CN114697593A - Power supply system of audio and video integrated machine - Google Patents
Power supply system of audio and video integrated machine Download PDFInfo
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- CN114697593A CN114697593A CN202011624781.3A CN202011624781A CN114697593A CN 114697593 A CN114697593 A CN 114697593A CN 202011624781 A CN202011624781 A CN 202011624781A CN 114697593 A CN114697593 A CN 114697593A
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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 audio and video all-in-one, include: the audio and video integrated machine 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 device of the audio and 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 piece of electric equipment in the power supply signal; the deconcentrator is used for dividing one path of power supply signal into a plurality of paths of sub-power supply signals; the filtering parameters of the common mode inductor are matched with the audio frequency sensitive frequency band parameters of the connected electric equipment and used for filtering interference signals in the sub power supply signals. According to the technical scheme, the power supply quality 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 all-in-one machine.
Background
At present, audio and video equipment is arranged in commercial indoor scenes such as KTVs, restaurant rooms and the like, is mainly in a zero-dispersion mode and comprises televisions, jukeboxes, effectors, wireless microphone receivers, sound boxes, song-ordering screens, microphones and the like, the audio and video equipment is always required to be arranged on site according to the modeling, the size and the hard-mounting scheme of each room, and the time cost, the labor cost, the material cost and the purchase cost are high.
In order to solve the above problems, an audio and video all-in-one machine is currently on the market, and audio devices, video devices and the like are integrated into one device platform for use, which is particularly critical for supplying power to the devices.
Disclosure of Invention
The application provides a power supply system of an audio and video all-in-one machine, which aims to improve the power supply stability of the audio and video all-in-one machine.
A power supply system of an audio and video integrated machine comprises: the audio and video integrated machine 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 device of the audio and video integrated machine through a common-mode inductor;
the power switch is used for switching on/off power supply;
the power supply suppression circuit is used for suppressing power supply noise corresponding to the audio sensitive frequency band of each piece of electric equipment in a power supply signal;
the deconcentrator is used for dividing one path of power supply signal into a plurality of paths of sub-power supply signals;
and the filtering parameters of the common-mode inductor are matched with the audio-frequency sensitive frequency band parameters of the connected electric equipment and are used for filtering interference signals 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: the standby power supply circuit is connected with the power plug, and the control circuit is connected with the standby power supply circuit; the standby power circuit outputs power to the control circuit, and the control circuit outputs a control signal 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 a communication network and used for receiving a switch control signal of a 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, a filter capacitor with a specific frequency is further connected in parallel to two ends of the common mode inductor, and is used for filtering out interference signals associated with the operating frequency of the electric equipment.
In one embodiment, 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 mainboard, an analog board and a digital board, wherein the mainboard 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, at least one LC filter circuit is connected to the hot wire of the host system; the zero lines of the full-frequency power amplifier and the bass power amplifier are connected with at least one LC filter circuit;
the LC filter circuit is used for filtering out interference signals associated with the working frequency of the electric equipment.
In one embodiment, the power supply rejection circuit comprises a plurality of sets of LC resonant circuits, the LC resonant circuits being formed by 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 device, and the resonance point is in a high-impedance state, so that the power supply noise of the sensitive frequency band is suppressed; and a low impedance state at a fundamental frequency of the power supply, a power supply signal of the power supply supplying power to the powered device through the LC resonant circuit.
In one embodiment, the inductor L1 is an adjustable inductor; 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 with the power plug and 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 and outputting the control signal to the power supply suppression circuit.
In one embodiment, the power supply system of the audio and 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 supply noise and the sensitive frequency range 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 suppressed frequency range of power supply noise according to the sensitive frequency range, and calculate a control signal according to the suppressed frequency range;
the power supply suppression circuit is used for generating corresponding harmonic frequency compensation power supply signals according to the control signals and suppressing the power supply noise;
the signal detection circuit is also connected with 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 range parameters 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 voltage reduction 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 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;
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.
