Marine fog horn control circuit and marine electronic equipment

Abstract

The utility model discloses a marine fog horn control circuit and marine electronic equipment, the marine fog horn control circuit comprises an audio power amplifier module, a relay module, a relay coil, a first voltage dividing module, a second voltage dividing module, a switch module, a voltage stabilizing module and a control module, and the control module controls the on-off state of the relay module through the relay coil. According to the circuit, efficient control and real-time monitoring of the functions of the fog horn are realized, the circuit not only can ensure that the fog horn receives an audio signal and makes a sound normally in a normal state, but also can detect the connection state of the fog horn in real time, and when connection is abnormal, a problem can be quickly positioned, and the reliability of the fog horn is improved. Therefore, the reliability and the maintenance efficiency of the equipment are greatly improved, and the safe navigation of the ship under the condition of poor visibility is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of marine electronic technology especially relates to a marine fog horn control circuit and marine electronic equipment. BACKGROUND

[0002] With the rapid development of global shipping industry, the number of ships has increased significantly, and the traffic flow on the sea has also increased. However, the problem of navigation safety that follows is becoming more and more serious, especially in the poor visibility environment under bad weather conditions, the probability of ship collision accidents increases significantly. Ship safety navigation involves multiple key factors, including natural environment, skill level of operating personnel, and reliability of technical equipment, etc. Among them, the development and integrated application of technical equipment plays a crucial role in ship safety guarantee. Very high frequency (VHF) radio communication equipment is an indispensable important tool in ship navigation, in addition to being used for regular radio communication, it also integrates many key functions, such as D-class digital selective calling (DSC), weather alarm receiving, and fog horn function, etc. These functions significantly improve the safety and operation efficiency of ships under complex navigation conditions.

[0003] As an important additional function of VHF equipment, the main role of the fog horn is to remind surrounding ships through sound signals in foggy, night or other poor visibility conditions, so as to ensure a safe distance and avoid collision accidents. Especially when ships meet, enter or exit the port, and pass through busy waterways, the use of fog horn is particularly critical. In addition, modern fog horns also integrate the following additional functions:

[0004] Loud hailer function: crew members can speak through the handheld microphone on the VHF equipment, and the speaking voice is amplified by the equipment and transmitted through the fog horn, which usually has a power of more than 20W, used for efficient communication between ships.

[0005] Listen-back function: the fog horn has a microphone function, which can collect environmental sounds outside the ship and play them into the cabin through the speaker inside the VHF equipment. This function is particularly useful in a closed cabin, which helps crew members to understand the external environment in real time.

[0006] Although the fog horn has various functions and is widely used, its working environment is extremely harsh, usually installed outside the cabin, and needs to face high humidity, salt spray corrosion, extreme temperature changes, and vibration for a long time. Such environment can easily cause equipment aging, function failure or connection abnormality, and in severe cases, it may affect the safety of ship navigation. Therefore, it is particularly important to monitor the working status of the fog horn and its connection status with the VHF equipment in a timely manner.

[0007] At present, there is still lack of systematic and real-time technical solution for monitoring the functional state and connection state of the fog horn. Once the fog horn has functional abnormality or connection failure, the fault position usually needs to be checked by manual inspection, which not only consumes time and effort, but also is difficult to find the problem in time, which may cause the further expansion of the navigation safety hazard. Therefore, how to realize the real-time monitoring of the state of the fog horn through the VHF device, especially when the device connection is abnormal, and quickly locate the source of the problem, has become an urgent need for the development of current ship safety navigation technology. Practical new type content

[0008] The embodiment of the utility model provides a kind of marine fog horn control circuit and marine electronic equipment to solve above-mentioned technical problem.

[0009] The first aspect of the embodiment of the utility model provides a kind of marine fog horn control circuit, comprising:

[0010] Audio power amplifier module for sending audio signal;

[0011] Relay module, it includes first normally closed end, second normally closed end, first normally open end, second normally open end, first common end and second common end, the first normally open end is connected the first output end of audio power amplifier module, the second normally closed end is grounded, the second normally open end is connected the second output end of audio power amplifier module, the first common end is connected the first input end of fog horn, and the second common end is connected the second input end of fog horn;

[0012] Relay coil for controlling the switching of the switching state of the relay module;

[0013] First power supply for outputting first voltage;

