Charging and discharging control method based on farad capacitor and lithium battery

Abstract

The invention provides a charging and discharging control method based on a farad capacitor and a lithium battery, and the method comprises the steps: when a power supply is connected, a logic switching circuit is disconnected, a current limiting circuit is connected, and the power supply charges a farad capacitor assembly through the current limiting circuit after being boosted by a booster circuit; when the electric quantity of the farad capacitor assembly reaches a preset value, the processor controls the booster circuit to stop working and controls the logic switch circuit to be switched on at the same time, and the power supply charges the lithium battery through the logic switch circuit and the battery charging circuit. When a load is connected, if the voltage of the farad capacitor assembly is within a voltage input value range required by the step-up and step-down circuit to work, the step-up and step-down circuit is switched on, the farad capacitor assembly supplies power to the load at a first voltage value after passing through the step-up and step-down circuit, and meanwhile, the output switch circuit is switched off; and when the farad capacitor assembly discharges until the farad capacitor assembly cannot supply power to the load at the first voltage value, the buck-boost circuit is disconnected, the output switch circuit is connected at the same time, and the lithium battery supplies power to the load at the second voltage value through the output switch circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply circuits, and in particular to a charge and discharge control method based on a farad capacitor and a lithium battery. Background Art

[0002] As the most common energy storage component, lithium batteries are widely used in electronic devices such as mobile phones, cameras, and laptops due to their excellent properties such as high energy density, fast charging and discharging, and low self-discharge rate.

[0003] However, with the rapid development of electronic devices, users' demands for power management of electronic devices are constantly increasing. The single lithium battery power supply mode can no longer meet the challenges of these devices in terms of battery life, fast charging and discharging, and high power output requirements. In traditional electronic device power management systems, lithium batteries are often responsible for power supply, resulting in frequent charging and discharging of lithium batteries, which will lead to a decline in performance over time, thereby shortening their service life.

[0004] In recent years, as a new type of energy storage element, farad capacitors have gradually attracted widespread attention due to their advantages such as fast charging and discharging speed, long cycle life, and high power density. Therefore, how to achieve the complementary advantages of lithium batteries and farad capacitors and extend the service life of lithium batteries is an urgent problem to be solved. Summary of the invention

[0005] The present invention provides a charge and discharge control method and circuit based on a farad capacitor and a lithium battery, which are used to solve the defect in the prior art that the lithium battery is frequently charged and discharged and thus shortens its service life, thereby achieving complementary advantages between the lithium battery and the farad capacitor and extending the service life of the lithium battery.

[0006] On the one hand, the present invention provides a charge and discharge control method based on a farad capacitor and a lithium battery, comprising:

[0007] When the power supply is connected, the logic switch circuit is disconnected, the current limiting circuit is turned on, and the power supply is boosted by the boost circuit and then charges the farad capacitor component through the current limiting circuit;

[0008] When the power of the farad capacitor component reaches a preset value, the processor controls the boost circuit to stop working, and controls the logic switch circuit to be turned on, and the power supply charges the lithium battery through the logic switch circuit and the battery charging circuit;

[0009] When the load is connected, if the voltage of the farad capacitor component is within the voltage input value range required for the buck-boost circuit to work, the buck-boost circuit is turned on, and the farad capacitor component supplies power to the load at the first voltage value after passing through the buck-boost circuit, and at the same time, the output switch circuit is disconnected;

[0010] When the farad capacitor component is discharged to the point where it cannot supply power to the load at the first voltage value, the buck-boost circuit is disconnected, and the output switch circuit is turned on, and the lithium battery supplies power to the load at the second voltage value through the output switch circuit;

[0011] Among them, the power supply is connected to the current limiting circuit through the first inductor and the first rectifier diode in sequence; the boost circuit includes a boost chip, the boost chip has 6 pins, pin 1 of the boost chip is connected to the positive electrode of the first rectifier diode, pin 2 of the boost chip is grounded, pin 3 of the boost chip is grounded through the third resistor, pin 4 of the boost chip is connected to the controller, pin 4 of the boost chip is also connected to the power supply through the eighteenth resistor, pin 5 of the boost chip is connected to the negative electrode of the first rectifier diode, pin 5 of the boost chip is also connected to pin 3 of the boost chip through the first resistor, and pin 6 of the boost chip is suspended; the current limiting circuit includes a current limiting chip, the current limiting chip has 5 pins, pin 5 of the current limiting chip is connected to the negative electrode of the first rectifier diode, pin 2 of the current limiting chip is grounded, pin 4 of the current limiting chip is connected to pin 5 of the current limiting chip, pin 3 of the current limiting chip is grounded through the second resistor, pin 1 of the current limiting chip is connected to the positive electrode of the farad capacitor assembly, and the negative electrode of the farad capacitor assembly is grounded.

[0012] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, the buck-boost circuit includes a buck-boost chip, the buck-boost chip has 10 pins, pin 5 of the buck-boost chip is connected to the positive electrode of the farad capacitor assembly, pin 4 of the buck-boost chip is connected to pin 2 of the buck-boost chip through a second inductor, pins 8, 6 and 7 of the buck-boost chip are all connected to pin 5 of the buck-boost chip through a sixth resistor, pin 9 of the buck-boost chip is grounded, pin 3 of the buck-boost chip is grounded, pin 10 of the buck-boost chip is connected to pin 1 of the buck-boost chip through a seventh resistor, pin 10 of the buck-boost chip is also grounded through an eighth resistor, and pin 1 of the buck-boost chip is connected to the load through a second rectifier diode.

[0013] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, the farad capacitor assembly includes a first farad capacitor and a second farad capacitor connected in series, the positive electrode of the first farad capacitor is the positive electrode of the farad capacitor assembly, and the negative electrode of the second farad capacitor is the negative electrode of the farad capacitor assembly.

[0014] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, pin 4 of the boost chip is a switch pin. During the charging of the farad capacitor component, pin 4 of the boost chip is at a high level, so that the boost chip works normally.

[0015] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, during the charging of the farad capacitor component, the processor will detect the power of the farad capacitor component in real time. When the power of the farad capacitor component reaches 90% of the full charge state, the processor controls the 4th pin of the boost chip to a low level, so that the boost chip stops working.

