CN217606557U - Power-down protection circuit of storage device - Google Patents
Power-down protection circuit of storage device Download PDFInfo
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- CN217606557U CN217606557U CN202221436660.0U CN202221436660U CN217606557U CN 217606557 U CN217606557 U CN 217606557U CN 202221436660 U CN202221436660 U CN 202221436660U CN 217606557 U CN217606557 U CN 217606557U
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Abstract
The utility model discloses a storage device power-down protection circuit, including stand-by power supply module, stand-by power supply charge-discharge management module and stand-by power supply detection module, stand-by power supply module and stand-by power supply detection module connect, stand-by power supply detection module and stand-by power supply charge-discharge management module's charge control end are connected, stand-by power supply module and main power supply are connected and are formed the passageway that charges in advance, stand-by power supply module, stand-by power supply charge-discharge management module and main power supply connect gradually and form the passageway that discharges, stand-by power supply module, stand-by power supply charge-discharge management module and storage device connect gradually. The utility model has the characteristics of the integrated level is high, small, stand-by power supply voltage stability is high, can satisfy the power down protection function requirement of low temperature scene and low-power consumption scene.
Description
Technical Field
The utility model relates to a computer storage field especially relates to a storage device power-down protection circuit.
Background
The non-volatile memories such as EMMC, flash and the like are widely applied to various embedded systems at present and serve as important carriers for storing data. In the process of writing data in the EMMC and the Flash, if abnormal power failure occurs suddenly, the problems of data loss, data writing errors and the like can be caused, and the stored data is abnormal.
In general, memories such as an EMMC and a Flash have a power-down protection function, but the power-down protection cannot protect all power-down situations, so in the design of a storage device, a power-down protection circuit of hardware needs to be added to enhance the reliability of a storage carrier.
The power failure protection circuit of the hardware is provided with the standby power supply, and when a main power supply is powered down, the standby power supply is started to supply power to the electric equipment, so that the electric equipment can be normally closed and cannot be damaged due to sudden power failure.
Patent CN202013570U discloses a solid state disk power-down protection device based on PCIE interface, and the device includes a power supply monitoring module and a power supply switching module. The power supply switching module is used for receiving control information of the power supply monitoring module, and switching a power supply path of the main power supply, the built-in static power supply, the external standby power supply and the solid state disk according to the working state of the main power supply, so that frequent charging and discharging of the standby power supply are avoided, electric energy is saved, and the service life of the standby power supply is protected. The external standby power supply adopts a super capacitor for energy storage, and the super capacitor is connected with a lithium battery in parallel for charging. In the practical application process, the working environment of the lithium battery is generally required to be over 0 ℃, and the lithium battery is used for charging the standby power supply, so that the power failure protection circuit has great limitation in use, and the use requirement of industrial application in a low-temperature environment cannot be met. Meanwhile, a plurality of discrete devices are used, the circuit integration level is low, the size is large, and the use is inconvenient. In addition, when a super capacitor is used as a backup power supply, the voltage of the super capacitor is likely to fluctuate greatly due to charging and discharging, and the backup power supply voltage may be unstable.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in: technical problem to prior art exists, the utility model provides a storage equipment power fail safeguard circuit has the characteristics that the integrated level is high, small, stand-by power supply voltage stability is high, can satisfy the power fail safeguard function requirement of low temperature scene and low-power consumption scene.
In order to solve the technical problem, the utility model provides a technical scheme does:
the utility model provides a storage equipment power-fail protection circuit, includes stand-by power supply module, stand-by power supply charge-discharge management module and stand-by power supply detection module, stand-by power supply module and stand-by power supply detection module connect, stand-by power supply detection module and stand-by power supply charge-discharge management module's charge control end are connected, and main power supply, stand-by power supply charge-discharge management module and stand-by power supply module connect gradually and form the passageway that charges, stand-by power supply module, stand-by power supply charge-discharge management module and storage equipment's feeder ear connect gradually and form the passageway that discharges.
