CN111900795A - Power supply circuit of BBU internal control circuit in cold standby mode - Google Patents

Abstract

The invention discloses a power supply circuit of a BBU internal control circuit in a cold standby mode, which comprises a BBU unit, a PSU power supply unit, a first power supply system ORING and a second power supply system ORING, wherein the BBU unit comprises a BBU power supply chip, a third MOS tube, a second MOS tube, a first MOS tube, a metering chip, a microcontroller, a DC-DC unit, a first diode, a second diode and a voltage stabilizing diode; the BBU control circuit is powered by two circuits of the PSU and the BBU electric core, the PSU is preferentially used for supplying power, and electric core loss is avoided.

Description

A power supply circuit for BBU internal control circuit in cold standby mode

technical field

The invention relates to the technical field of power supply, in particular to a power supply circuit of a BBU internal control circuit in a cold standby mode.

Background technique

In the storage system, when the AC power is off, it is easy to cause the loss of important data. In order to prevent this from happening, the BBU (Battery Backup Unit) is usually introduced to provide a short-term battery life after the AC is powered off. Data storage to avoid economic losses.

The backup mode of BBU is divided into hot backup and cold backup. Hot backup means that the BBU is always in the backup state, but when the AC is in place, the output voltage of the PSU (Power Supply Unit, power supply unit) is greater than the output voltage of the BBU, and the two pass through the diode. For gating, in fact, the BBU is in the state of backup but not discharge. The disadvantage of hot backup is that the BBU needs to add an additional buck circuit to ensure that the output voltage is lower than the output voltage of the PSU; Enter the backup power state. In this case, the circuit structure is simple, but there is also the possibility that the storage system cannot be powered off in time due to the failure to backup power in time.

In order to avoid losing the power of the BBU cells, the internal control circuit of the BBU is usually converted from the PSU voltage through DC-DC step-down conversion. When the storage system is powered by AC, the discharge enable signal BBU_ENABLE_L is high level (active low), the BBU is not backed up, and the charge enable signal BBU_CHARGE_RATE is enabled at the same time, turn on Q1 to enable the PSU to supply power to the BBU, charge the BBU cells, and charge the battery. The control circuit provides power. When the AC is powered off, the PSU sends the AC_FAIL alarm signal to the system. After the system detects that the AC_FAIL transitions from high to low, it sends the BBU_ENABLE_L enable signal to the BBU microcontroller to notify the BBU to back up and turn off Q1 at the same time. After the BBU microcontroller detects the low level signal of BBU_ENABLE_L, it performs delay debounce processing, and after confirming that the signal is valid, it sends a drive signal to turn on Q2, so that the BBU starts to back up. From the AC power failure to the time when the BBU enters the backup power supply, the BBU control circuit part only relies on the energy storage capacitor to supply power during this period. Unable to complete the backup power, resulting in the loss of user core data, bringing economic losses to users.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a power supply circuit for the internal control circuit of the BBU in the cold standby mode, so as to solve the above-mentioned problems in the background art.

In order to achieve the above object, the present invention provides the following technical solutions: a power supply circuit for a BBU internal control circuit in a cold standby mode, comprising a BBU unit, a PSU power supply unit, a first power supply system ORING and a second power supply system ORING, the BBU unit It includes a BBU power chip, a third MOS tube, a second MOS tube, a metering chip, a microcontroller, a DC-DC unit, a first diode, a second diode and a Zener diode, and the microcontrollers are respectively connected A metering chip, a DC-DC unit and a second MOS tube, the metering chip is connected to a third MOS tube, and the third MOS tube is respectively connected to the BBU power chip, the negative electrode of the Zener diode and the second MOS tube, and the Zener diode is connected to the second MOS tube. The anode is connected to the anode of the second diode, the cathode of the second diode is respectively connected to the DC-DC unit and the cathode of the first diode, and the anode of the first diode is connected to the second MOS tube.

Preferably, the PSU power supply unit is respectively connected to the first MOS transistor and the first power supply system ORING, the first MOS transistor is respectively connected to the second power supply system ORING and the second MOS transistor, the first power supply system ORING and the second power supply system ORING are respectively connected. The power system ORING is connected.

Preferably, the model of the BBU power chip is US18650VTC4.

