CN107979123B - A power supply adaptive lithium battery charging management circuit - Google Patents

Abstract

The invention discloses a power supply self-adaptive lithium battery charging management circuit which comprises a reference voltage circuit, a constant current charging circuit, a battery voltage sampling network, a charging termination circuit, a power supply voltage sampling network, a power supply self-adaptive charging control circuit, a trickle charging circuit, a constant voltage charging circuit, a constant temperature charging circuit and four paths of controlled switches. The invention can automatically adapt and match the output capacity of the power supply, and when the output capacity of the power supply is strong, the charging circuit works in a constant-current charging mode; when the power output capability is weak, the battery is charged with the current supplied by the power supply. And aiming at the characteristics of the lithium battery, the invention provides three-section type charging management which is used for charging the lithium battery, namely trickle charging, constant-current charging, constant-voltage charging management and constant-temperature charging management with overheat protection, so that the energy provided by a power supply can be effectively utilized, and the invention is particularly suitable for the application of power supply equipment with unstable power supply capacity like a solar battery to charge the lithium battery.

Description

A power supply adaptive lithium battery charging management circuit

Technical field

The invention belongs to the field of electronic technology and relates to power management technology, especially solar powered lithium battery charging management technology.

Background technique

With the development of new energy technology, solar cells are becoming more and more popular as a power source. Solar power generation, solar street lights, portable charging equipment, etc. all use solar cells as power source. However, solar cells will be affected by changes in seasons, weather, and day and night, making their power generation output current unstable. When there is sufficient sunlight, the output current of solar cells is large. When there is insufficient sunlight, the output current of solar cells is small. At night, solar cells are almost There is no current output. Therefore, solar cells cannot be used as a power supply alone to power equipment. They need to be used together with rechargeable batteries. The rechargeable batteries power the equipment, and the solar cells serve as power supplementary devices to charge the charging current.

Rechargeable batteries are generally nickel metal hydride batteries, nickel cadmium batteries, lithium batteries, etc., especially lithium batteries, which have the largest specific capacity and are currently widely used in portable products. However, due to its particularly active chemical activity, lithium batteries have very high requirements for charging and discharging voltage, current and environmental conditions, otherwise they may easily cause explosions, fires and other dangers. Therefore, lithium batteries require specialized charge and discharge management circuits to control their charge and discharge to prevent damage and danger to the battery. Traditional charging management circuits generally use constant current and constant voltage charging methods to limit the maximum charging current of the battery to ensure the safety of charging. However, there is a problem with this charging method. When the power supply energy is insufficient, that is, when the power supply output current is much less than the designed charging current, it is equivalent to adding a heavy load to the power supply, and the power supply will be pulled down, causing the power supply to be lower than the normal charging management circuit. voltage range, so that the purpose of charging the battery cannot be achieved, or there will be a cycle of repeated charging-power-off-charging. In this case, the charging efficiency will be greatly reduced, and the life of the lithium battery is related to the number of charges. Charging methods also affect the service life of lithium batteries. When solar cells are used as power sources, there will be insufficient energy in the power supply.

Due to the instability of the output current of the solar cell, the current provided to the lithium battery is different at different times. This will cause the normal constant current and constant voltage charging management circuit to work abnormally. When the output current of the solar cell reaches the constant current charging When the current capacity of the circuit is high, it can be charged; when the solar cell is far below the current capacity of the constant current charging circuit, charging will be turned off and the rechargeable battery cannot be charged.

In order to maximize the use of the power generated by solar cells, especially when the sunlight is insufficient and the output current of the solar cell is small, the power generated by the solar cell can also be effectively collected. This requires the charge management circuit to adapt to the power output current. When the power output current When the current is greater than the constant current charging current, the lithium battery is charged in constant current mode; when the power supply output current is less than the constant current charging current, the lithium battery is charged with the power supply output current.

Contents of the invention

The purpose of the present invention is to provide a power supply adaptive lithium battery charging management circuit that can automatically adapt and match the output capability of the power supply. When the power supply output capability is strong, the current capability that the power supply can provide is greater than the set constant current charging current, and the charging The circuit works in a constant current charging mode; when the power supply output capability is weak, the current capacity that the power supply can provide is less than the set constant current charging current, and the current provided by the power supply is used for charging, and at the same time it can provide a three-stage charging method for lithium batteries. management, namely trickle charging, constant current charging and constant voltage charging management and constant temperature charging management with overheating protection, making the present invention suitable for solar powered lithium battery charging management applications.

