Backup power supply system of notebook computer

Abstract

The utility model discloses a notebook computer back-up power supply system which comprises a battery, a charging circuit and a main control circuit, the battery is used for providing power input for the back-up power supply system, the power input end of the charging circuit is electrically connected with the battery, the charging circuit is used for supplying power to a load, and the load detection input end of the main control circuit is connected with the power output end of the charging circuit. The charging control output end of the main control circuit is connected with the power input end of the charging circuit, the load detection input end of the main control circuit is used for detecting whether a load is connected to the charging circuit for charging, and if not, the charging control end of the main control circuit outputs a control signal to control the charging circuit to stop charging. Under the condition of no load, the main control circuit can detect and control the charging circuit to stop charging in time, the standby power consumption of the backup power supply system is reduced, and the energy utilization efficiency is improved; and meanwhile, the battery can be prevented from being in a charging / discharging state for a long time due to automatic shutdown without load, and the aging and loss of the battery are reduced.

Description

Technical Field

[0001] This utility model relates to the field of backup power technology for laptops, and in particular to a backup power system for laptops. Background Technology

[0002] A laptop backup power supply is a device that provides additional power to a laptop computer. It typically has a large capacity and can charge the laptop's battery when it is low, or directly power it, ensuring the laptop can continue to operate while on the go.

[0003] However, existing laptop backup power supplies keep the charging circuit conducting even when the laptop is in standby or off state. This causes the laptop backup power supply to remain working even when there is no load, generating unnecessary static power consumption and reducing overall energy efficiency. At the same time, the long-term conduction of the charging circuit will accelerate battery aging and wear, affecting battery life. Summary of the Invention

[0004] To address the technical problem that current laptop backup power supplies maintain a continuous charging circuit even when the laptop is in standby or off state, resulting in high standby power consumption and short battery life, this invention proposes a laptop backup power supply system.

[0005] A laptop backup power system includes a battery, a charging circuit, and a main control circuit. The battery provides power input to the backup power system. The power input terminal of the charging circuit is electrically connected to the battery and is used to supply power to a load. The load detection input terminal of the main control circuit is connected to the power output terminal of the charging circuit, and the charging control output terminal of the main control circuit is connected to the power input terminal of the charging circuit.

[0006] The load detection input terminal of the main control circuit is used to detect whether the load is connected to the charging circuit for charging. If it is not connected, the charging control terminal of the main control circuit outputs a control signal to control the charging circuit to stop charging.

[0007] The charging circuit includes a laptop charging module, which includes a laptop charging unit and a laptop load detection unit. The power input terminal of the laptop charging unit is electrically connected to the battery, and the laptop charging control input terminal of the laptop charging unit is connected to the first charging control output terminal of the main control circuit.

[0008] The input terminal of the laptop load detection unit is connected to the power output terminal of the laptop charging unit, and the output terminal of the laptop load detection unit is connected to the load detection input terminal of the main control circuit.

[0009] By adopting the above technical solution, the load detection input terminal of the main control circuit will detect in real time whether there is a load connected to the charging circuit for charging. If there is no load connected to the charging circuit, the charging control terminal of the main control circuit will output a control signal to cut off the charging circuit. That is, under no-load conditions, the main control circuit can detect and control the charging circuit to stop charging in time, reducing the standby power consumption of the backup power system and improving energy utilization efficiency. At the same time, this automatic shutdown under no-load conditions can prevent the battery from being in the charging / discharging state for a long time, reducing battery aging and wear.

[0010] Preferably, the charging circuit further includes a USB port charging module and a 12V power supply charging module. The input terminal of the USB port charging module is electrically connected to the battery, the output terminal of the USB port charging module is electrically connected to a USB device, the charging control input terminal of the USB port charging module is connected to the second charging control output terminal of the main control circuit, the input terminal of the 12V power supply charging module is electrically connected to the battery, the output terminal of the 12V power supply charging module is electrically connected to a 12V universal device, and the charging control input terminal of the 12V power supply charging module is connected to the third charging control output terminal of the main control circuit.

[0011] By adopting the above technical solutions, multiple charging voltages can be output to meet the charging needs of different devices; users can also use different charging modules according to the type of device or different usage scenarios, which improves the flexibility and convenience of the backup power system.

[0012] Preferably, the USB port charging module includes a USB charging unit and a USB load detection unit. The power input terminal of the USB charging unit is electrically connected to the battery, and the USB charging control input terminal of the USB charging unit is connected to the second charging control output terminal of the main control circuit. The input terminal of the USB load detection unit is connected to the power output terminal of the USB charging unit, and the output terminal of the USB load detection unit is connected to the load detection input terminal of the main control circuit. The USB load detection unit is used to detect whether a USB load is connected for charging, and when no connection is detected, the main control circuit cuts off the output of the USB charging unit.

[0013] By adopting the above technical solution, it is possible to accurately detect whether a USB device is connected to charging. When it is detected that the USB device is not connected to charging, the charging circuit can be cut off in time, charging can be stopped, power loss can be reduced, and energy utilization efficiency can be improved.

[0014] Preferably, the 12V power charging module includes a 12V charging unit and a 12V load detection unit. The power input terminal of the 12V charging unit is electrically connected to the battery, and the charging control input terminal of the 12V charging unit is connected to the third charging control output terminal of the main control circuit. The input terminal of the 12V load detection unit is connected to the power output terminal of the 12V charging unit, and the output terminal of the 12V load detection unit is connected to the load detection input terminal of the main control circuit. The 12V load detection unit is used to detect whether a 12V general-purpose device is connected for charging, and when no connection is detected, the main control circuit cuts off the output of the 12V charging unit.

[0015] By adopting the above technical solution, it is possible to accurately detect whether a 12V general-purpose device is connected to charging. When it is detected that a 12V general-purpose device is not connected to charging, the charging circuit can be cut off in time, charging can be stopped, power loss can be reduced, and energy utilization efficiency can be improved.

[0016] Preferably, the laptop charging module further includes an output voltage switching unit. The switching signal input terminal of the output voltage switching unit is connected to the switching signal control output terminal of the main control circuit. The output voltage switching unit is used to perform a charging voltage switching operation when it receives a voltage switching signal from the main control circuit.

[0017] By adopting the above technical solution, the output voltage switching unit can switch between multiple charging voltage levels, which can meet the charging needs of the laptop under different load conditions and improve charging efficiency. Secondly, it can switch the appropriate charging voltage according to the load current of the laptop, which can meet the fast charging needs of the laptop on the one hand, and prevent overcurrent damage to the laptop and battery on the other hand.

