A synchronous boost power supply control circuit

Abstract

The present invention provides a synchronous boost power supply control circuit: comprising a power management unit U1, field effect tubes Q1-Q2, capacitors C1-C7, resistors R1-R7, diodes D1-D4, and inductors L1-L2; the main purpose of the invention is to provide a 100W synchronous boost and dual-cell lithium battery charging management circuit with an external power tube, supporting 5V USB input to charge dual-cell lithium batteries, and the maximum charging current at the battery end reaches 1.2A.

Description

Technical Field

[0001] The present invention belongs to the field of electronic technology, and in particular relates to a synchronous boost power supply control circuit, which can be used in the field of lithium battery charging management in particular. Background Art

[0002] The power control circuit is an important module of the power charging and discharging system. It has experienced nearly a hundred years of development and its technology is relatively mature. However, as the pace of social development accelerates, consumers' demands for miniaturization, portability, efficiency and stability of electrical equipment are increasing, leading to increasing requirements for the performance of power control circuits.

[0003] In some cases, customers require us to develop a device that can charge and discharge dual batteries and meet the requirements of high-power fast charging. The power port must be able to match the most common 5V power plug on the market. That is, to the greatest extent possible, it can meet the needs of similar industrial mobile phones, walkie-talkies, small drones and other applications. Only the readily available charging plug can be used to charge and discharge rechargeable batteries, especially rechargeable lithium batteries. Summary of the invention

[0004] In view of the above-mentioned shortcomings mentioned in the background technology, the present invention provides a synchronous boost power supply control circuit, the specific structure of which is as follows:

[0005] A synchronous boost power supply control circuit includes a power management unit (Power Management Unit, PMU) U1, field effect tubes Q1 ~ Q2, capacitors C1 ~ C7, resistors R1 ~ R7, diodes D1 ~ D4, and inductors L1 ~ L2. Among them,

[0006] The power management unit (PMU) U1 includes: IN (5V USB input) port, RED / V (charging indication and voltage adjustment) port, BLU / F (full indication and frequency adjustment) port, ISET (charging current adjustment) port, EN (boost enable (high operation) port, VDD (internal power filter) port, FB (boost feedback input) port, OUT (boost output) port, GH (upper MOS tube gate drive) port, SWD (connecting boost inductor) port, BST (connecting bootstrap capacitor) port, GL (lower MOS tube gate drive) port, BATT (connecting dual-series battery pack) port, NTC (thermistor detection) port, VCC (charging system voltage) port, first SWC (connecting charging inductor) port, and second SWC (connecting charging inductor) port. Among them

[0007] The IN (5V USB input) port of the power management unit (PMU) U1 is connected to one end of the capacitor C4, one end of the resistor R1, and one end of the inductor L1. The other end of the capacitor C4 and the other end of the resistor R1 are grounded respectively.

[0008] A common node of the IN (5V USB input) port, one end of the capacitor C4, one end of the resistor R1, and one end of the inductor L1 is the IN terminal of the control circuit.

[0009] The other end of the inductor L1 is connected to the anode of the diode D1, the first SWC (connected to the charging inductor) port of the power management unit (Power Management Unit, PMU) U1, and the second SWC (connected to the charging inductor) port of the power management unit (Power Management Unit, PMU) U1.

[0010] The cathode of the diode D1 is connected to a VCC (charging system voltage) port of a power management unit (PMU) U1, a cathode of the diode D4, and one end of the capacitor C2.

[0011] The anode of the diode D4 is connected to the other end of the capacitor C2, one end of the capacitor C1, a BATT (connecting a dual-cell series battery pack) port of a power management unit (Power Management Unit, PMU) U1, and one end of the inductor L2.

[0012] The common node of the anode of the diode D4, the other end of the capacitor C2, one end of the capacitor C1, the BATT (connecting a dual-cell series battery pack) port of the power management unit (Power Management Unit, PMU) U1, and one end of the inductor L2 is the BATT end of the control circuit.

[0013] The NTC (thermistor detection) port of the power management unit (Power Management Unit, PMU) U1 is grounded via a resistor R2.

