CN211032453U - Power-down delay protection circuit applied to camera and vehicle-mounted equipment - Google Patents
Power-down delay protection circuit applied to camera and vehicle-mounted equipment Download PDFInfo
- Publication number
- CN211032453U CN211032453U CN201921305333.XU CN201921305333U CN211032453U CN 211032453 U CN211032453 U CN 211032453U CN 201921305333 U CN201921305333 U CN 201921305333U CN 211032453 U CN211032453 U CN 211032453U
- Authority
- CN
- China
- Prior art keywords
- module
- power
- resistor
- camera
- power supply
- 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.)
- Active
Links
Images
Landscapes
- Studio Devices (AREA)
Abstract
The utility model provides a be applied to power failure time delay protection circuit and mobile unit of camera, power failure time delay protection circuit includes: the device comprises a power supply module, an energy storage module, an anti-shake module and a current limiting module; the energy storage module is used for charging when the power supply module is connected, and discharging when the power supply module is not connected; when the power supply module is connected to the current limiting module and the voltage of a first power supply signal output by the power supply module is greater than a first preset voltage, the current limiting module performs current limiting processing on the first power supply signal to electrify the camera; when the power supply module has an abnormal power failure event, the anti-shake module controls the current limiting module to be conducted continuously, and current limiting processing is carried out on a second power supply signal formed by discharging of the energy storage module, so that the power-on continuity of the camera is guaranteed; the anti-shake module is used for carrying out anti-shake processing on the on-off control of the current limiting module, so that the second power supply signal is prevented from repeatedly electrifying the camera; the power-down delay protection circuit realizes the power-down delay protection function of the camera.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a power-down delay protection circuit applied to a camera and vehicle-mounted equipment.
Background
With the development of science and technology, the camera equipment becomes indispensable electronic equipment in daily life, images can be recorded and stored through the camera equipment so as to meet the visual requirements of people, the camera equipment has high and low manufacturing cost, and the camera equipment is universally applicable to different industrial technical fields; and the image pickup apparatus exerts various different circuit functions; taking the camera device in the vehicle-mounted field as an example, the vehicle-mounted camera device can not only record video in the normal running process of the vehicle to meet the actual running requirement of a user, but also prevent the vehicle from having a traffic accident through the vehicle-mounted camera device, and can use the vehicle-mounted camera device to take pictures at the scene of the traffic accident so as to keep the camera evidence of the traffic accident; the use of the image pickup apparatus is of great practical significance for improving the value of electronic products.
However, the image pickup apparatus includes a large number of electronic components, the image pickup apparatus must access direct current power to maintain a normal operating state, and the safety of power supply has an extremely important influence on the operating stability of the image pickup apparatus; however, the camera in the conventional technology can only realize the function of immediate on-off for the power supply, and once the power supply of the camera is abnormally powered down or the amplitude is too low, the camera is immediately stopped; the instant on-off function can cause that the photographing process of the camera equipment cannot be continued; in some special application places, such as traffic accidents, if the vehicle-mounted camera device has the working performance of power failure delay, the picture information acquired by the vehicle-mounted camera device in the power failure delay stage has important practical significance for the process of restoring the traffic accidents and the confirmation of the responsibility of the car owners.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the application provides a power-down delay protection circuit applied to a camera and a vehicle-mounted device, and aims to solve the problem that in the conventional technical scheme, a camera device cannot achieve a power-down delay function, which causes serious interference to continuity of a photographing process of the camera device, and thus compatibility and safety of the vehicle-mounted camera device are low.
The first aspect of the embodiment of the application provides a power-down delay protection circuit applied to a camera, which is connected with the camera, and the power-down delay protection circuit comprises:
the power supply module is used for outputting a first power supply signal;
the energy storage module is used for charging according to the power supply signal when the power supply module is connected, and discharging and generating a second power supply signal when the power supply module is not connected;
the anti-shake module is used for generating a switch control signal when the power supply module is connected and the voltage of the first power supply signal is greater than a first preset voltage; or when the power module is not connected and the voltage accessed by the camera is greater than a second preset voltage, generating the switch control signal; and
the current limiting module is connected with the energy storage module, the anti-shake module and the camera and is used for performing current limiting processing on the first power supply signal according to the switch control signal when the power supply module is connected so as to supply power to the camera; the current limiting module is further used for performing current limiting processing on the second power supply signal according to the switch control signal when the power supply module is not connected so as to supply power to the camera;
wherein the first preset voltage is greater than the second preset voltage.
In one embodiment, the anti-shake module includes:
the voltage division control unit is connected with the camera and used for carrying out voltage division processing on the first power supply signal when the power supply module is connected to obtain a first voltage division signal and carrying out voltage division processing on the voltage connected to the camera to obtain a second voltage division signal; and
and the switch control unit is connected with the voltage division control unit and the current limiting module and is used for generating the switch control signal when the voltage of the first voltage division signal and/or the voltage of the second voltage division signal is greater than a preset breakover voltage.
