit inputs frequency-divided audio signals, the output end of the gain adjusting unit is connected with the input end of the differential signal processing unit, the output end of the differential signal processing unit is connected with the input end of the power amplifying unit, the output end of the power amplifying unit is connected with the loudspeaker, and the utility model further comprises an EMI unit arranged between the differential signal processing unit and the power amplifying unit. The utility model has the beneficial effects that: effectively avoid signal interference and electromagnetic interference between each difference line, tone quality is better.
Description
Technical Field
The present disclosure relates to speaker circuits, and particularly to a speaker power amplifying circuit.
Background
The professional active sound box is suitable for occasions such as performances, nightclubs and bars, a high-power bass unit and a high-power horn are arranged in the sound box, so that a power amplifier circuit of the professional active sound box is required to have enough power, and the remote sound radiation is good.
In a professional active sound box in the prior art, a differential line is usually arranged, but the processing of electromagnetic interference on a sound source signal is lacked, so that the sound quality is influenced to a certain degree.
Eight cun active audio amplifier power commonly used on the market is low, and remote sound radiation effect is unsatisfactory to, the power of the active audio amplifier of specialty among the prior art is unstable, and the electric property performance of power amplifier module can't the at utmost be utilized, thereby further influences the radiation effect of sound.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a sound box power amplifying circuit.
The utility model comprises a gain adjusting unit for respectively performing gain adjustment on input high-pitch audio signals and low-pitch audio signals, a differential signal processing unit, a power amplifying unit and a loudspeaker, wherein the input end of the gain adjusting unit inputs frequency-divided audio signals, the output end of the gain adjusting unit is connected with the input end of the differential signal processing unit, the output end of the differential signal processing unit is connected with the input end of the power amplifying unit, the output end of the power amplifying unit is connected with the loudspeaker, and the utility model further comprises an EMI unit arranged between the differential signal processing unit and the power amplifying unit.
The utility model is further improved, the power amplifying unit comprises a power amplifying chip, the sound box power amplifying circuit also comprises a mute circuit, the input end of the mute circuit is connected with the audio input, and the output end of the mute circuit is connected with a mute pin of the power amplifying chip.
The utility model is further improved, the mute circuit comprises a signal amplifying unit, a rectifying unit, a reference voltage unit, a comparing unit and a switch unit, wherein the output end of the signal amplifying unit is connected with the input end of the rectifying unit, the output end of the rectifying unit is connected with the first input end of the comparing unit, the output end of the reference voltage unit is connected with the second input end of the comparing unit, the output end of the comparing unit is connected with the control end of the switch unit, one end of the switch unit is grounded, the other end of the switch unit is respectively connected with the mute pin of the power amplifying chip and the positive pole of the power supply, when a sound source signal is input, the switch unit is switched on, and when no sound source signal is input, the switch unit is switched off.
The utility model is further improved, and the power amplification chip adopts a digital input of TI company and a processed D-type amplifier TPA 3251.
The utility model is further improved and also comprises a PFC power supply circuit which provides a stable power supply for the sound box power amplification circuit.
The utility model is further improved, the PFC power circuit comprises a power input module, a rectification module, a PFC boost module capable of regulating and outputting stable voltage, a direct current-to-alternating current module, a transformer and a rectification module which are sequentially arranged according to the current direction, and the output end of the rectification module provides power for the power amplification unit.
The utility model is further improved, the PFC boost module includes a first energy storage unit, a switch unit, a control unit and a second energy storage unit, wherein an input end of the first energy storage unit is connected to an anode output end of the rectifier module, an output end of the first energy storage unit is respectively connected to one end of the switch unit and one end of the second energy storage unit, the other end of the second energy storage unit and the other end of the second energy storage unit are respectively connected to a cathode output end of the rectifier module, a feedback pin of the control unit is connected to a voltage output end, a control pin is connected to a control end of the switch unit, and one end of the second energy storage unit is a voltage output end to output a stable voltage.
In a further improvement of the present invention, the gain adjustment unit includes operational amplifiers U207A and U207B, wherein non-inverting inputs of the operational amplifiers U207A and U207B are grounded, an inverting input of the operational amplifier U207A is connected to the divided bass audio signal, an inverting input of the operational amplifier U207B is connected to the divided treble audio signal, and a capacitor and a resistor are respectively connected in parallel between the inverting inputs and the output of the operational amplifier U207A and the operational amplifier U207B.