[0016] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, pin 4 of the current limiting chip is a switch pin, and when the power is connected, the current limiting chip is in an open state.

[0017] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, pin 6 of the buck-boost chip is a switch pin. When the load is connected, pin 6 of the buck-boost chip is a high level, and the buck-boost chip remains in an open and conductive state.

[0018] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, the logic switch circuit includes a PMOS tube, the S pole of the PMOS tube is connected to the power supply, the G pole of the PMOS tube is connected to the processor through a thirteenth resistor, the D pole of the PMOS tube is connected to the battery charging circuit, and the G pole of the PMOS tube is also connected to the S pole of the PMOS tube through an eleventh resistor, so that during the charging of the farad capacitor component, the G pole of the PMOS tube is at a high level and the PMOS tube remains in a disconnected state.

[0019] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, the processor controls the G pole of the PMOS tube to be at a low level, so that the PMOS tube is in a conducting state.

[0020] According to a charging and discharging control method based on a farad capacitor and a lithium battery provided by the present invention, the battery charging circuit includes a charging management chip, the charging management chip has 9 pins, pin 4 of the charging management chip is connected to the D pole of the PMOS tube, pin 8 of the charging management chip is connected to pin 4 of the charging management chip, pin 7 of the charging management chip is suspended, pin 6 of the charging management chip is grounded through a fourteenth resistor, pin 3 of the charging management chip is grounded, pin 2 of the charging management chip is grounded through a fifteenth resistor, pin 1 of the charging management chip is connected to the lithium battery, pin 1 of the charging management chip is also connected to pin 4 of the charging management chip through a ninth resistor, and pin 1 of the charging management chip is also grounded through a sixteenth resistor, pin 9 of the charging management chip is grounded, and pin 9 of the charging management chip is also connected to pin 5 of the charging management chip through an eleventh capacitor, and pin 5 of the charging management chip is also connected to the lithium battery and the output switch circuit respectively.

[0021] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, the lithium battery has an NTC pin, the NTC pin of the lithium battery is connected to pin 1 of a charging management chip, the negative electrode of the lithium battery is grounded, the positive electrode of the battery is connected to pin 5 of the charging management chip, and the positive electrode of the battery is also connected to an output switching circuit.

[0022] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, the output switch circuit includes a switch chip, the switch chip has 5 pins, pin 1 of the switch chip is connected to the load, pin 2 of the switch chip is grounded, pin 3 of the switch chip is connected to pin 5 of the switch chip through a seventeenth resistor, pin 4 of the switch chip is connected to pin 5 of the switch chip, and pin 5 of the switch chip is respectively connected to the positive electrode of the lithium battery and pin 5 of the charging management chip.

[0023] According to a charge and discharge control method based on a farad capacitor and a lithium battery provided by the present invention, pin 4 of the switch chip is a switch pin. During the discharge of the lithium battery, pin 4 of the switch chip is a high level, so that the switch chip is in an open and conductive state; if the farad capacitor component powers the load, the switch chip is in a closed and disconnected state.

[0024] On the other hand, the present invention also provides a charge and discharge control circuit based on a farad capacitor and a lithium battery, comprising: a power connection terminal, a processor, a load connection terminal, a farad capacitor component and a lithium battery;

[0025] The power connection end is connected to the farad capacitor assembly through a current limiting circuit, a boost circuit is provided on the line connecting the power connection end and the current limiting circuit, and the farad capacitor assembly is connected to the load connection end through the boost-boost circuit;

[0026] The power connection terminal is also connected to the lithium battery through the logic switch circuit and the battery charging circuit in sequence, and the lithium battery is connected to the load connection terminal through the output switch circuit;

[0027] The processor is respectively connected to the power connection terminal, the boost circuit, the farad capacitor component, and the logic switch circuit.

[0028] According to a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention, the boost circuit includes a boost chip, the boost chip has 6 pins, pin 1 of the boost chip is connected to the positive electrode of the first rectifier diode, pin 2 of the boost chip is grounded, pin 3 of the boost chip is grounded through a third resistor, pin 4 of the boost chip is connected to the controller, pin 4 of the boost chip is also connected to the power connection end through an eighteenth resistor, pin 5 of the boost chip is connected to the negative electrode of the first rectifier diode, pin 5 of the boost chip is also connected to pin 3 of the boost chip through a first resistor, and pin 6 of the boost chip is suspended.

[0029] According to a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention, the current limiting circuit includes a current limiting chip, the current limiting chip has 5 pins, pin 5 of the current limiting chip is connected to the negative electrode of the first rectifier diode, pin 2 of the current limiting chip is grounded, pin 4 of the current limiting chip is connected to pin 5 of the current limiting chip, pin 3 of the current limiting chip is grounded through a second resistor, pin 1 of the current limiting chip is connected to the positive electrode of the farad capacitor assembly, and the negative electrode of the farad capacitor assembly is grounded.

[0030] According to a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention, the buck-boost circuit includes a buck-boost chip, the buck-boost chip has 10 pins, pin 5 of the buck-boost chip is connected to the positive electrode of the farad capacitor assembly, pin 4 of the buck-boost chip is connected to pin 2 of the buck-boost chip through a second inductor, pins 8, 6 and 7 of the buck-boost chip are all connected to pin 5 of the buck-boost chip through a sixth resistor, pin 9 of the buck-boost chip is grounded, pin 3 of the buck-boost chip is grounded, pin 10 of the buck-boost chip is connected to pin 1 of the buck-boost chip through a seventh resistor, pin 10 of the buck-boost chip is also grounded through an eighth resistor, and pin 1 of the buck-boost chip is connected to a load connection terminal through a second rectifier diode; wherein, pin 1 of the buck-boost chip is connected to the positive electrode of the second rectifier diode, and the negative electrode of the second rectifier diode is connected to the load connection terminal.

[0031] According to a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention, the farad capacitor assembly includes a first farad capacitor and a second farad capacitor connected in series, the positive electrode of the first farad capacitor is the positive electrode of the farad capacitor assembly, the negative electrode of the second farad capacitor is the negative electrode of the farad capacitor assembly, and the first farad capacitor and the second farad capacitor are of the same model.