In one embodiment, the voltage division control unit includes:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first switching tube and a second switching tube;
the first end of the first resistor and the first end of the second resistor are used for being connected to the power module, the second end of the first resistor, the first end of the third resistor and the first end of the fourth resistor are connected to the switch control unit in a shared mode, and the second end of the fourth resistor is grounded;
the second end of the third resistor is connected with the first conducting end of the first switch tube, and the second conducting end of the first switch tube is grounded;
the control end of the first switch tube is connected with the first end of the fifth resistor, and the second end of the second resistor and the second end of the fifth resistor are connected with the first conducting end of the second switch tube in common;
a second conducting end of the second switching tube is grounded, a control end of the second switching tube is connected with a first end of the sixth resistor, and a first end of the seventh resistor and a first end of the eighth resistor are connected with a second end of the sixth resistor in a shared mode;
a second end of the eighth resistor is grounded;
and the second end of the seventh resistor is connected with the camera.
In one embodiment thereof, the switch control unit includes:
a ninth resistor, a tenth resistor, a third switching tube and a fourth switching tube;
the control end of the third switching tube is connected with the voltage division control unit, the first conducting end of the third switching tube and the control end of the fourth switching tube are connected with the first end of the ninth resistor in a sharing mode, and the second conducting end of the third switching tube is grounded;
a second end of the ninth resistor and a first end of the tenth resistor are connected to a first direct-current power supply in a shared mode, and a second end of the tenth resistor and a first conducting end of the fourth switching tube are connected to the current limiting module in a shared mode;
and the second conducting end of the fourth switching tube is grounded.
In one embodiment, the third switching tube is an NPN-type triode;
the fourth switching tube is an NPN type triode.
In one embodiment thereof, the energy storage module comprises at least one farad capacitor.
In one embodiment, the current limiting module comprises a current limiting chip;
the power input pin of the current limiting chip is used for connecting the power module and the energy storage module;
the power output pin of the current limiting chip is connected with the camera;
and a switch control pin of the current limiting chip is connected with the anti-shake module.
In one embodiment, the first preset voltage is 9.8V, and the second preset voltage is 7.00V.
A second aspect of the embodiments of the present application provides an in-vehicle apparatus, including:
the power failure delay protection circuit is described above; and
and the vehicle-mounted camera is connected with the power failure delay protection circuit.
In one embodiment, the power module includes an onboard battery.
The power-down delay protection circuit applied to the camera can supply power to the camera through the power supply module, and when the current limiting module is connected to the power supply module and the electric energy output by the power supply module meets the rated power supply requirement of the camera, the current limiting module carries out current limiting processing on the electric energy output by the power supply module so as to keep the safe power-on function of the camera; when the power supply module is abnormally powered off, the anti-shake module is used for detecting the electric energy accessed by the camera, so that the current limiting module can be used for continuously powering on the camera through the electric energy output by the energy storage module in the abnormal power-off period, and the continuity and stability of the electric energy access of the camera are guaranteed; the anti-shake module can keep the on-off control stability of the current limiting module in the event of abnormal power failure, and the problem that the camera is repeatedly powered on due to continuous rebound of electric energy output by the energy storage module is avoided; therefore, the camera has the function of power-down delay protection, and the camera has a higher application range and a higher practical value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power-down delay protection circuit applied to a camera according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an anti-shake module according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a voltage division control unit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of a switch control unit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an on-board device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, the "cameras" referred to herein are different types of cameras in the field, and the power-down delay protection circuit in the embodiment of the present application can be applied to cameras in various technical fields, and implement a power-down delay protection function, and has high compatibility.
Referring to fig. 1, a schematic structural diagram of a power-down delay protection circuit 10 applied to a camera provided in an embodiment of the present application is shown, where the camera includes a camera, the power-down delay protection circuit 10 is connected to a camera 20, and the power-down delay protection circuit 10 can not only process electric energy in a normal power supply stage and power up the camera 20, but also can perform delay power supply on the camera 20 in an abnormal power-down stage, so as to ensure power-up continuity and stability of the camera 20 and improve an application range of a camera function of the camera 20; for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:
the power-down delay protection circuit 10 includes: a power supply module 101, an energy storage module 102, an anti-shake module 103, and a current limiting module 104.
The power module 101 is configured to output a first power signal.
It should be noted that, the first power signal output by the power module 101 has voltage fluctuation; for example, the power module 101 converts the electric energy output by the commercial power to obtain a first power signal, then, during an initial start-up phase of the electric energy conversion of the power module 101, the voltage of the first power signal gradually rises from 0 to 12V until the voltage of the first power signal output by the power module 101 is maintained at 12V, and when the power module 101 is in a power-down phase, the voltage of the first power signal is gradually reduced from 12V to 0V; therefore, direct current power supply can be carried out on the electronic component through the first power supply signal, and the operation safety of the electronic component is guaranteed.
In the embodiment, the power module 101 provides electric energy, the operation is simple and convenient, once the electronic component is electrically connected with the power module 101, rated and safe electric energy can be immediately provided for the electronic component through the first power signal; the delay protection circuit 10 has higher power supply stability and compatibility, and better controllability.
The energy storage module 102 is configured to perform charging according to the power signal when the power module 101 is connected, and perform discharging and generate a second power signal when the power module 101 is not connected.
