Charging control circuit of solar charging equipment and solar charging equipment

Abstract

The utility model provides a solar energy charging equipment charging control circuit and solar energy charging equipment, the circuit comprises an MCU control circuit, a relay circuit, a solar energy photovoltaic panel and a storage battery pack, the storage battery pack comprises a plurality of storage batteries, the MCU control circuit is in control connection with the relay circuit, and the relay circuit is in control connection with the MCU control circuit. The relay circuit is electrically connected with the solar photovoltaic panel and a plurality of storage batteries in the storage battery pack, and the MCU control circuit is used for switching the current storage battery in a charging state to another storage battery for charging by controlling the working state of the relay circuit. According to the solar photovoltaic panel, multiple storage batteries in the storage battery pack can be charged at the same time, the problems that most of existing solar photovoltaic panels can only charge one storage battery, the charging efficiency is low, and a control circuit stops working when the storage battery is replaced are solved, the charging efficiency of the storage battery is improved to a great extent, and the solar energy utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar charging equipment charging control scheme design, in particular to a solar charging equipment charging control circuit and a solar charging equipment. Background Art

[0002] In recent years, solar energy has been widely used in industry, commerce, electronic consumer products and other fields.

[0003] The main components of current solar charging devices include: solar photovoltaic panels, batteries, and control circuits. Among them, the control circuit converts the unstable voltage output by the solar photovoltaic panel into the voltage level required by the battery, and realizes control protection and other functions. However, most existing solar photovoltaic panels can only charge one battery, with low charging efficiency, and when the battery is replaced, the control circuit will stop working, further reducing the charging efficiency and low energy utilization.

[0004] Therefore, the prior art needs to be further developed. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical deficiencies and provide a solar charging device charging control circuit and a solar charging device to solve the problems existing in the prior art.

[0006] In order to achieve the above technical objectives, according to the first aspect of the utility model, the utility model provides a charging control circuit for a solar charging device, comprising:

[0007] An MCU control circuit, a relay circuit, a solar photovoltaic panel and a battery pack, wherein the battery pack includes a plurality of batteries, the MCU control circuit and the relay circuit are controlled and connected, the relay circuit is electrically connected to the solar photovoltaic panel and the plurality of batteries in the battery pack respectively, and the MCU control circuit is used to switch the current battery in the charging state to another battery for charging by controlling the working state of the relay circuit.

[0008] Specifically, the circuit further includes:

[0009] A solar power supply circuit, the solar power supply circuit comprising a step-down circuit, a solar power supply voltage input terminal and a first voltage output terminal, the first voltage output terminal is used to output a first voltage, the step-down circuit comprises an input terminal and an output terminal, the solar power supply voltage input terminal is respectively electrically connected to the positive pole VCC_40 of the solar photovoltaic panel and the input terminal of the step-down circuit, and the output terminal of the step-down circuit is electrically connected to the first voltage output terminal.

[0010] Specifically, the circuit further includes:

[0011] A first voltage conversion circuit, wherein the first voltage conversion circuit includes a step-down chip, the step-down chip includes a first voltage input terminal and a second voltage output terminal, the second voltage output terminal is used to output a second voltage, the first voltage input terminal and the first voltage output terminal are electrically connected, the MCU control circuit includes an MCU control chip, the MCU control chip includes a second voltage input terminal, and the second voltage input terminal is electrically connected to the second voltage output terminal.

[0012] Specifically, the circuit further includes:

[0013] The second voltage conversion circuit includes a fixed voltage regulator chip, the fixed voltage regulator chip includes a second voltage input terminal and a third voltage output terminal, the second voltage input terminal is electrically connected to the second voltage output terminal, and the third voltage output terminal is used to output a third voltage.

[0014] Specifically, the MCU control chip also includes a first control signal output terminal, the relay circuit includes a relay chip, the relay chip includes a pair of control contacts, a pair of common contacts, a pair of normally open contacts and a pair of normally closed contacts, the battery pack includes a first battery and a second battery, the solar photovoltaic panel, the first battery and the second battery all include positive and negative poles, the pair of common contacts are respectively electrically connected to the positive pole VCC_40 and the negative pole of the solar photovoltaic panel, the pair of normally closed contacts are respectively electrically connected to the positive pole and the negative pole of the first battery, the pair of normally open contacts are respectively electrically connected to the positive pole and the negative pole of the second battery, and the pair of control contacts are respectively electrically connected to the first control signal output terminal and the first voltage output terminal.

