Power source reverse connection prevention circuit and solid state disk

Abstract

The application discloses a power reverse connection prevention circuit and a solid state disk, which comprises a power reverse connection prevention unit, a comparison unit, a response unit and a control unit. The input end of the first branch of the comparison unit is connected with the input end of the power reverse connection prevention unit, and the input end of the second branch is connected with the output end of the power reverse connection prevention unit. The response unit is connected with the output ends of the first branch and the second branch, and the output of the comparison unit is stored to make the voltage difference signal output to the control unit meet the preset response time. The input end of the control unit is connected with the response unit, and the output end is connected with the power reverse connection prevention unit. When the voltage difference signal is greater than the preset difference threshold, the control signal for closing the input voltage is output to the power reverse connection prevention unit. The application determines the transient drop process in time by comparing the voltage difference between the input and output of the power reverse connection prevention unit, and improves the working performance of the power reverse connection prevention circuit.

Description

Technical Field

[0001] This article relates to, but is not limited to, power protection technology, particularly a reverse power connection protection circuit and solid-state drives. Background Technology

[0002] In solid-state drive (SSD) technology, there is a type of circuit for power protection against reverse power connection. The usual practice is to use diodes or field-effect transistors (MOSFETs) to protect against reverse power connection.

[0003] Diode-based reverse connection protection circuits cannot achieve low line voltage drop loss when implementing reverse connection protection; while MOSFET-based reverse connection protection circuits can achieve low line voltage drop, they cannot meet the functional requirements during transient voltage drop.

[0004] How to achieve low line voltage drop while meeting the functional requirements during transient voltage drop in the anti-reverse power supply circuit has become a problem to be solved. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] This invention provides a reverse power connection protection circuit and a solid-state drive, which can promptly determine the transient degradation process based on the reverse power connection protection circuit, thereby improving the working performance of the reverse power connection protection circuit.

[0007] This invention provides a reverse power connection protection circuit, comprising: a reverse power connection protection unit, a comparison unit, a response unit, and a control unit; wherein,

[0008] The comparison unit includes a first branch and a second branch; wherein, the input terminal of the first branch is connected to the input terminal of the reverse power supply protection unit, and the input terminal of the second branch is connected to the output terminal of the reverse power supply protection unit.

[0009] The response unit is connected to the output terminals of the first branch and the second branch, and is configured to process energy to ensure that the voltage difference signal between the output terminals of the first branch and the second branch, which is output to the control unit, meets a preset response time.

[0010] The input terminal of the control unit is connected to the response unit, and the output terminal is connected to the reverse power supply protection unit. It is configured to receive the voltage difference signal from the response unit. When the voltage difference signal is greater than the preset difference threshold, it outputs a control signal to the reverse power supply protection unit to shut off the input voltage.

[0011] In another aspect, embodiments of the present invention also provide a solid-state drive (SSD), characterized in that the SSD power supply is connected to the aforementioned reverse power connection protection circuit. The reverse power connection protection circuit of this application includes: a reverse power connection protection unit, a comparison unit, a response unit, and a control unit; wherein the comparison unit includes a first branch and a second branch; wherein the input terminal of the first branch is connected to the input terminal of the reverse power connection protection unit, and the input terminal of the second branch is connected to the output terminal of the reverse power connection protection unit; the response unit is connected to the output terminals of the first branch and the second branch, configured to, through energy storage processing, ensure that the voltage difference signal between the output terminals of the first branch and the second branch output to the control unit meets a preset response time; the input terminal of the control unit is connected to the response unit, and the output terminal is connected to the reverse power connection protection unit, configured to receive the voltage difference signal from the response unit, and when the voltage difference signal is greater than a preset difference threshold, output a control signal to the reverse power connection protection unit to shut off the input voltage. Based on the reverse power connection protection circuit, embodiments of the present invention improve the working performance of the reverse power connection protection circuit by comparing the voltage difference between the input and output of the reverse power connection protection unit and promptly determining the transient drop process.

[0012] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0014] Figure 1 This is a structural block diagram of the reverse power supply protection circuit according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the reverse power supply protection circuit according to an embodiment of the present invention;

[0016] Figure 3 This is a simulation diagram of an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0018] The steps illustrated in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than that presented here.

[0019] Figure 1 This is a structural block diagram of the reverse power supply protection circuit according to an embodiment of the present invention, as shown below. Figure 1 As shown, it includes: a reverse power connection protection unit, a comparison unit, a response unit, and a control unit; wherein,

[0020] The comparison unit includes a first branch and a second branch; wherein, the input terminal of the first branch is connected to the input terminal of the reverse power supply protection unit, and the input terminal of the second branch is connected to the output terminal of the reverse power supply protection unit.

[0021] The response unit is connected to the output terminals of the first branch and the second branch, and is configured to process energy to ensure that the voltage difference signal between the output terminals of the first branch and the second branch, which is output to the control unit, meets a preset response time.