In a further improvement of the present invention, the differential signal processing unit includes operational amplifiers U301A and U301B, wherein non-inverting INPUT terminals of the operational amplifiers U301A and U301B are grounded, an inverting INPUT terminal of the operational amplifier U301A is connected to an output terminal of the operational amplifier U207A, an output terminal of the operational amplifier U301A outputs a differential signal INPUT _ C, an inverting INPUT terminal of the operational amplifier U301A leads out a signal line and outputs a differential signal INPUT _ D, an inverting INPUT terminal of the operational amplifier U301B is connected to an output terminal of the operational amplifier U207B, an output terminal of the operational amplifier U301B outputs a differential signal INPUT _ B, and an inverting INPUT terminal of the operational amplifier U301B leads out a signal line and outputs a differential signal INPUT _ a.
The utility model is further improved, the EMI unit comprises four groups of resistors and capacitors which are connected in parallel, one end of each of the four groups of resistors and capacitors which are connected in parallel is grounded, and the other end of each of the four groups of resistors and capacitors which are connected in parallel is respectively connected with the output ends of the four differential signal lines.
Compared with the prior art, the utility model has the beneficial effects that: the two differential lines are arranged, common-mode noise is offset for signals input into the power amplification unit through the differential values, electromagnetic interference (EMI) is effectively inhibited, in addition, the electromagnetic interference of audio signals is further avoided through the arrangement of the EMI unit, and the tone quality is purer; the mute circuit can eliminate puff sound caused by on-off and noise without audio signal transmission, realize real mute and have better sound quality; the power IC adopts TPA3251 of TI company, and the power circuit adopts PFC power circuit, so that the power supply for TPA3251 is stable, the electric property of TPA3251 can be utilized to the maximum, the maximum power of two sound channels can reach 175W respectively, which is about twice of the power of eight-inch active sound boxes commonly used in the market, and the remote sound radiation achieves good effect.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic diagram of a power amplification circuit of the present invention;
fig. 3 is a PFC boost module schematic;
FIG. 4 is a schematic diagram of an initial state of the PFC boost module;
FIG. 5 is a schematic diagram illustrating a charging and energy storing state of the first energy storing unit;
FIG. 6 is a schematic diagram illustrating an energy storage state of the second energy storage unit;
FIG. 7 is a schematic diagram of the primary side circuit of the transformer of the present invention;
FIG. 8 is a schematic diagram of the secondary side circuit of the transformer of the present invention;
FIG. 9 is a schematic circuit diagram of an embodiment of a control unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the present invention includes a gain adjustment unit for performing gain adjustment on an inputted high-pitched audio signal and an inputted low-pitched audio signal, and further includes a differential signal processing unit, a power amplification unit and a speaker, wherein the input end of the gain adjustment unit inputs a frequency-divided audio signal, the output end of the gain adjustment unit is connected to the input end of the differential signal processing unit, the output end of the differential signal processing unit is connected to the input end of the power amplification unit, the output end of the power amplification unit is connected to the speaker, the present invention further includes an EMI unit disposed between the differential signal processing unit and the power amplification unit, and further includes a PFC power circuit for providing a stable power supply for the power amplification circuit of the sound box.
As shown in fig. 2-5, the power amplification unit of the present invention comprises a power amplification chip U302, and preferably, the power amplification chip U302 employs a digital input and processing high fidelity class D amplifier TPA3251 of the TI corporation, a high-end feedback design and proprietary high-speed gate drive error correction (PurePath)TMUltra-HD) has the advantages of ultralow audio distortion, excellent tone quality, low power consumption, high efficiency, small volume of an external radiator, high output power and the like. The power supply circuit adopts a forward switching power supply with PFC, the power supply circuit is added into a PFC loop, and when the voltage of a power grid is changed from 90 volts to 265 volts, the TPA3251 power supply voltage keeps 36 volts unchanged, so that the power utilization of the TPA3251 is maximized.
