Overvoltage protection circuit of NAS (Network Attached Storage) server

Abstract

The utility model discloses an overvoltage protection circuit for an NAS (Network Attached Storage) server, which relates to the technical field of NAS servers and comprises an overvoltage protection chip U1, a filter L1, filter capacitors C1, C2 and C3, sampling divider resistors R1 and R2, resistors R4 and R5 and an MCU (Microprogrammed Control Unit) chip, a DC 12V voltage input end is connected to a fourth pin of an overvoltage protection chip U1 through a filter L1, the fourth pin and a fifth pin of the overvoltage protection chip U1 are connected and are grounded through a filter capacitor C1 and a filter capacitor C2, the fourth pin and the fifth pin of the overvoltage protection chip U1 are connected with a sampling divider resistor R1 and a sampling divider resistor R2 and are grounded, a first pin of the overvoltage protection chip U1 is connected with the sampling divider resistor R1 and the sampling divider resistor R2, and a second pin of the overvoltage protection chip U1 is connected with a second pin of the overvoltage protection chip U1. A third pin of the overvoltage protection chip U1 is grounded through a filter capacitor C3, a second pin of the overvoltage protection chip U1 is grounded through a resistor R4, and the second pin of the overvoltage protection chip U1 is connected with the MCU chip through a resistor R5. According to the utility model, under the condition that a user uses the high-voltage adapter carelessly, the hard disk can be protected, and the hard disk is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of NAS servers, in particular to an overvoltage protection circuit for a NAS server. Background Art

[0002] NAS server (Network Attached Storage), also known as network attached storage, uses the Internet as a carrier to achieve data transmission and storage. Data can be stored on a remote dedicated storage device or on a server.

[0003] NAS server can be connected to the user network through a hub or switch. It is a plug-and-play network device. The server is based on LAN (local area network), communicates according to the TCP / IP protocol, and transmits data in the form of file I / O (input / output). Structurally, NAS is a streamlined computer with a single function, so it is not as complex as a server in terms of architecture. It looks like a home appliance, with only a power supply and simple control buttons. You only need to connect it to the terminal client through a network cable to complete the installation and control of NAS.

[0004] Currently, NAS server products on the market rarely use overvoltage protection for 12V hard drives. When users accidentally use a voltage adapter greater than 12V, such as a 24V adapter, the hard drive may be damaged because it exceeds the working voltage range of 12V. In order to prevent similar problems from occurring and causing subsequent circuit damage, a NAS server overvoltage protection circuit is urgently needed to solve the above problem. Utility Model Content

[0005] The purpose of the embodiments of the present utility model is to provide an overvoltage protection circuit for a NAS server to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A NAS server overvoltage protection circuit, comprising: a DC12V voltage input terminal, an overvoltage protection chip U1, a filter L1, a filter capacitor C1, a filter capacitor C2, a filter capacitor C3, a sampling voltage-dividing resistor R1, a sampling voltage-dividing resistor R2, a resistor R4, a resistor R5 and an MCU chip, wherein the overvoltage protection chip U1 is used to control the resistor R4, the resistor R5 and the MCU chip;

[0008] The DC12V voltage input end is connected to pin 4 of the overvoltage protection chip U1 through the filter L1, pin 4 of the overvoltage protection chip U1 is connected to pin 5, and is grounded through the filter capacitor C1 and the filter capacitor C2, pins 4 and 5 of the overvoltage protection chip U1 are connected to the sampling voltage-dividing resistor R1 and the sampling voltage-dividing resistor R2 and are grounded, pin 1 of the overvoltage protection chip U1 is connected to the sampling voltage-dividing resistor R1 and the sampling voltage-dividing resistor R2, pin 3 of the overvoltage protection chip U1 is the voltage output pin, and is grounded through the filter capacitor C3, pin 2 of the overvoltage protection chip U1 is the enable pin, and is grounded through the resistor R4, and pin 2 of the overvoltage protection chip U1 is connected to the MCU chip through the resistor R5.

