CN218216725U

CN218216725U - Battery backup unit

Info

Publication number: CN218216725U
Application number: CN202221973859.7U
Authority: CN
Inventors: 张宇; 吴士涛; 任晓明; 吉祥磊
Original assignee: Beijing Zhouyuan Technology Co ltd
Current assignee: Beijing Zhouyuan Technology Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2023-01-03
Anticipated expiration: 2032-07-28

Abstract

The present disclosure provides a battery backup unit, comprising: the charging device comprises a constant current charging module, a power supply module, a main control chip and a rechargeable battery; the input end of the constant current charging module is electrically connected with the first port of the battery backup unit, and the output end of the constant current charging module is electrically connected with the second port of the battery backup unit; the output end of the constant current charging module is grounded through a capacitor; the first end of the power supply module is electrically connected with the output end of the constant-current charging module, the second end of the power supply module is electrically connected with the positive electrode end of the rechargeable battery, and the third end of the power supply module is electrically connected with the charge-discharge control end of the main control chip; the first voltage detection end of the main control chip is electrically connected with the output end of the constant current charging module through a resistor, and the second voltage detection end and the power supply end of the main control chip are electrically connected to the positive end of the rechargeable battery through resistors respectively; and the negative electrode end of the rechargeable battery is grounded through the third port of the battery backup unit. The arrangement of the constant-current charging module can provide stable charging current for the rechargeable battery, and further the service life of the battery is prolonged.

Description

Battery backup unit

Technical Field

The present disclosure relates to the field of power supply technologies, and in particular, to a battery backup unit.

Background

On the storage server, reliability of the data is particularly important. In order to ensure that data on the storage server is not lost, a Battery Backup Unit (BBU) is mostly configured on the storage server. Under the condition that the mains supply is powered off, the BBU supplies power to the storage server to maintain the storage of normal service data of the system and avoid data loss. And under the condition of commercial power restoration, the storage server supplies power to the BBU so as to charge the battery built in the BBU. However, the storage server inevitably fluctuates in the process of supplying power to the BBU, which results in that stable charging current cannot be supplied to the BBU, and further affects the service life of the battery built in the BBU.

Disclosure of Invention

In view of this, the present disclosure provides a battery backup unit, which can provide a stable charging current for a built-in rechargeable battery during charging, thereby improving the service life of the rechargeable battery.

According to an aspect of the present disclosure, there is provided a battery backup unit including: the device comprises a constant-current charging module, a power supply module, a main control chip and a rechargeable battery;

the input end of the constant current charging module is electrically connected with the first port of the battery backup unit so as to be connected with an external power supply through the first port of the battery backup unit, and the output end of the constant current charging module is electrically connected with the second port of the battery backup unit so as to provide power supply voltage for electric equipment through the second port of the battery backup unit; the output end of the constant current charging module is also connected with a capacitor connected in series, and one end of the capacitor connected in series, which is not connected with the output end of the constant current charging module, is grounded;

the first end of the power supply module is electrically connected with the output end of the constant current charging module, the second end of the power supply module is electrically connected with the positive electrode end of the rechargeable battery, and the third end of the power supply module is electrically connected with the charging and discharging control end of the main control chip so as to control charging of the rechargeable battery or supply power supply voltage to the electric equipment according to the control signal sent by the main control chip;

the first voltage detection end of the main control chip is electrically connected with the output end of the constant current charging module through a resistor, and the second voltage detection end and the power supply end of the main control chip are electrically connected to the positive end of the rechargeable battery through resistors respectively;

and the negative electrode end of the rechargeable battery is grounded through the third port of the battery backup unit.

In one possible implementation manner, the constant current charging module includes: the constant current charging control chip comprises a constant current charging control chip, a first light emitting diode, a second light emitting diode, a resistor and a capacitor;

the voltage input end of the constant current charging control chip is used as the input end of the constant current charging module;

the battery connecting end of the constant current charging control chip is used as the output end of the constant current charging module;

the voltage detection end of the constant current charging control chip is connected to the battery connection end of the constant current charging control chip through a resistor;

the current setting and detecting end of the constant current charging control core is grounded through a resistor;

the temperature detection end of the constant-current charging control core is grounded;

a first charging indication end and a second charging indication end of the constant current charging control chip are respectively electrically connected to the cathodes of a first light-emitting diode and a second light-emitting diode, and the anodes of the first light-emitting diode and the second light-emitting diode are electrically connected and then electrically connected to the first port of the battery backup unit through a resistor;

the voltage input end of the constant current charging control chip and the battery connecting end of the constant current charging control chip are electrically connected with a capacitor and then grounded;

and the grounding end of the constant current charging control chip is grounded.