In order to achieve the above objectives, the solution of the present invention is:

A power supply adaptive lithium battery charging management circuit, including a reference voltage circuit, a constant current charging circuit, a battery voltage sampling network, a charging termination circuit, a power supply voltage sampling network, a power supply adaptive charging control circuit, a trickle charging circuit, and a constant voltage charging circuit, constant temperature charging circuit and first controlled switch, second controlled switch, third controlled switch and fourth controlled switch;

The reference voltage circuit outputs a reference voltage for voltage reference by other circuits; the first input end of the constant current charging circuit is connected to the first controlled switch, the third controlled switch, and the fourth controlled switch. The second end of the switch is connected, the second input end of the constant current charging circuit is connected to the second end of the second controlled switch, and the third input end of the constant current charging circuit is connected to the reference voltage output end. connected, the fourth input terminal of the constant current charging circuit is connected to the output terminal of the charging termination circuit, the first output terminal of the constant current charging circuit is connected to the first input terminal of the battery voltage sampling network, and Connected to the positive electrode of the external lithium battery, the second output terminal of the constant current charging circuit is connected to the second input terminal of the battery voltage sampling network and connected to the negative electrode of the external lithium battery, and the third output terminal of the constant current charging circuit is connected to the positive electrode of the external lithium battery. The output terminal is connected to the fourth input terminal of the charge termination circuit; the first output terminal of the battery voltage sampling network is connected to the first input terminal of the charge termination circuit, and the second output terminal of the battery voltage sampling network Connected to the first input terminal of the trickle charging circuit, the third output terminal of the battery voltage sampling network is connected to the first input terminal of the constant voltage charging circuit; the second input terminal of the charge termination circuit is connected to The output terminal of the reference voltage circuit is connected, the third input terminal of the charge termination circuit is connected to the first output terminal of the power supply adaptive charging control circuit; the first input terminal of the power supply adaptive charging control circuit is connected to The output end of the power supply voltage sampling network is connected, the second input end of the power supply adaptive charging control circuit is connected to the output end of the reference voltage circuit, the second output end of the power supply adaptive charging control circuit is connected to the The first end of the first controlled switch is connected; the second input end of the trickle charging circuit is connected to the output end of the reference voltage circuit, and the first output end of the trickle charging circuit is connected to the second The first end of the controlled switch is connected, the second output end of the trickle charging is connected to the fifth input end of the charging termination, and the second input end of the constant voltage charging circuit is connected to the output of the reference voltage circuit. terminals are connected, the output terminal of the constant voltage charging circuit is connected to the first terminal of the third controlled switch; the input terminal of the constant temperature charging circuit is connected to the output terminal of the reference voltage circuit, the constant temperature charging circuit The output terminal is connected to the first terminal of the fourth controlled switch.

The reference voltage output by the reference voltage circuit can be one channel or more than one channel, and each output voltage value is different, that is, a constant current charging circuit, a charging termination circuit, a power supply adaptive charging control circuit, a trickle charging circuit, and a constant voltage charging The reference voltage connected to the circuit and the constant current charging circuit can be the same voltage value, or it can be not all the same voltage value, or all different voltage values. When they are different voltage values, the difference in the reference voltage circuit can be used. output is obtained.

In the constant current charging stage of the lithium battery, the constant current charging circuit completes the constant current charging control of the lithium battery; in other stages, it is connected with the charging termination circuit, the power supply adaptive charging control circuit, the trickle charging circuit, and the constant voltage. The charging circuit or constant temperature charging circuit jointly completes the trickle charging, constant voltage charging, constant temperature charging, power adaptive charging or charging termination of the lithium battery; the constant current charging state indicates that when the lithium battery voltage is in a certain voltage range, the lithium battery will A constant current charging method.

The battery voltage sampling network is used to detect the voltage value at both ends of the lithium battery, and feed back the lithium battery voltage value or the divided voltage value of the lithium battery voltage to the charge termination circuit, the trickle charging circuit and the constant voltage charging circuit.