[0022] The input terminal of the control unit is connected to the response unit, and the output terminal is connected to the reverse power supply protection unit. It is configured to receive the voltage difference signal from the response unit. When the voltage difference signal is greater than the preset difference threshold, it outputs a control signal to the reverse power supply protection unit to shut off the input voltage.

[0023] In one exemplary instance, the control signal for turning off the input voltage in this embodiment of the invention includes a signal for turning off the input voltage of the first field-effect transistor Q1.

[0024] Based on the reverse power connection protection circuit, this embodiment of the invention improves the working performance of the reverse power connection protection circuit by comparing the voltage difference between the input and output of the reverse power connection protection unit to promptly determine the transient drop process.

[0025] In one exemplary embodiment, the reverse power connection protection unit of this invention includes: a reverse power connection protection unit comprising a first field-effect transistor Q1; wherein

[0026] The input terminal of the first branch is connected to the source of the first field-effect transistor Q1, and the input terminal of the second branch is connected to the drain of the first field-effect transistor Q1.

[0027] In one exemplary instance, an embodiment of the present invention is as follows:

[0028] The first branch includes a first resistor R1 and a first diode D1. The first end of the first resistor R1 is connected to the source of the first field-effect transistor, and the second end of the first resistor R1 is connected to the positive terminal of the first diode D1.

[0029] The second branch includes a second resistor R2 and a second diode D2. The first end of the second resistor R2 is connected to the drain of the first field-effect transistor, and the second end of the second resistor R2 is connected to the anode of the second diode D2.

[0030] After the negative terminal of the first diode D1 is connected to the negative terminal of the second diode D2, the response unit is connected.

[0031] In one exemplary instance, the comparison unit of this embodiment of the invention can also be implemented by other types of circuits, as long as the circuit can compare the input voltage and output voltage of the reverse power supply protection unit.

[0032] In one exemplary instance, the response unit of this embodiment of the invention includes a first capacitor C1, the first end of the first capacitor C1 is connected to the output terminal of the first branch and the output terminal of the second branch, and the second end of the first capacitor C1 is grounded.

[0033] In one exemplary instance, the response unit of this embodiment of the invention can be replaced by other circuits or components with energy storage functions. The response time is controlled through the energy storage process of the response unit. At the same time, the processing of the response unit also provides a voltage difference signal for the control unit to output the control signal.

[0034] In one exemplary embodiment, the control unit of this invention includes: a second field-effect transistor Q2 and a third diode D3; wherein,

[0035] The emitter of the second field-effect transistor Q2 is connected to the first terminal of the first capacitor C1, the base of the second field-effect transistor Q2 is connected to the second terminal of the first resistor R1, the collector of the second field-effect transistor Q2 is connected to the positive terminal of the third diode D3, and the negative terminal of the third diode D3 is connected to the gate of the first field-effect transistor Q1.

[0036] In this embodiment of the invention, the base of the second field-effect transistor Q2 is connected to the second end of the first resistor R1, which is equivalent to the base of the second field-effect transistor Q2 being connected to the positive terminal of the first diode D1.

[0037] In one exemplary instance, the turn-on voltage of the second field-effect transistor Q2 in this embodiment of the invention is one of the following voltage values:

[0038] 0.2 volts to 0.7 volts.

[0039] In one exemplary instance, the capacitance value of the first capacitor C1 in this embodiment of the invention is positively correlated with the response time; in other words, the larger the capacitance value of the first capacitor C1, the longer the response time.

[0040] In one exemplary embodiment, the reverse power connection protection unit of this invention further includes a Zener diode D4 and a third resistor R3; wherein,

[0041] The drain of the first field-effect transistor Q1 is connected to the negative terminal of the Zener diode D4, the gate of the first field-effect transistor Q1 is connected to the negative terminal of the Zener diode D4, the gate of the first field-effect transistor Q1 is connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is grounded.

[0042] In one exemplary embodiment, the present invention may also refer to related technologies to connect a capacitor Cin with its input terminal grounded between the positive terminal of the power supply and the source terminal of the first field-effect transistor Q1, and a capacitor Cout with its output terminal grounded between the negative terminal of the power supply and the drain terminal of the first field-effect transistor Q1.

