Battery charging integrated circuit

Abstract

The utility model relates to the technical field of integrated circuits, and discloses a battery charging integrated circuit, which aims to solve the technical problem that the conventional battery charging integrated circuit is insufficient in automatic adjustment of charging parameters according to the actual state of a battery, and comprises a control module U3, the control module U3 is connected with an automatic compensation circuit, a current induction signal input circuit, a charging control output circuit and a charging state output circuit. The automatic compensation circuit comprises an in-phase buffer U1 and a voltage regulator U5, the input end of the in-phase buffer U1 is used for inputting a charging rate compensation signal, the inverted input end of the voltage regulator U5 is used for inputting a voltage induction signal, and the output end of the voltage regulator U5 is respectively connected with the charging control output circuit and the control module U3; the circuit further comprises an operational amplifier U6 used for battery recharging and an operational amplifier U7 used for battery charging adjustment, and through cooperative work of the components, the integrated circuit applying the circuit can adjust charging parameters in real time so as to adapt to changes of the battery and the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, in particular to a battery charging integrated circuit. Background Art

[0002] With the popularity of mobile devices and portable electronic products, battery technology has become a key component of modern electronic engineering. Efficient and reliable battery charging solutions are essential to extend battery life, improve energy efficiency, and ensure the normal operation of equipment. Therefore, developing highly integrated battery charging circuits to adapt to different types of batteries and complex charging requirements has become a major research hotspot in this field.

[0003] Limitations in existing technologies: Traditional battery charging systems usually rely on simple linear chargers or basic switch-mode chargers, which often lack the ability to adapt to dynamic changes in the charging process, such as temperature fluctuations, battery capacity reduction, and changes in environmental conditions. These limitations affect charging efficiency, increase battery loss, and fail to ensure that the battery can be charged safely and effectively under all conditions.

[0004] Battery charging systems often face problems such as low charging efficiency, insufficient monitoring, and excessive energy consumption. For example, traditional charging systems cannot automatically adjust charging parameters according to the actual state of the battery, resulting in low charging efficiency; lack of real-time voltage and current monitoring makes it difficult to adjust the charging state in time to respond to battery and environmental changes; when the device is not in operation, traditional circuits may continue to consume power due to improper design. Utility Model Content

[0005] The utility model aims to provide a battery charging integrated circuit to solve the technical problem that the existing battery charging integrated circuit is insufficient in automatically adjusting charging parameters according to the actual state of the battery.

[0006] To achieve the above purpose, the specific technical solution of a battery charging integrated circuit of the utility model is as follows:

[0007] A battery charging integrated circuit includes a control module U3, wherein the control module U3 is connected to an automatic compensation circuit, a current sensing signal input circuit, a charging control output circuit and a charging state output circuit; the automatic compensation circuit includes a common-phase buffer U1 and a voltage regulator U5, wherein the input end of the common-phase buffer U1 is used to input a charging rate compensation signal, the output end of the common-phase buffer U1 is connected to the common-phase input end of the voltage regulator U5, the inverting input end of the voltage regulator U5 is input with a voltage sensing signal, and the output end of the voltage regulator U5 is respectively connected to the charging control output circuit and the control module U3; and further includes an operational amplifier for battery recharging. U6, an operational amplifier U7 for battery charging regulation, the inverting input terminal of the operational amplifier U6, the inverting input terminal of the operational amplifier U5 and the inverting input terminal of the operational amplifier U7 are connected; a plurality of resistors R9, a resistor R10, a resistor R11 and a resistor R12 are provided in series, the resistor R9 is grounded, and the resistor R12 is input with a reference voltage to form a voltage divider circuit, the inverting input terminal of the operational amplifier U7 is connected to the middle node of the resistor R9 and the resistor R10, the inverting input terminal of the operational amplifier R6 is connected to the middle node of the resistor R10 and the resistor R11, and the non-inverting input terminal of the voltage regulator U5 is connected to the middle node of the resistor R11 and the resistor R12 through the resistor R13.

[0008] Furthermore, the current sensing signal input circuit includes a current regulator U10, a high and low current detector U11 and a charge termination controller U2, the non-inverting input terminal of the current regulator U10 is connected to the non-inverting input terminal of the high and low current detector U11, the non-inverting input terminal of the current regulator U10 is used to input the current sensing signal, the inverting input terminal of the charge termination controller U2 is connected to the inverting input terminal of the current regulator U10, the inverting input terminal of the current regulator U10 is grounded through resistors R15 and R14 in sequence, and the intermediate node between resistors R15 and R14 is connected to the non-inverting input terminal of the charge termination controller U2.