[0015] Specifically, the MCU control chip also includes:

[0016] A first battery voltage detection signal input terminal and a second battery voltage detection signal input terminal, wherein the first battery voltage detection signal input terminal is electrically connected to the positive electrode of the first battery through a first voltage divider circuit, and the second battery voltage detection signal input terminal is electrically connected to the positive electrode of the second battery through a second voltage divider circuit.

[0017] Specifically, the circuit further includes:

[0018] A solar charging current detection circuit, wherein the solar charging current detection circuit comprises a current sensor chip, wherein the current sensor chip comprises a first sampling current positive terminal, a second sampling current positive terminal, a first sampling current negative terminal, a second sampling current negative terminal, and a charging current detection signal output terminal, wherein the MCU control chip further comprises a charging current detection signal input terminal, wherein the first sampling current positive terminal and the second sampling current positive terminal are both connected to the positive pole VCC_40 of the solar photovoltaic panel, the first sampling current negative terminal and the second sampling current negative terminal are both electrically connected to any one of a pair of common contacts, the charging current detection signal output terminal is electrically connected to the charging current detection signal input terminal, and the third voltage output terminal is also used to power the current sensor chip.

[0019] Specifically, the circuit further includes:

[0020] A battery power display circuit, the battery power display circuit includes an LED display screen driver chip, a first LED diode group and a second LED diode group, the MCU control circuit is controlled and connected to the LED display screen driver chip, the first LED diode group and the second LED diode group each include multiple LED diodes, the LED display screen driver chip includes multiple LED control signal output ends, the multiple LED control signal output ends are respectively electrically connected to the cathodes of the multiple LED diodes, the anodes of the multiple LED diodes are respectively electrically connected to the second voltage output end, and the MCU control circuit is used to display the power of the first battery or the second battery by controlling the number of diodes in the first LED diode group or the second LED diode group that are lit.

[0021] Specifically, the circuit further includes:

[0022] A battery working status display circuit, the battery working status display circuit includes a third LED diode, the MCU control chip also includes a second control signal output end, the anode of the third LED diode is electrically connected to the second voltage output end, and the cathode of the third LED diode is electrically connected to the second control signal output end.

[0023] According to a second aspect of the utility model, a solar charging device is provided, comprising:

[0024] The above-mentioned solar charging device charging control circuit.

[0025] Beneficial effects:

[0026] The utility model provides a charging control circuit of a solar charging device and a solar charging device, comprising an MCU control circuit, a relay circuit, a solar photovoltaic panel and a battery pack, wherein the battery pack comprises a plurality of batteries, the MCU control circuit and the relay circuit are controlled and connected, the relay circuit is electrically connected to the solar photovoltaic panel and the plurality of batteries in the battery pack respectively, the MCU control circuit is used for switching a current battery in a charging state to another battery for charging by controlling the working state of the relay circuit, since the relay is used for switching, the switching speed is very fast, the switching process will not interrupt the power-consuming equipment, so the switching process will not affect the normal operation of the equipment, and the simultaneous charging of a plurality of batteries in the battery pack can be realized, thus solving the problem that most of the existing solar photovoltaic panels can only charge one battery, the charging efficiency is low, and the control circuit will stop working when the battery is replaced, thus greatly improving the charging efficiency of the battery and improving the utilization rate of solar energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a circuit principle schematic diagram of the MCU control circuit provided in a specific embodiment of the utility model;

[0028] Figure 2 It is a circuit principle schematic diagram of a second voltage conversion circuit provided in a specific embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of the circuit principle of the solar power supply circuit provided in a specific embodiment of the utility model;

[0030] Figure 4 It is a circuit principle schematic diagram of a solar charging current detection circuit provided in a specific embodiment of the utility model;

[0031] Figure 5 It is a circuit principle diagram of a battery power display circuit provided in a specific embodiment of the utility model;

[0032] Figure 6 It is a circuit principle diagram of a battery working status display circuit provided in a specific embodiment of the utility model;

[0033] Figure 7 It is a circuit principle schematic diagram of a relay circuit provided in a specific embodiment of the utility model;

[0034] Figure 8 It is a circuit principle schematic diagram of the first voltage conversion circuit provided in a specific embodiment of the utility model. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the creation of the present invention.

