Power supply of server monitoring board card

Abstract

The utility model relates to the technical field of servers, in particular to a power supply of a server monitoring board card, which comprises a first direct-current power supply, a second direct-current power supply and a standby power supply. The first direct-current power supply and the second direct-current power supply are electrically connected with the first end of the power supply line. The second end of the power supply line is electrically connected with a load. The standby power supply is electrically connected with the source electrode of the first PMOS transistor, the drain electrode of the first PMOS transistor is electrically connected with the drain electrode of the second PMOS transistor, and the source electrode of the second PMOS transistor is electrically connected with the first end of the power supply circuit; the first direct-current power supply is electrically connected with the input end of the first diode, the second direct-current power supply is electrically connected with the input end of the second diode, the output ends of the first diode and the second diode are electrically connected with the first end of the resistor, and the second end of the resistor is grounded; the first end of the resistor is electrically connected with the grid electrode of the first PMOS tube and the grid electrode of the second PMOS tube. According to the utility model, stable power supply can be provided for the monitoring board card in various scenes.

Description

Technical Field

[0001] The utility model belongs to the technical field of servers, and in particular relates to a power supply for a server monitoring board. Background Art

[0002] A server is a computer device that is used to process and store various data, information and services. Due to its high performance, it is widely used in data centers, cloud computing, enterprise storage, industrial control and other fields. However, servers have strict requirements on transportation, storage and working environment. Therefore, a board with the function of monitoring the environment of server transportation, storage, racking and operation throughout its life cycle has emerged. This monitoring board has the function of alarming for abnormal temperature, humidity, vibration and air pressure.

[0003] Since the application scenarios of monitoring boards are quite varied, it may be necessary to power on the monitoring board when the server is not powered on, so the power on and off status of the monitoring board and the server are not synchronized. How to provide a flexible and stable power supply for the monitoring board is a technical problem that needs to be solved. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a power supply for a server monitoring board to solve the above-mentioned technical problems.

[0005] The utility model provides a power supply for a server monitoring board, comprising:

[0006] A first DC power supply, a second DC power supply and a backup power supply;

[0007] One end of the first DC power source and one end of the second DC power source are both electrically connected to a first end of a power supply line, and a second end of the power supply line is electrically connected to a load;

[0008] The backup power supply is electrically connected to the source of the first PMOS tube, the drain of the first PMOS tube is electrically connected to the drain of the second PMOS tube, and the source of the second PMOS tube is electrically connected to the first end of the power supply circuit;

[0009] Another path of the first DC power supply is connected to the input end of the first diode, another path of the second DC power supply is connected to the input end of the second diode, the output end of the first diode and the output end of the second diode are both electrically connected to the gate of the first PMOS tube and the gate of the second PMOS tube; the gate of the first PMOS tube and the gate of the second PMOS tube are both electrically connected to the grounding resistor.

[0010] In an optional implementation, the first DC power supply is a mainboard power supply with a voltage of 3.3V, and the first DC power supply is electrically connected to the first end of the power supply circuit via a third diode.

[0011] In an optional implementation, the second DC power supply is electrically connected to the first end of the power supply circuit via a fourth diode.

[0012] In an optional implementation, the second DC power supply is a 5V USB power supply; the second DC power supply is connected to the fourth diode via a DC step-down circuit.

[0013] In an optional implementation, the DC step-down circuit is a BUCK circuit.

[0014] In an optional embodiment, the load includes a sensor and a chip.

[0015] In an optional implementation, the middle node of the power supply line is electrically connected to a filter capacitor, and the filter capacitor is grounded; the second end of the power supply line is connected to a plurality of parallel load branches.

[0016] In an optional embodiment, the backup power supply is electrically connected to one end of the analog switch, the other end of the analog switch is electrically connected to the input end of the fifth diode, and the output end of the fifth diode is electrically connected to the first end of the power supply line.

[0017] In an optional implementation, a voltage sensor is provided on the power supply line, and the voltage sensor is electrically connected to a controller, and the controller is used to control the on / off state of the analog switch.

[0018] The beneficial effect of the utility model is that the power supply of the server monitoring board provided by the utility model adopts three DC power supplies and can be suitable for a variety of application scenarios. In addition, the circuit structure of the power supply can solve the problem that when the backup power supply is supplied, the voltage drop to the load end is too large and the battery power cannot be fully utilized; it can also avoid battery leakage or reverse charging.

