A mobile phone power supply circuit

Abstract

The present invention discloses a mobile phone power supply circuit, belonging to the technical field of power supply. Both the adapter voltage and the battery voltage are input to the charging chip. When the system voltage is less than the threshold voltage, the charging chip outputs a low level to the first switch and a high level to the second switch. At this time, the first switch is closed and the second switch is opened, and the adapter input voltage supplies power to both the system voltage and the battery simultaneously; after charging is completed, the system voltage is greater than the threshold voltage and the charging current drops. When the charging current is less than the cut-off current of the preset value, the charging chip outputs a low level to the second switch, and the second switch is closed, and the adapter input voltage cuts off the charging; when the input voltage is still overloaded, when the system voltage is less than the battery voltage, the charging chip outputs a high level to the first switch. The present invention does not require the use of too many peripheral devices, the circuit implementation is relatively simple, and the volume is small, which can meet the requirements of miniaturization and integration of the mobile phone power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and particularly to a mobile phone power supply circuit. Background Art

[0002] Currently, mobile phones have been developing towards the direction of intelligence, functionality, and integration. The requirements of functionality and integration pose great challenges to the power supply design and management of mobile phones. This is mainly because the high power consumption brought by multiple functions significantly reduces the working life of lithium batteries, and the battery working time is one of the most concerned indicators for end users. At the same time, due to the increasing requirements of third-party applications for hardware, the main frequency of smart phones is getting higher and higher, and the performance of graphics processing technology (GPU) is getting higher and higher. Correspondingly, the power consumption of smart phones is also getting larger and larger, and the charging time of the battery is getting longer and longer, which has exceeded people's tolerance limit. Therefore, how to achieve fast charging of smart phones is extremely urgent and has great practical significance.

[0003] The mobile phone baseband device is the place with the largest power consumption except for the power amplifier, and the power consumption of this part can usually be further reduced by reducing the working voltage and operating frequency. For example, the dynamic voltage and frequency conversion technology can adjust the working clock and working voltage of the processor according to the working state. In addition, selecting a suitable buck converter is also very helpful for reducing the overall power consumption of the system. Generally speaking, the LDO power supply has a low static current and is more suitable for application scenarios where the input and output voltages are not very different. The switching power supply has a high power conversion efficiency and is more suitable for application scenarios where the input and output voltages are quite different. Since the working voltages required by various future mobile phone function modules are different, the future mobile phone power supply will definitely develop towards the direction of multiple output voltages, high output currents, and high integration.

[0004] For mobile phone baseband chips, there are often requirements for low voltage and high current. The usual solution is to combine several voltage outputs of several switching mode power supplies into one voltage output to meet the requirement of high current. However, such a design, on the one hand, will cause more occupation of the output of the switching power supply, so that more switching power supplies have to be added to meet the requirements of other power outputs, increasing the volume of the mobile phone power supply circuit and reducing the reliability of the design; on the other hand, combining several into one voltage output will cause the ripple of the output voltage to be unstable, and in some cases, the voltage ripple even exceeds the output voltage itself, resulting in the entire circuit being unable to work properly. Summary of the Invention

[0005] In view of this, the present invention provides a mobile phone power supply circuit. This circuit does not need to use too many peripheral devices, the circuit implementation is relatively simple, and the volume is small, which can meet the requirements of miniaturization and integration of mobile phone power supplies.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A mobile phone power supply circuit includes an adapter input power supply and a battery input power supply; it also includes a charging chip BQ24190, a DC-DC power supply LTM4644, a first switch and a second switch; the adapter input power supply and the battery input power supply are respectively connected to the input ports of the first switch and the second switch; the first bi-directional port of the charging chip BQ24190 is connected to the first switch, and the second bi-directional port is connected to the second switch; the adapter input power supply and the battery input are connected to the corresponding input interfaces of the charging chip BQ24190; the output ports of the first switch and the second switch are both connected to the input port of the DC-DC power supply LTM4644;

[0008] When the system voltage is less than the threshold voltage, the charging chip BQ24190 outputs a low level to the first switch and a high level to the second switch. At this time, the first switch is closed and the second switch is opened, and the system and the battery are powered simultaneously through the adapter input power supply;

[0009] After charging is completed, the system voltage is greater than the threshold voltage and the charging current drops. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to the second switch, and the second switch is closed, and the adapter input power supply stops charging; when the input voltage is still overloaded, the system voltage further drops. When the system voltage is less than the battery voltage, the charging chip BQ24190 outputs a high level to the first switch, and the first switch is turned on, and the system is powered through the battery input power supply.