[0032] According to a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention, the logic switch circuit includes a PMOS tube, the S pole of the PMOS tube is connected to the power connection end, the G pole of the PMOS tube is connected to the processor through a thirteenth resistor, the D pole of the PMOS tube is connected to the battery charging circuit, and the G pole of the PMOS tube is also connected to the S pole of the PMOS tube through an eleventh resistor.

[0033] According to a charging and discharging control circuit based on a farad capacitor and a lithium battery provided by the present invention, the battery charging circuit includes a charging management chip, the charging management chip has 9 pins, pin 4 of the charging management chip is connected to the D pole of the PMOS tube, pin 8 of the charging management chip is connected to pin 4 of the charging management chip, pin 7 of the charging management chip is suspended, pin 6 of the charging management chip is grounded through a fourteenth resistor, pin 3 of the charging management chip is grounded, pin 2 of the charging management chip is grounded through a fifteenth resistor, pin 1 of the charging management chip is connected to the lithium battery, pin 1 of the charging management chip is also connected to pin 4 of the charging management chip through a ninth resistor, and pin 1 of the charging management chip is also grounded through a sixteenth resistor, pin 9 of the charging management chip is grounded, and pin 9 of the charging management chip is also connected to pin 5 of the charging management chip through an eleventh capacitor, and pin 5 of the charging management chip is also connected to the lithium battery and the output switch circuit respectively.

[0034] According to a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention, the lithium battery has an NTC pin, the NTC pin of the lithium battery is connected to pin 1 of a charging management chip, the negative electrode of the lithium battery is grounded, the positive electrode of the lithium battery is connected to pin 5 of the charging management chip, and the positive electrode of the lithium battery is also connected to an output switching circuit.

[0035] According to a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention, the output switch circuit includes a switch chip, the switch chip has 5 pins, pin 1 of the switch chip is connected to the load connection end, pin 2 of the switch chip is grounded, pin 3 of the switch chip is connected to pin 5 of the switch chip through a seventeenth resistor, pin 4 of the switch chip is connected to pin 5 of the switch chip, and pin 5 of the switch chip is respectively connected to the positive electrode of the lithium battery and pin 5 of the charging management chip.

[0036] The present invention provides a charge and discharge control method and circuit based on a farad capacitor and a lithium battery. During the charging process, when an external power supply is connected, the boost chip and the current limiting chip start working. The power supply first passes through the boost circuit for boost processing so that the voltage meets the charging requirements of the farad capacitor component, and controls the size of the charging current through the current limiting circuit to prevent the circuit from being damaged by excessive current, while the logic switch circuit remains disconnected. At this time, the farad capacitor component begins to store electricity until its electricity reaches a preset value, and the processor controls the boost circuit to stop working, so that the power supply cannot continue to charge the farad capacitor component. At the same time, the processor controls the logic switch circuit to be turned on, and the power supply directly charges the lithium battery through the logic switch circuit and the battery charging circuit.

[0037] During the discharge process, when the load is connected, if the voltage of the farad capacitor assembly is still within the voltage input value range required for the buck-boost circuit to work, the buck-boost circuit starts to work. The buck-boost circuit directly supplies power to the load by adjusting the voltage of the farad capacitor assembly to a first voltage value. At the same time, the output switch circuit remains disconnected, so that the lithium battery is in a non-working state and does not participate in the power supply of the circuit. As the farad capacitor assembly continues to discharge, when its voltage drops to a level that is insufficient to maintain the first voltage value to continue to supply power to the load, the buck-boost circuit automatically disconnects, the output switch circuit is turned on, and the lithium battery begins to supply power to the load at a second voltage value (lower than the first voltage value) through the output switch circuit.

[0038] In summary, the technical solution provided by the present invention has the following beneficial effects:

[0039] 1. By setting the circuit logic, the farad capacitor component can be charged and discharged first, reducing the frequent charging and discharging of the lithium battery and extending the service life of the lithium battery;

[0040] 2. When the farad capacitor assembly supplies power to the load, the lithium battery is in a non-working state and does not participate in the power supply of the circuit, thus avoiding heating of the lithium battery and causing aging of the lithium battery;

[0041] 3. When the power of the farad capacitor component is low, the circuit can seamlessly switch to lithium battery power supply to ensure the continuous and stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is an electrical block diagram of a charge and discharge control circuit based on a farad capacitor and a lithium battery provided by the present invention;

[0044] Figure 2 It is a circuit diagram of the power supply connection terminal, the farad capacitor component and the load connection terminal;

[0045] Figure 3 It is a circuit diagram of the power connection terminal, lithium battery and load connection terminal. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Combine the following Figure 1-Figure 3 The present invention describes a charge and discharge control method and circuit based on a farad capacitor and a lithium battery. The control method and circuit are suitable for handheld electronic devices. The internal circuit of the electronic device is equipped with two types of energy storage elements, a farad capacitor and a lithium battery. At the same time, the electronic device is equipped with a corresponding power adapter. When the electronic device is connected to the power adapter, the internal circuit enters a charging state. When the electronic device is working, the internal circuit enters a discharging state. The electronic device can be charged and discharged at the same time, or it can be charged or discharged alone.

[0048] On the one hand, the present invention provides a charge and discharge control method based on a farad capacitor and a lithium battery, comprising:

[0049] When the power supply is connected, the logic switch circuit is disconnected, the current limiting circuit is turned on, and the power supply is boosted by the boost circuit and then charges the farad capacitor component through the current limiting circuit;

[0050] When the power of the farad capacitor assembly reaches a preset value, the processor controls the boost circuit to stop working, and controls the logic switch circuit to be turned on, so that the power supply charges the lithium battery through the logic switch circuit and the battery charging circuit; wherein the rated voltage of the farad capacitor assembly is greater than the power supply voltage;

[0051] When the load is connected, if the voltage of the farad capacitor component is within the voltage input value range required for the buck-boost circuit to work, the buck-boost circuit is turned on, and the farad capacitor component supplies power to the load at the first voltage value after passing through the buck-boost circuit, and at the same time, the output switch circuit is disconnected;

[0052] When the farad capacitor component is discharged to the point where it cannot supply power to the load at the first voltage value, the buck-boost circuit is disconnected, and the output switch circuit is turned on, and the lithium battery supplies power to the load at the second voltage value through the output switch circuit.

