CN105867575B - Charging and discharging chip architecture applied to server backup battery - Google Patents

Abstract

The invention discloses a charging and discharging chip architecture applied to a server backup battery, which structurally comprises a control chip and 4 groups of MOSFETs, wherein a D pole of the MOSFET Q1 is connected with a positive pole of a battery module, a G pole of the MOSFET Q1 is connected with a UG1 end of the control chip, an S pole of the MOSFET Q2 is connected with a D pole of Q3 and is connected to the S pole of Q2 in series through an inductor, a G pole of Q3 is connected with a L G1 end of the control chip and is grounded, a G pole of Q2 is connected with a UG2 end of the control chip, a D pole of the Q2 is connected with a 12V bus, and an S pole of the Q4 is connected with the D pole of the Q4 and is connected with a G L G2 end of the control chip and is grounded.

Description

A charging and discharging chip architecture applied to server backup battery

technical field

The invention relates to the technical field of computer chip design, in particular to a charging and discharging chip architecture applied to a backup battery of a server, and a set of hardware circuits for charging the backup battery and supplying power to the server power bus after the mains power is cut off.

Background technique

The discharge voltage of a single-cell lithium battery is 4.2~3V. When the mains power is cut off, the backup battery supports the operation of the server. Generally, the lithium battery is connected in series to provide power. Therefore, there is a certain contradiction. The power supply of the backup lithium battery module conflicts with the undervoltage protection and overvoltage protection in the server because of the wide discharge range of the lithium battery. Therefore, many problems will be caused during use.

The traditional server backup lithium battery module is 3 series N parallel method to meet the output of the 12V power bus. The discharge range of the 3 series lithium battery is 12.6~9V, and the soft start control circuit of the server is generally set to 11V for undervoltage protection. , when the lithium battery discharge voltage reaches 11V, there are still about 50% of the capacity not fully discharged. In order to meet the sufficient discharge time, 50% of parallel lithium batteries must be added, resulting in an increase in the space of the backup lithium battery module.

Contents of the invention

The technical problem to be solved by the present invention is: In order to solve the above problems, the present invention proposes a charging and discharging chip architecture applied to the backup battery of the server, and realizes charging the backup lithium battery module through the 12V power bus, which requires the lithium battery module to supply power , the control adjusts the output of the backup lithium battery module to 12V to supply the 12V bus of the server.

The technical scheme adopted in the present invention is:

A charging and discharging chip architecture applied to server backup batteries, its structure includes Control IC (control chip) and 4 groups of MOSFETs (metal-oxide semiconductor field effect transistors), in which the D pole (drain) of MOSFET Q1 is connected to the battery module The positive pole of the group, the G pole (gate) is connected to the UG1 terminal of the control chip, the S pole is connected to the D pole of MOSFET Q3, and is connected in series to the S pole (source) of MOSFET Q2 through an inductor; the G pole of MOSFET Q3 is connected to the control chip The LG1 terminal of MOSFET Q2, the S pole is grounded; the G pole of MOSFETQ2 is connected to the UG2 terminal of the control chip, the D pole is connected to the 12V bus, the S pole is connected to the D pole of MOSFET Q4; the G pole of MOSFETQ4 is connected to the LG2 terminal of the control chip, and the S The pole is grounded; the positive pole of the battery module is connected to the FB1 terminal of the control chip through a line, and the 12V bus is connected to the FB2 terminal of the control chip through a line;

When the battery module is discharged, when the battery voltage is higher than 12V, the Control IC controls MOSFET Q4 to turn off, Q2 to turn on, and outputs PWM (pulse width modulation) signal to Q1 and Q3 to form a Buck-type step-down circuit; when the battery voltage is lower than 11V , the Control IC controls Q1 to turn on, Q3 to turn off, and outputs PWM signals to Q2 and Q4 to form a Boost type boost circuit;

When the battery module is charging, when the battery voltage is higher than 12V, the Control IC controls Q2 to turn on and Q4 to turn off, and outputs PWM signals to Q1 and Q3 to form a BOOST boost circuit; when the battery voltage is lower than 12V, the Control IC controls Q1 to turn on On, Q3 is turned off, and output PWM signal to Q2 and Q4 to form a Buck-type step-down circuit.

