Charging circuit

Abstract

The utility model relates to a charging circuit which comprises a power supply, the output end of the power supply is connected with the input end of an anti-reverse connection unit, the output end of the anti-reverse connection unit is connected with the input end of a delay starting unit, and the output end of the delay starting unit is connected with the input end of a voltage boosting unit. The output end of the voltage boosting unit is connected with the input end of the control input unit, the output end of the control input unit is connected with the input end of the battery charging unit, the output end of the battery charging unit is connected with the input end of the rechargeable battery pack, and the output end of the rechargeable battery pack is connected with the input end of the power switching unit. And the output end of the power supply switching unit is connected with the input end of external equipment. According to the utility model, charging efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of lithium battery charging in the new energy industry, relates to a charging circuit, and particularly relates to a charging circuit that supports wide-voltage power supply and can switch power sources. Background Art

[0002] Lithium batteries play an important role in the use of the new energy industry and belong to a kind of green energy. With the continuous development of modern industries, people's application demands for lithium battery products are becoming increasingly strong, and they can provide energy power support for various mobile devices. At present, the lithium battery industry involves multiple fields such as battery materials, battery manufacturing, and supporting charging equipment, and is a booming sunrise industry.

[0003] There are mainly two types of lithium battery charging devices on the market. One is to charge through an adapter that converts alternating current to direct current; the other is to charge the battery with a stable single direct current input.

[0004] Traditional lithium battery charging requires a power supply to provide a stable voltage, and then through a battery charging chip, constant current, constant voltage, and trickle charging are performed on the battery. The inability to use a wide voltage range for power supply limits the power-taking channels, thus making charging inconvenient.

[0005] Most traditional lithium battery charging schemes only support discharging the battery externally and do not support switching between external power supply and battery power supply. In this way, during the battery charging process, the device cannot be powered on or there will be a situation where the battery is charging and discharging simultaneously. When the discharging speed is greater than the charging speed, it will bring certain safety hazards, so it does not meet the use requirements in specific application scenarios.

[0006] In view of the above defects, the designer actively conducts research and innovation in order to create a charging circuit with a new structure, making it more valuable in the industry. Summary of the Utility Model

[0007] To solve the above technical problems, the purpose of the utility model is to provide a charging circuit.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A charging circuit includes a power supply. The output end of the power supply is connected to the input end of an anti-reverse connection unit. The output end of the anti-reverse connection unit is connected to the input end of a delay start unit. The output end of the delay start unit is connected to the input end of a voltage boost unit. The output end of the voltage boost unit is connected to the input end of a control input unit. The output end of the control input unit is connected to the input end of a battery charging unit (5). The output end of the battery charging unit is connected to the input end of a rechargeable battery pack. The output end of the rechargeable battery pack is connected to the input end of a power supply switching unit. The output end of the power supply switching unit is connected to the input end of an external device. The acquisition end of the rechargeable battery pack is connected to the input end of a voltage acquisition unit. The output end of the voltage acquisition unit is connected to the input end of a management unit. The output end of the management unit is connected to the input end of a charging status indication unit.

[0010] Preferably, in the charging circuit, the model of the chip used in the voltage boost unit is EG1164.

[0011] Preferably, in the charging circuit, the voltage output range of the voltage boost unit is DC10V - 26V.

[0012] Preferably, in the charging circuit, the model of the chip used in the battery charging unit is CN3705.

[0013] Preferably, in the charging circuit, the model of the chip used in the delay start unit is SE555D.

[0014] By means of the above solution, the present utility model has at least the following advantages:

[0015] The present utility model can be compatible with a charging circuit for charging at 10V and 26V, and is used to solve the problem of charging lithium battery devices using a vehicle cigarette lighter. At the same time, it can charge the same group of lithium batteries during charging at 10V or 26V, and automatically switch to the external power supply for power supply when charging with external power.

[0016] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it according to the content of the specification, the following takes the preferred embodiment of the present utility model and combines with the drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the accompanying drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] Figure 1 is the schematic diagram of the present utility model;

[0019] Figure 2 is the circuit diagram of the voltage boosting unit of the present utility model;

[0020] Figure 3 is the circuit diagram of the battery charging unit and the charging status indicating unit of the present utility model;

[0021] Figure 4 is the circuit diagram of the reverse connection prevention unit of the present utility model;

[0022] Figure 5 is the circuit diagram of the voltage acquisition unit of the present utility model;

[0023] Figure 6 is the circuit diagram of the power supply switching unit of the present utility model;

[0024] Figure 7 is the circuit diagram of the delay start unit of the present utility model;

