CN109996064A - The power protection system of camera cable - Google Patents
The power protection system of camera cable Download PDFInfo
- Publication number
- CN109996064A CN109996064A CN201910280052.1A CN201910280052A CN109996064A CN 109996064 A CN109996064 A CN 109996064A CN 201910280052 A CN201910280052 A CN 201910280052A CN 109996064 A CN109996064 A CN 109996064A
- Authority
- CN
- China
- Prior art keywords
- voltage
- output end
- comparison circuit
- low
- electrically connected
- 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.)
- Pending
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/65—Control of camera operation in relation to power supply
Abstract
The power protection system of camera cable provided by the invention includes: power switch chip, is electrically connected with the cable of video camera；Source bleeder circuit is electrically connected simultaneously output source voltage with the power switch chip；Low-voltage comparison circuit provides low reference voltage and is compared with the source voltage；High voltage comparison circuit provides high reference voltage and is compared with the source voltage；And electric-controlled switch, it is electrically connected with the output end of the low-voltage comparison circuit and the output end of the high voltage comparison circuit, and be electrically connected with the enable end；When the source voltage is higher than the high reference voltage lower than the low reference voltage or the source voltage, the low-voltage comparison circuit or the high voltage comparison circuit start the electric-controlled switch and are controlled and be grounded the enable end, thereby turn off the power switch chip.
Description
Technical field
The present invention relates to video camera (camera monitor), especially a kind of power protection system of camera cable.
Background technique
Existing video camera, also known as camera monitor need slowly left and right reciprocating rotation machine in certain applications
Itself carry out follow shot range, thus reaches bigger shooting area coverage.When rotating video camera, cable connected to it
It can be straightened or be bent with the rotation of video camera and and then, such situation in a short time will not impact cable, so
And under use year in year out, the crust of cable passes through prolonged weathering and solarization, it is possible to rotten or embrittlement, into
And may it is lasting be straightened or curved movement under or friction with other cables under cause breakage.Cable breakdown is possible to
It directly contacts because electric wire is exposed and causes short circuit, it is also possible to cause short circuit because of the infiltration of rainwater, and then may cause component
The host of damage or entire monitoring system shuts down extremely.Therefore, the power detecting protection mechanism that camera cable is arranged just becomes
The project of the application.
It is disclosed in Taiwan Patent TWI381511 in a kind of single pin multi-function signal detection method and this method
Used composition, disclose in the claim 6,17 and specification of this application a kind of input voltage for detecting power supply whether be
Over-voltage or under-voltage technology, but there is no the technology that the open cable for video camera carries out voltage detecting, also it is not disclosed in
Detect reaction movement when power supply is abnormal.
A kind of switching regulator (switching is disclosed in United States Patent (USP) US2013/0207625
Regulator), other than the technical characteristic of voltage-stablizer itself, also disclosed in claim 8,9 and specification
Pressure and under-voltage detection technique, but still without the technology of the open cable progress voltage detecting for video camera, also without open
Reaction movement when detecting that power supply is abnormal.
Summary of the invention
It is a primary object of the present invention to provide a kind of power protection system of camera cable, can detect video camera
Cable voltage it is whether abnormal, and camera power supply is closed when being abnormal situation.
Another object of the present invention is to provide a kind of power protection systems of camera cable, can be in video camera
The electric voltage exception of cable and after closing camera power supply, restart camera power supply after situation exclusion.
In order to achieve the above objectives, the present invention provides a kind of power protection system of camera cable, it includes: power supply is opened
Chip is closed, with enable end, power input and power output end, the enable end and enable signal source are electrically connected,
The cable of the power input and video camera is electrically connected, and the power output end and the video camera are electrically connected；Source point
Volt circuit is electrically connected simultaneously output source voltage with the power output end of the power switch chip；Low-voltage comparison circuit,
Be electrically connected and have output end with the source bleeder circuit, the low-voltage comparison circuit provide low reference voltage and with it is described
Source voltage is compared, when the source voltage is lower than the low reference voltage, from the output end of the low-voltage comparison circuit
It exports high levle signal and does not export high levle signal if the source voltage is not below the low reference voltage；High voltage compares
Circuit, is electrically connected with the source bleeder circuit and has output end, and the high voltage comparison circuit provides high reference voltage
And be compared with the source voltage, when the source voltage is higher than the high reference voltage, from the high voltage comparison circuit
Output end export high levle signal, if the source voltage does not export high levle signal not higher than the high reference voltage；Its
In, the high reference voltage is higher than the low reference voltage, the output end of the high voltage comparison circuit and the low-voltage ratio
Output end compared with circuit is electrically connected；And electric-controlled switch, output end and the height with the low-voltage comparison circuit
The output end of voltage comparator circuit is electrically connected, and is electrically connected with the enable end；Wherein, when the low-voltage comparison circuit
And when at least one of both described high voltage comparison circuits output high levle signal, the electric-controlled switch is controlled and is made
The enable end ground connection.
