CN219041793U - Emergency broadcast source priority playing circuit - Google Patents

Emergency broadcast source priority playing circuit Download PDF

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CN219041793U
CN219041793U CN202221806430.9U CN202221806430U CN219041793U CN 219041793 U CN219041793 U CN 219041793U CN 202221806430 U CN202221806430 U CN 202221806430U CN 219041793 U CN219041793 U CN 219041793U
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module
resistor
power amplifier
converter
constant
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CN202221806430.9U
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邓国伟
蒲建
刘香峰
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Guangdong Nankong Yuntu Technology Co ltd
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Guangdong Nankong Yuntu Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The embodiment of the utility model discloses an emergency broadcast sound source priority playing circuit which comprises a constant voltage power amplification module, an audio step-down transformer, a converter, a loudspeaker, a constant resistance power amplification module and a detection module, wherein the constant voltage power amplification module is connected with the audio step-down transformer; the constant voltage power amplifier module is connected with the loudspeaker through the audio step-down transformer and the converter in sequence and is used for outputting a first audio signal, the constant resistance power amplifier module is connected with the loudspeaker through the converter, and the converter is used for controlling the loudspeaker to be communicated with the constant voltage power amplifier module or the constant resistance power amplifier module; the constant-voltage power amplifier module, the detection module and the converter are sequentially connected, the detection module is used for sending a control signal to the converter according to the first audio signal, and the converter is used for controlling the loudspeaker to be communicated with the constant-voltage power amplifier module according to the control signal. By adopting the embodiment of the utility model, the output of the power amplifier can be automatically turned off and judged when the emergency broadcast is inserted, so that the emergency broadcast source can be played preferentially.

