CN1472863A - Single board power supply backup method and single board power supply backup system - Google Patents

Abstract

The invention relates to a single board power supply backup method and a single board power supply backup system thereof. The single-board power supply backup method comprises the following steps: firstly, introducing voltage to a single plate through a bus; and converting the introduced voltage into required low voltage by DC/DC on the single board, setting a backup power supply, introducing the output of the backup power supply into each single board, disconnecting the backup power supply circuit when the single board power supply works normally, and setting the backup power supply circuit as a closed circuit when the single board power supply fails. The single board power supply backup system comprises a high-low voltage bus, a backup power supply, a DC/DC power supply and a diode D1 connected in series with the DC/DC power supply, and is characterized by also comprising a detection switching circuit, wherein when the single board normally works, the detection switching circuit enables the power supply backup board to be in an open circuit state, and when the single board power supply fails, the detection switching circuit is connected with a backup power supply loop to supply power for the service single board. By the invention, the power of the backup power supply is reduced, and the cost is greatly saved.

Description

A single-board power backup method and a single-board power backup system

technical field

The invention relates to the communication field, in particular to a method for backing up a service single-board power supply and a single-board power supply backup system thereof.

technical background

In the communication field, the uninterrupted power supply of the communication system is the most basic guarantee for the normal and stable operation of the communication system. The MTBF of the secondary module power supply used in the existing communication system is generally between 1500Khours-5000KHours. Although the secondary module power supply has high reliability, in order to ensure uninterrupted power supply in the event of an accident, the industry usually designs a backup system in the system to back up the secondary power supply in order to When a certain (some) module power fails, the normal operation of the system is guaranteed.

In the prior art, common methods for protecting and backing up the power supply are as follows:

1) n+1 centralized power supply mode: In this mode, n+1 (n≥1) identical power boards are used in parallel at the same time to provide centralized power supply for the system, and the system power<power board power×n. When any power board fails, the system will be powered by the remaining n power boards, and services will not be affected in any way. However, the reliability of centralized power supply is lower than that of decentralized power supply.

2) Board-level hot backup: In this mode, each board is directly connected to a 48V power supply, and the DC/DC of this board is used to convert 48V to the required low voltage, and the DC/DC of this board is used for 1+1 hot backup.

3) Mode of decentralized power supply and centralized hot backup: In this mode, each single board directly introduces 48V power supply, and converts 48V to the required low voltage through the DC/DC of this board; at the same time, the system provides a backup power board, which outputs and introduces each The single board, together with the DC/DC of this board, supplies power for the single board. When the DC/DC of any board fails, it can be powered by the backup power board, and services will not be affected in any way. Obviously, this is an improvement of method 2. All the backup power supplies originally located on the service boards are centralized, which is essentially 1+1 backup. Since the backup power supply supplies power to the service board at the same time as the power supply of the board, it is essentially a 1+1 backup, so the power of the backup power supply must be sufficient to support the entire system.

The third method is a relatively advanced backup method, and Figure 1 is a power supply structure diagram of this method.

Although the above several schemes can realize the backup of the power supply, they all have the following disadvantages:

1) The power of the backup power supply is relatively large, the cost is relatively high, and the heat dissipation design is also very difficult.

2) Due to the large current passing through the low-voltage busbar on the backplane, it is difficult to solve the problem of large voltage drop on the low-voltage busbar on the backplane, which makes it impossible to apply to low-voltage and high-current systems.

3) The backup power supply is also in working condition at ordinary times, and the load is heavy, thereby reducing the reliability of itself.

In addition, the existing n+1 centralized power supply and centralized hot backup still have the following disadvantages:

1) Since the power board occupies too many board positions, the configuration of the service board is reduced, which affects the integration degree of the system.

2) The reliability of the centralized power supply mode is low.

3) It is difficult to solve the problem of large voltage drop on the low-voltage bus on the backplane, and cannot be applied to low-voltage, high-current systems.

4) The backup power supply is usually in a working state, which makes the load heavier, thereby reducing its own reliability.

