CN212302427U - Power-down data protection circuit - Google Patents
Power-down data protection circuit Download PDFInfo
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- CN212302427U CN212302427U CN202021124893.8U CN202021124893U CN212302427U CN 212302427 U CN212302427 U CN 212302427U CN 202021124893 U CN202021124893 U CN 202021124893U CN 212302427 U CN212302427 U CN 212302427U
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- 230000036039 immunity Effects 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 2
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- 238000013500 data storage Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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Abstract
The utility model discloses a fall electric data protection circuit, include: the voltage holding circuit is used for providing a power-down protection voltage; the voltage division circuit is used for setting a power-down voltage; the voltage comparison circuit is used for providing a power-down signal; one end of the voltage division circuit is electrically connected with the voltage holding circuit, and the other end of the voltage division circuit is electrically connected with the voltage comparison circuit. The utility model discloses when external power supply voltage is less than the power-down voltage that the voltage divider circuit set for, voltage comparison circuit judges that the system takes place the unusual power-down phenomenon, and voltage comparison circuit output falls the electric signal, and the system is received and is fallen the electric signal, and the system passes through the power-down protection voltage that voltage holding circuit provided, protects in writing into storage module with data, guarantees the system and has normally fallen the reliable protection of data when falling the electricity, has simplified the structure of falling the electric data protection circuit to reduce system power-down protection cost.
Description
Technical Field
The utility model belongs to the technical field of the storage technique and specifically relates to a fall electric data protection circuit is related to.
Background
At present, when a circuit system is shut down due to abnormal power failure, the system needs to write system data into a storage module for data protection; and when the system recovers the normal power supply, the system reads the data from the storage module to recover the system.
In the related technology, a standby battery is arranged in a system, when abnormal power failure occurs in the system, the standby battery supplies power to the system, and the system is closed after data is written into a storage medium; when the system recovers normal power supply, the system reads data from the storage medium to recover the system. However, the system power-down data protection is realized through the backup battery, so that the actual cost is high and the occupied space of the system is large.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a fall electric data protection circuit can provide the power down protection voltage for the system when falling the electricity.
In a first aspect, an embodiment of the present invention provides a power down data protection circuit, including: a power supply circuit for supplying a supply voltage; the voltage holding circuit is used for providing power-down protection voltage, and one end of the voltage holding circuit is electrically connected with the power supply circuit; the voltage dividing circuit is used for setting a power-down voltage, and one end of the voltage dividing circuit is electrically connected with the other end of the voltage holding circuit; and the voltage comparison circuit outputs a power-down signal according to the power supply voltage and the power-down voltage, and one end of the voltage comparison circuit is electrically connected with the other end of the voltage division circuit.
The utility model discloses fall electric data protection circuit has following beneficial effect at least: the voltage holding circuit is used for providing power failure protection voltage, so that when abnormal power failure occurs to the system, sufficient time is provided for writing data into the storage module for storage, and data loss caused by abnormal power failure of the system is avoided. The voltage dividing circuit is used for setting the power-down voltage, the voltage comparison circuit provides a power-down signal, and the system immediately writes data into the storage module after receiving the power-down signal, so that the structure of the power-down data protection circuit is simplified, and the power-down protection cost of the system is reduced.
According to the utility model discloses a fall electric data protection circuit of other embodiments, bleeder circuit includes: a first resistor and a second resistor; the first resistor and the second resistor are connected in series; one end of the first resistor is electrically connected with the voltage holding circuit, and the other end of the first resistor is electrically connected with the voltage comparison circuit; and setting the power-down voltage by adjusting the resistance value of the first resistor and/or the second resistor.
According to the utility model discloses a fall electric data protection circuit of other embodiments, voltage holding circuit includes: one end of the first capacitor is electrically connected with the voltage division circuit, the other end of the first capacitor is grounded, and the first capacitor is used for providing power-down protection voltage; and a first output end of the rectifier bridge is electrically connected with one end of the first capacitor, and a second output end of the rectifier bridge is electrically connected with the other end of the first capacitor.
According to the utility model discloses a fall electric data protection circuit of other embodiments, voltage comparison circuit includes: a voltage comparator; and the input end of the voltage comparator is electrically connected with the voltage division circuit.
According to the utility model discloses a fall electric data protection circuit of other embodiments, fall electric data protection circuit and still include: an anti-jamming circuit; the anti-interference circuit is electrically connected with the voltage comparison circuit; the immunity circuit includes: a third resistor and a second capacitor, the third resistor and the second capacitor being connected in series.