[0018] Preferably, it further includes a battery management circuit, which is electrically connected to the battery and is used to provide over-discharge protection and overcharge protection for the battery.

[0019] Preferably, the battery management circuit includes a step-down module and a battery protection module. The input terminal of the step-down module is electrically connected to the battery, and the output terminal of the step-down module is used to step down the charging voltage of the battery to 5V. The battery protection module is electrically connected to the battery, and the power control input terminal of the battery protection module is connected to the power control output terminal of the main control circuit to provide over-discharge protection and overcharge protection for the battery.

[0020] By adopting the above technical solution, on the one hand, the high voltage of the battery can be converted into a stable 5V voltage output to meet the power supply needs of different devices and improve the adaptability of the power supply. On the other hand, it provides over-discharge protection and over-charge protection for the battery, ensuring that the backup power system can operate stably under various working conditions and reducing system failures caused by battery problems.

[0021] Preferably, the step-down module includes a linear regulator U9 and a diode D1. The output terminal of the battery is connected to the positive terminal of the diode D1, the negative terminal of the diode D1 is connected to the input terminal of the linear regulator U9, and the output terminal of the linear regulator U9 is connected to the power supply terminal of the main control circuit 300.

[0022] Preferably, the battery protection module includes an overvoltage detection unit, an overcurrent detection unit, and a protection unit. The input terminal of the overvoltage detection unit is electrically connected to the battery, and the output terminal of the overvoltage detection unit is connected to the overvoltage detection input terminal of the main control circuit. The input terminal of the overcurrent detection unit is connected to the negative terminal of the battery, and the output terminal of the overcurrent detection unit is connected to the overcurrent detection input terminal of the main control circuit. The protection unit is electrically connected to the battery, and the charge / discharge control terminal of the protection unit is connected to the charge / discharge control terminal of the main control circuit. The protection unit is used to cut off the battery output when the battery is over-discharged and / or overcharged.

[0023] By adopting the above technical solutions, it is possible to quickly respond to various abnormal states of the battery, promptly cut off the charging and discharging circuit, prevent battery damage or safety accidents, and also enable precise management of the battery charging and discharging process, thereby improving battery efficiency and safety.

[0024] Preferably, it also includes a power display circuit, the input terminal of which is connected to the power display terminal of the main control circuit, and the power display circuit is used to display the current power of the backup power system.

[0025] By adopting the above technical solution, the current power level of the backup power system can be displayed in real time, allowing users to intuitively understand the remaining power of the device, making it easier to determine whether the battery needs to be charged, and avoiding the inability of the battery to charge other devices due to insufficient power, which would affect the user experience.

[0026] Compared with the prior art, the notebook backup power system proposed in this utility model has the following advantages:

[0027] 1. The main control circuit proposed in this utility model can detect in real time whether there is a load connected to the charging circuit. If there is no load connected to the charging circuit, the main control circuit will output a control signal to cut off the charging circuit. That is, under no-load conditions, the main control circuit can detect and control the charging circuit to stop charging in time, reducing the standby power consumption of the backup power system and improving energy utilization efficiency. At the same time, this automatic shutdown under no-load conditions can prevent the battery from being in the charging / discharging state for a long time, reducing battery aging and wear. Attached Figure Description

[0028] Figure 1This is a circuit structure block diagram of the present invention;

[0029] Figure 2 This is a partial circuit diagram of the USB charging module of this utility model;

[0030] Figure 3 This is a partial circuit diagram of the laptop charging module of this utility model;

[0031] Figure 4 This is a partial circuit diagram of the 12V power charging module of this utility model;

[0032] Figure 5 This is a partial circuit diagram of the battery protection module of this utility model;

[0033] Figure 6 This is a partial circuit diagram of the step-down module of this utility model;

[0034] Figure 7 This is a partial circuit diagram of the power display circuit of this utility model. Detailed Implementation

[0035] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0036] In one embodiment, such as Figures 1 to 7 As shown, this utility model discloses a backup power system for a laptop, including a battery 100, a charging circuit 200, and a main control circuit 300. The battery 100 provides power input to the backup power system. The power input terminal of the charging circuit 200 is electrically connected to the battery 100, and the charging circuit 200 is used to charge the load. The load detection input terminal of the main control circuit 300 is connected to the power output terminal of the charging circuit 200, and the charging control output terminal of the main control circuit 300 is connected to the power input terminal of the charging circuit 200.

[0037] The load detection input terminal of the main control circuit 300 is used to detect whether the load is connected to the charging circuit 200 for charging. If it is not connected, the charging control terminal of the main control circuit 300 outputs a control signal to control the charging circuit 200 to stop charging.

[0038] Among them, the situation where the load is not connected includes the load being fully charged or the load being unplugged midway.

[0039] In this embodiment, the load detection input of the main control circuit will detect in real time whether there is a load connected to the charging circuit for charging. If there is no load connected to the charging circuit, the charging control output of the main control circuit will output a control signal to cut off the charging circuit. That is, under no-load conditions, the main control circuit can detect and control the charging circuit to stop charging in time, reducing the standby power consumption of the backup power system and improving energy utilization efficiency. At the same time, this automatic shutdown under no-load conditions can prevent the battery from being in the charging / discharging state for a long time, reducing battery aging and wear.

[0040] Furthermore, as a preferred embodiment of this solution and not a limitation, the battery 100 may include, but is not limited to, a combination of 6 polymer lithium batteries in a three-series-three-parallel configuration or a combination of 8 polymer lithium batteries in a four-series-four-parallel configuration. In this embodiment, the battery 100 is preferably a combination of 6 polymer lithium batteries in a three-series-three-parallel configuration, but in specific implementation, a suitable battery may be selected according to actual design requirements.

[0041] The battery 100 can provide a 16V input voltage for the backup power system.

