CN111935406A - Power-off protection system for preventing data loss when camera power failure - Google Patents
Power-off protection system for preventing data loss when camera power failure Download PDFInfo
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- CN111935406A CN111935406A CN202010839144.1A CN202010839144A CN111935406A CN 111935406 A CN111935406 A CN 111935406A CN 202010839144 A CN202010839144 A CN 202010839144A CN 111935406 A CN111935406 A CN 111935406A
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- 238000013500 data storage Methods 0.000 claims abstract description 48
- 230000000087 stabilizing effect Effects 0.000 claims description 35
- 238000007726 management method Methods 0.000 claims description 31
- 238000005457 optimization Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 101100498818 Arabidopsis thaliana DDR4 gene Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
Abstract
The invention discloses a power-off protection system for preventing data loss when a camera is powered off, which comprises a first power module for providing working voltage for each module of the whole camera, a second power module started when the first power module is powered off, and an important data storage module; the first power supply module is connected with the second power supply module through a second connecting circuit; the second power supply module is connected with the important data storage module through the third connecting circuit, and when the first power supply module is powered on, the third connecting circuit is controlled to be in a non-conducting state by the first power supply module, and when the first power supply module is powered off, the second power supply module automatically discharges to enable the third connecting circuit to be in a conducting state to provide working voltage for the important data storage module.
Description
Technical Field
The invention relates to the field of data storage, in particular to a power-off protection system for preventing data loss when a camera is powered off.
Background
With the rapid development of industrial business in China, DDR memory banks are used as common electronic equipment and are applied more and more widely. Because the DDR memory bank has the advantage of higher read-write speed than the read-write speed of a medium such as a FLASH/hard disk which is not lost when power is lost, the DDR memory bank is widely applied to the interior of a camera and used for caching some image data and file information, but the DDR memory bank has the condition of complete data loss when power is lost, and in order to improve the safety and the integrity of data, high-end camera products in the industry all support the power-fail protection function.
At present, a power-down protection scheme of a UPS/false sh is mainly adopted in the industry, that is, when a system power supply is abnormally powered down, a UPS is used as a standby power supply to provide power-down protection for the whole camera, but a camera system cannot sense the specific state of the UPS, for example, whether the UPS exists or not, the remaining power maintaining time of the UPS and the like, so that the reliability of the power-down protection of the camera is low, another scheme is to provide protection for the camera system by using an NVDIMM, a FLASH storage medium, a DRAM chip and a large capacitor with the same capacity are arranged in a DIMM strip, after the system is powered down, the NVDIMM writes data on the DRAM into the FLASH medium by using the power stored by the large capacitor, and due to the integration of the large capacitor and the FLASH storage medium, the NVDIMM is expensive and large in size, and is.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a power-off protection system for preventing data loss when a camera is powered off, which comprises a first power module for providing working voltage for each module of the whole camera, a second power module started when the first power module is powered off, and an important data storage module;
the first power supply module is connected with the important data storage module through a first connecting circuit and used for providing working voltage for the important data storage module when the camera is not powered down;
the first power supply module is connected with the second power supply module through a second connecting circuit and used for charging the second power supply module when the camera is not powered down;
the second power supply module is connected with the important data storage module through a third connecting circuit, the third connecting circuit is controlled to be in a non-conducting state by the first power supply module when the first power supply module is powered on, and the second power supply module automatically discharges to enable the third connecting circuit to be in a conducting state to provide working voltage for the important data storage module when the first power supply module is powered off.
As a further optimization of the above scheme, the third connection circuit includes a third MOS transistor switch, and the third MOS transistor switch is a P-channel enhancement MOS transistor, a gate of the third MOS transistor switch is connected to the first power module, a source is connected to the second power module, and a drain is connected to the important data storage module, so that a gate voltage of the third MOS transistor switch is equal to a source voltage when the first power module is powered on and is in a cut-off state, and a gate voltage of the third MOS transistor switch is lower than a drain voltage when the first power module is powered off and is in a conduction state.