According to the combination of battery module backup lithium battery, the control chip judges the charging voltage, sets the charging current, charges the battery through the 12V bus power supply, and judges according to the battery voltage to realize trickle current, constant current and constant voltage. charging mode.

The control chip judges the discharge voltage of the battery according to the backup lithium battery combination of the battery module, and sets the voltage output to the server power bus to 12V by boosting or stepping down the voltage to ensure a stable voltage output.

After the battery is charged, the control chip is powered off, and the system will automatically judge the bus voltage of the server. When the bus voltage is lower than 11V, it will start and supply power to the bus.

According to the combination of backup batteries, the control chip sets the charging voltage of the battery by boosting or bucking the voltage.

The control chip sets the output to the server bus by boosting or bucking the voltage, and ensures that the output voltage is 12V.

The control chip realizes real-time communication with the system management unit or the battery through the Pmbus signal bus. Such as: collect battery module information, such as remaining power, battery temperature and abnormal state of the battery; inform the system management unit of the output power, the remaining power supply time, and notify the system to reduce the power consumption when the battery power is too low to meet the startup of the backup power supply system .

The beneficial effects of the present invention are:

The present invention realizes the supply matching between the backup battery modules with different serial-parallel structures and the 12V power bus of the server, and the charging matching between the 12V bus and the battery module through a certain topology structure, and has corresponding protection and Pmbus communication functions. Voltage or step-down supply to the 12V bus, realizing the function of prolonging the battery discharge time, avoiding the conflict between the undervoltage protection function of the server 12V bus and the battery discharge interval, thereby reducing the number of lithium batteries in the battery module and saving the space for backup batteries , can realize the compatibility of the server 12V power bus to the backup battery module, realize the charging and discharging matching between the lithium battery module of any series structure and the 12V bus, and avoid the conflict between the UVP protection of the server motherboard and the discharge interval of the lithium battery.

Description of drawings

Fig. 1 is a schematic diagram of the circuit design structure of the present invention.

Detailed ways

Below in conjunction with accompanying drawing of description, the present invention is further described according to specific embodiment:

Example 1:

As shown in Figure 1, a charging and discharging chip architecture applied to server backup batteries, its structure includes ControlIC (control chip) and 4 groups of MOSFETs (metal-oxide semiconductor field effect transistors), in which the D pole (drain of MOSFET Q1) pole) is connected to the positive pole of the battery module, the G pole (gate) is connected to the UG1 terminal of the control chip, the S pole is connected to the D pole of MOSFET Q3, and is connected in series to the S pole (source) of MOSFET Q2 through an inductor; The G pole is connected to the LG1 terminal of the control chip, and the S pole is grounded; the G pole of MOSFET Q2 is connected to the UG2 terminal of the control chip, the D pole is connected to the 12V bus, the S pole is connected to the D pole of MOSFET Q4; the G pole of MOSFET Q4 is connected to The LG2 terminal of the control chip, the S pole is grounded; the positive pole of the battery module is connected to the FB1 terminal of the control chip through a line, and the 12V bus is connected to the FB2 terminal of the control chip through a line;

When the battery module is discharged, when the battery voltage is higher than 12V, the Control IC controls MOSFET Q4 to turn off, Q2 to turn on, and outputs PWM (pulse width modulation) signal to Q1 and Q3 to form a Buck-type step-down circuit; when the battery voltage is lower than 11V , the Control IC controls Q1 to turn on, Q3 to turn off, and outputs PWM signals to Q2 and Q4 to form a Boost-type boost circuit;

When the battery module is charging, when the battery voltage is higher than 12V, the Control IC controls Q2 to turn on and Q4 to turn off, and outputs PWM signals to Q1 and Q3 to form a BOOST boost circuit; when the battery voltage is lower than 12V, the Control IC controls Q1 to turn on On, Q3 is turned off, and output PWM signal to Q2 and Q4 to form a Buck-type step-down circuit.

Example 2

On the basis of Embodiment 1, the control chip described in this embodiment judges the charging voltage according to the combination of the lithium battery backed up by the battery module, sets the charging current, charges the battery through the 12V bus power supply, and performs judgment based on the battery voltage. Trickle, constant current, constant voltage and other three charging modes.

Example 3

On the basis of Embodiment 1, the control chip described in this embodiment judges the discharge voltage of the battery according to the backup lithium battery combination of the battery module, and sets the voltage output to the server power bus to 12V by boosting or stepping down the voltage, and Ensure stable voltage output.

