CN111030465A - Wireless audio receiving device with isolated power supply - Google Patents
Wireless audio receiving device with isolated power supply Download PDFInfo
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- CN111030465A CN111030465A CN201911348820.9A CN201911348820A CN111030465A CN 111030465 A CN111030465 A CN 111030465A CN 201911348820 A CN201911348820 A CN 201911348820A CN 111030465 A CN111030465 A CN 111030465A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- Dc-Dc Converters (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
A power supply isolated wireless audio receiving device comprises a direct current input joint, a power supply isolation circuit, an audio receiving circuit and an audio output joint, wherein the direct current input joint is used for receiving a first direct current input by an external power supply; the power supply isolation circuit is used for inverting and rectifying the first direct current into second direct current and isolating the grounding ends of the first direct current and the second direct current; the audio receiving circuit is electrically connected with the power supply isolation circuit and is connected with the second direct current for wirelessly receiving the sound signal and converting the sound signal into an analog audio signal; the audio output joint is used for outputting the analog audio signal to the external playing equipment for sound playing. Because the power supply isolation circuit is arranged between the direct current input joint and the audio receiving circuit, the first direct current input by the external power supply can eliminate self-superimposed high-frequency interference signals in the process of inversion and rectification, and the high-frequency interference signals are prevented from being transmitted to the audio receiving circuit in a common-ground mode.
Description
Technical Field
The invention relates to the technical field of audio playing electronics, in particular to a power supply isolated wireless audio receiving device.
Background
Along with the improvement of material conditions, the family audio-visual entertainment system and the vehicle-mounted audio receiving and playing system are gradually popularized, so that some inconveniences are exposed while comfortable entertainment experience is provided for users, ports of physical connection between sound equipment and data source equipment are various, the connection is complex, related standards and technical application in various audio fields are obviously differentiated and are not compatible with each other, and the current high-fidelity sound equipment is poor in flexibility so that power supply connection is inconvenient.
At present, a plurality of manufacturers adopt a wireless communication technology to optimize a communication connection mode between audio sending equipment and audio receiving equipment, and at the present stage, a conventional wireless audio playing system carries out wireless communication in a one-to-one mode and receives a single audio signal emitted by a fixed port. The wireless audio product can support equipment such as a PC, a mobile phone and a tablet to remotely transmit sound signals such as conversation and music to a sound system, wherein the Bluetooth audio receiving equipment and the WIFI audio receiving equipment have the characteristics of long transmission distance, low sound quality loss and low power consumption, and the application is relatively popularized.
In order to meet the requirement of normal operation of the audio receiving device, stable power needs to be provided for the audio receiving device independently. However, in the case of poor power supply adapters, chargers, power supply modules, or in the case of unstable power supply networks, some high-frequency interference signals may be present in the dc lines, and these high-frequency interference signals also tend to propagate along the power supply lines to the audio receiving device and reflect in the sound emission process of the audio receiving device, causing the speaker to make some unpleasant squeaking sounds. Even if some audio products stabilize direct current power through LC filter circuit, also can only play the effect that reduces/restrain power high frequency signal interference, can not stop completely, so under the audio products outside direct power supply or the circumstances of work of limit charging, will send the electric current sound through loudspeaker, seriously influence the user and experience the sense to the use of audio products.
Disclosure of Invention
The invention mainly solves the technical problems of how to eliminate the current sound generated when the existing audio receiving equipment controls sound to be externally played and how to improve the experience of users on audio products. In order to solve the technical problem, the application provides a wireless audio receiving device with isolated power supply.
In one embodiment, a power-isolated wireless audio receiving device is provided, comprising: the direct current input joint is used for receiving a first direct current input by an external power supply; the power supply isolation circuit is electrically connected with the direct current input connector and is used for inverting and rectifying the first direct current into second direct current and isolating the grounding ends of the first direct current and the second direct current; the audio receiving circuit is electrically connected with the power supply isolating circuit and is connected with the second direct current, and is used for wirelessly receiving sound signals and converting the sound signals into analog audio signals; and the audio output connector is electrically connected with the audio receiving circuit and is used for outputting the analog audio signal to an external device for sound playing.