As shown in fig. 2, the power amplifier circuit of the sound box of this embodiment further includes a mute circuit, an input end of the mute circuit is connected to the audio input, and an output end of the mute circuit is connected to the mute pin 19 of the power amplifier chip U302.
The mute circuit of the embodiment comprises a signal amplification unit, a rectification unit, a reference voltage unit, a comparison unit and a switch unit, wherein the output end of the signal amplification unit is connected with the input end of the rectification unit, the output end of the rectification unit is connected with the first input end of the comparison unit, the output end of the reference voltage unit is connected with the second input end of the comparison unit, the output end of the comparison unit is connected with the control end of the switch unit, one end of the switch unit is grounded, the other end of the switch unit is respectively connected with a mute pin of a power amplification chip and a power supply anode, when a sound source signal is input, the switch unit is switched on, and when no sound source signal is input, the switch unit is switched off.
The signal amplifying unit of the embodiment is formed by connecting three stages of amplifying circuits in series. The operational amplifier U104A, U104B and U107A are included, wherein inverting input ends of the operational amplifiers U104A, U104B and U107A are grounded, an inverting input end of the operational amplifier U104A is connected with a sound source signal output end, an inverting input end of the operational amplifier U104B is connected with an output end of the operational amplifier U104A, and an inverting input end of the operational amplifier U107A is connected with an output end of the operational amplifier U104B. Of course, the detection device can be also provided with one stage and more stages, so that the noise signal can be detected more accurately.
The pin T0 MU1 in this example is connected to the output of an audio interface or audio input amplifier circuit, in which a rectifying unit, such as the BT MUTE bluetooth signal output pin in this example, may also be connected directly if the source of sound in the audio input amplifier circuit has been amplified through multiple stages to be detected.
Correspondingly, if there are several sound source inputs, a corresponding number of rectifying branches are provided, and one of the rectifying units in this example includes diodes D202 and D201, wherein the anode of the diode D202 is connected to the output terminal of the operational amplifier U107A, the cathode of the diode D202 is connected to the inverting input terminal of the comparator U107B, the anode of the diode D201 is grounded, and the cathode is connected between the anode of the diode D202 and the output terminal of the operational amplifier U107A. A diode can be independently arranged for rectification, and a rectification chip can be arranged for processing.
The voltage reference unit of the embodiment comprises resistors R231 and R232 and a capacitor C232, wherein the resistors R231 and R232 are connected in series, one end of the resistor R231 and the other end of the resistor R232 are connected with the positive electrode of the power supply, one end of the capacitor C232 is connected with the ground, and the other end of the capacitor C232 is connected with the space between the resistor R231 and the resistor R232 and the non-inverting input end of a comparator U107B respectively.
The switch unit in this embodiment is a triode Q301, and of course, may also be a switch tube, a field effect tube, or an MOS tube, etc., where one end of the switch unit is grounded and the other end is connected to the mute pin of the speaker power amplifier and the positive electrode of the power supply, respectively.
The delay unit in this example comprises a resistor R356 and a polar capacitor C426 connected in parallel, wherein the negative electrode of the polar capacitor C426 is grounded.
The working principle of the mute circuit of the embodiment is as follows:
when the power supply is turned on or off, the delay unit provides a delay function, so that pop sound caused by impact of instantaneous large voltage on the circuit when the power supply is just switched on or switched off is relieved.
In addition, if no signal is input into the audio input interface, the output signal is subjected to multi-stage amplification rectification processing and then is compared with the reference voltage, if the output signal is smaller than the reference voltage, the base electrode of the triode Q301 is at a low level, the triode Q301 cannot be conducted, the mute pin of the power amplifier chip of the sound box is at a high level, and at the moment, the power amplifier chip U302 does not work. When signals are input into the audio input interface, after processing, the base of the triode Q301 is at a high level, the triode Q301 is conducted, and the mute pin of the power amplifier chip of the sound box is at a low level, so that the power amplifier chip U302 works normally and outputs the amplified sound to a rear-stage loudspeaker. The real mute function when no signal is input is realized, and the phenomenon that a horn emits noise when no sound source is output is avoided.