In one possible implementation, the power supply module includes: the field effect transistor comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a resistor and a capacitor;

the grid electrodes of the first field effect tube, the second field effect tube and the third field effect tube are respectively and electrically connected to the charge-discharge control end of the main control chip through resistors, and resistors are respectively and electrically connected among the grid electrodes and the source electrodes of the first field effect tube, the second field effect tube and the third field effect tube;

the source electrode of the second field effect transistor is used as the first end of the power supply module, the drain electrode of the second field effect transistor is electrically connected to the drain electrode of the third field effect transistor, and the source electrode of the third field effect transistor is used as the second end of the power supply module; a series capacitor is arranged in parallel between the source electrode of the second field effect transistor and the source electrode of the third field effect transistor;

the source electrode of the first field effect transistor is electrically connected to the drain electrode of the second field effect transistor, and the drain electrode of the first field effect transistor is electrically connected to the source electrode of the third field effect transistor through a resistor;

the grid electrode of the fourth field effect transistor is grounded through a resistor, the source electrode of the fourth field effect transistor is electrically connected to the source electrode of the second field effect transistor, and the drain electrode of the fourth field effect transistor is electrically connected to the grid electrode of the second field effect transistor.

In a possible implementation manner, the device further comprises a constant voltage output module;

the voltage input end of the constant voltage output module is electrically connected with the enable end and then is electrically connected to the output end of the constant current charging module as the input end of the constant voltage output module;

a voltage output terminal of the constant voltage output module is electrically connected to a second port of the battery backup unit;

the capacitor positive end and the capacitor negative end of the constant voltage output module are electrically connected through a capacitor;

the grounding end of the constant voltage output module is grounded;

the input end of the constant voltage output module and the output end of the constant voltage output module are both electrically connected with the capacitor and then grounded.

In a possible implementation manner, the model of the main control chip is BQ40Z50.

In one possible implementation, the battery backup unit further includes a current detection module;

the current detection module comprises an eighth resistor, a ninth resistor, a tenth resistor, a seventh capacitor, a fifteenth capacitor and a seventeenth capacitor;

a first end of the tenth resistor is electrically connected with a negative electrode end of the rechargeable battery, and a second end of the tenth resistor is electrically connected with a third port of the battery backup unit;

the eighth resistor is electrically connected between the first end of the tenth resistor and the first port of the current detection end of the main control chip;

the ninth resistor is electrically connected between the second end of the tenth resistor and the second port of the current detection end of the main control chip;

the seventh capacitor is electrically connected between the first port of the current detection end of the main control chip and the second port of the current detection end of the main control chip;

and the first port of the current detection end of the main control chip and the second port of the current detection end of the main control chip are electrically connected with the capacitor and then grounded.

In one possible implementation manner, the battery backup unit further includes a temperature detection module;

the output end of the temperature detection module is electrically connected with the temperature detection end of the main control chip so as to send the acquired temperature signal to the main control chip.

In one possible implementation, the battery backup unit further includes a communication module;

the communication module comprises a fourteenth resistor, a fifteenth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a first voltage-stabilizing diode and a second voltage-stabilizing diode;

the fourteenth resistor and the twenty-seventh resistor are connected in series between a first port of the communication end of the main control chip and a fourth port of the battery backup unit, a cathode of the first voltage stabilizing diode is electrically connected between the fourteenth resistor and the twenty-seventh resistor, and an anode of the first voltage stabilizing diode is grounded;

the fifteenth resistor and the twenty-eighth resistor are connected between the second port of the communication end of the main control chip and the fifth port of the battery backup unit in series, the cathode of the second voltage stabilizing diode is electrically connected between the fifteenth resistor and the twenty-eighth resistor, and the anode of the first voltage stabilizing diode is grounded;

the fourth port and the fifth port of the battery-backup power supply are electrically connected with the communication port of the electric device as the communication port of the battery-backup unit.