According to the utility model discloses a fall electric data protection circuit of other embodiments, fall electric data protection circuit and still include: a surge protection circuit; the surge protection circuit is electrically connected with the voltage holding circuit; the surge protection circuit includes: the voltage dependent resistor is connected with the diode in parallel.
According to the utility model discloses a fall electric data protection circuit of other embodiments, fall electric data protection circuit and still include: the MCU module is electrically connected with the anti-interference circuit; and the storage medium is electrically connected with the MCU module.
According to the utility model discloses a fall electric data protection circuit of other embodiments, storage module includes: a non-volatile storage medium NAND FLASH.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a block diagram of an embodiment of a circuit for protecting power-down data according to the present invention;
fig. 2 is a schematic circuit diagram of the embodiment of the present invention.
Reference numerals:
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
Referring to fig. 1, in some embodiments, a power down data protection circuit includes: the voltage divider comprises a power supply circuit, a voltage holding circuit, a voltage dividing circuit and a voltage comparison circuit; one end of the voltage holding circuit is electrically connected with the power supply circuit, one end of the voltage dividing circuit is electrically connected with the other end of the voltage holding circuit, and the other end of the voltage dividing circuit is electrically connected with the voltage comparison circuit; the power supply circuit is used for providing a power supply voltage. The voltage holding circuit is used for providing power-down protection voltage, and when abnormal power-down occurs to the system, the voltage holding circuit provides power for the system, so that the system can be guaranteed to have sufficient time to write data into the storage module for data storage. The voltage dividing circuit is used for setting power-down voltage, the voltage comparison circuit outputs a power-down signal according to the power supply voltage and the power-down voltage, when the power supply voltage provided by the power supply circuit is lower than the power-down voltage set by the voltage dividing circuit, the voltage comparison circuit judges that an abnormal power-down phenomenon occurs in the system and outputs the power-down signal, the system receives the power-down signal and writes data into the storage module, system data loss caused by abnormal power-down is avoided, and data protection is achieved. Specifically, the power-down signal is an interrupt signal, when the power supply voltage provided by the power supply circuit is lower than the power-down voltage set by the voltage division circuit, the voltage comparison circuit outputs the interrupt signal to the system, and the system receives the interrupt signal and writes data into the storage module for data storage.
Referring to fig. 2, in some embodiments, the voltage divider circuit 300 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series, one end of the first resistor R1 is electrically connected to the voltage holding circuit 200, and the other end of the first resistor R1 is electrically connected to the voltage comparator circuit 400. The first resistor R1 and the second resistor R2 divide the power supply voltage provided by the power supply circuit 100, and the power-down voltage is set by adjusting the resistance of the first resistor R1 and/or the second resistor R2.
The voltage comparison circuit 400 includes a voltage comparator U1, specifically, a voltage comparator U1 having a model number XC61CN2502 MR. An input terminal of the voltage comparator U1 is electrically connected to a series node of the first resistor R1 and the second resistor R2. In a specific embodiment, the voltage dividing circuit sets the power-down voltage to 8.91V, when the power supply voltage provided by the power supply circuit 100 is less than or equal to 8.91V, the divided voltage value of the first resistor R1 and the second resistor R2 is less than 2.5V, that is, the voltage at the input terminal of the voltage comparator U1 is less than 2.5V, at this time, the voltage comparator U1 outputs an interrupt signal of low level, and the system receives the interrupt signal and writes data into the memory module for protection. When the supply voltage provided by the power circuit 100 is less than or equal to 8.91V, the voltage comparison circuit 400 keeps outputting at a low level all the time; when the power supply voltage provided by the power supply circuit 100 returns to normal power supply, the divided voltage value of the first resistor R1 and the second resistor R2 is greater than 2.5V, that is, the voltage of the input terminal of the voltage comparator U1 is greater than 2.5V, the output terminal of the voltage comparator U1 outputs high level, and the system reads data from the memory module for system recovery. It can be understood that the power-down voltage may be adaptively modified according to actual situations, and is not specifically limited in this embodiment.