[0053] That is to say, in this application, when the power supply is connected for charging, the farad capacitor component will be charged first, and when the farad capacitor component is charged to a preset level, the farad capacitor component will be stopped from being charged and the lithium battery will be charged instead;

[0054] When the load is connected (i.e., discharged), if there is a certain amount of electricity in the farad capacitor component, the farad capacitor component is used to power the load first. When the electricity of the farad capacitor component is reduced to a certain level and the buck-boost circuit cannot work, the output voltage of the buck-boost circuit can be considered to be zero, and then the load is powered by the lithium battery.

[0055] In the present application, since the farad capacitor assembly and the lithium battery are respectively connected to the load, the circuit is configured so that whichever power supply line has a higher voltage will be used first to supply power to the load. In the present application, the farad capacitor assembly corresponds to a first voltage value after boosting or stepping down, and the lithium battery corresponds to a second voltage value. Therefore, by setting the first voltage value to be greater than the second voltage value, it can be ensured that the farad capacitor assembly is used first for power supply. That is to say, when the amount of electricity in the farad capacitor assembly can maintain the operation of the buck-boost circuit, the buck-boost circuit can output a voltage of the first voltage value. If the first voltage value is higher than the second voltage value, the first voltage value will be used first for power supply until the first voltage value disappears.

[0056] The power supply is connected to the current limiting circuit through the first inductor L1 and the first rectifier diode D1 in sequence; specifically, the first inductor L1 is connected to the positive electrode of the first rectifier diode D1, and the negative electrode of the first rectifier diode D1 is connected to the current limiting circuit;

[0057] The boost circuit includes a boost chip U2, which has 6 pins, namely, pin 1 (SW), pin 2 (GND), pin 3 (FB), pin 4 (EN), pin 5 (VS), and pin 6 (NC). Pin 1 of the boost chip U2 is connected to the positive electrode of the first rectifier diode D1, pin 2 of the boost chip U2 is grounded, pin 3 of the boost chip U2 is grounded through a third resistor R3, pin 4 of the boost chip U2 is connected to the controller, pin 4 of the boost chip U2 is also connected to the power supply through an eighteenth resistor R18, pin 5 of the boost chip U2 is connected to the negative electrode of the first rectifier diode D1, pin 5 of the boost chip U2 is also connected to pin 3 of the boost chip U2 through the first resistor R1, and pin 6 of the boost chip U2 is left floating;

[0058] Furthermore, in terms of circuit design, pin 4 of the boost chip U2 is also grounded via a second capacitor C2.

[0059] The current limiting circuit includes a current limiting chip U1, which has 5 pins, namely, pin 1 (VOUT), pin 2 (GND), pin 3 (ILIM), pin 4 (EN), and pin 5 (VIN). Pin 5 of the current limiting chip U1 is connected to the negative electrode of the first rectifier diode D1, pin 2 of the current limiting chip U1 is grounded, pin 4 of the current limiting chip U1 is connected to pin 5 of the current limiting chip U1, pin 3 of the current limiting chip U1 is grounded through a second resistor R2, pin 1 of the current limiting chip U1 is connected to the positive electrode of the farad capacitor assembly, and the negative electrode of the farad capacitor assembly is grounded;

[0060] Furthermore, in terms of circuit design, the connection line between pin 5 of the current limiting chip U1 and the first rectifier diode D1 is also grounded via the first capacitor C1.

[0061] The buck-boost circuit includes a buck-boost chip U3. The buck-boost chip U3 has 10 pins, namely pin 1 (VOUT), pin 2 (L2), pin 3 (PGND), pin 4 (L1), pin 5 (VIN), pin 6 (EN), pin 7 (PS / SYNC), pin 8 (VINA), pin 9 (GND), and pin 10 (FB). Pin 5 of the buck-boost chip U3 is connected to the positive electrode of the farad capacitor assembly, pin 4 of the buck-boost chip U3 is connected to pin 2 of the buck-boost chip U3 through the second inductor L2, pins 8, 6 and 7 of the buck-boost chip U3 are all connected to pin 5 of the buck-boost chip U3 through the sixth resistor R6, pin 9 of the buck-boost chip U3 is grounded, pin 3 of the buck-boost chip U3 is grounded, pin 10 of the buck-boost chip U3 is connected to pin 1 of the buck-boost chip U3 through the seventh resistor R7, pin 10 of the buck-boost chip U3 is also grounded through the eighth resistor R8, and pin 1 of the buck-boost chip U3 is connected to the load through the second rectifier diode D2; wherein, pin 1 of the buck-boost chip U3 is connected to the positive electrode of the second rectifier diode D2, and the negative electrode of the second rectifier diode D2 is connected to the load;

[0062] Furthermore, in circuit design, the positive electrode of the farad capacitor assembly is also grounded through a fourth resistor R4 and a fifth resistor R5 connected in series;

[0063] The connection line between the fourth resistor R4 and the fifth resistor R5 is also connected to the processor;

[0064] The connection line between the positive electrode of the farad capacitor assembly and the 5th foot of the buck-boost chip U3 is also grounded through the seventh capacitor C7;

[0065] The connection line between the 8th, 6th and 7th pins of the buck-boost chip U3 and the sixth resistor R6 is also grounded via an eighth capacitor C8;

[0066] The connection line between the pin 1 of the buck-boost chip U3 and the second rectifier diode D2 is also grounded through the fifth capacitor C5 and the sixth capacitor C6 respectively.

[0067] In the present application, the farad capacitor assembly includes a first farad capacitor C3 and a second farad capacitor C4 connected in series, the positive electrode of the first farad capacitor C3 is the positive electrode of the farad capacitor assembly, the negative electrode of the second farad capacitor C4 is the negative electrode of the farad capacitor assembly, and the first farad capacitor C3 and the second farad capacitor C4 are of the same model.

[0068] Among them, the 4th pin of the boost chip U2 is a switch pin. During the charging of the farad capacitor component, the 4th pin of the boost chip U2 is at a high level, so that the boost chip U2 works normally.

[0069] During the charging of the farad capacitor component, the processor will detect the power level of the farad capacitor component in real time. When the power level of the farad capacitor component reaches 90% of the full charge, the processor controls the 4th pin of the boost chip U2 to a low level, causing the boost chip U2 to stop working. Since the voltage of the power supply is lower than the voltage of the farad capacitor component, the farad capacitor component cannot continue to be charged.