Preferably, the power supply method includes the following steps:

A. When the AC power supply is normal, the charging enable signal BBU_CHARGE_RATE controls the first MOS tube to turn on, and the PSU power supply supplies power to the BBU internal control circuit through the first diode;

B. After the BBU is inserted into the system motherboard, the system presence detection signal SYS_PRESENT_L is pulled low by the motherboard. When the metering chip detects that the signal is low, the third MOS tube is turned on, and the BBU power chip passes through the Zener diode and the second diode. Provide a second power supply branch to the BBU internal control circuit, so that due to the voltage stabilization effect of the Zener diode and the gating effect of the first diode and the second diode, the BBU internal control circuit is powered by the PSU, avoiding consumes battery power.

The power supply method includes the following steps:

A. When the AC power supply is normal, the charging enable signal controls the first MOS tube to be turned on, and the PSU power supply supplies power to the BBU internal control circuit through the first diode;

B. After the BBU is plugged into the system motherboard, the system in-position detection signal is pulled down by the motherboard. When the metering chip detects that the signal is low, the third MOS tube is turned on, and the BBU power chip passes through the zener diode and the second diode. The BBU internal control circuit provides the second power supply branch.

Preferably, when the AC power is off, the voltage of the PSU power supply decreases rapidly, and the BBU internal control circuit switches to supply power from the battery cell. After the BBU internal microcontroller detects the discharge enable signal, it controls the second The MOS tube is turned on, and the system starts to backup power; after the BBU is pulled out from the main board, the system presence detection signal is set to a high level, the metering chip controls the third MOS tube to turn off, and the BBU cell no longer supplies power to the internal control circuit.

Compared with the prior art, the beneficial effects of the present invention are: the working principle of the present invention is simple, and the risk of power failure of the BBU control circuit can be avoided on the premise of not losing the power of the battery cell, thereby avoiding the possibility of causing data loss to users; Realize that the BBU control circuit is powered by the PSU and the BBU cell, and the PSU is given priority to supply power to avoid cell loss.

Description of drawings

Fig. 1 is the circuit principle diagram of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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, but not all of 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.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end" and "the other end" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, with a specific orientation. The orientation configuration and operation are therefore not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "provided with", "connected", etc., should be understood in a broad sense, for example, "connected" is an electrical connection; It can be directly connected, or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Referring to FIG. 1, the present invention provides a technical solution: a power supply circuit for a BBU internal control circuit in a cold standby mode, including a BBU unit 1, a PSU power supply unit 2, a first power supply system ORING3 and a second power supply system ORING4, so The BBU unit 1 includes a BBU power chip 5 , a third MOS transistor 6 , a second MOS transistor 7 , a metering chip 8 , a microcontroller 9 , a DC-DC unit 10 , a first diode 11 , and a second diode 12 and Zener diode 13, the microcontroller 9 is respectively connected to the metering chip 8, the DC-DC unit 10 and the second MOS tube 7, the metering chip 8 is connected to the third MOS tube 6, and the third MOS tube 6 is respectively Connect the BBU power chip 5, the cathode of the Zener diode 13 and the second MOS tube 7, the anode of the Zener diode 13 is connected to the anode of the second diode 12, and the cathode of the second diode 12 is respectively connected to the DC-DC unit 10 and the cathode of the first diode 11, the anode of the first diode 11 is connected to the second MOS transistor 7; the PSU power supply unit 2 is respectively connected to the first MOS transistor 14 and the first power supply system ORING3, the first MOS transistor 14 The second power supply system ORING4 and the second MOS transistor 7 are respectively connected, and the first power supply system ORING3 is connected with the second power supply system ORING4; the BBU power supply chip 5 model adopts US18650VTC4.

The power supply method of the present invention includes the following steps:

A. When the AC power supply is normal, the charging enable signal controls the first MOS tube to be turned on, and the PSU power supply supplies power to the BBU internal control circuit through the first diode;

B. After the BBU is plugged into the system motherboard, the system in-position detection signal is pulled down by the motherboard. When the metering chip detects that the signal is low, the third MOS tube is turned on, and the BBU power chip passes through the zener diode and the second diode. The BBU internal control circuit provides the second power supply branch.

When the AC is powered off, the voltage of the PSU power supply decreases rapidly, and the internal control circuit of the BBU switches to supply power from the battery cells. After the BBU internal microcontroller detects the discharge enable signal, it controls the second MOS tube to turn on after the delay debounce processing. , start to back up the system; after the BBU is pulled out from the main board, the system presence detection signal is set to a high level, the metering chip controls the third MOS tube to turn off, and the BBU cell no longer supplies power to the internal control circuit.

The specific implementation process is as follows:

The PSU power supply supplies power to the internal control circuit of the BBU through the diode D1. The voltage drop of the diode D1 is about 0.6V, and the output voltage of the PSU ranges from 11.6V to 12.4V, so the voltage of the PSU voltage reaching the DC-DC converter is 11 to 11.8V.

