A controlled power output audio switch based on relay control

Abstract

The utility model provides a controlled power output audio frequency switch based on relay control technology, it includes: control module and with its connection power output control module, power output control module is connected with the fixed voltage power amplifier equipment of campus broadcast system, power output control module includes: interconnection photoelectric coupling element and switch, the input side connection control module of photoelectric coupling element, switch includes two ports, one port receives power voltage, and the other end port output power voltage is connected with fixed voltage power amplifier equipment, the utility model discloses the switch state of switch through photoelectric coupling element to control, thereby realizes the automation control to the fixed voltage power amplifier equipment start -stop state of campus broadcast system.

Description

Technical Field

[0001] This utility model relates to the field of emergency broadcasting, and in particular to a controlled power output audio switcher based on relay control. Background Technology

[0002] Emergency broadcasting has been included in the national basic public service system and incorporated into emergency management and disaster prevention and mitigation systems at all levels. As an important vehicle for improving modern governance capabilities, its development and improvement are required to be further accelerated. Currently, the emergency broadcasting system mainly covers vast rural areas. With further development, urban public places such as schools are also required to be included in the emergency broadcasting coverage. In the event of major natural disasters, emergencies, or public health and social security crises, the system must deliver disaster information and potential hazards to the public as quickly as possible.

[0003] Connecting the emergency broadcasting system with the campus broadcasting system can avoid the problems of fragmentation and independence that exist in campus broadcasting due to its independent construction, closed system, and internal use, which makes it difficult to achieve the rapid dissemination of emergency information to the public.

[0004] The emergency broadcasting system needs to interface with the campus broadcasting system to simultaneously handle both emergency broadcasts and the school's daily broadcasting needs. The interface method involves adding an audio switcher to selectively switch and broadcast the input audio. Furthermore, when selecting an audio signal for broadcast, the constant voltage amplifier in the campus broadcasting system can be powered on simultaneously to drive speakers and other terminals.

[0005] Currently, campus broadcasting systems generally handle daily teaching activities, public information dissemination, and announcements of specific matters. They are maintained and operated by designated personnel and can only perform relatively simple scheduled tasks. Emergency broadcasts are characterized by their temporary, urgent, and unpredictable nature. While emergency broadcasting systems interface with the campus broadcasting system, even after receiving an emergency broadcast message, the campus broadcasting system still requires manual activation of its constant-voltage amplifier. Due to limitations in personnel operation and working hours, timely and effective broadcasting of emergency messages is not possible. Furthermore, current audio switchers lack controllable power output functionality. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, this utility model provides a controlled power output audio switcher based on relay control technology.

[0007] To achieve the above objectives, this utility model provides a controlled power output audio switcher based on relay control, comprising: a control module and a power output control module connected thereto, wherein the power output control module is connected to a constant voltage power amplifier device of a campus broadcasting system; the power output control module includes: interconnected optocouplers and a switching switch, wherein the input side of the optocouplers is connected to the control module, and the switching switch includes two ports, one port receiving power supply voltage and the other port outputting power supply voltage and connected to the constant voltage power amplifier device.

[0008] Preferably, the optocoupler is an optocoupler of model PC817.

[0009] Preferably, one end of the input side of the optocoupler is connected to a 5V power supply, and the other end is connected to the control module; one end of the output side of the optocoupler is connected to a switching switch, and the other end is grounded.

[0010] Preferably, the switch is an AC relay with the model number SZR-MY4-N1-AC220V.

[0011] Preferably, the switch also includes a power supply terminal connected to a 12V power supply; the switch also includes another output terminal connected to an optocoupler; the power supply voltage received by the switch is 220V.

[0012] Preferably, the audio switcher further includes an audio receiving module connected to the control module and used to receive emergency broadcasts and campus broadcasts, as well as an audio output module.

[0013] The present invention provides a controlled power output audio switcher based on relay control technology, the advantages of which are as follows:

[0014] 1. By adding a controllable power output function to the audio switcher, the timeliness of emergency broadcast message broadcasting tasks in the campus broadcasting system is effectively solved. The circuit design of this controllable power output function realizes circuit stability and high power output, expanding and enriching the application scenarios of the audio switcher.