The energy storage module 102 has an electric energy storage function, and when the power supply module 101 establishes electric power connection with the energy storage module 102, the energy storage module 102 accesses electric energy to start a charging step; when the power module 101 is electrically disconnected from the energy storage module 102, the energy storage module 102 discharges to form a second power signal, and the camera 20 can be powered by the second power signal, so that the power supply stability and continuity of the camera 20 are guaranteed; therefore, in the embodiment, the energy storage module 102 can store electric energy with a certain capacity in advance, so as to ensure that the camera 20 can still be powered through the storage module 102 when the power supply module 101 is abnormally powered down, thereby improving the charging efficiency of the camera 20.
The anti-shake module 103 is configured to generate a switch control signal when the power module 101 is turned on and the voltage of the first power signal is greater than a first preset voltage.
Specifically, the anti-shake module 103 is further configured to not generate the switch control signal when the voltage of the first power signal is less than or equal to the first preset voltage when the power module 101 is turned on.
Optionally, the first preset voltage is 9.8V; for example, the first preset voltage is a voltage turn-on threshold of the current limiting module 104, and only when the voltage applied to the current limiting module 104 is greater than 9.8V, the current limiting module 104 is turned on and performs a corresponding circuit function.
When the voltage of the first power signal is greater than the first preset voltage, it indicates that the electric energy output by the power module 101 meets the conduction condition of the power supply branch of the camera 20, and the power supply branch of the camera 20 can be conducted through the switch control signal generated by the anti-shake module 103 to wait for the power supply process of the camera 20 to be executed; therefore, in the embodiment, the voltage of the electric energy output by the power module 101 is detected in real time through the anti-shake module 103 to determine whether the electric energy output by the power module 101 meets the condition of starting the charging of the camera 20, so that the power supply safety of the camera 20 and the application range of the power failure delay protection circuit 10 are improved.
The current limiting module 104 is connected to the energy storage module 102, the anti-shake module 103, and the camera 20, and the current limiting module 104 is configured to perform current limiting processing on the first power signal according to the switch control signal when the power module 101 is switched in, so as to supply power to the camera 20.
Specifically, when the current limiting module 104 does not receive the switch control signal, the current limiting module 104 is turned off, and the current limiting module 104 does not perform the current limiting process on the first power signal.
Specifically, the current limiting module 104 is connected to an electric energy input end of the camera 20, when the anti-shake module 103 outputs a switch control signal to the current limiting module 104, the current limiting module 104 can be turned on by the switch control signal, the current limiting module 104 can perform a current limiting processing function, when the power supply module 101 is electrically connected to the current limiting module 104, the current limiting module 104 performs a current limiting processing on the first power supply signal, the current of the first power supply signal after the current limiting processing is greater than or equal to the rated current of the camera 20, the camera 20 can access the rated electric energy and maintain a safe power-on function, and the camera 20 is prevented from overcurrent caused by the electric energy output by the power supply module 101; therefore, when the voltage of the first power signal is greater than the voltage turn-on threshold of the current limiting module 104, and the power module 101 is connected with electric energy and works normally, the current limiting module 104 can perform current limiting protection on the first power signal; therefore, in the normal power supply stage of the power module 101, the camera 20 can access the rated power and maintain the normal photographing function, thereby improving the power-on safety of the camera 20.
The anti-shake module 103 is further configured to generate a switch control signal when the power module 101 is not connected and the voltage applied to the camera 20 is greater than a second preset voltage.
Optionally, the second preset voltage is 7.00V, for example, the second preset voltage is a normal working voltage threshold of the camera 20, the camera 20 is connected to the electric energy through the electric energy input terminal to maintain a stable working state, and only when the voltage connected to the electric energy input terminal of the camera 20 is greater than 7.00V, the camera 20 can be in a rated working state.
Optionally, the anti-shake module 103 is further connected to the energy storage module 102, if a power failure event occurs in the power supply module 101, the anti-shake module 103 detects a voltage that the camera 20 is connected to, and when the voltage that the camera 20 is connected to is greater than a second preset voltage, it indicates that the camera 20 meets a condition for continuing to supply power, and the anti-shake module 103 continues to generate a switch control signal, so that a power supply branch of the camera 20 can still be kept in a conducting state, and the power supply module 101 executes a delayed shutdown operation in a power failure stage.
The current limiting module 104 is further configured to perform current limiting processing on the second power signal according to the switch control signal when the power module 101 is not connected, so as to supply power to the camera 20.
The first preset voltage is greater than the second preset voltage.
When the power failure event occurs in the power supply module 101, the camera 20 is continuously powered in a delayed manner by the discharging electric energy of the energy storage module 102; in addition, in the discharging process of the energy storage module 102, the electric energy stored in the energy storage module 102 will gradually decrease, and then the voltage of the second power supply signal will also gradually decrease, when the voltage of the second power supply signal output by the current limiting module 104 is less than or equal to a second preset voltage, it indicates that the camera 20 does not meet the condition of continuing to supply power, at this time, the anti-shake module 103 does not generate a switch control signal, and then the current limiting module 104 is turned off, and the camera 20 loses power; therefore, in the power-down stage of the power module 101, the anti-shake module 103 can detect whether the discharge electric energy of the energy storage module 102 meets the safe working condition of the camera 20 in real time, so that the camera 20 is prevented from being powered on repeatedly due to the fluctuation of the discharge electric energy of the energy storage module 102; for example, after a period of discharging, although the energy storage module 102 continues to release a small amount of electric energy, since the discharging voltage of the energy storage module 102 does not meet the normal power supply requirement of the camera 20, the current limiting module 104 is cut off by the anti-shake module 103, so as to ensure that the camera 20 can be delayed for a period of time in the power-down phase to maintain a normal photographing state.