[0010] Further, it also includes a power management chip RK809-2, a high-power output power module DA9214 and a load;

[0011] The output port of the VDD + 3.8V of the DC-DC power supply LTM4644 is connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the power management chip RK809-2 and the VDD_A1, VDD_A2, VDD_B1, VDD_B2 and VDD_SYS interfaces of the high-power output power module DA9214; the output port of the VDDIO + 1.8V of the DC-DC power supply LTM4644 is connected to the VCCIO interface of the high-power output power module DA9214;

[0012] The V_LDO2 and V_LDO4 interfaces in the power management chip RK809-2 are respectively connected to the EN_A and EN_B interfaces in the high-power output power module DA9214, and LX_A1, LX_A2 and LXB1, LXB2 respectively output two paths of 0.8V voltages to be connected to the backend load;

[0013] In the power management chip RK809-2, the 1.1V voltage output from the V_BUCK1 port is connected to the backend load, the 1.8V voltage output from the V_BUCK3 port is connected to the backend load, the +3.3V voltage output from the V_BUCK5 port is connected to the backend load, and the voltage output from the V_BUCK5 port is connected to the VCC6, VCC7, and VCC8 ports to form a loop.

[0014] A mobile phone power supply circuit includes an adapter input power supply and a battery input power supply; it also includes a charging chip BQ24190, an LDO power supply TPS74401, a first switch, and a second switch; the adapter input power supply and the battery input power supply are respectively connected to the input ports of the first switch and the second switch; the first bi-directional port of the charging chip BQ24190 is connected to the first switch, and the second bi-directional port is connected to the second switch; the adapter input power supply and the battery input are connected to the corresponding input interfaces of the charging chip BQ24190; the output ports of the first switch and the second switch are both connected to the input port of the LDO power supply TPS74401;

[0015] When the system voltage is less than the threshold voltage, the charging chip BQ24190 outputs a low level to the first switch and a high level to the second switch. At this time, the first switch is closed and the second switch is opened, and the system and the battery are powered by the adapter input power supply at the same time;

[0016] After charging is completed, the system voltage is greater than the threshold voltage and the charging current drops. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to the second switch, and the second switch is closed, and the adapter input power supply stops charging; when the input voltage is still overloaded, the system voltage further drops. When the system voltage is less than the battery voltage, the charging chip BQ24190 outputs a high level to the first switch, and the first switch is turned on, and the system is powered by the battery input power supply.

[0017] Furthermore, it also includes a power management chip RK809-2, a high-power output power module DA9214, and a load;

[0018] The VDD +3.8V output ports of the first switch and the second switch are connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the power management chip RK809-2 and the VDD_A1, VDD_A2, VDD_B1, VDD_B2, and VDD_SYS interfaces of the high-power output power module DA9214. The VDDIO +1.8V output port of the LDO power supply TPS74401 is connected to the VCCIO interface of the high-power output power module DA9214;

[0019] In the power management chip RK809-2, the V_LDO2 and V_LDO4 interfaces are respectively connected to the EN_A and EN_B interfaces in the high-power output power module DA9214. LX_A1, LX_A2, LXB1, and LXB2 respectively output two 0.8V voltages to be connected to the backend load.

[0020] In the power management chip RK809-2, the V_BUCK1 port outputs a 1.1V voltage to be connected to the backend load, the V_BUCK3 port outputs a 1.8V voltage to be connected to the backend load, the V_BUCK5 port outputs a +3.3V voltage to be connected to the backend load, and the voltage output from the V_BUCK5 port is connected to the VCC6, VCC7, and VCC8 ports to form a loop.

