A backup power supply circuit, method and system

Abstract

The present invention discloses a backup power supply circuit, method and system, wherein the backup power supply circuit comprises a main control module, a DC power supply, a boost module, a hot standby module and a comparison module, wherein the output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module. The backup power supply circuit of the present invention is suitable for storage products such as solid-state hard disks, and can ensure that the voltage on the DC bus of the solid-state hard disk is kept within a safe threshold range, thereby improving the reliability of the solid-state hard disk, thereby improving the yield rate of the overall product, while reducing production costs and increasing product competitiveness.

Description

Technical Field

[0001] The present invention belongs to the field of electronic technology, and in particular relates to a backup power supply circuit, method and system. Background Art

[0002] In the era of big data, with the continuous development of computers, higher requirements are placed on the reliability of computer storage functions. Among them, the reliability of the backup power device for the storage system is extremely important.

[0003] The backup power supply circuit is suitable for storage products such as solid state drives (SSDs). In order to prevent abnormal power failure of the SSDs and cause data storage errors, the SSDs are generally equipped with a backup power supply circuit. When the SSD detects that the DC bus voltage is lower than the first threshold, the SSD stops accepting new tasks and enters the backup power supply process. The backup power supply circuit starts working to ensure that the SSD completes the remaining tasks.

[0004] However, since the previous backup power supply circuit was a cold standby, there is a large time delay from when the backup power supply circuit receives the startup command to when it successfully starts. If the backup power supply process is entered during the capacitor self-test, the time delay will be even greater, which will cause the DC bus voltage to drop severely, thereby affecting the reliability of the solid-state drive. Summary of the invention

[0005] In order to solve the problems of the prior art, the present invention provides a backup power supply circuit, method and system, wherein the backup power supply circuit includes a main control module, a DC power supply, a boost module, a hot standby module and a comparison module, wherein the output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module. The backup power supply circuit of the present invention is suitable for storage products such as solid-state hard disks, and can ensure that the voltage on the DC bus of the solid-state hard disk remains within a safe threshold range, thereby improving the reliability of the solid-state hard disk, thereby improving the overall product yield, while reducing production costs and increasing product competitiveness.

[0006] The technical solution is as follows:

[0007] In a first aspect, the present invention provides a backup power supply circuit, the backup power supply circuit comprising a main control module, a DC power supply, a boost module, a hot standby module, and a comparison module.

[0008] The output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module;

[0009] The hot standby module includes a first MOS tube and a second MOS tube; the comparison module includes a first comparator; the input end of the boost module is connected to the inverting input end of the first comparator, the non-inverting input end of the first comparator is connected to the reference voltage end, and the output end of the first comparator is connected to the gate of the first MOS tube; the source of the first MOS tube is connected to the input end of the boost module, and the drain of the first MOS tube is connected to the source of the second MOS tube; the drain of the second MOS tube is connected to the output end of the boost module, and the gate of the second MOS tube is connected to the first output end of the main control module;

[0010] The boost module includes a first inductor and a third MOS tube; the output end of the DC power supply is connected to the first end of the first inductor, and the second end of the first inductor is connected to the drain of the third MOS tube; the source of the third MOS tube is grounded, and the gate of the third MOS tube is connected to the second output end of the main control module;

[0011] The first end of the first inductor serves as the input end of the boost module; the drain of the second MOS transistor serves as the input end of the hot standby module, and the source of the first MOS transistor serves as the output end of the hot standby module.

[0012] In some embodiments, the hot standby module further includes a second inductor.

[0013] The second inductor is connected between the drain of the first MOS tube and the source of the second MOS tube;

[0014] The second inductor is used to reduce the voltage of the hot standby module.

[0015] In some embodiments, the boost module further includes a first diode,

[0016] The drain of the third MOS transistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the drain of the second MOS transistor;

[0017] The cathode of the first diode serves as the output end of the boost module;

[0018] The first diode is used to boost the voltage of the boost module.