The power supply isolation circuit comprises a self-oscillation circuit, a coil transformer and a rectifying circuit; the input end of the self-oscillation circuit is connected with the direct current input joint, and the output end of the self-oscillation circuit is connected with the primary side of the coil transformer and is used for inverting the first direct current into first alternating current in a self-oscillation mode; the primary side of the coil transformer drives the secondary side to couple and output a second alternating current under the action of the first alternating current; the rectifying circuit is connected with the secondary side of the coil transformer and used for rectifying the second alternating current into the second direct current.
The self-oscillation circuit comprises a triode Q1, a triode Q2, a resistor R1, a capacitor C1 and a capacitor C2, and the primary side of the coil transformer comprises a primary winding and a feedback winding which are wound on an iron core; the primary winding and the feedback winding are respectively provided with two edge ports and a middle port, and the middle port of the primary winding is connected with the first direct current; the middle port of the feedback winding is connected with the first direct current through the resistor R1 and the capacitor C1 which are arranged in parallel, and the resistor R1 and the connection line of the first direct current are connected with the grounding end of the first direct current through a capacitor C2; two edge ports of the primary winding are respectively connected with a collector of the triode Q1 and a collector of the triode Q2, two edge ports of the feedback winding are respectively connected with a base of the triode Q2 and a base of the triode Q1, and an emitter of the triode Q1 and an emitter of the triode Q2 are both connected with a grounding end of the first direct current.
The rectifying circuit comprises a diode D2, a diode D3, a resistor R2 and a capacitor C3, and the secondary side of the coil transformer comprises a secondary winding wound on an iron core; the secondary winding is formed with two edge ports and a middle port, the two edge ports of the secondary winding are respectively connected with the second direct current through the diode D2 and the diode D3, and the diode D3 and the connection line of the second direct current are connected with the ground terminal of the second direct current through the resistor R2 and the capacitor C3 which are arranged in parallel; the intermediate port of the secondary winding is connected to the ground terminal of the second direct current.
A protection circuit is arranged between the self-excited oscillation circuit and the direct current input connector and is used for carrying out current limiting and voltage limiting protection on the first direct current; the protection circuit includes fuse F1 and diode D1, fuse F1 is in series on the switch-on circuit of first direct current, diode D1's positive negative pole respectively with the ground terminal of first direct current with the switch-on circuit of first direct current is connected.
The audio receiving circuit comprises a receiving antenna and a main control chip; the receiving antenna is used for receiving sound signals radiated by the surroundings; the main control chip is electrically connected with the receiving antenna, the audio output connector and the rectifying circuit, and the rectifying circuit provides the second direct current for the main control chip; the main control chip is used for converting the sound signals received by the receiving antenna into analog audio signals and outputting the analog audio signals through the audio output joint; and the grounding end of the analog audio signal is connected with the grounding end of the second direct current.
The bandwidth of the receiving antenna is matched with that of the Bluetooth signal or the WIFI signal, and the sound signal on the Bluetooth signal channel or the WIFI signal channel is received.
The audio receiving circuit further comprises a microphone connector, and the microphone connector is used for receiving voice signals collected by an external microphone; the main control chip is electrically connected with the microphone connector and is also used for converting the voice signal into the analog audio signal.
The audio receiving circuit further comprises a crystal oscillator element connected with the main control chip, and the crystal oscillator element is used for providing a working clock for the main control chip.
The first power supply connector is a USB connector, and the audio output connector is a common audio connector.
