Clock interface circuit of video monitoring server

Abstract

The utility model discloses a clock interface circuit of a video monitoring server, which relates to the field of electronic information and comprises a 3.3 V step-down circuit used for outputting 3.3 V direct-current voltage to a power supply selection circuit; the power supply selection circuit is used for selecting the 3.3 V step-down circuit or the button battery as a power supply, the 3.3 V step-down circuit is used as a first power supply, the button battery is used as a second power supply, and the 3.3 V step-down circuit is preferentially selected to supply power; the clock circuit is used for storing system time by adopting an internal crystal oscillator timer and ensuring normal operation of functions of the video monitoring server; and the level conversion circuit is used for converting a 3.3 V signal of the clock chip into a 1.8 V signal. The beneficial effects of the utility model are that the 3.3 V step-down circuit and the button cell are matched to supply power, so that power utilization is ensured; and by adopting the low-power-consumption clock chip, the use power consumption is reduced, and the use requirement is met.

Description

Technical Field

[0001] The utility model relates to the field of electronic information, and particularly to a clock interface circuit of a video surveillance server. Background Technique

[0002] The main function of the server is video recording. The network camera collects video surveillance data and transmits it to the video surveillance server through the Ethernet cable for recording and storage. It can be connected to an external authorized terminal through the service interface of the video surveillance server to view the image screen and download video data.

[0003] According to the on-site functional requirements, the battery powered by the RTC (clock circuit) needs to be used for no less than 6 years. However, the RTC built in the CPU has a high power consumption and cannot meet this requirement, so improvement is needed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a clock interface circuit of a video surveillance server to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A clock interface circuit of a video surveillance server, comprising:

[0007] A 3.3V step-down circuit for outputting a 3.3V DC voltage to supply the power selection circuit;

[0008] A power selection circuit for selecting the 3.3V step-down circuit or the button battery as the power supply. The 3.3V step-down circuit is the first power supply, and the button battery is the second power supply. The 3.3V step-down circuit is preferentially selected for power supply;

[0009] A clock circuit for using an internal crystal oscillator timer to save the system time and ensure the normal operation of the video surveillance server function;

[0010] A level conversion circuit for converting the 3.3V signal of the clock chip into a 1.8V signal to reduce the power consumption;

[0011] The 3.3V step-down circuit is connected to the power selection circuit, the power selection circuit is connected to the clock circuit, and the clock circuit is connected to the level conversion circuit.

[0012] As a further solution of the present utility model: The 3.3V step-down circuit includes a chip U20, the model of the chip U20 is TPS565208DDCR. The 3rd pin of the chip U20 introduces a 12V voltage, the 5th pin of the chip U20 introduces a control signal through a resistor R97. The 2nd pin of the chip U20 is connected to one end of a capacitor C122 and one end of an inductor L4. The other end of the capacitor C122 is grounded, and the other end of the inductor L4 is connected to one end of a resistor R98, one end of a capacitor C126. The other end of the resistor R98 is connected to one end of a resistor R100 and the 4th pin of the chip U20. The other end of the resistor R100 is grounded, and the other end of the capacitor C126 is grounded.

[0013] As a further solution of the present utility model: The power supply selection circuit includes a diode group D1. The diode group D1 is composed of two diodes in parallel, and the model is BAT54C. The first end of the diode group D1 is connected to the positive electrode of a button battery BT1, the negative electrode of the button battery BT1 is grounded. The second end of the diode group D1 is connected to the 3.3V step-down circuit, and the third end of the diode group D1 is connected to one end of a capacitor C12 and the clock circuit. The other end of the capacitor C12 is grounded.

[0014] As a further solution of the present utility model: The clock circuit includes a chip U3, the model of the chip U3 is RX8010SJ. The 8th pin of the chip U3 is connected to the power supply selection circuit through a resistor R10, and the 5th and 6th pins of the chip U3 are connected to the level conversion circuit.