[0014] The other end of the inductor L2, the drain of the field effect transistor Q1, one end of the capacitor C3, the SWD (connected to the boost inductor) port of the power management unit (Power Management Unit, PMU) U1, and the source of the field effect transistor Q1 are connected together.

[0015] The gate of the field effect transistor Q1 is connected to the GL (lower MOS transistor gate drive) port of the power management unit (Power Management Unit, PMU) U1. The source of the field effect transistor Q1 is grounded.

[0016] The other end of the capacitor C3 is connected to a BST (connecting a bootstrap capacitor) port of a power management unit (PMU) U1.

[0017] The gate of the field effect transistor Q2 is connected to the GH (upper MOS transistor gate drive) port of the power management unit (Power Management Unit, PMU) U1.

[0018] The source of the field effect transistor Q2 is connected to the OUT (boost output terminal) port of the power management unit (Power Management Unit, PMU) U1, one end of the resistor R5, one end of the capacitor C5, and one end of the capacitor C6.

[0019] A common node of the source of the field effect transistor Q2, the OUT (boost output) port of the power management unit (Power Management Unit, PMU) U1, one end of the resistor R5, one end of the capacitor C5, and one end of the capacitor C6 is the OUT port of this circuit.

[0020] The other end of the capacitor C5 and the other end of the capacitor C6 are both grounded.

[0021] The other end of the resistor R5 is connected to one end of the resistor R7 and the FB (boost feedback input) port of the power management unit (PMU) U1. The other end of the resistor R7 is grounded.

[0022] The VDD (internal power filter) port of the power management unit (PMU) U1 is grounded via capacitor C7.

[0023] The EN (boost enable (high operation) port of the power management unit (Power Management Unit, PMU) U1 is the EN port of this circuit.

[0024] The ISET (charging current adjustment) port of the power management unit (PMU) U1 is grounded via a resistor R6.

[0025] The BLU / F (full indication and frequency adjustment) port of the power management unit (PMU) U1 is connected to the anode of the diode D3 and one end of the resistor R4 respectively. The cathode of the diode D3 and the other end of the resistor R4 are grounded.

[0026] The RED / V (charging indication and voltage adjustment) port of the power management unit (Power Management Unit, PMU) U1 is connected to the anode of the diode D2 and one end of the resistor R3 respectively. The cathode of the diode D2 and the other end of the resistor R3 are grounded.

[0027] Furthermore, the power management unit (PMU) U1 preferably uses the 5500 chip.

[0028] Beneficial technical effects

[0029] The present invention provides a synchronous boost power supply control circuit: including a power management unit U1, field effect tubes Q1-Q2, capacitors C1-C7, resistors R1-R7, diodes D1-D4, and inductors L1-L2. The main purpose of the invention is to provide a 100W synchronous boost and dual-cell lithium battery charging management circuit with an external power tube, supporting 5V USB input to charge dual-cell lithium batteries, and the maximum charging current at the battery end is 1.2A.

[0030] With the help of this product, the conventional charging heads in customers' hands can be utilized to the greatest extent, reducing the overall manufacturing and equipment costs, and can manage the charging of two lithium batteries at the same time.

[0031] This product has the function of synchronous boosting, and the maximum transmission voltage can reach 1.2A, which can meet the needs of conventional charging.

[0032] This product has stable output power, simple structure, small heat dissipation, stable operation, and is suitable for integration with electrical equipment in a closed environment (instrument box, equipment cabin, etc.).

[0033] This product has a small external electromagnetic signal, which can effectively ensure the electromagnetic environment of electrical equipment and avoid interference with the working performance of electrical equipment due to an unstable external electromagnetic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the circuit structure of the present invention.

[0035] Figure 2 It is a PCB layout based on the present invention.

[0036] Figure 3 yes Figure 2 Schematic diagram of beimian.