[0043] Figure 2 This is a schematic diagram of the reverse power supply protection circuit according to an embodiment of the present invention, as shown below. Figure 2 As shown, the first field-effect transistor Q1, the Zener diode D4, and the third resistor R3 constitute the aforementioned reverse power supply protection unit; the first resistor R1, the first diode D1, the second resistor R2, and the second diode D2 constitute the comparison unit of this embodiment; the first inductor C1 is a component of the response unit; the control unit is composed of the second field-effect transistor Q2 and the third diode D3; referring to related technologies, in this embodiment, a capacitor Cin with its input terminal grounded is connected between the positive terminal of the power supply and the source terminal of the first field-effect transistor Q1, and a capacitor Cout with its output terminal grounded is connected between the negative terminal of the power supply and the drain terminal of the first field-effect transistor Q1. In this embodiment of the invention, when the input voltage of the device connected to the reverse connection protection circuit of this embodiment drops transiently, a certain voltage drop is generated on both sides of the MOS located in the reverse connection protection, wherein the S (source) voltage of the input terminal is lower than the D (drain) voltage; because the voltage of the first capacitor C1 at the front end cannot change abruptly, the second field-effect transistor Q2 (transistor Q2) in the output circuit conducts and outputs a control signal (control voltage); when the first field-effect transistor reaches the shutdown condition, the voltage input is turned off; at this time, the energy of the energy storage element in the circuit is no longer output externally, but only internally consumed, ultimately achieving the protection effect. Figure 3 This is a simulation diagram of an embodiment of the present invention, as shown below. Figure 3 As shown, the dashed line represents the input voltage, and the solid line represents the output voltage. When the power supply is normally supplying power to the device, the input voltage and output voltage drop are very low, typically equal to the on-resistance of the first MOSFET multiplied by the current consumption, thus meeting the design expectation of low circuit voltage loss. When the input voltage drops rapidly or even reverses, the reverse connection protection circuit of this embodiment can quickly shut down, and the energy stored in the circuit can still power subsequent circuits, thereby achieving the function of protecting the device.

[0044] In one exemplary instance, the reverse power connection protection circuit of this invention can be applied to all devices that require reverse power connection protection, including but not limited to solid-state drives.

[0045] This invention also includes a solid-state drive (SSD) with the aforementioned reverse power connection protection circuit connected to its power supply.

[0046] In this embodiment of the invention, when the input voltage of the reverse power connection protection unit drops rapidly, the reverse power connection protection circuit can promptly determine the transient drop process by comparing the voltage difference between the input and output of the reverse power connection protection unit, thereby improving the working performance of the reverse power connection protection circuit.

[0047] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

Claims

1. A reverse power supply protection circuit, comprising: The system includes a reverse power connection protection unit, a comparison unit, a response unit, and a control unit; among which, The comparison unit includes a first branch and a second branch; wherein, the input terminal of the first branch is connected to the input terminal of the reverse power supply protection unit, and the input terminal of the second branch is connected to the output terminal of the reverse power supply protection unit. The response unit is connected to the output terminals of the first branch and the second branch, and is configured to process energy to ensure that the voltage difference signal between the output terminals of the first branch and the second branch, which is output to the control unit, meets a preset response time. The input terminal of the control unit is connected to the response unit, and the output terminal is connected to the reverse power supply protection unit. It is configured to receive the voltage difference signal from the response unit. When the voltage difference signal is greater than the preset difference threshold, it outputs a control signal to the reverse power supply protection unit to shut off the input voltage.

2. The reverse power connection protection circuit according to claim 1, characterized in that, The reverse power connection protection unit includes: a reverse power connection protection unit comprising a first field-effect transistor Q1; wherein The input terminal of the first branch is connected to the source of the first field-effect transistor Q1, and the input terminal of the second branch is connected to the drain of the first field-effect transistor Q1.

3. The reverse power connection protection circuit according to claim 2, characterized in that: The first branch includes a first resistor R1 and a first diode D1. The first end of the first resistor R1 is connected to the source of the first field-effect transistor, and the second end of the first resistor R1 is connected to the anode of the first diode D1. The second branch includes a second resistor R2 and a second diode D2. The first end of the second resistor R2 is connected to the drain of the first field-effect transistor, and the second end of the second resistor R2 is connected to the anode of the second diode D2. The cathode of the first diode D1 is connected to the cathode of the second diode D2, and then connected to the response unit.

4. The reverse power connection protection circuit according to claim 2, characterized in that, The response unit includes a first capacitor C1, the first end of which is connected to the output terminal of the first branch and the output terminal of the second branch, and the second end of which is grounded.

5. The reverse power connection protection circuit according to claim 4, characterized in that, The control unit includes: a second field-effect transistor Q2 and a third diode D3; wherein... The emitter of the second field-effect transistor Q2 is connected to the first terminal of the first capacitor C1, the base of the second field-effect transistor Q2 is connected to the second terminal of the first resistor R1, the collector of the second field-effect transistor Q2 is connected to the positive terminal of the third diode D3, and the negative terminal of the third diode D3 is connected to the gate of the first field-effect transistor Q1.

6. The reverse power connection protection circuit according to claim 5, characterized in that, The turn-on voltage of the second field-effect transistor Q2 is one of the following values ​​within the voltage range: 0.2 volts to 0.7 volts.

7. The reverse power connection protection circuit according to claim 6, characterized in that, The capacitance value of the first capacitor C1 is positively correlated with the response time.

8. The reverse power supply protection circuit according to any one of claims 2-7, characterized in that, The reverse power connection protection unit also includes a Zener diode D4 and a third resistor R3; wherein... The drain of the first field-effect transistor Q1 is connected to the negative terminal of the Zener diode D4, the gate of the first field-effect transistor Q1 is connected to the negative terminal of the Zener diode D4, the gate of the first field-effect transistor Q1 is connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is grounded.

9. A solid-state drive, characterized in that, The solid-state drive power connection is an anti-reverse power connection circuit as described in any one of claims 1-8.

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