CN114697593B - Power supply system of audio-video integrated machine - Google Patents
Power supply system of audio-video integrated machine Download PDFInfo
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- CN114697593B CN114697593B CN202011624781.3A CN202011624781A CN114697593B CN 114697593 B CN114697593 B CN 114697593B CN 202011624781 A CN202011624781 A CN 202011624781A CN 114697593 B CN114697593 B CN 114697593B
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- 238000001514 detection method Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 14
- 230000006870 function Effects 0.000 claims description 6
- 230000005236 sound signal Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000002955 isolation Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 230000003287 optical effect Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
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Abstract
The application relates to a power supply system of an audio-video integrated machine, which comprises: the device comprises a power switch connected with a power plug, a power supply suppression circuit connected with the power switch and a one-to-many deconcentrator connected with the power supply suppression circuit, wherein each output end of the deconcentrator is connected to each electric equipment of the audio-video integrated machine through a common mode inductor; the power switch is used for switching on/off the power supply of the power supply; the power supply suppression circuit is used for suppressing power supply noise corresponding to the audio sensitive frequency band of each electric equipment in the power supply signal; the deconcentrator is used for dividing one path of power supply signal into multiple paths of sub power supply signals; the filtering parameter of the common mode inductance is matched with the audio sensitive frequency band parameter of the connected electric equipment, and is used for filtering the interference signal in the sub-power supply signal. According to the technical scheme, the quality of a power supply can be improved, and the power supply stability is ensured.
Description
Technical Field
The application relates to the technical field of audio and video, in particular to a power supply system of an audio and video integrated machine.
Background
At present, audio and video equipment is arranged in commercial indoor scenes such as KTV, restaurant suites and the like, mainly or sporadically, and the equipment comprises a television, a jukebox, an effector, a wireless microphone receiver, a sound box, a song requesting screen, a microphone and the like, and is often required to be arranged on site according to the modeling, the size and the hard-packed scheme of each room, and has high time cost, labor cost, material cost and purchase cost.
In order to solve the above problems, audio and video integrated machines are currently available on the market, and it is particularly critical to integrate audio devices and video devices into a device platform for supplying power to the devices, but because a large number of audio devices and video devices are integrated together, a large number of power lines are wired and various signal interferences, and higher requirements are put on the power supply design of the audio and video integrated machine, so that it is necessary to design a more stable power supply system against the above problems.
Disclosure of Invention
The application provides a power supply system of an audio-video integrated machine, which is used for improving the power supply stability of the audio-video integrated machine.
A power system for an audio-video all-in-one machine, comprising: the device comprises a power switch connected with a power plug, a power supply suppression circuit connected with the power switch and a one-to-many deconcentrator connected with the power supply suppression circuit, wherein each output end of the deconcentrator is connected to each electric equipment of the audio-video integrated machine through a common mode inductor;
the power switch is used for switching on/off the power supply of the power supply;
the power supply suppression circuit is used for suppressing power supply noise corresponding to the audio sensitive frequency band of each electric equipment in the power supply signal;
the deconcentrator is used for dividing one path of power supply signal into multiple paths of sub-power supply signals;
and the filtering parameter of the common mode inductor is matched with the audio sensitive frequency band parameter of the connected electric equipment and is used for filtering the interference signal in the sub-power supply signal.
In one embodiment, the power switch is a controlled air switch; wherein, the power switch comprises one or more of a manual control switch, an automatic timing switch and a remote network control switch.
In one embodiment, the power supply system of the audio-video integrated machine further includes: a standby power supply circuit connected with the power plug, and a control circuit connected with the standby power supply circuit; the standby power supply circuit outputs power to the control circuit, and the control circuit outputs control signals to the controlled air switch for switching.
In one embodiment, the control circuit includes a network communication module and a controller; the network communication module is connected with the communication network and is used for receiving a switch control signal of the remote network received by the network communication module; the controller is used for controlling the power switch to turn on/off the power supply according to the switch control signal.
In one embodiment, two ends of the common mode inductor are also connected in parallel with a filter capacitor with a specific frequency, and the filter capacitor is used for filtering interference signals associated with the working frequency of the electric equipment.