In one possible implementation manner, the battery backup unit further includes a charging display module; the input end of the charging display module is electrically connected with the display control end of the main control chip.

In a possible implementation manner, the system detection end of the main control chip is electrically connected to the sixth port of the battery backup unit through a resistor to receive an interrupt protection signal sent by the electrical equipment

In the present disclosure, the constant current charging module disposed in the battery backup unit can provide a stable charging current for the built-in rechargeable battery during charging, thereby prolonging the service life of the rechargeable battery.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 shows a circuit diagram of a battery backup unit of an embodiment of the present disclosure;

fig. 2 shows a circuit configuration diagram of a constant current charging module according to an embodiment of the disclosure;

FIG. 3 shows a circuit block diagram of a power supply module of an embodiment of the present disclosure;

fig. 4 is a circuit configuration diagram illustrating a constant voltage output module according to an embodiment of the present disclosure;

FIG. 5 is a circuit diagram of a current detection module according to an embodiment of the disclosure;

FIG. 6 shows a circuit configuration diagram of a temperature detection module according to an embodiment of the disclosure;

fig. 7 shows a circuit configuration diagram of a communication module of an embodiment of the present disclosure;

fig. 8 is a circuit configuration diagram of a charging display module according to an embodiment of the disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It will be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing or simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

Fig. 1 shows a circuit diagram of a battery backup unit of an embodiment of the present disclosure. As shown in fig. 1, the battery backup unit includes: the system comprises a constant current charging module 110, a power supply module 120, a main control chip and a rechargeable battery 130. The rechargeable battery 130 may be a single lithium ion battery, or may be a lithium polymer battery, which is not specifically limited herein.

In the present disclosure, the input terminal of the constant current charging module 110 is electrically connected to the first port J1-1 of the battery backup unit to connect an external power supply through the first port J1-1 of the battery backup unit. Wherein, the input voltage range of the external power supply can be 3.8V-6V. The output terminal of the constant current charging module 110 is electrically connected to the second port J1-2 of the battery backup unit to provide a supply voltage to the electric device through the second port J1-2 of the battery backup unit.

In a possible implementation manner, the constant current charging module 110 may be as shown in fig. 2, and specifically includes: the constant current charging control circuit comprises a constant current charging control chip, a first light emitting diode D9, a second light emitting diode D3, a resistor R1, a resistor R3, a resistor R4, a capacitor C2 and a capacitor C3. The model of the constant current charging control chip can be CN3058E.

In this implementation manner, the constant current charging control chip includes a voltage input terminal VIN, a battery connection terminal BAT, a voltage detection terminal FB (i.e., a battery voltage Kelvin detection input terminal), a current setting and detection terminal ISET, a temperature detection terminal TEMP, a first charging indication terminal CHRG, a second charging indication terminal DONE, and a ground terminal.

The voltage input end VIN of the constant current charging control chip is electrically connected with the first port J1-1 of the battery backup unit as the input end of the constant current charging module 110, the battery connection end BAT is electrically connected with the second port J1-2 of the battery backup unit as the output end of the constant current charging module 110, the voltage detection end FB is connected to the battery connection end through a resistor R3, the current setting and detection end ISET is grounded through a resistor R4, the temperature detection end TEMP is grounded, the first charging indication end CHRG and the second charging indication end DONE are electrically connected to the cathodes of the first light emitting diode D9 and the second light emitting diode D3 respectively, the first light emitting diode D9 and the anode of the second light emitting diode D3 are electrically connected and then electrically connected to the first port J1-1 of the battery backup unit through a resistor R1, the voltage input end is electrically connected with the capacitor C2 and then grounded, the battery connection end BAT is electrically connected with the capacitor C3 and then grounded, and the ground of the constant current charging control chip is grounded.

In this implementation, the charging current of the battery-backup unit may be set by resistor R4. For example, in the case where the resistance of the resistor R4 is set to 2.2k Ω, the constant current charging control chip may supply a constant charging current of 5500mA to the battery backup unit in the case where the accessed external input power satisfies the charging condition.