[0015] As a further solution of the present utility model: The level conversion circuit includes a chip U2, the model of the chip U2 is LSFO102DCTR. The 5th pin of the chip U2 is connected to one end of a resistor R4 and the clock circuit. The other end of the resistor R4 is connected to a 3.3V voltage. The 6th pin of the chip U2 is connected to one end of a resistor R5 and the clock circuit. The other end of the resistor R5 is connected to a 3.3V voltage. The 3rd pin of the chip U2 is connected to one end of a resistor R7, and the other end of the resistor R7 is connected to a 1.8V voltage. The 4th pin of the chip U2 is connected to one end of a resistor R6, and the other end of the resistor R6 is connected to a 1.8V voltage. The 3rd and 4th pins of the chip U2 output a clock signal to the video surveillance server.

[0016] Compared with the prior art, the beneficial effects of the present utility model are: The present utility model ensures power supply by setting the 3.3V step-down circuit and the button battery in combination. The level conversion circuit reduces the power consumption by using a low-power clock chip, meeting the usage requirements. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the clock interface circuit of a video surveillance server.

[0018] Figure 2Circuit diagram of a 3.3V step-down circuit.

[0019] Figure 3 Circuit diagram of a power supply selection circuit.

[0020] Figure 4 Circuit diagram of a clock circuit.

[0021] Figure 5 Circuit diagram of a level conversion circuit. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figure 1 , a clock interface circuit of a video surveillance server, including:

[0024] A 3.3V step-down circuit for outputting a 3.3V DC voltage to supply the power supply selection circuit;

[0025] A power supply selection circuit for selecting either the 3.3V step-down circuit or a button battery as the power supply. The 3.3V step-down circuit is the first power supply, and the button battery is the second power supply. The 3.3V step-down circuit is preferably selected for power supply;

[0026] A clock circuit for using an internal crystal oscillator timer to save the system time and ensure the normal operation of the video surveillance server function;

[0027] A level conversion circuit for converting the 3.3V signal of the clock chip into a 1.8V signal to reduce power consumption;

[0028] The 3.3V step-down circuit is connected to the power supply selection circuit, the power supply selection circuit is connected to the clock circuit, and the clock circuit is connected to the level conversion circuit.

[0029] In this embodiment: Please refer to Figure 2, The 3.3V step-down circuit includes chip U20, whose model is TPS565208DDCR. A 12V voltage is introduced to the 3rd pin of chip U20, and a control signal is introduced to the 5th pin of chip U20 through resistor R97. The 2nd pin of chip U20 is connected to one end of capacitor C122 and one end of inductor L4. The other end of capacitor C122 is grounded. The other end of inductor L4 is connected to one end of resistor R98, one end of capacitor C126. The other end of resistor R98 is connected to one end of resistor R100 and the 4th pin of chip U20. The other end of resistor R100 is grounded, and the other end of capacitor C126 is grounded.

[0030] Through level converter U20, the 12V DC power is converted into 3.3V DC power to supply the subsequent circuit.

[0031] In this embodiment: Please refer to Figure 3 , The power supply selection circuit includes diode group D1, which is composed of two diodes in parallel, with the model of BAT54C. The first end of diode group D1 is connected to the positive pole of button battery BT1, the negative pole of button battery BT1 is grounded, the second end of diode group D1 is connected to the 3.3V step-down circuit, and the third end of diode group D1 is connected to one end of capacitor C12 and the clock circuit. The other end of capacitor C12 is grounded.

[0032] When the 3.3V step-down circuit supplies power, it directly supplies power to the clock circuit, and at this time, button battery BT1 does not supply power. When the 3.3V step-down circuit stops supplying power, button battery BT1 supplies power to ensure continuous power supply to the clock circuit.

[0033] In this embodiment: Please refer to Figure 4 , The clock circuit includes chip U3, whose model is RX8010SJ. The 8th pin of chip U3 is connected to the power supply selection circuit through resistor R10, and the 5th and 6th pins of chip U3 are connected to the level conversion circuit.

[0034] RX8010SJ uses an internal crystal oscillator timer to save the system time to ensure the normal operation of the video surveillance server function.

[0035] In this embodiment: Please refer to Figure 5, the level conversion circuit includes chip U2, the model of chip U2 is LSFO102DCTR. The 5th pin of chip U2 is connected to one end of resistor R4 and the clock circuit, the other end of resistor R4 is connected to 3.3V voltage. The 6th pin of chip U2 is connected to one end of resistor R5 and the clock circuit, the other end of resistor R5 is connected to 3.3V voltage. The 3rd pin of chip U2 is connected to one end of resistor R7, the other end of resistor R7 is connected to 1.8V voltage. The 4th pin of chip U2 is connected to one end of resistor R6, the other end of resistor R6 is connected to 1.8V voltage. The 3rd and 4th pins of chip U2 output clock signals to the video surveillance server.