[0036] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0037] See also Figure 1 The utility model provides a charging control circuit for a solar charging device, comprising:

[0038] An MCU control circuit, a relay circuit, a solar photovoltaic panel and a battery pack, wherein the battery pack includes a plurality of batteries, the MCU control circuit and the relay circuit are controlled and connected, the relay circuit is electrically connected to the solar photovoltaic panel and the plurality of batteries in the battery pack respectively, and the MCU control circuit is used to switch the current battery in the charging state to another battery for charging by controlling the working state of the relay circuit.

[0039] Specifically, the circuit further includes:

[0040] A solar power supply circuit, the solar power supply circuit comprising a step-down circuit, a solar power supply voltage input terminal and a first voltage output terminal VDD1, the first voltage output terminal VDD1 is used to output a first voltage, the step-down circuit comprises an input terminal and an output terminal, the solar power supply voltage input terminal is respectively electrically connected to the positive electrode VCC_40 of the solar photovoltaic panel and the input terminal of the step-down circuit, and the output terminal of the step-down circuit is electrically connected to the first voltage output terminal VDD1.

[0041] It should be noted here that the step-down circuit includes a twenty-first diode D21 and a twenty-second diode D22 connected in series, and the models of the twenty-first diode D21 and the twenty-second diode D22 are both voltage-stabilizing diodes 1SMA5916A.

[0042] It should be noted here that the range of the first voltage is [10, 28], in volts; due to the different light intensities during the day and at night, the voltage output by the solar photovoltaic panel is in the range of [0, 40], in volts.

[0043] Specifically, the circuit further includes:

[0044] A first voltage conversion circuit, the first voltage conversion circuit includes a buck chip U6, the buck chip U6 includes a first voltage input terminal VIN and a second voltage output terminal SW, the second voltage output terminal SW is used to output a second voltage, the first voltage input terminal VIN is electrically connected to the first voltage output terminal VDD1, the MCU control circuit includes an MCU control chip, the MCU control chip includes a second voltage input terminal VDD, and the second voltage input terminal VDD is electrically connected to the second voltage output terminal VCC.

[0045] It should be noted here that the second voltage is 5V, the model of the step-down chip U6 is RY8401, and the model of the MCU control chip is MM32F0020.

[0046] Specifically, the circuit further includes:

[0047] The second voltage conversion circuit includes a fixed voltage regulator chip U5, and the fixed voltage regulator chip U5 includes a second voltage input terminal IN and a third voltage output terminal OUT. The second voltage input terminal IN is electrically connected to the second voltage output terminal VCC, and the third voltage output terminal OUT is used to output a third voltage, and the third voltage is 3.3V.

[0048] It should be noted here that the model of the fixed voltage regulator chip U5 is LP5907.

[0049] Specifically, the MCU control chip also includes a first control signal output terminal CT2, the relay circuit includes a relay chip J1, the relay chip J1 includes a pair of control contacts (contact 0 and contact 1), a pair of common contacts (contact 4 and contact 5), a pair of normally open contacts (contact 6 and contact 7) and a pair of normally closed contacts (contact 2 and contact 3), the battery pack includes a first battery BATTERY1 and a second battery BATTERY2, the solar photovoltaic panel, the first battery BATTERY1 and the second battery BATTERY2 all include positive and negative poles, the pair of common contacts are respectively electrically connected to the positive pole VCC_40 and the negative pole VCC_40- of the solar photovoltaic panel, the pair of normally closed contacts are respectively electrically connected to the positive pole and the negative pole of the first battery BATTERY1, the pair of normally open contacts are respectively electrically connected to the positive pole and the negative pole of the second battery BATTERY2, and the pair of control contacts are respectively electrically connected to the first control signal output terminal CT2 and the first voltage output terminal VDD1.

