CN212486629U - 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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- CN212486629U CN212486629U CN202021739913.2U CN202021739913U CN212486629U CN 212486629 U CN212486629 U CN 212486629U CN 202021739913 U CN202021739913 U CN 202021739913U CN 212486629 U CN212486629 U CN 212486629U
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Abstract
The utility model discloses a power-off protection system for preventing data loss when a camera is powered down, which comprises a first power module providing working voltage for each module of the whole camera, a second power module started when the first power module is powered down, 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 module is connected with the important data storage module through the third connecting circuit, when the first power module is powered on, the third connecting circuit is controlled to be in a non-conducting state by the first power module, when the first power module is powered off, the second power 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, the DDR memory bank and the like in the camera still keep not powered off after the system power supply is abnormally powered off, the purpose of preventing the data in the important data storage module from being lost is guaranteed, the circuit design is simple, the size of the used second power module is small, and the volume and the weight of the camera are reduced.
Description
Technical Field
The utility model relates to a data storage field, concretely relates to power-off protection system that prevents data loss when camera falls the electricity.
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.
SUMMERY OF THE UTILITY MODEL
In view of the problems existing in the prior art, the utility model provides a power-off protection system for preventing data loss when a camera is powered down, 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 down, 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 utility model discloses a power-off protection system that prevents data loss when camera falls electricity possesses following beneficial effect:
1. the utility model is connected with a second power supply module through a second connecting circuit by a first power supply module, the second power supply module is connected with an important data storage module through a third connecting circuit, and the second power supply module is charged 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.
The utility model discloses in, through charging for second power module when first power module has the electricity, when first power module falls the electricity, second power module can release the electric energy, and make the third connecting circuit automatic switch on based on the electric energy of self release, for the DDR memory bank provides operating voltage, realize when first power module falls the electricity, switch to second power module and do not need extra switching control signal or switching control system, thereby do not need extra power supply circuit drive control signal or control system.
3. The utility model discloses in, through utilizing switching on and the cut-off characteristic of P channel enhancement mode MOS pipe, realize controlling its grid voltage when first power module has the electricity, make it be in the off-state, when first power module falls the electricity, the grid loses the voltage that first power module provided, it switches on by second power module control, realize automatic power supply switching function, circuit design is simpler, be convenient for install outside battery inside the camera, it is few to occupy the camera inner space, the camera is small in size and weight.
Drawings
Fig. 1 is a block diagram of the entire power-off protection system for preventing data loss when a camera is powered off;
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;
FIG. 3 is a block diagram of the circuit block connections of the optimization scheme of FIG. 2;
fig. 4 is the circuit schematic diagram of the power-off protection system for preventing data loss when the camera is powered down.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the utility model provides a camera prevents power-off protection system that data lost when falling electricity, include for each module of whole camera provide the first power module of operating voltage, the second power module, the important data storage module that launch when first power module falls the electricity, important data storage module includes important data memory cell and steady voltage step down circuit unit in this embodiment, and wherein important data memory cell uses the DDR memory bank to explain as the example.
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 utility model, the working voltage provided by the first power module is the 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 the one hand, the embodiment of the utility model provides a only be the power supply of important data storage module when the camera falls the electricity unusually for important data storage module (important storage medium such as DDR memory bank etc.) in the camera still keeps not falling the electricity after system power supply falls the electricity unusually, thereby reach the purpose that guarantees that important data storage module internal data does not lose, need not increase nonvolatile memory device and be used for falling the electricity after with important data transfer to nonvolatile memory device, also need not provide the electric energy for whole camera.
On the other hand, the embodiment of the utility model provides a when first power module falls the electricity, switch to second power module and do not need extra switching control signal or switching control system to do not need extra power supply circuit drive control signal or control system.
Compared with the prior art, use outside UPS to power down the back at the camera exception and use the low capacity battery to supply power for the system to whole camera power supply or power down the back at the camera, let CPU detect that the data transmission of buffer memory in the DRAM after the power supply condition gives FLASH medium in DDR, data do not lose when guaranteeing to fall the electricity, the technical scheme of the embodiment can realize that circuit design is simpler, and system's work flow is more simple and convenient, and the volume of the battery of outside use is littleer, can install outside battery inside the camera, occupy the camera inner space still less, reduce camera area and weight, secondly under the battery condition that uses the same capacity, the utility model discloses a duration is longer, and the data retention time of buffer memory in the DDR DRAM is longer.
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 specific embodiments, and those skilled in the art can make various changes without creative labor from the above conception, and all the changes fall within the protection 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 storage 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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| CN111935406A (en) * | 2020-08-19 | 2020-11-13 | 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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| CN111935406A (en) * | 2020-08-19 | 2020-11-13 | 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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Address after: Fuhuang New Vision Building, No. 77 Wutaishan Road, Baohe Economic Development Zone, Hefei City, Anhui Province, 230051 Patentee after: Hefei Zhongke Junda Vision Technology Co.,Ltd. Address before: 230088 Room 107, Building 3, Tiandao 10 Software Park, Hefei High-tech Zone, Anhui Province Patentee before: HEFEI FUHUANG JUNDA HIGH-TECH INFORMATION TECHNOLOGY Co.,Ltd. |