The gain adjusting unit of the present example comprises operational amplifiers U207A, U207B, wherein the non-inverting input terminals of the operational amplifiers U207A, U207B are grounded, the inverting input terminal of the operational amplifier U207A is connected to the bass audio signal after frequency division, the inverting input terminal of the operational amplifier U207B is connected to the treble audio signal after frequency division, and a capacitor and a resistor are respectively connected in parallel between the inverting input terminals and the output terminals of the operational amplifier U207A and the operational amplifier U207B.
The differential signal processing unit comprises operational amplifiers U301A and U301B, wherein non-inverting INPUT ends of the operational amplifiers U301A and U301B are grounded, an inverting INPUT end of the operational amplifier U301A is connected with an output end of the operational amplifier U207A, an output end of the operational amplifier U301A outputs a differential signal INPUT _ C, a signal line is led out from an inverting INPUT end of the operational amplifier U301A, a differential signal INPUT _ D is output, an inverting INPUT end of the operational amplifier U301B is connected with an output end of the operational amplifier U207B, a differential signal INPUT _ B is output from an output end of the operational amplifier U301B, and a signal line is led out from an inverting INPUT end of the operational amplifier U301B, and a differential signal INPUT _ A is output.
The EMI unit of the embodiment comprises four groups of resistors and capacitors which are connected in parallel, wherein one end of each of the four groups of resistors and capacitors which are connected in parallel is grounded, and the other end of each of the four groups of resistors and capacitors which are connected in parallel is respectively connected with the output ends of the four differential signal lines.
Not only set up two difference lines, to the signal of input power amplification unit through the difference offset common mode noise, effectively restrain EMI (electromagnetic interference), in addition, through the setting of EMI unit, further avoided audio signal's electromagnetic interference, tone quality is purer.
As shown in fig. 3 and 9, the PFC Power circuit of this embodiment includes a Power input module, a rectifier module, a PFC (Power Factor Correction) boost module capable of adjusting and outputting a stable voltage, a dc-to-ac module, a transformer, and a rectifier module, which are sequentially arranged according to a current flow direction, and an output end of the rectifier module provides a Power supply for the Power amplification unit.
Preferably, this example further includes an EMI (electromagnetic interference) filter disposed between the power input module and the rectification module, thereby avoiding external electromagnetic interference.
According to the utility model, a PFC (power factor correction) loop is added in a professional active power amplifier power supply circuit, when the voltage of a power grid changes from 90V to 265V, the voltage input to a rear switch transformer T1 is always not changed into 380V through the PFC loop, so that the voltage of a secondary coil of a switch transformer T1 is kept unchanged at 36V after being rectified by D10, and further the power supply voltage of a power amplifier chip is kept unchanged at 36V. The power supply is stable, so that the electrical property of the power amplifier chip TPA3251 can be utilized to the maximum, the power utilization of the power amplifier chip TPA3251 is maximized, the maximum power of two sound channels can reach 175W respectively, which is about twice of the power of eight-inch active sound boxes (the power of the eight-inch active sound boxes is between 80W and 100W) commonly used in the market, and the remote sound radiation achieves a good effect.
Specifically, the PFC boost module of this embodiment includes a first energy storage unit, a switch unit, a control unit, and a second energy storage unit, wherein an input terminal of the first energy storage unit is connected to an anode output terminal of the rectifier module, an output terminal of the first energy storage unit is connected to one terminal of the switch unit and one terminal of the second energy storage unit, respectively, the other terminal of the second energy storage unit and the other terminal of the second energy storage unit are connected to a cathode output terminal of the rectifier module, respectively, a feedback pin of the control unit is connected to a voltage output terminal, a control pin is connected to a control terminal of the switch unit, and one terminal of the second energy storage unit is a voltage output terminal to output a stable voltage.
The switch unit can be a controllable electronic switch device such as an MOS (metal oxide semiconductor) tube, a field effect tube, a switch tube or a triode, the first energy storage unit is an inductor, and the second energy storage unit is an energy storage capacitor.
The working principle of the PFC boost module of this example is:
as shown in fig. 4, in the initial state, assuming that the middle switch unit is turned off, VAC charges Vou through the inductor and the diode, and after completion, Vou equals VAC. (assuming all elements are in an ideal state)
As shown in fig. 5, in the inductor charging energy storage state, when the middle switching element Q is turned on, VAC is turned on through an inductor, a transistor or a MOS transistor to form a loop, the current on the inductor linearly increases in a certain proportion, and as the current increases, a certain amount of energy VLO is stored in the inductor.