[0042] Furthermore, as a preferred embodiment of this solution and not a limitation, the charging circuit 200 includes a USB port charging module 210, a laptop charging module 220, and a 12V power supply charging module 230. The input terminal of the laptop charging module 220 is electrically connected to the battery 100, the output terminal of the laptop charging module 220 is electrically connected to a laptop device, and the charging control input terminal of the laptop charging module 220 is connected to the first charging control output terminal of the main control circuit 300. The input terminal of the USB port charging module 210 is electrically connected to the battery 100, the output terminal of the USB port charging module 210 is electrically connected to a USB device, and the charging control input terminal of the USB port charging module 210 is connected to the second charging control output terminal of the main control circuit 300. The input terminal of the 12V power supply charging module 230 is electrically connected to the battery 100, the output terminal of the 12V power supply charging module 230 is electrically connected to a 12V universal device, and the charging control input terminal of the 12V power supply charging module 230 is connected to the third charging control output terminal of the main control circuit 300.

[0043] The USB devices include, but are not limited to, devices that use USB charging ports, such as mobile phones, smart bracelets, and headphones. The 12V universal devices include, but are not limited to, devices that require a 12V power supply for charging, such as monitors and routers.

[0044] In this embodiment, the charging circuit can output multiple charging voltages to meet the charging needs of different devices; users can also use different charging modules according to the type of device or different usage scenarios, which improves the flexibility and convenience of the backup power system.

[0045] In a preferred embodiment, the USB port charging module 210 includes a USB charging unit 211 and a USB load detection unit 212. The power input terminal of the USB charging unit 211 is electrically connected to the battery 100, and the USB charging control input terminal of the USB charging unit 211 is connected to the second charging control output terminal of the main control circuit 300. The input terminal of the USB load detection unit 212 is connected to the power output terminal of the USB charging unit 211, and the output terminal of the USB load detection unit 212 is connected to the load detection input terminal of the main control circuit 300.

[0046] The USB load detection unit 212 is used to detect whether the USB load is connected for charging, and when it is not connected, the main control circuit 300 cuts off the output of the USB charging unit.

[0047] Alternatively, the USB charging unit 211 includes a DC-DC converter chip U1, a power port USB1, a switching transistor Q11, a transistor Q13, a diode D5, an inductor L2, resistors R28, R33, R47, and R48. The second charging control output terminal of the main control circuit 300 (i.e., the USB-SW terminal in this embodiment) is connected to one end of the resistor R28, and the other end of the resistor R28 is connected to the controlled terminal (i.e., the base) of the transistor Q13. The second conducting terminal (i.e., the emitter) of the transistor Q13 is grounded, and the first conducting terminal (i.e., the collector) of the transistor Q13 is connected to one end of the resistor R33. The other end of the resistor R33 is connected to the controlled terminal (i.e., the gate) of the switching transistor Q11. The battery 1 00 is connected to the first conducting terminal (i.e., source) of the switching transistor Q11, the second conducting terminal (i.e., drain) of the switching transistor Q11 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to one end of the resistor R48, the other end of the resistor R48 is connected to the power supply terminal (i.e., the VDD terminal in this embodiment) of the DC-DC converter chip U1, the cathode of the diode D5 is also connected to one end of the resistor R47, the other end of the resistor R47 is connected to the input terminal (i.e., the ISEN terminal in this embodiment) of the DC-DC converter chip U1, the output terminal (i.e., the ISWE terminal in this embodiment) of the DC-DC converter chip U1 is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to the power port USB1.

[0048] Preferably, the DC-DC converter chip U1 is model AP34063. In specific implementations, other models with the same function can also be used instead of the DC-DC converter chip U1.

[0049] In this embodiment, the DC-DC converter chip AP34063 is a monolithic DC-DC converter integrated circuit. It integrates a temperature-compensated reference voltage source (1.25V), a comparator, an oscillator that can effectively limit current and control the duty cycle, and a switch that can output a large current of 1.6A. It can be used for boosting, bucking, or voltage inversion. This embodiment mainly utilizes the bucking capability of the DC-DC converter chip to convert the 16V input voltage of the battery into a 5V output voltage so that it can be used to charge USB devices.

[0050] Alternatively, the USB load detection unit 212 includes an operational amplifier U5A, resistors R10, R12, and R63. The power output terminal of the USB charging unit 211 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the non-inverting input terminal (i.e., the 1+ terminal in this embodiment) of the operational amplifier U5A. The inverting input terminal (i.e., the 1- terminal in this embodiment) of the operational amplifier U5A is connected to ground via the resistor R63. The non-inverting output terminal of the operational amplifier U5A is connected to the load detection input terminal (i.e., the V358 terminal in this embodiment) of the main control circuit 300, and the inverting output terminal of the operational amplifier U5A is connected to the USB load current detection terminal (i.e., the USBI terminal in this embodiment) of the main control circuit 300.

[0051] Specifically, when a USB device is plugged into the power port USB1 for charging, the 16V DC voltage output by the battery is filtered by the switching transistor Q11 and the diode D5 to remove power noise and provide a stable power supply voltage for the DC-DC converter chip U1. The DC-DC converter chip U1 converts the 16V DC voltage into a 5V output voltage. The converted 5V output voltage is smoothed by the inductor L2 and then output to the power port USB1 to charge the USB device. The non-inverting input of operational amplifier U5A is connected to the output of power port USB1 to detect whether a USB device is connected for charging. The inverting input of operational amplifier U5A is grounded through resistor R63 to form a reference voltage. If the USB device is fully charged or unplugged midway, the output voltage of the non-inverting input of operational amplifier U5A will be higher than the voltage of the inverting input (i.e., the reference voltage), resulting in a high-level output. After the load detection input (V358 terminal) of the main control circuit receives the high-level signal output by operational amplifier U5A, the second charging control output (USB-SW terminal) of the main control circuit will output a second charging control signal. After receiving the second charging control signal, the controlled terminal of transistor Q13 will conduct, thereby lowering the conduction voltage of switching transistor Q11 and turning off switching transistor Q11, thus cutting off the charging circuit of USB port charging unit 211.

[0052] In addition, when the USB device is charging, the operational amplifier U5A is also used to collect the feedback current of the power port USB1. The operational amplifier U5A amplifies the collected feedback signal and outputs it to the main control circuit. After receiving the feedback current signal, the USB load current detection terminal (USB1 terminal) of the main control circuit will compare it with the preset charging limit current. If it is greater than the limit charging current, the first charging control terminal (USB-SW terminal) of the main control circuit will also output the second charging control signal, control the transistor Q13 to conduct and the switching transistor Q11 to be cut off, thus cutting off the charging circuit of the USB port charging unit.

[0053] The preset charging current limit is 500mA.