[0014] First voltage dividing module, the first end of the first voltage dividing module receives the first voltage output by the first power supply, and the second end of the first voltage dividing module is grounded, for outputting second voltage from the third end of the first voltage dividing module after voltage division of the first voltage;

[0015] Second voltage dividing module, the first end of the second voltage dividing module receives the second voltage, and the second end of the second voltage dividing module is connected to the first normally closed end, for outputting third voltage from the third end of the second voltage dividing module after voltage division of the second voltage;

[0016] Switching module, its first end is connected to the third end of the first voltage dividing module, and its second end is connected to the third end of the second voltage dividing module, for conducting according to the difference between the second voltage and the third voltage and outputting fourth voltage through the third end or being in the off state;

[0017] a voltage stabilizing module, a first end of the voltage stabilizing module receiving the fourth voltage, the voltage stabilizing module being configured to output a fifth voltage after stabilizing the fourth voltage and outputting the fifth voltage through a second end of the voltage stabilizing module;

[0018] a control module, an output end of the control module being connected to an input end of the relay coil, an input end of the control module receiving the fifth voltage, the control module being configured to control a switching state of the relay module through the relay coil and obtain the connection state of the fog horn according to the fifth voltage.

[0019] Optionally, the first voltage dividing module comprises a first resistor, a second resistor and a first capacitor, a first end of the first resistor being the first end of the first voltage dividing module, a second end of the first resistor, a first end of the second resistor and a first end of the first capacitor being commonly connected as a third end of the first voltage dividing module, a second end of the second resistor and a second end of the first capacitor being commonly connected as a second end of the first voltage dividing module.

[0020] Optionally, the second voltage dividing module comprises a seventh resistor and an eighth resistor, a first end of the seventh resistor being the first end of the second voltage dividing module, a second end of the seventh resistor and a first end of the eighth resistor being commonly connected as a third end of the second voltage dividing module, a second end of the eighth resistor being the second end of the second voltage dividing module.

[0021] Optionally, the marine fog horn control circuit further comprises a third current limiting resistor, a first end of the third current limiting resistor being connected to the first normally closed end, a second end of the third current limiting resistor being connected to the second end of the second voltage dividing module.

[0022] Optionally, the voltage stabilizing module comprises a voltage stabilizing tube, a sixth resistor and a second capacitor, a cathode of the voltage stabilizing tube, a first end of the sixth resistor and a first end of the second capacitor being commonly connected as the first end and the second end of the voltage stabilizing module, an anode of the voltage stabilizing tube, a second end of the sixth resistor and a second end of the second capacitor being commonly connected to the ground.

[0023] Optionally, the marine fog horn control circuit further comprises a fourth current limiting resistor, a first end of the fourth current limiting resistor being connected to the third end of the switching module, a second end of the fourth current limiting resistor being connected to the first end of the voltage stabilizing module.

[0024] Optionally, the switching module is a PNP triode, an emitter of the PNP triode being the first end of the switching module, a base of the PNP triode being the second end of the switching module, a collector of the PNP triode being the third end of the switching module.

[0025] Optionally, the ship fog siren control circuit further comprises a diode, a second triode and a fifth resistor, a cathode of the diode is connected with the second power supply and a first end of the relay coil respectively, an anode of the diode is connected with a collector of the second triode and a second end of the relay coil respectively, an emitter of the second triode is grounded, a base of the second triode is connected with a first end of the fifth resistor, and a second end of the fifth resistor is connected with an output end of the control module.

[0026] Optionally, the ship fog siren control circuit further comprises a sound generating module, and an input end of the sound generating module is connected with the first normally closed end.

[0027] The utility model embodiment second aspect provides a kind of marine electronic equipment, including the ship fog siren control circuit and fog siren of first aspect described.

[0028] The technical effects of the embodiments of the present utility model are as follows: by integrating the audio power amplifier module, the relay module, the first voltage divider module, the second voltage divider module, the switch module, the voltage stabilizing module and the control module, efficient control and real-time monitoring of the fog siren function are realized. This circuit not only ensures that the fog siren receives audio signals and sounds normally in a normal state, but also can detect the connection state of the fog siren in real time. When there is a connection abnormality, the problem can be quickly located, and an alarm can be sent to the operator, thereby greatly improving the reliability and maintenance efficiency of the equipment and ensuring the safe navigation of the ship under poor visibility conditions. BRIEF DESCRIPTION OF DRAWINGS

[0029] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings needed in the description of the embodiments of the present utility model will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0030] Figure 1 is a first structural schematic diagram of a ship fog siren control circuit provided by the first embodiment of the present utility model;

