Alternating current and direct current automatic switching circuit for aviation communication meteorological information terminal

Abstract

The utility model relates to the technical field of aeronautical communication and meteorological information terminals, and discloses an AC / DC automatic switching circuit for an aeronautical communication meteorological information terminal, which comprises an AC input end X1; a direct current input end X2; the input end of the AC-DC conversion module U1 is connected to the AC input end X1, and the output end of the AC-DC conversion module U1 provides DC level; the common cathode diode V1 is used for selecting direct current output with higher level from the AC-DC conversion module U1 and the direct current input end X2; and the output end X3 is connected to the output of the common cathode diode V1 and is used for providing power for a post-stage circuit. The seamless power supply switching effect is realized: through the cooperation of the AC-DC module of the U1, the diode V1 and the filter circuits of the L1, the C1 and the C2, the system is ensured to preferentially use the AC power supply to supply power when the AC power supply exists. When the alternating-current power supply is powered off, the circuit can be automatically switched to the direct-current battery for power supply, so that the power supply of a post-stage circuit is not interrupted, and the reliability of the system is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation communication and meteorological information terminals, in particular to an AC / DC automatic switching circuit for aviation communication and meteorological information terminals. Background Art

[0002] With the widespread application of aviation communication and meteorological information terminal equipment in the aviation field, the demand for its reliability and continuous operation has become increasingly important. In the design of the power supply system of these devices, the stability and reliability of the power supply are crucial. In the prior art, a single AC power supply or DC power supply is usually used for power supply, or a simple manual switching method is used to achieve power supply conversion. However, these solutions have many problems in practical applications, especially in scenarios where the power supply is unstable or frequent power switching is required, and their shortcomings are particularly obvious. Manual power switching or simple relay switching methods are used, and voltage interruptions or voltage fluctuations are prone to occur during the power switching process, resulting in temporary power outages or abnormal operation of the terminal equipment. This situation may cause data loss or communication interruption in aviation communication and meteorological information terminal equipment, affecting the normal operation of the equipment. When the AC power supply is cut off or the voltage fluctuates, the system cannot switch to the DC power supply quickly and smoothly, resulting in voltage interruption. This voltage interruption may not only cause a temporary power outage of the equipment, but also impact the electronic components inside the equipment, shorten their service life, and even cause equipment failure.

[0003] Therefore, we propose an AC / DC automatic switching circuit for aviation communication meteorological information terminal. Utility Model Content

[0004] The utility model mainly solves the above-mentioned existing technical problems and provides an AC / DC automatic switching circuit for aviation communication meteorological information terminal.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: an AC / DC automatic switching circuit for aviation communication meteorological information terminal, comprising:

[0006] AC input terminal X1;

[0007] DC input terminal X2;

[0008] The AC-DC conversion module U1 has an input terminal connected to the AC input terminal X1 and an output terminal providing a DC level;

[0009] The common cathode diode V1 is used to select a higher level DC output from the AC-DC conversion module U1 and the DC input terminal X2;

[0010] The output terminal X3 is connected to the output of the common cathode diode V1 and is used to provide power to the subsequent circuit;

[0011] A filter circuit, including an inductor L1 and capacitors C1 and C2, is connected between a DC input terminal X2 and a common cathode diode V1;

[0012] The two input ends of the common cathode diode V1 are respectively connected to the output of the AC-DC conversion module U1 and the output of the filter circuit, and the output end is connected to the output end X3.

[0013] As a preferred solution, when the output level of the AC-DC conversion module U1 is higher than the level of the DC input terminal X2, the AC-DC conversion module U1 provides power, and the power is transmitted to the output terminal X3 through the corresponding diode of the common cathode diode V1.

[0014] As a preferred solution, when the AC input terminal X1 is disconnected and the AC-DC conversion module U1 stops outputting, power is provided by the DC input terminal X2 through a filter circuit and another diode of the common cathode diode V1, ensuring that the level of the output terminal X3 will not suddenly drop due to the disconnection of the AC input.

[0015] As a preferred solution, the filter circuit is used to reduce voltage fluctuations and noise during power switching to ensure stable operation of subsequent circuits.

[0016] As a preferred solution, the common cathode diode V1 realizes seamless switching between AC and DC input.

[0017] As a preferred solution, the common cathode diode V1 is preferably a high-speed switching diode.