[0019] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 The utility model is a schematic diagram of a power supply of a server monitoring board according to an embodiment of the utility model.

[0022] Figure 2 This is another schematic diagram of the power supply of the server monitoring board in one embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] In order to facilitate the understanding of the present invention, the power supply of the server monitoring board provided by the present invention is further described below based on the principle of the power supply of the server monitoring board of the present invention and in combination with the embodiments.

[0026] For details, please refer to Figure 1 , based on the application scenario of the monitoring board. Three DC power supplies are selected as optional power supplies. Specifically, power supply 1 is the 3.3V power supply for the motherboard (P3V3_MAIN), which is used when the server is powered on and starts working; power supply 2 is the 5V USB power supply (P5V_USB). 5V USB power supply is used when the server itself is not powered on and it is necessary to know the alarm situation and connect the monitoring board to a laptop or other terminal through a USB cable; power supply 3 is the 3.3V battery power supply (P3V3_BAT). The battery power supply is used when the server itself is not powered on, that is, during the server storage and transportation process.

[0027] The power supply of the server monitoring board includes:

[0028] A first DC power supply, a second DC power supply and a backup power supply; wherein the backup power supply is a battery, the output voltage of the battery is 3.3V, denoted by P3V3_BAT; the first DC power supply is a mainboard power supply, the voltage is 3.3V, denoted by P3V3_MAIN; the second DC power supply is a 5V USB power supply, denoted by P5V_USB.

[0029] The first DC power source P3V3_MAIN and the second DC power source P5V_USB are both electrically connected to the first end of the power supply circuit ( Figure 1 The node of winning bid 1), the second end of the power supply line ( Figure 1The node of the winning bid 2) is electrically connected to the load; the backup power supply P3V3_BAT is electrically connected to the source of the first PMOS tube, the drain of the first PMOS tube Q1 is electrically connected to the drain of the second PMOS tube Q2, and the source of the second PMOS tube Q2 is electrically connected to the first end of the power supply line; the first DC power supply P3V3_MAIN is electrically connected to the input end of the first diode D1, the second DC power supply P5V_USB is electrically connected to the input end of the second diode D2, the output end of the first diode D1 and the output end of the second diode D2 are both electrically connected to the gate of the first PMOS tube Q1 and the gate of the second PMOS tube Q2; the gate of the first PMOS tube Q1 and the gate of the second PMOS tube Q2 are both electrically connected to the grounding resistor R.

[0030] The output voltage of the second end of the power supply line is 3.3V, represented by P3V3. The second end of the power supply line is connected to the load on the monitoring board, and the load includes multiple sensors and chips. When there are multiple loads, the second end of the power supply line is connected to multiple parallel load branches to supply power to multiple loads on the monitoring board at the same time.

[0031] Since the voltage of the second DC power source P5V_USB is 5V, the voltage needs to be reduced to 3.3V. Therefore, the second DC power source P5V_USB is connected to a DC buck circuit (DCDC), and the DC buck circuit (DCDC) can use a DC buck chip or a BUCK circuit.

[0032] To avoid reverse leakage current, the first DC power source P3V3_MAIN is electrically connected to the first end of the power supply circuit via the third diode D3; the second DC power source P5V_USB is electrically connected to the first end of the power supply circuit via the fourth diode D4.

[0033] The server motherboard power supply P3V3_MAIN is connected to the load power supply P3V3 through diode D3, and the other way is connected to the gate of Q1 through diode D1; the USB power supply network P5V_USB is connected to the gate of Q1 through diode D2, and the other way is converted to P3V3_USB through the DCDC power conversion chip, and then passes through diode D4 to supply power to loads such as sensors. After the P3V3 voltage is filtered by capacitor C1, it supplies power to ICs such as sensors.

[0034] When the first DC power supply P3V3_MAIN or the second DC power supply P5V_USB is powered, the gates of the first PMOS tube Q1 and the second PMOS tube Q2 are at a high level, which is equal to the source voltage of the second PMOS tube Q2. Therefore, Vgs=0v, the first PMOS tube Q1 and the second PMOS tube Q2 are turned off, and the battery stops supplying power to the load circuit. Due to the reverse cutoff effect of the first PMOS tube Q1, the battery will not leak electricity to the load end P3V3 line; due to the reverse cutoff effect of the second PMOS tube Q2, no current will flow into the battery at the load end P3V3, and reverse charging will not be formed, thereby damaging the battery.