[0031] Figure 2 is a second structural schematic diagram in a ship fog siren control circuit provided by the first embodiment of the present utility model;

[0032] Figure 3 is a circuit diagram of a ship fog siren control circuit provided by the first embodiment of the present utility model;

[0033] In the figure: 10, fog horn; 101, audio power amplifier module; 102, relay module; 103, relay coil; 104, first power supply; 105, first voltage division module; 106, second voltage division module; 107, switch module; 108, voltage stabilizing module; 109, control module; 110, sound production module. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0035] It should be understood that the present application can be implemented in different forms and should not be interpreted as being limited to the embodiments presented herein. On the contrary, these embodiments are presented in order to make the disclosure complete and complete and to fully convey the scope of the present application to those skilled in the art. In the drawings, the size and relative size of the layers and regions can be exaggerated for clarity throughout the same reference numerals represent the same elements.

[0036] It should be understood that when an element or layer is referred to as "on", "adjacent", "connected to", or "coupled to" another element or layer, it can be directly on, adjacent to, connected or coupled to the other element or layer, or there can be intervening elements or layers. Conversely, when an element is referred to as "directly on", "directly adjacent", "directly connected to", or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part without departing from the teachings of the present application.

[0037] In order to fully understand the present application, detailed structures and steps will be presented in the following description in order to explain the technical solutions presented by the present application. The preferred embodiments of the present application are described in detail as follows, however, in addition to these detailed descriptions, the present application can have other implementation manners.

[0038] Embodiment one

[0039] The embodiment one provides a marine fog horn control circuit, like Figure 1As shown, comprising:

[0040] An audio power amplifier module 101 for sending an audio signal;

[0041] A relay module 102, comprising a first normally closed terminal B1, a second normally closed terminal B3, a first normally open terminal B2, a second normally open terminal B4, a first common terminal B5 and a second common terminal B6, the first normally open terminal B2 is connected to the first output terminal of the audio power amplifier module 101, the second normally closed terminal B3 is grounded, the second normally open terminal B4 is connected to the second output terminal of the audio power amplifier module 101, the first common terminal B5 is connected to the first input terminal of the fog horn 10, and the second common terminal B6 is connected to the second input terminal of the fog horn 10;

[0042] A relay coil 103 for controlling the switching of the switching state of the relay module 102;

[0043] A first power supply 104 for outputting a first voltage;

[0044] A first voltage dividing module 105, the first end of the first voltage dividing module 105 receives the first voltage output by the first power supply 104, the second end of the first voltage dividing module 105 is grounded, and the third end of the first voltage dividing module 105 is used to output a second voltage after the first voltage is divided;

[0045] A second voltage dividing module 106, the first end of the second voltage dividing module 106 receives the second voltage, the second end of the second voltage dividing module 106 is connected to the first normally closed terminal, and the third end of the second voltage dividing module 106 is used to output a third voltage after the second voltage is divided;

[0046] A switch module 107, the first end of the switch module 107 is connected to the third end of the first voltage dividing module 105, the second end of the switch module 107 is connected to the third end of the second voltage dividing module 106, and the switch module 107 is used to conduct and output a fourth voltage through the third end according to the difference between the second voltage and the third voltage or be in an off state;

[0047] A voltage stabilizing module 108, the first end of the voltage stabilizing module 108 receives the fourth voltage, and the second end of the voltage stabilizing module 108 is used to output a fifth voltage after the fourth voltage is stabilized;

[0048] A control module 109, the output end of the control module 109 is connected to the input end of the relay coil 103, the input end of the control module 109 receives the fifth voltage, the control module 109 is used to control the switching state of the relay module 102 through the relay coil 103, and the connection state of the fog horn is obtained according to the fifth voltage.