The charge termination circuit completes the charge termination control of the lithium battery by sampling the size of the charging current or by comparing the voltage fed back by the battery voltage sampling network with the size of the reference voltage. When the charging current is less than a certain value, or the lithium battery voltage When it is higher than a certain value, the charge termination circuit ends charging the lithium battery by controlling the constant current charging circuit; when the power supply adaptive charging control circuit controls the charging circuit to work, the charge termination circuit terminates charging through voltage sampling; When the power supply adaptive charging control circuit does not control the operation of the charging circuit, the charging termination circuit terminates charging through current sampling.

The power supply voltage sampling network is used to detect the voltage value at both ends of the power supply, and feed back the power supply voltage value or the divided voltage value of the power supply voltage to the power supply adaptive charging control circuit.

The power supply adaptive charging control circuit compares the voltage value fed back by the power supply voltage sampling network with the size of the reference voltage. When the power supply voltage is higher than a certain voltage value, it controls the first controlled switch to close, so that the constant current The charging circuit is not controlled by the power supply adaptive charging control circuit; when the power supply voltage is lower than a certain voltage value, the first controlled switch is controlled to be turned on, so that the power supply adaptive charging control circuit controls the constant current charging circuit It is in the power supply adaptive charging state and is no longer in the constant current charging state; the power supply adaptive charging state is when the current provided by the power supply is less than the constant current charging current, the charging current is automatically adjusted according to the current provided by the power supply, so that the charging current The size adapts to the current provided by the power supply.

The trickle charging circuit compares the voltage fed back by the battery voltage sampling network with the reference voltage. When the lithium battery voltage is higher than a certain voltage value, the trickle charging circuit controls the second controlled switch to close. , the constant current charging circuit is not controlled by the trickle charging circuit; when the lithium battery voltage is lower than a certain voltage value, the second controlled switch is controlled to open, so that the trickle charging circuit controls the constant current charging The circuit is in the trickle charging state and is no longer in the constant current charging state; the trickle charging state means that the charging current is charged at a constant current value lower than the constant current charging current; in the trickle charging state, the charging termination circuit Controlled by the trickle charging circuit has no effect.

The constant voltage charging circuit compares the voltage fed back by the battery voltage sampling network with the reference voltage. When the lithium battery voltage is lower than a certain voltage value, the constant voltage charging circuit controls the third controlled switch to close. , the constant current charging circuit is not controlled by the constant voltage charging circuit; when the lithium battery voltage is higher than a certain voltage value, the constant voltage charging circuit controls the third controlled switch to open, so that the constant The voltage charging circuit controls the constant current charging circuit to be in a constant voltage charging state and is no longer in a constant current charging state; the constant voltage charging state means that after the lithium battery voltage is higher than a certain voltage value, the charging voltage slowly increases or remains unchanged, so that A charging method in which the charging current gradually decreases from the original constant current charging current.

The constant temperature charging circuit determines the temperature by comparing the voltage generated by its internal temperature sensor with the reference voltage. When the temperature sensed by the temperature sensor is lower than a certain temperature value, the constant temperature charging circuit controls the fourth controlled The switch is closed, and the constant current charging circuit is not controlled by the constant temperature charging circuit; when the temperature sensed by the temperature sensor is higher than a certain temperature value, the constant temperature charging circuit controls the fourth controlled switch to open, causing the The constant temperature charging circuit controls the constant current charging circuit to be in a constant temperature charging state and is no longer in a constant current charging state; the constant temperature charging state means that after the temperature sensor sensing temperature is higher than a certain temperature value, the charging temperature remains constant, so that the charging current changes from It turns out that constant current charging is a charging method in which the current gradually decreases.

Due to the above solution, the beneficial effects of the present invention are: the power supply adaptive lithium battery charging management circuit of the present invention can automatically adapt and match the output capability of the power supply. When the power supply output capability is strong, the current capability that the power supply can provide is greater than the set constant When the power supply output capability is weak and the current capability provided by the power supply is less than the set constant current charging current, the charging circuit is charged with the current provided by the power supply. In view of the characteristics of lithium batteries, the present invention provides three-stage charging management that is suitable for charging lithium batteries, namely trickle charging, constant current charging, constant voltage charging management and constant temperature charging management with overheating protection, so that the power supply can be effectively utilized. The energy is particularly suitable for charging lithium batteries for power supply equipment with unstable power supply capabilities like solar cells.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a power supply adaptive lithium battery charging management circuit of the present invention.