[0070] Pin 4 of the current limiting chip U1 is a switch pin. When the power supply is connected, the current limiting chip U1 is in an open state. During the charging of the farad capacitor component, the current flowing through the current limiting chip U1 flows from the power supply to the farad capacitor component. If the boost chip U2 stops working, the current limiting chip U1 can prevent the voltage of the farad capacitor component from flowing to the power supply.

[0071] Pin 6 of the buck-boost chip U3 is a switch pin. When the load is connected, the pin 6 of the buck-boost chip U3 is at a high level, and the buck-boost chip U3 remains in an open and conductive state. If the power in the farad capacitor component cannot maintain the buck-boost chip U3, the buck-boost chip U3 will be disconnected, there will be no output voltage, and the lithium battery will power the load instead. After the buck-boost chip U3 is disconnected, it can prevent backflow.

[0072] During the charging of the farad capacitor component, the current flows in the following direction: power supply - first inductor L1 - first rectifier diode D1 - pin 5 of the current limiting chip U1 - pin 1 of the current limiting chip U1 - positive electrode of the farad capacitor component;

[0073] During the discharge of the farad capacitor component, the current flows in the following direction: the positive electrode of the farad capacitor component - pin 5 of the buck-boost chip U3 - pin 1 of the buck-boost chip U3 - the second rectifier diode D2 - the load.

[0074] The logic switch circuit includes a PMOS tube Q1, the S pole of the PMOS tube Q1 is connected to the power supply, the G pole of the PMOS tube Q1 is connected to the processor through a thirteenth resistor R13, the D pole of the PMOS tube Q1 is connected to the battery charging circuit, and the G pole of the PMOS tube Q1 is also connected to the S pole of the PMOS tube Q1 through an eleventh resistor R11, so that during the charging of the farad capacitor component of the PMOS tube Q1, the G pole of the PMOS tube Q1 is at a high level, and the PMOS tube Q1 remains in a disconnected state.

[0075] Furthermore, in circuit design, the connection line between the S pole of the PMOS tube Q1 and the power supply is also grounded through a tenth resistor R10 and a twelfth resistor R12 connected in series;

[0076] The connection circuit of the tenth resistor R10 and the twelfth resistor R12 is also connected to the processor;

[0077] The G pole of the PMOS tube Q1 is also connected to the S pole of the PMOS tube Q1 through the tenth capacitor C10;

[0078] When the power is just connected, the 4th pin of the boost chip U2 is at a high level, and the boost chip U2 is in working state by default. The 4th pin of the current limiting chip U1 is also at a high level, and the current limiting chip U1 is also in an open state by default. At the same time, the G pole of the PMOS tube Q1 is at a high level, and the PMOS tube Q1 is disconnected (or cut-off) by default. The processor detects the power of the farad capacitor component in real time. If the power of the farad capacitor component is less than 90%, the state of the 4th pin of the boost chip U2 and the G pole of the PMOS tube Q1 will not be changed, so that the power supply gives priority to charging the farad capacitor component.

[0079] When the power of the farad capacitor component reaches 90% of the full charge state, the processor controls the boost chip U2 to turn off. At this time, the voltage of the farad capacitor component is greater than the power supply voltage, and the power supply can no longer charge the farad capacitor component. At the same time, the current limiting chip U1 can prevent the voltage of the farad capacitor component from flowing back to the power supply; at the same time, the processor controls the G pole of the PMOS tube Q1 to a low level, so that the PMOS tube Q1 is in the on state, and then switches to charging the lithium battery.

[0080] The battery charging circuit includes a charging management chip U4. The charging management chip U4 has 9 pins, namely pin 1 (TEMP), pin 2 (PROG), pin 3 (GND), pin 4 (VCC), pin 5 (BAT), pin 6 (STDBY#), pin 7 (CHRG#), pin 8 (CE), and pin 9 (EP). Pin 4 of the charging management chip U4 is connected to the D pole of the PMOS tube Q1, pin 8 of the charging management chip U4 is connected to pin 4 of the charging management chip U4, pin 7 of the charging management chip U4 is suspended, pin 6 of the charging management chip U4 is grounded through the fourteenth resistor R14, pin 3 of the charging management chip U4 is grounded, pin 2 of the charging management chip U4 is grounded through the fifteenth resistor R15, pin 1 of the charging management chip U4 is connected to the lithium battery, pin 1 of the charging management chip U4 is also connected to pin 4 of the charging management chip U4 through the ninth resistor R9, and pin 1 of the charging management chip U4 is also grounded through the sixteenth resistor R16, pin 9 of the charging management chip U4 is grounded, and pin 9 of the charging management chip U4 is also connected to pin 5 of the charging management chip U4 through the eleventh capacitor C11, and pin 5 of the charging management chip U4 is also connected to the lithium battery and the output switch circuit respectively.

[0081] Furthermore, in terms of circuit design, the connection line between the 4th pin of the charging management chip U4 and the D pole of the PMOS tube Q1 is also grounded via a ninth capacitor C9.

[0082] The lithium battery has an NTC pin, which is connected to pin 1 of the charging management chip U4. The negative electrode of the lithium battery is grounded, and the positive electrode of the lithium battery is connected to pin 5 of the charging management chip U4. The positive electrode of the lithium battery is also connected to the output switch circuit.

[0083] The output switch circuit includes a switch chip U5, which has 5 pins, namely, pin 1 (VOUT), pin 2 (GND), pin 3 (nFAULT), pin 4 (EN), and pin 5 (VIN). Pin 1 of the switch chip U5 is connected to the load, pin 2 of the switch chip U5 is grounded, pin 3 of the switch chip U5 is connected to pin 5 of the switch chip U5 through the seventeenth resistor R17, pin 4 of the switch chip U5 is connected to pin 5 of the switch chip U5, and pin 5 of the switch chip U5 is respectively connected to the positive electrode of the lithium battery and pin 5 of the charging management chip U4.

[0084] Furthermore, in circuit design, the connection line between the load and the switch chip U5 is grounded via the twelfth capacitor C12.