[0009] Furthermore, an electronic selection switch SW1 is provided, and the common end of the electronic selection switch SW1 is respectively connected to the output end of the high and low current detector U11 and the inverting input end of the current regulator U10, and different voltage signals are respectively input to the two moving contact ends of the electronic selection switch SW1, and the output end of the current regulator U10 and the charging termination controller U2 is connected to the control module U3.

[0010] Further, the charging control output circuit includes a transistor Q9, a transistor Q10, a MOS transistor Q6 and a MOS transistor Q11, the transistor Q9 and the transistor Q10 are NPN transistors, the MOS transistor Q6 and the MOS transistor Q11 are PMOS transistors, the collector of the transistor Q9, the collector of the transistor Q10 and the drain of the MOS transistor Q11 are used to input the power supply voltage VCC, the emitter of the transistor Q9, the emitter of the transistor Q10 and the source of the MOS transistor Q11 are commonly connected to the gate of the MOS transistor Q6, the gate of the MOS transistor Q6 is grounded through the resistor R16, the source of the MOS transistor Q6 is grounded, and the drain of the MOS transistor Q6 is used as a charging control output terminal; the base of the transistor Q10 is connected to the output terminal of the current regulator U10, the base of the transistor Q9 is connected to the output terminal of the voltage regulator U5, and the gate of the MOS transistor Q11 is connected to the control module U3.

[0011] Furthermore, it also includes a temperature sensing control circuit, which is provided with an operational amplifier U8 and an operational amplifier U9, the in-phase input terminal of the operational amplifier U8 is connected to the in-phase input terminal of the operational amplifier U9, and is used to input a temperature sensing signal, and is provided with a resistor R6, a resistor R7 and a resistor R8 connected in series in sequence, the resistor R6 is grounded, the resistor R8 is used to input a power supply voltage VCC, the intermediate node of the resistor R7 and the resistor R8 is connected to the inverting input terminal of the operational amplifier U8, and the intermediate node of the resistor R7 and the resistor R6 is connected to the inverting input terminal of the operational amplifier U9.

[0012] The battery charging integrated circuit provided by the utility model has the following advantages:

[0013] Through the coordinated work of the in-phase buffer, voltage regulator, battery recharging op amp U6 and battery charging regulation op amp U7, the circuit can adjust the charging parameters in real time to adapt to changes in the battery and environment to ensure charging in the best state; the voltage divider circuit composed of multiple resistors provides the necessary voltage reference for the op amp, so that the circuit dynamically adjusts the output according to real-time feedback, further enhancing responsiveness and accuracy. In addition, through the charging status output circuit, users can intuitively monitor the charging status and effectively manage the use of the device. The battery charging integrated circuit effectively improves charging efficiency and extends battery life through its automatic compensation circuit, precise voltage and current control, flexible feedback mechanism, enhanced charging monitoring and improved safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an internal functional block diagram of the battery charging integrated circuit provided by the utility model. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0016] See also Figure 1 The utility model provides a battery charging integrated circuit, including a control module U3, the control module U3 is connected with an automatic compensation circuit, a current sensing signal input circuit, a charging control output circuit and a charging state output circuit.

[0017] The automatic compensation circuit includes a common-phase buffer U1 and a voltage regulator U5. The input end of the common-phase buffer U1 is used to input a charging rate compensation signal. The output end of the common-phase buffer U1 is connected to the common-phase input end of the voltage regulator U5. The inverting input end of the voltage regulator U5 is input with a voltage sensing signal. The output end of the voltage regulator U5 is respectively connected to the charging control output circuit and the control module U3. It also includes an operational amplifier U6 for battery recharging and an operational amplifier U7 for battery charging regulation. The inverting input terminal of the operational amplifier U6, the inverting input terminal of the operational amplifier U5 and the inverting input terminal of the operational amplifier U7 are connected. A plurality of resistors R9, R10, R11 and R12 are provided in series. The resistor R9 is grounded, and a reference voltage is input to the resistor R12 to form a voltage divider circuit. The inverting input terminal of the operational amplifier U7 is connected to the middle node of the resistor R9 and the resistor R10, the inverting input terminal of the operational amplifier R6 is connected to the middle node of the resistor R10 and the resistor R11, and the non-inverting input terminal of the voltage regulator U5 is connected to the middle node of the resistor R11 and the resistor R12 through the resistor R13.

