Power supply control circuit and electronic equipment

Abstract

The utility model discloses a power supply control circuit and an electronic device, the power supply control circuit is arranged between a battery and a load system, and the power supply control circuit comprises a pre-stage FET module used for switching on / off the output of a DC power supply; the voltage reduction module is connected with the pre-stage FET module, the battery and the load system, and the voltage reduction module is used for performing voltage reduction on the DC power supply and then outputting the DC power supply to the battery and the load system; the post-stage FET module is connected with the battery, the load system and the voltage reduction module, and the post-stage FET module is used for switching on and off the output of the battery to the load system; and the control module is connected with the front-stage FET module, the rear-stage FET module, the voltage reduction module, the battery and the load system, and the control module is used for controlling the front-stage FET module to turn off the output of the DC power supply when detecting that the voltage of the battery is greater than or equal to the saturation voltage and receiving a standby signal of the load system, and simultaneously controlling the rear-stage FET module to turn on the output of the battery. The power supply control circuit can reduce the power consumption after the system enters the standby state when the battery is fully charged, and effectively reduces the power consumption of the system.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to a power control circuit and electronic device. Background Technology

[0002] With the widespread use of portable motherboards, such as smartphones and laptops, the design of power management systems has become particularly important. Most current electronic device motherboards employ a dual-MOSFET control scheme for their battery management systems, using two MOSFETs to control charging and discharging separately. When the adapter input is present, even when the battery is fully charged or the system is idle, the battery still has a significant voltage output, resulting in unnecessary energy consumption and higher system power consumption. Utility Model Content

[0003] This utility model provides a power control circuit and electronic device to solve the problem of high power consumption during system charging.

[0004] In a first aspect, embodiments of the present invention provide a power control circuit disposed between a battery and a load system, comprising:

[0005] The front-end FET module is used to switch the output of the DC power supply on and off.

[0006] A step-down module is connected to the front-end FET module, the battery, and the load system. The step-down module is used to step down the DC power supply and output it to the battery and the load system.

[0007] The post-stage FET module is connected to the battery, the load system, and the buck module. The post-stage FET module is used to switch the battery's output to the load system.

[0008] A control module is connected to the pre-stage FET module, the post-stage FET module, the buck module, the battery, and the load system. The control module is used to control the pre-stage FET module to turn off the output of the DC power supply when it detects that the voltage of the battery is greater than or equal to the saturation voltage and receives the standby signal from the load system, and at the same time control the post-stage FET module to turn on the output of the battery.

[0009] In the power control circuit provided in this embodiment of the present invention, the subsequent FET module includes a first BATFET and a current detection unit. The drain of the first BATFET is connected to the battery, the gate is connected to the control module, and the source is connected to the buck module and the load system. The current detection unit is connected to the drain of the first BATFET, the battery, and the control module. The current detection unit is used to detect the current of the first BATFET to generate a detection voltage, and the control module adjusts the on / off state of the first BATFET according to the detection voltage.

[0010] In the power control circuit provided in this embodiment of the present invention, the current sensing unit includes a current sensing resistor, one end of which is connected to the drain of the first BATFET and the other end is connected to the battery, and the control module is connected to both ends of the current sensing resistor.

[0011] In the power control circuit provided in this embodiment of the present invention, the front-end FET module includes a second BATFET and a driving unit. The gate of the second BATFET is connected to the driving unit, the source is connected to the DC power supply, and the drain is connected to the buck module. The driving unit is connected to the DC power supply and the control module. The driving unit is used to receive the control signal from the control module to generate a driving voltage to drive the second BATFET to switch the DC power supply on and off to the output of the buck module.

[0012] In the power control circuit provided in this embodiment of the present invention, the step-down module includes a switching transistor unit, an energy storage unit, and a discharge unit. The switching transistor unit is connected to the front-end FET module, the control module, the energy storage unit, and the discharge unit. The discharge unit is connected to the energy storage unit, the rear-end FET module, and the load system. The switching transistor unit is used to switch the output of the DC power supply on and off under the control of the PWM signal output by the control module. The energy storage unit is used to store the electrical energy output by the DC power supply. The discharge unit is used to release the electrical energy stored in the energy storage unit.

[0013] In the power control circuit provided in this embodiment of the present invention, the switching transistor unit includes a first switching transistor unit and a second switching transistor unit. The first switching transistor unit is connected to the front-end FET module, the energy storage unit, and the discharge unit. The second switching transistor unit is connected to the discharge unit, the rear-end FET module, and the load system. The first switching transistor unit is used to switch the output of the DC power supply on and off under the control of the PWM signal output by the control module. The second switching transistor unit is used to switch the output of the electrical energy stored in the energy storage unit on and off under the control of the PWM signal output by the control module.