[0054] In this embodiment, the main control circuit can accurately detect whether the USB device is connected to charging through the voltage comparison function of the operational amplifier U5A. When it is detected that the USB device is not connected to charging, the charging circuit can be cut off in time to stop charging, reduce power loss, and improve energy utilization efficiency. At the same time, the operational amplifier U5A is also used to collect the feedback current of the power port USB1 to detect whether any abnormalities occur during the charging process of the USB device, such as the charging current exceeding the charging limit current. In the event of an abnormality, the main control circuit can cut off the charging circuit in time to protect the USB device and the backup power system and avoid damage.

[0055] In a preferred embodiment, the laptop charging module 220 includes a laptop charging unit 221, a laptop load detection unit 222, and an output voltage switching unit 223. The power input terminal of the laptop charging unit 221 is electrically connected to the battery 100, and the laptop charging control input terminal of the laptop charging unit 221 is connected to the first charging control output terminal of the main control circuit 300. The input terminal of the laptop load detection unit 222 is connected to the power output terminal of the laptop charging unit 221, and the output terminal of the laptop load detection unit 222 is connected to the load detection input terminal of the main control circuit 300. The laptop load detection unit 222 is used to detect whether the laptop load is connected for charging, and when it is detected that it is not connected, the main control circuit 300 cuts off the output of the laptop charging unit 221. The switching signal input terminal of the output voltage switching unit 223 is connected to the switching signal control output terminal of the main control circuit 300, and the output voltage switching unit 223 is used to perform a charging voltage switching operation when it receives a voltage switching signal from the main control circuit 300.

[0056] Alternatively, the laptop charging unit 221 includes a laptop power port DCOUT1, a boost controller U3, switching transistors Q10 and U7, transistors Q5, Q6, Q7, and Q16, a diode D13, resistors R22, R31, R26, R67, R68, and R69, and capacitors C25 and C27. The first charging control output terminal of the main control circuit 300 (i.e., the HDC-SW terminal in this embodiment) is connected to one end of resistor R31, and the other end of resistor R31 is connected to the controlled terminal (i.e., the base) of transistor Q6. The second conducting terminal (i.e., the emitter) of transistor Q6 is grounded. The conducting terminal (i.e., collector) of the switching transistor Q10 is connected to the controlled terminal (i.e., gate) of the switching transistor Q10. The battery 100 is connected to the first conducting terminal (i.e., source) of the switching transistor Q10. The second conducting terminal (i.e., drain) of the switching transistor Q10 is connected to one end of the resistor R22. The other end of the resistor R22 is connected to the controlled terminal (i.e., base) of the transistor Q5. The second conducting terminal (i.e., drain) of the switching transistor Q10 is also connected to the first conducting terminal (i.e., collector) of the transistor Q5. The second conducting terminal (i.e., emitter) of the transistor Q5 is connected to the input terminal (i.e., the VCC terminal in this embodiment) of the boost controller U3. The voltage acquisition terminal (i.e., the HFB terminal in this embodiment) of the notebook load detection unit 222 is connected to the voltage acquisition terminal. The voltage feedback terminal (FB terminal in this embodiment) of the boost controller U3 is connected to the voltage feedback terminal of the boost controller U3. The error amplifier output terminal (CMOP terminal in this embodiment) of the boost controller U3 is connected to ground via capacitor C25. The oscillation signal terminal (OSC terminal in this embodiment) of the boost controller U3 is connected to ground via an RC oscillation unit, which consists of resistor R69 and capacitor C27 connected in parallel. The output terminal (OUT terminal in this embodiment) of the boost controller U3 is connected to one end of resistor R68, and the other end of resistor R68 is connected to the controlled terminal (base) of transistor Q7. The second conducting terminal of the switching transistor Q10 is also connected to the first conducting terminal of transistor Q7. The collector of transistor Q7 is connected to the emitter of transistor Q16. The other end of resistor R68 is connected to the base of transistor Q16. The collector of transistor Q16 is grounded. The common point connecting the second collectors of transistor Q7 and Q16 is connected to the gate of switch U7. The drain of switch U7 is grounded. The source of switch U7 is connected to the anode of diode D13. The cathode of diode D13 is connected to the DCOUT1 power port of the laptop.

[0057] Preferably, the boost controller U3 is model FP5138. In specific implementations, other models with the same function can also be used instead of the boost controller U3.

[0058] In this embodiment, the boost controller FP5138 is a boost controller IC applied to batteries. It has a built-in high-precision reference voltage, output voltage for the comparison feedback amplifier, maximum duty cycle control, and programmable soft start. The boost controller FP5138 has short-circuit protection and operating mode control between operating mode and standby mode. In this embodiment, the boost controller FP5138 controls the on and off times of external switching transistors (such as transistors Q7, Q16, and U7) through PWM signals, thereby achieving different output charging voltages.

[0059] Alternatively, the laptop load detection unit 222 includes an operational amplifier U4A, a diode D7, resistors R9, R11, and R75. The power output terminal of the laptop charging unit 221 is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to the non-inverting input terminal (i.e., the 1+ terminal in this embodiment) of the operational amplifier U4A. The inverting input terminal (i.e., the 1- terminal in this embodiment) of the operational amplifier U4A is connected to ground via the resistor R75. The non-inverting output terminal of A is connected to the load detection input terminal of the main control circuit 300 (i.e., the V358 terminal in this embodiment). The inverting output terminal of the operational amplifier U4A is connected to one end of the resistor R9. The other end of the resistor R9 is connected to the notebook load current detection terminal of the main control circuit 300 (i.e., the HDCI terminal in this embodiment). The inverting output terminal of the operational amplifier U4A is also connected to the positive terminal of the diode D7. The negative terminal of the diode D7 is connected to the voltage feedback terminal of the notebook charging unit 221.