[0035] When the first DC power supply P3V3_MAIN and the second DC power supply P5V_USB have no power, the gates of the first PMOS tube Q1 and the second PMOS tube Q2 are at zero level, Vgs=-P3V3_BAT, and both MOS tubes are turned on. When the PMOS tube is turned on, the resistance Rds(on) between its drain and source is several ohms, multiplied by the maximum on-current 2ma, reaching the load end, the battery reduces the voltage drop by several mV, which is much less than 0.5V, thereby improving the battery power utilization.

[0036] The PMOS tube has a threshold voltage. The smaller the threshold voltage, the easier it is for the PMOS tube to turn on. The faster the circuit switches automatically.

[0037] The smaller the resistance R between the G level and GND of the PMOS tube, the faster the PMOS tube conducts. However, due to the power consumption problem of R2, it cannot be too small. If it is too small, the system will waste a lot of extra power consumption.

[0038] The capacitor C at the P3V3 end of the power supply line should generally be selected to be above 100uf. The larger the capacitance, the more electricity can be stored, which will make the seamless switching more stable.

[0039] The greater the load power consumption, the more likely it is that the switching voltage will drop, which may cause the system to reset. Therefore, when the voltage drops, the backup power supply is enabled. The specific structure is as follows Figure 2 As shown, it includes: the backup power supply is electrically connected to one end of the analog switch S, the other end of the analog switch S is electrically connected to the input end of the fifth diode D5, and the output end of the fifth diode D5 is electrically connected to the first end of the power supply line. A voltage sensor is provided on the power supply line, and the voltage sensor is electrically connected to the controller, and the controller is used to control the on-off state of the analog switch. When the voltage sensor detects a voltage drop, the controller controls the analog switch S to close and enable the backup power supply; when the voltage sensor detects that the voltage is normal, the controller controls the analog switch S to open.

[0040] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A power supply for a server monitoring board, characterized in that: include: A first DC power supply, a second DC power supply and a backup power supply; One end of the first DC power supply and one end of the second DC power supply are both electrically connected to a first end of a power supply line, and a second end of the power supply line is electrically connected to a load; The backup power supply is electrically connected to the source of the first PMOS tube, the drain of the first PMOS tube is electrically connected to the drain of the second PMOS tube, and the source of the second PMOS tube is electrically connected to the first end of the power supply circuit; Another path of the first DC power supply is connected to the input end of the first diode, another path of the second DC power supply is connected to the input end of the second diode, the output end of the first diode and the output end of the second diode are both electrically connected to the gate of the first PMOS tube and the gate of the second PMOS tube; the gate of the first PMOS tube and the gate of the second PMOS tube are both electrically connected to the grounding resistor.

2. The power supply of the server monitoring board according to claim 1, characterized in that: The backup power source is a battery, and the output voltage of the battery is 3.3V.

3. The power supply of the server monitoring board according to claim 1, characterized in that: The first DC power supply is a mainboard power supply with a voltage of 3.3V. The first DC power supply is electrically connected to the first end of the power supply circuit via a third diode.

4. The power supply of the server monitoring board according to claim 1, characterized in that: The second DC power supply is electrically connected to the first end of the power supply circuit via a fourth diode.

5. The power supply of the server monitoring board according to claim 4, characterized in that: The second DC power supply is a 5V USB power supply; the second DC power supply is connected to the fourth diode via a DC step-down circuit.

6. The power supply of the server monitoring board according to claim 5, characterized in that: The DC step-down circuit is a BUCK circuit.

7. The power supply of the server monitoring board according to claim 1, characterized in that: The load includes a sensor and a chip.

8. The power supply of the server monitoring board according to claim 1, characterized in that: The middle node of the power supply line is electrically connected to a filter capacitor, and the filter capacitor is grounded; the second end of the power supply line is connected to a plurality of parallel load branches.

9. The power supply of the server monitoring board according to claim 1, characterized in that: The backup power supply is electrically connected to one end of the analog switch, the other end of the analog switch is electrically connected to the input end of the fifth diode, and the output end of the fifth diode is electrically connected to the first end of the power supply line.

10. The power supply of the server monitoring board according to claim 9, characterized in that: A voltage sensor is provided on the power supply line, and the voltage sensor is electrically connected to a controller, and the controller is used to control the on-off state of the analog switch.

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