[0037] Figure 4 This is the functional block diagram of JH5500 DETAILED DESCRIPTION

[0038] The structural features of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] See also Figure 1 A synchronous boost power supply control circuit includes a power management unit (Power Management Unit, PMU) U1, field effect tubes Q1 ~ Q2, capacitors C1 ~ C7, resistors R1 ~ R7, diodes D1 ~ D4, and inductors L1 ~ L2. Among them,

[0040] The power management unit (PMU) U1 includes: IN (5V USB input) port, RED / V (charging indication and voltage adjustment) port, BLU / F (full indication and frequency adjustment) port, ISET (charging current adjustment) port, EN (boost enable (high operation) port, VDD (internal power filter) port, FB (boost feedback input) port, OUT (boost output) port, GH (upper MOS tube gate drive) port, SWD (connecting boost inductor) port, BST (connecting bootstrap capacitor) port, GL (lower MOS tube gate drive) port, BATT (connecting dual-series battery pack) port, NTC (thermistor detection) port, VCC (charging system voltage) port, first SWC (connecting charging inductor) port, and second SWC (connecting charging inductor) port. Among them

[0041] The IN (5V USB input) port of the power management unit (PMU) U1 is connected to one end of the capacitor C4, one end of the resistor R1, and one end of the inductor L1. The other end of the capacitor C4 and the other end of the resistor R1 are grounded respectively.

[0042] A common node of the IN (5V USB input) port, one end of the capacitor C4, one end of the resistor R1, and one end of the inductor L1 is the IN terminal of the control circuit.

[0043] The other end of the inductor L1 is connected to the anode of the diode D1, the first SWC (connected to the charging inductor) port of the power management unit (Power Management Unit, PMU) U1, and the second SWC (connected to the charging inductor) port of the power management unit (Power Management Unit, PMU) U1.

[0044] The cathode of the diode D1 is connected to a VCC (charging system voltage) port of a power management unit (PMU) U1, a cathode of the diode D4, and one end of the capacitor C2.

[0045] The anode of the diode D4 is connected to the other end of the capacitor C2, one end of the capacitor C1, a BATT (connecting a dual-cell series battery pack) port of a power management unit (Power Management Unit, PMU) U1, and one end of the inductor L2.

[0046] The common node of the anode of the diode D4, the other end of the capacitor C2, one end of the capacitor C1, the BATT (connecting a dual-cell series battery pack) port of the power management unit (Power Management Unit, PMU) U1, and one end of the inductor L2 is the BATT end of the control circuit.

[0047] The NTC (thermistor detection) port of the power management unit (Power Management Unit, PMU) U1 is grounded via a resistor R2.

[0048] The other end of the inductor L2, the drain of the field effect transistor Q1, one end of the capacitor C3, the SWD (connected to the boost inductor) port of the power management unit (Power Management Unit, PMU) U1, and the source of the field effect transistor Q1 are connected together.

[0049] The gate of the field effect transistor Q1 is connected to the GL (lower MOS transistor gate drive) port of the power management unit (Power Management Unit, PMU) U1. The source of the field effect transistor Q1 is grounded.

[0050] The other end of the capacitor C3 is connected to a BST (connecting a bootstrap capacitor) port of a power management unit (PMU) U1.

[0051] The gate of the field effect transistor Q2 is connected to the GH (upper MOS transistor gate drive) port of the power management unit (Power Management Unit, PMU) U1.

[0052] The source of the field effect transistor Q2 is connected to the OUT (boost output terminal) port of the power management unit (Power Management Unit, PMU) U1, one end of the resistor R5, one end of the capacitor C5, and one end of the capacitor C6.

[0053] A common node of the source of the field effect transistor Q2, the OUT (boost output) port of the power management unit (Power Management Unit, PMU) U1, one end of the resistor R5, one end of the capacitor C5, and one end of the capacitor C6 is the OUT port of this circuit.

[0054] The other end of the capacitor C5 and the other end of the capacitor C6 are both grounded.

[0055] The other end of the resistor R5 is connected to one end of the resistor R7 and the FB (boost feedback input) port of the power management unit (PMU) U1. The other end of the resistor R7 is grounded.