[0085] Among them, pin 4 of the switch chip U5 is the switch pin. During the discharge of the lithium battery, pin 4 of the switch chip U5 is at a high level, so that the switch chip U5 is in an open and conductive state; if the farad capacitor component supplies power to the load, the switch chip U5 is in a closed and disconnected state, which plays a role in preventing backflow.

[0086] During the charging of the lithium battery, the current flows as follows: power supply -- PMOS tube Q1 -- pin 4 of the charging management chip U4 -- pin 5 of the charging management chip U4 -- the positive electrode of the lithium battery;

[0087] During the discharge of the lithium battery, the current flows in the following direction: the positive electrode of the lithium battery - pin 5 of the switch chip U5 - pin 1 of the switch chip U5 - load.

[0088] In this embodiment, in order to adapt to the corresponding electronic equipment, it can be set that: the voltage of the power supply is 5V, and after the boost circuit, the voltage becomes 5.4V, and the rated voltage of the farad capacitor component is also 5.4V, so that the farad capacitor component is charged with a charging voltage of 5.4V;

[0089] The buck-boost chip U3 is configured to work at an input voltage of 1.8-5.5V, and the output constant voltage after buck-boost is 5V; therefore, it can be concluded that the first voltage value is 5V; when the farad capacitor component is discharged until its voltage drops below 1.8V, the buck-boost chip U3 will stop working;

[0090] The rated voltage of the lithium battery is set to 4.2V, that is, the second voltage value is 4.2V;

[0091] The supply voltage value of the load can be configured between 3.0-5.5V, that is, the load can work normally within this voltage value range.

[0092] Of course, the above numerical settings are not limited and can be set according to actual application products and needs.

[0093] It is worth noting that for the relevant circuit chips involved in this application, turning on refers to turning on the chip enable, and turning off refers to turning off the chip enable.

[0094] The charge and discharge control circuit based on the farad capacitor and the lithium battery provided by the present invention is described below. The charge and discharge control circuit based on the farad capacitor and the lithium battery described below and the charge and discharge control method based on the farad capacitor and the lithium battery described above can be referred to each other.

[0095] On the other hand, the present invention provides a charge and discharge control circuit based on a farad capacitor and a lithium battery, comprising: a power connection terminal, a processor, a load connection terminal, a farad capacitor component and a lithium battery;

[0096] The power connection end is connected to the farad capacitor assembly through a current limiting circuit, a boost circuit is provided on the line connecting the power connection end and the current limiting circuit, and the farad capacitor assembly is connected to the load connection end through the boost-boost circuit;

[0097] The power connection terminal is also connected to the lithium battery through the logic switch circuit and the battery charging circuit in sequence, and the lithium battery is connected to the load connection terminal through the output switch circuit;

[0098] The processor is respectively connected to the power connection terminal, the boost circuit, the farad capacitor component, and the logic switch circuit.

[0099] As the names suggest, the power connection terminal is used to connect to a power source, and the load connection terminal is used to connect to a load.

[0100] Further, the power connection end is connected to the current limiting circuit through the first inductor L1 and the first rectifier diode D1 in sequence; specifically, the first inductor L1 is connected to the positive electrode of the first rectifier diode D1, and the negative electrode of the first rectifier diode D1 is connected to the current limiting circuit;

[0101] Among them, the boost circuit includes a boost chip U2, and the model of the boost chip U2 is: SGM6623YN6G / TR. The boost chip U2 has 6 pins, namely pin 1 (SW), pin 2 (GND), pin 3 (FB), pin 4 (EN), pin 5 (VS), and pin 6 (NC). Pin 1 of the boost chip U2 is connected to the positive electrode of the first rectifier diode D1, pin 2 of the boost chip U2 is grounded, pin 3 of the boost chip U2 is grounded through the third resistor R3, pin 4 of the boost chip U2 is connected to the controller, and pin 4 of the boost chip U2 is also connected to the power connection end through the eighteenth resistor R18, pin 5 of the boost chip U2 is connected to the negative electrode of the first rectifier diode D1, and pin 5 of the boost chip U2 is also connected to pin 3 of the boost chip U2 through the first resistor R1, and pin 6 of the boost chip U2 is suspended;

[0102] Furthermore, in terms of circuit design, pin 4 of the boost chip U2 is also grounded via a second capacitor C2.

[0103] The current limiting circuit includes a current limiting chip U1, and the model of the current limiting chip U1 is: SGM2590. The current limiting chip U1 has 5 pins, namely pin 1 (VOUT), pin 2 (GND), pin 3 (ILIM), pin 4 (EN), and pin 5 (VIN). Pin 5 of the current limiting chip U1 is connected to the negative electrode of the first rectifier diode D1, pin 2 of the current limiting chip U1 is grounded, pin 4 of the current limiting chip U1 is connected to pin 5 of the current limiting chip U1, pin 3 of the current limiting chip U1 is grounded through the second resistor R2, pin 1 of the current limiting chip U1 is connected to the positive electrode of the farad capacitor assembly, and the negative electrode of the farad capacitor assembly is grounded;

[0104] Furthermore, in terms of circuit design, the connection line between pin 5 of the current limiting chip U1 and the first rectifier diode D1 is also grounded via the first capacitor C1.

[0105] The buck-boost circuit includes a buck-boost chip U3, and the model of the buck-boost chip U3 is: TPS63000. The buck-boost chip U3 has 10 pins, namely pin 1 (VOUT), pin 2 (L2), pin 3 (PGND), pin 4 (L1), pin 5 (VIN), pin 6 (EN), pin 7 (PS / SYNC), pin 8 (VINA), pin 9 (GND), and pin 10 (FB). Pin 5 of the buck-boost chip U3 is connected to the positive electrode of the farad capacitor component, pin 4 of the buck-boost chip U3 is connected to pin 2 of the buck-boost chip U3 through the second inductor L2, pins 8, 6 and 7 of the buck-boost chip U3 are all connected to pin 5 of the buck-boost chip U3 through the sixth resistor R6, pin 9 of the buck-boost chip U3 is grounded, pin 3 of the buck-boost chip U3 is grounded, pin 10 of the buck-boost chip U3 is connected to pin 1 of the buck-boost chip U3 through the seventh resistor R7, pin 10 of the buck-boost chip U3 is also grounded through the eighth resistor R8, and pin 1 of the buck-boost chip U3 is connected to the load connection end through the second rectifier diode D2; wherein, pin 1 of the buck-boost chip U3 is connected to the positive electrode of the second rectifier diode D2, and the negative electrode of the second rectifier diode D2 is connected to the load connection end;