[0014] In the power control circuit provided in this embodiment of the present invention, the first switching transistor unit includes a first FET and a second FET. The gate of the first FET is connected to the control module, the drain is connected to the front-end FET module, and the source is connected to the energy storage unit, the discharge unit, and the second switching transistor unit. The gate of the second FET is connected to the control module, the drain is connected to the energy storage unit, the discharge unit, and the second switching transistor unit, and the source is grounded.

[0015] In the power control circuit provided in this embodiment of the present invention, the second switching transistor unit includes a third FET and a fourth FET. The gate of the third FET is connected to the control module, the drain is connected to the energy storage unit, the discharge unit and the first switching transistor unit, and the source is grounded. The gate of the fourth FET is connected to the control module, the drain is connected to the subsequent FET module and the load system, and the source is connected to the energy storage unit, the discharge unit and the first switching transistor unit.

[0016] In the power control circuit provided in this embodiment of the present invention, the energy storage unit includes a first inductor, a first capacitor, and a second capacitor, and the discharge unit includes a first resistor and a second resistor. One end of the first inductor is connected to the source of the first FET and the drain of the third FET, and the other end of the first inductor is connected to the drain of the second FET and the source of the fourth FET. One end of the first resistor and the second resistor are respectively connected to the two ends of the first inductor, and the other ends of the first resistor and the second resistor are respectively connected to one end of the first capacitor and the second capacitor. The other ends of the first capacitor and the second capacitor are both grounded.

[0017] Secondly, this utility model embodiment also provides an electronic device, which includes any of the power control circuits provided in this utility model embodiment.

[0018] This utility model provides a power control circuit and an electronic device. The power control circuit is located between a battery and a load system. It includes a pre-stage FET module for switching the output of a DC power supply; a buck module connected to the pre-stage FET module, the battery, and the load system, which steps down the DC power supply and outputs it to the battery and the load system; a post-stage FET module connected to the battery, the load system, and the buck module, which switches the battery's output to the load system; and a control module connected to the pre-stage FET module, the post-stage FET module, the buck module, the battery, and the load system. The control module controls the pre-stage FET module to turn off the DC power supply output when it detects that the battery voltage is greater than or equal to the saturation voltage and receives a standby signal from the load system, and simultaneously controls the post-stage FET module to turn on the battery output. The power control circuit of this application controls the front-end FET module to turn off the DC power output when the control module detects that the battery voltage is greater than or equal to the saturation voltage and receives the standby signal from the load system. At the same time, it controls the rear-end FET module to turn on the battery output. This ensures that the power supply for the system to operate in standby mode when the battery is fully charged is provided solely by the battery. This reduces the power consumption of the system after it enters standby mode when the battery is fully charged, effectively reducing the power consumption of the system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A structural block diagram of a power control circuit provided in an embodiment of this utility model;

[0021] Figure 2 A structural block diagram of a power control circuit provided in an embodiment of this utility model;

[0022] Figure 3 A structural block diagram of a power control circuit provided in an embodiment of this utility model;

[0023] Figure 4 A structural block diagram of a power control circuit provided in an embodiment of this utility model;

[0024] Figure 5 A partial circuit diagram of the power control circuit provided in an embodiment of this utility model;

[0025] Figure 6A partial circuit diagram of the power control circuit provided in an embodiment of this utility model;

[0026] Figure 7 A partial circuit diagram of the power control circuit provided in an embodiment of this utility model;

[0027] The labels for the attached figures are as follows:

[0028] 10. Buck module; 11. Switching transistor unit; 111. First switching transistor unit; 112. Second switching transistor unit; 12. Energy storage unit; 13. Discharge unit; 20. Front-end FET module; 21. Second BATFET; 22. Drive unit; 30. Back-end FET module; 31. First BATFET; 32. Current detection unit; 40. Control module; 100. Battery; 200. Load system. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] The directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings. Therefore, the directional terms used are for explanation and understanding of this invention, and not for limiting it. Furthermore, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0031] Please see Figures 1 to 7 For details, please refer to Figure 1This utility model embodiment illustrates a power control circuit and electronic device. In this embodiment, the power control circuit is located between the battery 100 and the load system 200, and includes a front-end FET module 20, a buck module 10, a rear-end FET module 30, and a control module 40. The front-end FET module 20 is used to switch the output of DC power. The buck module 10 is connected to the front-end FET module 20, the battery 100, and the load system 200, and is used to step down the DC power and output it to the battery 100 and the load system 200. The rear-end FET module 30 is connected to the battery 100 and the load system 200. The system includes a pre-amplifier 200, a step-down module 10, and a load system 200. The post-amplifier FET module 30 is used to switch the output of the battery 100 to the load system 200. The control module 40 is connected to the pre-amplifier FET module 20, the post-amplifier FET module 30, the step-down module 10, the battery 100, and the load system 200. When the control module 40 detects that the voltage of the battery 100 is greater than or equal to the saturation voltage and receives a standby signal from the load system 200, it controls the pre-amplifier FET module 20 to turn off the output of the DC power supply and simultaneously controls the post-amplifier FET module 30 to turn on the output of the battery 100.

[0032] In practical implementation, this power control circuit can be applied to the motherboards of various electronic devices with battery systems, such as laptop motherboards and smartphone motherboards. In this embodiment, the power control circuit is mainly located between the battery 100 and the load system 200. The power control circuit mainly includes a front-end FET module 20, a buck module 10, a back-end FET module 30, and a control module 40. The front-end FET module 20 serves as the main input terminal for the DC power supply. The DC power supply is the output power of the power adapter. Different power adapters may have DC power supplies with different voltage specifications, such as 12V, 19V, and 24V. The DC power supply needs to pass through the front-end FET module 20 to be output to the circuit. The front-end FET module 20 is used to switch the DC power supply output to the circuit. The step-down module 10 is connected to the pre-amplifier FET module 20, the battery 100, and the load system 200. When the pre-amplifier FET module 20 is turned on, the DC power supply is first output to the step-down module 10. The main function of the step-down module 10 is to step down the DC power supply, primarily to the battery 100 and the load system 200. The output to the battery 100 is for charging, while the output to the load system 200 is for powering it. The step-down module 10 can reduce the DC power supply voltage to the voltage required by the load system 200, providing power to it, and also outputting power to the battery 100 for charging. The step-down module 10 is controlled by the control module 40, meaning the control module 40 can control the magnitude of the output voltage of the step-down module 10. The post-stage FET module 30 is connected to the battery 100, the load system 200, and the buck module 10. The post-stage FET module 30 is connected between the buck module 10 and the battery 100, and also between the battery 100 and the load system 200. The post-stage FET module 30 is mainly used to switch the output of the battery 100 to the load system 200, i.e., the post-stage FET module 30 isolates the battery 100 and the load system 200. The control module 40 is the core of the entire circuit. The control module 40 is connected to the pre-stage FET module 20, the post-stage FET module 30, the buck module 10, the battery 100, and the load system 200. The control module 40 is specifically a single control chip or a combination of multiple control chips and peripheral circuits. The control module 40 is typically designed using a SOC chip or MCU. The control module 40 can directly detect the voltage of battery 100 and compare it with the saturation voltage to determine whether battery 100 is fully charged. The saturation voltage is the standard voltage when battery 100 is fully charged. When the voltage of battery 100 is greater than or equal to the saturation voltage, it means that battery 100 is fully charged; otherwise, it is not fully charged. When the load system enters standby mode, the load system 200 usually outputs multiple signals, which are typically high-level. These signals serve as standby signals to indicate that the load system 200 has entered standby mode.When the voltage of battery 100 is detected to be less than the saturation voltage, or when no standby signal is received from the load system 200, the front-end FET module 20 turns on the output of the DC power supply and the rear-end FET module 30 turns off the output of battery 100 by default. The DC power supply, after being stepped down by the buck module 10, charges battery 100 and simultaneously supplies power to the load system 200. When the control module 40 detects that the voltage of battery 100 is greater than or equal to the saturation voltage and receives a standby signal from the load system 200, the control module 40 controls the front-end FET module 20 to turn off the output of the DC power supply and simultaneously controls the rear-end FET module 30 to turn on the output of battery 100, thus cutting off the output of the DC power supply. At this time, the load system 200 is powered solely by battery 100, reducing unnecessary power consumption after the load system 200 enters standby mode and lowering system power consumption.

[0033] In this embodiment, the power control circuit controls the front-end FET module to turn off the DC power input when the control module detects that the battery voltage is greater than or equal to the saturation voltage and receives the standby signal from the load system. At the same time, it controls the rear-end FET module to turn on the battery output. This ensures that when the battery is fully charged, the system's standby power is provided solely by the battery, reducing unnecessary power consumption and effectively lowering the system's power consumption.