In one embodiment, the powered device includes: the system comprises a host system, a full-frequency power amplifier, a bass power amplifier and/or a television screen;
the host system comprises a main board, an analog board and a digital board, wherein the main board integrates functions of a television and a song ordering machine, the analog board is used for processing analog audio and video signals, and the digital board is used for processing digital audio signals.
In one embodiment, the fire wire of the host system is connected with at least one LC filter circuit; the zero line of the full-frequency power amplifier and the low-frequency power amplifier is connected with at least one LC filter circuit;
the LC filter circuit is used for filtering interference signals associated with the working frequency of the electric equipment.
In one embodiment, the power supply suppression circuit comprises a plurality of groups of LC resonance circuits, wherein the LC resonance circuits are composed of an inductor L1 and a capacitor C1;
the resonance point of the LC resonance circuit is matched with the sensitive frequency band of each electric equipment, and the resonance point is in a high impedance state to inhibit the power supply noise of the sensitive frequency band; and the power supply signal of the power supply supplies power to the electric equipment through the LC resonance circuit in a low impedance state at the fundamental frequency of the power supply.
In one embodiment, the inductance L1 is an adjustable inductance; the capacitor C1 is an adjustable capacitor.
In one embodiment, the power supply system of the audio-video integrated machine further includes: a signal detection circuit and a signal processor;
the signal detection circuit is connected to the power plug and is used for detecting power supply noise in a power supply signal and outputting the power supply noise to the signal processor;
the signal processor is connected with the signal detection circuit and the power supply suppression circuit, and is used for receiving the power supply noise and calculating a control signal according to the power supply noise to output to the power supply suppression circuit.
In one embodiment, the power supply system of the audio-video integrated machine further comprises an MCU control circuit connected with the signal processor; the MCU control circuit is also connected with the electric equipment, and the signal processor is also connected with each LC filter circuit;
the MCU control circuit is used for reading the sensitive frequency band parameters of the electric equipment and inputting the sensitive frequency band parameters of each electric equipment to the signal processor;
and the signal processor is used for calculating a control signal according to the power noise and the sensitive frequency band parameters of the electric equipment and outputting the control signal to the power supply suppression circuit and the LC filter circuit.
In one embodiment, the signal processor is configured to determine a suppression frequency band range of power supply noise according to the sensitive frequency band, and calculate a control signal according to the suppression frequency band range;
the power supply suppression circuit is used for generating corresponding harmonic frequency according to the control signal to compensate the power supply signal and suppressing the power supply noise;
the signal detection circuit is also connected to a power line between the power supply suppression circuit and the electric equipment and is used for detecting an output power supply signal of the power supply suppression circuit and feeding the output power supply signal back to the signal processor;
and the signal processor is used for calculating the control signal according to the power supply noise, the sensitive frequency band parameter of the electric equipment and the fed-back output power supply signal.
In one embodiment, the signal detection circuit includes: the broadband isolation sampling circuit, the voltage reduction circuit and the analog-to-digital conversion circuit are sequentially connected;
the broadband isolation sampling circuit is used for carrying out isolation sampling on the power supply signal in a set broadband range;
the step-down circuit is used for transforming the sampled power supply signal into a low-voltage analog voltage signal;
the analog-to-digital conversion circuit is used for converting the analog voltage signal into a digital voltage signal.
In one embodiment, the power supply system of the audio-video integrated machine further comprises a signal conversion circuit connected between the signal processor and the power supply suppression circuit, and the signal conversion circuit is used for converting the control signal into a signal form conforming to the power supply suppression circuit;
the signal conversion circuit includes: the digital-to-analog conversion circuit and the optical coupling isolation amplifying circuit are connected in sequence;
the digital-to-analog conversion circuit is used for converting the control signal output by the signal processor into an analog control signal;
the optical coupling isolation amplifying circuit is used for transmitting the control signal to the interference suppression circuit in an optical coupling isolation mode.
