CN205005039U

CN205005039U - Teaching projecting apparatus solar heat protection plug surge current power supply circuit

Info

Publication number: CN205005039U
Application number: CN201520673978.4U
Authority: CN
Inventors: 吴安奇
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-09-01
Filing date: 2015-09-01
Publication date: 2016-01-27
Anticipated expiration: 2025-09-01

Abstract

The utility model discloses a teaching projecting apparatus solar heat protection plug surge current power supply circuit, including chip U1, take damped field effect transistor VS1, take damped field effect transistor VS2, resistance R1 and electric capacity C1, chip U1 pin vin is connecting resistance R3, input vi and take damped field effect transistor VS1's the D utmost point respectively, and the resistance R3 other end is connecting resistance R4 and chip U1 pin UV respectively. The utility model discloses a chip U1 pin OV, UV is the excessive pressure respectively, under -voltage detection foot, this circuit passes through the unsettled messenger's chip of cpo damped field effect transistor VS1 in break -make area and VS2 fast, rely on under -voltage measuring to make GATE pin electricity back on input vi power of chip U1 postpone to open to take damped field effect transistor VS1 and VS2, by R1, the RC network that C1 constitutes makes output vo's voltage rising velocity slow down, resistance R2 has then effectively prevented VS1's switch vibration, thereby hot plug surge current protect function has been realized.

Description

A kind of educational projector anti-hot plug surge current power circuit

Technical field

The utility model relates to a kind of power circuit, specifically a kind of educational projector anti-hot plug surge current power circuit.

Background technology

Power supply in current school is all unified control substantially, every day one open-one close, for the teaching electronic instrument of some precisions, there is the surge current caused because of hot plug possibly in energising moment or shutdown moment, certain damage is caused to teaching electronic instrument.

Utility model content

The purpose of this utility model is to provide a kind of educational projector anti-hot plug surge current power circuit, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the utility model provides following technical scheme:

A kind of educational projector anti-hot plug surge current power circuit, comprise chip U1, with the field effect transistor VS1 of damping, with the field effect transistor VS2 of damping, resistance R1 and electric capacity C1, described chip U1 pin Vin is contact resistance R3 respectively, the D pole of the field effect transistor VS1 of input Vi and band damping, the resistance R3 other end is contact resistance R4 and chip U1 pin UV respectively, the resistance R4 other end is contact resistance R5 and chip U1 pin OV respectively, the resistance R5 other end connects chip U1 pin GND and ground connection, the G pole contact resistance R2 of the field effect transistor VS1 of described band damping, the resistance R2 other end is contact resistance R1 respectively, the G pole of the field effect transistor VS2 with damping and chip U1 pin Gate, the resistance R1 other end connects ground capacity C1, chip U1 pin Source connects the S pole of the S pole of the field effect transistor VS1 of connecting band damping and the field effect transistor VS2 of band damping respectively, the D pole of the field effect transistor VS2 with damping connects output end vo and chip U1 pin Out respectively, chip U1 pin Vcc connects chip U1 pin Rev by electric capacity C2, described chip U1 model is LTC4352.

As the utility model further scheme: the field effect transistor VS1 of described band damping and the field effect transistor VS2 of band damping all adopts SI7336.

Compared with prior art, the beneficial effects of the utility model are: chip U1 pin OV of the present utility model, UV is respectively overvoltage, under-voltage detection pin, this circuit can not the field effect transistor VS1 of quick on-off band damping and VS2 by the unsettled chip that makes of Cpo, under-voltage detection is relied on to make the GATE pin of chip U1 after input Vi power supply electrifying, postpone to open field effect transistor VS1 and the VS2 of band damping, by R1, the resistance-capacitance network of C1 composition makes the rate of voltage rise of output end vo slow down, resistance R2 then effectively prevent the switch oscillating of VS1, thus achieve hot plug surge current protection function.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of educational projector anti-hot plug surge current power circuit.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 1, in the utility model embodiment, a kind of educational projector anti-hot plug surge current power circuit, comprise chip U1, with the field effect transistor VS1 of damping, with the field effect transistor VS2 of damping, resistance R1 and electric capacity C1, described chip U1 pin Vin is contact resistance R3 respectively, the D pole of the field effect transistor VS1 of input Vi and band damping, the resistance R3 other end is contact resistance R4 and chip U1 pin UV respectively, the resistance R4 other end is contact resistance R5 and chip U1 pin OV respectively, the resistance R5 other end connects chip U1 pin GND and ground connection, the G pole contact resistance R2 of the field effect transistor VS1 of described band damping, the resistance R2 other end is contact resistance R1 respectively, the G pole of the field effect transistor VS2 with damping and chip U1 pin Gate, the resistance R1 other end connects ground capacity C1, chip U1 pin Source connects the S pole of the S pole of the field effect transistor VS1 of connecting band damping and the field effect transistor VS2 of band damping respectively, the D pole of the field effect transistor VS2 with damping connects output end vo and chip U1 pin Out respectively, chip U1 pin Vcc connects chip U1 pin Rev by electric capacity C2, described chip U1 model is LTC4352.

Operation principle of the present utility model is: refer to Fig. 1; chip U1 pin OV, UV are respectively overvoltage, under-voltage detection pin; this circuit can not the field effect transistor VS1 of quick on-off band damping and VS2 by the unsettled chip that makes of Cpo; under-voltage detection is relied on to make the GATE pin of chip U1 after input Vi power supply electrifying, postpone to open field effect transistor VS1 and the VS2 of band damping; the resistance-capacitance network be made up of R1, C1 makes the rate of voltage rise of output end vo slow down; resistance R2 then effectively prevent the switch oscillating of VS1, thus achieves hot plug surge current protection function.

To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.

In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.

Claims

1. an educational projector anti-hot plug surge current power circuit, comprise chip U1, with the field effect transistor VS1 of damping, with the field effect transistor VS2 of damping, resistance R1 and electric capacity C1, it is characterized in that, described chip U1 pin Vin is contact resistance R3 respectively, the D pole of the field effect transistor VS1 of input Vi and band damping, the resistance R3 other end is contact resistance R4 and chip U1 pin UV respectively, the resistance R4 other end is contact resistance R5 and chip U1 pin OV respectively, the resistance R5 other end connects chip U1 pin GND and ground connection, the G pole contact resistance R2 of the field effect transistor VS1 of described band damping, the resistance R2 other end is contact resistance R1 respectively, the G pole of the field effect transistor VS2 with damping and chip U1 pin Gate, the resistance R1 other end connects ground capacity C1, chip U1 pin Source connects the S pole of the S pole of the field effect transistor VS1 of connecting band damping and the field effect transistor VS2 of band damping respectively, the D pole of the field effect transistor VS2 with damping connects output end vo and chip U1 pin Out respectively, chip U1 pin Vcc connects chip U1 pin Rev by electric capacity C2, described chip U1 model is LTC4352.

2. educational projector according to claim 1 anti-hot plug surge current power circuit, is characterized in that, the field effect transistor VS1 of described band damping and the field effect transistor VS2 of band damping all adopts SI7336.