Computer information security protection circuit

Abstract

The utility model relates to the field of computer information security, in particular to a computer information security protection circuit which comprises a chip U2, a capacitor C1, an MOS tube Q1 and a chip U2, a third pin of the chip U2 is connected with one end of an R1, the other end of the R1 is connected with a power supply VCC, and the VCC is connected with a computer internal power supply circuit; a first pin of the chip U2 is connected to a grid electrode pin of the MOS tube Q1, a source electrode pin of the MOS tube Q1 is connected with an anode of the capacitor C1, the anode of the capacitor C1 is connected with a cathode of the diode D2, and an anode of the diode D2 is connected with VCC; the drain electrode pin of the MOS tube Q1 is connected with the first pin of the chip U3. And a No.3 pin of the chip U3 is connected with a power supply output end. The capacitor is used as an energy storage element, so that electric energy can be instantly released, and the response speed is high; compared with a battery serving as an energy storage element, the service life is longer, and maintenance is avoided; the circuit is simple in structure and few in components, and can be directly connected into a computer; and after power failure is identified, the buzzer BUZZER gives an alarm to prompt a user to store key information.

Description

Technical Field

[0001] This utility model relates to the field of computer information security, and in particular to a computer information security protection circuit. Background Technology

[0002] As core information processing devices, computers rely heavily on their CPUs for data storage and computation. However, traditional desktop computers generally lack backup power supplies, exhibiting a significant design flaw. These devices depend entirely on 220V AC mains power. When encountering voltage fluctuations or sudden power outages, the fuse will trip, forcing a shutdown. This can easily lead to data loss, file corruption, and other problems, causing significant losses for users.

[0003] To address this issue, utility model patent CN 205959159 U discloses a computer power-off protection control circuit, comprising a resistor R3, a capacitor C4, a chip IC1, and a diode D3. One end of the resistor R3 is connected to the capacitor C4 and a 220V AC power supply. The other end of the capacitor C4 is connected to the other end of the resistor R3, a transient voltage suppression diode DW, and port 1 of the rectifier bridge T. Port 3 of the rectifier bridge T is connected to the other end of the transient voltage suppression diode DW and the other end of the 220V AC power supply. This utility model computer power-off protection control circuit has a simple structure and few components. Utilizing a dual power supply of mains voltage and a battery, it effectively solves the problem of computer CPU damage due to sudden power outages. Furthermore, the battery in the circuit does not discharge under normal conditions, thus offering advantages such as long service life, good protection effect, and ease of use.

[0004] However, in this patent: the battery will have a delay because the chemical reaction takes a certain amount of time from start-up to discharge, which may not be able to meet the need for immediate power supply after the computer is powered off; the battery has a limited cycle life and may self-discharge and fail if not used for a long time, so it needs to be replaced regularly; in addition, the circuit in the patent is connected to the 220V mains voltage, which cannot be integrated into the computer, making it inconvenient to use; and it cannot issue an alarm to prompt the user to store critical information after the computer is powered off.

[0005] Therefore, it is necessary to further improve the computer information security protection circuit. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the existing defects and provide a computer information security protection circuit that uses a capacitor as an energy storage element, which can release electrical energy instantly and has a fast response speed; compared with batteries as energy storage elements, it has a longer life and is maintenance-free; the circuit structure is simple, has few components, and can be directly connected to the computer; after power failure is detected, a buzzer alarm prompts the user to store key information, which can effectively solve the problems in the background technology.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a computer information security protection circuit, including chip U2, capacitor C1, MOSFET Q1, chip U2, pin 3 of chip U2 is connected to one end of R1, the other end of R1 is connected to power supply VCC, and VCC is connected to the internal power supply circuit of the computer.

[0008] Pin 1 of chip U2 is connected to the gate pin of MOSFET Q1. The source pin of MOSFET Q1 is connected to the anode of capacitor C1. The cathode of capacitor C1 is connected to GND. The anode of capacitor C1 is connected to the cathode of diode D2. The anode of diode D2 is connected to VCC.

[0009] The drain pin of MOSFET Q1 is connected to pin 1 of chip U3;

[0010] Pin 3 of chip U3 is connected to the power output terminal.

[0011] Preferably, pin 2 of chip U2 is connected to the adjustment terminal of adjustable resistor R4, adjustable resistor R4 is connected between VCC and GND, pin 4 of chip U2 is connected to GND, pin 1 of chip U2 is connected to one end of resistor R3, and the other end of resistor R3 is connected to VCC.