[0060] Specifically, when the laptop device is plugged into the laptop power port DCOUT1, the 16V DC voltage output by the battery is filtered by the switching transistor Q10 and the transistor Q5 to remove power noise and provide a stable power supply voltage for the boost controller U3. The error amplifier terminal (CMOP terminal) of the boost controller U3 monitors the voltage feedback signal received by the voltage feedback terminal (FB terminal) in real time, compares it with the internal reference voltage, and generates an error signal. The oscillation signal terminal (OSC terminal) of the boost controller U3 compares the error signal with the sawtooth wave signal generated by the internal oscillator and outputs a PWM signal. The PWM signal output by the output terminal (OUT terminal) of the boost controller controls the conduction and / or cutoff of transistors Q7 and Q16, so that the switching transistor U7 has different conduction voltages, thereby realizing different charging voltages. The non-inverting input of operational amplifier U4A is connected to the output of the laptop power port DCOUT1 to detect whether a laptop device is connected for charging at the laptop power port DCOUT1. The inverting output of operational amplifier U4A is grounded through resistor R75 to form a reference voltage. If the laptop device is fully charged or unplugged midway, the output voltage of operational amplifier U4A will be higher than the voltage of the inverting input (i.e., the reference voltage), and the output will be high. After the load detection input terminal (V358 terminal) of the main control circuit receives the high-level signal output by operational amplifier U4A, the first charging control terminal (HDC-SW terminal) of the main control circuit will output the first charging control signal. After receiving the first charging control signal, the controlled terminal of transistor Q6 will conduct, thereby pulling down the conduction voltage of switching transistor Q10, causing switching transistor Q10 to be cut off, thus cutting off the charging circuit of the laptop charging unit.

[0061] In addition, when the laptop is charging, the operational amplifier U4A is also used to collect the load current of the laptop power port DCOUT1. The operational amplifier U4A amplifies the collected load current signal and outputs it to the main control circuit. After receiving the amplified load current signal, the laptop load current detection terminal (i.e., HDCI terminal) of the main control circuit will determine whether the load current exceeds 5A. If it does, the first charging control output terminal (HDC-SW terminal) of the main control circuit will also output the first charging control signal, controlling the transistor Q6 to conduct and the switching transistor Q10 to cut off, thus cutting off the charging circuit of the laptop charging unit.

[0062] In this embodiment, the main control circuit can accurately detect whether the laptop is connected to charging through the voltage comparison function of the operational amplifier U4A. When it is detected that the laptop is not connected to charging, the charging circuit can be cut off in time to stop charging, reduce computer wear and tear, and improve energy efficiency. At the same time, the operational amplifier U4A is also used to collect the feedback current of the laptop power port DCOUT1 to detect whether the load current of the laptop exceeds the rated 5A during the charging process. If it does, the main control circuit can cut off the charging circuit in time to protect the laptop and the backup power system and avoid damage.

[0063] Alternatively, the output voltage switching unit 223 includes switching transistors Q17, Q18, and Q19, resistors R73, R74, and R77. The first switching signal control terminal of the main control circuit 300 (i.e., the DC16V terminal in this embodiment) is connected to the controlled terminal (i.e., the gate) of the switching transistor Q17. The first conducting terminal (i.e., the source) of the switching transistor Q17 is connected to one end of the resistor R73. The second conducting terminal (i.e., the drain) of the switching transistor Q17 is connected to ground. The second switching signal control terminal of the main control circuit 300 (i.e., the DC19V terminal in this embodiment) is connected to the controlled terminal (i.e., the gate) of the switching transistor Q18. The first conducting terminal (i.e., source) of the switching transistor Q18 is connected to one end of the resistor R74, the second conducting terminal (i.e., drain) of the switching transistor Q18 is connected to ground, the third switching signal control terminal of the main control circuit 300 (i.e., the DC22V terminal in this embodiment) is connected to the controlled terminal (i.e., gate) of the switching transistor Q19, the first conducting terminal (i.e., source) of the switching transistor Q19 is connected to one end of the resistor R77, the second conducting terminal (i.e., drain) of the switching transistor Q19 is grounded, and the common connection point of the other end of the resistor R73, the other end of the resistor R74, and the other end of the resistor R77 is connected to the voltage feedback terminal of the laptop charging unit 221.

[0064] Specifically, when the laptop is plugged in for charging, the first switching signal control terminal (DC16V terminal) of the main control circuit 300 will output the first switching control signal. After receiving the first switching control signal, the controlled terminal of transistor Q17 will conduct. At this time, the voltage feedback terminal (FB terminal) of the boost controller will also receive the first switching control signal transmitted after transistor Q17 conducts. The output terminal (OUT terminal) of the boost controller will output the first PWM signal, so that a 16V charging voltage is output to the laptop. During charging, if the load current collected by the operational amplifier U4A is greater than 1A, the laptop device will maintain a charging voltage of 16V. If it is less than 1A, the first switching signal control terminal (DC16V terminal) of the main control circuit 300 will stop outputting, and the second switching signal control terminal (DC19V terminal) of the main control circuit 300 will output a second switching control signal. Transistor Q17 will be cut off, and the controlled terminal of transistor Q18 will be turned on after receiving the second switching control signal. The voltage feedback terminal (FB terminal) of the boost controller will receive the second switching control signal transmitted after transistor Q18 is turned on. The output terminal (OUT terminal) of the boost controller will output a second PWM signal, so that a 19V charging voltage is output to the laptop device. Operational amplifier U4A continuously monitors the load current. If the detected load current is greater than 1A, the laptop maintains a 19V charging voltage. If it is less than 1A, the second switching signal control terminal (DC19V terminal) of the main control circuit 300 stops outputting, and the third switching signal control terminal (DC22V terminal) of the main control circuit 300 outputs a third switching control signal. Transistor Q18 is cut off, and the controlled terminal of transistor Q19 turns on after receiving the third switching control signal. The voltage feedback terminal (FB terminal) of the boost controller receives the third switching control signal transmitted after transistor Q19 turns on, and the output terminal (OUT terminal) of the boost controller outputs a third PWM signal, thereby outputting a 22V charging voltage to the laptop.

[0065] In this embodiment, the output voltage switching unit can have three charging voltage switching levels (16V, 19V and 22V), which can meet the charging needs of the laptop device under different load conditions and improve charging efficiency. Secondly, it can switch the appropriate charging voltage according to the load current of the laptop device, which can meet the fast charging needs of the laptop device on the one hand, and prevent overcurrent damage to the laptop device and battery on the other hand.

[0066] In a preferred embodiment, the 12V power charging module 230 includes a 12V charging unit 231 and a 12V load detection unit 232. The power input terminal of the 12V charging unit 231 is electrically connected to the battery 100, and the charging control input terminal of the 12V charging unit 231 is connected to the third charging control output terminal of the main control circuit 300. The input terminal of the 12V load detection unit 232 is connected to the power output terminal of the 12V charging unit 231, and the output terminal of the 12V load detection unit 232 is connected to the load detection input terminal of the main control circuit 300.