[0050] Specifically, the MCU control chip also includes:

[0051] and a first battery voltage detection signal input terminal PA11 and a second battery voltage detection signal input terminal PA2, wherein the first battery voltage detection signal input terminal PA11 is electrically connected to the positive electrode of the first battery BATTERY1 through a first voltage divider circuit, and the second battery voltage detection signal input terminal PA2 is electrically connected to the positive electrode of the second battery BATTERY2 through a second voltage divider circuit.

[0052] It should be noted that the first voltage-dividing circuit includes a resistor Rb1t (with a resistance of 100K) and a resistor Rb1b (a 10K resistor), and the second voltage-dividing circuit includes a resistor Rb2t (with a resistance of 100K) and a resistor Rb2b (with a resistance of 10K).

[0053] Specifically, the circuit further includes:

[0054] A solar charging current detection circuit, the solar charging current detection circuit includes a current sensor chip U2, the current sensor chip U2 includes a first sampling current positive terminal (pin 1), a second sampling current positive terminal (pin 2), a first sampling current negative terminal (pin 3), a second sampling current negative terminal (pin 4), and a charging current detection signal output terminal (pin 7), the MCU control chip also includes a charging current detection signal input terminal (pin PA15), the first sampling current positive terminal (pin 1) and the second sampling current positive terminal (pin 2) are both connected to the positive pole VCC_40 of the solar photovoltaic panel, the first sampling current negative terminal (pin 3) and the second sampling current negative terminal (pin 4) are both electrically connected to any one of a pair of common contacts, the charging current detection signal output terminal (pin 7) and the charging current detection signal input terminal (pin PA15) are electrically connected, and the third voltage output terminal is also used to power the current sensor chip U2.

[0055] It should be noted here that the model of the current sensor chip U2 is CC6904.

[0056] Specifically, the circuit further includes:

[0057] A battery power display circuit, the battery power display circuit includes an LED display driver chip U3, a first LED diode group and a second LED diode group, the MCU control circuit and the LED display driver chip U3 are controlled and connected, the first LED diode group and the second LED diode group each include multiple LED diodes, the LED display driver chip includes multiple LED control signal output ends, the multiple LED control signal output ends are respectively electrically connected to the negative poles of the multiple LED diodes, and the positive poles of the multiple LED diodes are respectively electrically connected to the second voltage output end, the MCU control circuit is used to display the power of the first battery BATTERY1 or the second battery BATTERY2 by controlling the number of diodes in the first LED diode group or the second LED diode group that are lit.

[0058] It should be noted here that the model of the LED display screen driver chip U3 is MBI5124.

[0059] It should be noted here that, preferably, the number of diodes in the first LED diode group and the first LED diode group of the utility model are both 4, wherein the first LED diode group includes LED diodes VD1-VD4, and the second LED diode group includes LED diodes VD5-VD8. It can be understood that in the utility model, the LED diodes in the first LED diode group or the second LED diode group are separated and arranged on both sides of the same surface of the solar charging device casing, so as to be able to intuitively display the power of the first battery BATTERY1 and the second battery BATTERY2 respectively.

[0060] Specifically, the circuit further includes:

[0061] A battery working status display circuit, the battery working status display circuit includes a third LED diode ON1, the MCU control chip also includes a second control signal output terminal CT1, the anode of the third LED diode ON1 is electrically connected to the second voltage output terminal, and the cathode of the third LED diode ON1 is electrically connected to the second control signal output terminal CT1.

[0062] It should be noted here that the working control process of the third LED diode ON1 is to control the working state of the third LED diode ON1 by controlling the electrical level of the second control signal output terminal CT1, so as to indicate whether the first battery BATTERY1 is in working state or the second battery BATTERY2 is in working state, so as to facilitate the staff to disassemble and replace the battery, thereby further improving the usability and convenience of the utility model.

[0063] It is understandable that the following examples illustrate the use of the present invention:

[0064] See also Figure 1 This figure is the MCU control circuit diagram. The P0 interface in the lower right corner includes four network numbers: VCC, SWDIO, SWCLK, and GND, which are connected to the microcontroller. It is the program download circuit of the microcontroller.

[0065] The VCC connected in the lower left corner is a 5V power supply.