The constant current/constant voltage charging of the charging battery built in the BBU can be realized through the constant current charging module. Specifically, when the input voltage to the voltage input terminal VIN of the constant current charging control chip through the first port J1-1 of the battery backup unit is greater than the power low voltage detection threshold and the voltage of the battery terminal (i.e., the output terminal of the constant current charging module), the constant current charging control chip starts to charge the rechargeable battery, the pin of the first charging indication terminal CHRG outputs a low level, and the first light emitting diode D9 is turned on to indicate that the rechargeable battery is being charged. When the voltage of the voltage detection end FB is lower than 2.5V, the rechargeable battery is precharged by adopting a small current; when the voltage of the voltage detection end FB exceeds 2.5V, the rechargeable battery is charged in a constant current mode, and the charging current is determined by current setting and a resistor R4 between the detection end ISET and GND; when the voltage of the voltage detection terminal FB approaches the terminal voltage of the battery, the charging current is gradually reduced, and the charging of the rechargeable battery is started by adopting a constant voltage mode. When the charging current gradually decreases to the charging end threshold, the charging cycle ends, the first charging indication terminal CHRG outputs a high configuration, the second charging indication terminal DONE outputs a low level, and at this time, the second light emitting diode D3 is turned on to indicate that the charging is ended. When the voltage input through the first port J1-1 of the battery backup unit is powered down or a low voltage is input, the constant current charging module enters a low power consumption sleep mode.

In the present disclosure, the output terminal of the constant current charging module 110 is further connected with a capacitor connected in series, and one end of the capacitor connected in series, which is not connected with the output terminal of the constant current charging module 110, is grounded. For example, the output terminal of the constant current charging module 110 may be connected in series with a capacitor C16 and a capacitor C18. A first end of the capacitor C16 is electrically connected to the output end of the constant current charging module 110, a second end of the capacitor C16 is electrically connected to a first end of the capacitor C18, and a second end of the capacitor C18 is grounded. Wherein, the capacitance of the capacitor C16 and the capacitance of the capacitor C18 may be both 0.1uF.

In the present disclosure, a first end of the power supply module 120 is electrically connected to an output end of the constant current charging module 110, a second end of the power supply module 120 is electrically connected to a positive terminal of the rechargeable battery 130, and a third end of the power supply module 130 is electrically connected to a charge-discharge control terminal of the main control chip, so as to control charging of the rechargeable battery 130 or supply a power supply voltage to the electric device according to a control signal sent by the main control chip.

In a possible implementation manner, the model of the main control chip may be BQ40Z50, where the charge and discharge control terminal of the main control chip includes a PCHG terminal, a DSG terminal, and a CHG terminal.

In this implementation manner, the power supply module 120 may specifically include, as shown in fig. 3: the field effect transistor comprises a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a fourth field effect transistor Q4, a resistor and a capacitor. The first field effect transistor Q1 is a P-type field effect transistor (e.g., FDN 358P), the second field effect transistor Q2 and the third field effect transistor Q3 are N-type field effect transistors (e.g., si7114 DN), and the fourth field effect transistor Q4 is a MOSFET (e.g., 2N 7002K) with a very low turn-on voltage.

In this implementation, the gate of the first fet Q1 is electrically connected to the PCHG terminal of the main control chip through a resistor R23, the gate of the second fet Q2 is electrically connected to the DSG terminal of the main control chip through a resistor R25, and the gate of the third fet Q3 is electrically connected to the CHG terminal of the main control chip through a resistor R18. A resistor R22, a resistor R20 and a resistor R17 are respectively electrically connected among the grid electrodes and the source electrodes of the first field-effect tube Q1, the second field-effect tube Q2 and the third field-effect tube Q3 so as to ensure that the first field-effect tube Q1, the second field-effect tube Q2 and the third field-effect tube Q3 can be completely closed when the driving is not carried out. The source of the second field effect transistor Q2 is electrically connected to the output terminal of the constant current charging module 110 as the first terminal of the power supply module 120. The drain of the second fet Q2 is electrically connected to the drain of the third fet Q3, and the source of the third fet Q3 is electrically connected to the positive terminal of the rechargeable battery 130 as the second terminal of the power supply module 120. Capacitors C14 and C13 connected in series are arranged in parallel between the source electrode of the second field effect transistor Q2 and the source electrode of the third field effect transistor Q3 to protect the second field effect transistor Q2 and the third field effect transistor Q3 when ESD impact occurs. The source of the first field effect transistor Q1 is electrically connected to the drain of the second field effect transistor Q2, and the drain of the first field effect transistor Q1 is electrically connected to the source of the third field effect transistor Q3 through a resistor R21. The gate of the fourth fet Q4 is grounded through the resistor R19, and the source of the fourth fet Q4 is electrically connected to the source of the second fet Q2 (i.e., the output terminal of the constant current charging module 110, and the drain of the fourth fet Q4 is electrically connected to the gate of the second fet Q2.