Referring to fig. 2, in some embodiments, the voltage holding circuit 200 includes a first capacitor ECP1 and a rectifier bridge D1, one end of the first capacitor ECP1 is electrically connected to the first output terminal 1 of the rectifier bridge D1, and the other end of the first capacitor ECP1 is electrically connected to the second output terminal 4 of the rectifier bridge D1 and is grounded. Specifically, the first capacitor ECP1 is an electrolytic capacitor, and the model of the rectifier bridge D1 is MB 6S. The rectifier bridge D1 is used for isolating, prevents the first electric capacity ECP1 to discharge to the outside, guarantees that the electric energy that first electric capacity ECP1 stored only supplies power to the system. The first capacitor ECP1 is charged through the power supply circuit 100, when the system is abnormally powered down, the first capacitor ECP1 discharges to provide power-down protection voltage for the system, and the data storage time of the system in abnormal power-down is ensured. The minimum value of the first capacitor ECP1 can be calculated according to a formula IT ═ UC, where T is the power-on time provided by the first capacitor ECP1 for the system, I is the circuit current after the first capacitor ECP1 provides the power-down protection voltage, U is the power-down protection voltage, and C is the minimum value of the first capacitor ECP 1. In some specific embodiments, the aging of the first capacitor ECP1 is considered to cause the energy storage capacity of the first capacitor ECP1 to be reduced, and the margin of the power-down protection time is ensured. The specific capacitance value of the first capacitor ECP1 is 4 times and more than 4 times of the minimum value of the first capacitor ECP 1.
Referring to fig. 2, in some embodiments, the power down data protection circuitry further includes immunity circuitry 500. The anti-jamming circuit 500 comprises a third resistor R3 and a second capacitor C1, the third resistor R3 is connected with the second capacitor C1 in series, and the output end of the voltage comparator U1 is electrically connected with the series node of the third resistor R3 and the second capacitor C1. Specifically, the third resistor R3 is connected with a voltage of 3.3V in a pull-up manner, and the third resistor R3 and the second capacitor C1 form an RC filter to filter an abnormal power-down signal generated during power supply voltage disturbance, thereby maintaining the reliability of the system.
In some embodiments, the power down data protection circuit further includes surge protection circuit 600. Surge protection circuit 600 includes piezo VR1 and diode D2, and piezo VR1 and diode D2 are connected in parallel. Specifically, when the power down data protection circuit is subjected to overvoltage, the supply voltage provided by the power supply circuit 100 is clamped at 39V, and the voltage dependent resistor VR1 absorbs excessive current to protect the power down data protection circuit. The model of the diode D2 is SMCJ36CA, the diode D2 can provide 1500W current for rapid discharge, and the combination of the voltage dependent resistor VR1 and the diode D2 can restrain surge impact with the voltage peak value of 2KV, thereby ensuring the circuit safety.
Referring to fig. 2, in some embodiments, the power down data protection circuit further comprises an MCU block and a memory block. Specifically, one end of the storage module including the nonvolatile storage medium NAND FLASH, MCU module is electrically connected with the anti-jamming circuit, and the other end of the MCU module is electrically connected with the storage module. The storage medium NAND FLASH has the characteristic of fast erasing and writing speed, the storage medium NAND FLASH is composed of blocks, the time for erasing and writing one block of the storage medium NAND FLASH is not more than 10ms, the energy storage of the first capacitor ECP1 selected by the formula IT (UC) can ensure fast erasing and writing of the storage medium NAND FLASH during abnormal power failure, and reliable storage of data during abnormal power failure is achieved.
In some embodiments, the power circuit 100 provides a 24V supply voltage. Surge protection circuit 600 is electrically connected to power supply circuit 100, surge protection circuit 600 includes a varistor VR1 and a diode D2, and varistor VR1 and diode D2 are connected in parallel. The voltage holding circuit 200 is electrically connected to the surge protection circuit 600, the voltage holding circuit 200 includes a rectifier bridge D1 and a first capacitor ECP1, one end of the first capacitor ECP1 is electrically connected to the first output terminal 1 of the rectifier bridge D1, the other end of the first capacitor ECP1 is electrically connected to the second output terminal 4 of the rectifier bridge D1, the first input terminal 2 of the rectifier bridge D1 is electrically connected to one end of a diode D2, and the second input terminal 3 of the rectifier bridge D1 is electrically connected to the other end of a diode D2. The voltage divider circuit 300 is electrically connected to the voltage holding circuit 200, the voltage divider circuit 300 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series, one end of the first resistor R1 is electrically connected to one end of the first capacitor ECP1, and one end of the second resistor R2 is grounded. The voltage comparison circuit 400 is electrically connected to the voltage divider circuit 300, the voltage comparison circuit 400 includes a voltage comparator U1, and an input terminal of the voltage comparator U1 is electrically connected to a series node of the first resistor R1 and the second resistor R2. The immunity circuit 500 is electrically connected with the voltage comparison circuit 400, the immunity circuit 500 comprises a third resistor R3 and a second capacitor C1, the third resistor R3 is connected with the second capacitor C1 in series, and the output end of the voltage comparator U1 is electrically connected with the series node of the third resistor R3 and the second capacitor C1. The output end of the voltage comparator U1 is electrically connected with the MCU module, and the MCU module is electrically connected with the storage module FLASH. When the power supply voltage provided by the power supply circuit 100 is lower than the set power-down voltage, the voltage comparator U1 outputs a low-level interrupt signal, and the MCU module receives the interrupt signal and writes data into the storage module FLASH to protect the MCU module from power-down.
