Multimedia teaching equipment for improving English classroom interaction

Abstract

The utility model relates to multimedia teaching equipment for improving English classroom interaction, and belongs to the field of multimedia teaching. The device mainly comprises a video signal detection module, a power supply control module and a priority switching module, and is designed to be capable of monitoring video signal input states of external and internal VGA interfaces in real time and automatically identifying and switching to corresponding signals. When the equipment detects external signal input, the dual-channel relay can be triggered, so that the power output of the relay group is activated, and an external signal channel is switched. And when the external signal is interrupted, the equipment can be automatically reset to the internal signal channel, and the power supply state of the external equipment is kept. No personnel intervention is needed in the whole process, and automation and intellectualization of teaching equipment are achieved. According to the design, the problems that existing multimedia teaching equipment is complex in operation, prone to making mistakes, incapable of automatically recognizing and switching signals, incapable of intelligently controlling a power switch and the like are solved, the teaching efficiency is greatly improved, the teaching environment is optimized, and the multimedia teaching equipment is an ideal choice for modern classrooms.

Description

Technical Field

[0001] This utility model belongs to the field of multimedia teaching, and more specifically to a multimedia teaching device for improving interaction in English classrooms. Background Technology

[0002] Multimedia teaching has gradually become a mainstream approach in modern education, especially in English classrooms, where many teachers use multimedia materials such as pictures, videos, and audio to enhance classroom interaction and increase the enjoyment of learning. However, traditional multimedia teaching equipment usually requires manual operation, which is complex, error-prone, and unable to flexibly handle unexpected situations such as video signal interruptions. These problems all negatively impact the effectiveness of classroom teaching.

[0003] Furthermore, in traditional classroom environments, the power operation of equipment such as projectors, screens, and speakers usually requires manual control. This is not only cumbersome but also easily leads to wasted electricity when the equipment is not in use. At the same time, manual power operation can also cause safety issues, such as accidental activation of the power switch causing equipment damage.

[0004] Previously, centralized control technology for multimedia teaching equipment often used a central controller to control devices such as projectors, screens, and speakers. With the development of network technology, network software control methods have also emerged. However, these methods still suffer from problems such as complex control, difficult operation, high failure rate, poor reliability, and high maintenance costs.

[0005] Therefore, the emergence of a multimedia teaching device that can automatically identify and switch signals and intelligently control the power switch is undoubtedly a significant improvement over existing teaching equipment. This device can enhance teaching efficiency while reducing problems and distractions during the teaching process, bringing new possibilities and possibilities to modern education. Utility Model Content

[0006] The main objective of this invention is to solve the problems of existing multimedia teaching equipment, such as complex operation, susceptibility to errors, inability to automatically identify and switch signals, inability to intelligently control power switches, and high equipment maintenance costs, so as to improve classroom teaching efficiency and the ease of use, safety, and durability of the equipment.

[0007] To achieve the above objectives, this utility model employs the following technical solution: the device includes:

[0008] The video signal detection module is used to monitor the video signal input status of the external VGA interface and the internal VGA interface in real time.

[0009] The power control module includes a logic OR gate chip and a relay group connected to the chip. The relay group is connected to the power supply of the projector, screen and speakers through four output interfaces.

[0010] The priority switching module consists of a NOT gate chip and a dual-channel relay. The input terminal of the NOT gate chip is connected to the synchronization signal detection circuit of the external VGA interface, and the output terminal is connected to the control coil of the dual-channel relay.

[0011] The device acquires the field synchronization signal of the external VGA interface through the transistor in the synchronization signal detection circuit. When an external signal input is detected, the logic NOT gate chip is triggered to output a low level to drive the dual-channel relay to switch to the external signal channel. At the same time, the power output of the relay group is activated through the logic OR gate chip. After the external signal is interrupted, the synchronization signal detection circuit is cut off, and the dual-channel relay automatically resets to the internal signal channel.

[0012] In one embodiment, the dual-channel relay is a JQX-40F-2Z high-power relay, and a DS2Y-S-DC5V signal relay is connected in series in the power supply circuit of its control coil. The coil of the signal relay is connected to the output pin of a NOT gate chip. The NOT gate chip is a 74LS04 chip, and its input terminal is connected to the collector of a transistor through a current-limiting resistor. The base of the transistor is connected to the field synchronization signal line of an external VGA interface.

[0013] In one embodiment, the synchronization signal detection circuit includes a 9014 NPN transistor, whose base is connected to the field synchronization signal line of the external VGA interface through a voltage divider resistor, its emitter is grounded, and its collector is connected to a +5V power supply through a pull-up resistor and outputs to the input terminal of a logic NOT gate chip; the field synchronization signal line is isolated from the field synchronization signal line of the internal VGA interface through a diode, and the anode of the diode is connected to the external interface.

[0014] In one embodiment, the logic OR gate chip in the power control module is a 74LS32 chip. Its two input terminals are respectively connected to the vertical sync signal detection node of the external VGA interface and the horizontal sync signal detection node of the internal VGA interface. The output terminal is connected to the control terminal of the relay group through a driving transistor. The relay group includes four JQX-40F-2Z relays. The normally open contact of each relay is connected in series in the 220V power supply circuit of the projector, screen, speakers and backup equipment.