Contents of the invention

The purpose of the present invention is to provide a single-board power backup method and a single-board power backup system that can reduce the power of the backup power supply, reduce the current of the backplane low-voltage bus, and keep the backup power supply in a light-load state at ordinary times.

Among them, the single-board power supply backup method of the present invention adopts a decentralized power supply mode, first introduces voltage to the single board through the bus bar, and then converts the introduced voltage into the required working voltage of the single board through the DC/DC on the single board, and simultaneously sets A backup DC/DC power supply is connected in parallel with the DC/DC power supply on the single board, and finally its output is introduced into each single board. When the board power fails, connect the backup DC/DC power circuit.

The single-board power backup method also includes configuring a detection switching circuit on each single board, through which the circuit controls the opening and closing of the backup power circuit, that is: when the single board is working normally, the detection switching circuit makes the backup power circuit In an open state, when the single board power fails, the detection switching circuit connects the backup power circuit to supply power for the business single board.

The single board power supply backup method also includes setting an energy storage resistor on the single board, one end of the energy storage resistor is grounded, and the other end is connected to a load, so as to supply power to the business single board during the circuit switching process.

The single board power backup method further includes a step of reporting power failure information to the system when the power supply of the service single board fails.

A single-board power supply backup system, including a high-voltage and low-voltage busbar, a backup DC/DC power supply connected to the high-voltage and low-voltage busbar, a single-board DC/DC power supply, an isolation diode D1 connected in series with the single-board DC/DC power supply, and the anode of the diode D1 Connect the high potential, the backup DC/DC power supply is connected in parallel with the single-board DC/DC power supply, and it is characterized in that it also includes a detection switching circuit, one end is connected between the single-board DC/DC power supply and the isolation diode D1, and the other end is connected Low-voltage bus, when the single board is working normally, the detection switching circuit makes the power backup board in an open state, when the single board power fails, the detection switching circuit connects the backup power circuit to supply power for the business single board.

The detection switch circuit includes a switch circuit and a sampling detection circuit, wherein one end of the switch circuit is connected to the low-voltage bus, and the other end is connected to the negative pole of the diode D1, and the input end of the sampling detection circuit is connected to the single Between the board DC/DC power supply and the diode D1, the output end is connected to the input end of the switch circuit.

The switching circuit includes a MOS transistor Q4, a resistor R2 and a diode D4 connected in parallel. The drain of the MOS transistor Q4 is connected to the low-voltage bus, and the gate receives the control signal input by the detection sampling circuit.

The detection circuit includes resistors R12 and R13 connected in series, wherein one end of R13 is connected to the anode of the diode D1, the other end is connected to the input end of a detection chip, and the output end of the detection chip is connected to the gate of the MOS transistor Q4 , to complete the detection of the output voltage of the single-board DC/DC power supply, and output a driving signal when the output voltage is abnormal, and turn on the switch circuit.

The single-board power backup system also includes a slow start circuit, the slow start circuit is connected between the low-voltage bus and the switching circuit, and includes resistors R6 and R7 connected in series, and a capacitor C1 connected in parallel with R6, A diode D3 and a MOS transistor Q3, wherein the drain of the MOS transistor Q3 is connected to the drain of the MOS transistor Q4.

The detection switching circuit further includes an energy storage capacitor C, one end of which is connected to the load and the other end is grounded, and is used to supply power to the load during the switching process.

Through the single-board backup method and single-board backup system of the present invention, the power configuration of the backup power supply is flexible, the power of the backup power supply is reduced, and a large amount of cost is saved. The backup power supply is basically in a light-load state, with low temperature rise and relatively high reliability.

Description of drawings

Figure 1 is a structural block diagram of decentralized power supply and centralized hot backup power supply;

Fig. 2 is a power supply structure diagram of the power supply cold backup system of the present invention;

Fig. 3 is a circuit diagram of the embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

As shown in Figure 2, the present invention has designed a novel single-board power supply backup system, and the same parts as the single-board power supply backup system in the prior art are high and low voltage busbars, backup DC/DC power supply, single-board DC/DC Power supply, diode, the anode of the diode is connected to the high potential of the system, and the bus bar is used to provide the power input for the normal operation of the system. Like the DC power supply, it is used to convert the DC voltage input by the high-voltage and low-voltage bus into the DC voltage required by the board. For example, the voltage provided by the bus may be 48 volts, and the operating voltage required by the board is 5 volts. The DC/DC is This 48 volts can be converted to an operating voltage of 5 volts.