The beneficial effect of this application is:
according to the wireless audio receiving device with power supply isolation of the embodiment, the wireless audio receiving device comprises a direct current input connector, a power supply isolation circuit, an audio receiving circuit and an audio output connector, wherein the direct current input connector is used for receiving a first direct current input by an external power supply; the power supply isolation circuit is used for inverting and rectifying the first direct current into second direct current and isolating the grounding ends of the first direct current and the second direct current; the audio receiving circuit is electrically connected with the power supply isolation circuit and is connected with the second direct current for wirelessly receiving the sound signal and converting the sound signal into an analog audio signal; the audio output joint is used for outputting the analog audio signal to the external playing equipment for sound playing. On the first hand, because the power supply isolation circuit is arranged between the direct current input joint and the audio receiving circuit, the first direct current input by the external power supply can eliminate the high-frequency interference signal superposed by the first direct current input joint in the process of inversion and rectification, and the high-frequency interference signal is prevented from being transmitted to the audio receiving circuit in a common ground mode; in the second aspect, due to the power coupling and mutual isolation between the primary side and the secondary side of the coil transformer in the power supply isolation circuit, not only can the transmission of power be realized, but also the high-frequency interference situation caused by the grounding ends at the two sides can be avoided, even if the power supply of an external power supply is not clean, the power supply quality of the audio receiving circuit can not be influenced, and the stability of the audio receiving circuit for processing sound signals can be ensured; in the third aspect, the audio receiving circuit is powered by the second direct current which does not carry the high-frequency interference signal, so that the audio receiving circuit can output a clean and undistorted analog audio signal without being influenced by the high-frequency interference signal in the process of wirelessly receiving the sound signal and converting the sound signal into the analog audio signal; in the fourth aspect, under the condition that no high-frequency interference signal exists on the analog audio signal, pure tone quality can be emitted when the external device plays sound, the problem of current sound caused by high-frequency interference is completely eradicated, and the use experience of a user on the wireless audio receiving device can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a power supply isolated wireless audio receiving device according to the present application;
FIG. 2 is a circuit diagram of a power supply isolation circuit;
FIG. 3 is a circuit diagram of a protection circuit;
fig. 4 is a schematic structural diagram of an audio receiving circuit.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, the present application discloses a power supply isolated wireless audio receiving device 1, which includes a dc input connector 11, a power supply isolating circuit 12, an audio receiving circuit 13 and an audio output connector 14, which are described below.
The DC input connector 11 is configured to receive a first DC power input from an external power source, where the external power source may be a DC charger, a DC adapter, a charger, a battery, or other devices, and may even be a USB interface of a computer, a USB interface of a power strip, a vehicle-mounted power supply interface, and when the DC input connector 11 is connected to the external power source, the external power source may continuously provide the DC power to the DC input connector 11, such as power supply of DC 5V. Therefore, the dc input connector should have at least two pins for connecting the positive and negative poles of the first dc power, respectively, and the negative pole is usually in the form of a ground terminal.
The power supply isolation circuit 12 is electrically connected to the dc input connector 11, and is configured to invert and rectify the first dc power into a second dc power, and isolate the ground terminals of the first dc power and the second dc power.
It should be noted that the purpose of the power supply isolation circuit 12 is to isolate the direct current by means of power inverter coupling, so that the ground terminal for inputting the direct current and the ground terminal for outputting the direct current are not grounded together to achieve clean power transmission and eliminate the requirement of high-frequency interference signals.
The audio receiving circuit 13 is electrically connected to the power supply isolation circuit 12 and is connected to the second direct current, that is, the second direct current output by the power supply isolation circuit 12 is used to supply power to the audio receiving circuit 13, so that the audio receiving circuit 13 can wirelessly receive the sound signal and convert the sound signal into an analog audio signal.
The audio output connector 14 is electrically connected to the audio receiving circuit 13, and is configured to output the analog audio signal processed and generated by the audio receiving circuit 13 to an external device for sound playing. The playback apparatus may be a sound box having a speaker capable of playing out sound, and even the playback apparatus may be a home theater system, a conference video system, or a car audio system.
It should be noted that the lines in which the audio output connector 14, the audio receiving circuit 13 and the second dc power are located have a common ground terminal, and since high-frequency interference signals that may be superimposed in the first dc power cannot be superimposed on the second dc power under the isolation effect of the power supply isolation circuit 12, the second dc power has stable and pure characteristics, and does not cause high-frequency interference to the conversion process of the sound signals in the audio receiving circuit 13 and the output process of the analog audio signals in the audio output connector 14, so that it can be ensured that the external device can generate pure tone quality most completely when receiving and playing the analog audio signals, and the influence of current sound is avoided.