[0019] In some embodiments, the backup power supply circuit further includes an external capacitor,

[0020] The output end of the boost module is connected to the input end of the external capacitor;

[0021] The external capacitor is used to store the electric energy of the backup power supply circuit.

[0022] In some embodiments, the backup power supply circuit further includes a capacitance management module.

[0023] The output end of the external capacitor is connected to the input end of the capacitor management module, and the output end of the capacitor management module is connected to the first input end of the main control module;

[0024] The capacitance management module is used to detect the electric quantity of the external capacitor.

[0025] In some embodiments, the backup power supply circuit further includes a fourth MOS transistor,

[0026] The cathode of the first diode is connected to the drain of the fourth MOS tube, the source of the fourth MOS tube is connected to the drain of the second MOS tube, and the gate of the fourth MOS tube is connected to the third output terminal of the main control module;

[0027] The fourth MOS tube is used to cut off the backup power supply circuit when the capacitance management module detects the electric quantity of the external capacitance.

[0028] In some embodiments, the backup power supply circuit further includes an input protection module.

[0029] The output end of the DC power supply is connected to the input end of the input protection module, the first output end of the input protection module is connected to the input end of the boost module, and the second output end of the input protection module is connected to the second input end of the main control module;

[0030] The input protection module is used to perform slow-start protection on the backup power supply circuit.

[0031] In some embodiments, the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor are all N-channel MOS transistors.

[0032] In a second aspect, the present invention further provides a backup power supply method, the method comprising:

[0033] Setting the internal reference voltage of the backup power supply circuit to a first threshold;

[0034] Obtaining a voltage value at an input end of the boost module;

[0035] Comparing the voltage value at the input end of the boost module with the first threshold value;

[0036] When the voltage value of the input end of the boost module is less than the first threshold, the output end of the comparator outputs a voltage, turns on the first MOS tube, and supplies power to the input end of the boost module.

[0037] In a third aspect, the present invention further provides a backup power supply system, the system comprising a backup power supply circuit as described in any one of the first aspects.

[0038] The beneficial effects brought by the technical solution disclosed in the embodiment of the present invention are:

[0039] The present invention discloses a backup power supply circuit, method and system, wherein the backup power supply circuit comprises a main control module, a DC power supply, a boost module, a hot standby module and a comparison module, wherein the output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module. The backup power supply circuit of the present invention is suitable for storage products such as solid-state hard disks, and can ensure that the voltage on the DC bus of the solid-state hard disk is kept within a safe threshold range, thereby improving the reliability of the solid-state hard disk, thereby improving the yield rate of the overall product, while reducing production costs and increasing product competitiveness.

[0040] According to the technical solution disclosed in the embodiment of the present invention, when the voltage value of the DC bus is less than the first threshold value, the output end of the comparator outputs a high voltage, turns on the first MOS tube, supplies power to the DC bus, and ensures that the voltage on the DC bus is stable within a certain range, thereby solving the previous problems of long startup delay of the cold standby circuit and serious power-off of the DC bus voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] After reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings, the above-mentioned features and advantages of the present invention can be better understood. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work.

[0042] Figure 1 The overall structure diagram of the backup power supply circuit of the present invention is shown;

[0043] Figure 2 A flow chart of the backup power supply method according to the present invention is shown;

[0044] Figure annotation:

[0045] Q1, a first MOS tube; Q2, a second MOS tube; Q3, a third MOS tube; Q4, a fourth MOS tube; L1, a first inductor; L2, a second inductor; A1, a first comparator; D1, a first diode. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] It should be noted that 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. In the description of the present invention, "multiple" or "several" means more than two, unless otherwise clearly and specifically defined.

[0048] Embodiment 1

[0049] The embodiment of the present invention provides a backup power supply circuit, such as Figure 1 As shown, the backup power supply circuit includes a main control module, a DC power supply, a boost module, a hot standby module, and a comparison module.