Description

Emergency broadcast source priority playing circuit
Technical Field
The utility model relates to the technical field of audio playing, in particular to an emergency broadcast source priority playing circuit.
Background
As shown in fig. 1, in the existing broadcast audio system, a user may control a converter through a controller to select any one of the constant voltage power amplifier module and the constant resistance power amplifier module to output as a sound source for amplifying sound. When the constant voltage power amplifier module is required to be used as emergency broadcasting, the power amplifier is required to be immediately judged in order to conveniently insert local analog broadcasting, but the controller cannot detect when the local signal broadcasting is inserted, and at the moment, the output of the side of the constant voltage power amplifier is required to be manually closed, so that the intelligent operation cannot be realized.
Disclosure of Invention
The technical problem to be solved by the embodiment of the utility model is to provide the emergency broadcast source priority playing circuit which can automatically switch off the output of the power amplifier when the emergency broadcast is inserted so as to play the emergency broadcast source preferentially.
In order to solve the technical problems, the embodiment of the utility model provides an emergency broadcast source priority playing circuit, which comprises a constant voltage power amplifier module, an audio step-down transformer, a converter, a loudspeaker, a constant resistance power amplifier module and a detection module; the constant voltage power amplifier module is connected with the loudspeaker through the audio step-down transformer and the converter in sequence and is used for outputting a first audio signal, the constant resistance power amplifier module is connected with the loudspeaker through the converter and is used for outputting a second audio signal, and the converter is used for controlling the loudspeaker to be communicated with the constant voltage power amplifier module or the constant resistance power amplifier module; the constant-voltage power amplifier module, the detection module and the converter are sequentially connected, the detection module is used for sending a control signal to the converter according to the first audio signal, and the converter is used for controlling the loudspeaker to be communicated with the constant-voltage power amplifier module according to the control signal.
As an improvement of the scheme, the detection module comprises a step-down module, a transformer, a signal amplification module, a rectifying and filtering module and a judging module which are connected in sequence; the step-down module is connected with the constant-voltage power amplifier module, and the judging module is connected with the converter.
As an improvement of the above solution, the step-down module includes a first step-down module and a second step-down module; the positive output end of the constant voltage power amplifier module is connected with the first input end of the transformer through the first voltage reduction module, and the negative output end of the constant voltage power amplifier module is connected with the second input end of the transformer through the second voltage reduction module.
As an improvement of the above scheme, the first voltage dropping module and the second voltage dropping module each include a plurality of voltage dropping resistors connected in parallel.
As an improvement of the scheme, the signal amplifying module comprises an operational amplifier, a filter capacitor, a voltage dividing resistor, a first current limiting resistor, a second current limiting resistor, a first low-pass filter module, a feedback resistor, a compensation capacitor, a protection module, an output resistor and an output capacitor; the inverting input end of the operational amplifier is connected with the first output end of the transformer through the first current limiting resistor, the non-inverting input end of the operational amplifier is connected with the second output end of the transformer through the first low-pass filtering module and the second current limiting resistor in sequence, the first output end of the transformer is connected with the second output end of the transformer through the voltage dividing resistor, and the filtering capacitor is connected with the voltage dividing resistor in parallel; the output end of the operational amplifier is connected with one end of the output resistor and is connected with the inverting input end of the operational amplifier through the feedback resistor, the compensation capacitor is connected with the feedback resistor in parallel, and the other end of the output resistor is connected with the rectifying and filtering module through the output capacitor and is connected with the inverting input end of the operational amplifier through the protection module.
As an improvement of the above solution, the first low-pass filtering module includes a resistor and a resistor connected in parallel.
As an improvement of the above solution, the protection module includes a first TVS diode and a second TVS diode; the negative electrode of the first TVS diode is connected with the inverting input end of the operational amplifier, the positive electrode of the first TVS diode is connected with the positive electrode of the second TVS diode, and the negative electrode of the second TVS diode is connected with the other end of the output resistor.
As an improvement of the above scheme, the rectifying and filtering module comprises a rectifying module and a second low-pass filtering module which are sequentially connected.
As an improvement of the above-mentioned scheme, the rectifying module includes a first diode and a second diode; the positive pole of first diode with signal amplification module is connected and with the negative pole of second diode is connected, the positive pole of second diode ground connection, the negative pole of first diode with the second low pass filter module is connected.