[0067] Alternatively, the 12V charging unit 231 includes a step-down regulator U8, a 12V power port DCOUT2, switching transistors Q12 and Q20, a transistor Q14, an inductor L4, resistors R32, R46, and R79. The third charging control output terminal of the main control circuit 300 (i.e., the LDC-SW terminal in this embodiment) is connected to one end of resistor R32, and the other end of resistor R32 is connected to the controlled terminal (i.e., the base) of transistor Q14. The second conducting terminal (i.e., the emitter) of transistor Q14 is grounded, and the first conducting terminal (i.e., the collector) of transistor Q14 is connected to one end of resistor R46. The other end of resistor R46 is connected to the controlled terminal (i.e., the gate) of switching transistor Q12. The battery 100 is connected to the first conducting terminal (i.e., the source) of switching transistor Q12. The second conducting terminal (drain) of the switching transistor Q12 is connected to the input terminal (VIN terminal in this embodiment) and the enable terminal (EN terminal in this embodiment) of the buck regulator U8, respectively. The buck control signal terminal (DC10V terminal in this embodiment) of the main control circuit 300 is connected to the controlled terminal (gate) of the switching transistor Q20. The second conducting terminal (drain) of the switching transistor Q20 is grounded. The first conducting terminal (source) of the switching transistor Q20 is connected to one end of the resistor R79. The other end of the resistor R79 is connected to the voltage feedback terminal (FB terminal in this embodiment) of the buck regulator U8. The output terminal (LX terminal in this embodiment) of the buck regulator U8 is connected to one end of the inductor L4. The other end of the inductor L4 is connected to the 12V power supply port DCOUT2.

[0068] Preferably, the buck regulator U8 is model FP6115. In specific implementation, other models with the same function can also be used instead of buck regulator U8.

[0069] In this embodiment, the buck regulator FP6115 is a buck switching regulator that controls the frequency of the PWM signal through an internal oscillator to adjust the output voltage. The buck regulator FP6115 in this embodiment can convert the 16V input voltage of the battery into a 12V output voltage so that it can be used to charge 12V general-purpose devices.

[0070] Alternatively, the 12V load detection unit 232 includes an operational amplifier U4B, resistors R16, R17, and R76. The power output terminal of the 12V charging unit 231 is connected to one end of the resistor R17, and the other end of the resistor R17 is connected to the non-inverting input terminal (i.e., the 2+ terminal in this embodiment) of the operational amplifier U4B. The inverting input terminal (i.e., the 2- terminal in this embodiment) of the operational amplifier U4B is connected to ground via the resistor R76. The output terminal of the operational amplifier U4B is connected to one end of the resistor R16, and the other end of the resistor R16 is connected to the 12V load current detection terminal (i.e., the LDCI terminal in this embodiment).

[0071] Specifically, when a 12V general-purpose device is connected to the 12V power port DCOUT2 for charging, the 16V DC voltage output by the battery will be filtered by the switching transistor Q12 to remove power supply noise and provide a stable power supply voltage for the buck regulator U8. The buck regulator U8 will convert the 16V DC voltage into a 12V output voltage. The converted 12V output voltage is smoothed by the inductor L4 and then output to the 12V power port DCOUT2 to charge the 12V general-purpose device. The non-inverting input of operational amplifier U4B is connected to the output of 12V power port DCOUT2 to detect whether a 12V general-purpose device is connected for charging at 12V power port DCOUT2. The inverting input of operational amplifier U4B is grounded through resistor R76 to form a reference voltage. If the 12V general-purpose device is fully charged or disconnected midway, the output voltage of the non-inverting input of operational amplifier U4B will be higher than the voltage of the inverting input (i.e., the reference voltage), resulting in a high-level output. After the 12V load detection input (LDCI terminal) of the main control circuit receives the high-level signal output by operational amplifier U4B, the third charging control output (LDC-SW terminal) of the main control circuit will output a third charging control signal. After receiving the third charging control signal, the controlled terminal of transistor Q14 will conduct, thereby lowering the conduction voltage of switching transistor Q12, causing switching transistor Q12 to turn off, thus cutting off the charging circuit of 12V charging unit 231.

[0072] In this embodiment, the main control circuit can accurately detect whether a 12V general-purpose device is connected to charging through the voltage comparison function of the operational amplifier U4B. When it is detected that a 12V general-purpose device is not connected to charging, the charging circuit can be cut off in time to stop charging, reduce power loss, and improve energy utilization efficiency.

[0073] Furthermore, as a preferred embodiment of this solution and not a limitation, the main control circuit 300 includes a main control chip U6. Preferably, the main control chip U6 is model HT66F40. In specific implementations, other models with the same function can also be used for the main control chip U6.

[0074] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a battery management circuit 400, which is electrically connected to the battery 100 and is used to provide over-discharge protection and overcharge protection for the battery 100.

[0075] Specifically, the battery management circuit 400 includes a step-down module 410 and a battery protection module 420. The input terminal of the step-down module 410 is electrically connected to the battery 100, and the output terminal of the step-down module 410 is used to step down the charging voltage of the battery 100 to 5V, providing a 5V power input to the main control circuit 300. The battery protection module 420 is electrically connected to the battery 100, and the power control input terminal of the battery protection module 420 is connected to the power control output terminal of the main control circuit 300, used to cut off the output of the battery 100 when the battery 100 is over-discharged and / or overcharged.

[0076] In a preferred embodiment, the step-down module 410 includes a linear regulator U9 and a diode D1. The output terminal of the battery 100 is connected to the positive terminal of the diode D1, the negative terminal of the diode D1 is connected to the input terminal of the linear regulator U9, and the output terminal of the linear regulator U9 is connected to the power supply terminal (i.e., the VDD terminal in this embodiment) of the main control circuit 300.

[0077] Preferably, the linear regulator U9 is model HT7550. In specific implementation, other linear regulators with the same function can also be used instead of the linear regulator U9.

[0078] In this embodiment, the linear regulator U9 is a low-power linear regulator that converts the 16V input voltage provided by the battery into a stable 5V output voltage, thereby providing the startup voltage for the main control circuit. The linear regulator U9 can maintain a stable output voltage under different temperature conditions or when the input voltage fluctuates, ensuring the normal operation of the main control circuit. Furthermore, the 5V output voltage converted by the linear regulator U9 can also be used in other chips or startup circuits in the backup power system that require 5V.