On the basis of the above-mentioned original backup system, the present invention adds a detection switching circuit, which ensures that the circuit of the backup DC/DC power supply is disconnected when the single board is working normally, so that the single board is powered by the single board DC/DC power supply. Complete, when the DC/DC power supply of the single board fails to supply power normally due to problems, the DC/DC power supply of the power backup board supplies power to ensure the normal operation of the single board.

As shown in FIG. 3 , the detection switch circuit includes: a switch circuit, a sampling detection circuit and a slow start circuit.

The detection circuit includes a sampling circuit and a detection chip. There can be multiple types of detection chips, and comparators with reference sources can be used in the present invention. For example, the detection chip used in this embodiment is the MC33161 model. The sampling The circuit includes resistors R12 and R13 connected in series, wherein one end of R13 is connected to the anode of the diode D1, the other end is connected to the input end of the detection chip, which is pin 3 in this embodiment, and the other end of R12 is grounded. The output pin 5 of the detection chip is connected to the gate of the MOS transistor Q4. When the circuit is working, first set a threshold, and the sampling circuit samples the output voltage of the board and sends it to the detection chip pin 3. When the output is lower than the set When the threshold is set, the pin 5 of the detection chip is reversed from high level to low level, the detection is completed, and the switching signal is output to the switch circuit to connect the backup power supply.

The switching circuit includes a MOS transistor Q4, a diode D1 and a resistor R2 connected in parallel, the cathode of the diode D4 is connected to the source of the MOS transistor Q4, the drain of the MOS transistor Q4 is connected to the low-voltage bus, and the gate receives the control input from the detection sampling circuit Signal. At the gate of Q4, another current limiting resistor R3 can be connected. The drain of Q4 is connected to pin 5 of the detection chip, which is the output end of the detection circuit.

It also includes a slow start circuit, which is connected between the low-voltage bus and the switch circuit, including resistors R6 and R7 connected in series, capacitor C1 connected in parallel with R6, diode D3 and MOS transistor Q3, wherein the MOS The drain of the transistor Q3 is connected to the drain of the MOS transistor Q4. The slow start circuit controls the MOS tube D3 to turn on slowly to avoid ignition when the board is hot-swapped.

In the present invention, the MOS transistors Q3 and Q4 can both use P-channel, low-voltage-drop MOS transistors, and the gates can be grounded.

In the present invention, the MOS transistors Q3 and Q4 are used oppositely, and the purpose of isolating the backup power supply from the main board power supply is achieved without using a diode, which is the key point.

In order to ensure that the single board can be switched without fail, an energy storage capacitor C is also arranged on the single board. One end of the capacitor C is connected to the negative pole of the diode D1, and the other end is grounded. During the switching process, the energy storage capacitor C supplies power to the single board.

The single-board power supply backup method of the present invention adopts a decentralized power supply mode, introduces voltage to the single board through the bus bar, and then converts the voltage introduced by the bus bar into the low voltage required by the single board through the DC/DC on the single board, and simultaneously sets a backup The power supply board leads its output to each single board. When the power supply of the single board is working normally, the backup power supply circuit is disconnected. When the power supply of the single board fails, the backup power supply is set as a closed circuit.

The present invention configures a detection switching circuit on each single board. When the single board is working normally, the detection switching circuit makes the power supply backup board in an open state. Power supply for business boards.

The present invention also arranges an energy storage resistor on the single board, and the energy storage resistor supplies power to the single board when the circuit is switched.

When the power supply of the service single board fails, a step of reporting information to the system is also included. Report the failure of the single board to the system, so that time can be gained as soon as possible to complete the repair of the faulty power supply, so as to avoid excessive use of the backup power supply and reduce the safety factor of the system.