From the foregoing, it will be observed that the present invention is by carrying out the source voltage in camera cable with low reference voltage and high reference voltage
Compare, and after judging under-voltage or over-voltage, makes enable end ground connection to close the power switch chip, and then close camera shooting
Electromechanical source.It is whether abnormal thereby, it is possible to realize the voltage of the cable of detection video camera, and camera shooting is closed when being abnormal situation
The effect of electromechanical source, and it is possible to the cable of video camera electric voltage exception and after closing camera power supply, after situation exclusion
Restart camera power supply.
Detailed description of the invention
Fig. 1 is the partial component circuit diagram of a preferred embodiment of the invention, and indicates the circuit of power switch chip
Structure.
Fig. 2 is the circuit diagram of a preferred embodiment of the invention.
Fig. 3 is the flow chart of a preferred embodiment of the invention.
Fig. 4 is the waveform diagram of a preferred embodiment of the invention, and indicates state when source voltage is normal.
Fig. 5 is another waveform diagram of a preferred embodiment of the invention, and state when indicating source brownout.
Fig. 6 is the another waveform diagram of a preferred embodiment of the invention, and state when indicating source overtension.
(symbol description)
10: the power protection system of camera cable
11: power switch chip 111: enable end 112: power input
113: power output end 15: enable signal source 21: source bleeder circuit
211: voltage input end 212: voltage output end 31: low-voltage comparison circuit
311: output end 32: low-voltage bleeder circuit 321: voltage output end
34: the first operational amplifiers 41: high voltage comparison circuit 411: output end
42: high voltage bleeder circuit 421: voltage output end 44: second operational amplifier
51: electric-controlled switch 511: control terminal 512,513: conduction terminal
VH: high reference voltage VL: low reference voltage VS: source voltage
Specific embodiment
For the technical characterstic that the present invention will be described in detail, it is exemplified below preferred embodiment and attached drawing is cooperated to be illustrated.
As shown in Figures 1 to 4, a kind of power protection of camera cable provided by a preferred embodiment of the invention
System 10, mainly by power switch chip 11, source bleeder circuit 21, low-voltage comparison circuit 31, high voltage comparison circuit 41 with
And electric-controlled switch 51 is constituted.
The power switch chip 11 has enable end 111, power input 112 and power output end 113, the enable end
111 are electrically connected with enable signal source 15, and the cable electrical property (not shown) of the power input 112 and video camera (not shown) connects
It connects and receives power supply, the power output end 113 and video camera are electrically connected and provide power supply.The power switch chip 11 is in reality
When implementation, the chip of model UP7549TMA5 series or the chip of its equivalence replacement can be used.
The source bleeder circuit 21 has the voltage input being electrically connected with the power output end 113 of the power switch chip 11
End 211 and for output source voltage VS voltage output end 212.In actual implementation, which can be used two
A resistance (as shown in Figure 2) constitutes the primary structure of bleeder circuit.
The low-voltage comparison circuit 31 has low-voltage bleeder circuit 32 and the first operational amplifier 34, low-voltage partial pressure
Circuit 32 has the voltage output end 321 being electrically connected with the non-inverting input of first operational amplifier 34；First fortune
The voltage output end 212 of the reverse input end and the source bleeder circuit 21 of calculating amplifier 34 is electrically connected, and first operation is put
Output end 311 of the output end of big device 34 as the low-voltage comparison circuit 31.The voltage output of the low-voltage bleeder circuit 32
End 321 provides low reference voltage VL, and first operational amplifier 34 reference voltage VL low with this to source voltage VS is compared,
Also, when source voltage VS is lower than the low reference voltage VL, high levle signal is exported by the output end 311, if it is not, then not defeated
High levle signal out.In actual implementation, which can be used two resistance (as shown in Figure 2) to constitute
The primary structure of bleeder circuit.The effect of this technical characteristic is, when source voltage VS is lower than the low reference voltage VL
The brownout of source voltage VS is judged, to be in under-voltage or short-circuit state.In practice, which can be with
It is set as 2.97V~4.5V, which is only for example, and is not used to limit the application interest field.