FIG. 2 is a schematic circuit diagram of a specific embodiment of FIG. 1 .

Figure 3 is a circuit schematic diagram of a specific embodiment of the reference voltage circuit.

In the drawings: 101. Reference voltage circuit; 102. Constant current charging circuit; 103. Battery voltage sampling network; 104. Charging termination circuit; 105. Power supply voltage sampling network; 106. Power supply adaptive charging control circuit; 107. Controlled Switch S1; 108, trickle charging circuit; 109, controlled switch S2; 110, constant voltage charging circuit; 111, controlled switch S3; 112, constant temperature charging circuit; 113, controlled switch S4.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The present invention proposes a power supply adaptive lithium battery charging management circuit. Figure 1 is a schematic structural diagram of the circuit.

As shown in Figure 1, the power supply adaptive lithium battery charging management circuit includes: reference voltage circuit 101, constant current charging circuit 102, battery voltage sampling network 103, charge termination circuit 104, power supply voltage sampling network 105, power supply adaptive charging control Circuit 106, controlled switch S1 107, trickle charging circuit 108, controlled switch S2 109, constant voltage charging circuit 110, controlled switch S3 111, constant temperature charging circuit 112, controlled switch S4 113.

The power supply adaptive lithium battery charging management circuit of the present invention mainly completes the charging management function of the lithium battery. Since the chemical characteristics of lithium batteries are very active, charging them requires voltage and current control to ensure their safety. General charging management requires a three-stage charging management part, namely trickle charging, constant current charging and constant voltage charging. When the lithium battery voltage is very low, a small current trickle charging method is used to charge the lithium battery. For example, generally when the lithium battery voltage is below 2.8V, trickle charging is used; when the lithium battery voltage is higher than the trickle charging voltage and lower than the saturation voltage , using a high current constant current charging method to ensure fast charging of the lithium battery; when the voltage of the lithium battery is close to saturation, the actual power of the lithium battery may not be fully charged due to the high current charging method using constant current, so at this time The constant voltage charging method is used, that is, the battery voltage remains basically unchanged and the charging current is gradually reduced, so as to fully charge the lithium battery. Since charging a lithium battery with a high current may cause the circuit temperature to be too high, a constant current charging method is added to ensure that the circuit temperature does not become too high and the circuit can continuously charge the lithium battery. When solar cells are used for power supply, due to the unstable output current capability of the solar cells, when there is insufficient sunlight, the output current of the solar cells is less than the constant current charging current. The power supply adaptive charging control method is used to adapt the rechargeable battery to the current output by the solar cells. size, so the power generated by solar cells can be efficiently utilized.

For the specific implementation of this circuit, refer to the circuit schematic diagram of the embodiment in Figure 2 .

The reference voltage circuit 101 is generally a bandgap reference circuit, used to generate one or more reference voltages as a voltage reference for other circuits. This reference voltage is generally not affected by external environments such as external power supply and temperature. The specific implementation of the reference voltage circuit refers to the circuit schematic diagram of FIG. 3 .

The constant current charging circuit 102 is the main circuit for charging the lithium battery. When the constant current charging circuit 102 is not controlled by other charging methods, the circuit enters the constant current charging control mode. At this time, the circuit's charging current for the lithium battery is maximum.

When the battery voltage is too low, such as lower than 2.8V, the battery is in a trickle charging state. At this time, the trickle charging circuit 108 controls the controlled switch S2 109 to open, and the trickle charging circuit 108 controls the constant current charging circuit 102 to enter the trickle charging state. In charging mode, the charging current at this time drops to the trickle charging current. When the lithium battery voltage is greater than the trickle charging voltage, the trickle charging circuit 108 controls the controlled switch S2 109 to close. At this time, the trickle charging circuit 108 does not act on the constant current charging circuit 102. If no other circuit acts on the constant current charging Circuit 102 is charged in a constant current mode at this time.