[0056] The VDD (internal power filter) port of the power management unit (PMU) U1 is grounded via capacitor C7.

[0057] The EN (boost enable (high operation) port of the power management unit (Power Management Unit, PMU) U1 is the EN port of this circuit.

[0058] The ISET (charging current adjustment) port of the power management unit (PMU) U1 is grounded via a resistor R6.

[0059] The BLU / F (full indication and frequency adjustment) port of the power management unit (PMU) U1 is connected to the anode of the diode D3 and one end of the resistor R4 respectively. The cathode of the diode D3 and the other end of the resistor R4 are grounded.

[0060] The RED / V (charging indication and voltage adjustment) port of the power management unit (Power Management Unit, PMU) U1 is connected to the anode of the diode D2 and one end of the resistor R3 respectively. The cathode of the diode D2 and the other end of the resistor R3 are grounded.

[0061] Figure 2 It is a PCB layout based on the present invention.

[0062] Furthermore, the power management unit (Power Management Unit, PMU) U1 includes: a first PGC (charging PWM power ground) port, a second PGC (charging PWM power ground) port, and a GND (internal power ground) port, all of which are grounded.

[0063] Furthermore, the resistors R1, R3, R4 and R6 are all 10KΩ. The resistors R5, R7 and R2 are adjustable resistors, and the adjustment range is 0.1 to 200KΩ.

[0064] Furthermore, the diode D1 is of model SS24, the diode D4 is of model SS14, and both the diodes D2 and D3 are light emitting diodes.

[0065] Furthermore, the capacitors C1, C2, C4 and C5 are all 10 μF, the capacitor C3 is 100 μF and the capacitor C7 is 4.7 μF.

[0066] Furthermore, the capacitor C6 is 100 μF. The capacitor C6 has polarity. The negative electrode of the capacitor C6 is grounded.

[0067] Furthermore, the inductors L1 and L2 are both 3.3 μH.

[0068] Furthermore, the adjustable full preset voltage of the circuit has high precision: the adjustable full preset voltage VFULL=8.4V / 8.5V / 8.55V / 8.6V (±1.0%).

[0069] The output voltage of this circuit has high accuracy: output voltage VOUT = 9 ~ 24V (± 2.5%).

[0070] When the total power is 100W, the continuous output current of this circuit is large: IOP=12A.

[0071] This circuit has built-in USB charging undervoltage protection: VINFL = 4.5V

[0072] When charging, the LED indicator of this circuit is always on and goes out when fully charged.

[0073] The package of this circuit is eLQFN20, 4×4mm.

[0074] The power management unit (PMU) U1 preferably uses the 5500 chip. The functions of the lead-out terminals / pins of the chip are shown in the following table.

[0075]

[0076]

[0077] Maximum Ratings(T A =25℃)

[0078] When the temperature TA of the external environment is 25°C, the working parameters of the present invention are shown in the following table:

[0079] Parameter name symbol Numeric unit VDD <![CDATA[V MAX ]]> -0.3～6.0 V EN, IN, SWC, BATT, VCC <![CDATA[V MAX ]]> -0.3～12 V OUT、SWD <![CDATA[V MAX ]]> -0.3～30 V GL, FB, LED, ISET, VSET, NTC <![CDATA[V MAX ]]> <![CDATA[0.3~V CC +0.3]]> V BST <![CDATA[V MAX ]]> <![CDATA[V SWD -0.3~V SWD +0.3]]> V GH <![CDATA[V MAX ]]> <![CDATA[V BST -0.3~V BST +0.3]]> V SW maximum current <![CDATA[I MAX ]]> 20 A Operating temperature <![CDATA[T OPE ]]> -40 to +85 ℃ Storage temperature <![CDATA[T STG ]]> -60 to +150 ℃ Reflow temperature <![CDATA[T SOLD ]]> 300 ℃

[0080] Note: The maximum power consumption depends on three factors: T JMCSC , T A and θ JA , the calculation formula is P DMCSC =(T JMCSC -T A ) / θ JA . JH5500 circuit T JMCSC=125℃, T A is the temperature of the external environment, θ JA Depends on the different package types (QFN package type θ JA The larger the external heat dissipation area, the lower the thermal resistance.