In this embodiment, the first preset voltage and the second preset voltage are both preset voltages, and the current limiting processing state of the current limiting module 104 can be started only when the voltage output by the power module 101 is greater than the first preset voltage, so that the camera 20 can be normally powered by the electric energy output by the power module 101; if the power module 101 is abnormally powered down, for example, the power module 101 is pulled out, once the power module is abnormally powered down, the camera 20 is continuously powered by the discharging electric energy of the energy storage module 102, so that the power-on continuity and stability of the camera 20 are ensured, further, the power-down delay protection circuit 10 can continuously power the camera 20, and the camera 20 can also keep working for a period of time when the power module 101 is disconnected; when the discharging electric energy of the energy storage module 102 is gradually consumed along with the discharging time, the electric energy supply of the camera 20 can be cut off through the anti-shake module 103, so that the defect that the camera 20 is repeatedly powered up due to the fluctuation of the discharging electric energy of the energy storage module 102 is avoided; the embodiment can make the photographing function of the camera 20 completely meet the actual requirements of the user.
In the structural schematic of the power-down delay protection circuit 10 shown in fig. 1, the power-down delay protection circuit 10 can have a power-down delay protection function for the camera 20, so as to maintain that the camera 20 can operate for a period of time by means of the discharging electric energy of the energy storage module 102 when encountering a power-down event, thereby ensuring the working stability and safety of the camera 20; on one hand, if the power module 101 is normally connected and maintains power supply, the current limiting module 104 performs current limiting processing on the electric energy output by the power module 101 to safely power up the camera 20; on the other hand, after the power failure event occurs in the power supply module 101, the current limiting module 104 can be continuously maintained to be conducted through the anti-shake module 103, and then the camera 20 is supplied with the rated power through the discharging electric energy of the energy storage module 102, so as to maintain the delayed working performance of the camera 20 until the discharging electric energy of the energy storage module 102 cannot meet the rated power supply requirement of the camera 20; therefore, the camera 20 in this embodiment can continuously maintain the power-on state for a period of time after the power-down event, so that the working continuity and stability of the camera 20 are improved, and the camera 20 can be applicable to various different industrial technical fields and meet the photographing requirements of users; therefore, the problems that a camera in the traditional technology can be switched on and off only in real time, the continuity and the stability of photographing cannot be guaranteed, once the camera receives external impact, the camera is powered off and shut down, a picture after power failure cannot be photographed, the safety and the reliability are low, and the camera is difficult to be universally applied are effectively solved.
As an optional implementation manner, fig. 2 shows a schematic structure of the anti-shake module 103 provided in this embodiment, please refer to fig. 2, where the anti-shake module 103 includes: a voltage division control unit 1031 and a switch control unit 1032; the voltage division control unit 1031 is connected to the camera 20, and the voltage division control unit 1031 is configured to, when the power module 101 is connected, perform voltage division processing on the first power signal to obtain a first voltage division signal, and perform voltage division processing on a voltage connected to the camera 20 to obtain a second voltage division signal.
Specifically, the voltage division control unit 1031 is connected to the power input end of the camera 20, wherein the voltage division control unit 1013 has a voltage division processing function, so that voltage division access and processing of power are realized; on the one hand, if the power module 101 is inserted into the voltage division control unit 1031 and the current limiting module 104, the voltage division control unit 1031 performs voltage division processing on the electric energy output by the power module 101; on the other hand, if the power input terminal of the camera 20 is connected to power, the power input terminal of the camera 20 is subjected to voltage division processing by the voltage division control unit 1031; therefore, the first voltage division signal and the second voltage division signal obtained through the voltage division processing by the voltage division control unit 1031 can respectively judge whether the camera 20 satisfies the charging function, so that the accuracy and stability of the power-on control of the camera 20 are improved.
The switch control unit 1032 is connected to the voltage division control unit 1031 and the current limiting module 104, and the switch control unit 1032 is configured to generate a switch control signal when the voltage of the first voltage division signal and/or the voltage of the second voltage division signal is greater than a preset on-state voltage.
Specifically, the switch control unit 1032 is configured to not generate the switch control signal when both the voltage of the first divided voltage signal and the voltage of the second divided voltage signal are less than or equal to the preset on voltage.