[0034] In one embodiment, reference is made to Figure 2The subsequent FET module 30 includes a first BATFET 31 and a current detection unit 32. The drain of the first BATFET 31 is connected to the battery 100, the gate is connected to the control module 40, and the source is connected to the buck module 10 and the load system 200. The current detection unit 32 is connected to the drain of the first BATFET 31, the battery 100, and the control module 40. The current detection unit 32 is used to detect the current of the first BATFET 31 to generate a detection voltage. The control module 40 adjusts the on / off state of the first BATFET 31 according to the detection voltage. In a specific implementation, the subsequent FET module 30 includes a first BATFET 31 and a current detection unit 32. The first BATFET 31 is a Battery FET (battery field-effect transistor) device that isolates the battery 100 from the load system 200. The first BATFET 31 integrates multiple transistors and has multiple sources, multiple drains, and a common gate. The drain of the first BATFET 31 is connected to the battery 100, the gate is connected to the control module 40, and the source is connected to the buck module 10 and the load system 200. The current sensing unit 32 is connected to the drain of the first BATFET 31, the battery 100, and the control module 40. The first BATFET 31 can control the charging and discharging of the battery 100 under the drive of the control module 40. The current sensing unit 32 is mainly used to detect the current of the first BATFET 31, including the input current and output current of the first BATFET 31. The current sensing unit 32 generates a detection voltage based on the current of the first BATFET 31 and outputs it to the control module 40. The control module 40 generates a corresponding PWM signal based on the detection voltage to control and adjust the on / off state of the first BATFET 31. This realizes the dynamic adjustment of the on / off state of the first BATFET 31 based on the current of the first BATFET 31. When there is an input DC power supply from an input adapter, it can optimize charging, improve the system load capacity, and improve the battery 100 lifespan.

[0035] Furthermore, referring to Figure 5The current sensing unit 32 includes a current sensing resistor. One end of the current sensing resistor is connected to the drain of the first BATFET 31, and the other end is connected to the battery 100. The control module 40 is connected to both ends of the current sensing resistor. In a specific implementation, the current sensing unit 32 mainly includes a current sensing resistor. One end of the current sensing resistor is connected to the drain of the first BATFET 31, and the other end is connected to the output terminal of the battery 100. The control module 40 is connected to both ends of the current sensing resistor through two input terminals. The current sensing resistor is mainly used to detect the current flowing through the first BATFET 31. When the control module 40 controls the first BATFET 31 to be turned on, the current flows through the current sensing resistor, and a voltage difference is generated across the current sensing resistor, that is, a detection voltage is generated across the current sensing resistor. The control module 40 accurately calculates the current of the first BATFET 31 based on the voltage difference (detection voltage) across the current sensing resistor, and obtains the voltage of the battery 100 and the charging and discharging current of the battery 100. The control module 40 adjusts the duty cycle of the PWM signal used to drive the first BATFET 31 based on the obtained detection voltage, thereby controlling the on and off state of the first BATFET 31 and realizing precise regulation of the charging and discharging current.

[0036] In one embodiment, reference is made to Figure 2The front-end FET module 20 includes a second BATFET 21 and a driving unit 22. The gate of the second BATFET 21 is connected to the driving unit 22, the source is connected to the DC power supply, and the drain is connected to the buck module 10. The driving unit 22 is connected to the DC power supply and the control module 40. The driving unit 22 receives control signals from the control module 40 to generate a driving voltage to drive the second BATFET 21 to switch the DC power supply on and off to the buck module 10. Specifically, the front-end FET module 20 includes a second BATFET 21 and a driving unit 22. The second BATFET 21 is a BatteryFET (battery field-effect transistor) device that isolates the DC power supply from the battery 100. The DC power supply provided by the adapter is connected through the source of the second BATFET 21. The gate of the second BATFET 21 is connected to the driving unit 22, the source is connected to the DC power supply, and the drain is connected to the buck module 10. The driving unit 22 is connected to the DC power supply and the control module 40. The second BATFET 21 serves as a DC power supply switching device. The second BATFET 21 requires a high drive voltage, which cannot be directly driven by the signal output from the control module 40. Therefore, it is driven by the drive unit 22, which is specifically an amplifier circuit composed of transistors. The drive unit 22 amplifies the control signal output from the control module 40 to generate a drive voltage. The drive voltage of the drive unit 22 drives the second BATFET 21 to switch on and off, thereby enabling the second BATFET 21 to switch the DC power supply to the output of the buck module 10.