[0018] Beneficial Effects

[0019] The utility model is beneficial in that:

[0020] 1. This AC-DC automatic switching circuit for aviation communication meteorological information terminal achieves the effect of seamless power switching: through the cooperation of U1's AC-DC module, V1 diode, and L1, C1, C2's filter circuit, it ensures that when AC power is available, the system will give priority to AC power supply. When the AC power is cut off, the circuit can automatically switch to DC battery power supply to ensure that the power supply of the subsequent circuit is not interrupted, which greatly improves the reliability of the system.

[0021] 2. This AC / DC automatic switching circuit for aviation communication meteorological information terminal provides the effect of stable voltage output:

[0022] The combination of AC-DC conversion module and filter circuit ensures the stability of output voltage. The voltage drop characteristics of the diode maintain the output voltage within the normal operating range during the power switching process, avoiding the impact of voltage drop on the system and ensuring the normal operation of the terminal equipment.

[0023] 3. The AC / DC automatic switching circuit for aviation communication meteorological information terminal has the effect of simple and reliable circuit design:

[0024] A small number of key components, such as the U1 AC-DC module, V1 diode, L1, C1, and C2 filter circuits, form a simple and efficient power switching circuit. The simple design reduces possible failure points, improves system reliability and ease of maintenance, and reduces overall costs.

[0025] 4. The AC / DC automatic switching circuit used in aviation communication meteorological information terminal has the effect of extending the battery life:

[0026] In the design of giving priority to the use of AC power, the DC battery is only used as a backup power source. When the AC power is available, the consumption of the battery is reduced, the battery life is extended, and the economy of the system is effectively improved.

[0027] 5. The AC / DC automatic switching circuit for aviation communication meteorological information terminal has the effects of flexibility and scalability:

[0028] The design scheme can adjust the parameters of the diode and filter circuit according to specific needs, adapt to different input voltage ranges and battery types, and meet the needs of a wider range of application scenarios.

[0029] 6. The AC / DC automatic switching circuit for aviation communication meteorological information terminal provides circuit protection effect:

[0030] The unidirectional conduction characteristic of the diode effectively prevents reverse current between power sources, protects the battery and AC power module, avoids possible damage, and further improves the safety and reliability of the system.

[0031] 7. The AC / DC automatic switching circuit used in aviation communication meteorological information terminal has the following effects in adapting to harsh environments:

[0032] It is particularly suitable for use in environments with unstable power supply or frequent switching requirements such as offshore drilling platforms, providing 24-hour reliable power support to ensure the normal operation of aviation communication and meteorological monitoring terminal equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0034] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0035] Figure 1 This is the utility model. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Embodiment: An AC / DC automatic switching circuit for aviation communication meteorological information terminal, such as Figure 1 As shown,

[0038] AC input terminal X1;

[0039] DC input terminal X2;

[0040] The AC-DC conversion module U1 has an input terminal connected to the AC input terminal X1 and an output terminal providing a DC level;

[0041] The common cathode diode V1 is used to select a higher level DC output from the AC-DC conversion module U1 and the DC input terminal X2;

[0042] The output terminal X3 is connected to the output of the common cathode diode V1 and is used to provide power to the subsequent circuit;

[0043] A filter circuit, including an inductor L1 and capacitors C1 and C2, is connected between a DC input terminal X2 and a common cathode diode V1;

[0044] The two input ends of the common cathode diode V1 are respectively connected to the output of the AC-DC conversion module U1 and the output of the filter circuit, and the output end is connected to the output end X3.

[0045] Furthermore, when the output level of the AC-DC conversion module U1 is higher than the level of the DC input terminal X2, the AC-DC conversion module U1 provides power, and the power is transmitted to the output terminal X3 through the corresponding diode of the common cathode diode V1.

[0046] Furthermore, when the AC input terminal X1 is disconnected and the AC-DC conversion module U1 stops outputting, power is provided by the DC input terminal X2 through the filter circuit and another diode of the common cathode diode V1, ensuring that the level of the output terminal X3 will not suddenly drop due to the disconnection of the AC input.

[0047] Furthermore, the filter circuit is designed to reduce voltage fluctuations and noise during power switching to ensure stable operation of subsequent circuits.