[0106] Furthermore, in circuit design, the positive electrode of the farad capacitor assembly is also grounded through a fourth resistor R4 and a fifth resistor R5 connected in series;

[0107] The connection line between the fourth resistor R4 and the fifth resistor R5 is also connected to the processor;

[0108] The connection line between the positive electrode of the farad capacitor assembly and the 5th foot of the buck-boost chip U3 is also grounded through the seventh capacitor C7;

[0109] The connection line between the 8th, 6th and 7th pins of the buck-boost chip U3 and the sixth resistor R6 is also grounded via an eighth capacitor C8;

[0110] The connection line between the pin 1 of the buck-boost chip U3 and the second rectifier diode D2 is also grounded through the fifth capacitor C5 and the sixth capacitor C6 respectively.

[0111] In the present application, the farad capacitor assembly includes a first farad capacitor C3 and a second farad capacitor C4 connected in series, the positive electrode of the first farad capacitor C3 is the positive electrode of the farad capacitor assembly, the negative electrode of the second farad capacitor C4 is the negative electrode of the farad capacitor assembly, and the first farad capacitor C3 and the second farad capacitor C4 are of the same model.

[0112] The logic switch circuit includes a PMOS tube Q1, the S pole of the PMOS tube Q1 is connected to the power connection end, the G pole of the PMOS tube Q1 is connected to the processor through a thirteenth resistor R13, the D pole of the PMOS tube Q1 is connected to the battery charging circuit, and the G pole of the PMOS tube Q1 is also connected to the S pole of the PMOS tube Q1 through an eleventh resistor R11.

[0113] Furthermore, in circuit design, the connection line between the S pole of the PMOS tube Q1 and the power connection terminal is also grounded through a tenth resistor R10 and a twelfth resistor R12 connected in series;

[0114] The connection circuit of the tenth resistor R10 and the twelfth resistor R12 is also connected to the processor;

[0115] The G pole of the PMOS tube Q1 is also connected to the S pole of the PMOS tube Q1 through a tenth capacitor C10.

[0116] The battery charging circuit includes a charging management chip U4, and the model of the charging management chip U4 is: TP4056. The charging management chip U4 has 9 pins, namely pin 1 (TEMP), pin 2 (PROG), pin 3 (GND), pin 4 (VCC), pin 5 (BAT), pin 6 (STDBY#), pin 7 (CHRG#), pin 8 (CE), and pin 9 (EP). Pin 4 of the charging management chip U4 is connected to the D pole of the PMOS tube Q1, pin 8 of the charging management chip U4 is connected to pin 4 of the charging management chip U4, pin 7 of the charging management chip U4 is suspended, pin 6 of the charging management chip U4 is grounded through the fourteenth resistor R14, pin 3 of the charging management chip U4 is grounded, pin 2 of the charging management chip U4 is grounded through the fifteenth resistor R15, pin 1 of the charging management chip U4 is connected to the lithium battery, pin 1 of the charging management chip U4 is also connected to pin 4 of the charging management chip U4 through the ninth resistor R9, and pin 1 of the charging management chip U4 is also grounded through the sixteenth resistor R16, pin 9 of the charging management chip U4 is grounded, and pin 9 of the charging management chip U4 is also connected to pin 5 of the charging management chip U4 through the eleventh capacitor C11, and pin 5 of the charging management chip U4 is also connected to the lithium battery and the output switch circuit respectively.

[0117] Furthermore, in terms of circuit design, the connection line between the 4th pin of the charging management chip U4 and the D pole of the PMOS tube Q1 is also grounded via a ninth capacitor C9.

[0118] The lithium battery has an NTC pin, which is connected to pin 1 of the charging management chip U4. The negative electrode of the lithium battery is grounded, and the positive electrode of the lithium battery is connected to pin 5 of the charging management chip U4. The positive electrode of the lithium battery is also connected to the output switch circuit.

[0119] The output switch circuit includes a switch chip U5, and the model of the switch chip U5 is: SGM2594CXN5. The switch chip U5 has 5 pins, namely pin 1 (VOUT), pin 2 (GND), pin 3 (nFAULT), pin 4 (EN), and pin 5 (VIN). Pin 1 of the switch chip U5 is connected to the load connection terminal, pin 2 of the switch chip U5 is grounded, pin 3 of the switch chip U5 is connected to pin 5 of the switch chip U5 through the seventeenth resistor R17, pin 4 of the switch chip U5 is connected to pin 5 of the switch chip U5, and pin 5 of the switch chip U5 is respectively connected to the positive electrode of the lithium battery and pin 5 of the charging management chip U4.

[0120] Furthermore, in circuit design, the connection line between the load connection terminal and the switch chip U5 is grounded via a twelfth capacitor C12.

[0121] The charge and discharge control circuit based on a farad capacitor and a lithium battery of the present invention is used to execute the charge and discharge control method based on a farad capacitor and a lithium battery described above, so the operation logic of the circuit will not be described in detail here.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A charge and discharge control method based on a farad capacitor and a lithium battery, characterized in that: include: When the power supply is connected, the logic switch circuit is disconnected, the current limiting circuit is turned on, and the power supply is boosted by the boost circuit and then charges the farad capacitor component through the current limiting circuit; When the power of the farad capacitor component reaches a preset value, the processor controls the boost circuit to stop working, and controls the logic switch circuit to be turned on, and the power supply charges the lithium battery through the logic switch circuit and the battery charging circuit; When the load is connected, if the voltage of the farad capacitor component is within the voltage input value range required for the buck-boost circuit to work, the buck-boost circuit is turned on, and the farad capacitor component supplies power to the load at the first voltage value after passing through the buck-boost circuit, and at the same time, the output switch circuit is disconnected; When the farad capacitor component is discharged to the point where it cannot supply power to the load at the first voltage value, the buck-boost circuit is disconnected, and the output switch circuit is turned on, and the lithium battery supplies power to the load at the second voltage value through the output switch circuit; Wherein, the power supply is connected to the current limiting circuit through the first inductor and the first rectifier diode in sequence; The boost circuit includes a boost chip, which has 6 pins, wherein pin 1 of the boost chip is connected to the positive electrode of the first rectifier diode, pin 2 of the boost chip is grounded, pin 3 of the boost chip is grounded through a third resistor, pin 4 of the boost chip is connected to the controller, pin 4 of the boost chip is also connected to the power supply through an eighteenth resistor, pin 5 of the boost chip is connected to the negative electrode of the first rectifier diode, pin 5 of the boost chip is also connected to pin 3 of the boost chip through the first resistor, and pin 6 of the boost chip is suspended; The current limiting circuit includes a current limiting chip, which has 5 pins. Pin 5 of the current limiting chip is connected to the negative electrode of the first rectifier diode, pin 2 of the current limiting chip is grounded, pin 4 of the current limiting chip is connected to pin 5 of the current limiting chip, pin 3 of the current limiting chip is grounded through a second resistor, pin 1 of the current limiting chip is connected to the positive electrode of the farad capacitor assembly, and the negative electrode of the farad capacitor assembly is grounded.