[0018] The automatic compensation circuit, including the in-phase buffer U1 and the voltage regulator U5, can automatically adjust the charging current and voltage to adapt to different charging states and battery conditions. This not only ensures high efficiency of the charging process, but also helps prevent battery damage caused by improper charging.

[0019] The design of the current sensing signal input circuit and the voltage sensing signal input circuit enables the circuit to monitor and accurately control the current and voltage during the charging process in real time, thereby improving the charging accuracy and safety.

[0020] The voltage divider formed by resistors R9 to R12 can provide an accurate feedback signal to op amps U7 and U6, allowing these op amps to perform more precise voltage regulation, which helps achieve a more stable charging output.

[0021] The use of voltage regulator U5 not only provides a stable voltage output, but also ensures high responsiveness and reliability of voltage regulation through the design of the non-inverting and inverting input terminals.

[0022] The charging status output circuit allows users to directly monitor the charging process, including charging start, in progress and completion status, which increases the user's observation and control over the device status.

[0023] The current sensing signal input circuit includes a current regulator U10, a high and low current detector U11 and a charge termination controller U2. The non-inverting input terminal of the current regulator U10 is connected to the non-inverting input terminal of the high and low current detector U11. The non-inverting input terminal of the current regulator U10 is used to input the current sensing signal. The inverting input terminal of the charge termination controller U2 is connected to the inverting input terminal of the current regulator U10. The inverting input terminal of the current regulator U10 is grounded through resistors R15 and R14 in sequence. The intermediate node of resistors R15 and R14 is connected to the non-inverting input terminal of the charge termination controller U2. An electronic selection switch SW1 is provided. The common terminal of the electronic selection switch SW1 is respectively connected to the output terminal of the high and low current detector U11 and the inverting input terminal of the current regulator U10. Different voltage signals are input to the two moving contact terminals of the electronic selection switch SW1. The voltage at one terminal is VCC-V (SNS), and the voltage at the other terminal is VSS-V (SNS). The inverting input terminal of the high and low current detector U11 is used to input a 0.5VCC voltage. The output terminals of the current regulator U10 and the charge termination controller U2 are connected to the control module U3.

[0024] VCC-V(SNS) indicates the voltage difference between the power supply voltage VCC and the current sensing voltage V(SNS). In battery management systems, this parameter is often used to monitor the current size and direction.

[0025] VSS-V(SNS) represents the voltage difference between the system ground VSS and the current sensing voltage (V(SNS)). Again, this parameter plays an important role in current monitoring and battery management.

[0026] The current regulator U10 is used to control and stabilize the charging current. Current regulation ensures that the charging current remains within a set safety range during the battery charging process, which helps to improve the battery life and performance.

[0027] The charge termination controller U2 automatically stops charging when it detects that the battery is fully charged or meets certain conditions (such as voltage, time or temperature thresholds). This prevents overcharging of the battery, thereby protecting the battery safety and extending its life.

[0028] The high and low current detector U11 is used to set the high and low current detection thresholds. By setting these thresholds, the chip can take corresponding protection measures when the current exceeds the preset high or low thresholds.

[0029] The design of the current sensing signal input circuit plays a key role in the battery charging management system. The components contained in it, such as the current regulator U10, the high and low current detectors U11 and the charge termination controller U2, work together.

[0030] Precise current control, the current regulator U10 is responsible for controlling and stabilizing the charging current, ensuring that the current during the charging process remains within a safe range. Such precise control not only optimizes the charging efficiency, but also helps prevent battery overheating or damage caused by excessive current, thereby improving the battery life and performance.

[0031] Dynamic current monitoring and protection, high and low current detector U11 can monitor in real time whether the charging current exceeds these thresholds by setting different current thresholds. Once abnormal current is detected, the system can quickly take measures such as reducing the charging current or stopping charging completely, thereby protecting the battery from damage.

[0032] The charge termination controller U2 monitors the battery's charging status and automatically stops charging when the battery is fully charged or reaches a preset termination condition (such as a specific voltage, time, or temperature). This function prevents overcharging and prolonged overcharging of the battery, helping to extend battery life and maintain its performance.

[0033] Voltage signal selection and control, the electronic selector switch SW1 allows the circuit to switch between different voltage signals, thereby adjusting the current input according to the actual battery and charging status. This flexible signal processing enhances the adaptability and responsiveness of the circuit.