[0050] The output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module;

[0051] The hot standby module includes a first MOS transistor Q1 and a second MOS transistor Q2; the comparison module includes a first comparator A1; the input end of the boost module is connected to the inverting input end of the first comparator A1, the non-inverting input end of the first comparator A1 is connected to the reference voltage end, and the output end of the first comparator A1 is connected to the gate of the first MOS transistor Q1; the source of the first MOS transistor Q1 is connected to the input end of the boost module, and the drain of the first MOS transistor Q1 is connected to the source of the second MOS transistor Q2; the drain of the second MOS transistor Q2 is connected to the output end of the boost module, and the gate of the second MOS transistor Q2 is connected to the first output end of the main control module;

[0052] The boost module includes a first inductor L1 and a third MOS transistor Q3; the output end of the DC power supply is connected to the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the drain of the third MOS transistor Q3; the source of the third MOS transistor Q3 is grounded, and the gate of the third MOS transistor Q3 is connected to the second output end of the main control module;

[0053] The first end of the first inductor L1 serves as the input end of the boost module; the drain of the second MOS transistor Q2 serves as the input end of the hot standby module, and the source of the first MOS transistor Q1 serves as the output end of the hot standby module.

[0054] The first inductor L1 is used to boost the voltage of the boost module.

[0055] Specifically, in this embodiment, the backup power supply circuit is suitable for solid-state hard disk (SSD) storage products, and the backup power supply circuit includes a main control module, a DC power supply, a boost module, a hot standby module, and a comparison module. The hot standby module of the backup power supply circuit always keeps working. When the voltage of the DC bus is lower than the first threshold of the internal reference voltage, after a delay of nanoseconds, the first MOS tube Q1 in the hot standby module is turned on to supply power to the DC bus, ensuring that the voltage on the DC bus is stable within a certain range, preventing the DC bus from losing power seriously, solving the problem of too long startup delay of the cold standby power circuit, resulting in too low voltage of the DC bus, and improving the reliability of the solid-state hard disk.

[0056] Here, the DC bus is located at the input end of the boost module; the first threshold is 9V; and the reference voltage Vref input to the non-inverting input end of the first comparator A1 is 2.5V.

[0057] In this embodiment, the hot standby module further includes a second inductor L2.

[0058] The second inductor L2 is connected between the drain of the first MOS transistor Q1 and the source of the second MOS transistor Q2;

[0059] The second inductor L2 is used to reduce the voltage of the hot standby module.

[0060] Specifically, the hot standby module includes a voltage reduction unit, and the voltage reduction unit includes a second inductor L2. The second inductor L2 is used to reduce the voltage of the hot standby module.

[0061] In this embodiment, the boost module further includes a first diode D1.

[0062] The drain of the third MOS transistor Q3 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the drain of the second MOS transistor Q2;

[0063] The cathode of the first diode D1 serves as the output end of the boost module;

[0064] The first diode D1 is used to boost the voltage of the boost module.

[0065] In this embodiment, the backup power supply circuit further includes an external capacitor.

[0066] The output end of the boost module is connected to the input end of the external capacitor;

[0067] The external capacitor is used to store the electric energy of the backup power supply circuit.

[0068] Specifically, the boost module can increase the voltage of the DC bus and store the electric energy of the backup power supply circuit in an external capacitor.

[0069] For example, the boost module can increase the voltage of the DC bus to 32V, and store the electric energy of the backup power supply circuit in the external capacitor. At this time, the voltage of the external capacitor is 32V.

[0070] In this embodiment, the backup power supply circuit further includes a capacitance management module.

[0071] The output end of the external capacitor is connected to the input end of the capacitor management module, and the output end of the capacitor management module is connected to the first input end of the main control module;

[0072] The capacitance management module is used to detect the electric quantity of the external capacitor.

[0073] Specifically, the capacitor management module may periodically detect the power level of the external capacitor, and upload the power level detection result to the main control module.

[0074] In this embodiment, the backup power supply circuit further includes a fourth MOS transistor Q4.