[0081] When V IN =5V, V BATT =7.2V, the electrical characteristics of this circuit are as follows:

[0082]

[0083]

[0084] JH5500 is mainly composed of three modules: boost conversion, switch charging, and LDO regulator. The boost module can output 9~24V. When there is an external power supply, it starts to charge the lithium battery until the battery is fully charged. EN can control the boost output to work or standby, and it can be suspended in standby. The functional block diagram of JH5500 is detailed in Figure 3 This chip is a new chip launched by our company. The circuit using this chip has the following performance:

[0085] Preset charging voltage: According to the different requirements of lithium batteries, the ground resistor R VSET The resistance value sets the lithium battery pre-charge voltage. See the table below for typical voltage and recommended resistance:

[0086]

[0087]

[0088] Preset charging current: The charging current can be set by the RISET resistor according to different requirements.

[0089] The normal charging current value is: Where V ISET =0.8V. If R ISET =3.3KΩ, the charging current is 970mA.

[0090] The actual test efficiency is shown in the following table:

[0091]

[0092] Trickle charge current: When the battery voltage is lower than 5.85V, it enters trickle charge, and the trickle current is:

[0093]

[0094] Charging termination: When the battery voltage reaches the preset voltage and the battery consumption current is less than IEND, charging is terminated:

[0095]

[0096] Recharge voltage: If the battery voltage drops to V RECHG =8.2V or less, the charger will charge again.

[0097] Charging time protection: Trickle charge for 3 hours or normal charge for 12 hours. If it is not fully charged, stop charging. It is a bad battery by default. When the EN pin is set high, the charging time is not recorded during boost discharge.

[0098] Charging internal thermal regulation protection: JH5500 will monitor the internal temperature in charging mode. When the chip temperature rises to TFB (120°C), the charging current will be reduced.

[0099] Charging thermal protection NTC: The NTC foot will output a 10uA current I NTC , the startup threshold of NTC is V NTC =2.8V, equivalent resistance 280K.

[0100] Input adaptive voltage: For different adapters, when the USB input voltage is lower than 4.5V (V INREG ), the charging current will be adaptively reduced. This function will not cause the adapter to be overloaded and damaged.

[0101] The working parameters of the LED charging indicator are as follows:

[0102] LED Status-Type 1

[0103] Pin Normal Precharge Charge Full Overtime RED Z Always on Always on Z Always on BLU Z Z Z Always on Z

[0104] LED Status-Type 2 (reservation required)

[0105] Pin Normal Precharge Charge Full Overtime RED Z 1 / 4HZ flashing 1 / 4HZ flashing Z Always on BLU Z Z Z Always on Z

[0106] LDO voltage regulator: The system power supply is linearly stepped down from OUT to obtain a higher voltage, typically V DD =5.15V, the system voltage has no load capacity, so it cannot be used externally to avoid damaging the circuit. The maximum supported current is 8mA. If V DD Too low a voltage will shut down the boost.

[0107] Boost converter: JH5500 integrates a Boost synchronous boost charge controller with standby function, switching frequency 380~700KHz, 7.4V lithium battery input, output 9~24V. Over-temperature and over-current protection are added to prevent the converter from overloading. Therefore, this circuit has the above functions.

[0108] Low voltage detection: When the battery drops below vbatfl (5.8v), the controller will reduce the output current to prevent the battery from further discharging and causing the battery voltage to be too low for protection. When the battery drops below Voff (5.55v), the Boost synchronous boost charge controller stops working and does not boost the voltage. Even if the battery voltage rises again to exceed Voff (5.55v), the lock will not be released. When the adapter voltage is applied to the circuit, it will be unlocked and released.