[0034] Through the VCC-V(SNS) and VSS-V(SNS) parameters, the circuit can effectively monitor and adjust the size and direction of the charging current to ensure that the entire charging process is carried out under optimal conditions.

[0035] The charging control output circuit includes a transistor Q9, a transistor Q10, a MOS transistor Q6 and a MOS transistor Q11, wherein the transistor Q9 and the transistor Q10 are NPN transistors, and the MOS transistor Q6 and the MOS transistor Q11 are PMOS transistors. The collector of the transistor Q9, the collector of the transistor Q10 and the drain of the MOS transistor Q11 are used to input the power supply voltage VCC, the emitter of the transistor Q9, the emitter of the transistor Q10 and the source of the MOS transistor Q11 are connected to the gate of the MOS transistor Q6, the gate of the MOS transistor Q6 is grounded through a resistor R16, the source of the MOS transistor Q6 is grounded, and the drain of the MOS transistor Q6 is used as the charging control output terminal CC.

[0036] The base of the transistor Q10 is connected to the output end of the current regulator U10, the base of the transistor Q9 is connected to the output end of the voltage regulator U5, and the gate of the MOS transistor Q11 is connected to the control module U3 and is controlled by the control module U3.

[0037] The collectors of the two NPN transistors Q9 and Q10 are connected to the power supply voltage VCC, and their emitters are connected to the gate of the MOS transistor Q6. The bases of the transistors Q9 and Q10 are controlled by the voltage regulator U5 and the current regulator U10 respectively. Such a configuration allows the two transistors to be adjusted according to the voltage and current requirements, thereby controlling the switching state of the MOS transistor Q6.

[0038] MOS tube Q6 is a PMOS tube, whose gate is grounded through resistor R16 and connected to the emitter of the transistor, the source is grounded, and the drain is used as the charging control output terminal CC. The gate of MOS tube Q11 is controlled by the control module U3, and the drain is connected to VCC. This configuration enables Q11 to control the opening and closing of charging according to the instructions of the control module.

[0039] The control module U3 controls the MOS tube Q11 and indirectly affects the gate potential of the MOS tube Q6, thereby controlling the flow and disconnection of the charging current.

[0040] In the charging control output circuit, by combining NPN transistors Q9, Q10 and PMOS tubes Q6, Q11, the charging current can be accurately controlled to be turned on and off. The bases of transistors Q9 and Q10 are connected to voltage regulator U5 and current regulator U10 respectively, so that the charging control not only responds to voltage changes but also needs current regulation, thereby achieving more precise charging control.

[0041] The use of MOS tubes Q11 and Q6 provides efficient switching function, reduces power consumption, and improves the overall efficiency of the circuit. In particular, under the control of the control module U3, the PMOS tube Q11 can switch in time according to the charging state and effectively manage the supply of power.

[0042] The source grounding and drain of MOS tube Q6 serve as the charging control output terminal CC, which helps to isolate the charging control from other circuit parts, reduce interference, and provide certain circuit protection.

[0043] The charging state output circuit includes an NMOS tube Q4 and a PMOS tube Q12. The drain of the PMOS tube Q12 is used to input the power supply voltage VCC, the source of the NMOS tube Q4 is grounded, the gate of the NMOS tube Q4 and the gate of the PMOS tube Q12 are commonly connected to the control module U3 and are controlled by the control module U3; the drain of the NMOS tube Q4 is connected to the source of the PMOS tube Q12, and the node of the two is used as the output end of the charging state output circuit.

[0044] The charging status output circuit uses NMOS tube Q4 and PMOS tube Q12, combined with the control module U3 to monitor and output the charging status.

[0045] The drain of the PMOS tube Q12 is connected to the power supply voltage VCC, and the source is connected to the drain of the NMOS tube Q4. This configuration utilizes the high-level effective characteristic of the PMOS tube, that is, the PMOS tube is turned on when the gate voltage is lower than the source voltage.

[0046] The source of the NMOS tube Q4 is grounded, and the drain is connected to the source of the PMOS tube Q12. The NMOS tube is usually turned on when the gate voltage is higher than the source voltage, which is the opposite of the behavior of the PMOS tube.

[0047] Control logic, control module U3 controls the gates of two MOSFETs at the same time. When the charging status needs to be displayed (such as charging or completed), U3 adjusts the gate voltage so that Q4 and Q12 are properly turned on or off, thereby controlling the voltage state of the output terminal.