In the present embodiment, referring to fig. 1 and 2, the power supply isolation circuit 12 includes a self-oscillation circuit 121, a coil transformer 122, and a rectification circuit 123, which are respectively described below. Here, the self-oscillation is also called self-oscillation, and here, a meaning is expressed, so that strict distinction is not made.
The self-oscillation circuit 121 has an input terminal connected to the dc input terminal 11 and an output terminal connected to the primary side of the coil transformer 122. In the present exemplary embodiment, the self-oscillating current 121 serves to invert the first direct current into the first alternating current by means of self-oscillation, in order to couple the first alternating current in the form of an alternating current in the coil transformer 122.
The primary side of the coil transformer 122 drives the secondary side to couple out the second alternating current under the action of the first alternating current. The operation principle of the coil transformer 122 is prior art, so it will not be described in detail here.
The rectifying circuit 123 is connected to the secondary side of the coil transformer 122, and since the secondary side of the coil transformer 122 outputs ac power, which cannot directly supply power to the subsequent audio receiving circuit 13, it is necessary to rectify the second ac power into the second dc power by using the rectifying circuit 123, and then supply power to the audio receiving circuit 13 by using the second dc power.
In a specific embodiment, a specific circuit diagram of the self-oscillation circuit 121, the coil transformer 122 and the rectifying circuit 123 may refer to fig. 2, wherein the self-oscillation circuit 121 includes a transistor Q1, a transistor Q2, a resistor R1, a capacitor C1 and a capacitor C2, and the primary side of the coil transformer 122 includes a primary winding 1221 wound around a core and a feedback winding 1222.
Referring to fig. 2, a primary winding 1221 and a feedback winding 1222 are wound side by side on a core of the coil transformer 122, both of which are formed with two edge ports and one middle port, for example, the primary winding 1221 includes edge ports P1, P3 and a middle port P2, and the feedback winding 1222 includes edge ports P4, P6 and a middle port P5. An intermediate port P2 of the primary winding 1221 is connected to a first dc VCC1, an intermediate port P5 of the feedback winding 1222 is connected to a first dc VCC1 via a resistor R1 and a capacitor C1 which are arranged in parallel, and a connection line of the resistor R1 and the first dc VCC1 is connected to a ground GND1 of the first dc VCC1 via the capacitor C2. In addition, two edge ports P1 and P3 of the primary winding 1221 are respectively connected to a collector of the transistor Q1 and a collector of the transistor Q2, two edge ports P4 and P6 of the feedback winding 1222 are respectively connected to a base of the transistor Q2 and a base of the transistor Q1, and an emitter of the transistor Q1 and an emitter of the transistor Q2 are both connected to a ground terminal GND1 of the first dc VCC 1.
The collector of the transistor Q1 and the collector of the transistor Q2 are denoted by C, the emitter by E, and the base by B.
Referring to fig. 2, the rectifying circuit 123 includes a diode D2, a diode D3, a resistor R2, and a capacitor C3, and the secondary side of the coil transformer 122 includes a secondary winding 1223 wound around an iron core. The secondary winding 1223 is formed with two edge ports P7, P9 and a middle port P8, the two edge ports P7, P9 of the secondary winding are respectively connected with the second dc VCC2 through a diode D2 and a diode D3, and the connection lines of the diode D3 and the second dc VCC2 are connected with the ground terminal GND2 of the second dc VCC2 through a resistor R2 and a capacitor C3 which are arranged in parallel; further, the intermediate port P8 of the secondary winding is connected to the ground GND2 of the second dc VCC 2.