[0066] VCCB1 is the positive electrode of the first battery connected. After passing through Rb1t (100K resistor) and Rb1b (10K resistor), VCCB1 (voltage range is 21V-29.2V) is divided by 1 / 11 to the range of 1.9V-2.65V, so that the MCU control chip can detect the battery power;

[0067] VCCB2 is the positive electrode of the second battery. After passing through Rb2t (100K resistor) and Rb2b (10K resistor), VCCB2 (voltage range is 21V-29.2V) is divided by 1 / 11 to the range of 1.9V-2.65V, so that the MCU control chip can detect the battery power.

[0068] The CPU nodes are connected to Figure 4 The MCU control chip can detect the current charging current by detecting the signal of the current detection circuit;

[0069] The four network numbers DATA, SCK, LATCH and EN represent Figure 5 The chip U3 of the battery power display circuit is connected to control and display the battery power.

[0070] CT1 and Figure 6 The circuit connection in shows whether the battery currently connected to the solar photovoltaic panel is the first battery. If the battery currently connected is the first battery, the ON1 indicator light is on, if not, the ON1 indicator light is off.

[0071] CT2 and Figure 7 The circuit connection in controls the relay state, switching the current working battery.

[0072] See also Figure 2 , this circuit is used to convert the VCC (5V) voltage to VCC3.3 (3.3V) voltage.

[0073] See also Figure 3, where the GF terminal is connected to the solar photovoltaic panel, the A terminal is connected to the positive pole, the K terminal is connected to the negative pole, and its voltage range is less than 40V, which is about 36V in the daytime power generation state and 0V in the night when it is not generating power; the BATTERY1 terminal is connected to the lithium battery 1, the A terminal is connected to the positive pole, the voltage range is 21V~29.2V, and the B terminal is connected to the negative pole ground terminal; the BATTERY2 terminal is connected to the lithium battery 2, the A terminal is connected to the positive pole, the voltage range is 21V~29.2V, and the B terminal is connected to the negative pole ground terminal; these three parts are all prevented from being directly connected to each other through diodes D4, D1, and D2, and can be converted into VDD1 (voltage range is 10-28V) after being stepped down by the voltage-stabilizing diodes D21 and D22 at the same time to power the MCU control circuit. The circuit can ensure the normal operation of the MCU control circuit when any one or more of the three power sources are powered, solving the problems that most existing solar photovoltaic panels can only charge one battery, have low charging efficiency, and the control circuit stops working when the battery is replaced. It greatly improves the charging efficiency of the battery and improves the utilization rate of solar energy.

[0074] See also Figure 4 According to the different currents flowing through chip U2, CUP outputs different voltage signals for detection by the MCU control chip.

[0075] See also Figure 5 , VD1-VD8 on the right are 8 LED indicator lights, among which VD1-VD4 display the power of the first battery, and VD5-VD8 display the power of the second battery.

[0076] See also Figure 6 When the first battery is in working condition, the ON1 indicator light is on; otherwise it is off.

[0077] Please refer to Figure 7, in which contacts 2 and 3 are always connected, contacts 4 and 5 are always connected, and contacts 6 and 7 are always connected; in the absence of any control, the relay's (contacts 4 and 5) and (contacts 2 and 3) are connected by default, that is, the solar energy and the first battery are connected when the power is off; under the action of the control circuit, the CT2 control signal controls the conduction of Q01 on the right side, and Q01 will attract a pair of control contacts of the relay, and then the relay (contacts 4 and 5) will be connected to (contacts 6 and 7), so that the first battery can be disconnected and the second battery can be put into working state; and the indicator light ON2 is turned on and becomes bright, thereby indicating whether the battery currently in working state is the first battery or the second battery, which greatly facilitates the staff to observe, disassemble and replace the battery, and greatly improves the convenience and usability of the utility model.

[0078] See also Figure 8 This circuit is used to convert the VDD1 voltage (voltage range is 10-28V) into the VCC voltage (voltage is 5V) for use by the MCU control circuit.

[0079] In other preferred embodiments, the control circuit can detect the power levels of the two batteries, detect the solar charging current, and select which battery to discharge.