[0015] 2. The added power output control module incorporates optocouplers to prevent high-voltage current from entering low-voltage circuits and burning out the chips, effectively improving the reliability of the audio switcher. The power output control module also features a switch that allows for switching the operating state of the constant-voltage amplifier based on the type of broadcast received, thus resolving the issue of delayed emergency broadcast messages caused by the need for manual activation of the constant-voltage amplifier in campus broadcasting systems. Attached Figure Description

[0016] Figure 1A schematic diagram of the connection between a controlled power output audio switcher based on relay control technology and a constant voltage supplier for a campus broadcasting system is provided for this utility model.

[0017] Figure 2 A functional block diagram of a controlled power output audio switcher based on relay control technology provided by this utility model;

[0018] Figure 3 The schematic diagram of the power output control module in a controlled power output audio switcher based on relay control technology provided by this utility model. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0022] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of this utility model may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0023] Relay control technology refers to the following: Electromagnetic relays are generally composed of an iron core, coil, armature, and contact springs. When a certain voltage is applied across the coil, a certain current flows through the coil, generating an electromagnetic effect. Under the attraction of the electromagnetic force, the armature overcomes the tension of the return spring and is attracted to the iron core, thus causing the moving contact of the armature to engage with the stationary contact (normally open contact). When the coil is de-energized, the electromagnetic attraction disappears, and the armature returns to its original position under the reaction force of the spring, releasing the moving contact from the original stationary contact (normally closed contact). This engagement and disengagement achieves the purpose of connecting and disconnecting the circuit.

[0024] To address the issue of current audio switchers being unable to switch playback promptly and effectively based on emergency broadcasts and campus broadcasts, such as... Figures 1-3 As shown, this utility model provides a controlled power output audio switcher based on relay control technology, applied to an audio switcher device. It includes: a control module and a power output control module connected thereto. The power output control module is connected to the constant voltage power amplifier device of a campus broadcasting system. The power output control module includes: interconnected optocouplers and a switching switch. The input side of the optocouplers is connected to the control module. The switching switch includes two ports. One port receives the power supply voltage, and the other port outputs the power supply voltage and is connected to the constant voltage power amplifier device.

[0025] In this invention, a control module acquires external campus broadcast signals, emergency broadcast signals, and other inserted signals. It identifies and processes the received broadcast signals and ultimately outputs corresponding control signals to the power output control module. The power output control module determines whether to control the constant-voltage amplifier in the campus broadcast system based on the audio control signal sent by the control module—whether it's emergency broadcast audio or campus broadcast audio. This achieves automatic control of the constant-voltage amplifier in the campus broadcast system. By switching the state of the constant-voltage amplifier, emergency broadcast messages can be broadcast promptly and effectively.

[0026] Specifically, when an emergency broadcast message needs to be broadcast through the campus broadcast system, the power output control module is connected to a 220V power supply. It outputs 220V AC power to the constant-voltage power amplifier of the campus broadcast system, putting the amplifier into operation. After the emergency broadcast is completed, the 220V AC power output is cut off, shutting down the amplifier. This effectively solves the problem of delayed emergency broadcasts caused by the need to manually turn on the constant-voltage power amplifier.

[0027] In this embodiment, when an emergency broadcast message needs to be broadcast, the power output control module controls the switching switch to close via an optocoupler. At this time, the power output control module outputs 220V AC voltage to the constant voltage power amplifier, thus turning on the device. When the emergency broadcast message broadcast ends, the control module controls the switching switch to open via the optocoupler (i.e., the two contact ports open), cutting off the 220V AC voltage output to the constant voltage power amplifier, thus turning off the device. This design, by controlling the 220V switching switch via optocoupler, effectively isolates high-voltage and low-voltage circuits, preventing high-voltage current from entering the low-voltage circuit and burning out the chips.

