CN-115395497-B - Circuit for preventing reverse connection of power supply and solid state disk

Abstract

The power supply reverse connection preventing circuit comprises a power supply reverse connection preventing unit, a comparing unit, a responding unit and a control unit, wherein the input end of a first branch of the comparing unit is connected with the input end of the power supply reverse connection preventing unit, the input end of a second branch is connected with the output end of the power supply reverse connection preventing unit, the responding unit is connected with the output ends of the first branch and the second branch, energy is stored through the output of the comparing unit, so that a voltage difference value signal output to the control unit meets a preset response duration, the input end of the control unit is connected with the responding unit, and the output end of the control unit is connected with the power supply reverse connection preventing unit, and when the voltage difference value signal is larger than a preset difference value threshold, a control signal for closing input voltage is output to the power supply reverse connection preventing unit. According to the embodiment of the invention, on the basis of the power supply reverse connection preventing circuit, the transient descent process is determined in time by comparing the voltage difference values input and output by the power supply reverse connection preventing unit, so that the working performance of the power supply reverse connection preventing circuit is improved.

Inventors

• ZHU QING
• JIANG HAITAO

Assignees

• 合肥大唐存储科技有限公司

Dates

Publication Date

20260508

Application Date

20220914

Claims (9)

1. 1. The power supply reverse connection preventing circuit comprises a power supply reverse connection preventing unit, a comparing unit, a responding unit and a control unit, The comparing unit comprises a first branch and a second branch, wherein the input end of the first branch is connected with the input end of the power supply reverse connection preventing unit, and the input end of the second branch is connected with the output end of the power supply reverse connection preventing unit; The response unit is connected with the output end of the first branch and the output end of the second branch and is set to enable the voltage difference signals of the output end of the first branch and the output end of the second branch output to the control unit to meet preset response time through energy storage processing; The input end of the control unit is connected with the response unit, the output end of the control unit is connected with the power supply reverse connection preventing unit, the control unit is set to receive the voltage difference signal from the response unit, and when the voltage difference signal is larger than a preset difference threshold value, a control signal for closing the input voltage is output to the power supply reverse connection preventing unit.
2. 2. The power supply reversal prevention circuit according to claim 1, characterized in that the power supply reversal prevention unit comprises a unit for preventing power supply reversal including a first field effect transistor Q1, wherein The input end of the first branch is connected with the source electrode of the first field effect tube Q1, and the input end of the second branch is connected with the drain electrode of the first field effect tube Q1.
3. 3. The reverse power supply circuit of claim 2, wherein: The first branch circuit comprises a first resistor R1 and a first diode D1, wherein a first end of the first resistor R1 is connected with a source electrode of the first field effect transistor, and a second end of the first resistor R1 is connected with an anode of the first diode D1; the second branch circuit comprises a second resistor R2 and a second diode D2, a first end of the second resistor R2 is connected with the drain electrode of the first field effect transistor, and a second end of the second resistor R2 is connected with the anode of the second diode D2; The negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2, and then connected to the response unit.
4. 4. The reverse power supply circuit according to claim 2, wherein the response unit comprises a first capacitor C1, a first end of the first capacitor C1 is connected to the output end of the first branch and the output end of the second branch, and a second end of the first capacitor C1 is grounded.
5. 5. The reverse power supply circuit according to claim 4, wherein the control unit comprises a second FET Q2 and a third diode D3, wherein, The emitter of the second field effect transistor Q2 is connected to the first end of the first capacitor C1, the base of the second field effect transistor Q2 is connected to the second end of the first resistor R1, the collector of the second field effect transistor Q2 is connected to the positive electrode of the third diode D3, and the negative electrode of the third diode D3 is connected to the gate of the first field effect transistor Q1.
6. 6. The reverse power supply preventing circuit according to claim 5, wherein the on voltage of the second fet Q2 is one of the following voltage ranges: 0.2 volts to 0.7 volts.
7. 7. The reverse power supply circuit according to claim 6, wherein a capacitance value of the first capacitor C1 is positively correlated with the response time period.
8. 8. The reverse power supply circuit according to any one of claims 2 to 7, wherein the reverse power supply preventing unit further comprises a zener diode D4 and a third resistor R3, wherein, The drain electrode of the first field effect transistor Q1 is connected with the cathode of the zener diode D4, the gate electrode of the first field effect transistor Q1 is connected with the first end of the third resistor R3, and the second end of the third resistor R3 is grounded.
9. 9. A solid state disk, wherein a power supply of the solid state disk is connected to the reverse power supply connection preventing circuit according to any one of claims 1 to 8.