As a further optimization of the above scheme, the first connection circuit and the second connection circuit respectively include a first MOS transistor switch and a second MOS transistor switch of P-channel enhancement type.
As a further optimization of the above solution, the first power supply module comprises a CPU module and a charging management chip of the camera system,
the input interface of the first power supply module is connected with an external camera working power supply, and is simultaneously connected with a source electrode of a first MOS tube switch, a source electrode of a second MOS tube switch, a CPU module and a charging management chip, the CPU module is connected with a fourth pin of the charging management chip and is used for providing a control signal for the charging management chip, the charging management chip is correspondingly connected with grid electrodes of the first MOS tube switch, the second MOS tube switch and the third MOS tube switch through a first pin, a second pin and a third pin respectively, and a drain electrode of the first MOS tube switch is connected with an important data storage module and a drain electrode of the second MOS tube switch is connected with the second power supply module.
As a further optimization of the above scheme, the CPU module is connected to the fourth pin of the charging management chip and configured to provide a control signal for the charging management chip, specifically:
when the first power supply module is powered on:
controlling the high level of the third pin to cut off the switch of the third MOS tube, and simultaneously:
when the camera works, the first pin is controlled to be at a low level and the second pin is controlled to be at a high level, so that the first connecting circuit is conducted and the second connecting circuit is disconnected, and the second power supply module is in an uncharged state;
when the camera is in standby, the high level of the first pin is controlled and the low level of the second pin is controlled, so that the first connecting circuit is disconnected and the second connecting circuit is connected, and the second power supply module is in a charging state.
As a further optimization of the above scheme, the input interface of the first power supply module is connected with an overvoltage protection module before being connected with an external camera working power supply, so as to prevent the internal components of the camera from being damaged due to overhigh external camera working power supply and overlarge ripple waves.
As a further optimization of the above scheme, the important data module includes an important data storage unit and a voltage stabilizing and reducing circuit unit, an input end of the voltage stabilizing and reducing circuit unit is connected to drain electrodes of the first MOS transistor switch and the third MOS transistor switch, respectively, and an output end of the voltage stabilizing and reducing circuit unit is connected to the important data storage unit.
As a further optimization of the above scheme, the important data storage unit is a DDR memory bank.
As a further optimization of the above scheme, the CPU module is connected to the charging management chip through a protection module interface, and the important data storage unit is connected to the output end of the voltage stabilizing and reducing circuit unit through a protection module interface.
As a further optimization of the above scheme, the voltage stabilizing and dropping circuit unit includes a first voltage stabilizing and dropping circuit unit and a second voltage stabilizing and dropping circuit unit, the first voltage stabilizing and dropping circuit unit is configured to drop the voltage received by the input terminal of the voltage stabilizing and dropping circuit unit to a stable 5V voltage, and the second voltage stabilizing and dropping circuit unit is configured to drop the stable 5V voltage to a DDR memory bank operating voltage.
The power-off protection system for preventing data loss when the camera is powered off has the following beneficial effects:
1. in the invention, the first power supply module is connected with the second power supply module through the second connecting circuit, the second power supply module is connected with the important data storage module through the third connecting circuit and charges the second power supply module when the first power supply module is electrified, when the first power supply module is powered off, the second power supply module supplies power to important data storage units such as DDR memory banks and the like, thereby not only realizing that the DDR memory banks and the like in the camera still keep not powered off after the system power supply is abnormally powered off, therefore, the purpose of ensuring that the internal data of the important data storage module is not lost is achieved, the important data are transferred to the nonvolatile memory device without adding the nonvolatile memory device for power failure, the power supply for the DDR memory bank is realized when the camera is abnormally powered off, the large electric quantity required by the power supply for the whole camera after the power failure is avoided, and the used battery volume is smaller.