2. The charge and discharge control method based on farad capacitor and lithium battery according to claim 1, characterized in that: The buck-boost circuit includes a buck-boost chip, which has 10 pins. Pin 5 of the buck-boost chip is connected to the positive pole of the farad capacitor assembly, pin 4 of the buck-boost chip is connected to pin 2 of the buck-boost chip through a second inductor, pins 8, 6 and 7 of the buck-boost chip are all connected to pin 5 of the buck-boost chip through a sixth resistor, pin 9 of the buck-boost chip is grounded, pin 3 of the buck-boost chip is grounded, pin 10 of the buck-boost chip is connected to pin 1 of the buck-boost chip through a seventh resistor, pin 10 of the buck-boost chip is also grounded through an eighth resistor, and pin 1 of the buck-boost chip is connected to the load through a second rectifier diode.

3. The charge and discharge control method based on farad capacitor and lithium battery according to claim 1, characterized in that: The farad capacitor assembly includes a first farad capacitor and a second farad capacitor connected in series, the positive electrode of the first farad capacitor is the positive electrode of the farad capacitor assembly, and the negative electrode of the second farad capacitor is the negative electrode of the farad capacitor assembly.

4. The charge and discharge control method based on farad capacitor and lithium battery according to claim 1, characterized in that: Pin 4 of the boost chip is a switch pin. During the charging of the farad capacitor component, pin 4 of the boost chip is at a high level, allowing the boost chip to work normally.

5. The charge and discharge control method based on farad capacitor and lithium battery according to claim 4, characterized in that: During the charging of the farad capacitor component, the processor will detect the power of the farad capacitor component in real time. When the power of the farad capacitor component reaches 90% of the full charge state, the processor controls the 4th pin of the boost chip to a low level, so that the boost chip stops working.

6. The charge and discharge control method based on farad capacitor and lithium battery according to claim 5, characterized in that: Pin 4 of the current limiting chip is the switch pin. When the power is connected, the current limiting chip is in the open state.

7. The charge and discharge control method based on farad capacitor and lithium battery according to claim 2, characterized in that: Pin 6 of the buck-boost chip is the switch pin. When the load is connected, pin 6 of the buck-boost chip is at a high level, and the buck-boost chip remains in an open and conductive state.

8. The charge and discharge control method based on farad capacitor and lithium battery according to claim 1, characterized in that: The logic switch circuit includes a PMOS tube, the S pole of the PMOS tube is connected to the power supply, the G pole of the PMOS tube is connected to the processor through a thirteenth resistor, the D pole of the PMOS tube is connected to the battery charging circuit, and the G pole of the PMOS tube is also connected to the S pole of the PMOS tube through an eleventh resistor, so that during the charging of the farad capacitor component, the G pole of the PMOS tube is at a high level and the PMOS tube remains in a disconnected state.

9. The charge and discharge control method based on farad capacitor and lithium battery according to claim 8, characterized in that: The processor controls the G pole of the PMOS tube to a low level, so that the PMOS tube is in a conducting state.

10. The charge and discharge control method based on farad capacitor and lithium battery according to claim 8, characterized in that: The battery charging circuit includes a charging management chip, which has 9 pins. Pin 4 of the charging management chip is connected to the D pole of the PMOS tube, pin 8 of the charging management chip is connected to pin 4 of the charging management chip, pin 7 of the charging management chip is suspended, pin 6 of the charging management chip is grounded through a fourteenth resistor, pin 3 of the charging management chip is grounded, pin 2 of the charging management chip is grounded through a fifteenth resistor, pin 1 of the charging management chip is connected to a lithium battery, pin 1 of the charging management chip is also connected to pin 4 of the charging management chip through a ninth resistor, and pin 1 of the charging management chip is also grounded through a sixteenth resistor, pin 9 of the charging management chip is grounded, and pin 9 of the charging management chip is also connected to pin 5 of the charging management chip through an eleventh capacitor, and pin 5 of the charging management chip is also connected to a lithium battery and an output switch circuit, respectively.

11. The charge and discharge control method based on farad capacitor and lithium battery according to claim 10, characterized in that: The lithium battery has an NTC pin, which is connected to pin 1 of the charging management chip. The negative electrode of the lithium battery is grounded, the positive electrode of the battery is connected to pin 5 of the charging management chip, and the positive electrode of the battery is also connected to the output switch circuit.

12. The charge and discharge control method based on farad capacitor and lithium battery according to claim 11, characterized in that: The output switch circuit includes a switch chip, which has 5 pins. Pin 1 of the switch chip is connected to the load, pin 2 of the switch chip is grounded, pin 3 of the switch chip is connected to pin 5 of the switch chip through a seventeenth resistor, pin 4 of the switch chip is connected to pin 5 of the switch chip, and pin 5 of the switch chip is respectively connected to the positive pole of the lithium battery and pin 5 of the charging management chip.

13. The charge and discharge control method based on farad capacitor and lithium battery according to claim 12, characterized in that: Pin 4 of the switch chip is the switch pin. During the discharge of the lithium battery, pin 4 of the switch chip is at a high level, so that the switch chip is in an open and conductive state; if the farad capacitor component supplies power to the load, the switch chip is in a closed and disconnected state.

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