When the power supply adaptive charging control does not work and the constant current charging circuit 102 does not work, when the lithium battery voltage is close to the saturation voltage, such as 4.2V, the constant voltage charging circuit 110 controls the controlled switch S3 111 to open, and the constant voltage charging circuit 110 controls the constant current charging circuit 102 to enter the constant voltage charging mode. At this time, the charging voltage is kept approximately constant and the charging current is reduced until the charging termination circuit determines that the charging current is less than a certain current value. The charging termination circuit 104 controls the constant current charging circuit 102 End charging and charging is completed.

When the circuit temperature is too high during charging, the constant temperature charging circuit 112 controls the controlled switch S4 113 to open, and the constant temperature charging circuit 112 controls the constant current charging circuit 102 to enter the constant temperature charging mode. At this time, the circuit temperature is kept approximately constant, and the charging current is reduced. decreases, the circuit temperature will decrease. If the external environment does not change, the temperature balance will be reached at this time and constant temperature charging will be maintained. If the external environment changes, such as increasing heat dissipation, causing the circuit temperature to decrease, the constant temperature charging circuit 112 turns off the controlled switch S4 113, and the constant temperature charging circuit 112 does not act on the constant current charging circuit 102, and the constant current charging mode is restored.

When the power supply output current capacity is limited, the power supply output current is less than the constant current charging current. When charging in constant current mode, the power supply voltage will be pulled down. When the circuit determines this situation, it will activate the power supply adaptive charging control. , the power supply adaptive charging control circuit 106 controls the controlled switch S1 107 to open, so that the power supply adaptive charging control circuit 106 controls the constant current charging circuit 102 to work in the power supply adaptive charging mode, reducing the charging current to the current capacity that the power supply can provide. , at this time, the charge termination circuit 104 is controlled by the power supply adaptive charging, and uses the method of detecting the lithium battery voltage instead of detecting the charging current to terminate charging, for example, detecting when the lithium battery voltage is greater than 4.2V to terminate charging.

The battery voltage sampling network 103 is used to detect the voltage value at both ends of the lithium battery, and feed back the lithium battery voltage value or the divided voltage value of the lithium battery voltage to the charge termination circuit 104, the trickle charging circuit 108 and the constant voltage charging circuit 110.

The power supply voltage sampling network 105 is used to detect the voltage value across the power supply, and feed back the power supply voltage value or the divided voltage value of the power supply voltage to the power supply adaptive charging control circuit 106 .

The controlled switches S1, S2, S3 and S4 are either diode switches, transistor switches, or field effect transistor (MOS) switches.

The details of several key circuits in Figure 2 are as follows:

The power supply voltage sampling network 105 includes resistors R1 and R2; the first ends of the resistors R1 and R2 are connected to each other and connected to the input end of the power supply adaptive charging control circuit 106; the second end of the resistor R1 is connected to the power supply voltage; the second end of the resistor R2 is connected to The second end is externally connected to ground.

The power supply adaptive charging control circuit 106 includes an operational amplifier A1; the first input terminal of the operational amplifier A1 is externally connected to the output terminal of the power supply voltage sampling network 105, and the second input terminal of the operational amplifier A1 is externally connected to the reference voltage; the output terminal of the operational amplifier A1 is connected to The input terminals of the controlled switch S1 107 are connected.

The constant current charging circuit 102 includes MOS tubes M1, M2, M3, operational amplifiers A2, A3 and resistors R3 and R4; the first ends of MOS tubes M1 and M2 are connected and connected to the external power supply voltage; the second ends of MOS tubes M1 and M2 terminals are connected to each other and to the output terminal of the operational amplifier A2. The third terminal of the MOS tube M1 is connected to the first terminal of the MOS tube M3 and the first input terminal of the operational amplifier A3. The third terminal of the MOS tube M2 is connected to the operational amplifier A2. The second input terminal of the amplifier A3 is connected to the BAT output terminal and connected to the positive electrode of the lithium battery; the second terminal of the MOS tube M3 is connected to the output terminal of the operational amplifier A3, and the third terminal of the MOS tube M3 is connected to the resistor. The first ends of R3 and R4 are connected; the second end of the resistor R3 is connected to the external ground; the second end of the resistor R4 is connected to the first input end of the operational amplifier A2 and to the output end of the controlled switch S1 107; operation The second input terminal of amplifier A2 is externally connected to the reference voltage.