[0048] This circuit can precisely control the output terminal to accurately reflect the charging status, such as charging in progress or charging completed. This helps users monitor the charging process of the device and ensure that the device is used or powered off at the appropriate time; by precisely controlling the conduction and cutoff of NMOS and PMOS tubes, the circuit can effectively manage the use of power and reduce the consumption of useless power. This power management improves the energy efficiency of the overall device and reduces energy consumption; the use of two types of MOSFETs ensures that the circuit can work stably under various power and load conditions, improving the robustness and reliability of the circuit.

[0049] The above charging status output circuit provides accurate charging status indication through effective power and signal management, enhancing the user experience and operating safety of the device while optimizing energy utilization efficiency and overall system reliability.

[0050] A sleep circuit is also provided, including an operational amplifier U4, an inverting input terminal of the operational amplifier U4 is used to input a power supply voltage VCC, a non-inverting input terminal of the operational amplifier U4 is used to input a voltage sensing signal, and an output terminal of the operational amplifier U4 is connected to the control module U3.

[0051] The main function of the sleep circuit is to reduce the power consumption of the battery when there is no charging activity or non-working state. This mode helps to extend the standby time and total service life of the battery by reducing the power consumption of the entire chip. When the charging current is detected to be lower than the preset threshold, or when there is no battery connected, the chip will automatically enter sleep mode.

[0052] In sleep mode, the chip's internal circuitry reduces its power consumption as much as possible to minimize the power consumption of the entire system. By reducing power consumption in inactive states, the battery life can be effectively extended, especially when the device has not been used for a long time. Intelligently entering and exiting sleep mode can improve overall power management efficiency and ensure that the device quickly returns to normal working state when needed. It avoids unnecessary damage to the battery due to continuous power consumption by the chip when the battery is connected but not charging.

[0053] It also includes a temperature sensing control circuit, including an operational amplifier U8 and an operational amplifier U9. The non-inverting input terminal of the operational amplifier U8 is connected to the non-inverting input terminal of the operational amplifier U9 for inputting a temperature sensing signal. A resistor R6, a resistor R7 and a resistor R8 are provided in series in sequence. The resistor R6 is grounded. The resistor R8 is used to input a power supply voltage VCC. The middle node between the resistor R7 and the resistor R8 is connected to the inverting input terminal of the operational amplifier U8. The middle node between the resistor R7 and the resistor R6 is connected to the inverting input terminal of the operational amplifier U9.

[0054] The non-inverting inputs of op amps U8 and U9 are connected, and these two inputs receive the signal from the temperature sensor. This configuration allows the two op amps to monitor the same temperature changes at the same time, enhancing the responsiveness of the system.

[0055] Resistors R6, R7, and R8 form a voltage divider, with R6 connected to ground and R8 connected to the power supply voltage VCC. The purpose of this arrangement is to generate two different voltage levels as the inverting input of the op amp to help determine and adjust the gain and operating point of the op amp.

[0056] The voltage provided by the middle node of resistors R7 and R8 is connected to the inverting input of op amp U8, while the voltage provided by the middle node of resistors R7 and R6 is connected to the inverting input of op amp U9. The voltages of these two middle nodes are calculated by the power supply voltage and the ground voltage through a voltage divider to provide appropriate voltage levels according to the ratio of the resistance values.

[0057] When the temperature signal causes the voltage at the non-inverting input to change, the op amp compares this change with the voltage at its inverting input and amplifies the difference. This process allows even tiny temperature changes to be detected and amplified, making it suitable for precise control and monitoring.

[0058] Through a finely tuned resistor divider network and dual op amp design, the circuit can accurately monitor and respond to small temperature changes. The temperature sensing control circuit can provide highly accurate and stable temperature monitoring through effective signal processing and amplification, as well as precise feedback and reference voltage settings.