[0021] The beneficial effects of the present invention adopting the above technical solutions are as follows:

[0022] The present invention can automatically adapt to two different voltage inputs, namely adapter power input and battery input, and can satisfy the output of 5-way BUCK power supply voltages and 9-way different LDO power supply voltages. At the same time, it can satisfy the output of two 0.8V / 10A low-voltage and large-current outputs and meet the specific power-on timing sequence. In addition, this circuit does not need to use too many peripheral devices, the circuit implementation is relatively simple, and the volume is small, which can meet the requirements of miniaturization and integration of mobile phone power supplies. Description of the Drawings

[0023] Figure 1 It is a principle block diagram of Power Supply Scheme 1 of the embodiment of the present invention;

[0024] Figure 2 It is a principle block diagram of Power Supply Scheme 2 of the embodiment of the present invention Detailed Embodiments

[0025] Next, the present invention will be further described in conjunction with the drawings and specific embodiments.

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] A mobile phone power supply circuit includes an adapter input power supply and a battery input power supply; it also includes a charging chip BQ24190, a DC-DC power supply LTM4644, a first switch and a second switch; the adapter input power supply and the battery input power supply are respectively connected to the input ports of the first switch and the second switch; the first bidirectional port of the charging chip BQ24190 is connected to the first switch, and the second bidirectional port is connected to the second switch; the adapter input power supply and the battery input are connected to the corresponding input interfaces of the charging chip BQ24190; the output ports of the first switch and the second switch are both connected to the input port of the DC-DC power supply LTM4644;

[0028] When the system voltage is less than the threshold voltage, the charging chip BQ24190 outputs a low level to the first switch and a high level to the second switch. At this time, the first switch is closed and the second switch is open, and the system and the battery are powered by the adapter input power supply at the same time;

[0029] After charging is completed, the system voltage is greater than the threshold voltage and the charging current drops. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to the second switch, and the second switch is closed, and the adapter input power supply stops charging; when the input voltage is still overloaded, the system voltage further drops. When the system voltage is less than the battery voltage, the charging chip BQ24190 outputs a high level to the first switch, and the first switch is turned on, and the system is powered by the battery input power supply.

[0030] Furthermore, it also includes a power management chip RK809-2, a high-power output power module DA9214 and a load;

[0031] The output port of the DC-DC power supply LTM4644 with VDD + 3.8V is connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the power management chip RK809-2 and the VDD_A1, VDD_A2, VDD_B1, VDD_B2 and VDD_SYS interfaces of the high-power output power module DA9214; the output port of the DC-DC power supply LTM4644 with VDDIO + 1.8V is connected to the VCCIO interface of the high-power output power module DA9214;

[0032] The V_LDO2 and V_LDO4 interfaces in the power management chip RK809-2 are respectively connected to the EN_A and EN_B interfaces in the high-power output power module DA9214, and LX_A1, LX_A2 and LXB1, LXB2 respectively output two paths of 0.8V voltages to be connected to the backend load;

[0033] In the power management chip RK809-2, the 1.1V voltage output from the V_BUCK1 port is connected to the backend load, the 1.8V voltage output from the V_BUCK3 port is connected to the backend load, the +3.3V voltage output from the V_BUCK5 port is connected to the backend load, and the voltage output from the V_BUCK5 port is connected to the VCC6, VCC7, and VCC8 ports to form a loop.