[0079] In a preferred embodiment, the battery protection module 420 includes an overvoltage detection unit 421, an overcurrent detection unit 422, and a protection unit 423. The input terminal of the overvoltage detection unit 421 is electrically connected to the battery 100, and the output terminal of the overvoltage detection unit 421 is connected to the overvoltage detection input terminal of the main control circuit 300. The input terminal of the overcurrent detection unit 422 is connected to the negative terminal of the battery 100, and the output terminal of the overcurrent detection unit 422 is connected to the overcurrent detection input terminal of the main control circuit 300. The charge / discharge control terminal of the protection unit 423 is connected to the charge / discharge control terminal of the main control circuit 300, and the protection unit 423 is electrically connected to the battery 100. The protection unit 423 is used to provide over-discharge protection and overcharge protection for the battery.

[0080] Alternatively, the overvoltage detection unit 421 includes resistors R7 and R19. The output terminal of the battery 100 is connected to one end of the resistor R19, the other end of the resistor R19 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the overvoltage detection input terminal (i.e., the BTV terminal in this embodiment) of the main control circuit 300.

[0081] In this embodiment, the output voltage of battery 100 can be accurately detected by the voltage divider circuit of resistors R7 and R19. When the battery voltage exceeds the preset threshold, the voltage after voltage division will trigger the overvoltage protection mechanism of the main control circuit 300, thereby cutting off the circuit in time and preventing overvoltage from damaging the equipment.

[0082] Alternatively, the overcurrent detection unit 422 includes a resistor R35 and a capacitor C16. The negative terminal of the battery 100 is connected to one end of the resistor R35, and the other end of the resistor R35 is connected to one end of the capacitor C16. The other end of the capacitor C16 is connected to ground. The common connection point of the resistor R35 and the capacitor C16 is connected to the overcurrent detection input terminal (i.e., the BTI terminal in this embodiment) of the main control circuit 300.

[0083] In this embodiment, the output current of battery 100 can be accurately detected by the combination of resistor R35 and capacitor C16. When the current exceeds the preset threshold, the voltage drop across resistor R35 will trigger the overcurrent protection mechanism of main control circuit 300, thereby cutting off the circuit in time and preventing overcurrent from damaging the device.

[0084] Alternatively, the protection unit 423 includes a protection chip U2, transistors Q3, Q4, and Q15, a switching transistor Q1, a switching assembly, resistors R5, R18, R20, R21, R30, R36, R58, R61, and R62. The output terminal of the battery 100 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the controlled terminal (i.e., base) of transistor Q4. The other end of resistor R5 is also connected to the controlled terminal (i.e., base) of transistor Q15. The first conducting terminal (i.e., collector) of transistor Q4 is connected to the first conducting terminal (i.e., source) of the switching transistor Q1, and the second conducting terminal (i.e., emitter) of transistor Q4 is connected to the... The second conducting terminal (i.e., emitter) of transistor Q15 is connected, the second conducting terminal of transistor Q4 is connected to one end of resistor R18, the other end of resistor R18 is connected to the controlled terminal (i.e., gate) of switching transistor Q1, the first conducting terminal (i.e., collector) of transistor Q15 is grounded, the other end of resistor R5 is also connected to one end of resistor R58, the other end of resistor R58 is connected to the first conducting terminal (i.e., collector) of transistor Q3, the charge / discharge control terminal of the main control circuit (i.e., the PWM terminal in this embodiment) is connected to one end of resistor R30, the other end of resistor R30 is connected to the controlled terminal (i.e., base) of transistor Q3, and the second conducting terminal (i.e., emitter) of transistor Q3 is grounded;

[0085] The output terminal of the battery 100 is also connected to the first conducting terminal (i.e., the source) of the switching transistor Q1. The second conducting terminal (i.e., the drain) of the switching transistor Q1 is connected to the input terminal of the switching assembly. The second conducting terminal of the switching transistor Q1 is also connected to the signal receiving terminal (i.e., the VMP terminal in this embodiment) of the protection chip U2. The charging control terminal (i.e., the COP terminal in this embodiment) of the protection chip U2 is connected to the first control terminal of the switching assembly. The discharging control terminal (i.e., the DOP terminal in this embodiment) of the protection chip U2 is connected to the second control terminal of the switching assembly. The output terminal of the switching assembly is electrically connected to the battery. The battery switching terminal (i.e., the SEL terminal in this embodiment) of the protection chip U2 is connected to one end of the resistor R36. The other end of the resistor R36 is connected to one end of the resistor R62. The other end of the resistor R62 is connected to one end of the resistor R61. The other end of the resistor R61 is grounded.

[0086] The switching assembly is formed by connecting the drains of switching transistor Q8 and switching transistor Q9 in series. Preferably, the protection chip U2 is model S-8254. In specific implementation, the protection chip U2 can also be replaced with other protection chips with the same function.

[0087] Specifically, when overvoltage or over-discharge of the battery is detected, the charging and discharging control terminal (PWM terminal) of the main control circuit 300 will output a PWM control signal. After receiving the PWM control signal, the controlled terminal of transistor Q3 will conduct, thereby pulling down the conduction voltage of transistors Q4 and Q15, causing transistors Q4 and Q15 to be cut off, thus cutting off the charging and discharging circuit of the battery.

[0088] In this embodiment, the protection unit can quickly respond to various abnormal states of the battery, promptly cut off the charging and discharging circuit, and prevent battery damage or safety accidents. At the same time, the protection chip U2 can accurately manage the battery charging and discharging process, improving the battery's efficiency and safety.

[0089] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a power display circuit 500, the input terminal of which is connected to the power display terminal of the main control circuit 300, and the power display circuit 500 is used to display the current power of the backup power system.

[0090] Specifically, the power display circuit 500 includes LEDs LED1, LED2, LED3, LED4, and LED5, resistors R41, R42, R43, R44, and R45. The first power display terminal of the main control circuit 300 (i.e., the LED1 terminal in this embodiment) is connected to one end of resistor R45, and the other end of resistor R45 is connected to the positive terminal of LED5. The negative terminal of LED5 is grounded. The second power display terminal of the main control circuit 300 (i.e., the LED2 terminal in this embodiment) is connected to one end of resistor R44, and the other end of resistor R44 is connected to the positive terminal of LED4. The negative terminal of LED 4 is grounded. The third power display terminal of the main control circuit 300 (i.e., the LED3 terminal in this embodiment) is connected to one end of the resistor R43. The other end of the resistor R43 is connected to the positive terminal of the LED 3. The negative terminal of the LED 3 is grounded. The fourth power display terminal of the main control circuit (i.e., the LED4 terminal in this embodiment) is connected to one end of the resistor R42. The other end of the resistor R42 is connected to the positive terminal of the LED 2. The negative terminal of the LED 2 is grounded. The fifth power display terminal of the main control circuit (i.e., the LED5 terminal in this embodiment) is connected to one end of the resistor R41. The other end of the resistor R41 is connected to the positive terminal of the LED 1. The negative terminal of the LED 1 is grounded.