The switch control unit 1032 in this embodiment has a signal conversion function, and the electric energy transmission state of the current limiting module 104 can be controlled through the switch control unit 1032; if the power module 101 is inserted into the current limiting module 104 and the voltage of the first power signal meets the voltage conduction condition of the current limiting module 104, or if the power board module 101 has a power failure event and the voltage accessed by the camera 20 meets the requirement of continuous power supply, when any one of the two conditions is met, the switch control signal is output to the current limiting module 104 through the switch control unit 1032 so that the current limiting module 104 is conducted, and the electric energy can be output to the camera 20 through the current limiting module 104 so as to stably supply power to the camera 20 for a long time; therefore, in the embodiment, the current limiting module 104 can still be kept on for a period of time after the power down event occurs through the switch control unit 1032 according to the voltage dividing result of the voltage dividing control unit 1031, power is supplied to the camera 20 in a delayed manner, so that the power control stability and the safety of the power down delay protection circuit 10 are improved, and when the discharging power of the energy storage module 102 no longer meets the rated power-on requirement of the camera 20, the power input state of the current limiting module 104 is immediately cut off through the switch control unit 1032, the power input stability and the safety of the camera 20 are ensured, and the control accuracy of the power supply state of the camera 20 is improved.
As an optional implementation manner, fig. 3 shows a schematic circuit schematic structure of the voltage division control unit 1031 provided in this embodiment, please refer to fig. 3, the voltage division control unit 1031 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first switch tube M1 and a second switch tube M1.
The first end of the first resistor R1 and the first end of the second resistor R2 are used for being connected to the power module 101, the second end of the first resistor R1, the first end of the third resistor R3 and the first end of the fourth resistor R4 are commonly connected to the switch control unit 1032, and the second end of the fourth resistor R4 is connected to the GND.
Whether the power module 101 is connected or not can be detected through the first end of the first resistor R1 and the first end of the second resistor R2, so that accurate judgment of a power failure event of the power module 101 is achieved; and after the electronic components in the voltage division control unit 1031 complete the voltage division sampling processing, the voltage division control unit 1031 can output the first voltage division signal and/or the second voltage division signal to the switch control unit 1032, which ensures the transmission efficiency and transmission accuracy of the voltage division signals.
The second terminal of the third resistor R3 is connected to the first conducting terminal of the first switch M1, and the second conducting terminal of the first switch M3 is connected to the ground GND.
The control end of the first switch tube M1 is connected to the first end of the fifth resistor R5, and the second end of the second resistor R2 and the second end of the fifth resistor R5 are commonly connected to the first conducting end of the second switch tube M2.
The second conducting end of the second switch tube M2 is grounded GND, the control end of the second switch tube M2 is connected to the first end of the sixth resistor R6, and the first end of the seventh resistor R7 and the first end of the eighth resistor R8 are commonly connected to the second end of the sixth resistor R6.
A second terminal of the eighth resistor R8 is connected to ground GND.
The second end of the seventh resistor R7 is connected with the camera 20; specifically, the second end of the seventh resistor R7 is connected to the power input end of the camera 20.
Optionally, the first switch tube M1 and the second switch tube M2 have the same voltage conduction characteristics, for example, the first switch tube M1 and the second switch tube M2 are both driven to be turned on by a high level, and when the control terminal of the first switch tube M1 and the control terminal of the second switch tube M2 are both switched to a high level, the first switch tube M1 and the second switch tube M2 are both turned on.
Optionally, the first switching tube M1 is an MOS tube or an audion, and the second switching tube M2 is an MOS tube or an audion; illustratively, the first switch M1 is an NPN transistor, a base of the NPN transistor is a control terminal of the first switch M1, a collector of the NPN transistor is a first conduction terminal of the first switch M1, and an emitter of the NPN transistor is a second conduction terminal of the first switch M1.
As an alternative implementation, fig. 4 shows a schematic circuit schematic structure of the switch control unit 1032 provided in this embodiment, and referring to fig. 4, the switch control unit 1032 includes: a ninth resistor R9, a tenth resistor R10, a third switch tube M3 and a fourth switch tube M4.
The control end of the third switching tube M3 is connected to the voltage division control unit 1031, and then the voltage division control unit 1031 can output the voltage of the first voltage division signal and/or the second voltage division signal to the switch control unit 1032, so as to complete the voltage detection function of the voltage division signal; the first conducting terminal of the third switching tube M3 and the control terminal of the fourth switching tube M4 are commonly connected to the first terminal of the ninth resistor R9, and the second conducting terminal of the third switching tube M3 is grounded GND.
A second end of the ninth resistor R9 and a first end of the tenth resistor R10 are commonly connected to the first dc power supply, and a second end of the tenth resistor R10 and a first conducting end of the fourth switch transistor M4 are commonly connected to the current limiting module 104; when the switch control unit 1032 completes the voltage determination function according to the voltage of the first voltage division signal and/or the voltage of the second voltage division signal, the on or off state of the current limiting module 104 is changed.
Optionally, the first dc power supply is a 1V-10V dc power supply; can ensure the control security and the accuracy nature of inside each electronic components of on-off control unit 1032 through first DC power supply, camera 20 has higher power supply control security.
The second conducting terminal of the fourth switching tube M4 is grounded GND.
Optionally, the third switching tube M3 is an NPN-type triode; the base of the NPN transistor is the control end of the third switching transistor M3, the collector of the NPN transistor is the first conducting end of the third switching transistor M3, and the emitter of the NPN transistor is the second conducting end of the third switching transistor M3.
The fourth switching tube M4 is an NPN transistor.
The third switching tube M3 and the fourth switching tube M4 in this embodiment have the same voltage conduction characteristic, so as to implement accurate detection and judgment functions for the voltage of the first divided voltage signal and/or the voltage of the second divided voltage signal.