[0034] A mobile phone power supply circuit includes an adapter input power supply and a battery input power supply; it also includes a charging chip BQ24190, an LDO power supply TPS74401, a first switch, and a second switch; the adapter input power supply and the battery input power supply are respectively connected to the input ports of the first switch and the second switch; the first bidirectional port of the charging chip BQ24190 is connected to the first switch, and the second bidirectional port is connected to the second switch; the adapter input power supply and the battery input are connected to the corresponding input interfaces of the charging chip BQ24190; the output ports of the first switch and the second switch are both connected to the input port of the LDO power supply TPS74401;

[0035] When the system voltage is less than the threshold voltage, the charging chip BQ24190 outputs a low level to the first switch and a high level to the second switch. At this time, the first switch is closed and the second switch is opened, and the system and the battery are powered by the adapter input power supply at the same time;

[0036] After charging is completed, the system voltage is greater than the threshold voltage and the charging current drops. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to the second switch, and the second switch is closed, and the adapter input power supply stops charging; when the input voltage is still overloaded, the system voltage further drops. When the system voltage is less than the battery voltage, the charging chip BQ24190 outputs a high level to the first switch, and the first switch is turned on, and the system is powered by the battery input power supply.

[0037] Furthermore, it also includes a power management chip RK809-2, a high-power output power module DA9214, and a load;

[0038] The VDD +3.8V output ports of the first switch and the second switch are connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the power management chip RK809-2 and the VDD_A1, VDD_A2, VDD_B1, VDD_B2, and VDD_SYS interfaces of the high-power output power module DA9214. The VDDIO +1.8V output port of the LDO power supply TPS74401 is connected to the VCCIO interface of the high-power output power module DA9214;

[0039] In the power management chip RK809-2, the V_LDO2 and V_LDO4 interfaces are respectively connected to the EN_A and EN_B interfaces in the high-power output power module DA9214. LX_A1, LX_A2 and LXB1, LXB2 respectively output two 0.8V voltages to be connected to the backend load.

[0040] In the power management chip RK809-2, the V_BUCK1 port outputs a 1.1V voltage to be connected to the backend load, the V_BUCK3 port outputs a 1.8V voltage to be connected to the backend load, the V_BUCK5 port outputs a +3.3V voltage to be connected to the backend load, and the voltage output by the V_BUCK5 port is connected to the VCC6, VCC7, and VCC8 ports to form a loop.

[0041] The following is a more specific embodiment:

[0042] This embodiment uses a charging chip + PMIC power management chip + power DC-DC module. The model of the charging chip is BQ24190, the model of the PMIC power management chip is RK809-1, and the model of the power DC-DC module is DA9214. Among them, according to the different input voltages (to adapt to different occasions), it can be further divided into two small solutions. See the specific principle block diagram in Figure 1 and Figure 2 .

[0043] The charging chip BQ24190 is a highly integrated single-cell lithium battery charger and system power path management device. Its low-resistance power consumption improves the switching conversion efficiency, reduces the battery charging time, and extends the battery discharge time.

[0044] It adopts the dynamic power management mode (DPM), which can ensure that the system operates above the battery voltage not lower than the minimum system voltage. Due to this characteristic, the system can operate without a battery or under the condition of deep battery over-discharge. When the input current limit or voltage limit reaches the upper limit, DPM will automatically reduce the charging current to zero and start discharging the battery to meet the system power demand. This compensation mode can prevent the input power supply from being overloaded.

[0045] The BQ24190 charging IC can automatically initialize and complete a charging cycle under the condition that the host is uncontrollable. It can automatically detect the battery voltage and battery charging current during the battery pre-charge, constant current, and constant voltage processes. Finally, when the charging IC detects that the charging current is less than the cut-off current of the preset value during the constant voltage stage, the charging IC automatically stops charging. Subsequently, when the battery voltage is less than the secondary charging voltage threshold, the charging IC will automatically trigger a charging cycle to recharge.

[0046] The DPM feature of the BQ24190 can monitor the input current and voltage in real time. When the input power supply is overloaded, that is, the current exceeds the input current limit or the voltage drops below the input limit voltage, the charging IC will either reduce the charging current until the input current is less than the input current limit and the input voltage rises above the input limit voltage.

[0047] When charging is completed, when the system voltage is greater than the threshold voltage, the charging current decreases. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to Switch2, and the Switch2 switch closes, cutting off the charging of the adapter input voltage. When the input power supply is still overloaded, the system voltage will further drop. Once the system voltage is less than the battery voltage, BQ24190 outputs a high level to Switch1, and the Switch1 switch opens, and the system voltage is powered by the battery voltage input.