[0091] In this example, when the battery is at 100%, all LEDs are lit. When the battery is at 80%, LED1 is off, and the other LEDs are on. When the battery is at 60%, LEDs 1 and 2 are off, and the other LEDs are on. When the battery is at 40%, LEDs 1, 2, and 3 are off, and the other LEDs are on. When the battery is at 20%, LEDs 1, 2, 3, and 4 are off, and LED5 is on. When the battery is at 0%, all LEDs are off. It should be understood that the above example, showing which LEDs are off when the battery is at different levels, is only a preferred implementation and does not specifically limit which LED is off corresponding to the current battery level.

[0092] In this embodiment, the power display circuit can display the current power level of the backup power system in real time, allowing users to intuitively understand the remaining power of the device, making it easier to determine whether the battery needs to be charged, and avoiding the inability of the battery to charge other devices due to insufficient power, thus affecting the user experience.

[0093] Those skilled in the art should understand that the above description is one embodiment provided in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Furthermore, due to differences in industry naming conventions, it is not limited to the above names or English names. Any methods or structures similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A notebook backup power supply system, characterized by comprising: The utility model relates to a backup power supply system, comprising: a battery for providing power input for the backup power supply system; a charging circuit having a power input electrically connected to the battery and configured to provide power for a load; a master control circuit having a load detection input electrically connected to a power output of the charging circuit and a charging control output electrically connected to a power input of the charging circuit; the load detection input of the master control circuit is configured to detect whether a load is connected to the charging circuit for charging, and if not, the charging control output of the master control circuit outputs a control signal to control the charging circuit to stop charging; the charging circuit comprises a notebook charging module, the notebook charging module comprises a notebook charging unit and a notebook load detection unit, the power input of the notebook charging unit is electrically connected to the battery, and the notebook charging control input of the notebook charging unit is connected to the first charging control output of the master control circuit; the input of the notebook load detection unit is connected to the power output of the notebook charging unit, and the output of the notebook load detection unit is connected to the load detection input of the master control circuit.

2. The notebook backup power system of claim 1, wherein, The charging circuit further comprises: a USB port charging module, the input of the USB port charging module is electrically connected to the battery, the output of the USB port charging module is electrically connected to a USB device, and the charging control input of the USB port charging module is connected to the second charging control output of the master control circuit; a 12V power supply charging module, the input of the 12V power supply charging module is electrically connected to the battery, the output of the 12V power supply charging module is electrically connected to a 12V general-purpose device, and the charging control input of the 12V power supply charging module is connected to the third charging control output of the master control circuit.

3. The notebook backup power system of claim 2, wherein, The USB port charging module comprises: a USB charging unit, the power input of the USB charging unit is electrically connected to the battery, and the USB charging control input of the USB charging unit is connected to the second charging control output of the master control circuit, a USB load detection unit, the input of the USB load detection unit is connected to the power output of the USB charging unit, the output of the USB load detection unit is connected to the load detection input of the master control circuit, and the USB load detection unit is configured to detect whether a USB load is connected for charging, and if not, the master control circuit cuts off the output of the USB charging unit.

4. The notebook backup power system of claim 2, wherein, The 12V power supply charging module comprises: a 12V charging unit, the power input of the 12V charging unit is electrically connected to the battery, and the charging control input of the 12V charging unit is connected to the third charging control output of the master control circuit. 12V load detection unit, the input end of the 12V load detection unit is connected with the power output end of the 12V charging unit, the output end of the 12V load detection unit is connected with the load detection input end of the main control circuit, the 12V load detection unit is used for detecting whether the 12V general equipment is connected for charging, and when it is detected that the 12V general equipment is not connected for charging, the main control circuit cuts off the output of the 12V charging unit.

5. The notebook backup power supply system of claim 1, wherein, The notebook charging module further comprises: Output voltage switching unit, the switching signal input end of the output voltage switching unit is connected with the switching signal control output end of the main control circuit, and the switching signal output end of the output voltage switching unit is used for executing a charging voltage switching operation when the voltage switching signal of the main control circuit is received.

6. The notebook backup power supply system of claim 2, wherein, Further comprising a battery management circuit, the battery management circuit is electrically connected with the battery, and is used for providing over-discharge protection and overcharge protection for the battery.

7. The notebook backup power supply system of claim 6, wherein, The battery management circuit comprises: A step-down module, the input end of the step-down module is electrically connected with the battery, and the output end of the step-down module is used for reducing the charging voltage of the battery to 5V; A battery protection module, the battery protection module is electrically connected with the battery, the power control input end of the battery protection module is connected with the power control output end of the main control circuit, and the battery protection module is used for cutting off the output of the battery when over-discharge and / or overcharge occurs.

8. The notebook backup power supply system of claim 7, wherein, The step-down module comprises a linear voltage stabilizer U9 and a diode D1, the output end of the battery is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the input end of the linear voltage stabilizer U9, and the output end of the linear voltage stabilizer U9 is connected with the power end of the main control circuit.

9. The notebook backup power supply system of claim 7, wherein, The battery protection module comprises: An overvoltage detection unit, the input end of the overvoltage detection unit is electrically connected with the battery, and the output end of the overvoltage detection unit is connected with the overvoltage detection input end of the main control circuit; An overcurrent detection unit, the input end of the overcurrent detection unit is connected with the negative electrode end of the battery, and the output end of the overcurrent detection unit is connected with the overcurrent detection input end of the main control circuit; A protection unit, the protection unit is electrically connected with the battery, the charge-discharge control end of the protection unit is connected with the charge-discharge control end of the main control circuit, and the protection unit is used for providing over-discharge protection and overcharge protection for the battery.

10. The notebook backup power supply system of claim 1, wherein, Further comprising: A power display circuit, the input end of the power display circuit is connected with the power display end of the main control circuit, and the power display circuit is used for displaying the current power of the backup power supply system.

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