The technical scheme of the application has the following beneficial effects:
(1) The power supply is divided into multiple paths of sub-power supplies to supply power to each electric equipment, so that interference and influence among power supplies can be avoided, power supply noise corresponding to the audio sensitive frequency band of each electric equipment in a power supply signal is restrained through the power supply restraining circuit, and interference signals of the power supplies are reduced; the common mode inductance with the filtering parameters matched with the audio frequency sensitive frequency band parameters of the connected electric equipment is designed, so that interference signals in the sub power supply signals can be accurately filtered, the power supply quality is improved, and the power supply stability is ensured.
(2) The sensitive frequency band determined by each electric equipment is obtained through the MCU control circuit, the LC resonance circuit of the electric power supply suppression circuit is in a high impedance state at a resonance point matched with the sensitive frequency band of the electric equipment, the power supply noise of the sensitive frequency band is suppressed, and the interference is filtered; the interference signals are suppressed with relatively low hardware cost, and the power supply noise is accurately eliminated.
(3) In the electric equipment, a fire wire of a host system is connected with at least one LC filter circuit; at least one LC filter circuit is connected with the zero line of the full-frequency power amplifier and the low-frequency power amplifier; external interference signals entering the host system are filtered through the LC filter circuit, and interference signals generated by large currents such as power amplifiers are filtered, so that other equipment is prevented from being interfered.
(4) Each LC resonance circuit corresponds to different frequencies, and different interference points and interference frequencies are suppressed; or each LC resonant circuit corresponds to the same frequency, and performs superposition suppression on the same interference point and interference frequency; to provide a suppression effect of the circuit on the interference frequency. The LC resonance circuits can form combined suppression of interference signals of various frequency bands, so that the suppression of the interference signals is improved, and the power supply noise is selectively and accurately eliminated.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a block diagram of a power system of an audio-video all-in-one machine of an embodiment;
fig. 2 is a block diagram of a power supply system of an audio-video integrated machine according to another embodiment;
FIG. 3 is a schematic diagram of a remotely controlled air switch;
fig. 4 is a block diagram of a power supply system of an audio/video integrated machine according to still another embodiment;
FIG. 5 is a schematic diagram of the structure of the associated circuitry of the interference suppression circuit connection;
fig. 6 is a schematic diagram of a power supply suppressing circuit configuration.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, but do not preclude the presence or addition of one or more other features, integers, steps, operations.
The audio and video integrated machine can be audio and video processing equipment which is highly integrated in software and hardware, is applied to multiple scenes and is convenient for on-site deployment, and the power supply system can be connected to a power line of a power supply (such as 220V alternating current) through a power supply plug.
Referring to fig. 1, fig. 1 is a block diagram of a power supply system of an audio-video integrated machine according to an embodiment, including: the device comprises a power switch connected with a power plug, a power supply suppression circuit connected with the power switch and a one-to-many deconcentrator connected with the power supply suppression circuit, wherein each output end of the deconcentrator is connected to each electric equipment of the audio-video integrated machine through a common mode inductor;
the power switch is used for switching on/off the power supply of the power supply;
the power supply suppression circuit is used for suppressing power supply noise corresponding to the audio sensitive frequency band of each electric equipment in the power supply signal;
the deconcentrator is used for dividing one path of power supply signal into multiple paths of sub-power supply signals;
and the filtering parameter of the common mode inductor is matched with the audio sensitive frequency band parameter of the connected electric equipment and is used for filtering the interference signal in the sub-power supply signal.
According to the power supply system of the audio-video integrated machine, the power supply is divided into multiple paths of sub-power supplies to supply power to each electric equipment, interference and influence among power supplies can be avoided, power supply noise corresponding to the audio sensitive frequency band of each electric equipment in a power supply signal is restrained through the power supply restraining circuit, and interference signals of the power supplies are reduced; the common mode inductance with the filtering parameters matched with the audio frequency sensitive frequency band parameters of the connected electric equipment is designed, so that interference signals in the sub power supply signals can be accurately filtered, the power supply quality is improved, and the power supply stability is ensured.
In order to make the technical solution of the present application clearer, further embodiments are described below.