The above technical scheme of this application has following beneficial effect:
(1) the power supply is divided into a plurality of paths of sub-power supplies to supply power to each electric device, so that interference and influence among all paths of power supply power supplies can be avoided, power supply noise corresponding to the audio sensitive frequency band of each electric device in a power supply signal is suppressed through the power supply suppression circuit, and interference signals of the power supply are reduced; the common mode inductor with the matched filtering parameters and the audio frequency sensitive frequency band parameters of the connected electric equipment is designed, so that interference signals in the sub power supply signal can be accurately filtered, the power supply quality is improved, and the power supply stability is ensured.
(2) The method comprises the steps that sensitive frequency bands determined by all electric equipment are obtained through an MCU control circuit, and the LC resonance circuit of an electric power supply suppression circuit is in a high-impedance state at a resonance point matched with the sensitive frequency bands of the electric equipment, so that power supply noise of the sensitive frequency bands is suppressed, and interference is filtered; the suppression of interference signals is realized at relatively low hardware cost, and power supply noise is accurately eliminated.
(3) In the electric equipment, at least one LC filter circuit is connected with a live wire of a host system; the zero lines of the full-frequency power amplifier and the bass power amplifier are connected with at least one LC filter circuit; through LC filter circuit, the external interference signal that gets into the host system is filtered respectively to and the interference signal that produces heavy current such as power amplifier is filtered, avoid interfering other equipment.
(4) Different frequencies are respectively corresponding to each LC resonance circuit, and different interference points and interference frequencies are suppressed; or each LC resonance circuit corresponds to the same frequency and performs superposition suppression on the same interference point and the same interference frequency; to provide a circuit suppressing effect on the interference frequency. The multiple groups of LC resonance circuits can form combined suppression of interference signals of multiple frequency bands, so that the suppression of the interference signals is improved, and power supply noise is selectively and accurately eliminated.
Additional aspects and advantages of the present 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 present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of a power supply system of an audio-video combo of an embodiment;
fig. 2 is a block diagram of a power supply system of an av all-in-one machine of 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 av all-in-one machine of still another embodiment;
FIG. 5 is a schematic diagram of the structure of the related circuit connected to the interference suppression circuit;
fig. 6 is a schematic diagram of a power supply suppression circuit.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. 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, or operations, but do not preclude the presence or addition of one or more other features, integers, steps, operations, or groups thereof.
The audio and video all-in-one machine can be audio and video processing equipment with high software and hardware integration, multi-scene application and convenience for field deployment, and a power supply system can be connected to a power supply line of a power supply (such as alternating current 220V) through a power plug.
Referring to fig. 1, fig. 1 is a structural diagram of a power supply system of an audio/video all-in-one machine of an embodiment, including: the audio and video integrated machine 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 device of the audio and video integrated machine through a common-mode inductor;
the power switch is used for switching on/off power supply;
the power supply suppression circuit is used for suppressing power supply noise corresponding to the audio sensitive frequency band of each piece of electric equipment in a power supply signal;
the deconcentrator is used for dividing one path of power supply signal into a plurality of paths of sub-power supply signals;
and the filtering parameters of the common-mode inductor are matched with the audio-frequency sensitive frequency band parameters of the connected electric equipment and are used for filtering interference signals in the sub-power supply signal.
In the power supply system of the audio and video all-in-one machine, the power supply is divided into the plurality of paths of sub-power supplies to supply power to each power utilization device, so that interference and influence among all paths of power supply power supplies can be avoided, power supply noise corresponding to the audio sensitive frequency bands of all the power utilization devices in the power supply signal is suppressed through the power supply suppression circuit, and interference signals of the power supply are reduced; the common mode inductor with the matched filtering parameters and the audio frequency sensitive frequency band parameters of the connected electric equipment is designed, so that interference signals in the sub power supply signal 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, more embodiments are set forth below.
Referring to fig. 2, fig. 2 is a block diagram of a power supply system of an av all-in-one machine according to another embodiment.