In the invention, the second power supply module is charged when the first power supply module is powered on, the second power supply module can release electric energy when the first power supply module is powered off, and the third connecting circuit is automatically conducted based on the electric energy released by the second power supply module to provide working voltage for the DDR memory bank, so that when the first power supply module is powered off, the second power supply module is switched to without an additional switching control signal or switching control system, and therefore, no additional power supply circuit is needed to drive the control signal or the control system.
3. According to the invention, by utilizing the conduction and cut-off characteristics of the P-channel enhanced MOS tube, the grid voltage is controlled when the first power supply module is powered on, so that the first power supply module is in a cut-off state, when the first power supply module is powered off, the grid loses the voltage provided by the first power supply module, the conduction of the first power supply module is controlled by the second power supply module, the automatic power supply switching function is realized, the circuit design is simpler, an external battery is conveniently installed in a camera, the occupied internal space of the camera is small, and the volume and the weight of the camera are small.
Drawings
FIG. 1 is a block diagram of the entire power-off protection system for preventing data loss when a camera is powered down in accordance with the present invention;
FIG. 2 is a connection block diagram of a specific circuit module of a power-off protection system for preventing data loss when a camera is powered off according to the present invention;
FIG. 3 is a block diagram of the circuit block connections of the optimization scheme of FIG. 2;
fig. 4 is a schematic circuit diagram of a power-off protection system for preventing data loss when a camera is powered down according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a power-off protection system for preventing data loss when a camera is powered down, including a first power module for providing a working voltage for each module of the whole camera, a second power module activated when the first power module is powered down, and an important data storage module, in this embodiment, the important data storage module includes an important data storage unit and a voltage stabilizing and reducing circuit unit, where the important data storage unit takes a DDR memory bank as an example for description.
The first power supply module is connected with the important data storage module through a first connecting circuit and used for providing working voltage for the important data storage module when the camera is not powered down;
the first power supply module is connected with the second power supply module through a second connecting circuit and used for charging the second power supply module when the camera is not powered down;
the second power supply module is connected with the important data storage module through a third connecting circuit, when the first power supply module is electrified, the third connecting circuit is controlled to be in a non-conducting state by the first power supply module, and when the first power supply module is powered off, the second power supply module automatically discharges to enable the third connecting circuit to be in a conducting state to provide working voltage for the important data storage module.
In the embodiment of the invention, the working voltage provided by the first power supply module is a system power supply for providing the working voltage for the whole camera when the camera is not powered down;
when the system power supply normally supplies power to the camera, the camera is driven to work only by the first power supply module, and the second power supply module does not serve as a power supply to supply working voltage; when the system power supply is powered off, namely the first power supply module can not provide working voltage, the second power supply module is only used for driving work and the important data storage module is only used for working, and the automatic management function of the power supply path is realized.
On one hand, the embodiment of the invention only supplies power to the important data storage module when the camera is abnormally powered down, so that the important data storage module (important storage media such as DDR memory banks and the like) in the camera still keeps not powered down after the system power supply is abnormally powered down, thereby achieving the purpose of ensuring that the internal data of the important data storage module is not lost, and a nonvolatile memory device is not required to be added for transferring the important data to the nonvolatile memory device after the power down, and the electric energy is not required to be supplied to the whole camera.
On the other hand, when the first power supply module is powered off, the embodiment of the invention does not need to switch to the second power supply module by an additional switching control signal or an additional switching control system, so that an additional power supply circuit driving control signal or an additional switching control system is not needed.
Compared with the prior art that the external UPS is used for supplying power to the whole camera after the abnormal power failure of the camera or the small-capacity battery is used for supplying power to the system after the power failure of the camera, the CPU is enabled to transmit the data cached in the DDR memory bank to the FLASH medium after detecting the power supply condition so as to ensure that the data is not lost when the power failure occurs, the technical scheme of the embodiment of the invention can realize simpler circuit design, simpler and more convenient system working flow, smaller volume of the battery used externally, the external battery can be installed in the camera, less space is occupied in the camera, and the volume and weight of the camera are reduced.