Example 4

On the basis of any one of Embodiments 1, 2, or 3, the control chip described in this embodiment will automatically determine the bus voltage of the server when the mains power is cut off after the battery is fully charged. When the bus voltage is lower than 11V, it will Start up within 2ms and supply power to the bus.

Example 5

On the basis of Embodiment 4, the control chip in this embodiment sets the charging voltage of the battery by increasing or decreasing the voltage according to the combination of the backup batteries.

Example 6

On the basis of Embodiment 5, the control chip described in this embodiment sets the output to the server bus by boosting or bucking the voltage, and ensures that the output voltage is 12V.

Example 7

On the basis of Embodiment 6, the control chip described in this embodiment realizes real-time communication with the system management unit or the battery through the Pmbus signal bus. Such as: collect battery module information, such as remaining power, battery temperature and abnormal state of the battery; inform the system management unit of the output power, the remaining power supply time, and notify the system to reduce the power consumption when the battery power is too low to meet the startup of the backup power supply system .

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical fields can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (7)

1. a kind of charge and discharge chip architecture applied to server backup battery, it is characterised in that：Its structure includes control chip With 4 groups of MOSFET, the anode of the poles the D connection battery modules of wherein MOSFET Q1, the ends UG1 of the poles G connection control chip, the poles S connect The poles D of MOSFET Q3 are connect, and are connected in series to the poles S of MOSFET Q2 by an inductance；The poles the G connection control core of MOSFET Q3 The ends LG1 of piece, the poles S ground connection；The poles G of MOSFET Q2 are connected to the ends UG2 of control chip, and the poles D are connected to 12V buses, and the poles S connect It is connected to the poles D of MOSFET Q4；The poles G of MOSFET Q4 are connected to the ends LG2 of control chip, the poles S ground connection；The anode of battery modules By a connection in the ends FB1 of control chip, 12V buses are by a connection in the ends FB2 of control chip；

When battery modules are discharged, when cell voltage is higher than 12V, control chip controls MOSFET Q4 shutdowns, Q2 conductings export PWM Signal is depressured circuit to MOSFET Q1 and MOSFET Q3 composition Buck types；When cell voltage is less than 11V, chip controls are controlled MOSFET Q1 conductings, MOSFET Q3 shutdowns, output pwm signal to MOSFET Q2 and MOSFET Q4, composition Boost type boosting Circuit；

When battery modules charge, when cell voltage is higher than 12V, control chip controls MOSFET Q2 conductings, MOSFET Q4 are turned off, Output pwm signal forms BOOST booster circuits to MOSFET Q1 and MOSFET Q3；When cell voltage is less than 12V, control core Piece controls MOSFET Q1 conductings, MOSFET Q3 shutdowns, and output pwm signal to MOSFET Q2 and MOSFET Q4 forms Buck Type is depressured circuit.

2. a kind of charge and discharge chip architecture applied to server backup battery according to claim 1, it is characterised in that： The control chip judges its charging voltage size according to the combination of battery modules backup lithium battery, and charging current is arranged, It is charged the battery by 12V bus power sources.

3. a kind of charge and discharge chip architecture applied to server backup battery according to claim 1, it is characterised in that： The control chip is combined according to battery modules backup lithium battery, is judged the discharge voltage of battery, is passed through what is boosted or be depressured Mode, setting output are 12V to server power supply bus voltage.

4. according to any a kind of charge and discharge chip architecture applied to server backup battery in claim 1,2 or 3, It is characterized in that：The control chip is after battery is charged, alternating current power-off, system meeting automatic decision server-bus voltage, when Bus voltage is less than 11V, starts and to bus-powered.

5. a kind of charge and discharge chip architecture applied to server backup battery according to claim 4, it is characterised in that： The control chip sets the charging voltage of battery according to the combination of reserce cell by way of boosting or being depressured.

6. a kind of charge and discharge chip architecture applied to server backup battery according to claim 5, it is characterised in that： For the control chip by way of boosting or being depressured, setting output ensures that output voltage is 12V to server-bus.

7. a kind of charge and discharge chip architecture applied to server backup battery according to claim 6, it is characterised in that： The control chip realizes the real-time Communication for Power with System Management Unit or battery by Pmbus signal bus.