[0012] Preferably, a buzzer is connected between the drain pin of the MOS transistor Q1 and pin 1 of the chip U3, the drain pin of the MOS transistor Q1 is connected to the anode of the buzzer, and the cathode of the buzzer is connected to pin 1 of the chip U3.

[0013] Preferably, pin 1 of chip U3 is connected to one end of inductor L1, the other end of inductor L1 is connected to pin 8 of chip U3, pin 8 of chip U3 is connected to pin 7 of chip U3, and pin 6 of chip U3 is connected to GND.

[0014] Preferably, pin 3 of chip U3 is connected to one end of resistor R5, the other end of resistor R5 is connected to one end of resistor R6, the other end of resistor R6 is connected to GND, and pin 5 of chip U3 is connected between resistor R5 and resistor R6.

[0015] Preferably, pin 3 of chip U3 is connected to the anode of capacitor C2, and the cathode of capacitor C2 is connected to GND; pin 1 of chip U3 is connected to the anode of capacitor C3, and the cathode of capacitor C2 is connected to GND.

[0016] The working principle and usage principle of this utility model are as follows: When the computer is powered, VCC is connected to the internal power supply circuit of the computer to obtain 12V voltage. The potential of pin 2 of chip U2 is lower than that of pin 3 of chip U2, so that MOS transistor Q1 is cut off. The anode potential of diode D2 is higher than that of cathode, so diode D2 is turned on and capacitor C1 is charged. When capacitor C1 is fully charged, the unidirectional conduction of diode D2 prevents capacitor C1 from discharging.

[0017] When the computer is powered off, the anode potential of diode D2 is lower than that of the cathode, so diode D2 is cut off. Chip U2 outputs a low level, which turns on MOSFET Q1, discharges capacitor C1, and current flows through the buzzer, enabling the circuit to perform an alarm function and remind the user that the computer has been powered off. Chip U3 inputs a high level, which is processed and output to the computer's internal components that require power.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] Using capacitors as energy storage elements allows for the release of electrical energy almost instantaneously, resulting in a fast response speed.

[0020] It can be charged and discharged hundreds of thousands of times, has no memory effect, has a lifespan far exceeding that of battery energy storage components, and requires no maintenance;

[0021] The circuit structure is simple, with few components, and can be directly connected to the computer, making it easy to use.

[0022] The buzzer alarm function, which detects power outages, has the advantage of allowing users to understand the situation and promptly store critical information in the computer. Attached Figure Description

[0023] Figure 1 This is the protection circuit diagram of this utility model. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of the embodiments of this application easier to understand, the embodiments of this application are further described below in conjunction with the figures and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of this application and are not intended to limit the embodiments of this application.

[0025] Please see Figure 1 This utility model provides a technical solution: a computer information security protection circuit, including chip U2, capacitor C1, MOSFET Q1, chip U2, pin 3 of chip U2 is connected to one end of R1, the other end of R1 is connected to power supply VCC, and VCC is connected to the internal power supply circuit of the computer.

[0026] Pin 1 of chip U2 is connected to the gate pin of MOSFET Q1. The source pin of MOSFET Q1 is connected to the anode of capacitor C1. The cathode of capacitor C1 is connected to GND. The anode of capacitor C1 is connected to the cathode of diode D2. The anode of diode D2 is connected to VCC.

[0027] The drain pin of MOSFET Q1 is connected to pin 1 of chip U3;

[0028] Pin 3 of chip U3 is connected to the power output terminal.

[0029] Specifically, chip U2 is model LM393; chip U3 is model XL6109; MOSFET Q1 is model IRF540NPBF; capacitor C1 is model Maxwell K2;

[0030] When the computer is powered, VCC connects to the internal power supply circuit of the computer to obtain 12V voltage. Chip U2 outputs a high level, which makes MOSFET Q1 turn off. The anode potential of diode D2 is higher than that of cathode, so diode D2 conducts and capacitor C1 is charged. When capacitor C1 is fully charged, the unidirectional conduction of diode D2 prevents capacitor C1 from discharging.

[0031] When the computer is powered off, the anode potential of diode D2 is lower than that of the cathode, so diode D2 is cut off. Chip U2 outputs a low level, which turns on MOSFET Q1. Capacitor C1 discharges and inputs to chip U3. After being processed by chip U3, it is output to the computer's internal components that require power.

[0032] Furthermore, pin 2 of chip U2 is connected to the adjustment terminal of adjustable resistor R4, which is connected between VCC and GND. Pin 4 of chip U2 is connected to GND, and pin 1 of chip U2 is connected to one end of resistor R3, with the other end of resistor R3 connected to VCC.