[0048] When the adapter is inserted, the software will configure the charging limit voltage VBATREG and the charging cut-off current ITERM of the battery in the charging process of the charging chip. Therefore, when the adapter is in place, the battery charging will experience stages from trickle charging, constant current charging to constant voltage charging. In the constant voltage charging stage, VBAT>VBATREG. If the charging chip once detects that the charging current IBAT<ITERM, the charging chip will automatically cut off the charging and turn off the internal charging tube.

[0049] The SOC power supply scheme adopts a PMIC power management chip + DC-DC power module. The model of the PMIC power management chip is RK809-1, and the model of the DC-DC power module is DA9214. Among them, according to the different input voltages (to adapt to different occasions), it can be further divided into two small schemes.

[0050] The first scheme: A mobile phone power supply system consists of an adapter input power supply, a battery input power supply, switches switch1 and switch2, a charging chip BQ24190, a DC-DC power supply LTM4644, a power management chip RK809-2, a high-power output power module DA9214 and a load. Among them:

[0051] The adapter input power supply and the battery input are connected to the input interface of the charging chip BQ24190, and the control ports of BQ24190 are connected to the control ports of switches switch1 and switch2.

[0052] The adapter input power supply and the battery input power supply are respectively connected to the input ports of switches switch1 and switch2, and the output ports of switches switch1 and switch2 are connected to the input port of LTM4644.

[0053] The output port of VDD + 3.8V of the LTM4644 chip is connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the RK809-2 chip and the VDD_A1, VDD_A2, VDD_B1, VDD_B2 and VDD_SYS interfaces of the DA9214 chip. The output port of VDDIO + 1.8V of the LTM4644 chip is connected to the VCCIO interface of the DA9214 chip.

[0054] The V_LDO2 and V_LDO4 interfaces in the RK809-2 chip are respectively connected to the EN_A and EN_B interfaces in the DA9214 chip. LX_A1, LX_A2 and LXB1, LXB2 respectively output two 0.8V voltages to the backend load.

[0055] The V_BUCK1 port in the RK809-2 chip outputs 1.1V voltage to the backend load, the V_BUCK3 port outputs 1.8V voltage to the backend load, the V_BUCK5 port outputs +3.3V voltage to the backend load, and the voltage output by the V_BUCK5 port is connected to the VCC6, VCC7, VCC8 ports to form a loop.

[0056] The adapter voltage input and the battery voltage are simultaneously input to the charging chip BQ24190. When the system voltage is less than the threshold voltage, BQ24190 outputs a low level to Switch1 and a high level to Switch2. Switch1 is turned off and Switch2 is turned on, and the adapter input voltage supplies power to both the system voltage and the battery simultaneously. When charging is completed and the system voltage is greater than the threshold voltage, the charging current decreases. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to Switch2, and the Switch2 switch is turned off, and the adapter input voltage cuts off the charging. When the input power is still overloaded, the system voltage will further decrease. Once the system voltage is less than the battery voltage, BQ24190 outputs a high level to Switch1, and the Switch1 switch is turned on, and the system voltage is supplied with power through the battery voltage input.

[0057] In the first solution, the output system voltage is +12V. After passing through a DC-DC power module LTM4644, the input +12V system voltage is converted into VDD + 3.8V and VDDIO + 1.8V. Among them, VDD + 3.8V is simultaneously input to the main circuits inside the RK809-1 and DA9214 chips for power supply, and VDDIO + 1.8V is used to supply power to the IO part of the DA9214 chip. At this time, the BUCK5 interface of the DA9214 first outputs +3.3V to supply power to the subsequent load. Then, V_LDO2 and V_LDO4 sequentially output voltages of +1.8V and +3.0V (where the output timing of the V_LDO2 + 1.8V voltage is greater than that of the V_LDO4 + 3.0V voltage). These two voltages are respectively output to the enable interfaces of EN_A and EN_B of the DA9214, thereby controlling the output timing of the two 0.8V voltages. The two 0.8V outputs are supplied to the subsequent load for power supply. At the same time, the BUCK1 interface outputs +1.1V, and the BUCK3 interface outputs +1.8V to supply power to the subsequent load.

