CN206225986U - A kind of voltage protection system on camera - Google Patents
A kind of voltage protection system on camera Download PDFInfo
- Publication number
- CN206225986U CN206225986U CN201621302286.XU CN201621302286U CN206225986U CN 206225986 U CN206225986 U CN 206225986U CN 201621302286 U CN201621302286 U CN 201621302286U CN 206225986 U CN206225986 U CN 206225986U
- Authority
- CN
- China
- Prior art keywords
- voltage
- camera
- supply voltage
- comparison module
- semiconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a kind of voltage protection system on camera, including supply voltage detection module, supply voltage comparison module, reference voltage module, power switch.Dc source is by power switch for camera is powered；Supply voltage detection module is sampled to the voltage of dc source, for supply voltage comparison module provides sampled voltage；Reference voltage module provides reference voltage for supply voltage comparison module；With reference voltage be compared sampled voltage by supply voltage comparison module；In the state of sampled voltage is more than reference voltage, supply voltage comparison module control power switch cut-off, so as to dc source and camera be disconnected.The voltage protection system is detected to supply voltage, and controls power switch, protects camera not burnt because supply voltage is too high.
Description
Technical field
The utility model is related to camera technique field, more particularly to a kind of voltage protection system on camera.
Background technology
Existing camera is powered no-voltage defencive function, and phase is supplied directly to using USB standard by external power supply adapter
Machine.If the voltage of external adapter output is higher than 5.5V, during beyond USB standard, the damage of camera critical component can be caused.
Therefore, the damage for how preventing the camera critical component caused by the overtension that external adapter is exported is to need what is solved to ask
Topic.
Utility model content
In view of the shortcomings of the prior art, the utility model proposes a kind of voltage protection system on camera, the electricity
Pressure protection system is detected to supply voltage, and controls power switch, solves what camera easily burnt because supply voltage is too high
Problem.
To achieve these goals, technical solutions of the utility model are as follows：
A kind of voltage protection system on camera, including supply voltage detection module, supply voltage comparison module, base
Quasi- voltage module, power switch.Dc source is by power switch for camera is powered；Supply voltage detection module is to dc source
Voltage sampled, for supply voltage comparison module provides sampled voltage；Reference voltage module is supply voltage comparison module
Reference voltage is provided；With reference voltage be compared sampled voltage by supply voltage comparison module；It is more than benchmark in sampled voltage
In the state of voltage, supply voltage comparison module control power switch cut-off, so as to dc source and camera be disconnected.
A kind of voltage protection system on camera, including resistance R1, R2, R3, operational amplifier U1A, p-type metal-oxide-semiconductor
Q1, microcontroller.The source electrode of p-type metal-oxide-semiconductor Q1 sequentially passes through resistance R1, R2 ground connection.The common node of resistance R1 and resistance R2 with
The normal phase input end of operational amplifier U1A is connected.Microcontroller is connected with the inverting input of operational amplifier U1A.Fortune
The output end for calculating amplifier U1A is connected with the grid of p-type metal-oxide-semiconductor Q1.The source electrode of p-type metal-oxide-semiconductor Q1 is by resistance R3 and grid
It is connected；The drain electrode camera of p-type metal-oxide-semiconductor Q1 is connected.
The beneficial effects of the utility model：
The voltage protection system is detected to supply voltage, and controls power switch, protects camera not because of supply voltage
It is too high and burn.
Brief description of the drawings
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Wherein, the reference of Fig. 1 to Fig. 2 is：Supply voltage detection module 1, supply voltage comparison module 2, benchmark electricity
Die block 3, power switch 4.
Specific embodiment
With reference to the accompanying drawings and examples, the utility model is expanded on further.
As shown in figure 1, a kind of voltage protection system on camera, including supply voltage detection module 1, supply voltage
Comparison module 2, reference voltage module 3, power switch 4.
Dc source is by power switch 4 for camera is powered；Supply voltage detection module 1 is carried out to the voltage of dc source
Sampling, is that supply voltage comparison module 2 provides sampled voltage；Reference voltage module 3 is that supply voltage comparison module 2 provides benchmark
Voltage；With reference voltage be compared sampled voltage by supply voltage comparison module 2；In shape of the sampled voltage more than reference voltage
Under state, the control power switch 4 of supply voltage comparison module 2 ends, so as to dc source and camera be disconnected.
As shown in Fig. 2 being the circuit theory diagrams of the voltage protection system being used on camera.Supply voltage detection module 1
Comprising resistance R1, R2.Supply voltage comparison module 2 includes operational amplifier U1A.Power switch 4 includes p-type metal-oxide-semiconductor Q1, resistance
R3.Reference voltage module 3 provides reference voltage by microcontroller.
The input VIN of power switch 4 sequentially passes through resistance R1, R2 ground connection.The common node B of resistance R1 and resistance R2 with
The normal phase input end of operational amplifier U1A is connected.Reference voltage module 3 is connected with the inverting input of operational amplifier U1A
Connect.The source electrode (S poles) of p-type metal-oxide-semiconductor Q1 is the input VIN of power switch 4；The drain electrode (D poles) of p-type metal-oxide-semiconductor Q1 is opened for power supply
Close 4 output end VOUT.Output end VOUT is connected with camera.The output end of operational amplifier U1A and the grid of p-type metal-oxide-semiconductor Q1
Pole (G poles) is connected.The source electrode (S poles) of p-type metal-oxide-semiconductor Q1 is connected by resistance R3 with grid (G poles).