To better explain the principle of determining the voltage of the first power signal and the voltage accessed by the camera 20 by the voltage division control unit 1031 and the switch control unit 1032 in this embodiment, the following describes the operating principle of each electronic component in the anti-shake module 103 by a specific example with reference to fig. 3 and fig. 4, and specifically includes the following steps:
in this embodiment, the first switch transistor M1, the second switch transistor M2, the third switch transistor M3 and the fourth switch transistor M4 are all driven to be turned on at a high level.
At the initial stage of powering on the camera 20, the voltage at the power input end of the camera 20 is 0V, and if the power module 101 is inserted into the first end of the first resistor R1 and the first end of the second resistor R2, and the first switch tube M1 is turned on, it is equivalent to that the resistor formed by connecting the third resistor R3 and the fourth resistor R4 in parallel and the first resistor R1 divide the voltage of the first power signal by a first voltage division signal, and further the third switch tube M3 can be controlled to be turned on or turned off by the first voltage division signal; when the first power signal is greater than the first preset voltage, the third switching tube M3 is controlled to be turned on through the first voltage dividing signal, the level of the control end of the fourth switching tube M4 is pulled low, the fourth switching tube M4 is turned off, a high level is output through the first direct current power supply, so that the current limiting module 104 is turned on, and then the power module 101 is inserted into the current limiting module 104, and the electric energy output by the power module 101 meets the turn-on condition of the current limiting module 104, so that the current limiting processing is performed on the first power signal through the current limiting module 104, so as to supply power to the camera 20.
On the contrary, if the power module 101 is inserted into the current limiting module 104, but the voltage of the first power signal is not greater than the turn-on voltage of the current limiting module 104, and after the voltage division control unit 1031 performs the voltage division processing on the first power signal, the voltage of the first divided signal is less than or equal to the turn-on voltage of the third switching tube M3, then the third switching tube M3 is turned off, the fourth switching tube M4 is turned on by the dc power output by the first dc power supply, the potential of the second end of the tenth resistor R10 is pulled down to the ground GND, the low level output by the switch control unit 1032 turns off the current limiting module 104, so as to ensure the power supply safety and compatibility of the camera 20, and the power supply state of the camera 20 has higher adjustability and flexibility.
In the stable power-on phase of the camera 20, when the power module 101 is stably inserted into the current-limiting module 102 and the first power signal meets the safety power supply requirement of the camera 20, the switch control unit 1032 turns on the current-limiting module 104, so that the camera 20 can access stable electric energy and realize a normal photographing function.
When the camera 20 is in a power-down stage, the power module 101 is not connected to the current limiting module 104 and the voltage division control unit 1031, and voltage division processing is performed on the voltage connected to the power input end of the camera 20 through the seventh resistor R7 and the eighth resistor R8 to obtain a second voltage division signal; and at the moment of power failure of the power module 101, the second switching tube M2 is turned on, the first switching tube M1 is turned off, residual charges on the power supply branch of the camera 20 will cause the fourth switching tube M4 to be turned on, at this time, the current limiting module 104 is continuously turned on by a switch control signal output by the switch control unit 1032, and the camera 20 is continuously supplied with power by the discharging electric energy of the energy storage module 102, so that the camera 20 can still maintain power supply within a period of time after the power failure of the power module 101, and the effect of delayed shutdown is achieved.
With the discharging of the energy storage module 102, the voltage of the second power signal output by the energy storage module 102 also gradually decreases, and the voltage of the second power signal after the current limiting processing output by the current limiting module 104 also decreases, so that when the voltage accessed by the power input end of the camera 20 is less than or equal to the normal working voltage threshold of the camera 20, the voltage accessed by the power input end of the camera 20 is divided by the voltage division control unit 1031, the third switching tube M3 is turned off, the current limiting module 104 is immediately turned off, and the camera 20 is powered off and stopped; the partial voltage control unit 1031 and the switch control unit 1032 can prevent the problem that the camera 20 is frequently powered up due to fluctuation of the discharge electric energy of the energy storage module 102; when the current limiting module 104 is turned off, although the discharging voltage of the energy storage module 102 rebounds, the current limiting module 104 cannot be turned on by the voltage rebounded by the energy storage module 102, so that the physical safety of the camera 20 is further ensured.
As an alternative embodiment, the energy storage module 102 comprises at least one farad capacitor.
The farad capacitor is used as a chemical energy storage element, and realizes a high-capacity energy storage function through polarized electrolyte; the farad capacitor has the characteristics of high charging speed, large stored electric quantity, long service life and the like; therefore, in the embodiment, the electric energy is stored through at least one farad capacitor, and then when the power module 101 has a power failure event, the second power signal formed by discharging through the farad capacitor can ensure the power-on function of the camera 20, and the camera 20 has a longer power failure delay time, and the camera 20 can maintain a longer working time after the power failure time, so as to bring better use experience to a user.
As an alternative embodiment, the current limiting module 104 includes a current limiting chip; the power input pin of the current-limiting chip is used for connecting the power module 191 and the energy storage module 102.
The power output pin of the current-limiting chip is connected to the camera 20, and specifically, the power output pin of the current-limiting chip is connected to the power input terminal of the camera 20.