[0075] The cathode of the first diode D1 is connected to the drain of the fourth MOS transistor Q4, the source of the fourth MOS transistor Q4 is connected to the drain of the second MOS transistor Q2, and the gate of the fourth MOS transistor Q4 is connected to the third output terminal of the main control module;

[0076] The fourth MOS transistor Q4 is used to cut off the backup power supply circuit when the capacitance management module detects the electric quantity of the external capacitance.

[0077] Specifically, the fourth MOS transistor Q4 is normally in a conducting state. When the capacitance management module detects the electric quantity of the external capacitor, the fourth MOS transistor Q4 is turned off to cut off the backup power supply circuit.

[0078] In this embodiment, the backup power supply circuit further includes an input protection module.

[0079] The output end of the DC power supply is connected to the input end of the input protection module, the first output end of the input protection module is connected to the input end of the boost module, and the second output end of the input protection module is connected to the second input end of the main control module;

[0080] The input protection module is used to perform slow-start protection on the backup power supply circuit.

[0081] Specifically, the input protection module mainly has functions such as slow start and protection for the backup power supply circuit.

[0082] In this embodiment, the first MOS transistor Q1 , the second MOS transistor Q2 , the third MOS transistor Q3 , and the fourth MOS transistor Q4 are all N-channel MOS transistors.

[0083] Specifically, the backup power supply circuit includes a main control module, a boost module, a hot standby module, a comparison module, an input protection module, a capacitor management module, and an external capacitor. The first, second, and third output terminals of the main control module can output pulse width modulation (PWM) to control the on and off of the second MOS tube Q2, the third MOS tube Q3, and the fourth MOS tube Q4 to complete the functions of boosting and reducing voltage, and the parameters of other modules can be changed by configuring the registers of the main control module. At the same time, the main control module can communicate with the outside through the network to transmit the detection results of the capacitor management module on the external capacitor power and the voltage of the DC bus and other information to the outside.

[0084] The pulse width modulation is an analog control method.

[0085] Here, the hot standby module plays a great role in the process of powering the DC bus. When the voltage value at the input end of the boost module, i.e., the DC bus, is less than the first threshold, the output end of the comparator outputs a voltage, turns on the first MOS tube Q1, and immediately powers the DC bus, thereby preventing the previous cold standby power supply circuit from starting up too long and causing the DC bus voltage to drop seriously. At the same time, it solves the risk that the voltage drop at the DC bus may exceed the safety threshold range when the solid-state hard disk is abnormally powered off.

[0086] Finally, the backup power supply circuit can not only be used to supply power to fixed hard disk storage devices, but also can be used in other non-storage devices that require backup power.

[0087] The beneficial effects brought by the technical solution disclosed in the embodiment of the present invention are:

[0088] The present invention discloses a backup power supply circuit, which includes a main control module, a DC power supply, a boost module, a hot standby module, and a comparison module. The output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module. The backup power supply circuit of the present invention is suitable for storage products such as solid-state hard disks, which can ensure that the voltage on the DC bus of the solid-state hard disk is kept within a safe threshold range, improve the reliability of the solid-state hard disk, and thus improve the yield rate of the overall product, while reducing production costs and increasing product competitiveness.

[0089] According to the technical solution disclosed in the embodiment of the present invention, when the voltage value of the DC bus is less than the first threshold value, the output end of the comparator outputs a high voltage, turns on the first MOS tube, supplies power to the DC bus, and ensures that the voltage on the DC bus is stable within a certain range, thereby solving the previous problems of long startup delay of the cold standby circuit and serious power-off of the DC bus voltage.

[0090] Embodiment 2

[0091] The present invention provides a backup power supply method, such as Figure 2 As shown, the method includes:

[0092] Step S1, setting the internal reference voltage of the backup power supply circuit to a first threshold.

[0093] Step S2, obtaining the voltage value of the input end of the boost module.

[0094] Step S3: compare the voltage value at the input end of the boost module with the first threshold value.