Specifically, referring to fig. 2, the first power module includes a CPU module and a charge management chip of the camera system, the third connection circuit includes a third MOS transistor switch, the third MOS transistor switch is a P-channel enhancement MOS transistor, a gate of the third MOS transistor switch is connected to the first power module, a drain is connected to the second power module, and a source is connected to the important data storage module, so that a gate voltage of the third MOS transistor switch is equal to a source voltage when the first power module is powered on and is in a cut-off state, and a gate voltage of the third MOS transistor switch is smaller than a drain voltage when the first power module is powered off and is in a conduction state;
the first connecting circuit and the second connecting circuit respectively comprise a P-channel enhanced first MOS tube switch and a second MOS tube switch;
the input interface of the first power supply module is connected with an external camera working power supply and is simultaneously connected with a source electrode of the first MOS tube switch, a source electrode of the second MOS tube switch, the CPU module and the charging management chip;
the charging management chip is correspondingly connected with the grids of the first MOS tube switch, the second MOS tube switch and the third MOS tube switch through a first pin, a second pin and a third pin respectively, and the drain electrode of the first MOS tube switch is connected with the important data storage module and the drain electrode of the second MOS tube switch is connected with the second power supply module;
the CPU module is connected with a fourth pin of the charging management chip and used for providing control signals for the charging management chip, namely providing high and low level control signals for the first pin, the second pin and the third pin of the charging management chip so as to realize the on and off of the first MOS tube switch, the second MOS tube switch and the third MOS tube switch.
Specifically, when the first power module is powered on:
controlling the high level of the third pin to cut off the switch of the third MOS tube, and simultaneously:
when the camera works, the first pin is controlled to be at a low level and the second pin is controlled to be at a high level, so that the first connecting circuit is conducted and the second connecting circuit is disconnected, and the second power supply module is in an uncharged state;
when the camera is in standby, the high level of the first pin is controlled and the low level of the second pin is controlled, so that the first connecting circuit is disconnected and the second connecting circuit is connected, and the second power supply module is in a charging state.
That is to say the camera normal during operation, control first power module and do not charge for second power module, thereby reduce the during operation and charge the battery and bring great ripple to the system power, during the camera standby, when the memory bank was out of work, just can control first power module and charge for second power module, improved the safety in utilization performance of battery.
When the first power supply module is powered on: and controlling the high level of the third pin to cut off the switch of the third MOS transistor, so that the second power supply module cannot supply power to the memory bank, the first power supply module is higher in priority than the second power supply module, and the first power supply module is preferentially selected when the memory bank is supplied with power.
Further, referring to fig. 4, in the present embodiment, the external camera operating power supply is VCC _ SYS _ 12V; the second power module is a battery power VABT.
The charging management chip adopts a BQ24703PWR chip, a fourth pin is an ENABLE pin ENABLE of an 8 th pin, a first pin, a second pin and a third pin are respectively a pin 24, a pin 21 and a pin 23 of the BQ24703PWR chip, and a first MOS tube switch, a second MOS tube switch and a third MOS tube switch adopt P-channel MOS tubes SI4435DY and are respectively U13, U14 and U15;
when the external camera working power supply normally works, namely the first power supply module is electrified:
CPU normal work can send control signal to the management chip that charges, and based on the characteristic of P channel enhancement mode MOS pipe, at camera during operation:
controlling high level of pins 23 and 21 and low level of pin 24 to realize that only the first MOS tube switch is conducted, and the external camera working power supply supplies power to the memory bank, while the second power supply module does not charge;
when the camera is in standby:
controlling the high level of pins 23 and 24 and the low level of pin 21 to realize that only the second MOS tube switch is conducted, and stopping the external camera working power supply to supply power to the memory bank and charge the second power supply module;
when the working power supply of the external camera is abnormally powered down, namely the first power supply module is powered off:
the CPU is in a non-working state, at the moment, the whole circuit comprises a second power supply module, a third MOS tube switch and an important data storage module, the second power supply module discharges electricity, the third MOS tube switch is conducted under the action of the second power supply module, and the second power supply module supplies power for the important data storage module.