As an improvement of the above scheme, the judging module includes a first triode, a second triode, a third current limiting resistor, a fourth current limiting resistor, a bias resistor, a fourth low-pass filtering module and a controller; the base electrode of the first triode is connected with the rectifying and filtering module through the third current limiting resistor, the collector electrode of the first triode is connected with the base electrode of the second triode through the fourth current limiting resistor, and the emitter electrode of the first triode is grounded; the emitter of the second triode is connected with working voltage and the base of the second triode through the bias resistor, and the emitter of the second triode is connected with the controller through the fourth low-pass filter module.
The embodiment of the utility model has the following beneficial effects:
in the emergency broadcast sound source priority playing circuit, the converter is used for controlling the loudspeaker to be communicated with one of the constant-voltage power amplification module and the constant-resistance power amplification module, when the detection module detects that the constant-voltage power amplification module outputs a first audio signal, the detection module sends a control signal to the converter, and the converter controls the loudspeaker to be communicated with the constant-voltage power amplification module according to the control signal, namely, the constant-voltage power amplification module is turned on to output and turned off to output, so that the function of automatically turning off the constant-voltage power amplification module to output is realized when emergency broadcasting is inserted, and emergency broadcast sound sources are played preferentially.
Drawings
Fig. 1 is a schematic block diagram of a conventional broadcast audio system;
FIG. 2 is a schematic block diagram of an emergency broadcast source priority playing circuit provided by the present utility model;
FIG. 3 is a schematic diagram of an emergency broadcast source priority playback circuit according to the present utility model;
FIG. 4 is a schematic circuit diagram of an emergency broadcast source priority playing circuit provided by the present utility model;
fig. 5 is an enlarged schematic view of the detection module of fig. 4.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent.
As shown in fig. 2, the embodiment of the utility model provides an emergency broadcast source priority playing circuit, which comprises a constant voltage power amplifier module 1, an audio step-down transformer 2, a converter 3, a loudspeaker 4, a constant resistance power amplifier module 5 and a detection module 6; the constant voltage power amplifier module 1 is connected with the loudspeaker 4 through the audio step-down transformer 2 and the converter 3 in sequence and is used for outputting a first audio signal, the constant resistance power amplifier module 5 is connected with the loudspeaker 4 through the converter 3 and is used for outputting a second audio signal, and the converter 3 is used for controlling the loudspeaker 4 to be communicated with the constant voltage power amplifier module 1 or the constant resistance power amplifier module 5; the constant-voltage power amplifier module 1, the detection module 6 and the converter 3 are sequentially connected, the detection module 6 is used for sending a control signal to the converter 3 according to the first audio signal, and the converter 3 is used for controlling the loudspeaker 4 to be communicated with the constant-voltage power amplifier module 1 according to the control signal.
In the emergency broadcast source priority playing circuit, the converter 3 is configured to control the loudspeaker 4 to be connected with one of the constant voltage power amplifier module 1 and the constant resistance power amplifier module 5, and when the detection module 6 detects that the constant voltage power amplifier module 1 outputs a first audio signal, the detection module 6 sends a control signal to the converter 3, and the converter 3 controls the loudspeaker 4 to be connected with the constant voltage power amplifier module 1 according to the control signal, that is, to switch on the output of the constant voltage power amplifier module 1 and switch off the output of the constant resistance power amplifier module 5, thereby realizing the function of automatically switching off the output of the resistance power amplifier when the emergency broadcast is inserted, so as to play the emergency broadcast source preferentially.
As shown in fig. 3, the detection module 6 includes a step-down module 61, a transformer 62, a signal amplifying module 63, a rectifying and filtering module 64, and a judging module 65, which are sequentially connected; the step-down module 61 is connected with the constant voltage power amplifier module 1, and the judging module 65 is connected with the converter 3. When the constant voltage power amplifier module 1 outputs a first audio signal, the step-down module 61 is configured to convert the first audio signal into a low voltage signal, the transformer 62 is configured to convert an unbalanced low voltage signal into a balanced low voltage signal, the signal amplifying module 63 is configured to convert the balanced low voltage signal into an amplified ac signal, the rectifying and filtering module 64 is configured to convert the amplified ac signal into a smooth dc level signal, and the judging module 65 is configured to control the loudspeaker 4 to communicate with the constant voltage power amplifier module 1 according to the dc level signal.
Referring to fig. 4 and 5, the specific structure of the detection module 6 is as follows:
step-down module