[0036] By setting chip U2, the 3.3V signal of the clock signal is converted into a 1.8V signal and output to the video surveillance server, reducing the power consumption during use.

[0037] The working principle of the present utility model is as follows: The 3.3V step-down circuit is used to output a 3.3V DC voltage to supply the power selection circuit; the power selection circuit is used to select the 3.3V step-down circuit or the button battery as the power supply. The 3.3V step-down circuit is the first power supply, and the button battery is the second power supply. The 3.3V step-down circuit is preferably selected for power supply; the clock circuit is used to save the system time by using an internal crystal oscillator timer to ensure the normal operation of the functions of the video surveillance server; the level conversion circuit is used to convert the 3.3V signal of the clock chip into a 1.8V signal, reducing the power consumption during use.

[0038] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive.

[0039] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A clock interface circuit for a video surveillance server, characterized in that: The clock interface circuit of the video surveillance server includes: 3.3V step-down circuit, used for outputting 3.3V DC voltage to supply power selection circuit; A power supply selection circuit is used to select a 3.3V step-down circuit or a button battery as a power supply, the 3.3V step-down circuit is a first power supply, the button battery is a second power supply, and the 3.3V step-down circuit is preferentially selected for power supply; The clock circuit is used to save the system time using an internal crystal oscillator timer to ensure the normal operation of the video surveillance server; The level conversion circuit is used to convert the 3.3V signal of the clock chip into a 1.8V signal to reduce power consumption; The 3.3V step-down circuit is connected to the power selection circuit, the power selection circuit is connected to the clock circuit, and the clock circuit is connected to the level conversion circuit.

2. The clock interface circuit of the video surveillance server according to claim 1, characterized in that: The 3.3V step-down circuit includes chip U20. The model of chip U20 is TPS565208DDCR. Pin 3 of chip U20 introduces 12V voltage. Pin 5 of chip U20 introduces control signal through resistor R97. Pin 2 of chip U20 is connected to one end of capacitor C122 and one end of inductor L4. The other end of capacitor C122 is grounded. The other end of inductor L4 is connected to one end of resistor R98, one end of capacitor C126, the other end of resistor R98 is connected to one end of resistor R100 and pin 4 of chip U20. The other end of resistor R100 is grounded. The other end of capacitor C126 is grounded.

3. The clock interface circuit of the video surveillance server according to claim 1, characterized in that: The power selection circuit includes a diode group D1, which is composed of two diodes in parallel, model BAT54C. The first end of the diode group D1 is connected to the positive electrode of the button battery BT1, the negative electrode of the button battery BT1 is grounded, the second end of the diode group D1 is connected to the 3.3V step-down circuit, the third end of the diode group D1 is connected to one end of the capacitor C12 and the clock circuit, and the other end of the capacitor C12 is grounded.

4. The clock interface circuit of the video surveillance server according to claim 1, characterized in that: The clock circuit includes a chip U3, the model of the chip U3 is RX8010SJ, the pin 8 of the chip U3 is connected to the power selection circuit through a resistor R10, and the pins 5 and 6 of the chip U3 are connected to the level conversion circuit.

5. The clock interface circuit of the video surveillance server according to claim 4, characterized in that: The level conversion circuit includes chip U2. The model of chip U2 is LSFO102DCTR. Pin 5 of chip U2 is connected to one end of resistor R4 and the clock circuit, and the other end of resistor R4 is connected to a 3.3V voltage. Pin 6 of chip U2 is connected to one end of resistor R5 and the clock circuit, and the other end of resistor R5 is connected to a 3.3V voltage. Pin 3 of chip U2 is connected to one end of resistor R7, and the other end of resistor R7 is connected to a 1.8V voltage. Pin 4 of chip U2 is connected to one end of resistor R6, and the other end of resistor R6 is connected to a 1.8V voltage. Pins 3 and 4 of chip U2 output clock signals to the video surveillance server.

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