[0049] The audio power amplifier module 101 is configured to amplify the input audio signal and output a high-power audio signal to drive the fog horn 10 to produce sound. The audio power amplifier module 101 receives the audio signal from the VHF device, amplifies the power of the audio signal, and then transmits the amplified audio signal to the first normally open terminal B2 and the second normally open terminal B4 of the relay module 102 through the output terminals (the first output terminal and the second output terminal). The relay module 102 switches the switching state of the internal contact according to the control signal to control whether the fog horn 10 receives the audio signal. The initial state of the relay module 102 is that the first normally closed terminal B1 is conductive with the first common terminal B5, and the second normally closed terminal B3 is grounded and conductive with the second common terminal B6. When the relay coil 103 is activated, the relay module 102 switches to the normally open state, the first normally open terminal B2 is conductive with the first common terminal B5, and the second normally open terminal B4 is conductive with the second common terminal B6, so that the signal of the audio power amplifier module 101 is transmitted to the input terminal of the fog horn. The relay coil 103 controls the switching state of the contact of the relay module 102. The relay coil 103 receives the control signal of the control module 109 and determines whether to be activated according to the signal strength, thereby controlling the relay module 102 to switch from the normally closed state to the normally open state. The first power supply 104 provides the initial voltage (the first voltage) required by the system. The first power supply 104 supplies power to the first voltage dividing module 105 to provide power input for the subsequent voltage processing and voltage stabilizing module 108. The first voltage dividing module 105 divides the first voltage and outputs the second voltage to supply the second voltage dividing module 106 and the switch module 107. After receiving the first voltage, the first voltage dividing module 105 generates a lower second voltage through a resistance voltage dividing network and outputs the second voltage from the third terminal to the subsequent circuit. The second voltage dividing module 106 further divides the second voltage to generate a third voltage for realizing the conduction and shutdown of the switch module 107. The second voltage dividing module 106 receives the second voltage from the first voltage dividing module 105, generates the third voltage through a voltage dividing network, and outputs the third voltage from the third terminal for the switch module 107. When the relay module 102 is in different switching states, the voltage distribution changes, thereby affecting the third voltage. The switch module 107 works according to the difference between the second voltage and the third voltage, controls whether to be conductive, and outputs the fourth voltage. According to the difference between the second voltage and the third voltage, if the difference meets the conduction condition, the switch module 107 is conductive and outputs the fourth voltage. If the difference is insufficient to trigger the conduction condition, the switch module 107 is in the shutdown state and does not output the voltage. The voltage stabilizing module 108 stabilizes the fourth voltage output by the switch module 107 to generate a stable fifth voltage. The voltage stabilizing module 108 receives the fourth voltage from the switch module 107, stabilizes the fourth voltage, filters out power fluctuations or noise, ensures that the output fifth voltage is constant, and outputs the fifth voltage for the control module 109 to detect. The control module 109 controls the working state of the relay coil 103, thereby realizing the switching state switching of the relay module 102, and judges the connection state of the fog horn according to the fifth voltage.The control module 109 receives the fifth voltage output by the voltage stabilizing module 108, analyzes the value of the fifth voltage, and determines whether the fog horn is normally connected or has a fault (such as an open circuit or a short circuit). If the fog horn is normally connected, a control signal is output to the relay coil 103 to activate the switch state of the relay module 102, so that the fog horn receives the audio signal and normally works. If an abnormal state (such as a connection interruption) is detected, an alarm signal is promptly sent to the operator or the abnormal state is recorded to ensure that the problem is quickly located and solved.

[0050] The technical effect of the technical solution provided by the embodiment one is that by integrating the audio power amplifier module, the relay module, the first voltage dividing module, the second voltage dividing module, the switch module, the voltage stabilizing module, and the control module, efficient control and real-time monitoring of the fog horn function are realized. The circuit not only ensures that the fog horn receives the audio signal and normally sounds in a normal state, but also can detect the connection state of the fog horn in real time. When a connection abnormality occurs, the problem can be quickly located, and an alarm can be sent to the operator, thereby greatly improving the reliability and maintenance efficiency of the equipment and ensuring the safe navigation of the ship in poor visibility conditions.

[0051] As an implementation manner, as shown in Figure 2 The fog horn control circuit for ships further includes a sound producing module 110, and an input end of the sound producing module 110 is connected to the first normally closed end B1.