The buck module 61 includes a first buck module 611 and a second buck module 612; the positive output end 100V_OUT+ of the constant voltage power amplifier module 1 is connected with the first input end of the transformer T1 through the first voltage reducing module 611, and the negative output end 100V_OUT-of the constant voltage power amplifier module 1 is connected with the second input end of the transformer T1 through the second voltage reducing module 612. The first voltage dropping module 611 and the second voltage dropping module 612 each include a plurality of voltage dropping resistors connected in parallel, and are simple in structure and low in cost. In this embodiment, the first voltage reducing module 611 includes a resistor R2, a resistor R4, and a resistor R7 connected in parallel, and the second voltage reducing module 612 includes a resistor R9, a resistor R10, and a resistor R11 connected in parallel.
(II) Signal amplification Module
The signal amplifying module 63 includes an operational amplifier U1A, a filter capacitor C3, a voltage dividing resistor R8, a first current limiting resistor R3, a second current limiting resistor R12, a first low-pass filter module 631, a feedback resistor R1, a compensation capacitor C1, a protection module 632, an output resistor R5, and an output capacitor C2, the first low-pass filter module 631 includes a resistor R13 and a capacitor C4 connected in parallel, and the protection module 632 includes a first TVS diode Z1 and a second TVS diode Z2; the inverting input end of the operational amplifier U1A is connected with the first output end of the transformer T1 through the first current limiting resistor R3, the non-inverting input end of the operational amplifier U1A is connected with the second output end of the transformer T1 through the first low-pass filter module 631 and the second current limiting resistor R12 in sequence, the first output end of the transformer T1 is connected with the second output end of the transformer T1 through the voltage dividing resistor R8, and the filter capacitor C3 is connected with the voltage dividing resistor R8 in parallel; the output end of the operational amplifier U1A is connected with one end of the output resistor R5 and is connected with the inverting input end of the operational amplifier U1A through the feedback resistor R1, the compensation capacitor C1 is connected in parallel with the feedback resistor R1, and the other end of the output resistor R5 is connected with the rectifying and filtering module 64 through the output capacitor C2 and is connected with the inverting input end of the operational amplifier U1A through the protection module 632; the negative electrode of the first TVS diode Z1 is connected with the inverting input end of the operational amplifier U1A, the positive electrode of the first TVS diode Z1 is connected with the positive electrode of the second TVS diode Z2, and the negative electrode of the second TVS diode Z2 is connected with the other end of the output resistor R5. The resistor in the first low-pass filter module 631 is used for dividing voltage, the capacitor in the first low-pass filter module 631 is used for dividing voltage to play a role of low-pass filtering, the compensation capacitor C1 is used for compensating phase, preventing oscillation and inhibiting high-frequency noise, and the protection module 632 is used for playing a role of overvoltage protection. A step of
(IV) rectifying and filtering module
The rectifying and filtering module 64 includes a rectifying module 641 and a second low-pass filtering module 642 which are sequentially connected. The rectification module 641 includes a first diode D1 and a second diode D2; the positive electrode of the first diode D1 is connected to the signal amplifying module 63 and to the negative electrode of the second diode D2, the positive electrode of the second diode D2 is grounded, and the negative electrode of the first diode D1 is connected to the second low-pass filtering module 642. The rectification module 641 is configured to full-wave rectify the amplified ac signal to convert it into a pulsating dc voltage, and the second low-pass filtering module 642 is configured to filter the pulsating dc voltage to convert it into a smooth dc level signal.
(V) judgment Module
The judging module 65 includes a first triode N1, a second triode P1, a third current limiting resistor R8, a fourth current limiting resistor R16, a bias resistor R15, a fourth low-pass filtering module 651 and a controller U0; the base electrode of the first triode N1 is connected with the rectifying and filtering module 64 through the third current limiting resistor R8, the collector electrode of the first triode N1 is connected with the base electrode of the second triode P1 through the fourth current limiting resistor R16, and the emitter electrode of the first triode N1 is grounded; the emitter of the second triode P1 is connected with the working voltage and the base of the second triode P1 through the bias resistor R15, and the emitter of the second triode P1 is connected with the controller U0 through the fourth low-pass filter module 651. When the constant voltage power amplifier module 1 outputs the first audio signal, the rectifying and filtering module 64 sends a smooth dc level signal (high level signal) to the base of the first triode N1, and the first triode N1 is turned on, so that the second triode P1 is turned on and sends a high level signal to the input terminal IO1 of the controller U0, and further, the output terminal IO2 of the controller U0 sends a control signal to the converter 3, and the converter 3 controls the loudspeaker 4 to be communicated with the constant voltage power amplifier module 1 according to the control signal. In this embodiment, the controller U0 is preferably an MCU, but is not limited thereto, and can implement the above functions; the fixed-resistance power amplifier module 5 is preferably an embedded fixed-resistance power amplifier module 5 embedded in the MCU.
In summary, by adopting the embodiment of the utility model, the output of the power amplifier can be automatically turned off and stopped when the emergency broadcast is inserted, so that the emergency broadcast source can be played preferentially.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, such changes and modifications are also intended to be within the scope of the utility model.