[0095] Step S4: when the voltage value of the input end of the boost module is less than the first threshold value, the output end of the comparator outputs a voltage, turns on the first MOS tube, and supplies power to the input end of the boost module.

[0096] Specifically, the hot standby module is always in working state. When the solid-state hard disk enters the backup power process, the first comparator of the comparison module compares the voltage of the DC bus with the internal reference voltage (first threshold). When the bus DC voltage is less than the internal reference voltage, the output end of the first comparator outputs a high level, turns on the first MOS tube, and supplies power to the input end of the boost module, i.e., the DC bus.

[0097] Wherein, the first threshold is 9V.

[0098] The backup power supply method provided in the embodiment of the present invention may be further improved and optimized without departing from the technical solution of the present invention, and these improvements and optimizations should also be regarded as within the protection scope of the present invention.

[0099] The beneficial effects brought by the technical solution disclosed in the embodiment of the present invention are:

[0100] The backup power supply method of the present invention is applicable to storage products such as solid-state hard disks, and can ensure that the voltage on the DC bus of the solid-state hard disk remains within a safe threshold range, thereby improving the reliability of the solid-state hard disk operation, thereby improving the overall product yield, while reducing production costs and increasing product competitiveness.

[0101] According to the technical solution disclosed in the embodiment of the present invention, when the voltage value of the DC bus is less than the first threshold value, the output end of the comparator outputs a high voltage, turns on the first MOS tube, supplies power to the DC bus, and ensures that the voltage on the DC bus is stable within a certain range, thereby solving the previous problems of long startup delay of the cold standby circuit and serious power-off of the DC bus voltage.

[0102] Embodiment 3

[0103] The present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following backup power supply method can be executed:

[0104] Setting the internal reference voltage of the backup power supply circuit to a first threshold;

[0105] Obtaining a voltage value at an input end of the boost module;

[0106] Comparing the voltage value at the input end of the boost module with the first threshold value;

[0107] When the voltage value of the input end of the boost module is less than the first threshold, the output end of the comparator outputs a voltage, turns on the first MOS tube, and supplies power to the input end of the boost module.

[0108] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0109] The backup power supply method of the present invention is applicable to storage products such as solid-state hard disks, and can ensure that the voltage on the DC bus of the solid-state hard disk remains within a safe threshold range, thereby improving the reliability of the solid-state hard disk operation, thereby improving the overall product yield, while reducing production costs and increasing product competitiveness.

[0110] According to the technical solution disclosed in the embodiment of the present invention, when the voltage value of the DC bus is less than the first threshold value, the output end of the comparator outputs a high voltage, turns on the first MOS tube, supplies power to the DC bus, and ensures that the voltage on the DC bus is stable within a certain range, thereby solving the previous problems of long startup delay of the cold standby circuit and serious power-off of the DC bus voltage.

[0111] Embodiment 4

[0112] The present invention provides a backup power supply device, which comprises a preprocessing module, an acquisition module, a comparison module and a power supply module.

[0113] In this embodiment, the preprocessing module is used to set the internal reference voltage of the backup power supply circuit to a first threshold; the acquisition module is used to acquire the voltage value of the input end of the boost module;

[0114] A comparison module, used for comparing the voltage value of the input end of the boost module with the first threshold value;

[0115] The power supply module is used for, when the voltage value of the input end of the boost module is less than a first threshold value, the output end of the comparator outputs a voltage, turns on the first MOS tube, and supplies power to the input end of the boost module.

[0116] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0117] The backup power supply device of the present invention is suitable for storage products such as solid-state hard disks, and can ensure that the voltage on the DC bus of the solid-state hard disk remains within a safe threshold range, thereby improving the reliability of the solid-state hard disk operation, thereby improving the overall product yield, while reducing production costs and increasing product competitiveness.

[0118] Embodiment 5

[0119] The present invention provides a backup power supply system, the backup power supply system comprises a backup power supply circuit, the backup power supply circuit comprises a main control module, a direct current power supply, a boost module, a hot standby module, and a comparison module.