[0059] The implementation of the utility model provides a battery charging integrated circuit which brings the following beneficial effects:

[0060] Precise control and real-time monitoring. The operational amplifier, in-phase buffer and voltage regulator in the utility model enable the circuit to accurately adjust and monitor the charging current and voltage in real time, ensuring the high efficiency and safety of the charging process; automatic compensation and responsiveness. The automatic compensation circuit can automatically adjust the charging parameters according to the actual state of the battery, enhancing the responsiveness and adaptability of the charging process; the sleep mode design significantly reduces energy consumption in the inactive state, which helps to protect the environment and extend the battery life; the temperature sensing control circuit can accurately monitor the battery temperature, prevent unsafe factors such as overheating, and increase the reliability and service life of the equipment.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery charging integrated circuit, comprising a control module U3, characterized in that: The control module U3 is connected to an automatic compensation circuit, a current sensing signal input circuit, a charging control output circuit and a charging status output circuit; the automatic compensation circuit includes a common-phase buffer U1 and a voltage regulator U5, the input end of the common-phase buffer U1 is used to input a charging rate compensation signal, the output end of the common-phase buffer U1 is connected to the common-phase input end of the voltage regulator U5, the inverting input end of the voltage regulator U5 is input with a voltage sensing signal, and the output end of the voltage regulator U5 is respectively connected to the charging control output circuit and the control module U3; it also includes an operational amplifier U6 for battery recharging, an operational amplifier U7 for battery charging regulation, and an operational amplifier U8 for battery charging regulation. The operational amplifier U7 of the section, the inverting input terminal of the operational amplifier U6, the inverting input terminal of the operational amplifier U5 and the inverting input terminal of the operational amplifier U7 are connected; a plurality of resistors R9, resistor R10, resistor R11 and resistor R12 are provided in series, the resistor R9 is grounded, and the resistor R12 is input with a reference voltage to form a voltage divider circuit, the inverting input terminal of the operational amplifier U7 is connected to the middle node of the resistor R9 and the resistor R10, the inverting input terminal of the operational amplifier R6 is connected to the middle node of the resistor R10 and the resistor R11, and the non-inverting input terminal of the voltage regulator U5 is connected to the middle node of the resistor R11 and the resistor R12 through the resistor R13.

2. The battery charging integrated circuit according to claim 1, characterized in that: The current sensing signal input circuit includes a current regulator U10, a high and low current detector U11 and a charge termination controller U2. The non-inverting input terminal of the current regulator U10 is connected to the non-inverting input terminal of the high and low current detector U11. The non-inverting input terminal of the current regulator U10 is used to input the current sensing signal. The inverting input terminal of the charge termination controller U2 is connected to the inverting input terminal of the current regulator U10. The inverting input terminal of the current regulator U10 is grounded through resistors R15 and R14 in sequence. The intermediate node between resistors R15 and R14 is connected to the non-inverting input terminal of the charge termination controller U2.

3. The battery charging integrated circuit according to claim 2, characterized in that: An electronic selection switch SW1 is provided, and the common end of the electronic selection switch SW1 is respectively connected to the output end of the high and low current detector U11 and the inverting input end of the current regulator U10, and different voltage signals are respectively input to the two moving contact ends of the electronic selection switch SW1, and the output end of the current regulator U10 and the charging termination controller U2 is connected to the control module U3.

4. The battery charging integrated circuit according to claim 3, characterized in that: The charging control output circuit includes a transistor Q9, a transistor Q10, a MOS transistor Q6 and a MOS transistor Q11. The transistor Q9 and the transistor Q10 are NPN transistors, the MOS transistor Q6 and the MOS transistor Q11 are PMOS transistors, the collector of the transistor Q9, the collector of the transistor Q10 and the drain of the MOS transistor Q11 are used to input a power supply voltage VCC, the emitter of the transistor Q9, the emitter of the transistor Q10 and the source of the MOS transistor Q11 are commonly connected to the gate of the MOS transistor Q6, the gate of the MOS transistor Q6 is grounded through a resistor R16, the source of the MOS transistor Q6 is grounded, and the drain of the MOS transistor Q6 is used as a charging control output terminal; the base of the transistor Q10 is connected to the output terminal of the current regulator U10, the base of the transistor Q9 is connected to the output terminal of the voltage regulator U5, and the gate of the MOS transistor Q11 is connected to the control module U3.

5. The battery charging integrated circuit according to claim 4, characterized in that: It also includes a temperature sensing control circuit, which is provided with an operational amplifier U8 and an operational amplifier U9. The non-inverting input terminal of the operational amplifier U8 is connected to the non-inverting input terminal of the operational amplifier U9 for inputting a temperature sensing signal. A resistor R6, a resistor R7 and a resistor R8 are provided in series in sequence. The resistor R6 is grounded. The resistor R8 is used to input a power supply voltage VCC. The middle node between the resistor R7 and the resistor R8 is connected to the inverting input terminal of the operational amplifier U8, and the middle node between the resistor R7 and the resistor R6 is connected to the inverting input terminal of the operational amplifier U9.

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