In this implementation manner, when the main control chip determines that the voltage at the positive terminal of the rechargeable battery is lower than the voltage at the output terminal of the constant current charging module 110 (i.e., the charging condition is satisfied), the DSG terminal and the CHG terminal respectively input high voltages to the gates of the second field-effect transistor Q2 and the third field-effect transistor Q3, so that the second field-effect transistor Q2 and the third field-effect transistor Q3 are turned on, and thus, the rechargeable battery 130 can be charged through the constant current charging module 110. When the voltage at the positive terminal of the rechargeable battery 130 is higher than the voltage at the output terminal of the constant current charging module 110 (i.e., the discharge condition is satisfied), the second fet Q2 and the third fet Q3 are still in a conducting state, and at this time, the rechargeable battery 130 may output the supply voltage to the electric device through a path formed by the second fet Q2 and the third fet Q3. When the main control chip judges that the voltage of the positive terminal of the rechargeable battery 130 is lower than the discharge protection voltage or higher than the charge protection voltage, low voltage is respectively input to the grids of the second field-effect tube Q2 and the third field-effect tube Q3 through the DSG terminal and the CHG terminal, so that the second field-effect tube Q2 and the third field-effect tube Q3 are turned off, overcharge and overdischarge of the rechargeable battery 130 are further prevented, and the service life of the rechargeable battery 130 is prolonged.

In the present disclosure, the main control chip includes a first voltage detection terminal, a second voltage detection terminal, and a power supply terminal. The first voltage detection end is electrically connected with the output end of the constant current charging module 110 through a resistor to collect the output voltage of the constant current charging module 110, and the second voltage detection end is electrically connected with the positive end of the rechargeable battery 130 through a resistor to collect the voltage of the positive end of the rechargeable battery 130, so that the main control chip can control the conduction of the power supply module 120 based on the collected output voltage of the constant current charging module 110 and the collected voltage of the positive end of the rechargeable battery 130 to realize the charging of the rechargeable battery and the power supply of the electric device. The power supply terminal of the main control chip is electrically connected to the positive terminal of the rechargeable battery 130 through a resistor, so as to provide the operating voltage to the main control chip through the rechargeable battery 130.

In an implementation mode of the master control chip model BQ40Z50, a first voltage detection end of the master control chip is a PACK end, a second voltage detection end of the master control chip comprises four second voltage detection ports VC1-VC4, and a power supply end of the master control chip is a BAT end.

In this implementation manner, the first voltage detection terminal PACK of the main control chip is electrically connected to the output terminal of the constant current charging module 110 through the resistor R26. The four second voltage detection ports VC1-VC4 are electrically connected to the positive terminal of the rechargeable battery 130 through the resistor R11. The electric terminal BAT is electrically connected with the positive terminal of the rechargeable battery through a resistor R7. And the four second voltage detection ports VC1-VC4 are electrically connected and then electrically connected with a capacitor C9 and are grounded through the capacitor C9.

In the implementation mode, the FBI terminal of the main control chip is grounded through a capacitor C1, the PWPD terminal, the NC-1 terminal, the VSS terminal, the PTC terminal, the PTCEN terminal, the PUSE terminal, and the NC-2 terminal are all grounded, the VCC terminal is electrically connected to the drain of the second field effect transistor Q2 through a resistor, and the BAT terminal of the main control chip is electrically connected to the positive terminal of the rechargeable battery through a resistor.

In the present disclosure, the negative terminal of the rechargeable battery 130 is grounded through the third port J1-3 of the battery backup unit.

In one possible implementation, in order to provide a stable supply voltage to the electric devices, the battery backup unit further includes a constant voltage output module 140.