The switch control pin of the current-limiting chip is connected with the anti-shake module 193.
Optionally, the type of the current-limiting chip is RT9701YB1721 or P L2700, in this embodiment, the anti-shake module 103 controls the operating state of the current-limiting chip, and the first power signal or the second power signal after current-limiting processing by the current-limiting chip ensures the working stability and safety of the camera 20, so that the power supply performance of the camera 20 has higher compatibility, and the circuit structure of the power-down delay protection circuit 10 is simplified.
Fig. 5 shows a structural schematic diagram of the vehicle-mounted device 50 provided in the present embodiment, and referring to fig. 5, the vehicle-mounted device 50 includes: as described above, the power-down delay protection circuit 10 and the vehicle-mounted camera 501, the vehicle-mounted camera 501 is connected to the power-down delay protection circuit 10; the vehicle-mounted camera 501 can be normally powered through the power-down delay protection circuit 10, and when the vehicle-mounted camera 501 is abnormally powered down, the vehicle-mounted camera 501 can still be normally photographed within a period of time through the power-down delay protection circuit 10, so that the stability and the reliability of the photographing function of the vehicle-mounted camera 501 are improved.
Optionally, the power module 101 includes an on-vehicle battery; furthermore, in the embodiment, the vehicle-mounted camera 501 can be powered through the vehicle-mounted battery, so that the power failure delay protection function is achieved, and the service efficiency of the electric energy in the vehicle is improved.
In summary, the power-down delay protection circuit 10 in the embodiment of the present application can greatly ensure the power supply safety and effectiveness of the camera, so that the camera can have a longer photographing function to meet the actual photographing requirement of the user; in the embodiment of the application, the power-down delay protection circuit 10 is applied to the vehicle-mounted equipment, and the characteristic and stability of delay closing of the power-down delay protection circuit is important as a vehicle-mounted camera bearing the most important video recording function; if the vehicle-mounted battery is disconnected, the vehicle-mounted camera can be turned off after a delay of several seconds, the video can be turned back for several seconds, and the several-second video plays an important role in recovering the traffic accident scene and determining responsibility, so that the safety and the use value of the vehicle-mounted equipment are positively promoted, and the practical value is high; the problems that in the prior art, the power supply stability of a camera is low, once a power failure event occurs, the camera is immediately powered off and shut down, and the stability and the safety of photographing are low are effectively overcome.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. The utility model provides a be applied to power failure time delay protection circuit of camera, is connected with the camera, its characterized in that, power failure time delay protection circuit includes:
the power supply module is used for outputting a first power supply signal;
the energy storage module is used for charging according to the power supply signal when the power supply module is connected, and discharging and generating a second power supply signal when the power supply module is not connected;
the anti-shake module is used for generating a switch control signal when the power supply module is connected and the voltage of the first power supply signal is greater than a first preset voltage; or when the power module is not connected and the voltage accessed by the camera is greater than a second preset voltage, generating the switch control signal; and
the current limiting module is connected with the energy storage module, the anti-shake module and the camera and is used for performing current limiting processing on the first power supply signal according to the switch control signal when the power supply module is connected so as to supply power to the camera; the current limiting module is further used for performing current limiting processing on the second power supply signal according to the switch control signal when the power supply module is not connected so as to supply power to the camera;
wherein the first preset voltage is greater than the second preset voltage.
2. The power down delay protection circuit of claim 1, wherein the anti-jitter module comprises:
the voltage division control unit is connected with the camera and used for carrying out voltage division processing on the first power supply signal when the power supply module is connected to obtain a first voltage division signal and carrying out voltage division processing on the voltage connected to the camera to obtain a second voltage division signal; and
and the switch control unit is connected with the voltage division control unit and the current limiting module and is used for generating the switch control signal when the voltage of the first voltage division signal and/or the voltage of the second voltage division signal is greater than a preset breakover voltage.
3. The power-down delay protection circuit of claim 2, wherein the voltage division control unit comprises:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first switching tube and a second switching tube;
the first end of the first resistor and the first end of the second resistor are used for being connected to the power module, the second end of the first resistor, the first end of the third resistor and the first end of the fourth resistor are connected to the switch control unit in a shared mode, and the second end of the fourth resistor is grounded;
the second end of the third resistor is connected with the first conducting end of the first switch tube, and the second conducting end of the first switch tube is grounded;
the control end of the first switch tube is connected with the first end of the fifth resistor, and the second end of the second resistor and the second end of the fifth resistor are connected with the first conducting end of the second switch tube in common;
a second conducting end of the second switching tube is grounded, a control end of the second switching tube is connected with a first end of the sixth resistor, and a first end of the seventh resistor and a first end of the eighth resistor are connected with a second end of the sixth resistor in a shared mode;
a second end of the eighth resistor is grounded;
and the second end of the seventh resistor is connected with the camera.
4. The power-down delay protection circuit of claim 2, wherein the switch control unit comprises:
a ninth resistor, a tenth resistor, a third switching tube and a fourth switching tube;
the control end of the third switching tube is connected with the voltage division control unit, the first conducting end of the third switching tube and the control end of the fourth switching tube are connected with the first end of the ninth resistor in a sharing mode, and the second conducting end of the third switching tube is grounded;
a second end of the ninth resistor and a first end of the tenth resistor are connected to a first direct-current power supply in a shared mode, and a second end of the tenth resistor and a first conducting end of the fourth switching tube are connected to the current limiting module in a shared mode;
and the second conducting end of the fourth switching tube is grounded.