[0080] The following examples illustrate the application scenarios of the present utility model. The examples are intended to illustrate the conventional application methods of the present utility model. The methods, programs and software designs involved do not fall within the scope of protection of the present utility model:

[0081] The MCU control circuit first samples and measures the voltage of the two batteries, and can detect the difference in the amount of the two batteries, and detect the current charging current at the same time. If the voltage difference between the two batteries is less than 0.4V, the battery will not be switched. If the current battery voltage is higher than the other battery by 0.4, and the charging current is greater than 0.5A, it will switch to the other battery to charge the other battery; if the continuous charging state is good, the two batteries will be slowly filled; if the charging current is less than 0, and the current working battery voltage is lower than the other battery by 0.4V, the battery will be switched to adjust the other battery to the working state; this can extend the working time. Since the relay is used for switching, the switching speed is very fast, and the switching process will not interrupt the electrical equipment, so the switching process will not affect the normal operation of the equipment.

[0082] If the weather is bad for a long time and the solar power is insufficient, you can directly remove one battery and charge it with a charger. At this time, the controller will automatically switch to another battery. After this battery is fully charged, you can directly connect the fully charged battery to the circuit. The MCU control circuit will reselect the working battery according to the battery power difference. At this time, you can also remove the other battery and charge it with a charger.

[0083] It can be understood that the utility model provides a charging control circuit of a solar charging device and a solar charging device, including an MCU control circuit, a relay circuit, a solar photovoltaic panel and a battery pack, wherein the battery pack includes multiple batteries, the MCU control circuit and the relay circuit are controlled and connected, the relay circuit is electrically connected to the solar photovoltaic panel and the multiple batteries in the battery pack respectively, and the MCU control circuit is used to control the working state of the relay circuit, thereby switching the current battery in the charging state to another battery for charging. Since the relay is used for switching, the switching speed is very fast, and the switching process will not interrupt the electrical equipment, so the switching process will not affect the normal operation of the equipment, and the simultaneous charging of multiple batteries in the battery pack can be realized, which solves the problem that most of the existing solar photovoltaic panels can only charge one battery, the charging efficiency is low, and the control circuit will stop working when the battery is replaced, which greatly improves the charging efficiency of the battery and improves the utilization rate of solar energy.

[0084] The utility model provides another embodiment, which provides a solar charging device, the solar charging device comprising:

[0085] The above-mentioned solar charging device charging control circuit.

[0086] It can be understood that the utility model provides a charging control circuit of a solar charging device and a solar charging device, including an MCU control circuit, a relay circuit, a solar photovoltaic panel and a battery pack, wherein the battery pack includes multiple batteries, the MCU control circuit and the relay circuit are controlled and connected, the relay circuit is electrically connected to the solar photovoltaic panel and the multiple batteries in the battery pack respectively, and the MCU control circuit is used to control the working state of the relay circuit, thereby switching the current battery in the charging state to another battery for charging. Since the relay is used for switching, the switching speed is very fast, and the switching process will not interrupt the electrical equipment, so the switching process will not affect the normal operation of the equipment, and the simultaneous charging of multiple batteries in the battery pack can be realized, which solves the problem that most of the existing solar photovoltaic panels can only charge one battery, the charging efficiency is low, and the control circuit will stop working when the battery is replaced, which greatly improves the charging efficiency of the battery and improves the utilization rate of solar energy.

[0087] The various technical features described above can be combined arbitrarily. Although all possible combinations of these technical features are not described, any combination of these technical features should be considered to be covered by this specification as long as there is no contradiction in such combination.

[0088] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A solar charging device charging control circuit, characterized in that: The circuit comprises: An MCU control circuit, a relay circuit, a solar photovoltaic panel and a battery pack, wherein the battery pack includes a plurality of batteries, the MCU control circuit and the relay circuit are controlled and connected, the relay circuit is electrically connected to the solar photovoltaic panel and the plurality of batteries in the battery pack respectively, and the MCU control circuit is used to switch the current battery in the charging state to another battery for charging by controlling the working state of the relay circuit.

2. The solar charging device charging control circuit according to claim 1, characterized in that: The circuit further comprises: A solar power supply circuit, the solar power supply circuit comprising a step-down circuit, a solar power supply voltage input terminal and a first voltage output terminal, the first voltage output terminal is used to output a first voltage, the step-down circuit comprises an input terminal and an output terminal, the solar power supply voltage input terminal is respectively electrically connected to the positive pole VCC_40 of the solar photovoltaic panel and the input terminal of the step-down circuit, and the output terminal of the step-down circuit is electrically connected to the first voltage output terminal.