[0120] The output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module;

[0121] The hot standby module includes a first MOS transistor Q1 and a second MOS transistor Q2; the comparison module includes a first comparator A1; the input end of the boost module is connected to the inverting input end of the first comparator A1, the non-inverting input end of the first comparator A1 is connected to the reference voltage end, and the output end of the first comparator A1 is connected to the gate of the first MOS transistor Q1; the source of the first MOS transistor Q1 is connected to the input end of the boost module, and the drain of the first MOS transistor Q1 is connected to the source of the second MOS transistor Q2; the drain of the second MOS transistor Q2 is connected to the output end of the boost module, and the gate of the second MOS transistor Q2 is connected to the first output end of the main control module;

[0122] The boost module includes a first inductor L1 and a third MOS transistor Q3; the output end of the DC power supply is connected to the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the drain of the third MOS transistor Q3; the source of the third MOS transistor Q3 is grounded, and the gate of the third MOS transistor Q3 is connected to the second output end of the main control module;

[0123] The first end of the first inductor L1 serves as the input end of the boost module; the drain of the second MOS transistor Q2 serves as the input end of the hot standby module, and the source of the first MOS transistor Q1 serves as the output end of the hot standby module.

[0124] In some embodiments, the hot standby module further includes a second inductor L2.

[0125] The second inductor L2 is connected between the drain of the first MOS transistor Q1 and the source of the second MOS transistor Q2;

[0126] The second inductor L2 is used to reduce the voltage of the hot standby module.

[0127] In some embodiments, the boost module further includes a first diode D1,

[0128] The drain of the third MOS transistor Q3 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the drain of the second MOS transistor Q2;

[0129] The cathode of the first diode D1 serves as the output end of the boost module;

[0130] The first diode D1 is used to boost the voltage of the boost module.

[0131] In some embodiments, the backup power supply circuit further includes an external capacitor,

[0132] The output end of the boost module is connected to the input end of the external capacitor;

[0133] The external capacitor is used to store the electric energy of the backup power supply circuit.

[0134] In some embodiments, the backup power supply circuit further includes a capacitance management module.

[0135] The output end of the external capacitor is connected to the input end of the capacitor management module, and the output end of the capacitor management module is connected to the first input end of the main control module;

[0136] The capacitance management module is used to detect the electric quantity of the external capacitor.

[0137] In some embodiments, the backup power supply circuit further includes a fourth MOS transistor Q4.

[0138] The cathode of the first diode D1 is connected to the drain of the fourth MOS transistor Q4, the source of the fourth MOS transistor Q4 is connected to the drain of the second MOS transistor Q2, and the gate of the fourth MOS transistor Q4 is connected to the third output terminal of the main control module;

[0139] The fourth MOS transistor Q4 is used to cut off the backup power supply circuit when the capacitance management module detects the electric quantity of the external capacitance.

[0140] In some embodiments, the backup power supply circuit further includes an input protection module.

[0141] The output end of the DC power supply is connected to the input end of the input protection module, the first output end of the input protection module is connected to the input end of the boost module, and the second output end of the input protection module is connected to the second input end of the main control module;

[0142] The input protection module is used to perform slow-start protection on the backup power supply circuit.

[0143] In some embodiments, the first MOS transistor Q1 , the second MOS transistor Q2 , the third MOS transistor Q3 , and the fourth MOS transistor Q4 are all N-channel MOS transistors.

[0144] The technical solution disclosed in the embodiment of the present invention has a simple circuit structure. The backup power supply circuit is suitable for storage products such as solid-state hard disks. It can ensure that the voltage on the DC bus of the solid-state hard disk is maintained within a safe threshold range, thereby improving the reliability of the solid-state hard disk and further improving the yield rate of the overall product, while reducing production costs and increasing product competitiveness.

[0145] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present invention, which will not be described in detail here.