Description

Circuit for preventing reverse connection of power supply and solid state disk Technical Field The present disclosure relates to power protection technologies, and in particular, to a circuit for preventing reverse connection of power and a solid state disk. Background In Solid State Disk (SSD) technology, there is a type of power supply reverse connection preventing circuit for power supply protection, and it is common practice to use a diode or a field effect transistor (MOS) tube for preventing power supply reverse connection. The diode-based power supply reverse connection preventing circuit cannot realize low line voltage drop loss when realizing power supply reverse connection preventing, and the MOS-tube-based power supply reverse connection preventing circuit can realize low line voltage drop and cannot complete the functional requirements in the transient descent process. How to realize low line voltage drop and meet the functional requirements in the transient descent process of the power supply reverse connection prevention circuit becomes a problem to be solved. Disclosure of Invention The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims. The embodiment of the invention provides a power supply reverse connection preventing circuit and a solid state disk, which can timely determine a transient descent process on the basis of the power supply reverse connection preventing circuit and improve the working performance of the power supply reverse connection preventing circuit. The embodiment of the invention provides a power supply reverse connection preventing circuit which comprises a power supply reverse connection preventing unit, a comparing unit, a responding unit and a control unit, wherein, The comparing unit comprises a first branch and a second branch, wherein the input end of the first branch is connected with the input end of the power supply reverse connection preventing unit, and the input end of the second branch is connected with the output end of the power supply reverse connection preventing unit; The response unit is connected with the output end of the first branch and the output end of the second branch and is set to enable the voltage difference signals of the output end of the first branch and the output end of the second branch output to the control unit to meet preset response time through energy storage processing; The input end of the control unit is connected with the response unit, the output end of the control unit is connected with the power supply reverse connection preventing unit, the control unit is set to receive the voltage difference signal from the response unit, and when the voltage difference signal is larger than a preset difference threshold value, a control signal for closing the input voltage is output to the power supply reverse connection preventing unit. In still another aspect, an embodiment of the present application further provides a solid state hard disk, where a power supply of the solid state hard disk is connected to the above power reverse connection preventing circuit. The power supply reverse connection preventing circuit comprises a power supply reverse connection preventing unit, a comparing unit, a responding unit and a control unit, wherein the comparing unit comprises a first branch and a second branch, the input end of the first branch is connected with the input end of the power supply reverse connection preventing unit, the input end of the second branch is connected with the output end of the power supply reverse connection preventing unit, the responding unit is connected with the output end of the first branch and the output end of the second branch and is set to enable voltage difference signals of the output end of the first branch and the output end of the second branch output to the control unit to meet preset response time through energy storage processing, the input end of the control unit is connected with the responding unit, the output end of the control unit is connected with the power supply reverse connection preventing unit and is set to receive the voltage difference signals from the responding unit, and when the voltage difference signals are larger than a preset difference threshold value, the control signals for closing input voltages are output to the power supply reverse connection preventing unit. According to the embodiment of the application, on the basis of the power supply reverse connection preventing circuit, the transient descent process is determined in time by comparing the voltage difference values input and output by the power supply reverse connection preventing unit, so that the working performance of the power supply reverse connection preventing circuit is improved. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the descripti