[0028] The optocoupler is a PC817 optocoupler; the switch is an AC relay, model SZR-MY4-N1-AC220V, which can stably output a 220V AC power supply with a rated current of 3A. The design parameters for the optocoupler are shown in Table 1. The design parameters for the AC relay are shown in Table 2.

[0029] Input diode forward voltage 1.25V Maximum collector current 50mA Descent time 18μs Ascent Time 18μs Cutoff frequency 80kHz Maximum power consumption 200mW High isolation voltage between input and output 5.0kV Operating temperature range -30 to 100℃

[0030] Table 1

[0031] Relay contact type 4FORM C(4PDT-NO, NC) Contact current rating 3A Switching voltage 250VAC, 125VAC coil resistance 12.9kOhms Coil current 5.8mA Power consumption 1.1W

[0032] Table 2

[0033] In this embodiment, one end of the input side of the optocoupler is connected to a 5V power supply, and the other end is connected to the control module; one end of the output side of the optocoupler is connected to a switching switch, and the other end is grounded. The switching switch also includes a power supply terminal connected to a 12V power supply; the switching switch also includes another output terminal connected to the optocoupler; the power supply voltage received by the switching switch is 220V.

[0034] like Figure 3As shown, the operating current of the optocoupler U1 flows from top to bottom on its input side. When an emergency broadcast message needs to be broadcast, the MCU in the control module outputs a low level, the primary circuit of the optocoupler U1 is turned on, and the primary LED illuminates, driving the secondary phototransistor to turn on. At this time, the AC relay U2 is powered by the 12V power supply, generating a driving current that turns on the AC relay U2. Its two ports connected to the 220V power supply are closed, and the power output control module can then output 220V power to supply power to the constant voltage power amplifier (constant voltage power amplifier) ​​of the campus broadcast system, thus turning on the constant voltage power amplifier. Conversely, when the emergency broadcast message broadcast task ends, the MCU in the control module outputs a high level, no current flows through the input side of the optocoupler U1, causing its output phototransistor to be in the off state. The AC relay U2 has no driving current, disconnects from the 220V power supply, and the constant voltage power amplifier stops working.

[0035] In this embodiment, the audio switcher further includes an audio receiving module connected to the control module and used to receive emergency broadcasts and campus broadcasts, as well as an audio output module.

[0036] Specifically, after receiving information such as inserted broadcast information, emergency or campus broadcast audio, the control module identifies the received audio and outputs the corresponding control level to the power output control module to control the working state of the constant voltage power amplifier and output the corresponding audio (specific emergency broadcast or campus broadcast content).

[0037] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort should fall within the protection scope of this utility model.

Claims

1. A controlled power output audio switcher based on relay control, characterized in that, include: A control module and a power output control module connected thereto, wherein the power output control module is connected to the constant voltage power amplifier of the campus broadcasting system; The power output control module includes interconnected optocouplers and a switching device. The input side of the optocouplers is connected to the control module. The switching device has two ports: one port receives the power supply voltage, and the other port outputs the power supply voltage and is connected to a constant voltage power amplifier.

2. The controlled power output audio switcher based on relay control according to claim 1, characterized in that, The optocoupler is an optocoupler, model number PC817.

3. The controlled power output audio switcher based on relay control according to claim 2, characterized in that, One end of the input side of the optocoupler is connected to a 5V power supply, and the other end is connected to the control module; one end of the output side of the optocoupler is connected to a switching switch, and the other end is grounded.

4. The controlled power output audio switcher based on relay control according to claim 1, characterized in that, The switching switch is an AC relay, model SZR-MY4-N1-AC220V.

5. The controlled power output audio switcher based on relay control according to claim 4, characterized in that, The switching switch also includes a power supply terminal connected to a 12V power supply; the switching switch also includes another output terminal connected to an optocoupler; the power supply voltage received by the switching switch is 220V.

6. The controlled power output audio switcher based on relay control according to claim 1, characterized in that, The audio switcher also includes an audio receiving module connected to the control module for receiving emergency broadcasts and campus broadcasts, as well as an audio output module.

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