Operation principle：
The G of p-type metal-oxide-semiconductor Q1 extremely high level when, p-type metal-oxide-semiconductor Q1 is by closing；G extremely low level when, p-type metal-oxide-semiconductor Q1
Conducting, camera works on power.MCU, operational amplifier U1A, the power supply of resistance R1, R2 composition camera and supply voltage detection
Network.Operational amplifier U1A is LM258 discharge circuits, and device use is compared here.When the normal phase input end of operational amplifier U1A
Level higher than inverting input level when, the output end output high level of operational amplifier U1A, p-type metal-oxide-semiconductor Q1 do not lead
Logical, camera does not work.When the level of the normal phase input end of operational amplifier U1A is less than the level of inverting input, computing is put
The output end of big device U1A is output as low level, and p-type metal-oxide-semiconductor Q1 conductings, camera obtains electric work.
The voltage of node B is obtained by supply voltage VIN by resistance R1, R2 partial pressure, i.e. the voltage VB=VIN of node B
(R2/R1+R2)。
It is the reference voltage 3.3V of stabilization in the state of MCU output high level.If VIN ＜ 5.6V, i.e. VB ＜ 3.3V, section
Point C is low level, and p-type metal-oxide-semiconductor Q1 conductings, camera is powered.If VIN ＞ 5.6V, i.e. VB ＞ 3.3V, node C is high level, P
Type metal-oxide-semiconductor Q1 is cut off；Camera is powered stopping, so as to reach voltage-limiting protection.
In the state of MCU output low levels, no matter VIN is much, and node C is always high level, and p-type metal-oxide-semiconductor Q1 is cut
Only, camera does not work.
Above-described is only preferred embodiment of the present utility model, and the utility model is not limited to above example.Can
With understand, those skilled in the art directly derived on the premise of basic conception of the present utility model is not departed from or associated its
It is improved and change is considered as being included within protection domain of the present utility model.
Claims (2)
1. a kind of voltage protection system on camera, it is characterised in that：
Including supply voltage detection module, supply voltage comparison module, reference voltage module, power switch；
Dc source is by the power switch for camera is powered；
The supply voltage detection module is sampled to the voltage of dc source, is adopted for the supply voltage comparison module is provided
Sample voltage；
The reference voltage module provides reference voltage for the supply voltage comparison module；
With the reference voltage be compared the sampled voltage by the supply voltage comparison module；
In the state of the sampled voltage is more than the reference voltage, the supply voltage comparison module control power supply is opened
Cut-off is closed, so as to dc source and camera be disconnected.
2. a kind of voltage protection system on camera, it is characterised in that：
Including resistance R1, R2, R3, operational amplifier U1A, p-type metal-oxide-semiconductor Q1, microcontroller；
The source electrode of p-type metal-oxide-semiconductor Q1 sequentially passes through resistance R1, R2 ground connection；
Resistance R1 is connected with the common node of resistance R2 with the normal phase input end of operational amplifier U1A；
Microcontroller is connected with the inverting input of operational amplifier U1A；
The output end of operational amplifier U1A is connected with the grid of p-type metal-oxide-semiconductor Q1；
The source electrode of p-type metal-oxide-semiconductor Q1 is connected by resistance R3 with grid；The drain electrode camera of p-type metal-oxide-semiconductor Q1 is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621302286.XU CN206225986U (en) | 2016-11-30 | 2016-11-30 | A kind of voltage protection system on camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621302286.XU CN206225986U (en) | 2016-11-30 | 2016-11-30 | A kind of voltage protection system on camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206225986U true CN206225986U (en) | 2017-06-06 |
Family
ID=58787224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621302286.XU Expired - Fee Related CN206225986U (en) | 2016-11-30 | 2016-11-30 | A kind of voltage protection system on camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206225986U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110032263A (en) * | 2019-04-15 | 2019-07-19 | 苏州浪潮智能科技有限公司 | A kind of server and its power-down protection circuit |
-
2016
- 2016-11-30 CN CN201621302286.XU patent/CN206225986U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110032263A (en) * | 2019-04-15 | 2019-07-19 | 苏州浪潮智能科技有限公司 | A kind of server and its power-down protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203166467U (en) | Overvoltage protection circuit | |
| CN103869722B (en) | A kind of controlling hard switch machine system | |
| CN204361658U (en) | A kind of under-voltage protecting circuit | |
| CN203691724U (en) | Hot plug protection circuit used for LED illuminator | |
| CN203339652U (en) | Interface protection circuit | |
| CN206727643U (en) | A kind of under-voltage and overvoltage crowbar | |
| CN108808643A (en) | A kind of analog switching circuit | |
| CN205453082U (en) | Anti latch circuit based on current detection | |
| CN205509491U (en) | DC power supply prevents reverse -connection protective circuit | |
| CN204928783U (en) | Switch control circuit | |
| CN103414163A (en) | Direct-current power supply output overcurrent protection device | |
| CN206225986U (en) | A kind of voltage protection system on camera | |
| CN208158100U (en) | A kind of output overvoltage protection circuit and the power supply comprising the circuit | |
| CN204634138U (en) | Be applied to the LED control circuit of hot plug | |
| CN209046611U (en) | A kind of power switch button circuit | |
| CN204089330U (en) | A kind of adaptive power-supply battery supplies power with double circuit device | |
| CN206099334U (en) | Prevent reverse -connection protective circuit with cross brown -out detection | |
| CN201266984Y (en) | Detection circuit for LCD-TV power supply | |
| CN209250219U (en) | A kind of under-voltage delay protection device of power supply | |
| CN204334042U (en) | Device for managing and controlling electrical source | |
| CN203690882U (en) | Computer USB interface short circuit prevention circuit | |
| CN204597149U (en) | A kind of appliances power source socket | |
| CN204928080U (en) | Overvoltage protection circuit | |
| CN204068681U (en) | A kind of switch power module current-limiting protection circuit | |
| CN203504139U (en) | Overvoltage protection device of water-turbine generator set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170606 Termination date: 20181130 |