[0048] Furthermore, it is characterized in that the common cathode diode V1 is used to achieve seamless switching between AC and DC inputs, thereby solving the delay problem that may occur during the power switching process, simplifying the circuit design, and reducing the production cost.

[0049] Furthermore, the common cathode diode V1 is preferably a high-speed switching diode to improve the switching speed and efficiency to meet the high requirements of the aviation communication meteorological information terminal on power supply stability and response speed.

[0050] The working principle of this utility model: This solution is implemented in:

[0051] AC 220V input: When AC 220V is input, 220V is converted by the AC-DC module of U1 and then outputs a DC level. The output DC level passes through one of the diodes of V1 and then outputs the VCC level to provide power to the subsequent circuit.

[0052] DC battery input: When DC is input, the DC passes through the filter circuit of L1, C1, and C2, and then passes through another diode of V1 to output the VCC level to provide power to the subsequent circuit.

[0053] AC-DC switching: Under normal circumstances, the DC battery input is always present as a backup power supply, but in general, the DC battery level will be lower than the output level of U1's AC-DC module. Therefore, when there is AC input, the output level of V1 will be higher than the DC battery input level. Therefore, the diode of V1 where the DC level is located will not be turned on, and the subsequent circuit is powered by the AC input.

[0054] When the AC input is disconnected, U1 has no output level, so there is no output on the diode of V1 corresponding to the AC input. At this time, the output VCC level will drop to the DC battery input minus the voltage drop of the diode. Because the DC battery input is always on, the output VCC level will not drop suddenly and significantly, and the clock will remain above the normal working voltage. Seamless switching between AC and DC can be achieved.

[0055] Specific application scenarios

[0056] This terminal is a fixed station that integrates a VHF transceiver unit and a weather display and control unit. It is used for communication between offshore drilling platforms and helicopters and for monitoring platform weather conditions. It needs to work 24 hours a day. Under normal circumstances, the terminal is connected to AC power for operation, but there are occasional power outages on the platform. At this time, the terminal needs to be able to seamlessly switch to a backup battery, that is, DC power supply. This circuit can ensure that the terminal can switch seamlessly when switching from AC power to DC power, and the terminal will never lose power. In addition, the circuit components are relatively simple and low cost.

[0057] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An AC / DC automatic switching circuit for aviation communication meteorological information terminal, characterized in that: include: AC input terminal (X1); DC input terminal (X2); An AC-DC conversion module (U1) having an input terminal connected to an AC input terminal (X1) and an output terminal providing a DC level; A common cathode diode (V1) for selecting a higher level DC output from the AC-DC conversion module (U1) and the DC input terminal (X2); The output terminal (X3) is connected to the output of the common cathode diode (V1) and is used to provide power to the subsequent circuit; A filter circuit, including an inductor (L1) and capacitors (C1, C2), is connected between a DC input terminal (X2) and a common cathode diode (V1); The two input ends of the common cathode diode (V1) are respectively connected to the output of the AC-DC conversion module (U1) and the output of the filter circuit, and the output end is connected to the output end (X3).

2. According to claim 1, an AC / DC automatic switching circuit for aviation communication meteorological information terminal is characterized in that: When the output level of the AC-DC conversion module (U1) is higher than the level of the DC input terminal (X2), the AC-DC conversion module (U1) provides power, and the power is transmitted to the output terminal (X3) through the corresponding diode of the common cathode diode (V1).

3. The AC / DC automatic switching circuit for aviation communication meteorological information terminal according to claim 1, characterized in that: When the AC input terminal (X1) is disconnected and the AC-DC conversion module (U1) stops outputting, power is provided by the DC input terminal (X2) through the filter circuit and another diode of the common cathode diode (V1), ensuring that the output terminal (X3) level will not suddenly drop due to the disconnection of the AC input.

4. The AC / DC automatic switching circuit for aviation communication meteorological information terminal according to claim 1, characterized in that: The filter circuit is used to reduce voltage fluctuation and noise during power switching to ensure stable operation of subsequent circuits.

5. The AC / DC automatic switching circuit for aviation communication meteorological information terminal according to claim 1, characterized in that: The common cathode diode (V1) enables seamless switching between AC and DC inputs.

6. The AC / DC automatic switching circuit for aviation communication meteorological information terminal according to claim 1, characterized in that: The common cathode diode (V1) is preferably a high-speed switching diode.

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