Battery control circuit for charging from 18V to 3.2 V of solar panel

Abstract

The utility model discloses a battery control circuit for charging a solar panel from 18V to 3.2 V, which is arranged between the solar panel and a rechargeable battery and comprises a charging control circuit and an MCU (Microprogrammed Control Unit) main control circuit connected with the charging control circuit, the charging control circuit comprises a first MOS tube, a second MOS tube, an inductor, a fifth resistor, a fifteenth resistor, a third triode, a fourth triode, a third resistor, an eighth resistor, a fifth triode, a fourth resistor, a second unilateral diode and a sixth capacitor. According to the utility model, the structure setting is reasonable, the circuit structure setting is reasonable, the processing cost is reduced, the MCU main control circuit is used for controlling, the control effectiveness and the control precision are improved, and the applicability is strong.

Description

Technical Field

[0001] This utility model belongs to the field of solar energy technology, specifically relating to a control circuit for charging a 3.2V battery from an 18V solar panel. Background Technology

[0002] Solar energy is a renewable energy source, and solar panels are a common structure that utilizes solar energy. They can effectively convert solar energy into electrical energy and are generally used in conjunction with batteries. When there is sunlight, the solar panels generate electricity and charge the batteries or directly power electrical appliances. Therefore, a corresponding charging control module is required when using them. Existing solar charging control modules are not only very complex in structure, but also have poor control stability, which to some extent affects their applicability. Summary of the Invention

[0003] The purpose of this invention is to provide a control circuit for charging a 3.2V battery from an 18V solar panel, which has a reasonable structure and is conducive to improving control stability.

[0004] The technical solution to achieve the purpose of this utility model is a control circuit for charging a 3.2V battery from an 18V solar panel, which is set between the solar panel and the rechargeable battery, including a charging control circuit and an MCU main control circuit connected to the charging control circuit;

[0005] The charging control circuit includes a first MOSFET, a second MOSFET, an inductor, a fifth resistor, a fifteenth resistor, a third transistor, a fourth transistor, a third resistor, an eighth resistor, a fifth transistor, a fourth resistor, a second unidirectional diode, and a sixth capacitor.

[0006] The drain of the first MOSFET is connected to the solar panel, and its source is connected to the source of the second MOSFET. The drain of the second MOSFET is connected to an inductor, and the other end of the inductor is connected to a rechargeable battery.

[0007] The fourth resistor and the sixth capacitor are connected in parallel, with one end connected to the pin of the MCU main control circuit and the other end connected to the base of the third transistor. The third resistor and the eighth resistor are connected in series, with one end connected to the collector of the third transistor and the other end connected to the base of the fifth transistor and the fourth transistor.

[0008] The gate of the first MOS transistor is connected to the emitters of the fifth and fourth transistors;

[0009] The collector of the fifth transistor is connected to the negative terminal of the solar panel;

[0010] The fifth and fifteenth resistors are connected in series, with one end connected to the collector of the fourth transistor and the other end connected to the gate of the second MOSFET.

[0011] The positive terminal of the second unidirectional diode is connected to the gate of the second MOSFET, and the negative terminal is connected to the junction of the third resistor and the eighth resistor.

[0012] A further preferred embodiment is that the third and fourth transistors are both NPN transistors, and the fifth transistor is a PNP transistor.

[0013] A further preferred embodiment is that both the first MOS transistor and the second MOS transistor are P-MOS transistors.

[0014] This utility model has positive effects: its structure is reasonable, not only is its circuit structure reasonable, which helps to reduce processing costs, but it is also controlled by an MCU main control circuit, which helps to improve the effectiveness and accuracy of control, and has strong applicability. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0016] Figure 1 This is a schematic diagram of the specific circuit of this utility model.

[0017] Figure labels: 1. Charging control circuit; 2. MCU main control circuit. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0019] See Figure 1As shown, a control circuit for charging a 3.2V battery from an 18V solar panel is disposed between the solar panel and the rechargeable battery. It includes a charging control circuit 1 and an MCU main control circuit 2 connected to the charging control circuit. In this embodiment, the charging control circuit includes a first MOSFET Q1, a second MOSFET Q2, an inductor L1, a fifth resistor R5, a fifteenth resistor R15, a third transistor Q3, a fourth transistor Q4, a third resistor R3, an eighth resistor R8, a fifth transistor Q5, a fourth resistor R4, a second unidirectional diode D2, and a sixth capacitor C6. During assembly, the drain of the first MOSFET is connected to the solar panel, and its source is connected to the source of the second MOSFET. The drain of the second MOSFET is connected to the inductor, and the other end of the inductor is connected to the rechargeable battery. The fourth resistor and the sixth capacitor are connected in parallel, with one end connected to a pin of the MCU main control circuit and the other end connected to the base of the third transistor. The resistor and the eighth resistor are connected in series, with one end connected to the collector of the third transistor and the other end connected to the base of the fifth and fourth transistors; the gate of the first MOSFET is connected to the emitter of the fifth and fourth transistors; the collector of the fifth transistor is connected to the negative terminal of the solar panel; the fifth resistor and the fifteenth resistor are connected in series, with one end connected to the collector of the fourth transistor and the other end connected to the gate of the second MOSFET; the anode of the second unidirectional diode is connected to the gate of the second MOSFET, and the cathode is connected to the junction of the third and eighth resistors.

[0020] Furthermore, in this embodiment, the third and fourth transistors are both NPN transistors, and the fifth transistor is a PNP transistor. The first and second MOS transistors are both P-MOS transistors.

[0021] This utility model has positive effects: its structure is reasonable, not only is its circuit structure reasonable, which helps to reduce processing costs, but it is also controlled by an MCU main control circuit, which helps to improve the effectiveness and accuracy of control, and has strong applicability.

[0022] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0023] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A solar panel 18V charging 3.2V battery control circuit, disposed between the solar panel and the charging battery, characterized in that: The application relates to a solar charging control circuit, which comprises a charging control circuit and an MCU master control circuit connected with the charging control circuit. The charging control circuit comprises a first MOS transistor, a second MOS transistor, an inductor, a fifth resistor, a fifteenth resistor, a third triode, a fourth triode, a third resistor, an eighth resistor, a fifth triode, a fourth resistor, a second unidirectional diode and a sixth capacitor. The drain of the first MOS transistor is connected to a solar panel, and the source is connected to the source of the second MOS transistor; the drain of the second MOS transistor is connected to the inductor, and the other end of the inductor is connected to a charging battery. The fourth resistor and the sixth capacitor are connected in parallel, one end of which is connected to the pin of the MCU master control circuit and the other end is connected to the base of the third triode; the third resistor and the eighth resistor are connected in series, one end of which is connected to the collector of the third triode and the other end is connected to the base of the fifth triode and the fourth triode; The gate of the first MOS transistor is connected to the emitter of the fifth triode and the fourth triode; The collector of the fifth triode is connected to the negative electrode of the solar panel; The fifth resistor and the fifteenth resistor are connected in series, one end of which is connected to the collector of the fourth triode and the other end is connected to the gate of the second MOS transistor; The positive electrode of the second unidirectional diode is connected to the gate of the second MOS transistor, and the negative electrode is connected to the connection point of the third resistor and the eighth resistor.

2. A solar panel 18V charging 3.2V battery control circuit according to claim 1, characterized by: The third triode and the fourth triode are both NPN triodes, and the fifth triode is a PNP triode.

3. A solar panel 18V charging 3.2V battery control circuit according to claim 2, characterized by: The first MOS transistor and the second MOS transistor are both P-MOS transistors.

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