[0058] Second solution: A mobile phone power supply system consists of an adapter input power supply, a battery input power supply, switches switch1 and switch2, a charging chip BQ24190, an LDO power supply TPS74401, a power management chip RK809-2, a high-power output power module DA9214, and a load. Among them:

[0059] The adapter input power supply and the battery input are connected to the input interface of the charging chip BQ24190, and the control port of the BQ24190 is connected to the control ports of the switches switch1 and switch2.

[0060] The adapter input power supply and the battery input power supply are respectively connected to the input ports of the switches switch1 and switch2, and the output ports of the switches switch1 and switch2 are connected to the input port of the TPS74401.

[0061] The VDD + 3.8V output ports of the switches switch1 and switch2 are connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the RK809-2 chip and the VDD_A1, VDD_A2, VDD_B1, VDD_B2, and VDD_SYS interfaces of the DA9214 chip. The output port of the VDDIO + 1.8V of the TPS74401 chip is connected to the VCCIO interface of the DA9214 chip.

[0062] In the RK809-2 chip, the V_LDO2 and V_LDO4 interfaces are respectively connected to the EN_A and EN_B interfaces in the DA9214 chip, and LX_A1, LX_A2 and LXB1, LXB2 respectively output two 0.8V voltages to be connected to the backend load.

[0063] In the RK809-2 chip, the V_BUCK1 port outputs a 1.1V voltage to be connected to the backend load, the V_BUCK3 port outputs a 1.8V voltage to be connected to the backend load, the V_BUCK5 port outputs a +3.3V voltage to be connected to the backend load, and the voltage output from the V_BUCK5 port is connected to the VCC6, VCC7, and VCC8 ports to form a loop.

[0064] In the second solution, the output system voltage is +3.8V, and the system voltage of +3.8V is converted to +1.8V through the secondary power chip TPS74401. Among them, the input 3.8V directly powers the main circuits inside the RK809-1 and DA9214 chips, and the 1.8V powers the IO part of the DA9214 chip. At this time, the BUCK5 interface of the DA9214 first outputs +3.3V to power the subsequent load, and then V_LDO2 and V_LDO4 sequentially output +1.8V and +3.0V voltages (where the output timing of the V_LDO2 +1.8V voltage is greater than the output timing of the V_LDO4 +3.0V voltage). These two voltages are respectively output to the enable interfaces of EN_A and EN_B of the DA9214 to control the output timing of the two 0.8V voltages, and the two 0.8V outputs are supplied to the subsequent load for power supply. At the same time, the BUCK1 interface outputs +1.1V and the BUCK3 interface outputs +1.8V to power the subsequent load.

Claims

1. A mobile phone power supply circuit, including an adapter input power supply and a battery input power supply; characterized in that, It also includes a charging chip BQ24190, a DC-DC power supply LTM4644, a first switch, and a second switch; the adapter input power supply and the battery input power supply are respectively connected to the input ports of the first switch and the second switch; the first bidirectional port of the charging chip BQ24190 is connected to the first switch, and the second bidirectional port is connected to the second switch; the adapter input power supply and the battery input are connected to the corresponding input interfaces of the charging chip BQ24190; the output ports of the first switch and the second switch are both connected to the input port of the DC-DC power supply LTM4644; When the system voltage is less than the threshold voltage, the charging chip BQ24190 outputs a low level to the first switch and a high level to the second switch. At this time, the first switch is closed and the second switch is opened, and the system and the battery are powered simultaneously through the adapter input power supply; After charging is completed, the system voltage is greater than the threshold voltage and the charging current decreases. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to the second switch, and the second switch is closed, and the adapter input power supply cuts off the charging; When the input voltage is still overloaded, the system voltage further decreases. When the system voltage is less than the battery voltage, the charging chip BQ24190 outputs a high level to the first switch, and the first switch is turned on, and the system is powered through the battery input power supply.