In this implementation, the constant voltage output module 140 may be a constant voltage output control chip having a constant voltage output function as shown in fig. 4, for example, a constant voltage output control chip of HX4002B-MFC model.

In this implementation, the constant voltage output module 140 includes a voltage input terminal VIN, an enable terminal EN, a voltage output terminal VOUT, a capacitor positive terminal C +, a capacitor positive terminal C-, and a ground terminal GND.

The voltage input terminal VIN and the enable terminal EN of the constant voltage output module 140 are electrically connected and then electrically connected to the output terminal of the constant current charging module 110 as the input terminal of the constant voltage output module 140. The voltage output end VOUT is electrically connected to the second port J1-2 of the battery backup unit as the output end of the constant voltage output module 140, the capacitor positive end C + and the capacitor positive end C-are electrically connected through a capacitor C6, and the ground end GND is grounded. The input end and the output end of the constant voltage output module 140 are electrically connected to the capacitor and then grounded. It should be noted that in this implementation, the output terminal of the constant current charging module 110 is no longer electrically connected to the second port J1-2 of the battery backup unit.

The constant voltage output module 140 can enable the battery backup unit to output stable 3.3V voltage required by the electric equipment within the power supply voltage range of the rechargeable battery, namely within the range of 2.0V-3.65V, so that the electric equipment can run more stably, and the circuit of the electric equipment can be simplified.

In one possible implementation, the battery backup unit further includes a current detection module 150 to obtain a charging current and a discharging current of the rechargeable battery 130 through the current detection module 150.

In this implementation manner, the current detection module 150 may specifically include, as shown in fig. 5: a resistor R8 (i.e., an eighth resistor), a resistor R9 (i.e., a ninth resistor), a resistor R10 (i.e., a tenth resistor), a capacitor C7 (i.e., a seventh capacitor), a capacitor C15 (i.e., a fifteenth capacitor), and a capacitor C17 (i.e., a seventeenth capacitor).

In an implementation manner of the main control chip model number BQ40Z50, a first end of the resistor R10 is electrically connected to the negative terminal of the rechargeable battery 130, and a second end of the resistor R10 is electrically connected to the third port J1-3 of the battery backup unit. A first terminal of the resistor R8 is electrically connected to a first terminal of the resistor R10, and a second terminal of the resistor R8 is electrically connected to an SRP terminal (i.e., a first port of the current detection terminal) of the main control chip. A first end of the resistor R9 is electrically connected to a second end of the resistor R10, and a second end of the resistor R9 is electrically connected to the SRN terminal (i.e., the second port of the current detection terminal) of the main control chip. And the capacitor C7 is electrically connected between the SRP end and the SRN end of the main control chip. The SRP end of the main control chip is electrically connected with a capacitor C15 and is grounded through the capacitor C15. The SRN end of the main control chip is electrically connected with a capacitor C17 and is grounded through the capacitor C17.

In one possible implementation, the battery backup unit further includes a temperature detection module 160 to sample the operating temperature of the rechargeable battery 130 through the temperature detection module 160.

In this implementation manner, the temperature detecting module 160 may specifically include, as shown in fig. 6: thermistor RT1, thermistor RT2, thermistor RT3, and resistor 29.

In an implementation manner of the main control chip model BQ40Z50, a first end of the thermistor RT1 is grounded, and a second end of the thermistor RT1 is electrically connected to a TS1 end (i.e., a first port of the temperature detection end) of the main control chip as a first output end of the temperature detection module 160. The first terminal of the thermistor RT2 is grounded, and the second terminal is electrically connected to the TS2 terminal of the main control chip (i.e., the second port of the temperature detection terminal) as the second output terminal of the temperature detection module 160. The first end of the thermistor RT3 is grounded, and the second end is electrically connected to the TS3 end of the main control chip (i.e., the third port of the temperature detection end) as the third output end of the temperature detection module 160. The first end of the resistor 29 is grounded, and the second end of the resistor is electrically connected to the BTP end of the main control chip (i.e., the fourth port of the temperature detection end) as the fourth output end of the temperature detection module 160. And the TS4 end and the NC end of the main control chip are grounded.

In one possible implementation, the battery backup unit further includes a communication module 170.