The operation of the supply isolation circuit 12 will now be described with reference to fig. 2. When the first dc VCC1 is powered up, a bias voltage is provided to the transistors Q1 and Q2, and since the two transistors may not have identical performance, the base currents flowing in the two transistors are different, resulting in different collector currents. Assuming that the current flowing through the transistor Q1 is I1, the current flowing through the transistor Q2 is I2, and I1 is greater than I2, the magnitude and direction of the magnetic flux of the coil transformer 122 are determined by the current I1, and the change in the magnetic flux generates an induced potential in the negative feedback winding 1222, so that the P4 port of the feedback winding 1222 is "negative", and at this time, the base potential of the transistor Q2 is lowered, so that the current I2 is lowered, and negative feedback is formed for the transistor Q2, positive and negative feedback is formed for the transistor Q1, and the current I1 is increased, so that the magnetic flux synthesized on the iron core is also increased. The triode Q1 reaches a saturated conduction state through the change of magnetic flux and the interaction of induced potentials, the triode Q2 reaches a cut-off state, the magnetic flux reaches the maximum value at the moment, the change rate of the magnetic flux is zero, then the induced potentials are also zero, so that the base level potential of the triode Q1 is reduced, the current I1 is reduced, the change rate of the magnetic flux is reversed, namely the P4 port of the feedback winding 1222 is positive, positive feedback is formed on the triode Q2, negative feedback is formed on the triode Q1, the current I2 is larger and larger, the resultant magnetic flux is also larger, the triode Q2 reaches the saturated conduction state through the change of the magnetic flux and the action of the induced potentials, the triode Q1 reaches the cut-off state, the magnetic flux reaches the maximum value at. It can be seen that the self-oscillation circuit 121 is actually an RC resonant circuit, so that the process of changing the magnetic flux of the coil transformer 122 is continuously performed in a cycle at a specific frequency, thereby forming a first alternating current on the primary side and generating a second alternating current on the secondary side by the change of the magnetic flux.
When a first alternating current is generated on the primary winding 1221 and the feedback winding 1222 of the primary side, a second alternating current is generated on the secondary winding 1233. If the port P7 of the secondary winding 1223 is "positive" and the port P9 is "negative", the diode D2 is turned on, the diode D3 is turned off, and an induced electromotive force is formed at the output end of the diode D2; when the P9 port of the secondary winding 1223 is "positive" and the P7 port is "negative", the diode D3 is turned on, the diode D2 is turned off, and an induced electromotive force is formed at the output end of the diode D3. It can be seen that the rectifier circuit 123 is actually a full-bridge rectifier circuit, and an induced electromotive force can be formed at the connection end of the capacitor C2 and the resistor R2 regardless of the direction of the second ac power, so as to obtain the second dc power VCC 2.
Further, referring to fig. 3, a protection circuit 15 is disposed between the self-oscillation circuit 121 and the dc input terminal 11, and the protection circuit 15 is used for current-limiting and voltage-limiting protection of the first dc voltage VCC 1. In one embodiment, the protection circuit 15 includes a fuse F1 and a diode D1, the fuse F1 is connected in series to the connection line of the first dc VCC1, and the anode and cathode of the diode D1 are respectively connected to the ground GND1 of the first dc VCC1 and the connection line of the first dc VCC 1. Fuse F1 may be a self-recovery fuse that blows when the line current is excessive and diode D1 conducts when the line voltage is excessive. The diode D1 may be a zener diode or a TVS (transient diode), and is not particularly limited.
In the present embodiment, referring to fig. 4, the audio receiving circuit 13 includes a receiving Antenna 131 (also called Antenna, ANT) and a main control chip 132, which are respectively described as follows.
The receiving antenna 131 is used for receiving the sound signal radiated from the surroundings, and the receiving frequency band of the receiving antenna 131 is not particularly limited.
The main control chip 132 is electrically connected to the receiving antenna 131, the audio output connector 133 and the rectifying circuit 123, and the rectifying circuit 123 provides a second direct current VCC2 for the main control chip 132. The main control chip 132 is used for converting the sound signal received by the receiving antenna 131 into an analog audio signal, and outputting the analog audio signal through the audio output connector 133. The ground terminal of the analog audio signal is connected to the ground terminal GND2 of the second direct current.