[0052] The main function of the sound producing module 110 is to receive the sound signal (electrical signal) collected by the fog horn 10 (when acting as a microphone), convert it into audible sound, and play it out through the loudspeaker thereof. When the fog horn 10 works in the microphone mode (the relay module 102 is in the normally closed state), the sound producing module 110 can restore and play the environmental sound (such as a whistle sound, a shouting sound, etc.) outside the ship cabin to the crew, thereby improving the crew's perception ability of the external environment, which is particularly important in a closed bridge cabin. The sound producing module 110 can also help the crew to monitor whether the microphone function of the fog horn 10 is normal, and determine the equipment state by the quality (such as distortion or no sound) of the played sound. The working process is as follows: when the relay module 102 is in the initial state (the normally closed state), the first input end of the fog horn 10 (working as a microphone) is conductive to the first normally closed end B1 of the relay module 102, and the collected sound signal is transmitted to the input end of the sound producing module 110 through the first normally closed end B1. The fog horn 10 converts the external environmental sound into corresponding electrical signals and transmits them to the sound producing module 110 through the cable. After receiving the electrical signals, the sound producing module 110 processes the signals through the internal circuit (such as a signal amplification and filtering circuit) thereof to ensure that the output sound signal is clear and accurate. The processed signal is converted into audible sound by the loudspeaker of the sound producing module 110 and played, so that the crew can perceive the dynamic sound of the external environment in real time.

[0053] The technical effect of the embodiment is that the sound generating module, through cooperation with the fog horn, not only improves the real-time performance and reliability of safe navigation of the ship, but also enhances the interconnection perception ability of the environment inside and outside the cockpit, and is especially suitable for complex navigation environments (such as foggy days or high-noise areas). This design provides comprehensive environmental feedback for the crew, which helps to make quick navigation decisions

[0054] As an embodiment, as shown in Figure 3 The marine fog horn control circuit includes a fog horn connection state detection circuit, and the fog horn connection state detection circuit includes a first voltage division module 105, a second voltage division module 106, a switch module 107, and a voltage stabilizing module 108.

[0055] The first voltage division module 105 includes a first resistor R1, a second resistor R2, and a first capacitor C1. The first end of the first resistor R1 is the first end of the first voltage division module 105. The second end of the first resistor R1, the first end of the second resistor R2, and the first end of the first capacitor C1 are commonly connected as the third end of the first voltage division module 105. The second end of the second resistor R2 and the second end of the first capacitor C1 are commonly connected as the second end of the first voltage division module 105.

[0056] The second voltage division module 106 includes a seventh resistor R7 and an eighth resistor R8. The first end of the seventh resistor R7 is the first end of the second voltage division module 106. The second end of the seventh resistor R7 and the first end of the eighth resistor R8 are commonly connected as the third end of the second voltage division module 106. The second end of the eighth resistor R8 is the second end of the second voltage division module 106.

[0057] The fog horn connection state detection circuit further includes a third current limiting resistor R3. The first end of the third current limiting resistor R3 is connected to the first normally closed end. The second end of the third current limiting resistor R3 is connected to the second end of the second voltage division module 106.

[0058] The voltage stabilizing module 108 includes a voltage stabilizing tube D1, a sixth resistor R6, and a second capacitor C2. The cathode of the voltage stabilizing tube D1, the first end of the sixth resistor R6, and the first end of the second capacitor C2 are commonly connected as the first end and the second end of the voltage stabilizing module 108. The anode of the voltage stabilizing tube D1, the second end of the sixth resistor R6, and the second end of the second capacitor C2 are commonly connected to the ground.

[0059] The fog horn connection state detection circuit further includes a fourth current limiting resistor R4. The first end of the fourth current limiting resistor R4 is connected to the third end of the switch module 107. The second end of the fourth current limiting resistor R4 is connected to the first end of the voltage stabilizing module 108.

[0060] The switch module 107 is a PNP triode Q1, the emitter of the PNP triode Q1 is the first end of the switch module 107, the base of the PNP triode Q1 is the second end of the switch module 107, and the collector of the PNP triode Q1 is the third end of the switch module 107.

[0061] The marine fog horn control circuit further comprises a diode D2, a second triode Q2 and a fifth resistor R5, the cathode of the diode D2 is connected to the first end of the second power supply E and the first end of the relay coil 103 respectively, the anode of the diode D2 is connected to the collector of the second triode Q2 and the second end of the relay coil 103 respectively, the emitter of the second triode Q2 is grounded, the base of the second triode Q2 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the output end of the control module 109.

[0062] The fog horn has two functions, one is used as a sound playing device, such as playing fog whistle, fog horn and other warning sounds, or used as a caller for shouting outside, and the fog horn itself is only a sound playing device. The second is used as a sound receiving device, that is, similar to the function of a microphone, which is applied in the listening function.