Through the application of the single-board power supply backup system and backup method of the present invention, the power configuration of the backup power supply is flexible, the power of the backup power supply is reduced, a large amount of cost is saved, and the line voltage drop of the backup power supply is reduced at the same time. The backup power supply is basically in a light-load state, with low temperature rise and relatively high reliability.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technology can easily think of changes or replacements within the technical scope disclosed in the present invention. , should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1, a kind of one-board power supply backup method, adopt the decentralized power-supply mode, introduce voltage by bus and give veneer, and then be the required operating voltage of veneer with the voltage transitions of introducing, a backup DC/DC power supply is set simultaneously by the DC/DC on the veneer, in parallel with the DC/DC power supply on the veneer, each veneer is introduced in its output, it is characterized in that: when the one-board power supply operate as normal, will back up the DC/DC electric power loop and disconnect, when one-board power supply lost efficacy, will back up the DC/DC electric power loop and connect.

2, one-board power supply backup method as claimed in claim 1, it is characterized in that also being included in a detection of configuration commutation circuit on each veneer, switching by this circuit control backup battery loop, during normal working of single board, this detection commutation circuit makes the backup battery loop be in open-circuit condition, when one-board power supply lost efficacy, this detected commutation circuit and connects the backup battery loop, was the service board power supply.

3, one-board power supply backup method as claimed in claim 2 is characterized in that also being included in an energy storage resistance is set on the veneer, this energy storage resistance one end ground connection, and the other end connects load, in the circuit handoff procedure, is the service board power supply.

4,, when it is characterized in that the power-fail when service board, also comprise a step that reports power-fail information to system as claim 1,2 or 3 each described one-board power supply backup methods.

5, a kind of one-board power supply standby system, comprise the high-low pressure bus, backup DC/DC power supply that links to each other with the high-low pressure bus and veneer DC/DC power supply, the isolating diode D1 that connects with veneer DC/DC power supply, the positive pole of this diode D1 connects high potential, described backup DC/DC power supply is in parallel with veneer DC/DC power supply, it is characterized in that comprise that is also detected a commutation circuit, an end is connected between veneer DC/DC power supply and the isolating diode D1, the other end connects low-voltage bus bar, during normal working of single board, this detection commutation circuit makes the power supply backup plate be in open-circuit condition, when one-board power supply lost efficacy, this detects commutation circuit and connects the backup battery loop, is the service board power supply.

6, one-board power supply standby system as claimed in claim 5, it is characterized in that described detection commutation circuit comprises switching switch circuit, sample detecting circuit, described switching switch circuit one end is connected in low-voltage bus bar, the other end is connected in the negative pole of diode D1, described sample detecting circuit input end is connected between veneer DC/DC power supply and the diode D1, and output is connected in the input of switching switch circuit.

7, one-board power supply standby system as claimed in claim 6, it is characterized in that described switching switch circuit comprises metal-oxide-semiconductor Q4, resistance R 2 and the diode D4 of connection parallel with one another, the drain electrode of described metal-oxide-semiconductor Q4 connects low-voltage bus bar, and gate pole receives the control signal that detects the sample circuit input.

8, one-board power supply standby system as claimed in claim 6, it is characterized in that described testing circuit comprises resistance R 12 and the R13 that is connected in series, wherein, the end of R13 is connected the positive pole of diode D1, the other end is connected in the input of a detection chip, and the output of detection chip is connected in the gate pole of metal-oxide-semiconductor Q4, finishes the detection to veneer DC/DC electric power output voltage, and when output voltage is unusual output drive signal, open switching circuit.

9, one-board power supply standby system as claimed in claim 7, it is characterized in that also comprising a soft-start circuit, described soft-start circuit is connected between low-voltage bus bar and the switching switch circuit, comprise the resistance R 6 and the R7 that are connected in series, the capacitor C 1 that is connected in parallel with R6, diode D3 and metal-oxide-semiconductor Q3, wherein, the drain electrode of this metal-oxide-semiconductor Q3 links to each other with the drain electrode of metal-oxide-semiconductor Q4.

10, as claim 5,6,7,8 or 9 each described one-board power supply standby systems, it is characterized in that described detection commutation circuit also comprises a storage capacitor C, this storage capacitor C one end connects load, and other end ground connection is used for powering to the load in handoff procedure.

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