The embodiment of the utility model provides a, protect the reliability of circuit, assurance circuit to falling the electric data protection circuit through setting up surge protection circuit and anti-jamming circuit. The power-down voltage is set by setting the resistance values of the first resistor R1 and/or the second resistor R2, when the voltage provided by the external power supply is lower than the set power-down voltage, the voltage comparison circuit judges that the system has an abnormal power-down phenomenon, the first capacitor ECP1 provides power-down protection voltage, and data storage time is provided for the MCU module. When abnormal power failure occurs, the voltage comparison circuit outputs a low-level interrupt signal, and the MCU module receives the interrupt signal and writes data into the storage module for storage; when the voltage provided by the external power supply is higher than the set power-down voltage, the voltage comparison circuit outputs a high level, and the MCU module reads data from the storage module to realize system recovery. The embodiment of the utility model provides a fall electric data protection circuit realizes that the abnormal power down preserves system data when, has simplified the structure that falls electric data protection circuit to the power down protection cost of reduction system.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (8)
1. Power down data protection circuit, characterized by, includes:
a power supply circuit for supplying a supply voltage;
the voltage holding circuit is used for providing power-down protection voltage, and one end of the voltage holding circuit is electrically connected with the power supply circuit;
the voltage dividing circuit is used for setting a power-down voltage, and one end of the voltage dividing circuit is electrically connected with the other end of the voltage holding circuit;
and the voltage comparison circuit outputs a power-down signal according to the power supply voltage and the power-down voltage, and one end of the voltage comparison circuit is electrically connected with the other end of the voltage division circuit.
2. The circuit of claim 1, wherein the voltage divider circuit comprises: a first resistor and a second resistor;
the first resistor and the second resistor are connected in series;
one end of the first resistor is electrically connected with the voltage holding circuit, and the other end of the first resistor is electrically connected with the voltage comparison circuit;
and setting the power-down voltage by adjusting the resistance value of the first resistor and/or the second resistor.
3. The circuit of claim 1, wherein the voltage holding circuit comprises:
one end of the first capacitor is electrically connected with the voltage division circuit, the other end of the first capacitor is grounded, and the first capacitor is used for providing power-down protection voltage;
and a first output end of the rectifier bridge is electrically connected with one end of the first capacitor, and a second output end of the rectifier bridge is electrically connected with the other end of the first capacitor.
4. The circuit of claim 1, wherein the voltage comparison circuit comprises: a voltage comparator;
and the input end of the voltage comparator is electrically connected with the voltage division circuit.
5. The powered down data protection circuit of any of claims 1 to 4, further comprising: an anti-jamming circuit;
the anti-interference circuit is electrically connected with the voltage comparison circuit;
the immunity circuit includes: a third resistor and a second capacitor, the third resistor and the second capacitor being connected in series.
6. The powered down data protection circuit of claim 5, further comprising: a surge protection circuit;
the surge protection circuit is electrically connected with the voltage holding circuit;
the surge protection circuit includes: the voltage dependent resistor is connected with the diode in parallel.
7. The powered down data protection circuit of claim 6, further comprising:
the MCU module is electrically connected with the anti-interference circuit;
and the storage module is electrically connected with the MCU module.
8. The circuit of claim 7, wherein the memory module comprises: a non-volatile storage medium NAND FLASH.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021124893.8U CN212302427U (en) | 2020-06-17 | 2020-06-17 | Power-down data protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021124893.8U CN212302427U (en) | 2020-06-17 | 2020-06-17 | Power-down data protection circuit |
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| CN212302427U true CN212302427U (en) | 2021-01-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114064410A (en) * | 2021-11-18 | 2022-02-18 | 中国兵器装备集团自动化研究所有限公司 | A method and system for starting data recording by a main processor |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114064410A (en) * | 2021-11-18 | 2022-02-18 | 中国兵器装备集团自动化研究所有限公司 | A method and system for starting data recording by a main processor |
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