[0063] The switching of the two functions of the fog horn is realized by using a relay module in the internal circuit design of the VHF. When the fog horn is used as a sound receiving device, the relay module is in a normally closed state, that is, the first common end 11 is connected to the first normally closed end 12, the second common end 21 is connected to the second normally closed end 22, the second common end 21 is grounded, and the first power supply VCC passes through the first resistor R1, the PNP triode Q1, the third resistor R3, and then passes through the first common end 11 and the first normally closed end 12 to provide a bias voltage to the other foot of the fog horn L, and the fog horn L is used as a microphone to convert the collected sound signals into electrical signals and transmit them to the listening output. When the fog horn L is used as a sound playing device, the MCU needs to set the signal output by the port SW to high, turn on the second triode Q2, and provide current to the input ends A1 and A2 of the relay coil, and the internal magnetic attraction of the relay module cuts the normally closed end to the normally open end, that is, at this time, the first common end 11 of the relay module is connected to the first normally open end 14, and the second common end 21 is connected to the second normally open end 24. The output of the audio power amplifier module of the VHF is directly connected to the two input ends of the fog horn L, and the electrical signal of the output of the audio power amplifier module is directly converted into a sound signal and played out by the fog horn L.

[0064] The state detection circuit of the marine fog horn provided in the technical solution is applied to the VHF wireless device, and when the fog horn is used as a sound receiving device, the connection state detection circuit is started simultaneously:

[0065] When the fog horn L and the VHF wireless device are connected normally, the first power supply VCC is divided by the first resistor R1 and the second resistor R2 to obtain a voltage slightly greater than the voltage supplied to the MCU by about 0.7V. The voltage is applied between the emitter stage and the base of the PNP transistor Q1 through the seventh resistor R7 and the eighth resistor R8. The base stage of the PNP transistor Q1 is connected to the first normally closed end 12 of the relay module through the third resistor R3. At this time, the control signal output from the MCU output end SW is low, that is, the second transistor Q2 is not conductive, the relay coil has no current passing through, the magnetic attraction does not work, and the relay module is in the normally closed state. The first common end 11 and the first normally closed end 12 are connected, the second common end 21 and the second normally closed end 22 are connected, and the fog horn L works in the sound receiving state. At this time, the fog horn L and the VHF wireless device are connected normally, that is, the fog horn L is connected to the first common end 11 and the second common end 21 of the relay module, and the direct current equivalent of the fog horn L itself is a resistor. The impedance of the fog horn L is generally 4 ohms or 8 ohms. Therefore, for the direct current equivalent, the first common end 11 and the second common end 21 of the relay module are connected through a 4 ohm or 8 ohm resistor. At this time, the third resistor R3 is connected to the first normally closed end 12 of the relay module, the normally closed switch is connected to the first common end 11, and then passes through the equivalent impedance 4 ohm or 8 ohm of the fog horn L to the second common end 21 of the relay module. The normally closed switch is connected to the second normally closed end 22 and finally to GND. That is, there is a path from the base stage of the PNP transistor Q1 to the ground, so that the Veb of the first transistor Q1 has a bias voltage, so that the Vec of the PNP transistor Q1 is punched through. Therefore, the voltage after the first power supply VCC is divided by the first resistor R1 and the second resistor R2 will be transmitted to the fourth resistor R4, and the fourth resistor R4 and the zener diode D1 are protected. At this time, the voltage input to the MCU does not exceed the IO port voltage of the MCU, so that the DET input port has a high level input, that is, the DET of the MCU detects a high level. This level represents that the connection state of the fog horn L and the VHF is normal.

[0066] 2. When the fog horn L and the VHF wireless device are connected abnormally, the two ports of the fog horn L are connected to the VHF device. Regardless of whether one of the ports is disconnected or both ports are disconnected, the first common end 11 and the second common end 21 of the relay module are in a disconnected state. That is, the base stage of the PNP transistor Q1 is connected to the first normally closed end 12 of the relay module through the third resistor R3 at this time, which is in a disconnected state and has no path to GND. At this time, the Vcb of the PNP transistor Q1 is 0V, that is, the C stage and the E stage of the PNP transistor Q1 are in a disconnected state. Therefore, the voltage at the DET end is low (L), that is, the DET of the MCU detects a low level. This level represents that the connection state of the fog horn and the VHF is abnormal. At this time, the fog horn L cannot be used as a sound device, the fog horn L stops working, and the function of protecting the audio power amplifier circuit is realized.

[0067] Embodiment Two

[0068] Embodiment Two provides a marine electronic device, including the marine fog horn control circuit and the fog horn of embodiment one.