The high voltage comparison circuit 41 has high voltage bleeder circuit 42 and second operational amplifier 44, high voltage partial pressure
Circuit 42 has the voltage output end 421 being electrically connected with the reverse input end of the second operational amplifier 44, second operation
The voltage output end 212 of the non-inverting input of amplifier 44 and the source bleeder circuit 21 is electrically connected, second operation amplifier
Output end 411 of the output end of device 44 as the high voltage comparison circuit 41, and the output end 411 of the high voltage comparison circuit 41
It is electrically connected with the output end 311 of the low-voltage comparison circuit 31.The voltage output end 421 of the high voltage bleeder circuit 42 provides
High reference voltage VH, which is compared source voltage VS with high reference voltage VH, also, works as
When source voltage VS is higher than high reference voltage VH, high levle signal is exported by the output end 411, if it is not, not exporting Gao Zhun then
Position signal.In addition, high reference voltage VH is higher than the low reference voltage VL.In actual implementation, the high voltage bleeder circuit 42
Two resistance (as shown in Figure 2) can be used to constitute the primary structure of bleeder circuit.The effect of this technical characteristic is, when this
When source voltage VS is higher than high reference voltage VH, the overtension of source voltage VS can be judged, to be in the state of over-voltage.
In practice, high reference voltage VH can be set as 3.6V~5.5V, which is only for example, and not be used to limit this
Apply for interest field.
By the explanation of above-mentioned low-voltage comparison circuit 31 and high voltage comparison circuit 41 it is found that in normal state, also
It is in the state of no under-voltage or over-voltage, source voltage VS should be set higher than the low reference voltage VL and lower than the high reference
Voltage VH.
The electric-controlled switch 51 has control terminal 511 and two conduction terminals 512,513, the control terminal 511 and the low-voltage
The output end 311 of comparison circuit 31 and the output end 411 of the high voltage comparison circuit 41 are electrically connected, and one of conduction terminal
512 are electrically connected with the enable end 111, another conduction terminal 513 ground connection.The electric-controlled switch 51 according to the control terminal 511 whether
High levle signal is received to control whether to be connected two conduction terminals 512,513, and then controls whether the enable end 111 connects
Ground.In actual implementation, which can be used transistor, also can be used other equivalence replacement components, such as after
Electric appliance or Metal Oxide Semiconductor Field Effect Transistor (MOSFET).
The use state of the present embodiment will be illustrated next in the structure that this concludes the description of the present embodiment.
Please refer to figs. 1 to 4, and after video camera starting and under normal operating condition, which provides height
Level signal activates the power switch chip 11.The power switch chip 11 mentions the video camera from the power output end 113
Power supply source, the source bleeder circuit 21 divide out source voltage VS from the power supply and export from the voltage output end 212, and by the low electricity
Pressure comparison circuit 31 and the high voltage comparison circuit 41 are compared.Since source voltage VS is higher than the low reference voltage VL and low
In high reference voltage VH, therefore, the output end 311,411 of the low-voltage comparison circuit 31 and the high voltage comparison circuit 41 is all
High levle signal will not be exported, which will not be activated, and then the enable end 111 will not be grounded, thus the power supply
Switch chip 11 continues to keep normal power supply state under actuating state.
When the power supply of the video camera is abnormal, for example, it is under-voltage or short-circuit when, source which is exported electricity
Pressure VS becomes too low lower than the low reference voltage VL, and therefore, the output end 311 of the low-voltage comparison circuit 31 exports high levle
Signal, but the output end 411 of the high voltage comparison circuit 41 will not export high levle signal, and the electric-controlled switch 51 is because of the Gao Zhun
Position signal and be activated, and make two conduction terminals 512,513 be connected and make the enable end 111 be grounded, the power switch chip
Therefore 11 close and no longer provide power supply to the cable of the video camera.In another situation, i.e., the power supply over-voltage of the video camera when,
Source voltage VS can be higher than high reference voltage VH, so that the output end 411 of the high voltage comparison circuit 41 exports high levle letter
Number, but the output end 311 of the low-voltage comparison circuit 31 will not export high levle signal, and this high levle signal equally can be with
It closes the power switch chip 11 and no longer provides power supply to the cable of the video camera.
After unusual condition exclusion, as long as starting the power switch chip 11 by the enable end 111 again, due to not having
Over-voltage or under-voltage problem, therefore source voltage VS is in normal level, therefore the electric-controlled switch 51 can work normally.
From the foregoing, it will be observed that the breakage of camera cable may cause the over-voltage or under-voltage of power supply, and the present invention can detecte
The supply voltage of camera cable whether over-voltage or under-voltage unusual condition, and close its power switch chip 11 when abnormal,
And then achieve the effect that the component for protecting main system damage it will not, and can be different to avoid the host of entire monitoring system
The situation often shut down.In addition, can also restart the power supply of video camera after unusual condition exclusion.