Claims (10)

1. The emergency broadcast source priority playing circuit is characterized by comprising a constant voltage power amplification module, an audio step-down transformer, a converter, a loudspeaker, a constant resistance power amplification module and a detection module;
the constant voltage power amplifier module is connected with the loudspeaker through the audio step-down transformer and the converter in sequence and is used for outputting a first audio signal, the constant resistance power amplifier module is connected with the loudspeaker through the converter, and the converter is used for controlling the loudspeaker to be communicated with the constant voltage power amplifier module or the constant resistance power amplifier module;
the constant-voltage power amplifier module, the detection module and the converter are sequentially connected, the detection module is used for sending a control signal to the converter according to the first audio signal, and the converter is used for controlling the loudspeaker to be communicated with the constant-voltage power amplifier module according to the control signal.
2. The emergency broadcast source priority playing circuit of claim 1, wherein the detection module comprises a step-down module, a transformer, a signal amplification module, a rectifying and filtering module and a judging module which are connected in sequence;
the step-down module is connected with the constant-voltage power amplifier module, and the judging module is connected with the converter.
3. The emergency broadcast source priority playing circuit of claim 2, wherein the step-down module comprises a first step-down module and a second step-down module;
the positive output end of the constant voltage power amplifier module is connected with the first input end of the transformer through the first voltage reduction module, and the negative output end of the constant voltage power amplifier module is connected with the second input end of the transformer through the second voltage reduction module.
4. The emergency broadcast source priority playing circuit of claim 3, wherein the first buck module and the second buck module each comprise a plurality of buck resistors connected in parallel.
5. The emergency broadcast source priority playing circuit of claim 2, wherein the signal amplifying module comprises an operational amplifier, a filter capacitor, a divider resistor, a first current limiting resistor, a second current limiting resistor, a first low-pass filter module, a feedback resistor, a compensation capacitor, a protection module, an output resistor and an output capacitor;
the inverting input end of the operational amplifier is connected with the first output end of the transformer through the first current limiting resistor, the non-inverting input end of the operational amplifier is connected with the second output end of the transformer through the first low-pass filtering module and the second current limiting resistor in sequence, the first output end of the transformer is connected with the second output end of the transformer through the voltage dividing resistor, and the filtering capacitor is connected with the voltage dividing resistor in parallel;
the output end of the operational amplifier is connected with one end of the output resistor and is connected with the inverting input end of the operational amplifier through the feedback resistor, the compensation capacitor is connected with the feedback resistor in parallel, and the other end of the output resistor is connected with the rectifying and filtering module through the output capacitor and is connected with the inverting input end of the operational amplifier through the protection module.
6. The emergency broadcast source priority play out circuit of claim 5, wherein the first low pass filter module comprises a resistor and a resistor connected in parallel.
7. The emergency broadcast source priority play out circuit of claim 5, wherein the protection module comprises a first TVS diode and a second TVS diode;
the negative electrode of the first TVS diode is connected with the inverting input end of the operational amplifier, the positive electrode of the first TVS diode is connected with the positive electrode of the second TVS diode, and the negative electrode of the second TVS diode is connected with the other end of the output resistor.
8. The emergency broadcast source priority playing circuit of claim 2, wherein the rectifying and filtering module comprises a rectifying module and a second low-pass filtering module connected in sequence.
9. The emergency broadcast source priority playing circuit of claim 8, wherein the rectifying module comprises a first diode and a second diode;
the positive pole of first diode with signal amplification module is connected and with the negative pole of second diode is connected, the positive pole of second diode ground connection, the negative pole of first diode with the second low pass filter module is connected.
10. The emergency broadcast source priority playing circuit of claim 2, wherein the judging module comprises a first triode, a second triode, a third current limiting resistor, a fourth current limiting resistor, a bias resistor, a fourth low-pass filtering module and a controller;
the base electrode of the first triode is connected with the rectifying and filtering module through the third current limiting resistor, the collector electrode of the first triode is connected with the base electrode of the second triode through the fourth current limiting resistor, and the emitter electrode of the first triode is grounded;
the emitter of the second triode is connected with working voltage and the base of the second triode through the bias resistor, and the emitter of the second triode is connected with the controller through the fourth low-pass filter module.
CN202221806430.9U 2022-07-13 2022-07-13 Emergency broadcast source priority playing circuit Active CN219041793U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221806430.9U CN219041793U (en) 2022-07-13 2022-07-13 Emergency broadcast source priority playing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221806430.9U CN219041793U (en) 2022-07-13 2022-07-13 Emergency broadcast source priority playing circuit

Publications (1)

Publication Number Publication Date
CN219041793U true CN219041793U (en) 2023-05-16

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ID=86292852

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221806430.9U Active CN219041793U (en) 2022-07-13 2022-07-13 Emergency broadcast source priority playing circuit

Country Status (1)

Country Link
CN (1) CN219041793U (en)

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