Further, the main power supply and the standby power supply module are connected to form a pre-charging channel, the standby power supply charging and discharging management module comprises a charging and discharging management chip, the standby power supply module is connected with a first port and an enabling end of the charging and discharging management chip, a charging control port of the charging and discharging management chip is connected with the standby power supply detection module, and a second port of the charging and discharging management chip is connected with the main power supply and a power supply end of the storage device respectively.
Furthermore, a current limiting module is arranged on the pre-charging channel, and the main power supply is connected with the standby power supply module through the current limiting module.
Furthermore, the current-limiting module comprises a current-limiting resistor and a diode, and the main power supply, the current-limiting resistor R4, the diode D1 and the standby power supply module are sequentially connected in series.
Furthermore, a reverse blocking module is arranged on the charging channel, the main power supply is connected with the power supply end of the storage device through the reverse blocking module, and the main power supply is connected with the standby power supply charging and discharging management module through the reverse blocking module.
Further, the reverse blocking module comprises a power switch chip or a diode or a MOS transistor.
The power failure information acquisition device further comprises a main power supply detection module, wherein the main power supply is connected with the main power supply detection module, and the main power supply detection module is connected with the power failure information acquisition end of the storage device.
Furthermore, the main power supply detection module comprises a first comparator, the main power supply is connected with the negative input end of the first comparator, the positive input end of the first comparator is connected with the built-in reference voltage end of the first comparator, and the output end of the first comparator is connected with the power failure information acquisition end of the storage device.
Furthermore, the standby power supply detection module comprises a second comparator, the standby power supply module is connected with the negative input end of the second comparator, the positive input end of the second comparator is connected with the built-in reference voltage end of the second comparator, and the output end of the second comparator is connected with the charging control end of the standby power supply charging and discharging management module.
Further, the standby power supply module comprises a super capacitor.
Compared with the prior art, the utility model has the advantages of:
1. the utility model comprises a standby power supply module, a main power supply detection module and a standby power supply detection module, wherein a reverse blocking module, a pre-charging module and a standby power supply charging and discharging management module are arranged between the main power supply, the standby power supply and the storage device, the circuit integration level is high, and the size is small;
2. the utility model can charge the standby power supply module through the main power supply without other power supplies such as an additional lithium battery and the like, thereby meeting the use requirement of a low-temperature scene and simplifying the circuit structure;
3. the standby power supply module directly supplies power to the storage equipment through the standby power supply charge-discharge management module without using reverse blocking devices such as diodes, and the standby power supply module has high use efficiency and can meet the use requirement of a low-power scene;
4. the utility model discloses a stand-by power supply charge-discharge management module makes stand-by power supply module's voltage remain stable.
Drawings
Fig. 1 is a block diagram of the embodiment of the present invention.
Fig. 2 is a detailed circuit diagram of an embodiment of the present invention.
Fig. 3 is a circuit diagram of a main power detection module according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of the standby power detection module according to an embodiment of the present invention.
Illustration of the drawings: the device comprises a 1-standby power supply module, a 2-standby power supply charging and discharging management module, a 3-standby power supply detection module, a 4-current limiting module, a 5-reverse blocking module and a 6-main power supply detection module.
Detailed Description
The invention will be further described with reference to the drawings and specific preferred embodiments without limiting the scope of the invention.
As shown in fig. 1, this embodiment provides a power down protection circuit for storage device, including stand-by power supply module 1, stand-by power supply charge and discharge management module 2 and stand-by power supply detection module 3, stand-by power supply module 1 and stand-by power supply detection module 3 are connected, stand-by power supply detection module 3 and stand-by power supply charge and discharge management module 2's charge control end is connected, main power supply and stand-by power supply module 1 are connected and are formed the passageway of charging in advance, the main power supply, stand-by power supply charge and discharge management module 2 and stand-by power supply module 1 connect gradually and form the passageway of discharging, storage device includes the processor circuit, memory device EMMC or Flash and other functional circuits etc., wherein:
the standby power supply module 1 is used for supplying power to the storage equipment through the standby power supply charging and discharging management module 2 when a main power supply is powered off, and is also used for pre-charging the main power supply when the main power supply is normal, and then charging the main power supply through the standby power supply charging and discharging management module 2 after a certain electric quantity is reached;
the standby power supply charging and discharging management module 2 is used for balancing the voltage of the standby power supply module 1 when the standby power supply module 1 is charged and also used for performing voltage conversion when the standby power supply module 1 is discharged;
the standby power supply detection module 3 is used for detecting the voltage of the standby power supply module 1, and when the voltage of the standby power supply module 1 reaches the upper limit cut-off voltage and the lower limit cut-off voltage of charging, charging stop signals and charging enable signals are respectively generated and sent to the standby power supply charging and discharging management module 2.
Through the structure, in the power-down protection circuit of the storage device, the standby power module 1 is charged by a main power supply, other charging power supplies such as a lithium battery are omitted, and meanwhile, the standby power supply charging and discharging management module 2 is adopted, so that the voltage in the charging process of the standby power module 1 is kept stable, and a reverse blocking device on a discharging channel is omitted, therefore, the power-down protection circuit of the storage device simplifies the circuit structure, improves the use efficiency of the standby power module 1, and keeps the voltage stable in the charging and discharging process of the standby power module 1.
As shown in fig. 1, in order to avoid damage to the standby power module 1 caused by excessive current output from the main power source to the pre-charging channel, the pre-charging channel is provided with a current-limiting module 4, and the main power source is connected to the standby power module 1 through the current-limiting module 4. As shown in fig. 2, the current limiting module 4 includes a current limiting resistor R4, and in order to prevent current from being reversely connected from the standby power module 1 to the main power, the current limiting module 4 further includes a diode D1, and the main power, the current limiting resistor R4, the diode D1 and the standby power module 1 are sequentially connected in series, so as to limit the current of the pre-charging channel and block the reverse current of the pre-charging channel.
As shown in fig. 1, in order to avoid that a reverse current on the charging channel damages the main power supply, a reverse blocking module 5 is disposed on the charging channel in this embodiment, the main power supply is connected to a power supply terminal of the storage device through the reverse blocking module 5, and the main power supply is further connected to the standby power supply charging and discharging management module 2 through the reverse blocking module 5. The reverse blocking module 5 may be a power switch chip with a reverse blocking function, may also be a diode, and may also be a circuit with a reverse blocking function composed of MOS transistors.
In this embodiment, the reverse blocking module 5 is a power switch chip U2 with a model number of TPS25940ARVC, which can provide reverse blocking when the output voltage is greater than the input voltage, as shown in fig. 2, in the power switch chip U2, the input terminal pin (pin No. 4) and the enable terminal pin (pin No. 5) are respectively connected to the main power supply, the output terminal pin (pin No. 1) is connected to the power supply terminal of the storage device and the standby power supply charging and discharging management module 2, the ground terminal pin (pin No. 2) is grounded, other pins are idle, meanwhile, the pin No. 4 and the pin No. 5 are also grounded through a capacitor C1, the pin No. 1 is also grounded through a capacitor C2, and the function of blocking the reverse current on the charging channel is realized through the above connection structure.
As shown in fig. 1, in order that the storage device can obtain the main power failure information in time and perform corresponding processing, the power failure protection circuit for the storage device of this embodiment further includes a main power detection module 6, where the main power detection module 6 is configured to detect a voltage of a main power, and when the voltage of the main power is lower than a low voltage set value, a power failure alarm signal is generated and input to the storage device, an output end of the main power is connected to an input end of the main power detection module 6, and an output end of the main power detection module 6 is connected to a power failure information acquisition end of the storage device.
As shown in fig. 3, the main power detection module 6 in this embodiment includes a first comparator U1 with a type TLV3012aid bvr, the main power is connected to a negative input terminal (pin No. 4) of the first comparator U1 through a resistor R1, in the first comparator U1, a positive input terminal (pin No. 3) is connected to a built-in reference voltage terminal (pin No. 5), an output terminal (pin No. 1) is connected to an information acquisition terminal of the storage device, a positive power source terminal (pin No. 6) is connected to a power VCC, a negative power source terminal (pin No. 2) is grounded, and in addition, the resistor R1 is grounded through a resistor R2.
The input and output logic of the first comparator U1 is: and if the voltage of the positive input end is greater than that of the negative input end, outputting a high level, otherwise, outputting a low level.
Through the connection relation, if the voltage of the main power supply is V, the voltage between R1 and R2 is V x R2/(R1 + R2);
if the built-in reference voltage of the first comparator U1 is VREF, when V R2/(R1 + R2) is greater than VREF, the first comparator outputs low level to the U1 storage device; when V R2/(R1 + R2) is not more than VREF, the first comparator U1 outputs a high level to the storage device to serve as a power-off alarm signal, when a power-off information acquisition end of the storage device receives the high level, the power-off information acquisition end indicates that the main power supply has power-off and is using the standby power supply module 1 to supply power, at the moment, the storage device needs to store information of the current state in time, and stops continuously writing data after the storage is finished, so that the storage device is prevented from storing data abnormally due to power-off of the main power supply.
As shown in fig. 4, the standby power detection module 3 of this embodiment includes a second comparator U4 with a model TLV3012aid bvr, the standby power module 1 is connected to a negative input terminal (pin No. 4) of the second comparator U4 through a resistor R8, in the second comparator U4, the positive input terminal (pin No. 3) is connected to a built-in reference voltage terminal (pin No. 5) through a resistor R11, the output terminal (pin No. 1) is connected to a charging control terminal of the standby power charging and discharging management module 2, the positive power terminal (pin No. 6) is connected to a reference voltage VCC, the negative power terminal (pin No. 2) is grounded, in addition, the resistor R8 is grounded through a resistor R9, and the resistor R11 is connected to a charging control terminal of the standby power charging and discharging management module 2 through a resistor R10.
The input and output logic of the second comparator U4 is: if the voltage of the positive input end is larger than that of the negative input end, a high level is output, otherwise, a low level is output.
Through the above connection relationship, if the voltage of the standby power module 1 is V1, the high level of the output end of the second comparator U4 is V2, the low level is 0, the built-in reference voltage of the second comparator U4 is VREF, where V2> VREF, then:
1. in the initial state, V1=0, the second comparator U4 outputs a high level to the charging control end of the standby power supply charging and discharging management module 2 as a charging enable signal, at this time, the voltage at the negative input end of the second comparator U4 is V1 × R9/(R8 + R9), and the voltage at the positive input end is (V2-VREF) × R11/(R10 + R11) + VREF;
2. when V1 gradually increases, so that the voltage V1 × R9/(R8 + R9) at the negative input end of the second comparator U4 is greater than the voltage (V2-VREF) × R11/(R10 + R11) + VREF at the positive input end, the second comparator U4 outputs a low level 0 as a charging stop signal to the charging control end of the standby power charging and discharging management module 2, at this time, the voltage at the negative input end of the second comparator U4 is V1 × R9/(R8 + R9), and the voltage at the positive input end is VREF × R10/(R10 + R11);
3. after the charging is stopped, the voltage V1 of the backup power module 1 is gradually decreased by discharging through R8 and R9, so that when the voltage V1 × R9/(R8 + R9) at the negative input end of the second comparator U4 is less than or equal to the voltage VREF × R10/(R10 + R11) at the positive input end, the second comparator U4 outputs the high level V2 as the charge enable signal to the charge control end of the backup power charge and discharge management module 2 again.
Under the condition that the main power supply is electrified, the voltage V1 of the standby power supply module 1 can be maintained within the upper limit and the lower limit of a charging cut-off voltage, wherein the upper limit of the charging cut-off voltage is as follows:
((V2-VREF)*R11/(R10+R11)+VREF)*(R8+R9)/R9]
the lower limit of the charge cut-off voltage is:
(VREF*R10/(R10+R11)*(R8+R9)/R9)
the stability of the standby power supply voltage can be ensured by adjusting the resistance values of R8, R9, R10 and R11.
The standby power module 1 may be a super capacitor, or a standby power supply including a super capacitor group connected in parallel and a voltage-equalizing circuit, as shown in fig. 2, the standby power module 1 of this embodiment employs a super capacitor C0, the standby power charge and discharge management module 2 includes a charge and discharge management chip U3 of the model TPS63802DLAR, and supports forward and reverse current operation, and when an input voltage approaches a set output voltage, it will automatically boost or buck, the standby power module 1 and the charge and discharge management chip U3 are connected to a first port (pin No. 10) and an enable terminal (pin No. 1) for charge output and discharge input, a charge control port (pin No. 2) of the charge and discharge management chip U3 is connected to an output terminal of a second comparator U4 in the standby power detection module 3, the charge and discharge management chip U3 is connected to a power supply terminal of a storage device (pin No. 6) for charge input and discharge output, and is connected to a main power supply through a reverse blocking module 5 and a main power supply, furthermore, in the charge and discharge management chip U3, pin No. 10 and pin No. 1 are connected to a ground through a capacitor C3 and a ground pin No. 8, and pin No. 3 and No. 6R 5 are connected to a ground resistor R5, and No. 7 are connected to a resistor R5 through a resistor R6 pin R5, and a resistor R7.
Through the connection relation, when the voltage V1 of the standby power supply module 1 is higher than the enabling voltage of the charge and discharge management chip U3, the charge and discharge management chip U3 starts to work, the charge control port of the charge and discharge management chip U3 receives a level signal output by the standby power supply detection module 3, if the level signal is high, charge management is performed, the No. 6 pin receives the voltage V of the main power supply, the voltage V is output from the No. 10 pin to charge the standby power supply module 1, if the level signal is low, charge is stopped, when the main power supply is powered off, discharge management is performed, the No. 10 pin receives the voltage V1 of the standby power supply module 1, voltage boosting or voltage reducing is performed, and after the voltage V1 is converted into the working voltage of the storage device, the working voltage is output from the No. 6 pin to the power supply end of the storage device.
The working flow of the power-down protection circuit of the storage device of the embodiment is as follows:
when the main power supply is powered on:
a1 Main power supply pre-charges the standby power supply module 1 through the current limiting module 4 and supplies power to the storage device through the reverse blocking module 5;
a2 When the voltage of the standby power supply module 1 reaches the enabling voltage of the charging and discharging management chip U3 in the standby power supply charging and discharging management module 2 by pre-charging, the charging and discharging management chip U3 starts to work normally;
a3 If the pin 2MODE of the charging and discharging management chip U3 is at a high level, the main power is input to the pin 6OUT end of the charging and discharging management chip U3 through the reverse blocking module, and is output to the standby power module 1 from the pin 10VIN end of the charging and discharging management chip U3 through the charging and discharging management chip U3;
a4 The voltage range of the standby power supply module 1 is monitored through the standby power supply detection module 3, the voltage of the standby power supply module 1 reaches the set upper limit of the charging cut-off voltage, the standby power supply detection module 3 outputs a low level to a pin 2MODE of a charging and discharging management chip U3, the charging is stopped, the standby power supply module 1 starts to discharge, the voltage of the standby power supply module 1 is lower than the set lower limit of the charging cut-off voltage, the standby power supply detection module 3 outputs a high level to a pin 2MODE of the charging and discharging management chip U3 again, the charging is started, the voltage value of the standby power supply module 1 is maintained in the upper limit and the lower limit of the charging cut-off voltage, and the charging and the discharging are carried out circularly.
When the main power supply is powered off: the voltage at the terminal of the pin 6OUT of the charging and discharging management chip U3 is synchronously powered down, the standby power supply module 1 is started, the voltage of the standby power supply module 1 is input from the pin 10VIN of the charging and discharging management chip U3, and is output from the pin 6OUT after being boosted or reduced by the charging and discharging management chip U3 to supply power to the storage device.
The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a storage equipment power-fail safeguard circuit, its characterized in that, includes stand-by power supply module (1), stand-by power supply charge-discharge management module (2) and stand-by power supply detection module (3), stand-by power supply module (1) and stand-by power supply detection module (3) are connected, the charge control end of stand-by power supply detection module (3) and stand-by power supply charge-discharge management module (2) is connected gradually, and main power supply, stand-by power supply charge-discharge management module (2) and stand-by power supply module (1) connect gradually and form the passageway that discharges, stand-by power supply module (1), stand-by power supply charge-discharge management module (2) and storage equipment's feeder ear connect gradually and form the passageway that discharges.
2. The power-down protection circuit of the storage device according to claim 1, wherein the main power supply and the backup power supply module (1) are connected to form a pre-charging channel, the backup power supply charge and discharge management module (2) includes a charge and discharge management chip, the backup power supply module (1) is connected to a first port and an enable end of the charge and discharge management chip, a charge control port of the charge and discharge management chip is connected to the backup power supply detection module (3), and a second port of the charge and discharge management chip is connected to the power supply ends of the main power supply and the storage device, respectively.
3. The power-down protection circuit for the storage device, according to claim 2, is characterized in that a current-limiting module (4) is arranged on the pre-charge channel, and the main power supply is connected with the standby power supply module (1) through the current-limiting module (4).
4. The power-down protection circuit for storage equipment according to claim 3, wherein the current-limiting module (4) comprises a current-limiting resistor and a diode, and the main power supply module, the current-limiting resistor, the diode and the standby power supply module (1) are sequentially connected in series.
5. The power-down protection circuit for the storage device according to claim 1, wherein a reverse blocking module (5) is arranged on the charging channel, the main power supply is connected with a power supply end of the storage device through the reverse blocking module (5), and the main power supply is further connected with a charging and discharging management module (2) of a standby power supply through the reverse blocking module (5).
6. The power down protection circuit of a memory device according to claim 5, wherein the reverse blocking module (5) comprises a power switch chip or a diode or a MOS transistor.
7. The power-down protection circuit for the storage device according to claim 1, further comprising a main power detection module (6), wherein the main power is connected to the main power detection module (6), and the main power detection module (6) is connected to a power-down information acquisition end of the storage device.
8. The power-down protection circuit for the storage device according to claim 7, wherein the main power detection module (6) comprises a first comparator, the main power is connected to a negative input terminal of the first comparator, a positive input terminal of the first comparator is connected to a built-in reference voltage terminal of the first comparator, and an output terminal of the first comparator is connected to a power-down information acquisition terminal of the storage device.
9. The power-down protection circuit of the storage device, according to claim 1, wherein the backup power detection module (3) includes a second comparator, the backup power module (1) is connected to a negative input terminal of the second comparator, a positive input terminal of the second comparator is connected to a built-in reference voltage terminal of the second comparator, and an output terminal of the second comparator is connected to a charging control terminal of the backup power charging and discharging management module (2).
10. The power down protection circuit for a storage device according to claim 1, wherein the backup power module (1) comprises a super capacitor.
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| CN202221436660.0U CN217606557U (en) | 2022-06-09 | 2022-06-09 | Power-down protection circuit of storage device |
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| CN202221436660.0U CN217606557U (en) | 2022-06-09 | 2022-06-09 | Power-down protection circuit of storage device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116418088A (en) * | 2023-04-17 | 2023-07-11 | 基康仪器股份有限公司 | Circuit and device applied to optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116418088A (en) * | 2023-04-17 | 2023-07-11 | 基康仪器股份有限公司 | Circuit and device applied to optical fiber |
| CN116418088B (en) * | 2023-04-17 | 2024-03-12 | 基康仪器股份有限公司 | Circuit and device applied to optical fiber |
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