As shown in fig. 6, in the state where the inductor charges the capacitor, when the middle switching element Q is turned off, the capacitor is charged by the current through the diode due to the holding characteristic of the current flowing through the inductor, and the voltage on the capacitor is VAC + VLO, thereby completing the step-up.
The PFC IC adjusts the on and off time of the switching device Q to maintain Vou-VAC + VLO at a constant value, i.e., the output voltage is stabilized at a desired voltage.
As an embodiment of the present invention, a specific circuit diagram of the present example is shown in fig. 7 to 9, where the switching device Q of the present example is a switching tube Q3, the first energy storage unit is an inductor L5, an output end of the inductor L5 is connected in series to a diode D7, and two ends of the inductor L5 and the diode D7 which are connected in series are connected in parallel to a diode D8. The second energy storage unit is an energy storage filter capacitor C42.
The EMI filter of the example comprises an inductor L1, an inductor L2, a capacitor C35 and a capacitor C38, wherein the inductor L1 and the inductor L2 are connected in series, the capacitor C35 is connected in parallel between the inductors L1 and L2, and the capacitor C38 is connected in parallel at the output end of the inductor L2. In the embodiment, the output end of the EMI filter and the input end of the positive power supply of the rectifying module are also connected with a thermistor NTC in series.
As shown in fig. 9, pin 5 of the PFCIC U1 of this embodiment is connected to the voltage output terminal to receive the feedback of the output voltage, and pin 8 is connected to the control terminal of the switch Q3 to control the on/off of the switch Q3 according to the feedback output voltage.
As shown in fig. 7 and 8, a dc-to-ac module is disposed between the primary coil of the transformer T1 and the PFC boost module in this example, and 380V dc voltage output by the PFC boost module is converted into ac power by the switching action of the switching tubes Q1 and Q2, so that the voltage can be transmitted to the subsequent coil of the transformer T1, and the subsequent coil of the transformer T1 in this example is rectified into dc power by the rectifier D1, and then output to the power amplifier chip by the power interface CON 3.
The working principle of the PFC power supply circuit is as follows:
the input AC voltage is between 90V and 265V, and the direct current voltage VAC obtained by rectification is in the fluctuation range of RBV2510 of a BR1 rectifier bridge stack from an EMI filter and a thermistor NTC
The voltage of the energy storage filter capacitor C42 is kept at 380V by boosting the voltage of a PFC boosting module consisting of an inductor L5, a switching tube Q3, a diode D7, an energy storage filter capacitor C42 and the like and adjusting the on-off time of a switching tube Q3 through a PFC IC U1. The voltage input to the switching transformer T1 is kept stable at 380V, so that the supply voltage applied to the power amplifier circuit TPA3251 by the secondary rectification filter of the switching transformer T1 is stabilized at 36V, and the power of TPA3251 is maximized.
The above-described embodiments are intended to be illustrative, and not restrictive, of the utility model, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. The utility model provides a audio amplifier circuit which characterized in that: including the gain adjustment unit who carries out gain adjustment to the high pitch audio signal of input and bass audio signal respectively, still include difference signal processing unit, power amplification unit and loudspeaker, wherein, the audio signal of frequency division is input to gain adjustment unit's input, output termination difference signal processing unit's input, difference signal processing unit's output links to each other with power amplification unit's input, power amplification unit's output termination loudspeaker still includes the EMI unit of setting between difference signal processing unit and power amplification unit.
2. The speaker power amplification circuit of claim 1, wherein: the power amplification unit comprises a power amplification chip, the sound box power amplification circuit further comprises a mute circuit, the input end of the mute circuit is connected with the audio input, and the output end of the mute circuit is connected with a mute pin of the power amplification chip.