[0025] Figure 8 is the circuit diagram of the control input unit of the present utility model. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0028] Embodiment

[0029] Such as Figures 1 to 8As shown in the figure, a charging circuit includes a power supply 1. The output end of the power supply 1 is connected to the input end of an anti-reverse connection unit 3. The output end of the anti-reverse connection unit 3 is connected to the input end of a delay start unit 6. The output end of the delay start unit 6 is connected to the input end of a voltage boost unit 2. The output end of the voltage boost unit 2 is connected to the input end of a control input unit 4. The output end of the control input unit 4 is connected to the input end of a battery charging unit 5. The output end of the battery charging unit 5 is connected to the input end of a rechargeable battery pack 7. The output end of the rechargeable battery pack 7 is connected to the input end of a power supply switching unit 8. The output end of the power supply switching unit 8 is connected to the input end of an external device 9. The acquisition end of the rechargeable battery pack 7 is connected to the input end of a voltage acquisition unit 10. The output end of the voltage acquisition unit 10 is connected to the input end of a management unit 12. The output end of the management unit 12 is connected to the input end of a charging state indication unit 11.

[0030] In the present utility model, the management unit is a processor, which can be one of the known CPU, MCU, DSP or ARM in the art.

[0031] As Figure 4 shown, the anti-reverse connection unit is implemented by using a MOS transistor, and even when the current is relatively large, it only generates a small amount of heat.

[0032] As Figure 2 shown, the auxiliary power supply of the voltage boost unit 2 uses an LDO power supply chip (EG1164) with a high input voltage to ensure that the input power supply can support a wide voltage range of input (i.e., the battery can be charged within the range of 10V to 26V).

[0033] As Figure 6 shown, for the power supply switching unit 8, when the battery is not being charged, the battery is used as a power supply providing device.

[0034] When the battery is charging, it is automatically switched to the external power supply through the power supply switching unit to supply power externally.

[0035] During the standby state of the device, the battery is charged. When the device starts to run, the battery charging is disconnected, and it is directly switched to the external power supply to supply power to the device.

[0036] As Figure 7 shown, for the delay start unit, among them, the model of the chip used in the delay start unit 6 is SE555D, which can effectively solve the electric spark caused when connecting to the external power supply for charging instantaneously, making the start of charging smoother.

[0037] As Figure 8As shown, the control input unit can automatically cut off the battery charging when the battery is in the charging state and when it is necessary to start the external device to run at this time, which can effectively eliminate the safety hazards brought by the continuous operation of a large current for both charging and external power supply.

[0038] As Figure 5 shown, the voltage acquisition unit divides the battery voltage and the external voltage through a circuit and outputs them to the terminal for the external device to read the battery voltage and the external voltage.

[0039] As Figure 3 shown, the model of the chip in the battery charging unit 5 is CN3705, and the charging state display unit can display the charging state of the battery in real time, enabling the user to intuitively know whether the current state of the battery is in the charging state.

[0040] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0043] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0044] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A charging circuit, comprising a power supply (1), characterized in that: The output terminal of the power supply (1) is connected to the input terminal of the reverse connection prevention unit (3), the output terminal of the reverse connection prevention unit (3) is connected to the input terminal of the delay start unit (6), the output terminal of the delay start unit (6) is connected to the input terminal of the voltage boost unit (2), the output terminal of the voltage boost unit (2) is connected to the input terminal of the control input unit (4), the output terminal of the control input unit (4) is connected to the input terminal of the battery charging unit (5), the output terminal of the battery charging unit (5) is connected to the input terminal of the rechargeable battery pack (7), the output terminal of the rechargeable battery pack (7) is connected to the input terminal of the power supply switching unit (8), the output terminal of the power supply switching unit (8) is connected to the input terminal of the external device (9), the acquisition terminal of the rechargeable battery pack (7) is connected to the input terminal of the voltage acquisition unit (10), the output terminal of the voltage acquisition unit (10) is connected to the input terminal of the management unit (12), and the output terminal of the management unit (12) is connected to the input terminal of the charging state indication unit (11).

2. The charging circuit according to claim 1, characterized in that: The model of the chip used in the voltage boost unit (2) is EG1164.

3. A charging circuit according to claim 1 or 2, characterized in that: The voltage output range of the voltage boost unit (2) is DC10V to 26V.

4. A charging circuit according to claim 1, characterized in that: The model of the chip used in the battery charging unit (5) is CN3705.

5. A charging circuit according to claim 1, characterized in that: The model of the chip used in the delay start unit (6) is SE555D.

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