[0037] In one embodiment, reference is made to Figure 3The step-down module 10 includes a switching transistor unit 11, an energy storage unit 12, and a discharge unit 13. The switching transistor unit 11 is connected to the front-end FET module 20, the control module 40, the energy storage unit 12, and the discharge unit 13. The discharge unit 13 is connected to the energy storage unit 12, the rear-end FET module 30, and the load system 200. The switching transistor unit 11 is used to switch the output of the DC power supply on and off under the control of the PWM signal output by the control module 40. The energy storage unit 12 is used to store the electrical energy output by the DC power supply. The discharge unit 13 is used to release the electrical energy stored in the energy storage unit 12. In specific implementation, the step-down module 10 mainly consists of a switching transistor unit 11, an energy storage unit 12, and a discharge unit 13. The switching transistor unit 11 is connected to the front-end FET module 20, the control module 40, the energy storage unit 12, and the discharge unit 13. The switching transistor unit 11 is used as a high-frequency switch and is regulated by the control module 40. After the front-end FET module 20 is turned on, the DC power supply will be output to the switching transistor unit 11. The energy storage unit 12 is a device for storing electrical energy, including inductors, capacitors, and other devices. The energy storage unit 12 can store the electrical energy output by the DC power supply. The discharge unit 13 is connected to the energy storage unit 12, the back-end FET module 30, and the load system 200. The discharge unit 13 is used to release the electrical energy stored in the energy storage unit 12, so that the energy storage unit 12 can be discharged and re-store electrical energy. The control module 40 drives the switching transistor unit 11 by outputting a PWM signal, controlling the switching frequency of the switching transistor unit 11. Under the drive of the PWM signal, the switching transistor unit 11 turns the output of the DC power supply on and off. By turning the switching transistor unit 11 on or off under the control of the PWM signal, in conjunction with the energy storage unit 12 storing electrical energy and the discharge unit 13 releasing electrical energy, the DC power supply voltage is reduced. By adjusting the duty cycle of the output PWM signal, the control module 40 can reduce the voltage of the DC power supply to the voltage value required for the normal operation of the load system 200.

[0038] Furthermore, referring to Figure 4The switching unit 11 includes a first switching unit 111 and a second switching unit 112. The first switching unit 111 is connected to the front-end FET module 20, the energy storage unit 12, and the discharge unit 13. The second switching unit 112 is connected to the discharge unit 13, the rear-end FET module 30, and the load system 200. The first switching unit 111 is used to switch the output of the DC power supply on and off under the control of the PWM signal output by the control module 40. The second switching unit 112 is used to switch the output of the electrical energy stored in the energy storage unit 12 on and off under the control of the PWM signal output by the control module 40. In a specific implementation, the switching unit 11 includes a first switching unit 111 and a second switching unit 112. The first switching unit 111 is connected to the front-end FET module 20, the energy storage unit 12, and the discharge unit 13. After the front-end FET module 20 turns on the DC power supply, the DC power supply is first output to the first switching unit 111. The second switching unit 112 is connected to the discharge unit 13, the subsequent FET module 30, and the load system 200. The second switching unit 112 is a step-down output terminal. The stepped-down voltage is output from the second switching unit 112 to the load system 200 for power supply, and also output to the subsequent FET module 30 to charge the battery 100. Both the first switching unit 111 and the second switching unit 112 are driven and controlled by the PWM signal output from the control module 40. Under the control of the PWM signal, the first switching unit 111 switches the output of the DC power supply, so that the electrical energy of the DC power supply is stored in the energy storage unit 12; while the second switching unit 112, under the control of the PWM signal, switches the output of the electrical energy stored in the energy storage unit 12, so that the electrical energy stored in the energy storage unit 12 is released by the discharge unit 13 and output to the load system 200 and the subsequent FET module 30. The control module 40 drives the first switching unit 111 and the second switching unit 112 to opposite states. That is, when the control module 40 drives the first switching unit 111 to turn on, it will simultaneously drive the second switching unit 112 to turn off, and when the control module 40 drives the first switching unit 111 to turn off, it will simultaneously drive the second switching unit 112 to turn on. The first switching unit 111 and the second switching unit 112 are alternately turned on to realize the step-down of the DC power supply. By adjusting the duty cycle of the PWM signal, the control module 40 can reduce the voltage of the DC power supply to the voltage value required for the normal operation of the load system 200.