Claims (6)
1. a kind of power protection system of camera cable, characterized by comprising:
Power switch chip, with enable end, power input and power output end, the enable end and enable signal source
It is electrically connected, the cable of the power input and video camera is electrically connected, and the power output end and the video camera are electrical
Connection；
Source bleeder circuit is electrically connected simultaneously output source voltage with the power output end of the power switch chip；
Low-voltage comparison circuit is electrically connected with the source bleeder circuit and has output end, the low-voltage comparison circuit
Low reference voltage is provided and is compared with the source voltage, when the source voltage is lower than the low reference voltage, from described
The output end of low-voltage comparison circuit exports high levle signal, not defeated if the source voltage is not below the low reference voltage
High levle signal out；
High voltage comparison circuit is electrically connected with the source bleeder circuit and has output end, the high voltage comparison circuit
It provides high reference voltage to be simultaneously compared with the source voltage, when the source voltage is higher than the high reference voltage, from described
The output end of high voltage comparison circuit exports high levle signal, not defeated if the source voltage is not higher than the high reference voltage
High levle signal out；Wherein, the high reference voltage is higher than the low reference voltage, the output end of the high voltage comparison circuit
It is electrically connected with the output end of the low-voltage comparison circuit；And
Electric-controlled switch, it is electrical with the output end of the low-voltage comparison circuit and the output end of the high voltage comparison circuit
Connection, and be electrically connected with the enable end；
Wherein, when at least one of both described low-voltage comparison circuit and the high voltage comparison circuit output high levle letter
Number when, the electric-controlled switch is controlled and is grounded the enable end.
2. the power protection system of camera cable as described in claim 1, which is characterized in that
The source bleeder circuit has voltage input end and voltage output end, the voltage input end and the power switch chip
Power output end be electrically connected.
3. the power protection system of camera cable as claimed in claim 2, which is characterized in that
The low-voltage comparison circuit has low-voltage bleeder circuit and the first operational amplifier, the low-voltage bleeder circuit tool
There is the voltage output end being electrically connected with the non-inverting input of first operational amplifier, first operational amplifier
The voltage output end of reverse input end and the source bleeder circuit is electrically connected, and the output end of the low-voltage comparison circuit is institute
State the output end of the first operational amplifier.
4. the power protection system of camera cable as claimed in claim 2, which is characterized in that
The high voltage comparison circuit has high voltage bleeder circuit and second operational amplifier, the high voltage bleeder circuit tool
Have with the reverse input end of the second operational amplifier be electrically connected voltage output end, the second operational amplifier it is non-
The voltage output end of reverse input end and the source bleeder circuit is electrically connected, and the output end of the high voltage comparison circuit is institute
State the output end of second operational amplifier.
5. the power protection system of camera cable as described in claim 1, which is characterized in that
The electric-controlled switch has control terminal and two conduction terminals, the output of the control terminal and the low-voltage comparison circuit
The output end of end and the high voltage comparison circuit is electrically connected, also, one of them described conduction terminal and the enable end
It is electrically connected, another described conduction terminal ground connection.
6. the power protection system of camera cable as claimed in claim 5, which is characterized in that
The electric-controlled switch is transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910280052.1A CN109996064A (en) | 2019-04-09 | 2019-04-09 | The power protection system of camera cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910280052.1A CN109996064A (en) | 2019-04-09 | 2019-04-09 | The power protection system of camera cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109996064A true CN109996064A (en) | 2019-07-09 |
Family
ID=67131310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910280052.1A Pending CN109996064A (en) | 2019-04-09 | 2019-04-09 | The power protection system of camera cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109996064A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2924779Y (en) * | 2006-04-14 | 2007-07-18 | 李建 | Disconnecting switch with overvoltage-undervoltage protection function |
| CN203491680U (en) * | 2013-08-13 | 2014-03-19 | 上海三开电气有限公司 | Automatic reset electric leakage overvoltage/undervoltage protection circuit |
| CN105048425A (en) * | 2015-08-18 | 2015-11-11 | 李金宫 | Protection device and protection method of vehicle low-voltage power supply line |
-
2019
- 2019-04-09 CN CN201910280052.1A patent/CN109996064A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2924779Y (en) * | 2006-04-14 | 2007-07-18 | 李建 | Disconnecting switch with overvoltage-undervoltage protection function |
| CN203491680U (en) * | 2013-08-13 | 2014-03-19 | 上海三开电气有限公司 | Automatic reset electric leakage overvoltage/undervoltage protection circuit |
| CN105048425A (en) * | 2015-08-18 | 2015-11-11 | 李金宫 | Protection device and protection method of vehicle low-voltage power supply line |
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Application publication date: 20190709 |
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