[0146] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0147] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0148] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0149] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A backup power supply circuit, It is characterized in that The backup power supply circuit includes a main control module, a DC power supply, a boost module, a hot standby module, and a comparison module. The output end of the DC power supply is connected to the input end of the boost module, the output end of the boost module is connected to the input end of the hot standby module, and the output end of the hot standby module is connected to the input end of the boost module; The hot standby module includes a first MOS tube and a second MOS tube; the comparison module includes a first comparator; the input end of the boost module is connected to the inverting input end of the first comparator, the non-inverting input end of the first comparator is connected to the reference voltage end, and the output end of the first comparator is connected to the gate of the first MOS tube; the source of the first MOS tube is connected to the input end of the boost module, and the drain of the first MOS tube is connected to the source of the second MOS tube; the drain of the second MOS tube is connected to the output end of the boost module, and the gate of the second MOS tube is connected to the first output end of the main control module; The boost module includes a first inductor and a third MOS tube; the output end of the DC power supply is connected to the first end of the first inductor, and the second end of the first inductor is connected to the drain of the third MOS tube; the source of the third MOS tube is grounded, and the gate of the third MOS tube is connected to the second output end of the main control module; The first end of the first inductor serves as the input end of the boost module; the drain of the second MOS transistor serves as the input end of the hot standby module, and the source of the first MOS transistor serves as the output end of the hot standby module.

2. The backup power supply circuit according to claim 1, It is characterized in that The hot standby module also includes a second inductor, The second inductor is connected between the drain of the first MOS tube and the source of the second MOS tube; The second inductor is used to reduce the voltage of the hot standby module.

3. The backup power supply circuit according to claim 1, It is characterized in that The boost module further includes a first diode, The drain of the third MOS transistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the drain of the second MOS transistor; The cathode of the first diode serves as the output end of the boost module; The first diode is used to boost the voltage of the boost module.

4. The backup power supply circuit according to claim 1, It is characterized in that The backup power supply circuit also includes an external capacitor, The output end of the boost module is connected to the input end of the external capacitor; The external capacitor is used to store the electric energy of the backup power supply circuit.

5. The backup power supply circuit according to claim 4, It is characterized in that The backup power supply circuit also includes a capacitance management module, The output end of the external capacitor is connected to the input end of the capacitor management module, and the output end of the capacitor management module is connected to the first input end of the main control module; The capacitance management module is used to detect the electric quantity of the external capacitor.

6. The backup power supply circuit according to claim 3, It is characterized in that The backup power supply circuit also includes a fourth MOS tube, The cathode of the first diode is connected to the drain of the fourth MOS tube, the source of the fourth MOS tube is connected to the drain of the second MOS tube, and the gate of the fourth MOS tube is connected to the third output terminal of the main control module; The fourth MOS tube is used to cut off the backup power supply circuit when the capacitance management module detects the electric quantity of the external capacitance.

7. The backup power supply circuit according to claim 1, It is characterized in that The backup power supply circuit also includes an input protection module. The output end of the DC power supply is connected to the input end of the input protection module, the first output end of the input protection module is connected to the input end of the boost module, and the second output end of the input protection module is connected to the second input end of the main control module; The input protection module is used to perform slow-start protection on the backup power supply circuit.

8. The backup power supply circuit according to claim 6, It is characterized in that The first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube are all N-channel MOS tubes.

9. A backup power supply method, applied to the backup power supply circuit according to any one of claims 2 to 8, It is characterized in that The method comprises: Setting the internal reference voltage of the backup power supply circuit to a first threshold; Obtaining a voltage value at an input end of the boost module; Comparing the voltage value at the input end of the boost module with the first threshold value; When the voltage value of the input end of the boost module is less than the first threshold, the output end of the comparator outputs a voltage, turns on the first MOS tube, and supplies power to the input end of the boost module.

10. A backup power supply system, It is characterized in that The system comprises the backup power supply circuit according to any one of claims 1-8.

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