[0039] Furthermore, referring to Figure 7The first switching unit 111 includes a first FET Q14 and a first FET Q17. The gate of the first FET Q14 is connected to the control module 40, the drain is connected to the front-end FET module 20, and the source is connected to the energy storage unit 12, the discharge unit 13, and the second switching unit 112. The gate of the first FET Q17 is connected to the control module 40, the drain is connected to the energy storage unit 12, the discharge unit 13, and the second switching unit 112, and the source is grounded. The second switching unit 112 includes a third FET Q16 and a fourth FET Q15. The gate of the third FET Q16 is connected to the control module 40, the drain is connected to the energy storage unit 12, the discharge unit 13, and the first switching unit 111, and the source is grounded. The gate of the fourth FET Q15 is connected to the control module 40, the drain is connected to the back-end FET module 30 and the load system 200, and the source is connected to the energy storage unit 12, the discharge unit 13, and the first switching unit 111. In a specific implementation, the first switching unit 111 is composed of the first FET Q14 and the first FET Q17, while the second switching unit 112 is composed of the third FET Q16 and the fourth FET Q15. The first FET Q14, the first FET Q17, the third FET Q16 and the fourth FET Q15 are all field-effect transistors. The first FET Q14, the first FET Q17, the third FET Q16 and the fourth FET Q15 can be designed as MOSFETs or battery FETs.The gate of the first FET Q14 is connected to the control module 40 to receive PWM signals. The drain of the first FET Q14 is connected to the preceding FET module 20 for inputting DC power. The source of the first FET Q14 is connected to the energy storage unit 12, the discharge unit 13, and the second switching unit 112, specifically connected to the drain of the third FET Q16. The gate of the first FET Q17 is connected to the control module 40 to receive PWM signals. The drain of the first FET Q17 is connected to the energy storage unit 12, the discharge unit 13, and the second switching unit 112, specifically connected to the source of the fourth FET Q15. The source of the first FET Q17 is grounded. The gate of the third FET Q16 is connected to the control module 40 to receive PWM signals. The drain of the third FET Q16 is connected to the energy storage unit 12, the discharge unit 13, and the first switching unit 111, specifically connected to the source of the first FET Q14. The source of the third FET Q16 is grounded. The gate of the fourth FET Q15 is connected to the control module 40 to receive PWM signals. The drain of Q15 is connected to the subsequent FET module 30 and the load system 200. The source of the fourth FET Q15 is connected to the energy storage unit 12, the discharge unit 13, and the first switching transistor unit 111, specifically connected to the drain of the first FET Q17. In practical applications, the control module 40 outputs four PWM signals to the first FET Q14, the first FET Q17, the third FET Q16, and the fourth FET Q15 respectively. The buck conversion process is divided into two cycles. In the first cycle, the PWM signals output by the control module 40 control the first FET Q14 and the first FET Q17 to turn on, while the third FET Q16 and the fourth FET Q15 turn off, allowing the energy storage unit 12 to complete charging. In the second cycle, the PWM signals output by the control module 40 control the first FET Q14 and the first FET Q17 to turn off, while the third FET Q16 and the fourth FET Q15 turn on, allowing the energy stored in the energy storage unit 12 to be released by the discharge unit 13. Within a complete signal cycle, the control module 40 can adjust the output voltage by adjusting the duty cycle of the first FET Q14, the first FET Q17, the third FET Q16, and the fourth FET Q15, so as to output a voltage that meets the power supply requirements of the load system 200.

[0040] Furthermore, referring to Figure 7The energy storage unit 12 includes a first inductor LC14, a first capacitor C226, and a second capacitor C227. The discharge unit 13 includes a first resistor RC20 and a second resistor RC21. One end of the first inductor LC14 is connected to the source of the first FET Q14 and the drain of the third FET Q16. The other end of the first inductor LC14 is connected to the drain of the first FET Q17 and the source of the fourth FET Q15. One end of the first resistor RC20 and the second resistor RC21 are respectively connected to the two ends of the first inductor LC14. The other ends of the first resistor RC20 and the second resistor RC21 are respectively connected to one end of the first capacitor C226 and the second capacitor C227. The other ends of the first capacitor C226 and the second capacitor C227 are both grounded. In a specific implementation, the energy storage unit 12 comprises a first inductor LC14, a first capacitor C226, and a second capacitor C227. The discharge unit 13 comprises a first resistor RC20 and a second resistor RC21. One end of the first inductor LC14 is connected to the source of the first FET Q14 and the drain of the third FET Q16. The other end of the first inductor LC14 is connected to the drain of the first FET Q17 and the source of the fourth FET Q15. One end of the first resistor RC20 and the second resistor RC21 are respectively connected to the two ends of the first inductor LC14, forming a parallel connection. The other ends of the first resistor RC20 and the second resistor RC21 are respectively connected to one end of the first capacitor C226 and the second capacitor C227. The other ends of the first capacitor C226 and the second capacitor C227 are both grounded. In practical applications, during the conduction cycles of the first FET Q14 and the first FET Q17, the electrical energy of the DC power supply is stored through the first inductor LC14, the first capacitor C226, and the second capacitor C227. During the conduction cycles of the third FET Q16 and the fourth FET Q15, the electrical energy stored in the first inductor LC14, the first capacitor C226, and the second capacitor C227 is released through the first resistor RC20 and the second resistor RC21. The control module 40 adjusts the duty cycle of the first FET Q14, the first FET Q17, the third FET, and the fourth FET Q15 to regulate the output voltage and output a voltage that meets the power supply requirements of the load system 200.