The power supply adaptive lithium battery charging management circuit of the present invention solves the problem that the traditional lithium battery charging control circuit cannot charge the lithium battery when the power output capacity is insufficient, or the charging is repeatedly on and off. It can be applied to solar battery-powered devices. In terms of equipment, it improves the efficiency of solar cell applications and is highly practical.

The above description of the embodiments is to facilitate those of ordinary skill in the technical field to understand and apply this patent. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without inventive efforts. Therefore, the present invention is not limited to the embodiments here. Based on the disclosure of the present invention, improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims (10)

1. A power supply adaptive lithium battery charging management circuit, characterized by: including a reference voltage circuit, a constant current charging circuit, a battery voltage sampling network, a charge termination circuit, a power supply voltage sampling network, a power supply adaptive charging control circuit, and a trickle current Charging circuit, constant voltage charging circuit, constant temperature charging circuit and first controlled switch, second controlled switch, third controlled switch and fourth controlled switch; The reference voltage circuit outputs a reference voltage for voltage reference by other circuits; the first input end of the constant current charging circuit is connected to the first controlled switch, the third controlled switch, and the fourth controlled switch. The second end of the switch is connected, the second input end of the constant current charging circuit is connected to the second end of the second controlled switch, and the third input end of the constant current charging circuit is connected to the reference voltage output end. connected, the fourth input terminal of the constant current charging circuit is connected to the output terminal of the charging termination circuit, the first output terminal of the constant current charging circuit is connected to the first input terminal of the battery voltage sampling network, and Connected to the positive electrode of the external lithium battery, the second output terminal of the constant current charging circuit is connected to the second input terminal of the battery voltage sampling network and connected to the negative electrode of the external lithium battery, and the third output terminal of the constant current charging circuit is connected to the positive electrode of the external lithium battery. The output terminal is connected to the fourth input terminal of the charge termination circuit; the first output terminal of the battery voltage sampling network is connected to the first input terminal of the charge termination circuit, and the second output terminal of the battery voltage sampling network Connected to the first input terminal of the trickle charging circuit, the third output terminal of the battery voltage sampling network is connected to the first input terminal of the constant voltage charging circuit; the second input terminal of the charging termination circuit is connected to The output terminal of the reference voltage circuit is connected, the third input terminal of the charge termination circuit is connected to the first output terminal of the power supply adaptive charging control circuit; the first input terminal of the power supply adaptive charging control circuit is connected to The output end of the power supply voltage sampling network is connected, the second input end of the power supply adaptive charging control circuit is connected to the output end of the reference voltage circuit, the second output end of the power supply adaptive charging control circuit is connected to the The first end of the first controlled switch is connected; the second input end of the trickle charging circuit is connected to the output end of the reference voltage circuit, and the first output end of the trickle charging circuit is connected to the second The first end of the controlled switch is connected, the second output end of the trickle charging is connected to the fifth input end of the charging termination, and the second input end of the constant voltage charging circuit is connected to the output of the reference voltage circuit. terminals are connected, the output terminal of the constant voltage charging circuit is connected to the first terminal of the third controlled switch; the input terminal of the constant temperature charging circuit is connected to the output terminal of the reference voltage circuit, the constant temperature charging circuit The output terminal is connected to the first terminal of the fourth controlled switch. 2. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the reference voltage output by the reference voltage circuit can be one channel, or can be greater than one channel, and the output voltage value of each channel is different, that is, a constant current The reference voltage connected to the charging circuit, charging termination circuit, power supply adaptive charging control circuit, trickle charging circuit, constant voltage charging circuit and constant current charging circuit may be the same voltage value, or may not be all the same voltage value. Or completely different voltage values. When they are different voltage values, they can be obtained through different output terminals of the reference voltage circuit. 3. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the constant current charging circuit completes the constant current charging control of the lithium battery in the lithium battery constant current charging stage; in other stages, Together with the charge termination circuit, power supply adaptive charging control circuit, trickle charging circuit, constant voltage charging circuit or constant temperature charging circuit, respectively, the trickle charging, constant voltage charging, constant temperature charging, power supply adaptive charging or Charging is terminated; the constant current charging state means that when the lithium battery voltage is in a certain voltage range, the lithium battery is charged with a certain constant current. 4. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the battery voltage sampling network is used to detect the voltage value at both ends of the lithium battery, and divide the lithium battery voltage value or the lithium battery voltage into The voltage value is fed back to the charge termination circuit, trickle charging circuit and constant voltage charging circuit. 5. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the charging termination circuit samples the size of the charging current or compares the voltage fed back by the battery voltage sampling network with the size of the reference voltage. Complete the charge termination control of the lithium battery. When the charging current is less than a certain value, or when the lithium battery voltage is higher than a certain value, the charge termination circuit ends the charging of the lithium battery by controlling the constant current charging circuit; when the power supply automatically When the adaptive charging control circuit controls the operation of the charging circuit, the charging termination circuit terminates charging through voltage sampling; when the power adaptive charging control circuit does not control the operation of the charging circuit, the charging termination circuit terminates charging through current sampling. 6. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the power supply voltage sampling network is used to detect the voltage value at both ends of the power supply and feed back the power supply voltage value or the divided voltage value of the power supply voltage. Adaptive charging control circuit to the power supply. 7. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the power supply adaptive charging control circuit compares the voltage value fed back by the power supply voltage sampling network with the size of the reference voltage. When the power supply When the voltage is higher than a certain voltage value, the first controlled switch is controlled to close so that the constant current charging circuit is not controlled by the power supply adaptive charging control circuit; when the power supply voltage is lower than a certain voltage value, the first controlled switch is controlled to close. A controlled switch is turned on so that the power supply adaptive charging control circuit controls the constant current charging circuit to be in the power supply adaptive charging state and no longer in the constant current charging state; the power supply adaptive charging state is when the current provided by the power supply is less than the constant current charging state. When charging current flows, the charging current is automatically adjusted according to the current provided by the power supply, so that the charging current adapts to the current provided by the power supply. 8. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the trickle charging circuit compares the voltage fed back by the battery voltage sampling network with the size of the reference voltage. When the lithium battery voltage is high, At a certain voltage value, the trickle charging circuit controls the second controlled switch to close, and the constant current charging circuit is not controlled by the trickle charging circuit; when the lithium battery voltage is lower than a certain voltage value , control the second controlled switch to turn on, so that the trickle charging circuit controls the constant current charging circuit to be in the trickle charging state and no longer in the constant current charging state; the trickle charging state means that the charging current is lower than the constant current charging state. Charging at a certain constant current value; in the trickle charging state, the charge termination circuit is controlled by the trickle charging circuit and has no effect. 9. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the constant voltage charging circuit compares the voltage fed back by the battery voltage sampling network with the size of the reference voltage. When the lithium battery voltage is low, At a certain voltage value, the constant voltage charging circuit controls the third controlled switch to close, and the constant current charging circuit is not controlled by the constant voltage charging circuit; when the lithium battery voltage is higher than a certain voltage value When, the constant voltage charging circuit controls the third controlled switch to open, so that the constant voltage charging circuit controls the constant current charging circuit to be in the constant voltage charging state and no longer in the constant current charging state; the constant voltage charging state It means that after the lithium battery voltage is higher than a certain voltage value, the charging voltage slowly increases or remains unchanged, so that the charging current gradually decreases from the original constant current charging current. 10. The power supply adaptive lithium battery charging management circuit according to claim 1, characterized in that: the constant temperature charging circuit determines the temperature by comparing the voltage generated by its internal temperature sensor with the reference voltage. When the temperature sensor When the induced temperature is lower than a certain temperature value, the constant temperature charging circuit controls the fourth controlled switch to close, and the constant current charging circuit is not controlled by the constant temperature charging circuit; when the temperature sensor sensed temperature is higher than a certain temperature value, the constant temperature charging circuit controls the fourth controlled switch to open, so that the constant temperature charging circuit controls the constant current charging circuit to be in a constant temperature charging state and no longer in a constant current charging state; the constant temperature charging state represents the temperature After the sensor sensing temperature is higher than a certain temperature value, the charging temperature remains constant, so that the charging current gradually decreases from the original constant current charging current.