Referring to fig. 2, fig. 2 is a block diagram of a power supply system of an audio/video integrated machine according to another embodiment.
As an embodiment, the electric equipment of the present application may include a host system, a full-frequency power amplifier, a bass power amplifier, a television screen, and the like, and as shown in fig. 2, a part of the electric equipment may be shown in fig. 2, where the host system may further include a main board, an analog board, a digital board, and the like, the main board integrates functions of the television and the song-ordering machine, the analog board is used for processing analog audio and video signals, the digital board is used for processing digital audio signals, and the audio and video integrated machine realizes playing of audio and video through the integrated devices.
In one embodiment, as shown in FIG. 2, the power switch may employ a controlled air switch, including one or more of a manual control switch, an automatic timing switch, a remote network control switch.
Furthermore, the power supply system of the audio-video integrated machine can further comprise a standby power supply circuit connected with the power supply plug and a control circuit connected with the standby power supply circuit, wherein the standby power supply circuit outputs power to the control circuit, and the control circuit outputs a control signal to the controlled air switch for switching. Specifically, the power supply can be provided for the controlled air switch through the standby power supply, so that the controlled air switch is always in a standby state.
As an embodiment, when the power switch adopts a remote network control switch function, the control circuit may include a network communication module and a controller, where the network communication module is connected to the communication network and is configured to receive a switch control signal of the remote network received by the network communication module; the controller is used for controlling the power switch to turn on/off the power supply according to the switch control signal.
Referring to fig. 3, fig. 3 is a schematic diagram of a remote controlled air switch, where a network communication module may be networked with a server through a local area network (WIFI) or the internet of things, and receive a control signal, and for the network communication module, may be built in a host system of an audio/video integrated machine. The user can send the switch control signal to the background server through the APP installed on the smart phone, the PC or the tablet personal computer and the like, the background server sends the switch control signal, and the controller outputs the signal to the controlled air switch to be opened or closed, so that the remote control function is realized.
In one embodiment, referring to fig. 4, fig. 4 is a block diagram of a power supply system of an audio/video integrated machine according to still another embodiment.
In this embodiment, two ends of the common-mode inductor are further connected in parallel with a filter capacitor C3 with a specific frequency, so as to filter interference signals associated with the working frequency of the electric equipment. Further, a fire wire of the host system is connected with at least one LC filter circuit; the zero line of the full-frequency power amplifier and the low-frequency power amplifier is connected with at least one LC filter circuit; the LC filter circuit is used for filtering interference signals associated with the working frequency of the electric equipment.
In one embodiment, the power supply system of the audio-video integrated machine may further include a signal detection circuit, a signal processor, and an MCU control circuit. As shown in fig. 4, the signal detection circuit is connected to the power plug, the signal processor is connected to the signal detection circuit and the power suppression circuit, the MCU control circuit is connected to the signal processor, the MCU control circuit is further connected to each electrical equipment, and the signal processor is further connected to each LC filter circuit.
The signal detection circuit is used for detecting power supply noise in the power supply signal and outputting the power supply noise to the signal processor; the signal processor is used for receiving the power supply noise, calculating a control signal according to the power supply noise, and outputting the control signal to the power supply suppression circuit and the LC filter circuit respectively.
Specifically, the MCU control circuit reads the sensitive frequency band parameters of each electric equipment and inputs the sensitive frequency band parameters of each electric equipment to the signal processor; the signal processor calculates a control signal according to the power noise and the sensitive frequency band parameter of the electric equipment, and outputs the control signal to the power suppression circuit and the LC filter circuit. The signal processor determines the suppression frequency band range of the power supply noise according to the sensitive frequency band, and calculates a control signal according to the suppression frequency band range; the power supply suppression circuit generates a corresponding harmonic frequency compensation power supply signal according to the control signal so as to suppress power supply noise.
According to the scheme of the embodiment, the signal detection circuit detects the output power supply signal of the power supply suppression circuit and feeds the output power supply signal back to the signal processor, and the signal processor can calculate a more accurate control signal according to the power supply noise, the sensitive frequency band parameters of the electric equipment and the fed back output power supply signal, and control the power supply suppression circuit to generate a corresponding harmonic frequency compensation power supply signal to form a good closed loop so as to effectively suppress the power supply noise.