[0041] In one embodiment, to facilitate understanding of the signal control process of the power supply control circuit, the following is combined with... Figure 5 , Figure 6 as well as Figure 7 Please provide a detailed explanation.

[0042] 1. In charging mode

[0043] In charging mode, the load system 200 is powered by the input adapter, and its power supply is equal to the power of the DC power supply minus the charging power of the battery 100. For example... Figure 5 and Figure 6 As shown, the second BATFET 21 (QN1) of the front-end FET module 20 is an input-isolated P-type MOSFET element, and the first BATFET 31 (U17) of the rear-end FET module 30 is a P-type MOSFET element for battery 100 isolation. DC_IN is the DC power input for the external adapter, and DC_IN_KEY is a GPIO connection terminal of the control module 40. The control module 40 controls the switching on and off of the second BATFET 21 (QN1) by controlling the level of DC_IN_KEY, thus achieving the switching effect of the DC power output. Normally, when the adapter is connected, DC_IN_KEY is low by default, and the second BATFET 21 (QN1) is on by default. During power-on, by setting the voltage divider resistor, the control module 40 can determine whether the adapter is connected based on the voltage division value of the voltage divider resistor.

[0044] (1) Before the battery 100 is fully charged, the control module 40 adjusts the opening degree of the first BATFET 31 (U17) according to the voltage of the battery 100. VUBS represents the input voltage of the external adapter, i.e., the voltage of the DC power supply, VSYS represents the voltage of the load system 200, Vsysmin represents the minimum system voltage, and VBAT represents the voltage of the battery 100. When the control module 40 determines that VBAT is less than Vsysmin, the control module 40 controls the first BATFET 31 (U17) to run in LDO linear mode to limit the charging current of the battery 100, and at the same time controls the buck module 10 to adjust VSYS to Vsysmin + 160mV; when the control module 40 determines that VBAT is between VUBS and Vsysmin, the control module 40 controls the first BATFET 31 (U17) to be fully turned on, thereby improving the charging efficiency and the system load capacity.

[0045] (2) When the battery 100 is not fully charged and the system is only in standby mode, VSYS is used to represent the voltage of the load system 200 and Vsysmin represents the minimum voltage of the system. The control module 40 controls the voltage VSYS output by the step-down module 10 to the load system 200 so that the voltage VSYS of the load system 200 is maintained at Vsysmin+160mV.

[0046] (3) When the battery 100 is fully charged and the load system 200 enters the standby state, the control unit pulls DC_IN_KEY high, which turns off the second BATFET 21 (QN1) and disconnects the DC power supply input to the adapter. At this time, the power supply of the load system 200 is provided by the battery 100, which reduces unnecessary power consumption and lowers the standby power consumption of the system and the whole machine.

[0047] 2. In 100% battery power mode only

[0048] In the battery 100-only power supply mode, since there is no DC power input, the control module 40 controls the first BATFET 31 (U17) to be fully turned on, so that the battery 100 provides the maximum power output, thereby maximizing the power supply capacity of the battery 100.

[0049] In one embodiment, an electronic device is provided that integrates the power control circuit described in the above embodiments. This electronic device includes a load system, a battery, etc. The power control circuit is mainly located between the battery and the load system to manage charging and discharging. When the electronic device is fully charged, after the system enters standby mode, the battery supplies power to the system, reducing unnecessary power consumption and resulting in lower power consumption. This electronic device can be, but is not limited to, a computer, mobile device, etc. Since the specific structure and working principle of the power control circuit have been described in detail in the above embodiments, they will not be repeated here.