It should be noted that, the main control chip 132 has a processing protocol of the audio signal, and can implement the functions of decoding and encoding the audio signal, so as to convert the audio signal into an analog audio signal with a certain format, which can facilitate the receiving and playing of the signal by the external device W1.
Further, the bandwidth of the receiving antenna 131 is matched with the bandwidth of the bluetooth signal or the WIFI signal, and receives the sound signal on the bluetooth signal channel or the WIFI signal channel. If a bluetooth signal is received, the main control chip 132 may be a bluetooth processing chip; if a WIFI signal is received, the main control chip 132 may be a network processing chip. Since the functions implemented by the main control chip 132 are commonly used in the daily life and can be frequently seen in some bluetooth devices or WIFI devices, the principle and structure thereof will not be described in detail here.
Further, the audio receiving circuit 13 further includes a microphone connector 134, and the microphone connector 134 is used for receiving a voice signal collected by an external Microphone (MIC); then, the main control chip 132 is electrically connected to the microphone connector 134 and also functions to convert a voice signal into an analog audio signal, so as to be output to the external device W1 through the audio output connector 133.
Further, the audio receiving circuit 13 further includes a crystal oscillator element 135 connected to the main control chip 132, and the crystal oscillator element 135 is configured to provide an operating clock for the main control chip 132. It should be noted that, when the main control chip 132 works, the external crystal oscillator is required to provide the working clock, which belongs to the basic working condition of the digital processing chip and is generally known by technicians, so that the detailed description is omitted here.
In this embodiment, the first power supply connector 11 may be a USB connector, so that the USB connector is connected to a power supply with USB power supply, so that the first direct current is 5V, and in order to adapt to the operating voltage of the main control chip 132, the second direct current output by the power supply isolation circuit 12 may also be 5V.
In this embodiment, the audio output connector 14 may be a common audio connector, such as a 3.5mm stereo interface, an RCA analog audio interface, an XLR interface, an S/PDIF interface, and an optical fiber interface, which is not specifically limited herein as long as the external device can be adapted.
It will be appreciated by those skilled in the art that in implementing the wireless audio receiving device provided in the present implementation, the following technical advantages may be achieved: (1) a power supply isolation circuit is arranged between the direct current input joint and the audio receiving circuit, so that a first direct current input by an external power supply can eliminate self-superimposed high-frequency interference signals in the process of inversion and rectification, and the high-frequency interference signals are prevented from being transmitted to the audio receiving circuit in a common-ground mode; (2) the power coupling and mutual isolation between the primary side and the secondary side of the coil transformer in the power supply isolation circuit can realize the transmission of power, avoid the high-frequency interference caused by the grounding ends at the two sides, not only can the power supply quality of the audio receiving circuit not be influenced even if the power supply of an external power supply is not clean, but also can ensure the stability of the audio receiving circuit in processing sound signals; (3) the audio receiving circuit is powered by second direct current which does not carry high-frequency interference signals, so that the audio receiving circuit can output clean and undistorted analog audio signals without being influenced by the high-frequency interference signals in the process of wirelessly receiving sound signals and converting the sound signals into analog audio signals; (4) under the condition that no high-frequency interference signal exists on the analog audio signal, pure tone quality can be emitted when sound playing is carried out on the external device, the problem of current sound caused by high-frequency interference is completely eradicated, and the use experience of a user on the wireless audio receiving device can be improved.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A power-isolated wireless audio receiving device, comprising:
the direct current input joint is used for receiving a first direct current input by an external power supply;
the power supply isolation circuit is electrically connected with the direct current input connector and is used for inverting and rectifying the first direct current into second direct current and isolating the grounding ends of the first direct current and the second direct current;
the audio receiving circuit is electrically connected with the power supply isolating circuit and is connected with the second direct current, and is used for wirelessly receiving sound signals and converting the sound signals into analog audio signals;
and the audio output connector is electrically connected with the audio receiving circuit and is used for outputting the analog audio signal to an external device for sound playing.
