CN200944229Y

CN200944229Y - Projector switching device

Info

Publication number: CN200944229Y
Application number: CN 200620032377
Authority: CN
Inventors: 李培利
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-09-01
Filing date: 2006-09-01
Publication date: 2007-09-05
Anticipated expiration: 2016-09-01

Abstract

The utility model discloses a projector switcher, which comprises a video card output analog signal interface switching circuit which has an output port connected with a projector and a plurality of input ports which are connected with the video card output analog signal interfaces of external computers or portable computers; the output port of a control circuit consisting of a singlechip is electrically connected with an input port of the video card output analog signal interface switching circuit for controlling the switch of the video card output analog signal interface of the external computers or portable computers; a switch operating circuit consisting of keys and LEDs is electrically connected with an input port of the control circuit consisting of a singlechip, so that analog signals are outputted by switching the output to the video card of the projector using the keys; after being filtered by a capacitor, a Universal Serial Bus interface circuit is electrically connected with power input ports of the switch operating circuit consisting of keys and LEDs, the control circuit consisting of a singlechip and the video card output analog signal interface switching circuit. The utility model has advantages of low cost, compact structure and small volume.

Description

The projector switch

Technical field

The utility model relates to projector, especially relates to the projector switch.

Background technology

Projector has been indispensable office equipment in modern meeting, discussion, speech, demonstration.The spokesman projects display message on the projection screen by the VGA (video card output analog signal interface) of computing machine, reads or see mould for the participant.But projector has only a VGA signal source input end, as when needing the projector signal to switch to the VGA signal of another computing machine, just needs the VGA signal wire of plug projector again, and in many people discussed, this pattern was inconvenient especially.

Similar VGA signal shifter or network type projector signal shifter are arranged in the market.The former is not custom-designed at projector, mainly is used in industry spot and safety-security area, and its structure is too fat to move, and power supply is complicated, complex operation, and switch and electrical cables separate are not suitable for meeting occasion and the regular placement storage of using and pack.The latter sends into the equipment that links to each other with projector to projection information by wired or wireless network, and by the information of choice of equipment projection, advantage is the restriction that does not have physical location, need not plug cable etc., but it costs an arm and a leg exactly.

The utility model content

The utility model purpose is to provide the projector switch of a kind of with low cost, compact conformation, blocked operation one-key operation.

For achieving the above object, the utility model can be taked following technical proposals:

Projector switch described in the utility model, comprise video card output analog signal interface commutation circuit, it has the output port that is connected with projector and the video card of a plurality of and external computing machine or notebook computer is exported the input port that analog signal interface is connected; The control circuit output terminal of being made up of single-chip microcomputer is electrically connected with described video card output analog signal interface commutation circuit input end, is used to control the switching of external computing machine or notebook computer video card output analog signal interface; The blocked operation circuit that button and light emitting diode are formed is electrically connected with the described control circuit input end of being made up of single-chip microcomputer, switches the video card output simulating signal that outputs to projector by button; The blocked operation circuit that the USB (universal serial bus) circuit is formed with button and light emitting diode respectively behind capacitor filtering, the control circuit of being made up of single-chip microcomputer, the power input that video card is exported the analog signal interface commutation circuit are electrically connected.

That advantage of the present utility model is is with low cost, compact conformation, volume are little.Utilize 5V, the 500mA power supply power supply of the USB (USB (universal serial bus)) of desk-top computer/notebook computer, reduced annex, the line when simplifying utilization loaded down with trivial details.Operation is simple and reliable, and a button once switches several roads VGA input signal to projector, and LED indication directly perceived is when the position of front projector input information source; Simple in structure, adopt VGA cable, USB power cable are welded direct to circuit board, it is an integral body that all cables are fastened on the casing, is more convenient for safeguarding, carrying and take care of.

Description of drawings

Fig. 1 is a schematic block circuit diagram of the present utility model.

Fig. 2 is a VGA commutation circuit schematic diagram described in the utility model.

Fig. 3 is the control circuit schematic diagram based on MCU described in the utility model.

Fig. 4 is button described in the utility model, LED blocked operation circuit theory diagrams.

Fig. 5 is USB circuit theory diagrams described in the utility model.

Embodiment

As shown in the figure, projector switch described in the utility model, it comprises video card output analog signal interface (VGA) commutation circuit, and it has the output port and four input ports that are connected with the video card output analog signal interface of external computing machine or notebook computer that is connected with projector; The control circuit output terminal of being made up of single-chip microcomputer is electrically connected with described video card output analog signal interface commutation circuit input end, the signal of the VGA of computing machine or notebook output by red primary, green primary, blue primary, row synchronously, field sync signal forms, red primary, green primary, blue primary, row are synchronously under the control of single-chip microcomputer (MCU), field sync signal switches to output signal by the input of a certain road, are used to control the switching of external computing machine or notebook computer video card output analog signal interface; The blocked operation circuit that button and light emitting diode LED form is electrically connected with the described control circuit input end of being made up of single-chip microcomputer (MCU), by button switch output to projector, by the simulating signal of external computing machine or the output of notebook computer video card, the user gives the control circuit trigger pip of being made up of single-chip microcomputer (MCU) by button, and the LED light emitting diode is indicated the signal source of current defeated projector projection; The blocked operation circuit that USB (universal serial bus) (USB) circuit is formed with button and light emitting diode LED respectively after capacitor C 1, C2 filtering, the control circuit of being made up of single-chip microcomputer (MCU), the power input that video card is exported analog signal interface (VGA) commutation circuit are electrically connected.

Claims

1, a kind of projector switch, it is characterized in that: it comprises video card output analog signal interface commutation circuit, and it has the output port that is connected with projector and the video card of a plurality of and external computing machine or notebook computer is exported the input port that analog signal interface is connected; The control circuit output terminal of being made up of single-chip microcomputer is electrically connected with described video card output analog signal interface commutation circuit input end, is used to control the switching of external computing machine or notebook computer video card output analog signal interface; The blocked operation circuit that button and light emitting diode are formed is electrically connected with the described control circuit input end of being made up of single-chip microcomputer, switches the video card output simulating signal that outputs to projector by button; The blocked operation circuit that the USB (universal serial bus) circuit is formed with button and light emitting diode respectively behind capacitor filtering, the control circuit of being made up of single-chip microcomputer, the power input that video card is exported the analog signal interface commutation circuit are electrically connected.