Referring to fig. 3, in order to optimize the whole circuit structure, an overvoltage protection module and a protection module interface are added in the whole circuit structure, specifically:
the input interface of first power module connects overvoltage protection module before connecting outside camera working power for prevent that outside camera working power is too high and the ripple is too big to damage camera internal components and parts, overvoltage protection module adopts overvoltage protection chip MAX15091A in this embodiment, and wherein, battery protection board and battery individual difference can arouse that the initial voltage scope of low pressure protection outage is 5.5V-6V.
The CPU module is connected with the charging management chip through a protection module interface, sends a control signal to the fourth pin of the charging management chip, and the important data storage unit is connected with the output end of the voltage stabilizing and reducing circuit unit through the protection module interface.
The important data module comprises an important data storage unit and a voltage stabilizing and reducing circuit unit, wherein the input end of the voltage stabilizing and reducing circuit unit is respectively connected with the drain electrode of the first MOS tube switch and the source electrode of the third MOS tube switch, and the output end of the voltage stabilizing and reducing circuit unit is connected with the important data storage unit (namely a DDR memory bank).
The voltage stabilizing and reducing circuit unit comprises a first voltage stabilizing and reducing circuit unit and a second voltage stabilizing and reducing circuit unit, the first voltage stabilizing and reducing circuit unit is used for reducing the voltage received by the input end of the voltage stabilizing and reducing circuit unit into stable 5V voltage, and the second voltage stabilizing and reducing circuit unit is used for reducing the stable 5V voltage into DDR memory bank working voltage.
Specifically, the first voltage stabilizing and dropping circuit unit includes, but is not limited to, a BUCK/BOOST type IC, a DC/DC modulation IC, and a linear modulation IC, and its main functions are: when the DDR memory bank supplies power to a first power supply module, namely a system power supply VCC _ SYS _12V, reducing the system power supply 12V to 5V to supply power to a rear-stage power supply management chip; when the DDR memory bank supplies power to the second power module, namely the VBAT power supply of the battery pack, the output of the battery pack is not linear output, so that the voltage higher than 5V needs to be reduced to 5V, and the voltage lower than 5V needs to be increased to 5V to supply power to the rear-stage power management chip. The output end of the first voltage stabilizing and reducing circuit unit is connected to the interface of the protection module.
The second voltage stabilizing and reducing circuit unit connected with the output end of the first voltage stabilizing and reducing circuit unit comprises but not limited to a DC/DC modulation IC and a linear modulation IC. The function of the power supply is to provide a direct power supply for the DDR memory bank. For example, the DDR3 memory bank power management chip converts the input 5V into 0.75V/1.5V/3.3V, and the DDR4 memory bank power management chip converts the input 5V into 0.6V/1.2V/2.5V.
The present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make various modifications without creative efforts from the above-described conception, and fall within the scope of the present invention.
Claims (10)
1. The utility model provides a power protection system that prevents data loss when camera falls power supply, its characterized in that: the camera comprises a first power module for providing working voltage for each module of the whole camera, a second power module started when the first power module is powered off, and an important data storage module;
the first power supply module is connected with the important data storage module through a first connecting circuit and used for providing working voltage for the important data storage module when the camera is not powered down;
the first power supply module is connected with the second power supply module through a second connecting circuit and used for charging the second power supply module when the camera is not powered down;
the second power supply module is connected with the important data storage module through a third connecting circuit, the third connecting circuit is controlled to be in a non-conducting state by the first power supply module when the first power supply module is powered on, and the second power supply module automatically discharges to enable the third connecting circuit to be in a conducting state to provide working voltage for the important data storage module when the first power supply module is powered off.