[0109] The actual test efficiency of this product is shown in the following table:

[0110] Lithium battery input voltage (V) Boost output voltage (V) Boost output power (W) Conversion efficiency (%) 6.12V 12.12V 20W 93.5％ 7.40V 12.12V 20W 95.0％ 8.40V 12.12V 20W 96.5％ 6.12V 12.12V 40W 93.5％ 7.40V 12.12V 40W 95.5％ 8.40V 12.12V 40W 96％ 6.12V 12.12V 60W 93％ 7.40V 12.12V 60W 95％ 8.40V 12.12V 60W 95.4％

[0111] If the MOS tube V DS >0.25V, it will enter overcurrent protection and reduce the output power, which means the total power is constant and can be designed as an 80W power supply. The output voltage is set according to the feedback resistor and V FB The voltage is calculated.

[0112] VOUT RH RL 9V 330K 150K 12V 330K 100K 15V 330K 75K 18V 330K 60K 21V 330K 51K 24V 330K 43K

[0113] The switching frequency can be selected by connecting an external resistor RFREQ to PIN5:

[0114] <![CDATA[R FREQ ]]> <![CDATA[f SW ]]> 10kΩ 740kHz 33kΩ 620kHz 100kΩ 500kHz 330kΩ 380kHz

[0115] Charging protection: JH5500 has perfect protection functions. Built-in soft start function can prevent malfunction caused by excessive inrush current at startup, and integrated output overcurrent, short circuit, undervoltage, overtemperature and other protection functions to ensure stable and reliable operation of the system.

[0116] See also Figure 2 and Figure 3 All bypass capacitors of this product should be as close to the circuit pins as possible. The capacitor of 8-pin VDD must be close to the IC. VOUT uses 2 22uF and 1 220uF high-frequency low-resistance electrolytic. The bottom of the IC is covered with copper for lithium battery charging and heat dissipation. Several vias are made at the bottom of the IC. The MOS tube is covered with copper for boost power dissipation and heat dissipation. In order to avoid interference with radio, the inductor SW network routing should be as short as possible. When searching for radio stations, the boost circuit can be turned off first (PIN7 is set low). PIN7 has an internal 1M pull-down, which is standby when left unconnected and normal operation when connected high. The output power can be 80W (the output voltage is adjustable), and there is a battery overcharge and over-discharge protection circuit inside the circuit. It is recommended not to save the battery protection board if the cost allows.

[0117] In summary, the present invention is a 100W synchronous boost and dual-cell lithium battery charging management circuit with an external power tube, which supports 5V USB input to charge dual-cell lithium batteries, and the maximum charging current at the battery end is 1.2A. The present invention has the following technical features: built-in USB charging switch control circuit with current limiting function. Built-in switch lithium battery charging mode with adjustable charging current. Constant current and constant voltage charging mode with temperature regulation control. Supports lithium battery 0V charging and ultra-low ripple at low power. High-precision adjustable full preset voltage: VFULL=8.4V / 8.5V / 8.55V / 8.6V (±1.0%). High-precision output voltage: VOUT=9~24V (±2.5%). Large continuous output current: IOP=12A (total power 100W). Built-in USB charging undervoltage protection: VINFL=4.5V. LED indicator is long-on during charging and goes out after full. Package form: eLQFN204×4mm.