2. The wireless audio receiving apparatus according to claim 1, wherein the power supply isolation circuit includes a self-oscillation circuit, a coil transformer, and a rectifying circuit;
the input end of the self-oscillation circuit is connected with the direct current input joint, and the output end of the self-oscillation circuit is connected with the primary side of the coil transformer and is used for inverting the first direct current into first alternating current in a self-oscillation mode;
the primary side of the coil transformer drives the secondary side to couple and output a second alternating current under the action of the first alternating current;
the rectifying circuit is connected with the secondary side of the coil transformer and used for rectifying the second alternating current into the second direct current.
3. The wireless audio receiving apparatus of claim 2, wherein the self-oscillation circuit comprises a transistor Q1, a transistor Q2, a resistor R1, a capacitor C1 and a capacitor C2, and the primary side of the coil transformer comprises a primary winding and a feedback winding wound around a core;
the primary winding and the feedback winding are respectively provided with two edge ports and a middle port, and the middle port of the primary winding is connected with the first direct current; the middle port of the feedback winding is connected with the first direct current through the resistor R1 and the capacitor C1 which are arranged in parallel, and the resistor R1 and the connection line of the first direct current are connected with the grounding end of the first direct current through a capacitor C2; two edge ports of the primary winding are respectively connected with a collector of the triode Q1 and a collector of the triode Q2, two edge ports of the feedback winding are respectively connected with a base of the triode Q2 and a base of the triode Q1, and an emitter of the triode Q1 and an emitter of the triode Q2 are both connected with a grounding end of the first direct current.
4. The wireless audio receiving apparatus of claim 3, wherein the rectifying circuit comprises a diode D2, a diode D3, a resistor R2 and a capacitor C3, and the secondary side of the coil transformer comprises a secondary winding wound around a core;
the secondary winding is formed with two edge ports and a middle port, the two edge ports of the secondary winding are respectively connected with the second direct current through the diode D2 and the diode D3, and the diode D3 and the connection line of the second direct current are connected with the ground terminal of the second direct current through the resistor R2 and the capacitor C3 which are arranged in parallel; the intermediate port of the secondary winding is connected to the ground terminal of the second direct current.
5. The wireless audio receiving apparatus according to claim 2, wherein a protection circuit is provided between the self-oscillation circuit and the dc input terminal for current-limiting and voltage-limiting protection of the first dc current;
the protection circuit includes fuse F1 and diode D1, fuse F1 is in series on the switch-on circuit of first direct current, diode D1's positive negative pole respectively with the ground terminal of first direct current with the switch-on circuit of first direct current is connected.
6. The wireless audio receiving apparatus according to claim 2, wherein the audio receiving circuit includes a receiving antenna and a main control chip;
the receiving antenna is used for receiving sound signals radiated by the surroundings;
the main control chip is electrically connected with the receiving antenna, the audio output connector and the rectifying circuit, and the rectifying circuit provides the second direct current for the main control chip; the main control chip is used for converting the sound signals received by the receiving antenna into analog audio signals and outputting the analog audio signals through the audio output joint;
and the grounding end of the analog audio signal is connected with the grounding end of the second direct current.
7. The wireless audio receiving device as claimed in claim 6, wherein the receiving antenna has a bandwidth matching a bandwidth of a bluetooth signal or a WIFI signal, and receives a sound signal on the bluetooth signal channel or the WIFI signal channel.
8. The wireless audio receiving device as claimed in claim 6, wherein the audio receiving circuit further comprises a microphone connector for receiving a voice signal collected by an external microphone; the main control chip is electrically connected with the microphone connector and is also used for converting the voice signal into the analog audio signal.
9. The wireless audio receiving device as claimed in claim 6, wherein the audio receiving circuit further comprises a crystal oscillator element connected to the main control chip, and the crystal oscillator element is configured to provide an operating clock for the main control chip.
10. The wireless audio receiving device as claimed in any one of claims 1 to 9, wherein the first power supply connector is a USB connector, and the audio output connector is a general audio connector.
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| CN111030465B (en) | 2022-07-19 |
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