As an embodiment, the consumer of this application can include host system, full power amplifier, bass power amplifier, TV set screen etc. as fig. 2 shows partial consumer, wherein, host system can include mainboard, analog board and digital board etc. again, and the integrated TV set of mainboard and song machine function, the analog board is used for handling analog audio and video signal, the digital board is used for handling digital audio signal, and audio and video all-in-one realizes audio frequency and video broadcast through these integrated above-mentioned equipment.
In one embodiment, as shown in fig. 2, the power switch may be a controlled air switch, and the power switch may include one or more of a manually controlled switch, an automatically timed switch, and a remote network controlled switch.
Furthermore, the power supply system of the audio and video integrated machine can also comprise a standby power supply circuit connected with a power 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, and the controlled air switch is ensured to be in a standby state all the time.
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, the network communication module is connected with a 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 control controlled air switch, a network communication module may be networked with a server through a local area network (WIFI) or an internet of things, receive a control signal, and for the network communication module, may be built in a host system of an audio/video all-in-one machine. The user can send the on-off control signal to the backstage server through the APP of installation above smart mobile phone, PC or panel computer etc. backstage server issues the on-off control signal, and controller output signal opens or closes for controlled air switch, realizes the remote control function.
In one embodiment, referring to fig. 4, fig. 4 is a structural diagram of a power supply system of an av all-in-one machine according to still another embodiment.
In this embodiment, a filter capacitor C3 with a specific frequency is further connected in parallel to two ends of the common mode inductor, so as to filter an interference signal associated with the operating frequency of the electrical equipment. Furthermore, the live wire of the host system is connected with at least one LC filter circuit; the zero lines of the full-frequency power amplifier and the bass power amplifier are connected with at least one LC filter circuit; the LC filter circuit is used for filtering out interference signals related to 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 of the power consumers, and the signal processor is further connected to each of the LC filter circuits.
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 respectively outputting the control signal to the power supply suppression circuit and the LC filter circuit.
Specifically, the MCU control circuit reads the sensitive frequency band parameters of each electric device and inputs the sensitive frequency band parameters of each electric device to the signal processor; the signal processor calculates a control signal according to the power supply noise and the sensitive frequency range parameters of the electric equipment, and outputs the control signal to the power supply suppression circuit and the LC filter circuit. The signal processor determines the range of the suppression frequency band of the power supply noise according to the sensitive frequency band, and calculates a control signal according to the range of the suppression frequency band; 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 is used for detecting the output power supply signal of the power supply suppression circuit and feeding the output power supply signal back to the signal processor, 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, the power supply suppression circuit is controlled to generate a corresponding harmonic frequency compensation power supply signal, a good closed loop is formed, and the power supply noise is suppressed more effectively.
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 broadband 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 a power supply signal in a set broadband range; the voltage reduction circuit is used for transforming the sampled power supply signal into 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, a signal conversion circuit connected between the signal processor and the power supply suppressing circuit may be further included for converting the control signal into a signal form conforming to the power supply suppressing 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 a control signal to the interference suppression circuit in an optical coupling isolation mode.
In the above embodiment, the optical coupling isolation amplifying circuit can prevent interference from being introduced, and is convenient for accurate control of 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 multiple sets of LC resonant circuits, as shown in the figure, two sets of LC resonant circuits are respectively connected to the live line and the neutral line, and the LC resonant circuits are formed by an inductor L1 and a capacitor C1 connected in parallel; the resonance point of the LC resonance circuit is matched with the sensitive frequency band of each electric device, and the resonance point is in a high-impedance state, so that the power supply noise of the sensitive frequency band is suppressed; and a low impedance state at a fundamental frequency of the power supply, a power supply signal of the power supply supplying power to the powered device through the LC resonant circuit. Specifically, the inductor L1 may be an adjustable inductor; the capacitor C1 may be an adjustable capacitor.
According to the scheme of the embodiment, through the multiple groups of LC resonance circuits, the parameters of the inductors and the capacitors are adjustable, and the calculated inductors and capacitors with different parameters are utilized, so that the combined suppression of interference signals in multiple frequency bands can be formed, 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 resonant circuits, the 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 quality of the power supply can be met, and when a 'clean and pure power supply' is needed, the suppression effect can be improved by performing parallel connection or series connection on a plurality of interference suppression circuits.