[0033] Specifically, when there is a power input, the potential of pin 2 of chip U2 is lower than that of pin 3 of chip U2, and chip U2 outputs a high level.

[0034] Furthermore, a buzzer is connected between the drain pin of MOSFET Q1 and pin 1 of chip U3. The drain pin of MOSFET Q1 is connected to the anode of the buzzer, and the cathode of the buzzer is connected to pin 1 of chip U3.

[0035] Specifically, when the computer is powered off, MOSFET Q1 turns on, capacitor C1 discharges, and current flows through the buzzer to enable the circuit to perform an alarm function, indicating to the user that the computer has been powered off.

[0036] Furthermore, pin 1 of chip U3 is connected to one end of inductor L1, the other end of inductor L1 is connected to pin 8 of chip U3, pin 8 of chip U3 is connected to pin 7 of chip U3, and pin 6 of chip U3 is connected to GND.

[0037] Pin 3 of chip U3 is connected to one end of resistor R5, the other end of resistor R5 is connected to one end of resistor R6, the other end of resistor R6 is connected to GND, and pin 5 of chip U3 is connected between resistor R5 and resistor R6.

[0038] Specifically, when the computer is powered off, MOSFET Q1 is turned on, and capacitor C1 discharges and inputs to chip U3. This circuit connection allows chip U3 to stably output 12V voltage regardless of whether the input voltage is higher or lower than the output voltage, thus addressing capacitor voltage attenuation, significantly reducing energy loss, and extending the capacitor's power supply time.

[0039] Furthermore, pin 3 of chip U3 is connected to the anode of capacitor C2, and the cathode of capacitor C2 is connected to GND; pin 1 of chip U3 is connected to the anode of capacitor C3, and the cathode of capacitor C2 is connected to GND.

[0040] Specifically, the parallel capacitor C2 can share the instantaneous current and reduce voltage fluctuations. If the computer suddenly starts up, the current demand of high-power components will increase sharply. At this time, the parallel capacitor C3 can cope with the instantaneous load response. The switching frequency of the chip U3 will generate high-frequency ripple. At this time, the parallel capacitor C3 can filter out high-frequency noise.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A computer information security protection circuit, comprising chip U2, capacitor C1, MOSFET Q1, and chip U2, characterized in that: Pin 3 of chip U2 is connected to one end of R1, and the other end of R1 is connected to power supply VCC, which is connected to the internal power supply circuit of the computer. Pin 1 of chip U2 is connected to the gate pin of MOSFET Q1. The source pin of MOSFET Q1 is connected to the anode of capacitor C1. The cathode of capacitor C1 is connected to GND. The anode of capacitor C1 is connected to the cathode of diode D2. The anode of diode D2 is connected to VCC. The drain pin of MOSFET Q1 is connected to pin 1 of chip U3; Pin 3 of chip U3 is connected to the power output terminal.

2. The computer information security protection circuit according to claim 1, characterized in that: Pin 2 of chip U2 is connected to the adjustment terminal of adjustable resistor R4, which is connected between VCC and GND. Pin 4 of chip U2 is connected to GND. Pin 1 of chip U2 is connected to one end of resistor R3, and the other end of resistor R3 is connected to VCC.

3. The computer information security protection circuit according to claim 1, characterized in that: A buzzer is connected between the drain pin of the MOSFET Q1 and pin 1 of the chip U3. The drain pin of the MOSFET Q1 is connected to the anode of the buzzer, and the cathode of the buzzer is connected to pin 1 of the chip U3.

4. A computer information security protection circuit according to claim 1 or 2, characterized in that: Pin 1 of chip U3 is connected to one end of inductor L1, the other end of inductor L1 is connected to pin 8 of chip U3, pin 8 of chip U3 is connected to pin 7 of chip U3, and pin 6 of chip U3 is connected to GND.

5. A computer information security protection circuit according to claim 1, characterized in that: Pin 3 of chip U3 is connected to one end of resistor R5, the other end of resistor R5 is connected to one end of resistor R6, the other end of resistor R6 is connected to GND, and pin 5 of chip U3 is connected between resistor R5 and resistor R6.

6. The computer information security protection circuit according to claim 1, characterized in that: Pin 3 of chip U3 is connected to the anode of capacitor C2, and the cathode of capacitor C2 is connected to GND; pin 1 of chip U3 is connected to the anode of capacitor C3, and the cathode of capacitor C2 is connected to GND.

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