2. The mobile phone power supply circuit according to claim 1, characterized in that, It also includes a power management chip RK809-2, a high-power output power module DA9214, and a load; the VDD +3.8V output port of the DC-DC power supply LTM4644 is connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the power management chip RK809-2 and the VDD_A1, VDD_A2, VDD_B1, VDD_B2, and VDD_SYS interfaces of the high-power output power module DA9214; the VDDIO +1.8V output port of the DC-DC power supply LTM4644 is connected to the VCCIO interface of the high-power output power module DA9214; The V_LDO2 and V_LDO4 interfaces in the power management chip RK809-2 are respectively connected to the EN_A and EN_B interfaces in the high-power output power module DA9214, and LX_A1, LX_A2, and LXB1, LXB2 respectively output two 0.8V voltages to be connected to the backend load; The V_BUCK1 port in the power management chip RK809-2 outputs a 1.1V voltage to be connected to the backend load, the V_BUCK3 port outputs a 1.8V voltage to be connected to the backend load, the V_BUCK5 port outputs a +3.3V voltage to be connected to the backend load, and the voltage output from the V_BUCK5 port is connected to the VCC6, VCC7, and VCC8 ports to form a loop.

3. A mobile phone power supply circuit includes an adapter input power supply and a battery input power supply; characterized in that, It also includes a charging chip BQ24190, an LDO power supply TPS74401, a first switch, and a second switch; the adapter input power supply and the battery input power supply are respectively connected to the input ports of the first switch and the second switch; the first bidirectional port of the charging chip BQ24190 is connected to the first switch, and the second bidirectional port is connected to the second switch; the adapter input power supply and the battery input are connected to the corresponding input interfaces of the charging chip BQ24190; the output ports of the first switch and the second switch are both connected to the input port of the LDO power supply TPS74401; When the system voltage is less than the threshold voltage, the charging chip BQ24190 outputs a low level to the first switch and a high level to the second switch. At this time, the first switch is turned off and the second switch is turned on, and the system and the battery are powered simultaneously through the adapter input power supply; After charging is completed, the system voltage is greater than the threshold voltage and the charging current drops. When the charging current is less than the cut-off current of the preset value, the charging chip BQ24190 outputs a low level to the second switch, the second switch is turned off, and the adapter input power supply cuts off the charging; When the input voltage is still overloaded, the system voltage further drops. When the system voltage is less than the battery voltage, the charging chip BQ24190 outputs a high level to the first switch, the first switch is turned on, and the system is powered through the battery input power supply.

4. A mobile phone power supply circuit according to claim 3, characterized in that, It also includes a power management chip RK809-2, a high-power output power module DA9214, and a load; The VDD + 3.8V output ports of the first switch and the second switch are connected to the VCC1, VCC2, VCC3, VCC4, VCC5, VCC9 interfaces of the power management chip RK809-2 and the VDD_A1, VDD_A2, VDD_B1, VDD_B2, and VDD_SYS interfaces of the high-power output power module DA9214. The VDDIO + 1.8V output port of the LDO power supply TPS74401 is connected to the VCCIO interface of the high-power output power module DA9214; The V_LDO2 and V_LDO4 interfaces in the power management chip RK809-2 are respectively connected to the EN_A and EN_B interfaces in the high-power output power module DA9214. LX_A1, LX_A2, LXB1, and LXB2 respectively output two 0.8V voltages to the backend load; The V_BUCK1 port in the power management chip RK809-2 outputs a 1.1V voltage to the backend load, the V_BUCK3 port outputs a 1.8V voltage to the backend load, the V_BUCK5 port outputs a +3.3V voltage to the backend load, and the voltage output by the V_BUCK5 port is connected to the VCC6, VCC7, and VCC8 ports to form a loop.

Images