3. The speaker power amplification circuit of claim 2, wherein: the mute circuit comprises a signal amplification unit, a rectification unit, a reference voltage unit, a comparison unit and a switch unit, wherein the output end of the signal amplification unit is connected with the input end of the rectification unit, the output end of the rectification unit is connected with the first input end of the comparison unit, the output end of the reference voltage unit is connected with the second input end of the comparison unit, the output end of the comparison unit is connected with the control end of the switch unit, one end of the switch unit is grounded, the other end of the switch unit is respectively connected with a mute pin and a power supply anode of the power amplification chip, when a sound source signal is input, the switch unit is switched on, and when no sound source signal is input, the switch unit is switched off.
4. The speaker power amplification circuit of claim 2, wherein: the power amplification chip adopts a digital input of TI company and a processed D-type amplifier TPA 3251.
5. A loudspeaker box power amplification circuit according to any one of claims 1-4, characterised in that: the power amplifier circuit is characterized by further comprising a PFC power circuit for providing a stable power supply for the sound box power amplification circuit.
6. The speaker power amplification circuit of claim 5, wherein: the PFC power circuit comprises a power input module, a rectification module, a PFC boosting module capable of regulating and outputting stable voltage, a direct current-to-alternating current module, a transformer and a rectification module which are sequentially arranged according to the current flow direction, wherein the output end of the rectification module provides power for the power amplification unit.
7. The speaker power amplification circuit of claim 6, wherein: the PFC boost module comprises a first energy storage unit, a switch unit, a control unit and a second energy storage unit, wherein the input end of the first energy storage unit is connected with the positive output end of the rectification module, the output end of the first energy storage unit is respectively connected with one end of the switch unit and one end of the second energy storage unit, the other end of the second energy storage unit and the other end of the second energy storage unit are respectively connected with the negative output end of the rectification module, the feedback pin of the control unit is connected with the voltage output end, the control pin is connected with the control end of the switch unit, and one end of the second energy storage unit is a voltage output end and outputs stable voltage.
8. A loudspeaker box power amplification circuit according to any one of claims 1-4, characterised in that: the gain adjusting unit comprises operational amplifiers U207A and U207B, wherein non-inverting input ends of the operational amplifiers U207A and U207B are grounded, an inverting input end of the operational amplifier U207A is connected with a low-pitch audio signal after frequency division, an inverting input end of the operational amplifier U207B is connected with a high-pitch audio signal after frequency division, and a capacitor and a resistor are respectively connected between the inverting input ends and the output ends of the operational amplifier U207A and the operational amplifier U207B in parallel.
9. The speaker power amplification circuit of claim 8, wherein: the differential signal processing unit comprises an operational amplifier U301A and a U301B, wherein the non-inverting INPUT ends of the operational amplifier U301A and the U301B are grounded, the inverting INPUT end of the operational amplifier U301A is connected with the output end of the operational amplifier U207A, the output end of the operational amplifier U301A outputs a differential signal INPUT _ C, a signal line is led out from the inverting INPUT end of the operational amplifier U301A, a differential signal INPUT _ D is output, the inverting INPUT end of the operational amplifier U301B is connected with the output end of the operational amplifier U207B, the output end of the operational amplifier U301B outputs a differential signal INPUT _ B, a signal line is led out from the inverting INPUT end of the operational amplifier U301B, and a differential signal INPUT _ A is output.
10. The loudspeaker power amplification circuit of claim 9, wherein: the EMI unit comprises four groups of resistors and capacitors connected in parallel, one end of each of the four groups of resistors and capacitors connected in parallel is grounded, and the other end of each of the four groups of resistors and capacitors connected in parallel is connected with the output ends of the four differential signal lines respectively.
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| CN202120989529.6U CN215420206U (en) | 2021-05-10 | 2021-05-10 | Sound box power amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120989529.6U CN215420206U (en) | 2021-05-10 | 2021-05-10 | Sound box power amplifying circuit |
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| CN215420206U true CN215420206U (en) | 2022-01-04 |
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Address after: 518000 1st floor, electronic building, Jiuwei Xiange technology and Culture Industrial Park, Jiuwei community, Hangcheng street, Bao'an District, Shenzhen, Guangdong Province Patentee after: IAG Group Ltd. Address before: 518000 Jiuwei Xiange science and Technology Industrial Park, Xi Township, Bao'an District, Shenzhen City, Guangdong Province Patentee before: IAG GROUP Co.,Ltd. |
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