5. The power-down delay protection circuit according to claim 4, wherein the third switching tube is an NPN type triode;
the fourth switching tube is an NPN type triode.
6. The power down delay protection circuit of claim 1, wherein the energy storage module comprises at least one farad capacitor.
7. The power-down delay protection circuit of claim 1, wherein the current limiting module comprises a current limiting chip;
the power input pin of the current limiting chip is used for connecting the power module and the energy storage module;
the power output pin of the current limiting chip is connected with the camera;
and a switch control pin of the current limiting chip is connected with the anti-shake module.
8. The power-down delay protection circuit of claim 1, wherein the first predetermined voltage is 9.8V and the second predetermined voltage is 7.00V.
9. An in-vehicle apparatus, characterized by comprising:
the power down delay protection circuit of any of claims 1-8; and
and the vehicle-mounted camera is connected with the power failure delay protection circuit.
10. The in-vehicle apparatus according to claim 9, wherein the power supply module includes an in-vehicle battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921305333.XU CN211032453U (en) | 2019-08-12 | 2019-08-12 | Power-down delay protection circuit applied to camera and vehicle-mounted equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921305333.XU CN211032453U (en) | 2019-08-12 | 2019-08-12 | Power-down delay protection circuit applied to camera and vehicle-mounted equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211032453U true CN211032453U (en) | 2020-07-17 |
Family
ID=71540127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921305333.XU Active CN211032453U (en) | 2019-08-12 | 2019-08-12 | Power-down delay protection circuit applied to camera and vehicle-mounted equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211032453U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701769A (en) * | 2020-12-30 | 2021-04-23 | 广州路派电子科技有限公司 | Circuit module and system for protecting complete video for vehicle |
| CN113665505A (en) * | 2021-08-18 | 2021-11-19 | 远峰科技股份有限公司 | Vehicle-mounted multimedia display system |
| CN114697828A (en) * | 2020-12-31 | 2022-07-01 | 广州艾美网络科技有限公司 | Power amplifier control circuit, power supply control circuit and audio equipment |
-
2019
- 2019-08-12 CN CN201921305333.XU patent/CN211032453U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701769A (en) * | 2020-12-30 | 2021-04-23 | 广州路派电子科技有限公司 | Circuit module and system for protecting complete video for vehicle |
| CN112701769B (en) * | 2020-12-30 | 2023-06-30 | 广州路派电子科技有限公司 | Circuit module and system for protecting complete video for vehicle |
| CN114697828A (en) * | 2020-12-31 | 2022-07-01 | 广州艾美网络科技有限公司 | Power amplifier control circuit, power supply control circuit and audio equipment |
| CN113665505A (en) * | 2021-08-18 | 2021-11-19 | 远峰科技股份有限公司 | Vehicle-mounted multimedia display system |
| CN113665505B (en) * | 2021-08-18 | 2023-08-29 | 远峰科技股份有限公司 | Vehicle-mounted multimedia display system based on CAN network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211032453U (en) | Power-down delay protection circuit applied to camera and vehicle-mounted equipment | |
| CN108123509B (en) | Charging control method and related device thereof | |
| CN107491155B (en) | Hard reset control system and method for vehicle-mounted information terminal | |
| KR102617933B1 (en) | Intelligent control system, emergency starting power supply, and intelligent battery clip | |
| JP3329017B2 (en) | Power supply circuit and method | |
| CN109980722B (en) | Power supply control device | |
| JP2006331953A (en) | Battery protection method and battery protection circuit | |
| US8058912B2 (en) | Electronic device and signal generator thereof | |
| CN204810138U (en) | Terminal equipment's automation start shooting circuit and terminal equipment | |
| US9783139B2 (en) | Switch monitoring circuit | |
| CN117022159A (en) | Power supply switching system, power supply switching method, electronic device, readable storage medium and vehicle | |
| CN113809812A (en) | Double-battery circuit, control method thereof and electronic equipment | |
| CN110733446A (en) | double-control hierarchical power management electronic license plate | |
| US20120175972A1 (en) | System and method for battery saver | |
| US11693437B1 (en) | Electronic device | |
| CN107769277B (en) | Constant-current control charging system and method | |
| WO2022105411A1 (en) | Intelligent connecting apparatus, starting power supply device, and battery clip device | |
| US20150015067A1 (en) | Control circuit and electronic device using same | |
| CN211351688U (en) | ACC trigger control's undervoltage protection circuit, two mesh camera devices and autopilot system | |
| KR20180126307A (en) | Black box device | |
| CN209913482U (en) | Undervoltage protection circuit, binocular camera device and automatic driving system | |
| CN109510959B (en) | Control method and control system for preventing laser television from overheating | |
| CN110943720B (en) | Automatic shutdown circuit of equipment and equipment | |
| CN113676168A (en) | Accidental start prevention circuit and electric appliance after power restoration | |
| CN205070394U (en) | Electric automobile feed protection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |