Control circuit supporting SSD power failure protection

Abstract

The invention relates to a control circuit supporting SSD power-down protection, the control circuit comprises a power-down protection unit and a step-down conversion hot backup unit, the power-down protection unit comprises a power management module and an energy storage capacitor module, the step-down conversion hot backup unit comprises a voltage detection module and a switch control module, the power management module is provided with a Vi n end and a Vout end, and the Vi n end is provided with an energy storage capacitor module. The Vi n end is used for connecting an external power supply, and the Vout end is used for supplying power to the SSD; the voltage detection module is used for detecting the voltage of the Vout end so as to output a control signal of the switch control module, and the switch control module is used for controlling the energy storage capacitor module to discharge to the Vout end. When the external power supply connected with the Vi n end suddenly loses power and the power supply management module fails and cannot control the energy storage capacitor module to reduce voltage and discharge, the switch control module controls the energy storage capacitor module to discharge to the Vout end so as to supply power to the SSD to complete data protection operation.

Description

Technical Field

[0001] The present invention relates to the technical field of SSD power-off protection, and in particular to a control circuit supporting SSD power-off protection. Background Art

[0002] With the widespread application of solid-state drives (SSDs) in data centers, enterprise storage, personal computing devices and other fields, their data security and reliability have become crucial considerations. Among them, the power loss protection (PLP) technology to deal with the risk of data loss caused by sudden power failure is particularly critical. PLP is mainly composed of power management IC and energy storage capacitors, and adopts the "boost charging, buck discharging" method to achieve power loss protection. When the external power supply is normal, the power management IC uses its internal boost converter to increase the input power supply voltage to a high voltage to charge the energy storage capacitor during the charging stage, and controls the external power supply to power the SSD disk; when the external power supply is cut off, the power management IC uses its internal buck converter to release the energy stored in the high-voltage capacitor at a lower voltage to supply the SSD to complete the data protection operation.

[0003] Given the importance of PLP for data protection, when the PLP function is abnormal, it is necessary to detect and report an alarm in time to notify maintenance engineers to intervene in advance before a sudden power failure occurs. For energy storage capacitors, it is only necessary to detect whether they are normally charged to a high voltage. However, for power management ICs, due to their complexity, it is impossible to detect all faults. There is a risk that some faults are not detected in time, and the energy storage capacitor cannot be controlled to discharge at a reduced voltage to supply the SSD to complete the data protection operation when a sudden power failure occurs. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a control circuit supporting SSD power-off protection.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A control circuit supporting SSD power-off protection comprises: a power-off protection unit and a step-down conversion hot backup unit connected to the power-off protection unit, wherein the power-off protection unit comprises a power management module and an energy storage capacitor module, wherein the step-down conversion hot backup unit comprises a voltage detection module and a switch control module, wherein the power management module is provided with a Vin terminal and a Vout terminal, wherein the Vin terminal is used to connect an external power supply, and the Vout terminal is used to supply power to the SSD; wherein the voltage detection module is used to detect the voltage of the Vout terminal to output a control signal of the switch control module, and wherein the switch control module is used to control the energy storage capacitor module to discharge to the Vout terminal.

[0007] In a specific embodiment, when the voltage detection module detects that the voltage at the Vout terminal is higher than a set value, it outputs a low-level control signal to control the switch control module to be turned off, so that the energy storage capacitor module does not discharge to the Vout terminal.

[0008] In a specific embodiment, when the voltage detection module detects that the voltage at the Vout terminal is lower than the set value, it outputs a high-level control signal to control the switch control module to open, so that the energy storage capacitor module starts to discharge to the Vout terminal.

[0009] In a specific embodiment, when the power supply of the Vin terminal is abnormal, the voltage of the Vout terminal will gradually decrease. When the voltage of the Vout terminal is lower than the set value, the switch control module is turned on, and the energy storage capacitor module is discharged to the Vout terminal to make the voltage of the Vout terminal rise above the set value. Then the switch control module is turned off, and the voltage of the Vout terminal drops below the set value again. The switch control module is turned on again, and the energy storage capacitor module starts to discharge to the Vout terminal again, and the cycle is repeated until the energy storage capacitor module is exhausted.

[0010] In a specific embodiment, the power management module includes a controller U1, two ends of which are respectively connected to the Vin terminal and the Vout terminal; the energy storage capacitor module and the switch control module are both connected to the controller U1.

[0011] In a specific embodiment, the energy storage capacitor module includes an energy storage capacitor C1 , one end of the energy storage capacitor C1 is connected to the controller U1 and the switch control module, and the other end is connected to GND.

[0012] In a specific embodiment, the voltage detection module includes a transistor T2, a resistor R2 and a resistor R3, the E pole of the transistor T2 is connected to GND, the resistor R2 and the resistor R3 are connected to the B pole of the transistor T2, the resistor R2 is also connected to the switch control module and the Vout end, the resistor R3 is also connected to GND, and the C pole of the transistor T2 is also connected to the switch control module.

[0013] In a specific embodiment, the switch control module includes a MOS tube T1, a MOS tube T3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R9 and a resistor R10, the S pole of the MOS tube T3 is connected to GND, the G pole of the MOS tube T3 is connected to the resistor R7, the D pole of the MOS tube T3 is connected to the resistor R9, the resistor R7, the resistor R10 and the C pole of the transistor T2 are all connected to the resistor R4, the D pole of the MOS tube T1 is connected to the resistor R2 and the Vout terminal, the G pole of the MOS tube T1 is connected to the resistor R5, the resistor R5 is connected to the resistor R6 and the resistor R9, and the S pole of the MOS tube T1, the resistor R4 and the resistor R6 are all connected to the controller U1 and the energy storage capacitor C1.

[0014] In a specific embodiment, the model of the controller U1 is SY72001.

[0015] In a specific embodiment, the set value is 8.4V.

[0016] Compared with the prior art, the present invention has the following beneficial effects: a step-down conversion hot backup unit is provided, the step-down conversion hot backup unit includes a voltage detection module and a switch control module, the power management module is provided with a Vin terminal and a Vout terminal, the Vin terminal is used to connect an external power supply, the Vout terminal is used to supply power to the SSD, the voltage detection module is used to detect the voltage at the Vout terminal to output a control signal of the switch control module, the switch control module is used to control the energy storage capacitor module to discharge to the Vout terminal, when the external power supply connected to the Vin terminal suddenly loses power and the power management module fails and cannot control the energy storage capacitor module to step down and discharge, the switch control module controls the energy storage capacitor module to discharge to the Vout terminal to supply power to the SSD to complete the data protection operation, thereby avoiding the loss of SSD data.

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 This is a schematic block diagram of the application scenarios of common SSDs with PLP functions.

[0020] Figure 2A schematic block diagram of a control circuit supporting SSD power-off protection provided by the present invention;

[0021] Figure 3 A schematic diagram of an application scenario of a control circuit supporting SSD power-off protection provided by the present invention;

[0022] Figure 4 The figure is a schematic diagram of the principle of the control circuit supporting SSD power-off protection of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0030] See also Figure 1, a schematic block diagram of the application scenarios of common existing SSDs with PLP functions. The SSD disk is mainly composed of three modules: SOC chip, NAND Flash particles, DDR particles, and a PLP module that supplies power to these three modules. The PLP module is mainly composed of a power management IC and an energy storage capacitor, and adopts the "boost charging, buck discharging" method to achieve power-off protection. When the external power supply is normal, the power management IC uses its internal boost converter to increase the input power supply voltage to a high voltage to charge the energy storage capacitor during the charging stage, and at the same time controls the external power supply to supply power to the SSD disk; when the external power supply is cut off, the power management IC uses its internal buck converter to release the energy stored in the high-voltage capacitor at a lower voltage to supply the SSD to complete the data protection operation. Specifically, when the Vin:12V power supply is normal, the power management IC controls the output of Vin:12V to Vout to power the SSD. When the Vin:12V power supply is abnormal, the voltage on Vout starts to drop from 12V. When the power management IC detects that the voltage on Vout is lower than 8.4V, it controls the 31V on the energy storage capacitor to drop to 8.6V and discharge it to Vout.

[0031] See also Figure 2 , Figure 2 A schematic block diagram of a control circuit supporting SSD power-off protection provided in an embodiment of the present invention includes: a power-off protection unit 10 and a buck conversion hot backup unit 20 connected to the power-off protection unit 10, wherein the power-off protection unit 10 includes a power management module 11 and an energy storage capacitor module 12, and the buck conversion hot backup unit 20 includes a voltage detection module 21 and a switch control module 22, wherein the power management module 11 is provided with a Vin terminal and a Vout terminal, wherein the Vin terminal is used to connect an external power supply, and the Vout terminal is used to power the SSD; the voltage detection module 21 is used to detect the voltage of the Vout terminal to output a control signal of the switch control module 22, and the switch control module 22 is used to control the energy storage capacitor module 12 to discharge to the Vout terminal.

[0032] Specifically, a step-down conversion hot backup unit 20 is provided, and the step-down conversion hot backup unit 20 includes a voltage detection module 21 and a switch control module 22. The power management module 11 is provided with a Vin terminal and a Vout terminal. The Vin terminal is used to connect an external power supply, and the Vout terminal is used to power the SSD. The voltage detection module 21 is used to detect the voltage of the Vout terminal to output a control signal of the switch control module 22. The switch control module 22 is used to control the energy storage capacitor module 12 to discharge to the Vout terminal. When the external power supply connected to the Vin terminal suddenly loses power and the power management module 11 fails and cannot control the energy storage capacitor module 12 to step down and discharge, the switch control module 22 controls the energy storage capacitor module 12 to discharge to the Vout terminal to supply power to the SSD to complete the data protection operation, thereby avoiding the loss of SSD data.

[0033] See also Figure 2 and Figure 3 As shown, in one embodiment, when the voltage detection module 21 detects that the voltage at the Vout terminal is higher than a set value, it outputs a low-level control signal to control the switch control module 22 to be turned off so that the energy storage capacitor module 12 does not discharge to the Vout terminal.

[0034] Specifically, the SSD disk designs a step-down conversion hot backup circuit (i.e., step-down conversion hot backup unit 20) at the back stage of the PLP energy storage capacitor. When the power management IC (i.e., the power management module 11) fails and cannot control the energy storage capacitor (i.e., the energy storage capacitor module 12) to step down and discharge, the switch control circuit (i.e., the switch control module 22) controls the energy storage capacitor to step down and discharge, and supplies power to the SSD to complete the data protection operation. In addition, the main responsibility of the voltage detection module 21 is to monitor the voltage level at the Vout end in real time, which is an important part of ensuring that the SSD can operate stably, because too high or too low voltage may cause damage to the SSD. In addition, when the voltage detection module 21 detects that the voltage at the Vout end is higher than the preset safety value, it will respond immediately. This preset value is usually set according to the working characteristics of the SSD and the power management requirements to ensure that the SSD can work within a safe voltage range. Once the voltage is detected to exceed the safety range, the voltage detection module 21 will output a low-level control signal. This signal is the basis for subsequent control actions and is used to instruct the switch control module 22 to take corresponding measures. After receiving the low-level control signal, the switch control module 22 will immediately close the discharge channel from the energy storage capacitor module 12 to the Vout terminal. This is to prevent the energy storage capacitor module 12 from continuing to discharge to the Vout terminal when the voltage is too high, thereby avoiding potential damage to the SSD. The main function of the energy storage capacitor module 12 is to store electrical energy and provide power to the SSD when needed. However, if the voltage is too high, continuing to discharge may cause damage to the SSD. Therefore, it is very important to accurately control the discharge process of the energy storage capacitor module 12 through the switch control module 22.

[0035] See also Figure 2 and Figure 3 As shown, in one embodiment, when the voltage detection module 21 detects that the voltage at the Vout terminal is lower than the set value, it outputs a high-level control signal to control the switch control module 22 to open, so that the energy storage capacitor module 12 starts to discharge to the Vout terminal.

[0036] Specifically, when the voltage at the Vout terminal is lower than the preset set value, the voltage detection module 21 will immediately identify this abnormal situation. This set value is usually determined based on the working voltage requirements of the SSD, the power management strategy, and the discharge characteristics of the energy storage capacitor module 12. Once the voltage is detected to be lower than the set value, the voltage detection module 21 will output a high-level control signal. This signal is a direct instruction for subsequent control actions and is used to instruct the switch control module 22 to open the discharge channel. After receiving the high-level control signal, the switch control module 22 will immediately open the discharge channel from the energy storage capacitor module 12 to the Vout terminal. This action enables the electrical energy stored in the energy storage capacitor module 12 to be smoothly released to the Vout terminal, providing the necessary power support for the SSD. By accurately controlling the discharge process of the energy storage capacitor module 12, this technology can ensure that when the voltage at the Vout terminal drops, the SSD can still obtain sufficient power support, which helps to maintain the stable operation of the SSD and prevent system crashes or data loss due to insufficient power. In addition, by monitoring voltage changes in real time and taking corresponding control measures, the stability of the system can be significantly improved. It can respond promptly when the voltage is abnormal, thereby avoiding serious consequences such as system crash or data loss.

[0037] See also Figure 2 and Figure 3 As shown, in one embodiment, when the power supply of the Vin terminal is abnormal, the voltage of the Vout terminal will gradually decrease. When the voltage of the Vout terminal is lower than the set value, the switch control module 22 is turned on, and the energy storage capacitor module 12 discharges to the Vout terminal to make the voltage of the Vout terminal rise above the set value. Then the switch control module 22 is turned off, and the voltage of the Vout terminal drops below the set value again. The switch control module 22 is turned on again, and the energy storage capacitor module 12 starts to discharge to the Vout terminal again, and the cycle is repeated until the energy storage capacitor module 12 is exhausted.

[0038] Specifically, when the power supply at the Vin terminal is abnormal, the voltage at the Vout terminal will gradually decrease. At this time, the voltage detection module 21 will monitor the voltage level at the Vout terminal in real time, and respond immediately when the voltage is lower than the set value. Once the voltage at the Vout terminal is lower than the set value, the voltage detection module 21 will output a control signal to open the switch control module 22. Subsequently, the energy storage capacitor module 12 begins to discharge to the Vout terminal to supplement the power shortage, so that the voltage at the Vout terminal rises back to above the set value, and then the voltage detection module 21 will output a control signal to close the switch control module 22, the energy storage capacitor module 12 stops discharging, and the voltage at the Vout terminal will gradually decrease again. When the voltage is lower than the set value again, the switch control module 22 will open again, and the energy storage capacitor module 12 will continue to discharge. This process will be repeated until the energy storage capacitor module 12 is exhausted. In addition, in the case of abnormal power supply at the Vin terminal, the technology can provide temporary power support for the SSD. Through the discharge of the energy storage capacitor module 12, it can slow down the rate of decline of the Vout terminal voltage to a certain extent, and buy more time for the SSD to complete the data protection operation or wait for the recovery of the external power supply. Since the data in the SSD is often stored in a non-volatile memory (such as NAND flash memory), but stable power support is required during the writing and erasing process, the technology helps to reduce the risk of data loss caused by insufficient power by ensuring the stability of the Vout terminal voltage. In addition, by accurately controlling the discharge process of the energy storage capacitor module 12, the technology can ensure the effective use and distribution of electricity. It only starts to discharge when the Vout terminal voltage is lower than the set value, thereby avoiding unnecessary energy waste. In the case of a sudden power failure, the technology can provide timely power support for the SSD to ensure the integrity and security of the data, which is particularly important for application scenarios such as data centers and servers that require uninterrupted operation.

[0039] See also Figure 3 As shown, the working scenario of the buck conversion hot backup circuit is as follows:

[0040] Specifically, the set value should be lower than the voltage that the power management module 11 controls the energy storage capacitor module 12 to discharge to the Vout terminal, but higher than the minimum voltage required for the normal operation of the SSD. For example, the power management module 11 controls the energy storage capacitor module 12 to discharge to the Vout terminal to be 8.6V, and the minimum voltage required for the normal operation of the SSD is 7V, then the set value can be set to 8.4V. Among them, the SSD disk works normally, the power management IC in the PLP circuit charges the voltage of the energy storage capacitor to 31V normally, and controls the Vin terminal: 12V output to the Vout terminal to power the SSD. When the SSD is in a normal working scenario and the power management IC is normal, when the external power supply Vin terminal: 12V is powered off, Vin terminal: 12V cannot continue to be output to the Vout terminal, and the voltage of the Vout terminal starts to drop from 12V. The power management IC detects that the voltage of the Vout terminal drops to 8.4V through the voltage detection circuit (i.e., the voltage detection module 21), and will control its internal buck converter to release the energy stored in the high voltage capacitor to the Vout terminal at a lower voltage of 8.6V, so that the voltage of the Vout terminal is maintained at 8.6V to power the SSD until the energy in the energy storage capacitor is exhausted. Since the voltage of the Vout terminal is 8.6V, which is higher than the starting voltage of the buck conversion hot backup circuit 8.4V, the buck conversion hot backup circuit will not work. When the SSD is in normal working scenario, and the power management IC is abnormal and cannot control its internal buck converter to work normally: when the external power supply Vi n terminal: 12V is powered off, Vi n terminal: 12V can no longer be output to the Vout terminal, and the voltage at the Vout terminal starts to drop from 12V. When it drops to 8.4V, the switch control circuit starts to work to control the discharge of the energy storage capacitor, so that the Vout terminal voltage is maintained at 8.4V to power the SSD until the energy of the energy storage capacitor is exhausted, thereby realizing hot backup of the PLP power-off protection function.

[0041] Specifically, the sampling point of the Vout terminal in the voltage detection circuit must be connected to the Vout terminal output of the switch control circuit as short as possible to ensure that the voltage output from the energy storage capacitor to the Vout terminal is sampled and feedback controlled at the first time to avoid slow control resulting in large ripple when the energy storage capacitor is discharged to the Vout terminal.

[0042] See also Figure 4 As shown, in one embodiment, the power management module 11 includes a controller U1, and two ends of the controller U1 are respectively connected to the Vin terminal and the Vout terminal; the energy storage capacitor module 12 and the switch control module 22 are both connected to the controller U1.

[0043] Specifically, the model of the controller U1 is SY72001. When the SSD disk works normally, the controller U1 charges the voltage of the energy storage capacitor to 31V normally, and controls the Vin terminal: 12V is output to the Vout terminal to power the SSD.

[0044] See also Figure 4 As shown, in one embodiment, the energy storage capacitor module 12 includes an energy storage capacitor C1, one end of the energy storage capacitor C1 is connected to the controller U1 and the switch control module 22, and the other end is connected to GND.

[0045] Specifically, the main function of the energy storage capacitor C1 is to store electric energy. When the power supply (Vi n end) is powered normally, the energy storage capacitor C1 will charge and store electric energy. When the power supply (Vi n end) is abnormal or the output voltage (Vout end) drops, the switch control module 22 controls the energy storage capacitor C1 to release the stored electric energy to the Vout end to ensure the stable operation of the system. In addition, the switch control module 22 controls the discharge process of the energy storage capacitor C1 according to the signal of the voltage detection module 21. When the voltage at the Vout end drops, the switch control module 22 is turned on, allowing the energy storage capacitor C1 to discharge to the Vout end to stabilize the voltage. In addition, through the rapid discharge of the energy storage capacitor C1, the sudden drop of the output voltage (Vout end) can be effectively prevented, and the system is protected from the influence of voltage fluctuations. In addition, due to the coordinated work of the energy storage capacitor C1 and the switch control module 22, the system can respond quickly to voltage changes and ensure that power support is provided immediately when the power supply is abnormal.

[0046] See also Figure 4 As shown, in one embodiment, the voltage detection module 21 includes a transistor T2, a resistor R2 and a resistor R3, the E pole of the transistor T2 is connected to GND, the resistor R2 and the resistor R3 are connected to the B pole of the transistor T2, the resistor R2 is also connected to the switch control module 22 and the Vout end, the resistor R3 is also connected to GND, and the C pole of the transistor T2 is also connected to the switch control module 22.

[0047] Specifically, the resistor R2 and the resistor R3 form a voltage divider circuit, which is used to divide the voltage at the Vout terminal and input it to the B pole of the transistor T2, so that the B pole of the transistor T2 can receive a voltage signal proportional to the voltage at the Vout terminal. The transistor T2 plays the role of a voltage comparator here. When the voltage at the Vout terminal passes through the voltage divider circuit, if it is higher than the conduction voltage of the transistor T2, the transistor T2 will be turned on; if it is lower than this threshold, the transistor T2 will be turned off. The C pole of the transistor T2 is connected to the switch control module 22, so the conduction or cut-off state of the transistor T2 will directly affect the output of the switch control module 22; when the transistor T2 is turned on, it will output a control signal to the switch control module 22, and this signal can trigger the switch control module 22 to perform a corresponding action (such as closing the discharge channel). Since the conduction or cut-off state of the transistor T2 depends on the voltage at the Vout terminal, the technology can respond to the voltage change at the Vout terminal in real time. When the voltage at the Vout terminal drops to a certain set value, the transistor T2 will be turned off, thereby triggering the switch control module 22 to perform corresponding protection measures (such as allowing the energy storage capacitor C1 to discharge to supplement power).

[0048] See also Figure 4 As shown, in one embodiment, the switch control module 22 includes a MOS tube T1, a MOS tube T3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R9 and a resistor R10, the S pole of the MOS tube T3 is connected to GND, the G pole of the MOS tube T3 is connected to the resistor R7, the D pole of the MOS tube T3 is connected to the resistor R9, the resistor R7, the resistor R10 and the C pole of the transistor T2 are all connected to the resistor R4, the D pole of the MOS tube T1 is connected to the resistor R2 and the Vout terminal, the G pole of the MOS tube T1 is connected to the resistor R5, the resistor R5 is connected to the resistor R6 and the resistor R9, the S pole of the MOS tube T1, the resistor R4 and the resistor R6 are all connected to the controller U1 and the energy storage capacitor C1.

[0049] Specifically, MOS tube T1, transistor T2 and MOS tube T3 are key components, and the key parameters of these three components are as follows:

[0050] Transistor T2: Vth = 0.7V;

[0051] N communication small signal MOS tube T3: VGS: -20V~20V, VGS(th): 1.0V~2.5V;

[0052] P communication power MOS tube T1: VGS: -20V~20V, VGS(th): -1.0V~-2.5V;

[0053] In the voltage detection circuit, transistor T2 uses resistors R2 and R3 to divide the voltage on the Vout terminal to generate the B pole VF1 signal to control the opening and closing. Since the transistor T2 opening voltage Vth is 0.7V, when the voltage on the Vout terminal is higher than 0.7*(R2+R3) / R3=0.7*(22+2) / 2=8.4V, the transistor T2's VBE>0.7V, the transistor T2 is turned on, the C pole and the E pole are turned on, and VF2 is shorted to GND to 0V. When the voltage on the Vout terminal is lower than 8.4V, the transistor T2's VBE<0.7V, the transistor T2 is turned off, the C pole and the E pole are not turned on, and the VF2 voltage is the voltage Vcap on the energy storage capacitor C1 divided by the resistors R4 and R10, and the voltage division value is Vcap*R10 / (R4+R10)=Vcap*10 / (10+10)=Vcap / 2.

[0054] In the switch control circuit, the MOS tube T3 uses the G-pole VF2 signal to control the opening and closing of the MOS tube T3: when VF2 is shorted to the ground at 0V, the VGS of the MOS tube T3 is 0V, which is less than the opening voltage VGS(th) of the MOS tube T3, the MOS tube T3 is turned off, the D-pole and the S-pole of the MOS tube T3 are not conducting, and the G-pole VF3 level of the MOS tube T1 is directly pulled up by the resistor R6 to the level Vcap of the energy storage capacitor C1, then the VGS of the MOS tube T1 is 0V, which is greater than the opening voltage VGS(th) of the MOS tube T1, the MOS tube T1 is turned off, the D-pole and the S-pole of the MOS tube T1 are not conducting, and the energy storage capacitor is not discharged;

[0055] When VF2 is at level Vcap / 2, VGS of MOS tube T3 is Vcap / 2. Before the voltage Vcap of energy storage capacitor C1 is discharged and drops to 5V (VGS=5 / 2=2.5V), it can be greater than the maximum turn-on voltage VGS(th) of MOS tube T3. MOS tube T3 is turned on, and the D and S poles of MOS tube T3 are turned on. The G pole VF3 level of MOS tube T1 is the voltage Vcap on energy storage capacitor C1 divided by resistors R6 and R9, and the voltage divided value is Vc ap*R9 / (R6+R9)=Vcap*5.1 / (10+5.1)=Vcap / 3, then VGS of MOS tube T1=-Vcap*2 / 3. Before the voltage Vcap of energy storage capacitor C1 is discharged and drops to 3.75V (VGS=-3.75*2 / 2=-2.5V), it can be less than the maximum turn-on voltage VGS(th) of MOS tube T1. MOS tube T1 is turned on, the D pole and S pole of MOS tube T1 are turned on, and energy storage capacitor C1 starts to discharge.

[0056] The working status of each device in the circuit is summarized as follows:

[0057] Vout Transistor T2 N communication MOS tube T3 P communication MOS tube T1 Energy storage capacitor C1 >8.4V Open closure closure No discharge <8.4V closure Enable (Vcap>5V) Enable (Vcap>3.75V) Discharge to Vout

[0058] That is, when the voltage on the Vout terminal drops below 8.4V, the step-down conversion hot backup circuit controls the energy storage capacitor C1 to discharge to the Vout terminal, so that the voltage on the Vout terminal rises back to above 8.4V, and then the step-down conversion hot backup circuit controls the energy storage capacitor C1 not to discharge, and the voltage on the Vout terminal drops below 8.4V again, and the step-down conversion hot backup circuit controls the energy storage capacitor C1 to discharge to the Vout terminal again, and so on and so forth, and after filtering by the capacitor on the Vout terminal, the voltage on the Vout terminal is finally stabilized at 8.4V to supply power to the SSD, until the voltage of the energy storage capacitor C1 drops to 5V, and then it stops discharging. That is, when the voltage on the Vout terminal drops to 8.4V, the step-down conversion hot backup circuit starts to work to control the energy storage capacitor to discharge (the Vcap voltage starts to drop), so that the voltage on the Vout terminal is maintained at 8.4V, and when the voltage on the Vcap drops to 5V, the step-down conversion hot backup circuit stops working.

[0059] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A control circuit supporting SSD power-off protection, characterized in that: include: A power-off protection unit and a step-down conversion hot backup unit connected to the power-off protection unit, the power-off protection unit includes a power management module and an energy storage capacitor module, the step-down conversion hot backup unit includes a voltage detection module and a switch control module, the power management module is provided with a Vin terminal and a Vout terminal, the Vin terminal is used to connect an external power supply, and the Vout terminal is used to power the SSD; the voltage detection module is used to detect the voltage of the Vout terminal to output a control signal of the switch control module, and the switch control module is used to control the energy storage capacitor module to discharge to the Vout terminal.

2. The control circuit supporting SSD power-off protection according to claim 1, characterized in that: When the voltage detection module detects that the voltage at the Vout terminal is higher than a set value, it outputs a low-level control signal to control the switch control module to be turned off, so that the energy storage capacitor module does not discharge to the Vout terminal.

3. The control circuit supporting SSD power-off protection according to claim 2, characterized in that: When the voltage detection module detects that the voltage at the Vout terminal is lower than the set value, it outputs a high-level control signal to control the switch control module to open, so that the energy storage capacitor module starts to discharge to the Vout terminal.

4. The control circuit supporting SSD power-off protection according to claim 3, characterized in that: When the power supply of the Vin terminal is abnormal, the voltage of the Vout terminal will gradually decrease. When the voltage of the Vout terminal is lower than the set value, the switch control module is turned on, and the energy storage capacitor module discharges to the Vout terminal to make the voltage of the Vout terminal rise above the set value. Then the switch control module is turned off, and the voltage of the Vout terminal drops below the set value again. The switch control module is turned on again, and the energy storage capacitor module starts to discharge to the Vout terminal again. This cycle repeats until the energy storage capacitor module is exhausted.

5. The control circuit supporting SSD power-off protection according to claim 4, characterized in that: The power management module includes a controller U1, and two ends of the controller U1 are respectively connected to the Vin end and the Vout end; the energy storage capacitor module and the switch control module are both connected to the controller U1.

6. The control circuit supporting SSD power-off protection according to claim 5, characterized in that: The energy storage capacitor module includes an energy storage capacitor C1 , one end of which is connected to the controller U1 and the switch control module, and the other end of which is connected to GND.

7. The control circuit supporting SSD power-off protection according to claim 6, characterized in that: The voltage detection module includes a transistor T2, a resistor R2 and a resistor R3, the E pole of the transistor T2 is connected to GND, the resistor R2 and the resistor R3 are connected to the B pole of the transistor T2, the resistor R2 is also connected to the switch control module and the Vout end, the resistor R3 is also connected to GND, and the C pole of the transistor T2 is also connected to the switch control module.

8. The control circuit supporting SSD power-off protection according to claim 7, characterized in that: The switch control module includes a MOS tube T1, a MOS tube T3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R9 and a resistor R10. The S pole of the MOS tube T3 is connected to GND, the G pole of the MOS tube T3 is connected to the resistor R7, the D pole of the MOS tube T3 is connected to the resistor R9, the resistor R7, the resistor R10 and the C pole of the triode T2 are all connected to the resistor R4, the D pole of the MOS tube T1 is connected to the resistor R2 and the Vout terminal, the G pole of the MOS tube T1 is connected to the resistor R5, the resistor R5 is connected to the resistor R6 and the resistor R9, and the S pole of the MOS tube T1, the resistor R4 and the resistor R6 are all connected to the controller U1 and the energy storage capacitor C1.

9. The control circuit supporting SSD power-off protection according to claim 5, characterized in that: The model of the controller U1 is SY72001.

10. The control circuit supporting SSD power-off protection according to claim 2, characterized in that: The set value is 8.4V.

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