In an embodiment, referring to fig. 5, fig. 5 is a schematic structural diagram of a related circuit connected to an interference suppression circuit, and the signal detection circuit includes a wideband isolation sampling circuit, a voltage reduction circuit and an analog-to-digital conversion circuit connected in sequence; the broadband isolation sampling circuit is used for carrying out isolation sampling on the power supply signal in a set broadband range; a step-down circuit for transforming the sampled power supply signal to a low-voltage analog voltage signal; and the analog-to-digital conversion circuit is used for converting the analog voltage signal into a digital voltage signal.
As shown in fig. 5, further, the device may further include a signal conversion circuit connected between the signal processor and the power supply suppression circuit, for converting the control signal into a signal form conforming to the power supply suppression circuit; the signal conversion circuit includes: the digital-to-analog conversion circuit and the optical coupling isolation amplifying circuit are connected in sequence; the digital-to-analog conversion circuit is used for converting the control signal output by the signal processor into an analog control signal; and the optical coupling isolation amplifying circuit is used for transmitting the control signal to the interference suppression circuit in an optical coupling isolation mode.
In the embodiment, the optical coupler isolation amplifying circuit can prevent interference from being introduced, and is convenient for accurately controlling the power supply signal through the low-voltage control signal.
In one embodiment, as shown in fig. 6, fig. 6 is a schematic diagram of a power supply suppression circuit, which may include a plurality of sets of LC resonant circuits, as shown in the figure, two sets of LC resonant circuits respectively connected to a live wire and a zero wire, where the LC resonant circuits are formed by an inductance L1 and a capacitance C1 connected in parallel; the resonance point of the LC resonance circuit is matched with the sensitive frequency band of each electric equipment, and the resonance point is in a high impedance state to inhibit the power supply noise of the sensitive frequency band; and the power supply signal of the power supply supplies power to the electric equipment through the LC resonant circuit in a low impedance state at the fundamental frequency of the power supply. Specifically, the inductance L1 may be an adjustable inductance; the capacitor C1 may be a tunable capacitor.
According to the scheme of the embodiment, through the multiple groups of LC resonant circuits, the parameters of the inductance and the capacitance are adjustable, and the calculated inductance and capacitance with different parameters can be used for forming combined suppression of interference signals with multiple frequency bands, so that the suppression of the interference signals is further improved, and the power supply noise is selectively and accurately eliminated.
Through the application of a plurality of LC resonance circuits, a power supply suppression circuit with corresponding frequency can be selected according to the analysis result of the detection circuit, the requirements of different electric equipment on the power supply quality are met, and when a cleaner and purer power supply is needed, the parallel connection or series connection can be executed from a plurality of interference suppression to improve the suppression effect.
Related embodiments are described further below.
In one embodiment, the inductor L1 is wound by copper wires with diameters of more than 1mm, and the capacitor C1 is a cbb capacitor; the inductor L2 is wound by copper wires with diameters of more than 1mm, and the capacitor C2 is a cbb capacitor; the sensitive frequency range can be 1KHz-3KHz.
In one embodiment, the inductors L1 and L2 are adjustable inductors; the capacitor C1 and the capacitor C2 are adjustable capacitors; the control signal can be used to control the operation parameters of the LC resonant circuit by the adjustable inductance and capacitance to adaptively suppress the interference signal in the power supply signal.
According to the technical scheme of the embodiment, the LC resonance network is utilized to eliminate power supply noise in a frequency band very sensitive to the audio equipment in the power supply. For example, since human hearing is particularly sensitive to the intermediate frequency (1 KHz-3 KHz) band, and the fundamental frequency of the utility power grid is 50Hz, since a large amount of interference signals exist in the grid, waveform distortion can be generated after the power is transmitted for a long distance, and interference signals in the band to which human hearing is sensitive are generated. In order to reduce copper loss of the inductor as much as possible, copper wires with diameters of more than 1mm are selected for winding, and a capacitor is a cbb capacitor with high withstand voltage and low loss, so that interference signals are suppressed, and useful signals almost pass through the capacitor without damage.