Claims

1. A synchronous boost power supply control circuit, characterized in that: It includes a power management unit U1, field effect transistors Q1~Q2, capacitors C1~C7, resistors R1~R7, diodes D1~D4, and inductors L1~L2; among which: The power management unit U1 includes: an IN port, a RED / V port, a BLU / F port, an ISET port, an EN port, a VDD port, an FB port, an OUT port, a GH port, a SWD port, a BST port, a GL port, a BATT port, an NTC port, a VCC port, a first SWC port of the power management unit U1, and a second SWC port of the power management unit U1; wherein, The IN port of the power management unit U1 is connected to one end of the capacitor C4, one end of the resistor R1, and one end of the inductor L1; the other end of the capacitor C4 and the other end of the resistor R1 are grounded respectively; The common node of the IN port, one end of the capacitor C4, one end of the resistor R1, and one end of the inductor L1 is the IN terminal of the control circuit; The other end of the inductor L1 is connected to the anode of the diode D1, the first SWC port of the power management unit U1, and the second SWC port of the power management unit U1; The cathode of the diode D1 is connected to the VCC port of the power management unit U1, the cathode of the diode D4, and one end of the capacitor C2; The anode of the diode D4 is connected to the other end of the capacitor C2, one end of the capacitor C1, the BATT port of the power management unit U1, and one end of the inductor L2; The common node of the positive electrode of the diode D4, the other end of the capacitor C2, one end of the capacitor C1, the BATT port of the power management unit U1, and one end of the inductor L2 is the BATT end of the control circuit; The NTC port of the power management unit U1 is grounded via the resistor R2; The other end of the inductor L2, the drain of the field effect transistor Q1, one end of the capacitor C3, the SWD port of the power management unit U1, and the source of the field effect transistor Q1 are connected together; The gate of the field effect transistor Q1 is connected to the GL port of the power management unit U1; the source of the field effect transistor Q1 is grounded; The other end of the capacitor C3 is connected to the BST port of the power management unit U1; The gate of the field effect transistor Q2 is connected to the GH port of the power management unit U1; The source of the field effect transistor Q2 is connected to the OUT port of the power management unit U1, one end of the resistor R5, one end of the capacitor C5, and one end of the capacitor C6; The common node of the source of the field effect transistor Q2, the OUT port of the power management unit U1, one end of the resistor R5, one end of the capacitor C5, and one end of the capacitor C6 is the OUT port of this circuit; The other end of the capacitor C5 and the other end of the capacitor C6 are both grounded; The other end of the resistor R5 is connected to one end of the resistor R7 and the FB port of the power management unit U1; the other end of the resistor R7 is grounded; The VDD port of the power management unit U1 is connected to ground via capacitor C7; The EN port of the power management unit U1 is the EN port of this circuit; The ISET port of the power management unit U1 is grounded via resistor R6; The BLU / F port of the power management unit U1 is connected to the anode of the diode D3 and one end of the resistor R4 respectively; the cathode of the diode D3 and the other end of the resistor R4 are grounded; The RED / V port of the power management unit U1 is connected to the anode of the diode D2 and one end of the resistor R3 respectively; the cathode of the diode D2 and the other end of the resistor R3 are grounded.

2. A synchronous boost power supply control circuit according to claim 1, characterized in that: The power management unit U1 includes: a first PGC port, a second PGC port, and a GND port. The first PGC port, the second PGC port, and the GND port are all grounded.

3. The synchronous boost power supply control circuit according to claim 1, characterized in that: The resistors R1, R3, R4 and R6 are all 10KΩ; the resistors R5, R7 and R2 are adjustable resistors, and the adjustment range is 0.1KΩ to 200KΩ.

4. The synchronous boost power supply control circuit according to claim 1, characterized in that: The diode D1 is of model SS24, the diode D4 is of model SS14, and both the diodes D2 and D3 are light emitting diodes.

5. The synchronous boost power supply control circuit according to claim 1, characterized in that: The capacitors C1, C2, C4 and C5 are all 10 μF, the capacitor C3 is 100 μF and the capacitor C7 is 4.7 μF.

6. The synchronous boost power supply control circuit according to claim 1, characterized in that: The capacitor C6 is 100 μF; the capacitor C6 has polarity; and the negative electrode of the capacitor C6 is grounded.

7. The synchronous boost power supply control circuit according to claim 1, characterized in that: The inductors L1 and L2 are both 3.3μH.

8. The synchronous boost power supply control circuit according to claim 1, characterized in that: The adjustable full preset voltage of this circuit has high precision: adjustable full preset voltage VFULL=8.4V / 8.5V / 8.55V / 8.6V; The output voltage accuracy of this circuit is high: output voltage VOUT=9~24V±2.5%; When the total power is 100W, the continuous output current of this circuit is large: IOP=12A; This circuit has built-in USB charging undervoltage protection, and the input voltage of USB charging undervoltage protection VINFL=4.5V; when charging, the LED indicator of this circuit is always on and goes out after being fully charged; the package of this circuit is eLQFN20, 4×4mm.

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