[0015] In one embodiment, a self-resetting fuse with a rated current of 500mA is provided between the +5V power supply pin of the external VGA interface and the power supply pin of the NOT gate chip; each of the four output interfaces has an independent fuse connected in series on its power supply line, with a rated current of 2A; and the main power input interface of the device has a main fuse with a rated current of 10A.

[0016] In one embodiment, the video signal channel of the internal VGA interface is provided with a signal buffer circuit composed of a 74LS04 logic NOT gate chip, and its output is connected to the internal signal contact of the dual-channel relay through a resistor. A 75Ω impedance matching resistor is provided between the contact and the video input interface of the projector.

[0017] The beneficial effects of this utility model are:

[0018] This new multimedia teaching equipment solves the problems of existing equipment, such as complex operation, susceptibility to errors, inability to automatically identify and switch signals, lack of intelligent power switch control, and high maintenance costs. It can automatically identify and intelligently switch various video signals, and automatically turn on the power to external devices after a video signal is input, saving operation time and improving teaching efficiency. Simultaneously, its unique power control and priority switching module 3 design, along with safety features to protect the equipment, improves safety, reduces failure rates and maintenance costs, and extends the equipment's lifespan. Overall, this multimedia teaching equipment can significantly improve the teaching environment and increase teaching efficiency, making it an ideal choice for modern classrooms. Attached Figure Description

[0019] Figure 1 This is a block diagram of the device of this utility model;

[0020] Figure 2 This is the circuit diagram of the power control module of this utility model;

[0021] Figure 3 This is the circuit diagram of the priority switching module of this utility model.

[0022] In the diagram, 1-video signal detection module, 2-power control module, 3-priority switching module. Detailed Implementation

[0023] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0024] like Figure 1 As shown, a multimedia teaching device for improving interaction in English classrooms includes:

[0025] Video signal detection module 1 is used to monitor the video signal input status of the external VGA interface and the internal VGA interface in real time;

[0026] The power control module 2 includes a logic OR gate chip and a relay group connected to the chip. The relay group is connected to the power supply of the projector, screen and speakers through four output interfaces.

[0027] Power control circuit (such as) Figure 2 The system uses a 74LS32 logic chip and a relay to form a shared control circuit, which then determines whether there is a video signal input to the two VGA interfaces J1 and J2. If there is a video signal input to either interface, the relevant external power supply is activated.

[0028] In the power control circuit, pin 13 (vertical sync signal) of the two VGA signal interfaces J1 and J2 is connected to an OR gate logic chip 74LS32 for judgment. If there is a signal input at interface J1 or J2, the signal switches through a transistor 9014, controlling relay DS2Y-S-DC5V to power two high-power relays JQX-40F-2Z. Relay K1 controls interfaces P2 and P3, and relay K2 controls interfaces P4 and P5, thus enabling the conduction of power output interfaces P2, P3, P4, and P5 and power input interface P1. Since this circuit involves high voltage and has a relatively large output power, two high-power relays JQX-40F-2Z are selected for control. A fuse is connected to the power input interface P1.

[0029] Priority switching module 3 consists of a NOT gate chip and a dual-channel relay. The input terminal of the NOT gate chip is connected to the synchronization signal detection circuit of the external VGA interface, and the output terminal is connected to the control coil of the dual-channel relay.

[0030] The synchronization signal detection circuit includes a 9014 NPN transistor, whose base is connected to the field synchronization signal line of the external VGA interface through a voltage divider resistor, its emitter is grounded, and its collector is connected to a +5V power supply through a pull-up resistor and outputs to the input terminal of a logic NOT gate chip; the field synchronization signal line is isolated from the field synchronization signal line of the internal VGA interface through a diode, and the anode of the diode is connected to the external interface.

[0031] The dual-channel relay is a JQX-40F-2Z high-power relay. A DS2Y-S-DC5V signal relay is connected in series in the power supply circuit of its control coil. The coil of the signal relay is connected to the output pin of the NOT gate chip. The NOT gate chip is a 74LS04 chip. Its input terminal is connected to the collector of the transistor through a current-limiting resistor. The base of the transistor is connected to the field synchronization signal line of the external VGA interface.

[0032] The device acquires the field synchronization signal of the external VGA interface through the transistor in the synchronization signal detection circuit. When an external signal input is detected, the logic NOT gate chip is triggered to output a low level to drive the dual-channel relay to switch to the external signal channel. At the same time, the power output of the relay group is activated through the logic OR gate chip. After the external signal is interrupted, the synchronization signal detection circuit is cut off, and the dual-channel relay automatically resets to the internal signal channel.

[0033] Video signal selection circuit (e.g.) Figure 3 It has two video signal input terminals J1 and J2, a video signal output terminal J3, and an external connection port P1. The DS2Y-S-DC5V (DC 5V double-pair relay) is controlled by a 74LS04 logic chip to form a priority selection circuit for selecting computer video signals.