The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the present application.
Claims (8)
1. The utility model provides a power supply system of audio and video all-in-one which characterized in that includes: the power supply control device comprises a power switch connected with a power plug, a power supply suppression circuit connected with the power switch, a one-to-many deconcentrator connected with the power supply suppression circuit, a signal detection circuit, a signal processor and an MCU control circuit connected with the signal processor; the output ends of the deconcentrators are connected to electric equipment of the audio-video integrated machine through common-mode inductors respectively;
the power switch is used for switching on/off the power supply of the power supply;
the power supply suppression circuit is used for suppressing power supply noise corresponding to the audio sensitive frequency band of each electric equipment in the power supply signal;
the deconcentrator is used for dividing one path of power supply signal into multiple paths of sub-power supply signals;
the filtering parameter of the common mode inductor is matched with the audio sensitive frequency band parameter of the connected electric equipment and is used for filtering the interference signal in the sub-power supply signal;
the signal detection circuit is connected to the power plug and is used for detecting power supply noise in a power supply signal and outputting the power supply noise to the signal processor;
the signal processor is connected with the signal detection circuit and the power supply suppression circuit, and is used for receiving the power supply noise and calculating a control signal according to the power supply noise to output to the power supply suppression circuit;
the MCU control circuit is also connected with the electric equipment, and the signal processor is also connected with each LC filter circuit;
the MCU control circuit is used for reading the sensitive frequency band parameters of the electric equipment and inputting the sensitive frequency band parameters of each electric equipment to the signal processor;
and the signal processor is used for calculating a control signal according to the power noise and the sensitive frequency band parameters of the electric equipment and outputting the control signal to the power supply suppression circuit and the LC filter circuit.
2. The power system of an audio-video all-in-one machine according to claim 1, wherein the power switch is a controlled air switch; wherein, the power switch comprises one or more of a manual control switch, an automatic timing switch and a remote network control switch.
3. The power system of an audio-video all-in-one machine according to claim 2, further comprising: a standby power supply circuit connected with the power plug, and a control circuit connected with the standby power supply circuit; the standby power supply circuit outputs power to the control circuit, and the control circuit outputs control signals to the controlled air switch for switching.
4. The power system of an audio-video all-in-one machine according to claim 3, wherein the control circuit comprises a network communication module and a controller; the network communication module is connected with the communication network and is used for receiving a switch control signal of the remote network received by the network communication module; the controller is used for controlling the power switch to turn on/off the power supply according to the switch control signal.
5. The power supply system of an audio-video integrated machine according to claim 3, wherein two ends of the common mode inductor are further connected in parallel with a filter capacitor with a specific frequency, and the filter capacitor is used for filtering interference signals associated with the working frequency of the electric equipment.
6. The power system of an audio-video all-in-one machine according to claim 3, wherein the powered device comprises: the system comprises a host system, a full-frequency power amplifier, a bass power amplifier and/or a television screen;
the host system comprises a main board, an analog board and a digital board, wherein the main board integrates functions of a television and a song ordering machine, the analog board is used for processing analog audio and video signals, and the digital board is used for processing digital audio signals.
7. The power supply system of an audio-video integrated machine according to claim 6, wherein a fire wire of the host system is connected with at least one LC filter circuit; the zero line of the full-frequency power amplifier and the low-frequency power amplifier is connected with at least one LC filter circuit;
the LC filter circuit is used for filtering interference signals associated with the working frequency of the electric equipment.
8. The power supply system of an audio-video integrated machine according to claim 1, wherein the power supply suppression circuit comprises a plurality of groups of LC resonance circuits, the LC resonance circuits being composed of an inductance L1 and a capacitance C1;
the resonance point of the LC resonance circuit is matched with the sensitive frequency band of each electric equipment, and the resonance point is in a high impedance state to inhibit the power supply noise of the sensitive frequency band; and the power supply signal of the power supply supplies power to the electric equipment through the LC resonance circuit in a low impedance state at the fundamental frequency of the power supply.
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