[0069] The above embodiments are only used to illustrate the technical solutions of the present application, but not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A control circuit for a marine fog horn, characterized in that, include: Audio amplifier module, used to send audio signals; The relay module includes a first normally closed terminal, a second normally closed terminal, a first normally open terminal, a second normally open terminal, a first common terminal, and a second common terminal. The first normally open terminal is connected to the first output terminal of the audio power amplifier module, the second normally closed terminal is grounded, the second normally open terminal is connected to the second output terminal of the audio power amplifier module, the first common terminal is connected to the first input terminal of the fog horn, and the second common terminal is connected to the second input terminal of the fog horn. A relay coil is used to control the switching of the relay module's switching state; The first power source is used to output the first voltage; The first voltage divider module has a first terminal that receives the first voltage output from the first power supply and a second terminal that is grounded. It is used to divide the first voltage and output a second voltage from the third terminal of the first voltage divider module. The second voltage divider module has a first terminal that receives the second voltage and a second terminal that is connected to the first normally closed terminal. It is used to divide the second voltage and output a third voltage from the third terminal of the second voltage divider module. A switching module, with its first terminal connected to the third terminal of the first voltage divider module and its second terminal connected to the third terminal of the second voltage divider module, is used to turn on the voltage according to the difference between the second voltage and the third voltage and output a fourth voltage through the third terminal or to be in a turned-off state. A voltage regulator module, whose first terminal receives the fourth voltage and is used to regulate the fourth voltage and then output a fifth voltage through the second terminal; The control module has its output terminal connected to the input terminal of the relay coil, and its input terminal receives the fifth voltage. It is used to control the switching state of the relay module through the relay coil, and to obtain the connection state of the fog horn based on the fifth voltage.

2. The marine fog horn control circuit as described in claim 1, characterized in that, The first voltage divider module includes a first resistor, a second resistor, and a first capacitor. The first end of the first resistor is the first end of the first voltage divider module. The second end of the first resistor, the first end of the second resistor, and the first end of the first capacitor are all connected to the third end of the first voltage divider module. The second end of the second resistor and the second end of the first capacitor are all connected to the second end of the first voltage divider module.

3. The marine fog horn control circuit as described in claim 1, characterized in that, The second voltage divider module includes a seventh resistor and an eighth resistor. The first end of the seventh resistor is the first end of the second voltage divider module. The second end of the seventh resistor and the first end of the eighth resistor are connected together to form the third end of the second voltage divider module. The second end of the eighth resistor is the second end of the second voltage divider module.

4. The marine fog horn control circuit as described in claim 3, characterized in that, The marine fog horn control circuit also includes a third current-limiting resistor, the first end of which is connected to the first normally closed terminal, and the second end of which is connected to the second terminal of the second voltage divider module.

5. The marine fog horn control circuit as described in claim 1, characterized in that, The voltage regulator module includes a Zener diode, a sixth resistor, and a second capacitor. The cathode of the Zener diode, the first end of the sixth resistor, and the first end of the second capacitor are connected together as the first and second ends of the voltage regulator module. The anode of the Zener diode, the second end of the sixth resistor, and the second end of the second capacitor are connected together to ground.

6. The marine fog horn control circuit as described in claim 5, characterized in that, The marine fog horn control circuit also includes a fourth current-limiting resistor, the first end of which is connected to the third end of the switching module, and the second end of which is connected to the first end of the voltage regulator module.

7. The marine fog horn control circuit as described in any one of claims 1 to 6, characterized in that, The switching module is a PNP transistor, with the emitter of the PNP transistor being the first terminal of the switching module, the base of the PNP transistor being the second terminal of the switching module, and the collector of the PNP transistor being the third terminal of the switching module.

8. The marine fog horn control circuit as described in claim 1, characterized in that, The marine fog horn control circuit also includes a diode, a second transistor, and a fifth resistor. The cathode of the diode is connected to the second power supply and the first end of the relay coil, respectively. The anode of the diode is connected to the collector of the second transistor and the second end of the relay coil, respectively. The emitter of the second transistor is grounded. The base of the second transistor is connected to the first end of the fifth resistor. The second end of the fifth resistor is connected to the output terminal of the control module.

9. The marine fog horn control circuit as described in claim 1, characterized in that, The marine fog horn control circuit also includes a sound-generating module, the input of which is connected to the first normally closed terminal.

10. A marine electronic device, characterized in that, Includes the marine fog horn control circuit and fog horn as described in any one of claims 1 to 9.

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