The description of the relevant embodiments is continued below.
In one embodiment, the inductor L1 is wound by copper wire with a diameter of more than 1mm, and the capacitor C1 is cbb capacitor; the inductor L2 is wound by a copper wire with the diameter of more than 1mm, and the capacitor C2 is a cbb capacitor; the sensitive frequency range can be 1KHz-3 KHz.
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 resonance circuit through the adjustable inductance and capacitance, so as 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 range which is very sensitive to the audio equipment in the power supply. For example, human hearing is particularly sensitive to a frequency band of an intermediate frequency (1KHz-3KHz), and a fundamental frequency of a mains power grid is 50Hz, so that a large amount of interference signals exist in the power grid, and a power supply generates waveform distortion after long-distance transmission, so that the interference signals of the frequency band sensitive to human hearing are generated. In addition, in order to make the copper loss of the inductor as low as possible, copper wires with the diameter of more than 1mm are selected for winding, and a cbb capacitor with high withstand voltage and low loss is selected as the capacitor, so that the interference signal is suppressed, and meanwhile, the useful signal almost passes through the capacitor without loss.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (10)
1. A power supply system of an audio and video integrated machine is characterized by comprising: the audio and video integrated machine 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 device of the audio and video integrated machine through a common-mode inductor;
the power switch is used for switching on/off power supply;
the power supply suppression circuit is used for suppressing power supply noise corresponding to the audio sensitive frequency band of each piece of electric equipment in a power supply signal;
the deconcentrator is used for dividing one path of power supply signal into a plurality of paths of sub-power supply signals;
and the filtering parameters of the common-mode inductor are matched with the audio-frequency sensitive frequency band parameters of the connected electric equipment and are used for filtering interference signals in the sub-power supply signal.
2. The power supply system of the audio-video integrated 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 supply system of an av all-in-one machine of claim 2, further comprising: the standby power supply circuit is connected with the power plug, and the control circuit is connected with the standby power supply circuit; the standby power circuit outputs power to the control circuit, and the control circuit outputs a control signal to the controlled air switch for switching.
4. The power supply system of the audio-video integrated machine according to claim 3, wherein the control circuit comprises a network communication module and a controller; the network communication module is connected with a communication network and used for receiving a switch control signal of a 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 the audio-video integrated machine according to claim 3, wherein a filter capacitor with a specific frequency is further connected in parallel to two ends of the common mode inductor, and is used for filtering interference signals associated with the working frequency of the electric equipment.
6. The power supply system of an audio-video integrated machine according to claim 3, wherein the power consuming 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 mainboard, an analog board and a digital board, wherein the mainboard 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 the audio-video integrated machine according to claim 5, wherein the live wire of the host system is connected with at least one LC filter circuit; the zero lines of the full-frequency power amplifier and the bass power amplifier are connected with at least one LC filter circuit;
the LC filter circuit is used for filtering out interference signals associated with the working frequency of the electric equipment.
8. The power supply system of the audio-video integrated machine according to claim 1, wherein the power supply suppression circuit comprises a plurality of groups of LC resonance circuits, and each LC resonance circuit is 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 device, and the LC resonance circuit is in a high-impedance state at the resonance point and is used for inhibiting the power supply noise of the sensitive frequency band; and a low impedance state at a fundamental frequency of the power supply, a power supply signal of the power supply supplying power to the powered device through the LC resonant circuit.
9. A power supply system for an av all-in-one machine according to any one of claims 1 to 8, further comprising: a signal detection circuit and a signal processor;
the signal detection circuit is connected with the power plug and 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 and outputting the control signal to the power supply suppression circuit.
10. The power supply system of the audio-video integrated machine according to claim 9, further comprising an MCU control circuit connected to 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 supply noise and the sensitive frequency range parameters of the electric equipment and outputting the control signal to the power supply suppression circuit and the LC filter circuit.
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|---|---|
| CN114697593B (en) | 2023-11-10 |
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