In this implementation manner, the communication module 170 may specifically include, as shown in fig. 7: a resistor R14 (i.e., a fourteenth resistor), a resistor R15 (i.e., a fifteenth resistor), a resistor R27 (i.e., a twenty seventh resistor), a resistor R28 (i.e., a twenty eighth resistor), a first zener diode D1, and a second zener diode D2.

In an implementation mode of the main control chip model number BQ40Z50, the resistor R14 and the resistor R27 are connected in series between the SMBC port (i.e., the first port of the communication terminal) of the main control chip and the fourth port J1-4 of the battery backup unit. The resistor R15 and the resistor R28 are connected in series between the SMBD port (i.e. the second port of the communication terminal) of the main control chip and the fifth port J1-5 of the battery backup unit. The cathode of the first zener diode D1 is electrically connected between the resistor R14 and the resistor R27, and the anode of the first zener diode D1 is grounded. The cathode of the second zener diode D2 is electrically connected between the resistor R15 and the resistor R28, and the anode of the second zener diode D2 is grounded.

The fourth port J1-4 and the fifth port J1-5 of the battery backup power supply are electrically connected with the communication port of the electric equipment as the communication port of the battery backup unit, so that the data information collected by the main control chip can be sent to the electric equipment.

In one possible implementation, the battery backup unit further includes a charging display module 180.

In this implementation manner, the charging display module 180 may specifically include, as shown in fig. 8: light emitting diode D4, light emitting diode D5, light emitting diode D6, light emitting diode D7, and light emitting diode D8.

The cathode of the led D5 is electrically connected to the led ntla terminal of the main control chip (i.e., the first port of the display control terminal of the main control chip), the anode of the led D7 is electrically connected to the cathode of the led D7, and the anode of the led D7 is electrically connected to the led ntlc terminal of the main control chip (i.e., the second port of the display control terminal of the main control chip). The anode of the led D4 is electrically connected to the cathode of the led D5, the cathode is electrically connected to the anode of the led D6, and the anode of the led D6 is electrically connected to the anode of the led D7. The cathode of the led D8 is electrically connected to the cathode of the led D5, and the anode is electrically connected to the anode of the led D7. The led cltlb terminal of the main control chip (i.e. the third port of the display control terminal of the main control chip) is electrically connected to the anode of the light emitting diode D5 and the cathode of the light emitting diode D4. The DISP terminal of the main control chip is grounded through a resistor R13 as a trigger terminal of the charging display module 180.

The charge display module 180 can indicate the SOC and the fault information of the rechargeable battery according to the electrical signal of the control chip.

In a possible implementation manner, the system detection end of the main control chip is electrically connected to the sixth port J1-6 of the battery backup unit through a resistor to receive an interrupt protection signal sent by the electric equipment, and when a fault occurs, a low level is input to the system detection end, and at this time, the main control chip controls the BBU to stop working so as to perform fault protection.

In the present disclosure, the constant current charging module arranged in the battery backup unit can provide stable charging current for the built-in rechargeable battery during charging, so as to improve the service life of the rechargeable battery.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery backup unit, comprising: the device comprises a constant-current charging module, a power supply module, a main control chip and a rechargeable battery;

2. The battery backup unit of claim 1, wherein the constant current charging module comprises: the constant current charging control chip comprises a constant current charging control chip, a first light emitting diode, a second light emitting diode, a resistor and a capacitor;

3. The battery-backup unit of claim 1, wherein the power supply module comprises: the device comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a resistor and a capacitor;

4. The battery-backup unit of claim 1, further comprising a constant voltage output module;

the grounding end of the constant voltage output module is grounded;

5. The battery backup unit of claim 1, wherein the model number of the main control chip is BQ40Z50.

6. The battery-backup unit of claim 5, further comprising a current detection module;

7. The battery-backup unit of claim 5, further comprising a temperature detection module;

8. The battery-backup unit of claim 5, further comprising a communication module;

9. The battery backup unit of claim 5, further comprising a charging display module; the input end of the charging display module is electrically connected with the display control end of the main control chip.

10. The battery backup unit of claim 5, wherein the system detection terminal of the main control chip is electrically connected to the sixth port of the battery backup unit through a resistor to receive the interrupt protection signal sent by the electric device.