[0034] Two VGA input ports are provided, J1 for external VGA video signals and J2 for internal VGA video signals. Pin 13 (vertical sync signal) of both ports is connected to a 74LS04 NOT gate logic chip for logic judgment. If there is no video signal input at J1, three 9014 transistors control three DS2Y-S-DC5V relays to output the red, green, and blue primary colors, vertical sync, and horizontal sync signals of the internal video signal to the external VGA input port J3 and external connection port P1. A self-resetting fuse with a rated current of 500mA is installed between the +5V power supply pin of the external VGA interface and the power supply pin of the NOT gate chip. Each of the four output interfaces has an independent fuse connected in series on its power line, with a rated current of 2A. The main power input interface of the device has a master fuse with a rated current of 10A.

[0035] If there is a video signal input at interface J1, three DS2Y-S-DC5V relays are controlled by three 9014 transistor switches to output the red, green, and blue primary colors, vertical sync, and horizontal sync signals of the internal video signal to the VGA external interface J3 and external connection port P1. When the external video signal is disconnected, the 9014 switches close, and the video signal automatically switches back to the internal video signal. The J1 video interface has a higher priority than the J2 video interface, enabling automatic recognition of external video signals and intelligent video switching.

[0036] The working principle of this utility model is as follows: The multimedia teaching equipment of this utility model monitors the status of the input video signal in real time through the video signal detection module 1. When an external signal input is detected, the priority switching module 3 triggers a dual-channel relay to switch to the external signal channel, and the power control module 2 activates the power output of the relay group, causing the projector, screen, speakers, and other equipment to turn on automatically. When the external audio and video signal is interrupted, the equipment automatically switches back to the internal signal channel and maintains the power status of the external devices, quickly realizing intelligent switching and continuous teaching without additional manual intervention.

[0037] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A multimedia teaching device for improving interaction in English classrooms, characterized in that: The device includes: The video signal detection module is used to monitor the video signal input status of the external VGA interface and the internal VGA interface in real time. The power control module includes a logic OR gate chip and a relay group connected to the chip. The relay group is connected to the power supply of the projector, screen and speakers through four output interfaces. The priority switching module consists of a NOT gate chip and a dual-channel relay. The input of the NOT gate chip is connected to the synchronization signal detection circuit of the external VGA interface, and the output is connected to the control coil of the dual-channel relay. The device acquires the field synchronization signal of the external VGA interface through the transistor in the synchronization signal detection circuit. When an external signal input is detected, the logic NOT gate chip is triggered to output a low level to drive the dual-channel relay to switch to the external signal channel. At the same time, the power output of the relay group is activated through the logic OR gate chip. After the external signal is interrupted, the synchronization signal detection circuit is cut off, and the dual-channel relay automatically resets to the internal signal channel.

2. The multimedia teaching device for improving English classroom interaction according to claim 1, characterized in that: The dual-channel relay is a JQX-40F-2Z high-power relay. A DS2Y-S-DC5V signal relay is connected in series in the power supply circuit of its control coil. The coil of the signal relay is connected to the output pin of the NOT gate chip. The NOT gate chip is a 74LS04 chip. Its input terminal is connected to the collector of the transistor through a current-limiting resistor. The base of the transistor is connected to the field synchronization signal line of the external VGA interface.

3. The multimedia teaching device for improving English classroom interaction according to claim 1, characterized in that: The synchronization signal detection circuit includes a 9014 NPN transistor, whose base is connected to the field synchronization signal line of the external VGA interface through a voltage divider resistor, its emitter is grounded, and its collector is connected to a +5V power supply through a pull-up resistor and outputs to the input terminal of a logic NOT gate chip; the field synchronization signal line is isolated from the field synchronization signal line of the internal VGA interface through a diode, and the anode of the diode is connected to the external interface.

4. The multimedia teaching device for improving English classroom interaction according to claim 1, characterized in that: The logic OR gate chip in the power control module is a 74LS32 chip. Its two input terminals are connected to the vertical sync signal detection node of the external VGA interface and the horizontal sync signal detection node of the internal VGA interface, respectively. The output terminal is connected to the control terminal of the relay group through a driver transistor. The relay group contains four JQX-40F-2Z relays. The normally open contact of each relay is connected in series in the 220V power supply circuit of the projector, screen, speakers and backup equipment.

5. A multimedia teaching device for improving English classroom interaction according to claim 1, characterized in that: A self-resetting fuse with a rated current of 500mA is provided between the +5V power supply pin of the external VGA interface and the power supply pin of the NOT gate chip; each of the four output interfaces has an independent fuse connected in series on its power supply line, with a rated current of 2A; the main power input interface of the device has a main fuse with a rated current of 10A.

6. A multimedia teaching device for improving English classroom interaction according to claim 1, characterized in that: The video signal channel of the internal VGA interface is equipped with a signal buffer circuit composed of a 74LS04 logic NOT gate chip. Its output is connected to the internal signal contact of the dual-channel relay through a resistor. A 75Ω impedance matching resistor is provided between the contact and the video input interface of the projector.

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