2. A power-off protection system for preventing data loss when a camera is powered down according to claim 1, characterized in that: the third connecting circuit comprises a third MOS tube switch which is a P-channel enhancement type MOS tube, the grid electrode of the third MOS tube switch is connected with the first power supply module, the source electrode of the third MOS tube switch is connected with the second power supply module, and the drain electrode of the third MOS tube switch is connected with the important data storage module, so that the grid voltage of the third MOS tube switch is equal to the source voltage and is in a cut-off state when the first power supply module is electrified, and the grid voltage of the third MOS tube switch is smaller than the drain voltage and is in a conducting state when the first power supply module is powered down.
3. A power-off protection system for preventing data loss when a camera is powered down according to claim 2, characterized in that: the first connecting circuit and the second connecting circuit respectively comprise a P-channel enhanced first MOS tube switch and a P-channel enhanced second MOS tube switch.
4. A power-off protection system for preventing data loss when a camera is powered down according to claim 3, characterized in that: the first power supply module comprises a CPU module and a charging management chip of the camera system,
the input interface of the first power supply module is connected with an external camera working power supply, and is simultaneously connected with a source electrode of a first MOS tube switch, a source electrode of a second MOS tube switch, a CPU module and a charging management chip, the CPU module is connected with a fourth pin of the charging management chip and is used for providing a control signal for the charging management chip, the charging management chip is correspondingly connected with grid electrodes of the first MOS tube switch, the second MOS tube switch and the third MOS tube switch through a first pin, a second pin and a third pin respectively, and a drain electrode of the first MOS tube switch is connected with an important data storage module and a drain electrode of the second MOS tube switch is connected with the second power supply module.
5. A power-off protection system for preventing data loss when a camera is powered down according to claim 4, characterized in that: the CPU module is connected with a fourth pin of the charging management chip and used for providing a control signal for the charging management chip, and the CPU module specifically comprises:
when the first power supply module is powered on:
controlling the high level of the third pin to cut off the switch of the third MOS tube, and simultaneously:
when the camera works, the first pin is controlled to be at a low level and the second pin is controlled to be at a high level, so that the first connecting circuit is conducted and the second connecting circuit is disconnected, and the second power supply module is in an uncharged state;
when the camera is in standby, the high level of the first pin is controlled and the low level of the second pin is controlled, so that the first connecting circuit is disconnected and the second connecting circuit is connected, and the second power supply module is in a charging state.
6. A power-off protection system for preventing data loss when a camera is powered down according to claim 4, characterized in that: the input interface of the first power supply module is connected with an overvoltage protection module before being connected with an external camera working power supply, and the overvoltage protection module is used for preventing the internal components of the camera from being damaged due to overhigh external camera working power supply and overlarge ripple waves.
7. A power-off protection system for preventing data loss when a camera is powered down according to claim 4, characterized in that: the important data module comprises an important data storage unit and a voltage stabilizing and reducing circuit unit, wherein the input end of the voltage stabilizing and reducing circuit unit is respectively connected with the drain electrodes of the first MOS tube switch and the third MOS tube switch, and the output end of the voltage stabilizing and reducing circuit unit is connected with the important data storage unit.
8. A power-off protection system for preventing data loss when a camera is powered down according to claim 7, wherein: the important data storage unit is a DDR memory bank.
9. A power-off protection system for preventing data loss when a camera is powered down according to claim 8, wherein: the CPU module is connected with the charging management chip through a protection module interface, and the important data storage unit is connected with the output end of the voltage stabilizing and reducing circuit unit through a protection module interface.
10. A power-off protection system for preventing data loss when a camera is powered down according to claim 9, wherein: the voltage stabilizing and reducing circuit unit comprises a first voltage stabilizing and reducing circuit unit and a second voltage stabilizing and reducing circuit unit, the first voltage stabilizing and reducing circuit unit is used for reducing the voltage received by the input end of the voltage stabilizing and reducing circuit unit into stable 5V voltage, and the second voltage stabilizing and reducing circuit unit is used for reducing the stable 5V voltage into DDR memory bank working voltage.
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| CN212486629U (en) * | 2020-08-19 | 2021-02-05 | 合肥富煌君达高科信息技术有限公司 | Power-off protection system for preventing data loss when camera power failure |
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