[0009] As a further solution of the utility model: when the MCU chip outputs 0V, the overvoltage protection chip U1 does not work, and when the MCU chip outputs 1.8V, the overvoltage protection chip U1 works.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model provides a NAS server overvoltage protection circuit, which can protect the hard disk when the user accidentally uses a high-voltage adapter to avoid damage to the hard disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic diagram of a NAS server overvoltage protection circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] In an embodiment of the utility model, a NAS server overvoltage protection circuit includes: a DC12V voltage input terminal, an overvoltage protection chip U1, a filter L1, a filter capacitor C1, a filter capacitor C2, a filter capacitor C3, a sampling voltage-dividing resistor R1, a sampling voltage-dividing resistor R2, a resistor R4, a resistor R5 and an MCU chip, wherein the overvoltage protection chip U1 is used to control the resistor R4, the resistor R5 and the MCU chip;

[0015] The DC12V voltage input terminal is connected to the 4th pin of the overvoltage protection chip U1 through the filter L1, the 4th pin of the overvoltage protection chip U1 is connected to the 5th pin, and is grounded through the filter capacitor C1 and the filter capacitor C2, the 4th pin and the 5th pin of the overvoltage protection chip U1 are connected to the sampling voltage-dividing resistor R1 and the sampling voltage-dividing resistor R2 and are grounded, the 1st pin of the overvoltage protection chip U1 is connected to the sampling voltage-dividing resistor R1 and the sampling voltage-dividing resistor R2, the 3rd pin of the overvoltage protection chip U1 is the voltage output pin, and is grounded through the filter capacitor C3, the 2nd pin of the overvoltage protection chip U1 is the enable pin, and is grounded through the resistor R4, and the 2nd pin of the overvoltage protection chip U1 is connected to the MCU chip through the resistor R5;

[0016] When the MCU chip outputs 0V, the overvoltage protection chip U1 does not work, and when the MCU chip outputs 1.8V, the overvoltage protection chip U1 works.

[0017] The calculation formula for overvoltage protection is:

[0018] For example: input voltage is 12V, overvoltage protection point is around 13.5V,

[0019] Assume: R1 = 82K (resistance is selected according to common specifications, and can also be set to other resistance values)

[0020] 13.5V=[(82K+R2)x1.25] / R2

[0021] 13.5 / 1.25=(82K+R2) / R2

[0022] R2=82K / 9.8

[0023] R2=8.36K

[0024] Find a resistor with a commonly used specification of about 8.36K. If there is a resistor with a specification of 8.2K, recalculate the overvoltage protection point as 13.75V according to R1=82K and R2=8.2K.

[0025] Resistor selection specifications table 1:

[0026]

[0027] Resistor selection specification table 2:

[0028]

[0029] Voltage determination method;

[0030] 1. Use the test voltage and calculation formula to calculate the theoretical resistance value;

[0031] 2. Based on the resistor selection specification table, determine the actual resistance value, use the formula, recalculate, and determine the target voltage.

[0032] In this implementation, preferably, the upper and lower values ​​of the resistor closest to the calculated theoretical resistance value in the specification table are selected as the actual resistance value;

[0033] Preferably, the absolute value of the difference between the theoretical resistance value and the upper and lower values ​​of the theoretical value is calculated, and the upper value or the lower value corresponding to the smallest absolute value of the difference is taken as the actual resistance value.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A NAS server overvoltage protection circuit, characterized in that: include: DC12V voltage input terminal, overvoltage protection chip U1, filter L1, filter capacitor C1, filter capacitor C2, filter capacitor C3, sampling voltage-dividing resistor R1, sampling voltage-dividing resistor R2, resistor R4, resistor R5 and MCU chip, the overvoltage protection chip U1 is used to control resistor R4, resistor R5 and MCU chip; The DC12V voltage input end is connected to pin 4 of the overvoltage protection chip U1 through the filter L1, pin 4 of the overvoltage protection chip U1 is connected to pin 5, and is grounded through the filter capacitor C1 and the filter capacitor C2, pins 4 and 5 of the overvoltage protection chip U1 are connected to the sampling voltage-dividing resistor R1 and the sampling voltage-dividing resistor R2 and are grounded, pin 1 of the overvoltage protection chip U1 is connected to the sampling voltage-dividing resistor R1 and the sampling voltage-dividing resistor R2, pin 3 of the overvoltage protection chip U1 is the voltage output pin, and is grounded through the filter capacitor C3, pin 2 of the overvoltage protection chip U1 is the enable pin, and is grounded through the resistor R4, and pin 2 of the overvoltage protection chip U1 is connected to the MCU chip through the resistor R5.

2. The NAS server overvoltage protection circuit according to claim 1, characterized in that: When the MCU chip outputs 0V, the overvoltage protection chip U1 does not work, and when the MCU chip outputs 1.8V, the overvoltage protection chip U1 works.

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