At the same time, the BBU cell is connected to the DC-DC converter through the zener diode ZD1 and diode D2. The US18650VTC4 cell recommends a maximum charging voltage of 4.1V, so the maximum voltage of the BBU cell after 3S2P is 12.3V, and the voltage regulator value for ZD1 selection is 1.8V, the voltage drop of diode D2 is 0.6V, and the voltage at which the cell voltage reaches the DC-DC converter is up to 9.9V, which is less than the voltage from the PSU.

In this way, under normal working conditions, due to the high-level gating effect of D1 and D2, the internal control circuit of the BBU is powered by the PSU, which will not consume the power of the BBU cell, so as to avoid affecting the life of the BBU cell.

When the AC is powered off, the power supply voltage of the PSU to the BBU control circuit drops rapidly and is lower than the voltage from the BBU cells via the ZD1 and D2 branches, and the BBU control circuit switches to the BBU cells for power supply, so there is no risk of power failure.

The metering chip detects the SYS_PRESENT_L signal. When the signal is low, the metering chip controls Q3 to turn on, otherwise Q3 is turned off. This signal will be pulled low only when the BBU is plugged into the motherboard, so Q3 is turned off when the BBU module is in the transport or storage state, and the BBU cells will not supply power to the control circuit, avoiding the loss of battery power during storage. .

To sum up, the working principle of the present invention is simple, and the risk of power failure of the BBU control circuit can be avoided on the premise of not losing battery power, thereby avoiding the possibility of data loss for users; Dual-channel power supply for cores, and priority to use PSU power supply to avoid cell loss.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (5)

1. A power supply circuit of a BBU internal control circuit in a cold standby mode is characterized in that: the power supply system comprises a BBU unit (1), a PSU power supply unit (2), a first power supply system ORING (3) and a second power supply system ORING (4), wherein the BBU unit (1) comprises a BBU power supply chip (5), a third MOS tube (6), a second MOS tube (7), a metering chip (8), a microcontroller (9), a DC-DC unit (10), a first diode (11), a second diode (12) and a voltage stabilizing diode (13), the microcontroller (9) is respectively connected with the metering chip (8), the DC-DC unit (10) and the second MOS tube (7), the metering chip (8) is connected with the third MOS tube (6), the third MOS tube (6) is respectively connected with the cathode of the BBU power supply chip (5), the cathode of the voltage stabilizing diode (13) and the second MOS tube (7), the anode of the voltage stabilizing diode (13) is connected with the anode of the second diode (12), and the cathode of the second diode (12) is respectively connected with the DC-DC unit (10) and the first diode (11) And the anode of the first diode (11) is connected with the second MOS tube (7).

2. The power supply circuit of the BBU internal control circuit in the cold standby mode according to claim 1, wherein: PSU power supply unit (2) are connected first MOS pipe (14) and first electrical power generating system ORING (3) respectively, second electrical power generating system ORING (4) and second MOS pipe (7) are connected respectively in first MOS pipe (14), first electrical power generating system ORING (3) and second electrical power generating system ORING (4) link to each other.

3. The power supply circuit of the BBU internal control circuit in the cold standby mode according to claim 1, wherein: the BBU power supply chip (5) adopts a model number US18650VTC 4.

4. The method for realizing the power supply of the power supply circuit of the BBU internal control circuit in the cold standby mode according to claim 1, is characterized in that: the power supply method comprises the following steps:

A. when the AC supplies power normally, the charging enable signal controls the first MOS tube to be opened, and the PSU power supply supplies power to the BBU internal control circuit through the first diode;

B. after the BBU is inserted into the system mainboard, the system on-site detection signal is pulled down by the mainboard, when the metering chip detects that the signal is low, the third MOS tube is opened, and the BBU power supply chip provides a second power supply branch for the BBU internal control circuit through the voltage stabilizing diode and the second diode.

5. The method of claim 4, wherein the method further comprises the steps of: when the AC is powered off, the voltage of the PSU power supply is rapidly reduced, the BBU internal control circuit is switched to be powered by the electric core, and after the BBU internal microcontroller detects a discharge enabling signal, the second MOS tube is controlled to be opened through time delay jitter elimination processing, and the system is started to be supplied with power; after the BBU is pulled out of the main board, a system position detection signal is set to be high level, the metering chip controls the third MOS tube to be turned off, and the BBU electric core does not supply power to the internal control circuit any more.

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