[0050] The electronic device in this embodiment uses the power control circuit provided in this embodiment of the invention, which significantly reduces power consumption and improves performance in standby mode.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A power control circuit, disposed between a battery and a load system, characterized in that, include: The front-end FET module is used to switch the output of the DC power supply on and off. A step-down module is connected to the front-end FET module, the battery, and the load system. The step-down module is used to step down the DC power supply and output it to the battery and the load system. The post-stage FET module is connected to the battery, the load system, and the buck module. The post-stage FET module is used to switch the battery's output to the load system. A control module is connected to the pre-stage FET module, the post-stage FET module, the buck module, the battery, and the load system. The control module is used to control the pre-stage FET module to turn off the output of the DC power supply when it detects that the voltage of the battery is greater than or equal to the saturation voltage and receives the standby signal from the load system, and at the same time control the post-stage FET module to turn on the output of the battery.

2. The power control circuit according to claim 1, characterized in that, The subsequent FET module includes a first BATFET and a current detection unit. The drain of the first BATFET is connected to the battery, the gate is connected to the control module, and the source is connected to the buck module and the load system. The current detection unit is connected to the drain of the first BATFET, the battery, and the control module. The current detection unit is used to detect the current of the first BATFET to generate a detection voltage, and the control module adjusts the on / off state of the first BATFET according to the detection voltage.

3. The power control circuit according to claim 2, characterized in that, The current sensing unit includes a current sensing resistor, one end of which is connected to the drain of the first BATFET and the other end of which is connected to the battery. The control module is connected to both ends of the current sensing resistor.

4. The power control circuit according to claim 1, characterized in that, The front-end FET module includes a second BATFET and a driving unit. The gate of the second BATFET is connected to the driving unit, the source is connected to the DC power supply, and the drain is connected to the buck module. The driving unit is connected to the DC power supply and the control module. The driving unit is used to receive the control signal from the control module to generate a driving voltage to drive the second BATFET to switch the DC power supply on and off to the output of the buck module.

5. The power control circuit according to any one of claims 1-4, characterized in that, The buck module includes a switching transistor unit, an energy storage unit, and a discharge unit. The switching transistor unit is connected to the front-end FET module, the control module, the energy storage unit, and the discharge unit. The discharge unit is connected to the energy storage unit, the back-end FET module, and the load system. The switching unit is used to switch the output of the DC power supply on and off under the control of the PWM signal output by the control module; the energy storage unit is used to store the electrical energy output by the DC power supply; and the discharge unit is used to release the electrical energy stored in the energy storage unit.

6. The power control circuit according to claim 5, characterized in that, The switching unit includes a first switching unit and a second switching unit. The first switching unit is connected to the front-end FET module, the energy storage unit, and the discharge unit. The second switching unit is connected to the discharge unit, the back-end FET module, and the load system. The first switching unit is used to switch the output of the DC power supply on and off under the control of the PWM signal output by the control module, and the second switching unit is used to switch the output of the electrical energy stored in the energy storage unit on and off under the control of the PWM signal output by the control module.

7. The power control circuit according to claim 6, characterized in that, The first switching transistor unit includes a first FET and a second FET. The gate of the first FET is connected to the control module, the drain is connected to the front-end FET module, and the source is connected to the energy storage unit, the discharge unit, and the second switching transistor unit. The gate of the second FET is connected to the control module, the drain is connected to the energy storage unit, the discharge unit, and the second switching transistor unit, and the source is grounded.

8. The power control circuit according to claim 7, characterized in that, The second switching transistor unit includes a third FET and a fourth FET. The gate of the third FET is connected to the control module, the drain is connected to the energy storage unit, the discharge unit and the first switching transistor unit, and the source is grounded. The gate of the fourth FET is connected to the control module, the drain is connected to the subsequent FET module and the load system, and the source is connected to the energy storage unit, the discharge unit and the first switching transistor unit.

9. The power control circuit according to claim 8, characterized in that, The energy storage unit includes a first inductor, a first capacitor, and a second capacitor. The discharge unit includes a first resistor and a second resistor. One end of the first inductor is connected to the source of the first FET and the drain of the third FET. The other end of the first inductor is connected to the drain of the second FET and the source of the fourth FET. One end of the first resistor and the second resistor are respectively connected to the two ends of the first inductor. The other ends of the first resistor and the second resistor are respectively connected to one end of the first capacitor and the second capacitor. The other ends of the first capacitor and the second capacitor are both grounded.

10. An electronic device, characterized in that, Includes the power control circuit described in any one of claims 1-9.

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