3. The solar charging device charging control circuit according to claim 2, characterized in that: The circuit further comprises: A first voltage conversion circuit, wherein the first voltage conversion circuit includes a step-down chip, the step-down chip includes a first voltage input terminal and a second voltage output terminal, the second voltage output terminal is used to output a second voltage, the first voltage input terminal and the first voltage output terminal are electrically connected, the MCU control circuit includes an MCU control chip, the MCU control chip includes a second voltage input terminal, and the second voltage input terminal is electrically connected to the second voltage output terminal.

4. The solar charging device charging control circuit according to claim 3, characterized in that: The circuit further comprises: The second voltage conversion circuit includes a fixed voltage regulator chip, the fixed voltage regulator chip includes a second voltage input terminal and a third voltage output terminal, the second voltage input terminal is electrically connected to the second voltage output terminal, and the third voltage output terminal is used to output a third voltage.

5. The solar charging device charging control circuit according to claim 4, characterized in that: The MCU control chip also includes a first control signal output terminal, the relay circuit includes a relay chip, the relay chip includes a pair of control contacts, a pair of common contacts, a pair of normally open contacts and a pair of normally closed contacts, the battery pack includes a first battery and a second battery, the solar photovoltaic panel, the first battery and the second battery all include positive and negative poles, the pair of common contacts are respectively electrically connected to the positive pole VCC_40 and the negative pole of the solar photovoltaic panel, the pair of normally closed contacts are respectively electrically connected to the positive pole and the negative pole of the first battery, the pair of normally open contacts are respectively electrically connected to the positive pole and the negative pole of the second battery, and the pair of control contacts are respectively electrically connected to the first control signal output terminal and the first voltage output terminal.

6. The solar charging device charging control circuit according to claim 5, characterized in that: The MCU control chip also includes: A first battery voltage detection signal input terminal and a second battery voltage detection signal input terminal, wherein the first battery voltage detection signal input terminal is electrically connected to the positive electrode of the first battery through a first voltage divider circuit, and the second battery voltage detection signal input terminal is electrically connected to the positive electrode of the second battery through a second voltage divider circuit.

7. The solar charging device charging control circuit according to claim 6, characterized in that: The circuit further comprises: A solar charging current detection circuit, wherein the solar charging current detection circuit comprises a current sensor chip, wherein the current sensor chip comprises a first sampling current positive terminal, a second sampling current positive terminal, a first sampling current negative terminal, a second sampling current negative terminal, and a charging current detection signal output terminal, wherein the MCU control chip further comprises a charging current detection signal input terminal, wherein the first sampling current positive terminal and the second sampling current positive terminal are both connected to the positive pole VCC_40 of the solar photovoltaic panel, the first sampling current negative terminal and the second sampling current negative terminal are both electrically connected to any one of a pair of common contacts, the charging current detection signal output terminal is electrically connected to the charging current detection signal input terminal, and the third voltage output terminal is also used to power the current sensor chip.

8. The solar charging device charging control circuit according to claim 7, characterized in that: The circuit further comprises: A battery power display circuit, the battery power display circuit includes an LED display screen driver chip, a first LED diode group and a second LED diode group, the MCU control circuit is controlled and connected to the LED display screen driver chip, the first LED diode group and the second LED diode group each include multiple LED diodes, the LED display screen driver chip includes multiple LED control signal output ends, the multiple LED control signal output ends are respectively electrically connected to the cathodes of the multiple LED diodes, the anodes of the multiple LED diodes are respectively electrically connected to the second voltage output end, and the MCU control circuit is used to display the power of the first battery or the second battery by controlling the number of diodes in the first LED diode group or the second LED diode group that are lit.

9. The solar charging device charging control circuit according to claim 8, characterized in that: The circuit further comprises: A battery working status display circuit, the battery working status display circuit includes a third LED diode, the MCU control chip also includes a second control signal output end, the anode of the third LED diode is electrically connected to the second voltage output end, and the cathode of the third LED diode is electrically connected to the second control signal output end.

10. A solar charging device, characterized in that: A solar charging device charging control circuit as described in any one of claims 1 to 9 is adopted.

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